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HomeMy WebLinkAboutPermit L98-0034 - HIGHLINE WATER DISTRICT - UNCLASSIFIED USE This record contains information which is exempt from public disclosure pursuant to the Washington State Public Records Act, Chapter 42.56 RCW as identified on the Digital Records Exemption Log shown below. L98-0034 HIGHLINE WATER DISTRICT UNCLASSIFIED USE ND 16200 42 AVENUE SOUTH DIGITAL RECORDS (DR) EXEMPTION LOG THE ABOVE MENTIONED PERMIT FILE INCLUDES THE FOLLOWING REDACTED INFORMATION Page # Code Exemption Brief Explanatory Description Statute/Rul e The Privacy Act of 1974 evinces Congress' intent that social security numbers are a private concern. As such, individuals’ social security Personal Information – numbers are redacted to protect those individuals’ Social Security Numbers 5 U.S.C. sec. privacy pursuant to 5 U.S.C. sec. 552(a), and are DR1 Generally – 552(a); RCW also exempt from disclosure under section 42.56.070(1) 5 U.S.C. sec. 552(a); 42.56.070(1) of the Washington State Public RCW 42.56.070(1) Records Act, which exempts under the PRA records or information exempt or prohibited from disclosure under any other statute. Redactions contain Credit card numbers, debit card numbers, electronic check numbers, credit Personal Information – expiration dates, or bank or other financial RCW DR2 Financial Information – account numbers, which are exempt from 42.56.230(5) disclosure pursuant to RCW 42.56.230(5) except RCW 42.56.230(4 5) , when disclosure is expressly required by or governed by other law. Redactions contain information used to prove Personal Information – RCW identity, age, residential address, social security DR3 Driver’s License. – 42.56.230 number or other personal information required to (7a & c) RCW 42.56.230 (7a & c) apply for a driver’s license or identicard. Redacted content contains a communication between client and attorney for the purpose of 125, 126, 127 obtaining or providing legal advice exempt from RCW Attorney-Client Privilege – disclosure pursuant to RCW 5.60.060(2)(a), 5.60.060(2) DR4 RCW 5.60.060(2)(a); *Staff Note: An unredacted which protects attorney-client privileged (a); RCW RCW 42.56.070(1) copy of these pages from the communications, and RCW 42.56.070(1), which 42.56.070(1) record is available in the protects, under the PRA, information exempt or Staff-only portal.* prohibited from disclosure under another statute. L98 -0034 HIGHLINE WATER DISTRICT 16200 42 °d Ave. S CLASSIFIED USE) , MEMORANDUM Date: March 19, 1999 To: Mr. Don Williams Parks Director, City of Tukwila From: Keith Harris Manager, Planning /Construction Re: Project 96 -3 / Crestview School Site Agreement :A':Y..VoZ. MerfaV%Y:A!W 1,1M..,4 IJJYt: oe. 11 4e:A rA T' Y:<.! J:. 01. TIV r: i!: Yh9.:!': 717/ A': C. 61. 7/. Y: N' Jia!// Y. Yo w/. Y.: O,_ M /l /.4,War/d.:r'/,WWLIZ.OIrAnb:I A/tfitl'Y. %:I /AVSi0I:' /Y.Oi1 %."05:.VA Don: I am attaching the third -party agreement, which was signed last fall which outlines the development of the Crestview Elementary School site. Please refer to this document when considering obligations of the Highline Water District. I suggest that we meet and discuss the various implications of the existing document and the proposed document. These documents should not contradict each other. Please contact me about a meeting time. z . • _I u 6D; J U' 0 O; Cri 0' cnw, w =: 'w0'. w Z Z ww C.) N' w C. H. O; !ui Z'' w. Recording Requested By and When Recorded Mail To: Snure Law Office A Professional Service Corporation 22513 Marine View Drive, Suite 201 Des Moines, WA 98198 -6836 AGREEMENT AND EASEMENT FOR WATER RESERVOIR 9812313023 (3?-0-7 GRANTOR: Highline School District No. 401, a municipal corporation GRANTEE: Highline Water District, a municipal corporation Legal Description (Abbreviated): Ptn NW 1/4 Sec 27, Twn 23 N, R 4 E, full legal on pages 14, 16 & 17 Assessor's Tax Parcel ID #: 537980 - 0008 -07 Reference No. of Documents Released or Assigned: N/A • Mlle 5d O?A 5810034 i iUi103 9NI)i l!d OOIOPEO EZOE- TE3186 W 6 JU; U0 rn '. CO OF ' =, N w. w C gni w Q; = cy 1-.111; Z 0,: •Z w W ;0 N` w w; —O iii ; 9812313023 AGREEMENT AND EASEMENT FOR WATER RESERVOIR This Agreement is entered into between HIGHLINE SCHOOL DISTRICT NO. 401, a municipal corporation organized and existing under the laws of the State of Washington, hereafter referred to as "HSD," and HIGHLINE WATER DISTRICT, a municipal corporation organized and existing under the laws of the State of Washington, hereafter referred to as "HWD." While not a party to the Easement Agreement,. THE CITY OF TUKWILA, a municipal corporation organized and existing under the laws of the State of Washington, hereafter referred to as "Tukwila" has approved the contents of the Agreement as it affects its leasehold interests described below and signs below to indicate such approval. RECITALS 1. HSD is the owner of an approximately 10.9 acre parcel of real property legally described in Exhibit A, attached hereto and incorporated by this reference (hereafter referred to as the "Crestview Site "). The Crestview Site is partially developed with a City of Tukwila Park and a vacated elementary school. 2. Tukwila is the Lessee of a portion of the Crestview Site, legally described in Exhibit B, attached hereto and incorporated by this reference (hereafter referred to as the "Leased Premises "). 3. HWD intends to construct, operate and maintain an underground water reservoir with an approximate capacity of 7.6 million gallons, together with all necessary facilities, equipment and utilities, on the Northwest portion of the Crestview Site (hereafter referred to as the "Reservoir "). 4. The parties acknowledge that this Agreement is entered into pursuant to Chapter 39.34 RCW, the Interlocal Cooperation Act. AGREEMENT In consideration of the mutual promises contained in this Agreement, HSD hereby conveys and quitclaims to HWD the easements identified in Exhibit C, attached hereto and incorporated by this reference. The terms "Easement" and "Easement Area" in this instrument refer to the easements described i n Exhibit C. HWDK10 /14/98 _ .,� • 9812313023 The Easements are granted subject to and conditioned upon the following terms, conditions and covenants which HWD hereby promises to faithfully and fully observe and perform: 1. Consideration. HWD shall pay the sum of $140,000.00 to Highline School District within thirty days of mutual acceptance of this Agreement by HWD and HSD. z wne 2 6 00 N 0 cn w w z: .JF-i 1.2. HWD shall complete the following work at the sole expense of N p': HWD: 2 g J 1.2.1. Subject to the limitations specified in this Agreement, and in n a: accordance with the Contract Documents identified in w Exhibit D, demolish and remove the debris from the existing z x' school buildings located on the portion of the Crestview Site z o: as more particularly described in Exhibit C as the w w "Demolition Site." D oV 10 N' 1.2.2. Design, construct, maintain and repair the Reservoir. 'o L.: w ut 1.2.3. Design, construct, maintain and repair the Reservoir Lid I over the Reservoir in such manner that will permit the z future installation of recreational equipment by HSD, at o LU -' HSD's expense, on the Reservoir Lid. o 1' z 1.2.4. Landscape the Reservoir Lid and the Demolition Site in accordance with City of Tukwila landscaping plans as approved by HSD. Ownership of the landscaping improvements, any irrigation systems, all nonreservoir structures, improvements, and fixtures shall remain vested in HSD. 1.2.5. HWD shall be prohibited from providing any of the soil removed from either the Reservoir or the Demolition Site to the Port of Seattle. 1.2.6. HWD shall cap the existing utilities in the locations specified on the site plan attached as Exhibit E. 2. Approval of Construction Plans. 2.1. Prior to the demolition and removal of the Crestview school buildings and prior to the construction of. the Reservoir or any HWDK10 /14/98 -2- other substantial activity by HWD. on the Crestview Site, HWD shall submit the plans and specifications to HSD and no work by HWD shall be commenced without HSD's prior written approval of the plans and specifications, which approval shall not be unreasonably withheld; provided, however, that in the event of an emergency requiring immediate action by HWD for the protection of its facilities, persons or other property, HWD may take required action upon such notice • to HSD as is reasonable under the circumstances. z �w rt 00 wI 2.2. Any changes or revision to the plans and specifications approved uj 0 by HWD shall also be subject to HSD's approval. Nothing in this Agreement shall be deemed to impose any duty or obligation on HSD to determine the adequacy or sufficiency of HWD's plans, a. design and specifications, or to determine whether HWD's _: construction is in conformance with the plans and specifications z I" approved by HSD. z F- LU ILI 3. Construction, Alterations, Repairs and Maintenance: �,,,� 3.1. HWD shall apply for a building and other required permits within = w` 180 days of the date of this Agreement. Construction shall be f- �?, commenced within 180 days after all required permits are issued "-- 0 ( "Date of Commencement "). In any event construction must be iui z. commenced within 18 months of the mutual acceptance of this F—. Agreement. If construction has not commenced within eighteen z (18) months of the mutual acceptance of this Agreement, either O) HWD or HSD shall be entitled to terminate this Agreement on written notice to the other ' 'thereafter. As used herein, "commencement of construction" shall mean that all applicable permits have been obtained for construction of the Reservoir and HWD shall have issued a notice to proceed to the contractor and commenced excavation work with respect to the Reservoir. 3.2. Construction of the Reservoir shall be completed within 18 months after the Date of Commencement, subject to reasonable extensions for inclement weather, labor disputes, strikes, acts of God and other circumstances beyond the control of HWD. In any event, the construction shall be complete within 3 years of the Date of Commencement. 3.3. HWD shall construct the Reservoir in a good and workmanlike manner, using materials meeting industry standards in accordance HWDK10/ 14/98 • •. -3- C7 N 4. Governmental Approvals. HWD shall be responsible for and shall Csecure all necessary governmental approvals and permits for the demolition, of the school buildings, construction and operation of the t''t Reservoir. In the event any permits are subject to conditions affecting fri site ownership, HSD shall have approval rights over such conditions CO prior to the issuance of the permit. with applicable requirements, statutes, regulations, orders and regulations of any public authority having jurisdiction. 3.4. During the term of this Agreement, HWD shall maintain and repair all structures, utilities, improvements and fixtures related to the operation of the Reservoir constructed or installed on the Crestview Site by HWD. In the event HWD fails to make necessary repairs which creates a public safety hazard, HSD, after notice to HWD may, but shall not be required to, enter the premises and perform the necessary maintenance or repairs. HSD may charge the cost of the repair to HWD. Such charges shall be due and payable on the first day of the month after which HSD has billed HWD for the cost of the work. 3.5. Subject to the restrictions imposed by the Easements, following construction and landscaping of the Reservoir Lid in accordance with Paragraph 1.2.4, HSD shall be the owner of, .and have sole responsibility for the maintenance and repair of, all landscaping improvements, irrigation systems, and nonreservoir structures, improvements, and fixtures above the Reservoir. 5. Utilities. HWD shall pay all charges for installation and use of gas, electricity, water, sewer and all other utilities used in the demolition of the school buildings, construction and operation of the Reservoir. 6. Taxes. The property is presently exempt from real property taxation. In the event the property becomes subject to taxation during the term of this Agreement, HSD or its successor shall pay all tax assessments. HWD shall reimburse HSD or its successor for any portion of the taxes directly attributable to the Reservoir. 7. Environmental Provisions. Except as provided in Paragraph 15 of this Agreement, HWD shall comply with applicable laws, environmental laws, orders and regulations of federal, state, county and municipal authorities, and with any directive issued pursuant to law by any public officer, which shall impose any order or duty upon HWD pertaining to the construction and operation of the Reservoir. HWDK10 /14/98 -4- • . z H z f. (xw U 0` 0 N w. • J H w0 ga I- w =. I-: I- 0 Z UJ D o. 'o 0H ww F=-U, i= C' 1.1.1 ='. z i • 9812313023 1 7.1. HWD shall have the right, upon providing written notice to HSD, to contest any obligations imposed upon HWD pursuant to the provisions of this Section, and to defer compliance during the pendency of the contest, provided that the failure of HWD to comply will not subject HSD to civil fine or criminal penalty. 7.2. Notwithstanding the foregoing, in the event that HWD's failure to promptly fulfill the contested obligations shall pose an imminent threat to public health, safety or the environment, HWD shall immediately perform whatever actions may be required to abate the immediate threat. HWD may, thereafter, contest the obligations and defer further compliance, as set forth above. { z W 6 n JU 0 0: N w; w I. w O u_ Q' 7.3. Failure of HWD to comply with the provisions of this Section shall 0) d be an act of default under the terms of this Agreement and shall '2 w. entitle HSD to pursue all applicable remedies. In addition, HSD z shall be entitled to collect from HWD any fines, penalties, expenses z 0 of defense (including legal fees), expenses of compliance and other w w: damages incurred by HSD by reason of HWD's default under this D 0: U Section. 0 N° 0 1-': w w` i e3 -• O w z' 0 -' 0 8. Easement Insurance. 8.1. HWD shall maintain property insurance (special causes of loss form P1030) on the Reservoir and all facilities placed on the Crestview Site by HWD for the benefit of HSD and HWD, as there interests shall appear, in an amount sufficient to repair or replace the structures. 8.2. HWD shall maintain comprehensive general liability insurance with a policy limit of not less than $5,000,000.00 per claim covering the actions of HWD on the Easement Area in the construction and operation of the Reservoir. 8.3. HSD shall be named as an additional insured on the policies of insurance required under this section and shall be provided with certificates of insurance evidencing coverage annually at the request of HSD. Such certificate shall be subject to the approval of HSD and will reflect coverage placed with insurance companies licensed to do business in the State of Washington with a Best's rating of not less than A -VIII. The certificates will reflect that coverage cannot be altered or canceled without first providing forty -five (45) days written notice to HSD. HWDK10 /14/98 -5- z 8.4. In the event HWD fails to secure the required insurance, HSD may obtain the insurance and charge the premiums to HWD which charges'shall be due and payable on the first day of the month after which HSD has billed HWD for the premiums. 8.5. HWD shall require the contractor who performs the construction of the Reservoir to obtain builder's risk insurance. HSD and HWD shall be named as additional insured on the policy. 8.6. HWD shall require the contractor who performs the Reservoir construction to carry comprehensive general liability insurance, including coverage for the removal of hazardous waste materials, with limits of not less than $5,000,000 per project. Coverage shall include Explosion, Collapse and Underground (XCU). If such coverage is written on a claims made form , then the limits shall be not less than $5,000,000 per claim, and the contractor shall provide continuous coverage for a period of not less than two (2) years after completion of the construction. HSD and HWD shall be named as additional insureds on the policy, per additional insured form B (CG 2010), or its equivalent. The contractor shall provide a certificate of insurance showing evidence of this insurance. Such insurance shall be placed with insurance companies with a Best's C? rating of not less than. A -VIII. The certificate shall reflect that G coverage cannot be , altered or canceled without first providing forty -five (45) days written notice to HWD and' HSD. r.4 C9. Building Demolition and Removal Insurance. HWD shall require the r4 contractor who performs the building demolition and removal to carry comprehensive general liability insurance, including coverage for the removal of hazardous waste materials, with limits of not less than $5,000,000 per project. Coverage shall include Explosion, Collapse and Underground (XCU). If such coverage is written on a claims made form, then the limits shall be not less than $5,000,000 per claim, and the contractor shall provide continuous coverage for a period of not less than two (2) years after completion of the construction. HSD and HWD shall be named as additional insureds on the policy, per additional insured form B (CG 2010), or its equivalent. The contractor shall provide a certificate of insurance showing evidence of this insurance. Such insurance shall be placed with insurance companies with a Best's rating of not less than A -VIII: The certificate shall reflect that coverage cannot be altered or canceled without first providing forty -five (45) days written notice to HWD and HSD. HWDK10 /14/98 -6- z �z re w JU UO. 0: cn w; w z: w O. 2 a = w: z� z �: o. o N`. o I w w. • U; Os z: U Z O 10. Indemnification. HWD covenants and agrees with HSD that it will indemnify, defend and hold HSD harmless from and against any and all liability, damages, penalties or judgments (including without limitations, attorneys fees) for injury to persons or property sustained by anyone in and about the Easement Area resulting from any acts or acts of omission or commission of HWD, or HWD's officers, agents, employees, contractors or assignees. HWD shall, at its cost and expense, defend against any and all such claims, suits or actions (whether just or unjust) which may be brought against HSD because of any such above - mentioned actions. HSD shall not be responsible or liable for any damage to any property, fixtures, buildings or other improvements constructed or installed by HWD, or for any injury to any person or persons, at any time on the Easement Area, including any injury to HWD or to any of HWD's officers, agents, employees, contractors, customers or assignees, except as may result from acts or acts of omission or commission of HSD or HSD's officers, agents, employees, assignees or contractors. 11. Destruction by Casualty. In the event the Reservoir shall be damaged to the extent that it is no longer useable as an operational reservoir, HWD shall not be required to rebuild. HWD may elect, within 180 days after the date of destruction, to terminate this Agreement. In that event, HWD shall apply so much of the available insurance proceeds as may be required to satisfy the construction loans, any liens which were expressly approved, in writing, by HSD and to promptly restore the ri Easement Area to a safe and usable condition in accordance with paragraphs 13 and 14. The remainder of the proceeds, if any, shall remain the property of HWD. fi 12. Default. 12.1. The following shall be events of default under the terms of this Easement Agreement: 12.1.1. failure to perform the obligations specified in Section 1; 12.1.2. failure to comply with any law, regulation, policy or order of any lawful governmental authority; 12.1.3. failure to comply with any other provisions of this Agreement; 12.2. In the event of default, the non - defaulting party shall give written notice of default to the defaulting party, specifying the nature of the HWDK10 /14/98 -7- z w .` J V, U0 CO 0 LLJ J F-. C°_ u.. w O, u.a d �w z �- O' zI U on CI w W' uiz U N: F- O z i • default. The defaulting party shall have 30 days from the date of notice to cure a monetary default. The defaulting party shall have 90 days from the date of notice to cure or initiate the necessary proceedings to cure a non - monetary default. If the defaulting party fails to cure the default or initiate the necessary proceedings to cure a non - monetary default within the specified time and diligently prosecute such cure to completion, the non - defaulting party may terminate this Agreement. z i~ ~w 00 CD C W 13. Obligations on Termination. In the event this Agreement is terminated N 1.—: w� ga 92 = W z�. 0 z� 11J w C' o �. = 1- 5 "' O Z U -. � _ 0 z pursuant to paragraphs 11, 12, or 15 the following obligations shall exist. 13.1. Except in the situation where the termination is due to a default by HSD, as defined in paragraph 12, the termination of this Agreement shall not release HWD from any liability or obligation arising under this Agreement prior to such termination. 13.2. On termination of this Agreement for any reason, HWD shall not be required to remove the Lid, or remove the Reservoir but shall be required to leave the Easement Area in a safe and usable condition in accordance with then existing engineering and safety standards. Under current engineering and safety standards it would not be unreasonable for HWD to be required to fill the reservoir with a material such as sand. HSD shall provide prior written approval of the plans and specifications for leaving the Easement voi C9 Area in a safe and usable condition, which approval shall not be unreasonably withheld. CO 14. Property Ownership. On the termination of this Agreement all structures, improvements and fixtures of any nature constructed or installed by HWD on the Crestview Site shall, subject to HWD's compliance with paragraph 13, become the property and responsibility of HSD and shall not be removed by HWD. Notwithstanding the foregoing, removable trade fixtures may be removed by HWD from the Crestview Site at the termination of this Agreement. HWD shall repair any damage caused by the removal. If HWD fails to remove such trade fixtures, HSD may, at HSD's option, deem the trade fixtures part of the premises, or may remove and dispose of such fixtures at HWD's expense. 15. Hazardous Substances 15.1. Reservoir Site. In the event HWD discovers any condition during or after the excavation and construction of the Reservoir that HWDK10 /14/98 -8- would indicate the possible existence of Hazardous Substances o n the Reservoir Site, HWD shall be responsible for whatever actions are necessary, at its sole cost and expense, to remediate, remove or otherwise clean the Reservoir Site as required by local, state and federal law. HSD assumes no obligation for the remediation, removal or clean up of any Hazardous Substances existing on the Reservoir Site, unless HSD agrees to do so in writing subsequent to the execution of this Agreement. HWD shall indemnify, defend and hold HSD harmless from and against any and all liability, damages, and penalties incurred by HSD as a result of the presence, remediation, removal or other clean up of Hazardous Substances on the Reservoir Site. 15.2. Demolition Site. With the exception of the known and identified Hazardous Substances identified, or reasonably suspected, in the environmental reports listed in Exhibit D ( "Environmental Reports "), in the event that HWD discovers • any condition prior to or during the demolition and removal of the existing buildings as described in Exhibit D, that would indicate the possible existence of Hazardous Substances on the . Demolition Site, HWD shall immediately notify HSD. Upon notification, HSD shall be responsible for whatever actions are necessary, at its sole cost and C► expense, to remediate, remove or otherwise clean such newly identified Hazardous Substances on the Demolition Site as C■2 required by local, state and federal law, unless such matter is caused by the negligence or willful misconduct of HWD. (71 HWD assumes no obligation for the remediation, removal or clean up of any Hazardous Substances existing on the Demolition Site as described in Exhibit D, unless specified, or reasonably suspected, in the Environmental Reports listed in Exhibit D or unless HWD agrees to do so in writing subsequent to .the execution of this Agreement. HSD shall indemnify, defend and hold HWD harmless from and against any and all liability, damages, and penalties incurred by HWD as a result of the existence of Hazardous Substances on the Demolition Site in excess of the known, or reasonably suspected, Hazardous Substances as described in the Environmental Reports listed in Exhibit D. HWDK10 /14/98 The parties acknowledge that the Environmental Reports specify certain Hazardous Substances which are either known to exist on -9- z J U' I.) 0: 'coo' • W z' J � N w o. J LL �, N d, = I-o z 1: w UD 11.1 la; U. • w r_ off Z...: the Demolition Site or are reasonably suspected to exist thereon (for example, some asbestos containing materials ( "ACM ") are known to exist, and some are reasonably suspected to exist, within the buildings located on the Demolition Site, but the exact amount of such ACM's has not been identified or fully quantified). The parties acknowledge that HWD shall be responsible for the remediation, removal and cleanup of such Hazardous Substances, known or reasonably suspected, even though the exact amount thereof may not be known as of the date of this Agreement, and HWD acknowledges that the reasonably . suspected presence of Hazardous Substances has been taken into account in preparing the demolition plan identified in Exhibit D. The responsibility of HSD with respect to Hazardous Substances existing on the Demolition Site shall only extend to those Hazardous Substances that are (a) not identified in the Environmental Reports as either known to exist.or reasonably suspected to exist, and (b) first discovered during the demolition and excavation on the Demolition Site. 15.3. The term "Hazardous Substances" shall mean any substance or material now or hereafter defined or regulated as a hazardous substance, hazardous waste, toxic substance, pollutant, or ,contaminate under any federal, state or local law, regulation or V? ordinance governing any substance that could cause actual or suspected harm to human health or the environment. 16. Inspection. HSD shall have the right to enter the Easement Area at any reasonable hour to inspect for compliance with , the terms, of this Agreement. HSD shall provide HWD with notice of the inspection at least one day prior to making the inspection. Inspections shall not interfere with construction, operation and maintenance of the Reservoir. 17. Assignment. HWD may only assign or sell its interests under this Easement Agreement with the express written consent of HSD which consent shall not be unreasonably withheld. 18. Merger, Consolidation, Take Over. In the event of the merger, consolidation or take over of either HWD or HSD with or by another municipal corporation, this Easement Agreement shall remain in full force and effect and shall bind the successor municipal corporation. 19. Notices. Any notice required to be given to HSD shall be in writing and shall be personally delivered or sent certified mail, return receipt requested, to Assistant Superintendent of Support Services at the HWDK10 /14/98 -10- 1 following address: 15675 Ambaum Blvd. S.W., Burien WA 98166. Any notice required to be given to HWD shall be in writing and shall be personally delivered or sent certified mail, return receipt requested, to General Manager at the following address: P.O: Box 3867, Kent, W A 98032. 20. Jurisdiction. This Agreement shall be governed by the laws of the State of Washington. 21. Dispute Resolution. All claims, disputes and other matters in question between the parties, direct or indirect, arising out of or relating to demolition or construction activities under this Agreement, or the breach thereof, ( "Claims, ") shall be decided by arbitration in King County, Washington, in accordance with the Construction Industry .Arbitration Rules of the American Arbitration Association currently in effect unless the parties mutually agree otherwise. The arbitrator(s) shall not be empowered to grant exemplary or punitive damages. Notice of the demand for arbitration shall be filed in writing with the other party to this Agreement and with the American Arbitration Association and shall be made within a reasonable time after the dispute has arisen. The parties shall apply to the arbitrators for relevant discovery consistent with the Federal Rules of Civil Procedure, which the arbitrators shall be authorized to order. Either party may request v,1 that the arbitrator's award include findings of fact and conclusions of law. The award rendered by the arbitrator or arbitrators shall be final rand judgment may be entered upon it in accordance with applicable law QO in any court having jurisdiction thereof. Within 15 days of receipt of the written findings of fact and conclusions of law, either party will have the right to file with the arbitrators-and serve on the other party a written motion to reconsider. The arbitrators may request the nonmoving or responding party to file a written response within 10 days after receipt of that request, and the arbitrators thereupon will reconsider the issues raised by the motion and response (if any) and either confirm or alter their decision, which will then be final, binding and conclusive upon the parties. The. cost • of such motion for reconsideration and written opinion of the arbitrators, including reasonable attorneys fees, will be awarded against the moving party if it does not prevail. Upon demand of either party, the arbitration shall include, by consolidation, joinder or third -party claim, any person or entity substantially involved in a common question of fact or law, where the presence of such person or entity is required if complete relief is to be accorded in the arbitration, or who is alleged to be liable to a party for all or part of a claim in the arbitration. The agreement herein among the parties to this Agreement and any other written agreement HWDKIO /14/98 to arbitrate referred to herein shall be specifically enforceable under applicable law in any court having jurisdiction thereof. 22. Attorney's Fees. In the event of dispute resolution regarding the terms of this Agreement, the prevailing party shall be entitled to reimbursement for all costs, expenses and reasonable attorney's fees incurred in connection with the realization or enforcement of any term, condition, provision or remedy contained in this Easement Agreement or related documents, with or without litigation, including without limitation the costs, expenses and fees incurred on appeal, in any arbitration but not in any mediation. 23. Waiver. Any failure by either party to enforce any right arising hereunder shall not be deemed a waiver of such right. 24. Modification. This Easement Agreement represents the entire agreement between the parties. No change, termination or attempted waiver of any of the provisions of this Agreement shall be binding on either of the parties unless executed in writing by authorized representatives of each of the parties. The Agreement shall not be Or modified, supplemented or otherwise affected by the course of dealing between the parties. 25. Benefits. This Easement Agreement is entered into for the benefit of the parties to this Agreement only and shall confer no benefits, direct or implied, on any third persons. 26. Binding Effect. This Easement Agreement shall be binding on and inure to the benefit of the parties their legal .representatives, successors and permitted assigns. 27. Severability. If any provision of this Easement Agreement or its application is held invalid, the remainder of the Agreement or the application of the remainder of the Agreement shall not be affected. Dated: "eLE t'16E'n- FOt 14 i HIGHLINE WATER DISTRICT • /00 CITY OF TUKWILA By: HWDK1 4/98 HIGHLINE SCHOOL DISTRICT NO. 401 -12- ACKNOWLEDGMENTS - ALL SIGNATURES MUST BE ACKNOWLEDGED STATE OF WASHINGTON, ) ACKNOWLEDGMENT ) ss. OF County of King. ) REPRESENTATIVE Yem I certify that I know or have satisfactory evidence that S. Ioe signed this instrument, on oath stated that she /he was authorized to execute thstrument and acknowledged it as the MotvatAar of HIGHLINE WATER DISTRICT to be the free and voluntary act of subh party for the uses and purposes mentioned in the instrument. SUBSCRIBED AND SWORN TO before me on OAot3et a 0 ,19` k P R. f STATE OF WASHINGTON, ) County of King. ss. Notary Public in and for the State of Washington, Residing in VklinkCos,c,�-�yr My appointment expires Co aid •- aoo t ACKNOWLEDGMENT OF REPRESENTATIV E Ct I certify that I know or have satisfactory evidence that v_ igned this I instrument, on oath stated that she /he was authorized to execu the instrument and acknowledged C", it as the Jof HIGHLINE SCHOOL DISTRICT NO. 401 to be the free 4.4 and voluntary act f such party for the uses and purposes mentioned in the instrument. CNI SUBSCRIBED AND SWORN TO before me on STATE OF WASHINGTON, ) ) ss. County of King. ) /6 ,19 .S Notary Public in and for the S ate of Washington, Residing in -�-� My appointment expires ACKNOWLEDGMENT OF REPRESENTATIVE I certify that I know or have satisfactory evidence that signed this instrumen on oath stated that she /he was authorized to execute the instrument and acknowledged it as the of CITY OF TUKWILA to be the free and voluntary act of such party for uses and purposes mentioned in the instrument. SUBSCRIBED AND SWORN TO before me on al /6j , 19 i H. HWDK10 /14/98 -13- Notary Public in and for the State Washington, Residing in ► .ate, CD• • My appointment expires Z tvw' J0, 0 0 W= J H; w 0, ga v1 ▪ _: Z t- 0 Z F- al CU U O N', ca w w. t- -.21 uy Z Exhibit A Description of Crestview Site to the Agreement and Easement for Water Reservoir dated 1412 , 191, between HIGHLINE SCHOOL DISTRICT NO. 401, a municipal corporation organized and existing under the laws of the State of Washington, and HIGHLINE WATER DISTRICT, a municipal corporation organized and existing under the laws of the State of Washington. 750' ;o Ga CO 690' Measurements are approximate Drawing not to scale So. 164th St. E AREA: 475,330 Sq ' 10.9 Acres LEGAL DESCRIPTION: Kroll 343 E. Thot portion of the northeast quarter of section 27, township 23 north, range 4 east, W.M., described os Follows: Beginning on the north line of said section 27, distant north 89° 59' 10" west 1706.10 Feet from the northeast corner thereof; thence south 0° 15' 50" east 305.40 feet to the true point of beginning; thence continuing south 0° 15' 50" east 886.20 Feet to the northerly margin of South 164th Street; thence north 89 °59' 10" west, along said northerly road margin, 60 feet; thence north 0° 15' 50" west 290.40 feet; thence north 89° 59' 10" west 690.00 Feet; thence north 0° 15' 50" west 260.40 feet; thence north 89° 59' 10" west 150.00 feet to the easterly margin of 42nd Avenue South; thence north 0° 15' 50" west, along said easterly road margin, 60 Feet; thence south 89° 59' 10" east 150.00 feet; thence north 0° 15' 50" west 275.40 feet; thence south 89° 59' 10" east 750.00 Feet to the true point of beginning. HWDK10 /14/98 -14- �: ... Exhibit B Description of Leased Premises to the Agreement and Easement for Water Reservoir dated t'' %l0 , 1912 between HIGHLINE SCHOOL DISTRICT NO. 401, a municipal corporation organized and existing under the laws of the State of Washington, and HIGHLINE WATER DISTRICT, a municipal corporation organized and existing under the laws of the State of Washington. That portion of the Northwest Quarter of the Northeast Quarter of Section 27, Township 23 North, Range 4 East, W.M., in King County, Washington, described as follows: Beginning at a point on the North line of said subdivision distant North 89° 59' 10" West 1706.10 feet from the Northeast corner of said Section 27; thence South 0° 15' 50" East 305.4 feet to the true point of beginning of this description; thence North 89° 59' 10" West 600.00 feet; thence South 0° 15' 50" East 0.40 feet; thence North 89° 59' 10" West 150 feet; thence South 0° 15' 50" East 275.00 feet; thence North 89° 59' 10" West 150 feet; thence South 0° 15' 50" East 30.00 CI feet; thence South 89° 59' 10" East 260.00 feet; thence North 0° 15' 50" West 85.40 feet; thence - South 89° 59' 10" East 410.00 feet; thence South 0° 15' 50" East 375.80 feet; thence South 89° 59' Q 10" East 170.00 feet; thence South 0° 15' 50" East 290.40 feet; thence South 89° 59' 10" East 60.00 feet; thence North 0° 15' 50" East 886.20 feet to the true point of beginning. fril CI • (Being known as the South 30 feet of Lot 1, the South 305.4 feet of Lot 2 except the South 85.4 Csit feet of the East 40 feet of said Lot 2, the North 220 feet of the South 305.4 feet of Lots 3 and 4, the South 305.4 feet of Lots 5 and 6 except the South 85.4 feet of the West 70 feet of said Lot 5, 73 the North 290.4 feet of the East 80 feet of Lot 34, and lot 33 except the South 290.4 feet of the West 90 feet of said lot 33, all in Block 5, McMicken Heights Division No. 2 according to the unrecorded plat thereof. HWDK10 /14/98 -15- . a X U O, CO a CO W:. J; w0 I— w Z 1— O` Z I— . n p. -. 0 H W w.. —0: LLI Z:. U Ni 01 Z Exhibit C Description of Reservoir Easement The Easement Description contained herein may be modified by mutual agreement of the parties to conform with the final plans and technical . a specifications for the reservoir as approved by Highline School District. F z'. cew 6 J O: U 00 U (n w W J H; w O. u_ -J ca a _: z�; I-0 Z ►- � o: 0 N: 0 - =w F' .. z 0 —. H 0 RESERVOIR SITE: A non - exclusive easement for the purpose of constructing, operating, maintaining, repairing, and using an underground reservoir, underground utilities leading to and from the reservoir and all necessary surface structures, vents, access hatches and utility buildings, together with the nonexclusive right of ingress to and egress from the reservoir for the foregoing purposes, across, along, in, upon, under and above the following described real property situated in King County to wit: t4) That portion of the Northeast 'quarter of Section 27, Township 23 North, Range 4 East, W.M., .King County Washington described as follows: Beginning on the North line of said Section 27, distant N 89° 59' 10" W 1706.10 feet from the Northeast corner thereof; thence S 0° 15' 50" E 305.40 feet; thence N 89° 59' 10" W a distance of 420 feet to the true r point of beginning; thence continuing N 89° 59' 10" W a distance of 330 feet; thence S 0° 15' 50" E distance of 275.40 feet; thence N 89° 59' 10" .W a distance of 150 feet to the easterly right -of -way of 42nd Avenue South; thence S 0° 15' 50" E along the easterly right -of -way of 42nd Avenue South a distance of 60 feet; thence S 89° 59' 10" E a distance of 280.47 feet; thence N 47° 10' 59" E a distance of 81.49 feet; thence S 89° 59' 10" E a distance of 139.50 feet; thence N 0° 15' 50" W a distance of 280 feet to the true point of beginning. This easement shall prohibit the construction of any improvements on the lid of the reservoir ( "Reservoir Lid ") which, in HWD's reasonable discretion, are determined to interfere with or pose a threat to the structural integrity of the Lid and Reservoir and the operation of the Reservoir. HSD shall limit uses on the lid of the Reservoir to assure that the "Live Load" shall not exceed 100 lbs /sq. ft. or HS -15 highway loading whichever is greater. "Live Load" is defined as loading on the Reservoir Lid above and beyond the weight of the earth cover. The earth cover shall be a minimum of two feet in depth. DEMOLITION SITE: Together with a temporary non - exclusive easement for surface parking, pedestrian access, demolition of existing buildings and construction activities HWDK10 /14/98 -16- z 9812313023 related to the construction of an underground water reservoir across, along, upon, under and above the following described real property situated in King County to wit: Commencing at the northeast corner of the parcel described in "Exhibit A "; thence N 89° 59' 10" W along the north line of said parcel a distance of 750 feet to the northwest corner of said parcel; thence S 0° 15' 50" E along the west line of said parcel a distance of 275.40 feet; thence N 89° 59' 10" W a distance of 150 feet to the easterly right -of -way of 42nd Avenue South; thence S 0° 15' 50" E along the easterly right -of -way of 42nd Avenue South a distance of 60 feet; thence S 89° 59' 10" E a distance of 150 feet to the true point of beginning; thence S 0° 15' 50" E a distance of 260.40 feet to the southwest corner of said parcel; thence S . 89° 59' 10" E a distance of 580 feet; thence N 0° 15' 50" W a distance of 100 feet; thence N 49° 18' 14" W a distance of 331.05 feet; thence N 89° 59' 10" W a distance of 139.50 feet; thence S 47° 10' 59" W a distance of 81.49 feet; thence N 89° 59' 10" W a distance of 130.47 feet to the true point of beginning. The temporary easement shall terminate and expire without further action of the parties on June 1, 2001. HWDK10 /19/98 -17- • z ~ w re J U'. U'O; R N0 ww w O, ,� Q. o. . z H Oi ..z ~;. • w w: U :0 W .z, . w ( Exhibit D Building Demolition and Removal Specifications z' The Description contained herein may be modified by mutual agreement of the parties to conform with the final plans and technical specifications for the re 2tu building demolition and removal as approved by Highline School District. 6D ...1 c.): c.) 0 i 2 2 DEMOLITION CONTRACT DOCUMENTS: u) u_ w 0 Contract Documents: Water Storage Improvements Project 7.6 million gallon 2 , • reservoir project No. 96-3 Phase I Crestview;cElementary School Demolition for Highline Water District Contract No. 98-1-05, dated ID, - Li , 1998, u_ n' prepared by Parametrix ; Inc. incorporated by this reference. t- w ...„ M: dr.. 1....; ENVIRONMENTAL REPORTS: I— 0: 1. Phase. One Environmental Site Assessment, Crestview Elementary • 2 D: School (E-0758), by GEO Group Northwest, Inc., dated June 5, 1997. 'D 0: Asbestos Report from Pacific Rim Environmental, Inc. to Parametric, at ..., Inc., dated April 17, 1998. , 1- u.1.--. :.. .tu co :0— I, • 0 l'' ILI Lu; j. 1 • FIWDK10/14/98 -18- at4 111 X i.1 1r;XR1 S Y al 1, §i ?II EY 1., ! i 01 111 ON 1 1 i R d i it, g8 3 WI • $ 1 a • _ g oil MI 1111 0111 i$ Y i. R Y1 Rt ri ill o ii a s ii i °' ig it %iiili 3iii i811a� i10 $ ii, iire1iis11 0 0 0000 00 0 00 0 00 0 0000 a 8 1" 1; CIS HIf10S 3f1N3AV ONZ4 0 8 z Z. 6 U 0 W N LL WO g Q co W r T Z�' Z� W W U� O S oi- W W LLO Z' W U N O z Z MEMORANDUM ce 2 JU o TO: Steve Lancaster, File u) No FROM: Michael Jenkins w =. DATE: October 20, 1998 -' ►-. RE: Crestview Reservoir - Concern by adjacent property owner W o I received a call today from Kurt Treadwell (241- 7200), whose property abuts u. a Crestview Park at 4255 S. 160th. Mr. Treadwell called concerning when the D. d hearing would be for the reservoir so that he could comment about his concerns ►- i about access from the Park to his property and what impact the reservoir would z o' have on park users being able to access his property. w o. w I told him that the hearing occurred on October 5 and that the period to appeal 0 N; had passed today. He was quite upset because he was told by Don Williams in 0 June, 1998 that the opportunity to comment on the project would only occur after = W October 5, when the City Council would be deciding if the project "could go P through ". Mr. Treadwell was also told by Keith Harris of Highline Water District z during the January, 1998 SEPA open house that there would be an opportunity 6 ...: �: to comment, but he did not specify a particular date. Mr. Treadwell also said that 1-1 Don had told him that the existing 4 foot fence was specifically requested along Z Mr. Treadwell's side of the park when the fence was first erected, which Don said is different than the normal 6 foot required fencing. Don never informed me of these conversations nor referred Mr. Treadwell to the Planning Department. I asked Mr. Treadwell if he had received copies of the Notice of Application or Notice of Hearing and he said that he did not. He told me that he and his neighbors had discussed the project and based upon his conversations with Don that they would hold their comments until after October 5. While Mr. Treadwell was on the phone I looked at copies of the Affidavit of Mailing and found that none of the property owners on Mr. Treadwell's side of S. 160th that abuts the north side of Crestview Park were mailed Notices. However, it appears that the residents along the opposite (north) side of S. 160th did receive public notice. I then asked Mr. Treadwell if any of the people who lived across the street and received notice were the people who he discussed the project with, to which he answered yes. Towards the end of the phone call, Mr. Treadwell seemed calmer and started acknowledging issues that I was raising, such as his doing work on his side of the property to address his long- standing concerns about visibility, access and noise, the fact that the work at the portion of the park will not affect him nearly as the residents on the west side of the park that will be losing the trees. He also agreed that people sometimes "slip through the cracks" on getting notice and it probably wasn't anyone's fault. He also indicated that he would be talking to his neighbors to find out why they did not inform his that they received notice of the hearing and open house. I told Mr. Treadwell that he should come in, look at the plans, and see how the changes to the landscaping might actually be better for him than what is there now. I also told him that the City, School District and Water District needed to negotiate new leases and that maybe he could let his concerns be heard in hat forum. I also told him there was a possibility that the landscape plan could be altered to include what he called "stickery" bushes along the property line, similar to what was approved for the residents on the west side of the park. On our end, I will contact the consultant for the Water District and find out what happened in regard to missing mailing labels on their end or if we dropped the ball. We should probably also speak with Don about the importance of referring all questions on pending applications to the Planning Department. I think Mr. Treadwell's concerns can be resolved, but I am troubled about the lack of coordination on our end, the failure of the consultant in providing all the mailing labels and how to improve on our public outreach in general. z. 1 w U: 00 0 WI N LL, W o, g a a' z� Z i-" LIJ U0 :o -; wui w z, o1 z City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster Director October 20, 1998 Kurt Treadwell 4255 S. 160th Street Tukwila, WA 98188 Re: Notice of Decision - Crestview Reservoir Dear. Mr. Treadwell: Thank you for your phone call today concerning the approval of Crestview Reservoir on October 5, 1998. I have enclosed a copy of the Notice of Decision that outlines the approval of the reservoir and the conditions required by the City Council to be fulfilled prior to the issuance of required permits. Please note that there are a number of attachments to the Notice of Decision that includes the landscaping plan that we discussed. On the landscape plan you will see that there will be plantings of Birch and Cotoneaster. As I indicated, once you have spoken to your neighbors about the notices that were mailed to them about the hearing, I would be happy to arrange a time to discuss the landscape plan and any minor alterations that may be affected to ensure limited access along the north portion of the project. Sincerely Michael Jenkins Assistant Planner 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431 -3665 A F F I D A V I T 0 Notice of Public Hearing 0 Notice of Public Meeting aBoard of Adjustment Agenda Packet O Board of Appeals Agenda Packet fl Planning Commission Agenda Packet O Short Subdivision Agenda Packet O F D I S T R I B U T I O N hereby declare that: Q Notice of Application for Shoreline Management Permit 0 Shoreline Management Permit was mailed to each of the following addresses on ODetermination of Non - significance 0 Mitigated Determination of Nonsignificance 0 Determination of Significance and Scoping Notice ONotice of Action O Official Notice 0T1 A SI ON1 Other Name of Project_ File Number eg'31- 0 ►o76I9S� Signature �te0A 'fig iC � h fnY� NIiT yp 'n+49S�/�YW!bi,'.t �SV1R YiY`v Jl liiwuY�hn.i4Y>''•YFi �Yku.i�'N 4uYr�'Y. emi" To: City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director NOTICE OF DECISION October 6, 1998 • Highline Water District (applicant) • Highline School District (owner) • King County Assessor, Accounting Division • Parties of record (See Attached) This letter serves as a Notice of Decision and is issued pursuant to TMC 18.1 04.170. At their October 5, 1998 public hearing, the City Council approved the applicant's request for an Unclassified Use Permit for the installation of a 7.6 million gallon reservoir at Crestview Park, 16200 - 42nd Ave S. The City Council approved the Unclassified Use Permit with the following conditions: 1. A public outreach plan must be submitted and approved by the Department of Community Development prior to the issuance of a Demolition Permit for removal of Crestview School. This plan shall include information on how the neighborhood will be notified about the construction schedule and related construction activities, potential road closures and solutions that address limits to park access. 2. Because the applicant does not own the property affected by this proposal, the applicant must negotiate with and receive written approval and agreement from the property owner, Highline School District, and the leasehold interest owner, City of Tukwila, regarding their respective property rights, obligations and responsibilities. It is expected that these negotiations will be completed prior to the issuance of a Development Permit. PROJECT BACKGROUND a. Project file number: L98 -0034 b. The name of the property owner(s): Highline School District 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 MAMMY Y i s5.Vgeir341, w' • QQQ: 2; V' U O CO o W. W =; CO w: wo. •con; • _a: • • 1_0:. zi-• ,D o off' i0 H, W W = U:, o'. z: v =, z October 6,1998 Notice of Decision L98 -0034 - Crestview Reservoir - 16200 - 42nd Ave S. c. Project Description: Textual description as well as 8.5" x 11" site plans, building elevations and other appropriate characteristics. Unclassified Use Permit Application for a 7.6 Million Gallon underground reservoir d. Project location: 16200 - 42nd Ave S. e. The permits submitted concurrently with this application: None f Environmental threshold determination (if any): Determination of Non - significance, issued March 25, 1998 g. Property owners affected by this decision may request a change in valuation for property tax purposes notwithstanding any program of revaluation. Administrative appeals for the various permit Types are discussed below. The period for administrative appeals is 14 days, starting from the issuance of this Notice of Decision. The administrative body hearing the appeal is the City Council. All appeal materials shall be submitted to the Department of Community Development. Appeal materials shall contain: 1. The name of the appealing party, The address and phone number of the appealing party, and if the appealing party is a corporation, association or other group, the address and phone number of a contact person authorized to received notices on the appealing party's behalf, and 3. A statement identifying the decision being appealed and the alleged errors in that decision. The Notice of Appeal shall state specific errors of fact or errors in application of the law in the decision being appealed, the harm suffered or anticipated by the appellant, and the relief sought. The scope of an appeal shall be limited to matters or issues raised in the Notice of Appeal. Project materials including the application, any staff reports, and other studies related to the permit(s) are available for inspection at the Tukwila Dept. of Community Development; 6300 Southcenter Blvd.; Suite 100; Tukwila, WA; from Monday through Friday, between 8:30 AM to 5:00 PM. The project planner is Michael Jenkins, who may be contacted at 206 - 431 -3685 for further information. .. i .-•... - wr.*irC.t6:t 5= .'`.'.°H�E%F.' .�... �a.. >�5 ,i§gF,i'' ICIPAi t'. watttk VIE KM October 6,1998 Notice of Decision L98 -0034 - Crestview Reservoir - 16200 - 42nd Ave S. Parties of Record Keith Harris, P.E. Highline Water District 23828 - 30th Ave S. Kent, WA 98032 Mike 011ivant Parametrix 1231 Fryar Ave Sumner, WA 98390 Jim Onorati 16032 42nd Ave S. Tukwila, WA 98188 Tod Byquist 16211 45th Ave S. Tukwila, WA 98188 a W W 3- 2 z CO F. 6 U WZ4� **-4.5-20 WEENO W a2 5) ". y V 1 U R a z Z o� O IFiI Z w w O 4 O U J J ' o0 F—U N In W _ N C t S a. • fr.,.n*:1 �Y::H;+s��.i,'.'i il�`clir✓"".,"u'Yir4iy w"U'x13i'i�iiRi�ec =;^ . _o-.. ,.�., ' ,, ,1 2 tJ In Z cc ~ • 3 d.W W O�1- K m Vi aat-6 • La NO 2< • 1I.YUlO K cc sup cc eiaw 53 5 I �tO i wa dil i I g i i 0 1 ,r. GRADING PLAN a a . ^i1` x_, ;i'- L.fu�'.i.1.x�J•i�tre.� ti �'tv3 b.;: tilt %UL::.SUlrattt.affil.444V.s : Nl ikati %iava.r.th:i'L"'ieo.7iti .rl fii irazi ii i.thai4i;Y1 kiiiuW.iiO4.i+i Y ?, 14+. :' e :- �.i�c?i}�ii'�r Rdhil` q'f'r!' ` �', iJ bc+ tS+.- aY' s'u1.u�,'ii"N7't3. \il�.M.�'l'. 5 RESERVOIR SECTION Ehi Ire 9 1 elk { 4 l latnP•.• ::4 �x.ti7 -ifxl x. ..^.'Jti'..:c itud4..'��d :;ill::''$4 .i:91: a�dxi`:•ii44 •'e`r.. a,.tr 1 Y �' t •F�. nt.; �: 6it4�: i. 1• m; ,�'"£�e4.ks�ei�C"diFc+�st„"yt�` i�a�ii:tt!Y`�':.�v� 41` ifx�4i,;' assGrd: i&• iYs�2t. F! w' �r '�ki�?t��3Sn`:�".nti;4Ris:�;c. z w J U, U O: i. U ' (0 w J =. • LL: w O: LQ D. CJ, I- La Z Z UJ D p, = 0, • ri w Z' _• N • . r i 1 / }IIGHLINE RESERVOIR PLANT PALLET[ I . 1 I + // I ACER PLA MAPLE $ I NORWAY MAPLE �L f I T / I ,� ACER RUBRUM 'BONHALL• •... . --' // I �l BONIULL RED MAPLE I //O PSELIDOISUGA MENItE511 1 / PMUS NILRA y� I O AVSfR,AN BLACK PINE i/ BE LULA JACOUVIONIK I r.cou[Ma+m BIRCH I / I BIUJA OCCIDEN7AUS YASRQATA' / LIMITS OF 1 AXIERICAN ARBORN IF — — _ —. CONSTRULDON — [VOMITUS COMPACT NtNGFD EVaIIMUS • 1 } fll COlONEASIER LALTEUS S_u ��jy\ 1 •• I I PARNEY COIONEASIER Otlik r ��i�l�tll++x � ASPHALT PATH I l 1.1 OREGON GRAPE OREGON f.RAPE C�IIf� dSfU$ PURPUREUS GRASS ) ORCHID ROCKROSE I� GRASS i- I C"•Jr ARACTOSIAPHiLOS UVA -URSI 'PANT REIES' ASPHALT ( ') BEARBERRY PARKING `` • I (yam'! BERBER'S THUNBERdI 'A IROPURPUREA' • � RELOCATED / RED -LEAF JAPANESE BARBERRY it f" PARK SIIEL TER �i�y$j1(� I �,._) NC ;pIEASTER 10NFA$!" O1 I ` I [XIS IING TREES 10 REMAIN PROPERTY tint —� .' ' ( +5 ' C `-ASPHALT PADI -1-: *WA' % , (. r � EXISTING SHRUB 10 REMAIN ASPHALT PAM . \ } C, _ • I ` . �� \+ I. 6' HIGH NOOD SCREENING MICE 1 GRASS CRASS ROCK OR BLOCK RETAINING � �� \ 200' aAMETER WALL Z' 10 A' Ilea/ • 1 AS 11 ) WATER RESERVOIR (-1:1\y 7.6 M/LLlal GAlla +$ IO EX'$N+G SCHOOL PARKNG LOT ANO • r�a . :0 •\ . SIDEWALK 10 RCMAtN //��� • * / •\ • ' ' ' � \ • •I 1 ``' "' ;i "'- "''` ��' NOT FOR CONSTRUCTION . 0... 4 +90rf O.R rt O la Y :r�r[ O• nOA[ +.xS fAlr • R. WARD R Parsmetrlll, Inc MaIUIIE WATER SISTEM =� ' • ®[ 1• +�i:'i;: ~:H�[r LANDSCAPE PLAN K. BO TON NOT f .I[ �rcwv»ra. wASwcml 2:1 ry �� 'CAL t..• 30. sm.. v >„� tio • =I— jj _• ...t........ Nwvlm �p 14-0 A. wA9MGtOH _ _. _ / out AUGUST 1998 XHM°'ilai 21- 271A -OI I "X ""'� 27140113 -� , R%: F' : 2t:. i. �- T :�;�:;:.'•-.t„lr`.S:i'1:tiikri? s7'iii� S:k,'.45if7i?f:4S'.a3i1,'t.�.` ESQ ,���c'4YY.ir"kvi3'+:.c�':�5,6s 111018/11. • XI 4i z �Z. Et 2 -I C.) U 0 W = J 1-, CO LL : W O, g• J, LL < zv 1-=. z �. F- 0 z�: O • co W W. z. 2 U =, O H. Z • At City of Tukwila NOTICE OF PUBLIC HEARING NOTICE IS HEREBY GIVEN THAT THE TUKWILA CITY COUNCIL WILL HOLD A PUBLIC HEARING ON MONDAY, OCTOBER 5, 1998, BEGINNING AT 7:00 PM IN THE COUNCIL CHAMBERS AT TUKWILA CITY HALL, 6200 SOUTHCENTER BLVD., TUKWILA, WASHINGTON, TO CONSIDER THE FOLLOWING: APPLICATION FOR AN UNCLASSIFIED USE PERMIT TO INSTALL AN 8.1 MILLION GALLON UNDERGROUND RESERVOIR AT 16200 42ND AVE. S. (CRESTVIEW PARK). Applicant: Highline Water District (Case #98 -0034) Information on the above case may be obtained through the Department of Community Development, Planning Division (206- 431 - 3670). ANY AND ALL INTERESTED PERSONS ARE INVITED TO BE PRESENT TO VOICE APPROVAL, DISAPPROVAL, OR OPINIONS ON THIS ISSUE. FOR THOSE UNABLE TO ATTEND IN PERSON, YOU MAY SUBMIT WRITTEN TESTIMONY TO THE CITY CLERK'S OFFICE UNTIL 5 PM ON MONDAY, OCTOBER 5,1998. THE CITY OF TUKWILA STRIVES TO ACCOMMODATE PEOPLE WITH DISABILITIES. PLEASE CONTACT THE CITY CLERK'S OFFICE AT (206) 433 -1800 BY NOON ON MONDAY IF WE CAN B OF ASSISTANCE. DATED THIS 1 DAY OF 1998. CITY OF TUKWILA E E. CANTU ITY CLERK DATE OF PUBLICATION: SEATTLE TIMES, SEPTEMBER 18, 1998 (-4 City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director CITY OF TUKWILA PUBLIC NOTICE Notice is hereby given that the City of Tukwila City Council will be holding a public hearing at 7:00 p.m. on October 5, 1998 located at 6200 Southcenter Blvd., to discuss the following: CITY COUNCIL PUBLIC HEARING CASE NUMBER: L98 -0034 APPLICANT: Highline Water District, By Parametrix, Inc. REQUEST: Unclassified use permit to install a 8.1 million gallon underground reservoir. 16200 42nd Ave. South Crestview Park LOCATION: Persons wishing to comment on the above cases may do so by written statement, or by appearing at the public hearing. Information on the above cases may be obtained at the Tukwila Planning Division at 431- 3670. The City encourages you to notify your neighbors and other persons you believe would be affected by the above items. Published: Distribution: Mayor, City Clerk, Property Owners /Applicants, Adjacent Property Owners, File. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 4313670 • Fax (206) 431-3665 Vglis aik'd 1'fS4.d'' vv+'3D5.?' ;S:i .;C "awti^ ,is aKr'.'CiiCIv�7�a itifi','.'s'r'E'vi ;k°re� kY''.t < {? ?iXl:' .k �L"l9.;,`.i?i%ph"%z"i -']�t� :t'.3!i'`.<S�";.' GfX.,i„�•a • • { City of Tukwila PUBLIC HEARING NOTICE e._rr-y L 0 twc_..4. c Notice is hereby given that the City of Tukwila P •. • s • ' . . •1 :.•1 .. •1 e will be holding a public hearing on OG7' 'j , 19 98 at 7:00 p.m. located at 6200 Southcenter Blvd., to discuss the following. /7-y G'&1Uc,C_ PLANNINCEFCAIMMISSION PUBLIC HEARING CASE NUMBER: 6..q8' O©3 APPLICANT: t 6'f-' NF moeree_ y • 4,t(� / ' - , / "k REQUEST: !.¢N F' P672-ii-4/ / /.4177-4-1.4,- -+ g . / 4((cc_ ! eA) 6/1-uo t/ ^.17, elLl,. !Z LOCATION:Gp—E -Nl6W fZ ,�. ( 1b200 z-/2-/Q Ave -oc-i-17-/ CASE NUMBER: APPLICANT: REQUEST: LOCATION: BOARD OF ARCHITECTURAL REVIEW PUBLIC HEARING CASE NUMBER: APPLICANT: REQUEST: LOCATION: Personal wishing to comment on the above cases may do so by written statement or by appearing at the public hearing. Information on the above cases may be obtained at the Tukwila Planning Division. The City encourages you to notify your neighbors and other persons you believe would be affected by the above items. Published: Seattle Times Distribution: Mayor, City Clerk, Property Owners /Applicants, Adjacent Property Owners, File i4+;s' env #:i"'.i4:;,v�tnlf'k;,�u.4a�l s'L'2'c'enaSK'3±ftaiu'iitis. 4,"0 4114+1 �t�,'� .. .;i3���i�sY:ri#S�a�.�t"saa,�s:> �; i��l+ S% l�di�: r` .i•,� ".� "k$;irsstuaah.�..'hS�s� a .SGa�`1t�::r:� � ?3.;ie�. w��.�r d z fie W J U` UO; W; W =: O IL _• (v _ ..51• 11■.! Zo:. 2 5: U 0. O {- ,w W, _ o • . Z' z City of Tukwila Department of Community Development HEARING DATE: NOTIFICATION: FILE NUMBER: APPLICANT: OWNER: REQUEST: LOCATION: ASSOCIATED PERMITS: John W. Rants, Mayor STAFF REPORT TO THE CITY COUNCIL PREPARED SEPTEMBER 28, 1998 October 5, 1998 Steve Lancaster, Director On July 10, 1998 Notice of Application was posted and mailed to surrounding properties. Notice of Hearing was posted and mailed to surrounding properties and mailed to the Seattle Times for publication on September 18, 1998 L98 -0034 - Unclassified Use Permit Highline Water District Highline School District Unclassified Use Permit approval for the installation of a 7.6 million gallon underground water reservoir Crestview Park, 16200 - 42nd Ave S. Demolition Permit (MI 98 -0168) Land Altering Permit Development Permit SEPA DETERMINATION: Determination of Non - Significance made by Highline Water District, as SEPA official, on March 25, 1998 COMPREHENSIVE PLAN DESIGNATION: Low Density Residential (LDR), with Public Recreation Overlay ZONE DESIGNATION: Low Density Residential (LDR) , with Public Recreation Overlay *STAFF: Michael Jenkins 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • 1206) 431 -3670 • Fax (206) 431-3665 %...40m 3Y,ofg• t' . "- Rl�.n'icxu`Fa°2epia.Ln'itur iti'onterieakvOi v :w`�rS i{fib'fkY. ieti.Yrx sr i<'e' ia''C',ttw�be� Staff Report to the L98 -0034 Highline Water District -16200 - 42nd Ave S. City Council ATTACHMENTS: A. Outreach materials for SEPA review from January 14, 1998 public meeting B. SEPA Checklist, with Determination of Non - Significance C. City's response to SEPA checklist D. Highline Water District responses to Unclassified Use Permit application E. July 22,1998 Public Meeting information materials F: Vicinity Map G. Sheet Index H. Site Plan I. Grading Plan J. Reservoir Section K. Landscape Plan L. Aerial View looking south M. Photosimulation looking south N. Aerial View looking east O. Photosimulation looking east P. Public Comment from City of SeaTac dr, •:,4;ltdaiU.N.a. , id. h, 3 ,. in.:, .rig:; .'w'tv,:itc iza l; • .nb��'iS,�.YaEt$ ait'. r; 4::::. ts. G'; 3C<:, ii��r. �; �„•: iiSi�' S�4.`, a, urr:. 2: f+ s'+ d::. i�:. i., v,; i+ Kr• n' Y% �>. �. m' wr: l: ?: ?a !s "�- ��a:�3] >:`- tix,�i,�i�* °� ., Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. FINDINGS Vicinity /Site Information Project Description The Highline Water District is seeking approval of a 7.6 million gallon underground reservoir at Crestview Park, 16200 - 42nd Ave S. The two phase project includes the demolition of the vacant Crestview School followed by the installation of the reservoir and restoration of the portion of the park disturbed by the construction. 'The reservoir will include a piping system to link to the Cedar River Pipeline Number 4, which runs west -east on S. 160th Street. z re 6 C.) O: 1 (0 w =; J CO Li- wo 4a Existing Development LL <^. zd`. The site is occupied by Crestview Park and the vacant Crestview School z E-o Surrounding Land Uses 11.1 ?i n The surrounding properties are all zoned Low Density Residential o u) is w uj Background x v, o Highline Water District, as the SEPA agency with jurisdiction over the project, held an Iii c Open House on January 14,1998 to provide information on the scope of the project and H '-: answer questions concerning the impact on the neighborhood. Attachment A is a copy of the materials available to residents and other interested parties that were presented at this meeting. On March 25, 1998 a SEPA Determination of Non - Significance was issued, with a month long comment period to allow for further public input. Attachment B is the SEPA checklist and determination. Attachment C is the City's response to the SEPA determination made during a 30 day comment period. The City of Tukwila currently leases a portion of this site, which is owned by the Highline School District. The portion of the site which is occupied by the school is not currently part of the area leased by the City of Tukwila for Crestview Park. Future discussions, review and negotiations for amending the lease to include the 'school' area of the site as part of Crestview Park would occur following a multi-phase process including public review and comment, all of which are outside the scope of review of this Unclassified Use Permit application. 3 :: u : -1 u r 4d3 9i414v.4:v4441s4.0. -e tz*F ea. 1+. 10 A:, 0.4f c ".. 7. c ?44:N « ell Staff Report to the City Council Review Process L98 -0034 Highline Water District -16200 - 42nd Ave S. Under TMC 18.108.050, a public meeting is required for Unclassified Use Permits at least 5 days prior to the end of the initial public comment period. Notice of the application and the public meeting were posted and mailed to surrounding properties, w as required under TMC 18.104. The required public meeting was held on July 22,1998 6 at Foster High School. Representatives from Highline Water District and their o consultants attended as well as City of Tukwila Staff. Attachment D is a copy of the { N w. Unclassified Use Permit responses and supplement submitted by Highline Water F-; District. Attachment E are handouts prepared by City of Tukwila staff and provided at co the July 22 Public Meeting." Type 5 decisions require an Open Record public hearing before the City Council. N Following the public hearing, the City Council "shall render a written decision, W including findings of fact and conclusions, and the Department (of Community z /—' Development) shall promptly issue a Notice of Decision pursuant to TMC 18.104.170 ". z o Type 5 decisions are only appealable to Superior Court. w n o. Unclassified Use Permit 0 0 H: = to The proposed project must conform with criteria detailed in TMC 18.66.060: �-- �O (1) All facilities shall be undergrounded when possible . Attachments F - J include the Vicinity Map, Sheet Index, Site Plan, Grading Plan z and Reservoir Section. The reservoir will be located underground. The top of the reservoir will be approximately 2 feet below ground and will extend to a depth of approximately 40 feet below the surface. Piping between the reservoir and the Cedar River Pipeline on S. 160th will also be located underground in an easement between the northwest corner of the reservoir and S. 160th St. (2) The proposed use will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity; The applicant's have indicated that undergrounding the reservoir and restoration of the park will ensure that it will not be materially detrimental to adjacent properties or the public. As part of the review process, the applicants submitted copies of a preliminary geotechnical report prepared December 22, 1997 that address the field explorations at Crestview Park. The report, which included information on subsurface conditions, construction, excavation and related issues has been reviewed by staff. The final report will be required on submission of a development permit, if the use is permitted by the City Council. 4 Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. Applicant's have indicated that the following safeguards have been factored into the reservoir's design, including: • Backup inlet control valves • 2 hour storage capacity if primary and backup valves fail • Water transfer plan to divert water to other Highline facilities • Overflow line to Tukwila stormwater system • Zone 3 Seismic Design z �z ct w U: 0 N 0 �w w =: Jam, Phase One of the project, lasting approximately 3 months, calls for the demolition w o of the vacant 27,000 square foot Crestview School, removal of asbestos prior to demolition and removal of underground oil tanks and septic tank system. The E a. applicant has applied for a Demolition Permit, currently under review by all co d' pertinent City Departments. No other land use permits are required prior to approval of the Demolition Permit, as the SEPA review has been made by ? '' Highline Water District. w o; w As indicated in the site plan, 6 foot security fencing will be installed around the a 0 demolition area. Access to the park from 42nd Ave S. will be limited to 0 H construction vehicles only. During the process to remove the school and related x v. underground tanks, the area of the park where the school and affected grass area L.L. o' are located will also be surrounded by security fencing. w z to 1-_ Phase Two of the project , lasting between 9 -12 months, will begin following z / demolition of the school. The grass area where the reservoir will be installed will remain behind security fencing. During construction, an erosion control plaa will be implemented and a mitigation plan to control construction noise, in support of the City's Noise Ordinance (TMC 8.22), will also be implemented. While the parking lot adjacent to the grass area will remain closed during this phase of the project, the turn around area for the school used during Phase One as parking for construction vehicles will be made available to the public for parking. This parking area will be linked to the non - affected portions of the park through a paved trail. The applicant's have not provided specific information on how the public will be informed of reduced park access, method of signing right of way for changed access, available parking areas, park access during Phase 2 construction and when potential road closures will occur. 5 Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. (3) The proposed use shall meet or exceed the same standards for parking, landscaping, yards and other development regulations that are required in the district it will occupy. Attachment K is the landscaping plan showing conditions after the facility has been constructed and the park area affected by the construction has been restored. Attachments L - O are aerial photographs looking south and east and corresponding photosimulations generally approximating conditions that will exist after completion of the project. The trees and shrubbery proposed for removal are not located in a protected slope in excess of 20% or other sensitive area as defined in the City's Sensitive Area Ordinance (TMC 18.45), so a Tree Permit (TMC 18.54) is not required. z W`. CL U: UO CO (n w • = CO a_: w O. g - As a result of the project, the following elements currently present in the park d; w. z� HO • Grass Area z 1-: • Asphalt path around park o` • Shelter - moved away from parking area to northeast portion of grass area .8 in- Parking • area ` • Uncovered picnic benches = v' LI o` wz U.co, 0 z will remain: The following elements will be added: • A six foot Cedar Fence along the west property line, with Oregon Grape planting on the park side of the fence • Retention of some existing evergreens adjacent to the west property line, with addition of new Douglas Fir • Groupings of Austrian Black Pine adjacent to retained existing trees • Planting ring of Redleaf barberry adjacent to asphalt path • Planting ring of Jacquemontii Birch outside of Redleaf barberry ring • Norway maple near parking access and adjacent to parking lot • Euonymous and Cotoneaster adjacent to new 2:1 slope to aid in slope retention • Planting of Bearberry shrubbery between grass area and asphalt path adjacent to parking area • Planting of Red Maple on south and east side of parking area, with additional plantings of Arborvitae and Rockrose • Reservoir Vents • 6' by 8' reservoir access hatch • 4' by 3' reservoir access hatch • Permanent irrigation for the grass area • Bicycle Parking 6 Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. Existing on -site parking adjacent to the grass /reservoir area will be restored following construction. The parking lot will be re- configured slightly from the existing parking area, but the impervious surface area will not change and will continue to have 15 spaces. Two parking spaces meeting the Washington State Barrier Free Code will be included. (4) The proposed development shall be compatible generally with the surrounding land uses: The surrounding land uses are primarily single family residences. The facility is located with a Public Recreation Overlay zone, as defined in TMC 18.42. The project will result in the removal of a vacant school that no longer serves residents and has a history on complaints from surrounding property owners concerning vandalism and being "an attractive nuisance ". Applicant's have indicated that the area where the school was sited will be grass seeded following its demolition. During project construction there will be an increase in traffic to the site due to construction vehicles. The bulk of the construction trips will be on City of SeaTac streets, as confirmed in Attachment P from the City of SeaTac, and along 42nd Ave S. to the park entrance. The portion of 42nd Ave S. that begins at the City of Tukwila, near S. 164th St. to the park entrance is approximately 3 blocks. (5) The proposed use shall be in keeping with the goals and policies of the Comprehensive Land Use Policy Plan The following are applicable goals and policies pertaining to this project: Goal 1.10 - Open Space Network Policy 1.10.7: Work with public agencies to incorporate public spaces as an important element of major transportation, utilities and facilities projects Upon completion of this project, the existing park are will be restored, with new landscaping, a new shelter and irrigation for the grass area. The school portion of the site will be seeded for possible new park facilities, following City Council review and concurrence on revising existing leases with Highline School District and following public input. Y.4:dmF.ra■64.1 .au._..,.... • 7 lamcitancedgIIMMM • Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. Goal 3.3 - An improved housing stock in support of enhanced neighborhood quality Policy 3.3.3: Ensure that residential neighborhood infill and redevelopment is not hampered because of inadequate water, sewer, storm water management, and streets The facility will not impact levels of utility and transportation service in the neighborhood. The facility is designed to provide for additional water service and capacity for Highline Water District customers, from which the surrounding properties currently 'receive water. Goal 12.1- Utility services and facilities that meet the community's current and future needs in a safe, reliable, efficient, economic and environmentally responsible manner. Policy 12.1.34: Actively coordinate project implementation with individual utilities based upon Tukwila's Comprehensive Plan and development regulations Highline Water District has met-with City of Tukwila staff to ensure appropriate levels of service for their residential customers. Ordinance 1816 was adopted on November 3, 1997 to allow water utility reservoirs as essential public facilities in Low Density Residential zones, subject to approval of art Unclassified Use Permit. A pre - application conference with Highline Water District staff and City staff occurred on December 18, 1997. Policy 12.1.36: Encourage utilities to consolidate facilities and minimize visual impacts of facilities where technically feasible Policy 12.1.38 : Utility services within the City shall be undergrounded based upon the Tukwila Comprehensive Plan and development regulations The reservoir will be undergrounded. Some visual impacts will occur due to the loss of trees along the northwest portion of the park. The area will be landscaped with a retention of some existing trees and a combination of fencing, shrubbery and new trees, as indicated in the attached landscaping plan. 8 MI I Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. (6) All measures have been taken to minimize the possible adverse impacts, zvhich the proposed use may have on the area in zvhich it is located. The evergreen trees to be removed in the northwest corner of the park are indicated in the site plan and grading plan (Attachments H and I). According to the applicant and their representatives, the removal of the trees are necessary to accommodate the excavation and construction area for the reservoir. As referenced in the Landscape Plan, fencing and landscaping have been installed to provide visual and physical barriers to the residences directly affected by removal of these trees. (7) For uses in residential areas demonstrate that there is no reasonable alternative site for the use: As part of their application and SEPA review, 5 sites were originally identified in a siting survey, of which 3 were acceptable. According to the applicant's the Crestview site was chosen due to the required size of facility, site constraints, location of water sources, hydraulic requirements, environmental concerns, cost and permit requirements. The majority of the uses served by Highline Water District in the City of Tukwila are residential. While the proposed location is located in a residential zone, it is on a parcel that is a non - residential land use. (8) For uses in residential areas demonstrate that the use provides some tangible benefit for the neighborhood: The reservoir will serve the Highline Water District and residential customers within the City of Tukwila. The project will result in the removal of the vacant Crestview School and the removal of an abandoned septic tank and underground tanks originally used to store oil for heating the school. The installation of the reservoir and restoration of the park are will include a new irrigation system for the grass area. CONCLUSIONS In review, the applicants have proposed a 7.6 million gallon underground reservoir in Crestview Park. The construction of the reservoir would occur in two phases, beginning with the demolition of the vacant Crestview School. Following the installation of the reservoir, the area of the park disturbed by the construction would be restored. 9 .s... •xir...:tisi:a is:.a�ain i:v'i:ii i} "u 'T1i�:l;:di.4:^:.''�:rr'r 'e� 'ts; ,y! -- ,..a_•tw::,u� -k art,., .;r •u-•:v. :wcv,v..:..m�c., ew z ir-. w mo. 2 0 00 w= F-. w 0' =a w z 1- 0 z U� :0 -; 0 1-• =0 Liz f= O 0 z xa Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. Crestview Park is located on a parcel owned by the Highline School District. The City of Tukwila leases a portion of the parcel for Crestview Park. The removal of the school will create an area on the site that could be used as additional park area. This unclassified use permit covers only the portion of the park area affected by the installation of the reservoir. Any potential increase in Crestview Park would occur following negotiations between the City and Highline School District and a public review process for input on additional park elements. (1) All facilities shall be undergrounded when possible The reservoir and supporting infrastructure meet this requirement. (2) The proposed use will not be materially detrimental to the public welfare... The preliminary geotechnical review and related safety information reviewed by staff appeared adequate, but will be reviewed in greater detail on submission of construction drawings. Removal of the school will remove a long - standing nuisance. The construction plan ensures that some access to all open portions of the park will be maintained through the bulk of project, however a public information plan on construction and park access should be provided. All construction activities must comply with the city's Noise Ordinance. (3) The proposed use shall meet or exceed the same standards... No tree permit will be required, as the project is not located in a regulated sensitive area. Irrigation for the grass area will be installed to ensure long term viability. On -site parking will be restored to previous level and will be improved from existing parking. New landscape areas are appropriate to use of site, provide visual interest, allow for screening of adjacent residences and provide slope stability adjacent to the new slopes created by the reservoir. The construction of a shelter will maintain recreational opportunities for the park and will be in a more desirable location away from motor vehicles. Please note that the landscape plan only covers portions of the project that fall under the area of the site leased by the City from Highline School District for Crestview Park. No specific landscape solutions for the area of the former school have been included, as this portion of the site does not currently fall in the 'park' area. The applicant has shown that the area will be grass seeded. Any specific solutions regarding park elements for the former school area would be developed following successful lease negotiations with Highline School District and public outreach to stakeholders to determine appropriate park elements. 10 St. RIV1 Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. (4) The proposed development shall be compatible generally with the surrounding... The facility should not be incompatible with the adjacent residences as it will not be visible. The removal of the school will improve the utility and desirability of the existing park portion of the site. The bulk of the trips associated with the project construction will occur on streets outside of the City of Tukwila. (5) The proposed use shall be in keeping with the goals... The removal of the school provides additional opportunities to expand the Crestview Park, following negotiation and a public process to define appropriate park elements. The facility will provide additional - development opportunity in Tukwila for Highline Water District customers. (6) All measures have been taken to minimize the possible adverse impacts... The removal of the majority of the trees appears to be required for completing the project, however some retention of the trees will occur. additional trees will be planted in a decorative fashion on the edge of the grass area. More naturalistic tree plantings will occur between the grass area and the nearby residences to re- create some of the existing park elements that will be lost -as a result of this project. (7) For uses in residential areas demonstrate that there is no reasonable... The applicant is providing a non - residential use in a residential zone which will provide added services for both existing and potential residential and commercial development in Tukwila and the Highline area. The siting of the facility is appropriate for this neighborhood as it is underground and will serve additional housing in the area. (8) For uses in residential areas demonstrate that the use provides some... The reservoir will provide additional capacity for the area. The removal of the school and related equipment will improve the quality of the neighborhood and this park. The removal of the school provides additional possible park facilities for this area. The addition of the irrigation system will improve the quality and utility of the park. 11 avax;, avail C.. 5 1.' ,e.; 4414. si Y } F: ' '•' I i oie + r. n Staff Report to the L98 -0034 City Council Highline Water District -16200 - 42nd Ave S. RECOMMENDATIONS As the quasi-judicial hearing body on this application, the City Council has three options: 1. Approve the application 2. Approve the application with conditions 3. Deny the application Based upon the documents submitted by Highline Water District in support of this application, and as reflected in this report, staff recommends that the Unclassified Use Permit be approved with two conditions: 1. A public outreach plan must be submitted and approved by the Department of Community Development prior to the issuance of a Demolition Permit for removal of Crestview School. This plan shall include information on how the neighborhood will be notified about the construction schedule and related construction activities, potential road closures and solutions that address limits to park access. Because the applicant does not own the property affected by this proposal, the applicant must negotiate with and receive written approval and agreement from the property owner, Highline School District, and the leasehold interest owner, City of Tukwila, regarding their respective property rights, obligations and responsibilities. It is expected that these negotiations will be completed prior to the issuance of a Development Permit. y• 12 ATTACHMENT A Hignline Water District Open House Information Presented by the Highline Water District Introduction The Highline Water District is beginning the preliminary design of a 7.6- million -gallon water reservoir. The reservoir will provide needed water storage to Highline customers and meet peak demand requirements as early as the year 2000. As part of the predesign, the District is holding this Open House to ensure that the surrounding property owners, District customers, and the affected agencies are aware of the details of the proposed improvements. It is also important to the success of this project that the District understand the concerns of the property owners, customers, and the affected agencies. The conceptual design as presented today for the proposed improvements is based upon the information known at this time. As the project progresses and additional information becomes available, details of the project will change to some extent for the final design. Proposed Improvements Reservoir As shown on figure 1 the District anticipates locating the 7.6- million -gallon reservoir in the northwest corner of the Crestview Elementary School property. The owner of the property is the Highline School District. The Tukwila Parks Department has leased portions of the school site for beneficial park use by residents of the City of Tukwila. The location of the reservoir is based on preferences expressed by the Tukwila Parks Department. As other comments are received, there is potential that the reservoir's location may be shifted somewhat to the east. The reservoir shown is 200 feet in diameter and is anticipated to be 40 feet in depth. The diameter of the reservoir could be enlarged to approximately 250 feet, allowing a reduction in the depth of 13 feet to a total of about 27 feet. The excavation area required to construct the reservoir will require removal of most of the trees in the northwest portion of the property, except for the buffer shown. After construction, the reservoir would be covered with approximately 2 feet of earth and topsoil and then revegetated/landscaped to meet both Tukwila Parks and School District requirements. As part of the reservoir project the existing Crestview School building will be demolished. The school area will be graded for appropriate drainage and replanted in grass. Pipelines Water supply pipelines for the reservoir will be constructed from a new pump station. The pipeline will be located in the South 160th Street right -of -way. A traffic control plan will be implemented to minimize impacts to local property owners along this pipeline route. The District will also provide a drainline and overflow for the reservoir. The details for these lines have not yet been developed. Your input to this project is very much appreciated. Please contact Mr. Keith Harris at the District if you have comments or questions that are not resolved at the Open House today. z Wiz: w .J U: 00. to o. w= N w O; 2 J w =: = F- w = • z� 0. zI UU ,0 , • ,o I-. • w • LL H, O LLi z • U N' z Highline Water Dis tri--4 Reservoir Restoration Plan Proposed Retrieve It ;44:1,1 ?;s s YArgrl '" ' Legend JAsphalt Grass RapireCTINO ! I Rsp/ac oent Ares Arse Proposed () Tree 3 t 1,9 Proposed ��! Contours • • --, High lin a Water Dis trW Reservoir Construction Area Plan .`,,.,1,..... [ i.L�.' __ , �.N L. .,�S.-" ^+_: ..4.Ly ,4ti„•-- _ — <.._..: .� \- T - y.: l... t._.1 <7` -. . . '�Y' -:�. � .v �r w•� ~ :1 ,. i, : i, , •-v. �uttr Ar = s 1: i ,SI1 _. i S r ` i ^170+ •r...;n•...".'“.07. s `‘ \ \ .,j ' .'•947 •�._- •�`t- ....... 1 t 1 r"T) 1 \ 1 u; 'k ." fry \�1*.o ...' •-t ft,...:. r\ ,f %. Approximaitr 1 � ~��'i•.� \ {11���•' ��{ .•!6! ",J'�. n'• ..n^ysi mil` `_ 4. 1 3, �'r• ! 1 1 • F no4 Prloper& L. proposed ROINIVOW Legend _.. _._ Exb "a .. Conte tiatts ....� €'- v" ri ,c3'4: 4<: a1.' i!' sC: >,f.:'l4a':��f•`i�.M.. �. p,n.v3i' maosacgansamstis Highline Water District Reservoir and Pump Station Flow Schematics EL560 Existing Bow Lake Reservoir New Overflow .4— Alternative 1 System as Proposed in Siting Study Seattle CRPL 14 Altitude Valve INNER 11■1. EL 470 New Reservoir EL 440 New Pipelines (241 New Pump Station 10,000 GPM I Existing Crestview Pump Station Currently being Upgraded • Existing L Flow Meter Alternative 2 Locate New Pump Station at New Reservoir New Seattle Intertle and Flow Meter New Overflow New VaIv r_ VMS =IMP New Control Valve 11 (normallyopen, close periodically for res ervoir circulation) (normally open) New Pump Station 10,000 GPM —4-- Seattle CRPL 14 — New Existing EL560 Existing Bow Lake Reservoir EL 470 New Reservoir EL 440 Altitude Valve New Valve (normal Word) Existing Flow Meter New Pipeline (24') Existing Crestview Pump Station Currently being Upgraded I Control Valve 11, (non:wiyclosed) . Ur- 'Sios1tr'7�fu` Compaison to Alternative 1 ; ( +1 Lower Capital Cost Less Pipe Lower Power Cost ( -) Requires Second Seattle Intertle New — Existing Z W � 0•0: ,Co W LJJ •J �. N LL: Ili O J LL Q 22 D. = d: L_ w _•. O' Z H: 1:;) ON.. Wuit •LL O, Z O I' z 44,144: • .kl4 r:r�F; `,;�" l�'� ��, �: y;, rJr�;" 2H' �t, rnst.?!is�,�±.5�!•%'cSXr�,��?r}; ..•: }., rr + .;;;�y emu., 0 1 N 0 .47-1 +-r N 0 E E O 4- O i o (13 u w N CI c c O a O d J ra'9ti, prOlt- M!s?.z°`, 4r;r:ljr o:YV'.y ht ;w. s, yl;rtii lt; l.ymz: ;Cr. nkiry,4y, tic'- "M'ly,,1 .;. may;`,' ,. �c.k2s..y,.T 0 pica) Loca Pump Statio Z I=— Z JU 0 U O U W J = U LL WO J LL U Z d W Z I— O ZI- W Lij U O — O F- LU ui I— I--- u' O Z W U= 0 Z Of Of m Of a 0 N a a O a N a a 1 a 0 0 0 u� 0 0 m r a 0 1.0 0 0 a 0 N m E m z N H m C ` a [lo E E Rolled Up Task Rolled Up Milestone 0 M I0 t0 ti CO Of • r. n:+ r': xr;. rn. s�i%: �<: riNr:;, �t. �' iti° �i�` h�: FU''.t�:a,�r.+`.^,'s�+ ;' ±isuti?" ::�:::a5:,ii= :kize�,im z' Z' W 6� U 0∎ 0) CI U) 11J W I t J CO LL, W 0 LL <, N d = ur ZOO '0 U;. 0 I- w w'. H W 0, z. U= 0 z c QTY.7.b:4n'ai.4¢YaVe= i. ve!tvt* :,t mtf3?!.Wr ENVIRONMENTAL CHECKLIST TO BE COMPLETED BY APPLICANT A. BACKGROUND 1. Name of proposed project, if applicable: Crestview Reservoir 2. Name of applicant: Highline Water District (District) 3. Address and phone number of applicant and contact person: Applicant Keith Harris, P.E. Manager, Planning/Construction Highline Water District 23828 30th Avenue S Kent, WA 98032 Phone: (206) 824 -0375, ext. 142 Contact Tom de Laat, P.E. Design/Environmental Project Manager Parametrix, Inc. 1231 Fryar Avenue Sumner, WA 98390 Phone: (253) 863 -5128 4. Date checklist prepared: March 24, 1998 5. Agency requesting checklist: Highline Water District 6. Proposed timing or schedule (including phasing, if applicable): It is estimated that demolition of the school would start in the summer of 1998. Construction of the reservoir, metering station, and piping would commence in the fall of 1998, provided all permits are secured. It is planned for all construction and restoration of the site to be completed by January 1, 2000. RECEIVED Highline Water District Crestview Reservoir 1 MAR 31 '1998 COMMUNITY i`.1"4a'V k :z to eaui ay.iiirS, ic:4 -4:9 4: ;s ' e4vEr -:.:iiii�:s•^eR+Y�'1:;9,E:na; `:iR a <k:.ie :,C "'•...`,: o �' im 21- 2714 -01 March 25, 1998 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. The Highline School District has indicated that at some time in the future a new elementary school may be constructed on the site. A pump station may be needed in the future and it is likely that the pump station would be located near the reservoir site. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. z QH ~ uJ 6 J U 00 wX J H. wo A preliminary geotechnical reconnaissance was performed that included soil borings and soil samples (Landau Associates, Inc. 1997) and a technical memorandum was produced. A Phase I a Environmental Site Assessment was performed for the Crestview Elementary School (Geo Group, a. 1997). w x1.- 9. Do you know whether applications are pending for governmental approvals of other z o W al There are no known applications pending for approvals of other proposals that would directly 0 o I- w W' • V 10. List any government approvals or permits that will be needed for your proposal, if .- z U N: z proposals directly affecting the property covered by your proposal? If yes, explain. affect the project. known. City of Tukwila • Unclassified Use permit • Demolition permit • Tree. Cutting permit • Load Hauling permit • Mechanical permit • Sewer permit • Land Altering/Grading/Preloads permit • Building permit • Franchise Utility permit • Storm Drainage permit • Street Use permit Other Agency Approvals Puget Sound Air Pollution Control Agency • Notice of Intent to Perform Asbestos Removal and Demolition Washington Department of Labor and Industries • Electrical permit Highline Water District Crestview Reservoir .r. tta L.1e:1.,,ws6helktf>.za':6 a4:.trA'Z:twra'.•.�''k"3�3'''°, 2 21- 2714 -01 March 25, 1998 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) Purpose The purpose of the project is to construct a water storage reservoir at the Crestview Elementary School site (Figure 1) to increase the water storage capacity in the Highline Water District and serve future peak demand requirements. The project may also provide additional capacity to help serve the demand in neighboring water districts. The project consists of several components including demolition of the existing Crestview Elementary School buildings, construction of a 7.6 to 8.1 million gallon reservoir, installation of a new metering station and hookup to the Cedar River Pipeline #4 (CRPL #4), and construction of potable water fill and draw pipelines to the reservoir and drain/overflow lines (Figure 2). Elementary School Demolition The existing Crestview Elementary School buildings would be demolished as part of this project. Demolition of the school is a requirement of the Highline School District as partial compensation for an easement to construct the reservoir. Demolition of the school would also provide an area for the contractor to stockpile excavated earth and store construction supplies and equipment. Demolition of the school would meet all regulatory requirements for asbestos removal, fuel tank removal, structure demolition, and utility abandonment. The parking lot on the west side of the school would not be removed as a result of this project. It is anticipated that restoration of the school site would consist of grading the area, covering it with native sand taken from the reservoir excavation site, and hydroseeding. The City of Tukwila Fire Department has indicated a desire to burn the school in a controlled manner as a training exercise. It has not been determined if this request would be allowed. Water Storage Reservoir The proposed reservoir would have a water holding capacity of 7.6 million gallons. The District is considering a possible enlargement of the reservoir to provide a water holding capacity of 8.1 million gallons to joint use by other interested water districts. The reservoir would be constructed on the northwest corner of the project site. This area is currently leased from the Highline School District by the City of Tukwila and used by the Tukwila Parks Department as a city park, play ground, and little league baseball field. A 200 -foot (or smaller) diameter tank would be constructed with a new metering station and rely on CRPL #4 water pressure (instead of a pump station) to fill the reservoir. A larger diameter reservoir was initially considered to lessen the depth of excavation. It was concluded, however, that the 200 -foot diameter tank with a greater liquid depth (32 feet) than the larger diameter tank would be easier to fill using the pressure available from the CRPL #4. The actual tank diameter would be determined during final design. Highline Water District Crestview Reservoir `YT: aF 144=l�'�'�1-,V. tieze 3 21- 2714 -01 March 25, 1998 Parametrix, Inc. ti. S161stSStN csa J Reservoir Site at Crestview Elementary School i Hrohn. 'u*TE: 03/25/98 Figure 1 Vicinity Map 4 ��':a'.a�a;;;;;�a';i:t3;rtF �'�zx' "`rG:c�ti'^ sy'';'{,'a�:i'L'`i ",r .;�.. ii>,' •:,�:" :r. ±;F' ;r't " :'�..i5' °t;3: s. �,'s ' s;r3:i':' ;:�.• F�,., �,,:,.r„ - ..�r,.��.s•,5�.,r:,.0 d _. .. �, .ii+w. -;a+,...fMh Aso d' kfY`K•, .rd+�.� r,`s .�;� �. w�S.f'x a �n,,7F.f'8i�.... , Via'?• . As %a �e. �dw�xr., '�t....:c,��.,.,brx.:f:! §r�'�it Z: r, w2 JU UO.: t co • Z•: W }• O, J' LL cn a Z �. Z H, o; ov' w = V- I-- - O. u z tA i` 0 z m Drawing# • ) Should the District proceed with the additional 0.5 million gallons to provide storage capacity for other districts, the reservoir diameter would be 200 feet and the tank water depth would increase by 2.1 feet. Assuming the reservoir at 200 feet in diameter, the total depth of excavation would be approximately 40 feet with temporary side slopes at 1:1. The bottom of the excavation would be 220 feet in diameter to allow 10 feet of working space around the base slab of the tank for concrete form work and access. The bottom of the excavation would be shored a minimum of 10 feet in height to provide worker safety and slope stability of the excavation. The contractor may elect to over excavate the south side of the site to develop a ramp access to facilitate removal ,of excavated earth and provide better access to the bottom work area. The reservoir would be concrete and it is anticipated it would be constructed of precast, prestressed, and post tensioned panels to eliminate cracking and possible reservoir leaking. Precast panels would be constructed at a manufacturing plant and assembled at the reservoir site, thereby minimizing the amount of construction and time of disturbance on -site. The roof system is anticipated to be precast T -beams or cordslab construction which would also minimize the amount of onsite construction and disturbance to the surrounding neighborhood. Alternative methods of construction such as a cast -in -place concrete may also be feasible. The reservoir would be covered with approximately 2 feet of earth and/or top soil. On the south side of the tank, the earth cover may be deeper to blend the soil cover into the existing ground surface. Surface water would be directed away from and/or off of the top of the reservoir. It may also be appropriate to incorporate a sand layer over the reservoir top with an underdrain system to direct surface water to the outside edge of the reservoir. Based upon the absorption rate of the native sandy soil, it is anticipated that surface water would rapidly infiltrate into the ground and remain on site. Metering Station Based upon historic operational statistics and projected demand on CRPL #4, the District's existing metering station on CRPL #4 for its Crestview Pump Station is about 1,100 feet downstream (west) of the proposed reservoir. System head loss in CRPL #4 to the downstream location reduces available pressure at that location insufficient to fill the reservoir at the Crestview Elementary site without pumping. By placing a new metering station at the elementary school access to S 160th Street, pumping can be eliminated. It is likely that the pipeline would fill the reservoir without the assistance of a pump station. The new metering station would simplify construction of the conveyance pipelines along S 160th Street, because only a single line would be needed (a double line would be required if a new pump station was constructed). It may still be necessary to construct a pump station in the future depending upon system demand changes in both the District and the CRPL #4. Highline Water District Crestview Reservoir 6 21- 2714 -01 March 25, 1998 Potable Water Line and Drain/Overflow Line The potable water pipeline connection of the new reservoir to the existing District distribution system would be 30 inches in diameter. The single water line would be constructed west along S 160th Street and connect to an existing 24 -inch line near the existing Crestview Pump Station. The reservoir will be provided with a drain line to allow drainage of the tank, and flushing if needed for maintenance. The overflow is needed as an emergency backup measure to safely dispose of water in case of a failure in an "open" position of the inlet control valve. The existing downstream public storm or sanitary sewer lines do not have sufficient capacity to accommodate all of the potential water volume that could be generated from the reservoir overflow line. The District is currently evaluating several alternatives for the overflow /drain line including (1) use of the return line for pressurized overflow into Gilliam Creek, (2) use of a dedicated gravity feed line for overflow into Gilliam Creek and (3) discharge to the street section at the northwest corner of S 160th Street and 42nd Avenue S. Under the first alternative, a solenoid valve located adjacent to Gilliam Creek would operate the overflow line. The valve would operate on a signal from the reservoir and open the valve discharging water to the creek. Under the second alternative, a dedicated overflow would be constructed from the reservoir to the creek. If the reservoir became too full it would spill into the line and water would discharge to the creek. The third alternative would be to discharge to the street. It has not yet been determined what method of conveyance would be used to direct the water to Gilliam Creek. Possible methods of conveyance include the street section itself, use of the existing or a future storm sewer system with partial flow within the street section or conveyance within a pipeline sized to handle the overflow event. Regardless of the overflow /drain option, the District would install second order or greater redundancy on the incoming supply line to eliminate or reduce the risk of an overflow. Inlet control redundancy would be provided through a series of valves which would close upon receiving a high water level signal from the reservoir. Other Design Features Inlet control devices would be provided to stop the flow of water into the reservoir when it has filled to its normal operating level. Redundant control device(s) would be installed to assure that water supply into the reservoir would be stopped even if the first control device should fail. A vent is required from the top of the reservoir to allow the exhaust and intake of air as the water level in the reservoir fluctuates. Venting may be accomplished using single or multiple vents. Vent(s) may consist of goose neck piping at the highpoint, a goose neck along the side of the reservoir connected to the highpoint by underground piping, or possibly a vent incorporated into a park structure or reservoir accessway. Highline Water District Crestview Reservoir 7 21- 2714 -01 March 25, 1998 z tv ~ w re. 4c 00 co o to w. J co w w 0. g a: e.a �w z�.; � 0 Z E- 0 o. 0 co o 1- ill IQ- 0 Z I- LL - O wz U� 0~ z Access into the reservoir can be provided through a number of different methods. Accessways can be flush with the surrounding ground if provided with watertight and self draining hatches to prevent surface water from entering the reservoir. Accessways and possibly the vent apparatus, could also be incorporated into a small building built into the reservoir roof. Should a small building within the park open area be pumped, it would have to be approved by the school district and the parks department. A manway ladder would be provided for access to the floor of the reservoir. The manway would be located under the access hatch and would be attached to one of the roof cohrmns or on the side of the reservoir. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The reservoir site is located east of 42nd Avenue S between S 160th and S 164th Streets at 16200 42nd Avenue S in the City of Tukwila. The site is located in Section 27, Township 23 North, Range 5 East of the Willamette Meridian. TO BE COMPLETED BY APPLICANT B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other: Most of the site if fairly level except for the northwest corner of the site where the slope becomes steeper (see 1.b below). b. What is the steepest slope on the site (approximate percent slope)? The steepest slope on the reservoir site is approximately 25 percent. However, most of the site is fairly flat (under 5 percent slope). The steepest slope along the overflow line is approximately 20 percent. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. The subsurface conditions on the reservoir site were found to consist of glacial advance outwash material to depths of 60 to 80 feet below ground surface. The glacial advance outwash material mainly consists of medium dense sand that becomes very dense with depth. Some fine to medium sand with traces of silt and occasional fine gravel also makes up the outwash material. Highline Water District Crestview Reservoir 745+%6'.'1 T54ti it t' r'"31e• 8 MOtti 21- 2714 -01 March 25, 1998 d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. There are no surface indications or history of unstable soils in the immediate vicinity. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Excavation is needed so that the reservoir can be buried underground. Total excavation for a 7.6 million gallon reservoir would be approximately 66,000 cubic yards. Approximately 46,000 cubic yards of material would be excess and removed from the site. Approximately 20,000 cubic yards of material would be stockpiled and later used as backfill around the reservoir. Material used for backfill would be stockpiled where the existing school is now located. The total excavation for a 8.1 million gallon reservoir would be approximately 70,000 cubic yards. Of this amount, 48,000 cubic yards would be excess material and 22,000 cubic yards of material would be stockpiled and later used as backfill. Fill material would be required to backfill the excavated area not filled by the water reservoir tank, to provide cover material over the tank and to provide suitable surface soil to reestablish vegetation. Approximately 3,000 yards of fill associated with modifying the existing topography would be required. The source of the fill would be the native material taken from the reservoir excavation. New topographic contours would be blended into the existing park features. Grading would be needed to achieve final topographic grades to blend the reservoir into the park and restore the school site. Native material from the excavation would be used to grade over the reservoir as well as the school site. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Erosion could occur as a result of excavation and ground clearing for on -site and off -site improvements. However, construction best management practices (BMPs) would be used to control erosion. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The project would result in a loss of impervious surface at the reservoir site. The reservoir would be completely buried and covered with soil leaving no impervious surface. The demolition of the school will remove approximately 25,625 square feet of impervious surface. Highline Water District Crestview Reservoir 9 U:,} 1,3%', :4, 1 i1 ;#1 ia05 4,. ,.Y;itia:4gate,I;AV+ "•:t+31's+ '�ii�..Ltiin"• ?. , " 4a..0612 "%. n•$ "tiisu dSL`�: 21- 2714 -01 March 25, 1998 z wre 2. • o O. w= f-: W 0' u. Nd = 1— w� zF.:• 2D. 0 w w. .H 0 p; • wo • U N' O z h. Proposed measures to reduce or control erosion, or other impacts to the earth if any: A temporary erosion and sediment control plan (TESCP) would be developed for use during construction. The TESCP would utilize recognized construction best management practices. BMPs may include some or all of the following: preservation of the existing vegetation where possible, temporary seeding, mulching, graveling, fabric fencing, dikes, swales, subsurface drains, z' gradient terraces, etc. The actual measures would be included in the TESCP in accordance with wm permit requirements. 6 UO 2. Air U O = F- a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, U) '_ O odors, industrial wood smoke) during construction and when the project is completed? 2 If any, generally describe and give approximate quantities if known. g Q` D. Construction Emissions - Construction related vehicles and machinery will cause hydrocarbon .= W emissions in varying quantities. Emissions would be produced by automobiles, trucks, backhoes, .Z bulldozers, cranes, etc. Dust is also expected to occur as a result of grading and general z O excavation of the soil. w w There would be no exhaust of fumes or chlorine gas (chlorine gas would not be used or stored p N':. on the site). There would be air periodically exhausted from the reservoir vent. There could be w a slight chlorine odor in the immediate vicinity of the vent. However, there would be no health x v, risk from this odor. o, z b. Are there any off -site sources of emissions or odor that may affect your proposal? If 0 it so, generally describe. There are no off -site emissions or odors that would affect the project. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Excessive dust would be reduced by spraying water over disturbed soil areas. 3. Water a. Surface 1) Is there any surface water body on or in the immediate vicinity of the site (including year -round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. There are no surface water bodies in close proximity to the reservoir site. The nearest surface water body is Gilliam Creek which is located approximately 2,500 feet north of the reservoir site. Bow Lake and Lake Reba are located approximately 8,000 and 9,000 feet away, respectively. Highline Water District Crestview Reservoir 10 21- 2714 -01 March 25, 1998 O ~' z 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. Most of the project is not within 200 feet of any described waters. The construction of the overflow /drain line may result in work adjacent to Gilliam Creek depending upon the overflow /drain line alternative chosen. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. There would be no fill or dredge material placed in surface water or wetlands. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. No surface water withdrawals or diversions would be necessary. 5) Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan. The proposed project does not lie within a 100 -year floodplain. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. The proposal could involve a discharge of chlorinated water to Gilliam Creek. The volume of water that could be discharged through the overflow assuming failure of both inlet control systems would be approximately 10,000 gallons per minute. In the event of an overflow, there may be chlorine residual remaining in the water. However, the first line of defense for an overflow are redundant inlet control valves that would discontinue the flow of supply water into the reservoir in the event of a high water occurrence. The redundant valves would provide a second order level of safety to guard against an overflow occurrence. The overflow itself is a third order safety measure. If the reservoir must be drained, the majority of the water in the reservoir would be conveyed into the Highline Water District's distribution system. Any residual amount of water remaining in the reservoir may be drained into Gilliam Creek through the overflow /drain line (or into the street section). b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quantities if known. No ground water would be withdrawn and no water would be discharged to ground water. Highline Water District 11 21- 2714 -01 Crestview Reservoir March 25, 1998 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals ...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. No waste material would be discharged into the ground from other sources. c. Water Runoff (including storm water): 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. The only source of runoff would be storm water. Based on an evaluation of the infiltration rate of the native soil, storm water on the site would infiltrate rapidly into the ground (infiltration rates of 2.4 inches/hour in the upper 5 feet of soil and 8 inches/hour below a depth of 5 feet). With the tank buried underground, minimal new impervious surfaces and the sandy site soils, no significant amounts of storm water would collect on site or necessitate the need for storm water controls. 2) Could waste materials enter ground or surface waters? If so, generally describe. In the event of the reservoir overflowing through the overflow line, chlorinated water would be discharged to Gilliam Creek. Some of the chlorine in the water would dissipate as it moves along the overflow line. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: The reservoir is designed to have redundant safety systems to prevent an accidental overflow. 4. Plants a. Check or circle types of vegetation found on the site: deciduous tree: alder, maple, aspen, other X evergreen tree: fir, cedar, pine, other shrubs X grass pasture crop or grain wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other water plants: water lily, eelgrass, milfoil, other other types of vegetation Highline Water District Crestview Reservoir . fft =1L :�n�.�c':R&Aj-kV 12 1X41 iiNf.;s6:.:S' :: ?5iva e l iitiPisii�«7:;�.?& r htir,�tid 4i i'Lrt3ua .* .'a 21- 2714 -01 March 25, 1998 b. What kind and amount of vegetation will be removed or altered? The site includes both natural and landscape vegetation including grass, fir trees, and various shrubs and bushes such as rhododendrons, Oregon grape, salal, and ornamentals. Excavation and backfill of the reservoir and inlet and outlet piping would disturb the surrounding trees, vegetation, and park improvements. c. List threatened or endangered species known to be on or near the site. The Washington Department of Natural Resources was contacted for information on threatened or endangered plant species (January 1998). It was determined that there are no listed or endangered plant species or high quality ecosystems known to be on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Vegetation would be restored so that the landscape was similar to the original park condition. The area where the school is demolished would be seeded with grass after grading. An irrigation system would be constructed for the area disturbed by the reservoir construction. Trees removed from slopes that are 20 percent or greater would be replaced per City of Tukwila ordinance 5. Animals a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: birds: hawk, heron, eagle, songbirds, other mammals: deer, bear, elk, beaver, other fish: bass, salmon, trout, herring, shellfish, other: b. List any threatened or endangered species known to be on or near the site. The Washington Department of Fish and Wildlife was contacted for information on threatened and endangered species (February 1998). It was determined that there are no threatened or endangered species on or near the site. c. Is the site part of a migration route? If so, explain. Generally, all of the river basins, lakes, and marsh areas of the Puget Sound region are part of the Pacific Flyway. The Pacific Flyway is used by waterfowl and other birds for shelter and food gathering during the annual migration. The project is not located within any of the areas described above. d. Proposed measures to preserve or enhance wildlife, if any: None proposed. Highline Water District Crestview Reservoir i�A�. iA' ��xa�,•. 5�4'%: �fa3371. t�' 1rofY:''" �` 33�� .�`'vX%_:,o+i:�`+'a'- ww 13 21- 2714 -01 March 25, 1998 "a`it`1''.n'1'.�i l'.M'S`.L +y 4- 14.1ie.s'4loiSfaAVP :*16; ism; 7 'i 4IkY ' ". 6. Energy and Natural Resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. There would be minimal electrical requirements necessary to operate the reservoir signals, metering station, and inlet valves. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. The project would not affect the potential use of solar energy by adjacent .properties. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: No energy conservation features are proposed. 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. There are two underground storage tanks located on the west side of the southern-most school building (a heavy oil tank and a light oil tank). Fill ports for the two tanks are located in the gravel parking area next to this building. It was undetermined whether either of these tanks has any contents. Soil testing next to the tanks indicated that there had likely been no leakage of petroleum materials from the two tanks. These tanks would be removed as part of the elementary school demolition. All of the elementary school buildings contain asbestos. Generally, the asbestos is either thermal system insulation or miscellaneous materials. The thermal system insulation asbestos was found in the hard lagging and mud on pipe runs, pipe fittings, elbows, and hangers. The thermal system insulation asbestos was determined to be friable (when dry, the asbestos can be crumbled, disintegrated, or reduced to powder by hand pressure or by the forces exerted against the material during demolition or disposal). Friable asbestos is a health hazard. The miscellaneous asbestos materials are found in the kick panels on exterior doors, flexible duct connectors on the heat exchangers in the mechanical rooms, floor tiles, undercoating on steel sinks, window putty, vinyl sheet flooring and/or mastic, the panels and atop the covered walkways and the sunshade panels. The miscellaneous asbestos material was found to be non - friable. 1) Describe special emergency services that might be required. It is not anticipated that any special emergency services would be needed. IYighline Water District Crestview Reservoir :�Gf•1.'��.I:v�`{:.4�d! ^: �':w:Y A!'!" .a`n�ir iiit .utrzto, 14 ... +liKOti✓- 21- 2714 -01 March 25, 1998 z �W rt JU 00 O; NW w= N u O. g u_ a, a: I- al z 1._. �O z E--: w uj U� 0 N. I— W' LL' O. ui z U(0 O 1— z 2) Proposed measures to reduce or control environmental health hazards, if any: Removal of the underground storage tanks would be performed in accordance with local and state regulations. z Removal of the asbestos material in the school would be performed in accordance with the Puget 1— w: Sound Air Pollution Control Agency regulations and by a person trained in accordance with the 6 = Washington Department of Labor and Industry Standards. v O t No b. Noise w =. J t- 1) What types of noise exist in the area which may affect your project (for example: w o traffic equipment, operation, other)? 2 u-a There would be noise associated with heavy equipment and construction activities during the N n school demolition and while the reservoir is being built. There would be no noticeable = w operational noises once the project is completed. z F 2) What types and levels of noise would be created by or associated with the project on a w w short-term or a long -term basis (for example: traffic, construction, operation, other)? D o Indicate what hours noise would come from the site. o �. Construction would generate short-term noise. The maximum noise levels generated by = w construction equipment and vehicles ranges from 70 to 110 decibels (dBA) at 25 feet. While o; noise from construction only occurs during construction, it does raise the ambient noise levels — z. and is often accompanied by shorter intense bursts of noise. Increased daytime construction noise v N typically results in annoyance to sensitive receptors such as hospitals and schools. However, p F there are no sensitive receptors in the vicinity of the project. Residences may also be disturbed z by construction noise, but this annoyance typically occurs in early morning or evening hours. 3) Proposed measures to reduce or control noise impacts, if any: Mitigation for construction noise should include the following measures: • Construction operations should be scheduled or timed to keep average sound levels low. Those activities producing the highest noise levels should be scheduled to coincide with the highest ambient noise levels such as peak traffic periods. Similarly, activities should be curtailed during periods when noise impacts on residential areas would be most severe, such as during evening hours. • Construction hours should be limited to specific times. • Equipment should not be left idling when not in use. • Mufflers and sound attenuation devices should be installed and maintained on all equipment. • Small portable acoustic screens should be placed around particularly noisy equipment. Highline Water District 15 21- 2714 -01 Crestview Reservoir March 25, 1998 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? The site is mainly used for recreation. Facilities on the site include a park (the City of Tukwila has a 40 -year lease for the park area) and the Crestview Elementary School. The park consists of open and wooded areas and includes a parking area, picnic shelter, playground equipment, basketball court, asphalt play area, and a baseball field. The baseball field is used extensively by the Little League starting in April and running through the summer. The Crestview Elementary School is in a deteriorating condition and is no longer used for teaching. The school is used by the Highline School District to store desks, chairs, tables, and lamps. The majority of the properties adjacent to the project site are single - family residences. The exceptions are a dental office located west of the site and a daycare center located to the south. b. Has the site been used for agriculture? If so, describe. The site has not been used for agriculture in the recent past. The area was farmed in the 1930's and 40's, but by the 1950's, the project site was unused and property in the vicinity had been converted into single - family residences. c. Describe any structures on the site. The site where the reservoir would be located has a picnic shelter. The Crestview Elementary School buildings are adjacent to the reservoir site. The school consists of three buildings including a gym/cafeteria and office building, and north and south buildings. d. Will any structures be demolished? If so, what? The existing elementary school would be demolished. Some of the park structures such as the picnic shelter would be taken down and replaced following construction. e. What is the current zoning classification of the site? The reservoir site is zoned low density residential. f. What is the current comprehensive plan designation of the site? The current comprehensive plan designation for the reservoir site is low density residential. There is also a public recreation overlay designation for the site. g. If applicable, what is the current shoreline master program designation of the site? Not applicable. Highline Water District Crestview Reservoir 16 21- 2714 -01 March 25, 1998 h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. There are no environmentally sensitive areas on the reservoir site. Gilliam Creek is considered an environmentally sensitive area. z 1I' i. Approximately how many people would reside or work in the completed project? ixQ w J V': No people would reside at the completed project. There would also be no full-time people U o; employed at the project. However, water district staff would periodically visit the site to monitor ; co W equipment and perform routine maintenance. cil i. j . Approximately how many people would the completed project displace? w O '2 J: No people would be displaced. co =w k. Proposed measures to avoid or reduce displacement impacts, if any: z is t- O: z t-. Not applicable. W w' 1. Proposed measures to ensure the proposal is compatible with existing and projected land o -; . uses and plans, if any: w w' U. The project would replace existing park structures and vegetation removed during construction. u. P. ui z 0 �, a. Approximately how many units would be provided, if any? Indicate whether high, z middle, or low - income housing. 9. Housing Not applicable. b.. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low - income housing. Not applicable. c. Proposed measures to reduce or control housing impacts, if any: Not applicable. Highline Water District Crestview Reservoir 17 21- 2714 -01 March 25, 1998 f'ta� ?:;:.5i��"'i';'�'•i? a'< fa: 33. 2iT1.?,^- .�i?`.fi`�b ^.'3�:n�,F�u a.. Verf0 Y7?114t1d:.'" :fti•,. y,. .'•915: • 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The tallest structure would be either the vent or accessway depending on the final design. If the vent was incorporated into one of the park structures or a separate building, it would be approximately 10 feet tall. Otherwise, it would be 3-5 feet in height. The proposed reservoir would be buried underground and constructed of concrete. b. What views in the immediate vicinity would be altered or obstructed? No views would be obstructed. The view of the site would be improved by removing the existing elementary school. The elementary school is boarded up and is in a deteriorating condition. c. Proposed measures to reduce or control aesthetic impacts, if any: The reservoir would be buried underground. 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur ?' The project would not produce light or glare. b. Could light or glare from the finished project be a safety hazard or interfere with views? Not applicable. What existing off -site sources of light or glare may affect your proposal? No off -site sources of light or glare would affect the proposal. d. Proposed measures to reduce or control light and glare impacts, if any: Not applicable. 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? The site itself provides recreational opportunities. The area where the reservoir would be sited is a park. The project property also includes trails, a baseball field, and basketball court. Highline Water District Crestview Reservoir u .. la i rn• 4 {.0n4 4:r'', 4C+ �! °ltfi�!a�K�`rti= �i:krgia ?G`�i 18 iiFiF�ix(ti4f 9 fiatiA,Trt ?,8laV.M4'3xI,4 • m�; 21- 2714 -01 March 25, 1998 xrzi b. Would the proposed project displace any existing recreational uses? If so, describe. The project would displace park users during the construction period. c. Proposed measures to reduce or control impacts, if any: The contractor will need to install temporary fencing around the construction area to separate construction operations from citizens using the park and the baseball field. It is anticipated that the Highline Water District would need to work with the Highline School District and City of Tukwila Parks to provide temporary parking during construction. The temporary parking would be ideally located on the existing school parking lot that is currently not available to the public. Additional pedestrian facilities may also have to be constructed to allow access to the baseball field and park facilities. 13. Historic and Cultural Preservation a. Are there any places or objects listed on, or proposed for, national, state, or local preservation registers known to be on or next to the site? If so, generally describe. There are no places or objects listed on, or proposed for, national, state, or local historic registers known to be on or next to the site. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. There are no landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or near the site. c. Proposed measures to reduce or control impacts, if any: Not applicable. 14. Transportation a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. The site is accessed via 42nd Avenue S and S 162nd Street. b. Is site currently served by public transit? If not, what is the approximate distance to' the nearest transit stop? Metro route 170 runs from S 188th Street along Military Road S to S 160th Street and then to Pacific Highway S. This route connects McMicken Heights with downtown Seattle. The nearest transit stop is located near the corner of Military Road S and S 164th Street. Highline Water District Crestview Reservoir 19 -;.>0.64i=46:.`" r"K*c�!: ''4rY afi�•s�L'ir'a"ciiII%is�. v`''u'1micF�iY'uw' i S `A�aY;i"�� "!ir'r kt 21- 2714 -01 March 25, 1998 .. •aG•i:'i�Ys">a' °•.:- "lk5::Gap z H Z. JU o 00' W =• . 1 w g J; LL =; to a �w z� �o z �- III a U� w W, 0: . z. c. How many parking spaces would the completed project have? How many would the project eliminate? The project would not have any completed parking spaces. The project may result in an increase in parking at the park by utilizing existing elementary school parking spaces that were off-limits to vehicles in the past. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). There may be a need to reconstruct part of the access road to the park. e. Will the project use (or occur in immediate vicinity of) water, rail, or air transporta- tion? If so, generally describe. The project does not occur in the immediate vicinity of water, rail, or air transportation. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. During construction, the project would generate approximately 2,100 (22 yd3 round trips) truck trips to haul away the excess excavation material. Approximately 100 (22 yd3 round trips) truck trips would be needed to haul away construction debris. There would also be numerous truck trips for the construction of the reservoir. The number of trips would be contingent on the final type of construction. It is estimated that there would be approximately 400 truck trips for precast and probably double that amount if it were cast -in- place. These truck trips would exclude daily service truck traffic. Periodic maintenance would be the only vehicular trips associated with the completed project. g. Proposed measures to reduce or control transportation impacts, if any: Construction of the piping will require closure of one lane of traffic during construction. A traffic control plan would need to be developed to assist local vehicular flow. During construction, it may be necessary to restrict traffic to one way. One way traffic on S 160th Street would allow the contractor to expedite construction and resume normal traffic as soon as possible. 15. Public Services a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. The project would likely reduce the need for public services such as police, because demolition of the school would remove an attractive nuisance. Highline Water District Crestview Reservoir 20 21- 2714 -01 March 25, 1998 9Ft`;r3i'D "iA': ' N iiC 1i8t t5 . ....... , 'i 9e .X id tai t IS Seim xw> Yi ; . 4x ri F'Y ar GaY MPs_ t k ; �si#lY ddttiCx: l t b. Proposed measures to reduce or control direct impacts on public services, if any. No measures are proposed. 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. Utilities needed would include power and possibly a dedicated phone line for the telemetry system. C. ' SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature:. Date Submitted: Highline Water District Crestview Reservoir 21 21- 2714 -01 March 25, 1998 ,r .,,.vri%rr.:`..1.x:v.w .t..,.: inva•s;3,,i,Lt... sG4 yt�s X5031: tti: i! iS, 4- ��r< w) �� +p /;'.7i::G!6il`!%'+!:r�4•9 Y: C:' ' =:a�f itk t?�;7" a 't ei ,�, f i'4" 'r 9' �.m 6� a�'i� �'dt.;�.' , i;�'i w..t,ry,,..�,yn�A's+'ht Z. UO Wo rn W w =: W O: lL; Q:, D; = a.. I— W, Z �.;. Z f-; - moo; W W IL 111 Z: OH DETERMINATION OF NON - SIGNIFICANCE Description of Proposal: The purpose of the project is to construct a water storage reservoir at the Crestview Elementary School site to increase the water storage capacity in the Highline Water District and serve future peak demand requirements. The project may also provide additional capacity to help serve the demand in neighboring water districts. The project consists of several components including demolition of the Crestview Elementary School, construction of a 7.6 to 8.1 million gallon reservoir, installation of a new metering station and hookup to the Cedar River Pipeline #4, and construction of potable water pipelines and drain/overflow lines. Proponent: Highline Water District Location of proposal: The reservoir site is located east of 42nd Avenue S. between S. 160th and S. 164th Streets at 16200 42nd Avenue South in the City of Tukwila. The site is located in Section 27, Township 23 North, Range 5 East of the Willamette Meridian. Lead Agency: Highline Water District The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21 C. 030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. There is no comment period for this DNS. This DNS is issued under 197 -11- 340(2); the lead agency will not act on this proposal for 15 days from the date below. Comments must be submitted by 4 /30/98 . Responsible Official: Peggy Bosley Position/Title: General Manager Address: Highline Water District 23828 30th Avenue S. Kent, WA 98032 Date: 3/b�9r1 Signature: Phone: (206) 824 -0375 ::u', v ^ .. {. t •! a i ivik '� k l�7rCi;¢ ..$, Atiais. x=:�'5 ,<1'./i'sM14(a t,w 1Aba1i,.tz%a� aii l.t:f ty'' 3"! ",a att am` i 4P.A [ t ti t�. . _ �d .N�-� �d: �LSt�tr+�a �,9.�.X6�'c':'+�os.�Sc&�Its 34:« S# x. �: :�ii��8iiftls'zJ(4aFia�•s'e..= ATTACHMENT C �:)..)- �',A',,n .;: 1. �r. r..,.' 2L+ .rs.: %:c'er...:.i4;�u.zni.,:�:s Ls,•A�.:.�t Kg.i` _1:i�7:!''L'.rJ,i; ..'_i'�.. ra s!Y.M,Jl,irY�•nC'; City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director April 30, 1998 Peggy Bosley, General Manager Highline Water District 23828 - 30 Ave S. Kent, WA 98032 Re: SEPA Checklist comments concerning Crestview Park Reservoir Revision Dear Ms. Bosley: Thank you for providing Tukwila with the opportunity of reviewing the SEPA checklist on the referenced action. Most of the comments pertaining to this action involve direct impact to Tukwila's Parks and Recreation Department. Don Williams, the Director of the Parks and Recreation Department, has provided comments to Highline and Parametrix staff. The following is a summary of the potential recreation impacts (Item 12) raised in his April 3, 1998 letter: 1. Tukwila has exclusive use of the proposed tank site for park purposes. There is no current legal right for the water district to build in the park area. 2. If construction occurs, a plan needs to be developed that anticipates continued use of the non - affected park areas during the construction period. 3. No plan for relocating and/or reusing the shelter is mentioned in the checklist, which will occur as a result of the new reservoir. 4. Any new parking must comply with City of Tukwila parking requirements, including the development of parking stalls that meet the Washington State Barrier Free code. 5. The site of the proposed reservoir should be re- established as park with similar conditions. 6. Disruption of the play equipment adjacent to the construction site should be avoided. 7. The portable restroom facility must be maintained during the construction period. 8. The present school site, after demolition, could be used for additional park area. In addition to the preceding comments, an approved permit from PSAPCA is required to apply for a City of Tukwila Demolition Permit. Again, thank you for the opportunity to comment on this project. Sincerely, Michael Jenkins Assistant Planner cc: Reviewing city departments 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 -3670 • Fax (206) 431 -3665 ti�.f;"rkk7G Qiitl{3G' iSk.Y'�'r�i�i2'tfie It`Ss' e.. %' . ' `u87,ad. Ja.i,AJ4 V44 ti+�4em ''I`Sroo LrAUWW s41 * z w 6 • J U• U O` t • Nom. CO 11.1. •J • N u- uj C7 = F- _. •zH la tu; Ill il]. -V_ • • z, U =:,. • z CITY OF TUKWILA UNCLASSIFIED USE PERMIT CRITERIA 1. The proposed use will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity. The construction of the reservoir would not be injurious to the property or its use by the public because the reservoir would be buried and all areas disturbed by construction would be restored to preconstruction conditions. This would allow for the in kind use of the existing park on the completion of the reservoir project. There are also safeguards built into the design of the reservoir to ensure the safety of residents and properties located downhill from the reservoir. These safeguards include backup inlet control valves, reservoir storage capacity to provide in excess of two hours for water district response time to correct any problem should both the primary and backup inlet control valves fail, a control scheme to call for maximum water transfer to other reservoirs in the Highline Water District system should the level continue to rise, and an overflow line to transfer overflow water to the City of Tukwila storm sewer system. In addition, the reservoir construction will utilize proven state -of -the -art methods and materials of construction to minimize leakage and ensure structural integrity with Zone 3 Seismic Design Criteria and an Importance Factor of 1.25. Part of the proposal is to remove the existing Crestview Elementary School. The school is in a deteriorating condition and is subject to vandalism. The demolition of the school would remove an attractive nuisance. The school building is known to have PCB - containing material, lead based paints and asbestos - containing materials. The site also has underground storage tanks. All of these problem materials would be removed as part of the demolition project and disposed of in a regulated and approved manner. The school site will be landscaped with grass, shrubs and trees in a manner acceptable to the City of Tukwila, in accordance with the City's Tree Ordinance, and be available for use as park (the Highline School District may decide to rebuild the school at some point in the future). These measures would be beneficial to public welfare. 2. The proposed use shall meet or exceed the same standards for parking, landscaping, yards and other development regulations that are required in the district it will occupy. The project is able to meet or exceed those development standards of the residential district that apply to the proposal. Except for the removal of the school, the completed reservoir project would only result in some very minor changes to the existing site. Development standards for setbacks, parking, landscaping, etc. would be met by the project. For example, the reservoir and school site will be landscaped following construction and demolition. A landscaping plan will be prepared for review and approval by the City. Parking for the site will be increased beyond the requirements of the project by the redevelopment and upgrade to ADA Standards of the existing school parking lot which has been closed in the past, and retaining or eliminating Highline Water District Crestview Reservoir 1 Unclassified Use Permit Application the existing ADA area at the discretion of the City of Tukwila. 3. The proposed development shall be compatible generally with the surrounding land uses. The surrounding land uses are generally single - family residences. Land uses on the site include active and passive forms of recreation. The reservoir would be buried underground and covered with grass. This would enable the unobstructed use of the park and virtually eliminate any visual impacts. Additionally, the school demolition would create additional grassed areas for park use, subject to agreement between the Highline School District and the City of Tukwila, as the current leased park land does not include the area presently occupied by the Crestview School building. The completed project would have no adverse impacts on noise, traffic, aesthetics, or existing on -site uses. Therefore, the project is not likely to be incompatible with the surrounding land uses. The project proponents have held public meetings and met with Local neighbors in an effort to ensure that the project is compatible with the surrounding neighborhood. The Highline Water District has also met with City of Tukwila staff to discuss design aspects of the project so that it conforms with City regulations, wants or needs. For example, discussions with the Park Department have resulted in modifications to the design such as restoration of an existing park structure which would have to be temporarily removed as part of the project, the addition of an irrigation system to help establish the new landscaping or replacement of landscaping disturbed as a result of the construction and measures for ensuring that there is unobstructed access and parking for the ballfield during reservoir construction and school demolition. 4. The proposed use shall be in keeping with the goals and policies of the Comprehensive Land Use Policy Plan. The following Comprehensive Plan policies pertain to the project. The project's compatibility with these policies is briefly described under each of the policy categories. Policy 1.4.1 - Require that new development along hillsides and bluffs retain substantial amounts of significant trees. The project generally avoids most of the trees on the site except for some trees located on the northwest corner of the project site. Any significant trees removed as part of the project would be replaced per the Tukwila Tree Ordinance (Chapter 18.54). . Policy 1.10.7 - Work with public agencies to incorporate public spaces as an important element of major public transportation, utilities and facilities projects. The project would be constructed within a public space. However, by burying the reservoir, the public space would not be lost or degraded. Removal of the existing school would create additional public open space. Policy 3.3.3 - Ensure that residential neighborhood inf ll and redevelopment is not hampered Highline Water District Crestview Reservoir 2 Unclassified Use Permit Application • because of inadequate water, sewer, storm water management, and streets. The purpose of the reservoir project is to ensure that there is adequate water supply to meet existing and future projected demand for water in the District's service area (which includes part of Tukwila). The Highline Water District is also considering expanding the reservoir so that there would be excess capacity to help serve the needs of neighboring water districts which includes other districts serving Tukwila. Policy 4.1.1 - Regulate land use and development to protect natural topography, geology, vegetation, and hydrology and prevent significant erosion, sedimentation or degradation of hillsides, wetlands, watercourses, and their associated buffers. The completed project would have little or no affect on topography, geology, vegetation or hydrology. The topography of the site would be slightly altered. Vegetation removed during construction would be replaced. There would be no impact on the geology or hydrology of the site. During construction, mitigation measures will be used to prevent erosion or sedimentation impacts (see question 5 below). Policy 4.1.2 - For new development, control peak runoff rates to predevelopment levels and minimize the effects of the small, frequent storm events. Maintain water quality to predevelopment levels, and prohibit direct discharge to downstream drainage systems unless allowed by specific regulations. The project would not affect storm water runoff rates due to the overall reduction in impervious surface (largely from removing the elementary school) and that the on -site soils have a natural ability to rapidly drain storm water. There would be minimal impervious surface created by the reservoir because the reservoir and most of the appurtenances would be buried. There would be no regular direct discharges of storm water to any downstream drainage systems. Policy 7.2.1 - Prevent community and environmental degradation by limiting noise levels. Policy 7.2.2 - Discourage noise levels which are incompatible with current or planned land uses, and discourage the introduction of new land uss into areas where existing noise levels are incompatible with such land uses. Policy 7.2.3 - Require building contractors to limit their construction activities to those hours of the day when nearby residents will not be unreasonably disturbed. The project would not generate any noise during operation and would therefore be compatible with the adjacent residential land uses and the on -site park uses. The project would result in noise during construction which would be mitigated by: (1) limiting construction to certain hours as specified by the City of Tukwila, (2) using mufflers on construction vehicles and equipment, (3) not idling equipment when not in use, (4) timing construction activities to keep average sound levels low, and (5) using small portable Highline Water District Crestview Reservoir 3 Unclassified Use Permit Application acoustic screens around particularly noisy equipment. rolicy 12.1.36 - Encourage utilities to consolidate facilities and minimize visual impacts of facilities where technically feasible. Policy 12.1.38 - Utility services within the City shall be undergrounded based upon the Tukwila Comprehensive Plan and development regulations. The reservoir would be located underground as would all appurtenances except for the vent and reservoir accessway. These appurtenances may be incorporated into a park structure to further minimize visual impacts. All measures shall be taken to minimize the possible adverse impacts which the proposed use may have on the area in which it is located. Generally, the impacts of the project will occur during construction and the project incorporates mitigation measures for construction impacts. The following mitigation measures to minimize adverse impacts are proposed for the project: • A temporary erosion and sediment control plan (TESCP) would be developed for use during construction. The TESCP would utilize recognized construction best management practices (BMPs). BMPs may include some or all of the following: preservation of the existing vegetation where possible, temporary seeding, mulching, graveling, fabric fencing, dikes, swales, subsurface drains, gradient terraces, etc. The actual measures would be included in the TESCP in accordance with permit requirements. • Excessive dust would be reduced by spraying water over disturbed soil areas. • Mitigation for construction noise would include the following measures: 1) Construction operations would be scheduled or timed to keep average sound levels low. Those activities producing the highest noise levels should be scheduled to coincide with the highest ambient noise levels such as peak traffic periods. Similarly, activities should be curtailed during periods when noise impacts on residential areas would be most severe such as during evening hours. 2) Construction hours would be limited to specific times. 3) Equipment would not be left idling when not in use. 4) Mufflers and sound attenuation devices would be installed and maintained on all equipment. 5) Small portable acoustic screens would be placed around particularly noisy equipment. ) Highline Water District Crestview Reservoir 4 ..... r.. r^ ��;' lh'!::°". r;„": 5ai� :�f- ';i4;S�,%' ^ii�ia:f %i:ru?i:' del`' ui .`.r.'fis'�3r.•d�'.C'R".YSSab! ..._..........�....._.,.... Unclassified Use Permit Application • The project would replace existing park structures removed during construction. • The contractor will need to install temporary fencing around the construction area to separate construction operations from citizens using the park and the baseball field. It is anticipated that the Highline Water District would need to work with the Highline School District and City of Tukwila Parks to provide temporary parking during construction. The temporary parking would be ideally located on the existing school parking lot that is .currently not available to the public. Additional pedestrian facilities may also have to be constructed to allow access to the baseball field and park facilities. Construction of the piping would require closure of one lane of traffic during construction. A traffic control plan would need to be developed and implemented to assist local vehicular flow. During construction, it may be necessary to restrict traffic to one way. One way traffic on S. 160th Street would allow the contractor to expedite construction and resume normal traffic as soon as possible. Vegetation would be restored so that the landscape is similar to the original park condition. The area where the school is demolished would be seeded with grass after grading. An irrigation system would be constructed for the area disturbed by the reservoir construction. Trees removed from slopes that are 20 percent or greater would be replaced per City of Tukwila ordinance. Removal of the underground storage tanks near the school would be performed in accordance with local and state regulations.., Removal of the asbestos material in the school would be performed in accordance with the Puget Sound Air Pollution Control Agency regulations and by a person trained in accordance with the Washington Department of Labor and Industry Standards. Highline Water District Crestview Reservoir � '. l+Ja*K}xC'YV14fIRalwn 5 Unclassified Use Permit Application z tr-Zi Cw; d- • �. JU: O 0: to 1 .rn w LLI J =. • u. wo u_ <. CO = a; _ z 1- 0. z'—. w uj U �! 0 0 H. ww H U u — O: ui z 0 z Parametrix, Inc. Consultants in Engineering and Environmental Sciences 5808 Lake Washington Blvd. N.E. Suite 200 Kirkland, WA 98033 -7350 425 - 822 -8880 • Fax: 425 - 889 -8808 Michael Jenkins City of Tukwila 6300 Southcenter Blvd. Tukwila, WA 98188 Dear Michael: RECEIVED JUL 2 2 1998 COMMUNITY DEVELOPMENT July 20, 1998 21- 2714 -01 This letter provides information to amend the unclassified use permit application #L98 -0034 for the Highline Water District's Crestview Reservoir project. City ordinance #1816 passed by the Tukwila City Council adds three criteria to the list of criteria for granting an unclassified use permit. The following information describes how the project relates to those three criteria. 1. All facilities shall be undergrounded when possible. The proposed reservoir will be buried underground and all areas disturbed by construction would be restored to preconstruction conditions. For uses in residential areas demonstrate that there is no reasonable nonresidential alternative site for use. In 1997, the Highline Water District performed a reservoir siting study and considered five sites, three of which were determined to be large enough for a reservoir. While the site locations were not in themselves residential, each of the three sites was adjacent to residential uses. One of the problems in siting a reservoir within the Highline Water District is the fact that the area within the District is mostly residential. However, the Crestview Elementary site is a nonresidential site. The siting of the reservoir is not only constrained by site size, but many other factors such as site elevation, site availability, location of site in relation to water source, environmental considerations, hydraulics and pumping requirements, cost, community acceptance, and permit and zoning requirements. The siting study took these factors into consideration and stated that "no other sites lying within the District's 560 zone have been identified at this time." 3. For uses in residential areas demonstrate that the use provides some tangible benefit for the neighborhood. The proposed project would provide several benefits: (1) removes the existing elementary Parted on Rervcien Pupo Michael Jenkins City of Tukwila July 20, 1998 Page 2 school which is an attractive nuisance and contains hazardous materials (PCB - containing material, lead based paint and asbestos), (2) augments the facilities at the park by improving views, (3) creates additional park area on the school building site (this would be available to the public unless the school district decides to build another school on the site), and (4) provides additional landscaping and an irrigation system to the park area. Please let me know if you need any other information regarding the unclassified use permit for the Crestview Reservoir project. Sincerely, CP . Z` IX W.;. D! J U • U O :N LIP w. w 0' w ¢ = a. Z I- O: Z .11J uj U 0; N; w • 'I 0 wz. U V); t- . 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Sr. Frank Hansen Kathy Gehring Joe Brennan Don DeHan 17900 International Blvd., Suite 401 • SeaTac, Washington 98188 -4236 City Hall: (206) 241 -9100 • Fax: (206) 241 -3999 • TDD: (206) 241 -0091 City Manager Calvin P. Hoggard Assistant City Manager Jay Holman City Attorney Robert L. McAdams City Clerk Judith L. Cary July 24, 1998 City of Tukwila Department of Community Development Michael Jenkins, City Planner 6300 Southcenter Blvd:, #.100 Tukwila, WA 98188 Re: Unclassified Use Permit — Crestview Reservoir Dear Mr. Jenkins, R .E CE VF. D JUL 2r199E COMMUNITY Ot MEN T Thank you for the information regarding the proposed reservoir project and the pending Unclassified Use Permit. The City staff reviewed the information and are concerned that the truck traffic be limited to Interstate Five /State Route 518 (SR -518), South 160th to access Military Road South and ultimately the project site. Due to the high volume of truck trips that will be generated by this project, the City would like to ensure that there are no materially detrimental impacts to Military Road South and SeaTac surrounding neighborhoods. We ask that there be a condition of the Unclassified Use Permit that requires the Water District or contractor obtain a Haul Permit from the City of SeaTac prior to any construction activities. If you have any questions regarding our concerns and request, please contact Dale Schroeder or me at (206) 439 -4701. SilncerVy, ll i44L_ 'Michael Booth Senior Planner Cc: Bruce Rayburn, Public Works Director Don Monaghan, Asst. Public Works Director Dale Schroeder, Engineering Supervisor Steve Butler, Planning Director TO: FROM: DATE: RE: City of Tukwila 6200 Southcenter Boulevard • Tukwila, Washington 98188 John W. Rants, Mayor MEMORANDUM Z re w, 0 0 O U) cnw w =; 1-, N w. w o' CD i v. 2' 1= o zI ww The neighbors who attended (see attached list) indicated that their largest o, 0 -: '0 H_ • How different will park look "'' =V • Where will tank be located u. • Why was playground equipment being saved at expense of their security w z; .. • What could be installed to ensure that no visual or physical access from the _, park can occur o File Michael Jenkins September 21, 1998 Meeting with residents adjacent to Crestview Park On September 10 I held a meeting with property owners on the west side of Crestview Park to present options that address the loss of the evergreen trees along their property line. The meeting was also attended by Richard Ward, a Landscape Architect, Tom DeLaat and Mike 011ivant of Parametrix and Keith Harris of Highline Water District. concerns were: Mike 011ivant discussed a number of options with the neighbors, including: • A security fence made of cedar • Shrub plantings along park side of fence • Retention of some evergreen trees • Possible plantings of new evergreen trees Mike also explained that moving the reservoir to the east would result in higher costs from deeper trenching for the reservoir and pipes, decreased efficiency due to the increase in distance from the Cedar River Pipeline and overall higher costs. Given the cost and technical problems that would result from the move, the neighbors in attendance understood why it could not be moved. Phone: (206) 433 -1800 • City Hall Fax: (206) 433 -1833 7hirta i i8lwiA;n iar av at "'p t0.2+ 1:"+.4e44M..Nswj,Lk '4.<11ii44,4-0ir. 1A;`:, September 10, 1998 meeting Crestview Reservoir Landscape Revisions NAME Proki dolepEk_ ADDRESS (-4.1 Auk s, S � :I�� 1 arc* L102,-,d /7/`P. S . /ooza ��,77reL61.&-e S . k 'rtY:St,i4tik -:x i; kv:20,,kv�te4),4 ;Nii`4,g, • z FZ oc 2;. .6 .V O' • ln W • J. • LL. • ? id;. • Z H, F- o .Z WW. :2a:. WW !,1,7— O Z• Z A F F I D A V I T O F D I S T R I B U T I O N ,,,J , 7p- -! lui hereby declare that: Notice of Public Hearing O Determination of Non - significance O Notice of Public Meeting 0 Mitigated Determination of Nonsignificance O Board of Adjustment Agenda O Determination of Significance Packet and Scoping Notice O Board of Appeals Agenda O Notice of Action Packet O Planning Commission Agenda O Official Notice Packet O Short Subdivision Agenda O Other Packet ONotice of Application for O Other, Shoreline Management Permit OShoreline Management Permit was mailed to each of the following addresses on Name of Project CNI/C-6 Age File Number oL 00,3 9-02/-9) �..;., Signature ?... .+z ?" ; .4 is g x E t:: a.£ -C.V. x ,0 �r: yr 4):t •'�':�;Sz7l i4 r« ^rc.'�.'r,; },.;' ...hY;�y...4r0 .L .�. ; � !.ax a 3 >rvC',e ir�5�:: �: xi*. 1" i?.:' L. tr 'tni+Grayd;.t�4f'L,s.�a:ra 1' ';L'�7+e.Fnla'�'t:f`.'iiG,:dtii& iAkhi £ .»�i'1P1� "a}f;.�r,�a�� "M' *,.rRytis�isss�:+ iL ' `:�. City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster Director SEPTEMBER 21, 1998 CITY OF TUKWILA NOTICE OF HEARING PROJECT INFORMATION Highline Water District has filed an application for an Unclassified Use Permit, Number L98 -0034, to construct a 8.1 Million Gallon Underground Water Reservoir at Crestview Park, 16200 - 42nd Ave S. You are invited to comment on the project at the public hearing scheduled for October 5, 1998 at 7:00 p.m. before the City Council. The hearing will take place at City Hall in City Council Chambers, 6200 Southcenter Blvd. To confirm the time and date before the hearing, call the Department of Community Development at 431 -3670. For further information on this proposal, contact Michael Jenkins at 431- 3685 or visit the offices of the Department of Community Development at 6300 Southcenter Boulevard, Suite #100, Monday through Friday, 8:30 a.m. to 5:00 p.m. Permits applied for include: Unclassified Use Permit Other known required permits include: • Demolition Permit • Land Altering Permit • Development Permit FILES AVAILABLE FOR PUBLIC REVIEW The project files are available at the City of Tukwila. To view the files, you may request them at the permit counter of the Department.of Community Development (DCD), located at 6300 Southcenter Boulevard #100. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 -3670 • Fax (206) 431-3665 t'n= L:'ti''.. �s '!.I..,.tfA'x„`..,..,..:5 i�ta.a. u, �$.nSiSiti te'J:e%s�+"fi•iy=.• 4,041 :i7"44 �ii� ' •: `: a "" 'S *Ate z Z' g: iD J U: 00 'W= wwo LL Q. w c = w' Z I- LL! M o' 0 wW H U. w � - o: wz z City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director TO: Don Williams FROM: Michael Jenkin DATE: September 11, 1 RE: Meeting with residents adjacent to Crestview Park concerning Toss of evergreen trees MEMORANDUM On September 10 a meeting was held with residents along the west side of Crestview Park to present options to address their concerns due to the loss of the Evergreen Trees on the north and west portions of the park. During the July 22, 1998 public meeting, one of the residents along the west side of the park came to the Public Meeting to express his concerns about the loss of the trees. This concern was documented and signed by other neighbors in two letters to staff on August 3 and August 10, 1998. As a result of this public comment, I contacted Parametrix, the consulting firm acting for Highline Water District on the Crestview Reservoir Unclassified Use Permit. In their letters, the residents expressed concern that the loss of the trees would make their properties visually and physically accessible to park users, which caused them concern about safety on their property. Accordingly, I contacted the consultants and instructed them to prepare alternatives to address these concerns. At the September 10 meeting, Parametrix staff and Highline Water District representatives listened to the residents concerns and agreed to develop a landscape plan that provided permanent fencing to provide security and screen views. They also indicated that a revised landscape plan would be developed to provide additional screening that includes ground cover, shrub and some evergreen trees. As a result of this meeting, the residents in attendance were satisfied with the proposal for additional screening. I advised Parametrix to submit a revised landscape plan that would be ready by September 23 to include in the Unclassified Use Permit hearing packet that will go the City Council. When these plans are submitted I will provide you with a copy for your review prior to the hearing. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 a'?stu�i$iL SAW File: DD mm Drawing# ......��,:v.n,+.i.�.iis: iaca( �. i': a. is ,:::t•,U�,.iLtStk�;�i�SV,.,a.i �.�1Cf' nK.,�k,. ,. i.Ar:..,s(::S;�f'�di'11r`.?i}:. µv!i:a.k2:f: ikr;^.i. , . A, ..;£.,u�u��'f�r_f„r:d:%' -iCa`. 'a':d,J;t f. Sr.:l,?4� U,.; r � •J •:.U0 J= • F- • • W o' LL of F. u,: • ��. z . • w W,: • • • 11111k. • LL • B: z;. • UN�. H = Z.:., City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director August 27, 1998 Jim and Stephanie Onorati 16042 - 42nd Ave S. Tukwila, WA 98188 Re: Crestview Reservoir project (L98 -0034) Dear Mr. and Mrs. Onorati: Attached is a letter from Gary Maynard of Parametrix, the consulting firm representing Highline Water District for the installation of the underground reservoir at Crestview Park. As you will recall, I forwarded the letter you and your neighbors submitted concerning the loss of security due to the removal of the trees along the Northwest portion of the park. Apparently, some options have been developed by these applicants to address your concerns. I have scheduled a meeting for September 10, 1998 at 5:30 p.m. for the applicants to present their plan to provide additional screening. The meeting will be held in Conference Room 3 at City Hall, 6200 Southcenter Blvd. The conference room can be accessed at the east end of the building and will be marked for your assistance. If you have any questions prior to the meeting, please contact me at (206) 431- 3685. I will also forward this letter onto the other residents who signed your August 10 letter. I would appreciate your also informing them of this meeting. Sincerely, Michael Jenkins Assistant Planner cc: Steve Lancaster, Director of Community Development John McFarland, City Administrator 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 14,;44,4,4,;:mxgk;t.af x:TSk`Y:- :1•,}•53?>.' ".if 85r:a:?.9:2h?L:S`a Yi!±� 3fla'iSiaJti:Su!xw�; $�'^ ?!` � �ny�b. ?et iii..<44;Ribity i+A`'1tia':4'i, 0. I .^..�...w.�^t EU V .D er. ve Yv lY f� °^ 'H Parametrix, Inc. 5808 Lake Washington Blvd. N.E. Suite 200 Kirkland, WA 98033 -7350 425 - 822 -8880 • Fax: 425- 889 -8808 AUG 2 4 1998 Consultants in Engjp eoprig pig! gavJ(nmental Sciences Michael Jenkins August 21, 1998 Department of Community Development 21- 2714 -01 City of Tukwila 6300 Southcenter Blvd. Tukwila, WA 98188 RE: Highline Water District Crestview Reservoir Dear Michael: This letter is in response to the citizen letter from Jim and Stephanie Onorati and others that was received on August 10, 1998 by the Department of Community Development. In that letter it was stated that these citizens were in favor of the project, but would like to request that trees in the northwest corner of the project site not be removed. They expressed concerns over safety and privacy and asked that the reservoir be moved farther east so that the trees could be left standing. Moving the reservoir farther east is one option. However, the Park Department has asked that the reservoir not be located east of the proposed location because it would interfere with play equipment in that area, as well as removal of another stand of trees. Therefore, a location farther to the east would have to be approved by the Park Department. Another option would be to leave some of the trees along the northwest corner while keeping the reservoir in the proposed location; it would be possible to leave a 20 -foot buffer of trees. In addition, tall evergreens (over 8 feet) such as Arbor Vitae could be planted close together next to the neighbor's fences to help screen these properties from the park. We believe that leaving the 20 -foot buffer of trees and planting tall evergreens can provide the screening and security that these citizens have requested and still enable the reservoir to be constructed in the proposed location. If you have any questions regarding this response, please contact me. Sincerely, Gary M nard, AIC cc: Tom DeLaat, Mike 011ivant, Keith Harris Printed on Recycled Paper .(.: ?, ?:l;'i-..:.`:I'%i1�iitifi;✓,Zi "T,FkYa'u`tl`n` -,? :';MW;7+ir' 'l fF%t'i'tY,Tniik'��' f�?�i'L4'? +I'. 01,.+a C '.'•%.�.�t AY0Q1V4sii l• ti % 4 i Z ' Z' re W. 0 0' N0 w • tU =, J H N LL W 0. 4: ZF—; I— 0; Z! O N HV` �. wZ; U =; z 1 City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director August 14, 1998 Jim and Stephanie Onorati 16042 - 42nd Ave S. Tukwila, WA 98188 Re: Crestview Reservoir project (L98 -0034) Dear Mr. and Mrs. Onorati: Thank you for your comments dated August 3 as well as the additional comments submitted on behalf of your neighbors. I have provided copies of your letters to Parametrix, the consulting firm that has brought the application on behalf of Highline Water District. Specifically, I related your concerns that the loss of the trees on the northwest property line during the construction of the reservoir would increase access to your backyards from park users. Gary Maynard of Parametrix informed me that the project team will be looking into alternatives that will address your concerns, including moving the development to the east. Once I have heard from them on available options, I will contact you. I appreciate your involvement in the Open House and your thoughtful comments. Sincerely, Michael Jenkins Assistant Planner cc: Steve Lancaster, Director of Community Development John McFarland, City Administrator 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 -3670 • Fax (206) 431-3665 . " m �Ur�w+ yxSi +lr�stii - `k'h' +`C�aae�t 6 i rai ` di�F3 4 z w! J U U0 Wo mow; X J H. w o. u- - a: • a 1-w z1._ o. z uj U U. 'o u' = w'. U. O' N To Whom It May Concern: RECEIVED AUG 1 0 1998 This letter is regarding the proposed plan to put in an underground resevoir tank on the property d )OM!MLJNF t ,'' Crestview Park. DEVELOPMENT First of all, we would like to state that we do not opp use the plan. We are all for the demolition of the school and we are pleased about the fact that the tank will be underground so the park will not be compromised. But we very strongly disagree with the removal of the trees in the Northwest corner. Taking out these trees exposes our homes to the park users and makes it easy for them to access our backyards. Those of us who have children are concerned that their safety is jeopardized if they can be seen and approached by strangers via the park. It would no longer be good for them to play on their own property!!! Yes, we understand that the trees will be replaced, but it will be a very long time before they will be able to provide the kind of protection that they give us now. We had been told in a previous letter that the tank could be moved east if necessary. We believe that it is absolutely necessary to do this. When Jim Onorati attended the meeting about this project, he was told that "alt the people that live on that side of the park want those trees down!" That is simply not true!!! Below are the signatures of the residents on 42nd Ave that border the park that DO NOT want the trees in the Northwestern corner cut down. Thank you for your time. Respectfully, Jim and Stephenie Onorati. I do not want the trees in the Northwestern corner cut down. Please move the water tank eastward. Nff\GUCI-. she \rTLrV.e MAC iona.\4 1(o o 3 (, Lj Znd {i`v t' . S .. wA °I'12e 20(- z`(I- C:05-7 q)44,4 uLu,LA c,), 1d) d ' '7. • \ •) t1 � 7 (: 1 l� b ?: ` l-L�� pk„.c. S 6 (37 ' a n. IO 61,1 Schad:7L-1/ &aro- �Z .40 • sue' ��%ljG, W,9 ?e1rcr Sini..1I' • z W`. L -J C.) U 0. tn0. N w w =_, w}• o OC ~' J. rn = d. H=. z o z t-- O • 0 Oon ro O I- to u. N w o_ ol—; Z City of Tukwila AUG 5 1998 COMMUNITy 6200 Southcenter Boulevard • Tukwila, Washington 98188 John W Rants, Mayor MEMORANDUM CONFIDENTIAL - ATTORNEY / CLIENT PRIVILEGED COMMUNICATION TO: FROM: DATE: RE: Don Williams, Director of Parks and Recreation Bob Noe, City Attorney August 4, 1998 Issues you have brought to my attention and the water tank issue brought to my attention and DCD's attention.. • ,1 .00000: net;(206).. z 11- F— Z ILI CC 2 — J 00 (1) ° CDW W — J 1— U) U_ w o g 11- w a z 1- 0 ZI- 0 •w w • 0 CO o - ca • w wz • 0 LI 0 c.) 0 I- z A , CC: Jack Pace Michael Jenkins John McFarland � August 3, 1998 To Whom It May Concern: This letter is regarding the proposed plan to put in an underground resevoir tank on the property of Crestview Park. First of all, we would like to state that we do not oppose the plan. We are all for the demolition of the school and we are pleased about the fact that the tank will be underground so the park will not be compromised. But we very strongly disagree with the removal of the trees in the Northwest corner. Taking out these trees exposes our homes to the park users and makes it easy for them to access our backyards. Those of us who have children are concerned that their safety is jeopardized if they can be seen and approached by strangers via the park. It would no longer be good for them to play on their own property!!! Yes, we understand that the trees will be replaced, but it will be a very long time before they will be able to provide the kind of protection that they give us now. We had been told in a previous letter that the tank could be moved east if necessary. We believe that it is absolutely necessary to do this. Thank you for your time. Respectfully, Jim and Stephenie Onorati 16042 42nd Ave S. Tukwila (206) 242 -2354 RFCERIFD AUG 5 1998 1 CITY OF T Uicv, IlA MAY- --- OFFICE i•' •' r .�JS*it »;fiT, avi+'€,rtr',+ <ari #"` �r.1.�.�ri;L�T�3i ...,. . •�,t�k.% .....'F: ._ .; � (: n....c L:t.� [..�ukw4iu.:9.a�s. ..;:'vv:V'::k:�.i"r,•::.'.7> �2.;4i bn +J`LJi. at�.YdrSi ILf'� „1.4 }'{::Y+. L .. h7. a.: . • •JU; .UO:• t. :0) taw; • W.=; Nu_ • .w00} J; u.•<. •1_w.. Z�. Z • W W -, :off' • w W� - U3 z• ! • Z City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director July 28, 1998 Keith Harris, P.E. Highline Water District 23828 - 30th Street Kent, WA 98032 Re: Follow -up from Public Meeting on proposed reservoir at Crestview Park (L98 -0034) Dear Keith: You may recall that at the public meeting, a nearby resident was concerned about the removal of the existing trees at the northwest corner of the park. I wanted to explore what options, if any, were available to retain some of these trees. While the benefits to retaining the trees are obvious, I am concerned that the long -term impacts are not. I would like to determine if only part of the tree stand is are removed, if the remaining trees are more susceptible to damage, disease or pose a greater risk of falling down in inclement weather due to the loss of the majority of the stand. If you could research this in relation to the project, I would appreciate your input. I would like to have some response in the next few weeks, so I can forward this on to the citizen who raised this important issue. Sincerely, Michael Jenkins Assistant Planner cc: Gary Maynard, Parametrix Tom DeLaat, Parametrix 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 4313670 • Fax (206) 431-3665 ; ''- z <w.' orb; 00, Nw w=, CO U w0 Q- =d w. Z �. Z w, U ,O u`. F-; w w`. b w z' I IT.: 1 • 1 • Mayor Ms. Terry Anderson Deputy Mayor Shirley Thompson Councilmembers Steve Stevenson, Sr. Frank Hansen Kathy Gehring Joe Brennan Don DeHan 17900 International Blvd., Suite 401 • SeaTac, Washington 98188 -4236 City Hall: (206) 241 -9100 • Fax: (206) 241 -3999 • TDD: (206) 241 -0091 City Manager Calvin P. Hoggard Assistant City Manager Jay Holman City Attorney Robert L. McAdams City Clerk Judith L. Cary July 24, 1998 City of Tukwila Department of Community Development Michael Jenkins, City Planner 6300 Southcenter.Blvd., #.100 Tukwila, WA 98188 Re: Unclassified Use Permit — Crestview Reservoir Dear Mr. Jenkins, RECEIVED JUL 27 1998 COMMUNITY DEVELOPMENT Thank you for the information regarding the proposed reservoir project and the pending Unclassified Use Permit. The City staff reviewed the information and are concemed that the truck traffic be limited to Interstate Five /State Route 518 (SR -518), South 160th to access Military Road South and ultimately the project site. Due to the high volume of truck trips that will be generated by this project, the City would like to ensure that there are no materially detrimental impacts to Military Road South and SeaTac surrounding neighborhoods. We ask that there be a condition of the Unclassified Use Permit that requires the Water District or contractor obtain a Haul Permit from the City of SeaTac prior to any construction activities. If you have any questions regarding our concerns and request, please contact Dale Schroeder or me at (206) 439 -4701. Sfr ,cer‘Iy, ./ !Michael Booth Senior Planner Cc: Bruce Rayburn, Public Works Director Don Monaghan, Asst. Public Works Director Dale Schroeder, Engineering Supervisor Steve Butler, Planning Director TO: FROM: DATE: RE: MEMORANDUM File Michael Jenkins July 23, 1998 Public Meeting at Foster Commons concerning Highline Water District proposed Reservoir at Crestview Park On July 22 a Public Meeting was held at Foster Commons to review the proposal for the reservoir at Crestview Park. 10 people showed up to ask questions and review materials. Gary Maynard and Tom DeLaat from Parametrix and Keith Harris from Highline Water were there to answer questions. Jim Onorati, a resident who lives adjacent to the park, came to the meeting to express his concerns about the removal of the trees to accommodate the reservoir. I had informed him that the applicants had indicated that all of the trees had to be removed to accommodate the related construction, especially because the root systems would potentially be compromised. He wanted to also know why it could not be moved over to the east. He was told that the trees on the east side would have to be removed if tat option was explored. I directed him to Keith Harris to have him explain the technical reasons for the Toss of the trees. Keith indicated that he would look into keeping some of the trees along the perimeter. Q • _ F-: rt 6 J U; UO' CD W: w.= N LL;: WO g mow. zF'. lz o LLJ n D. 3- W W: F= 0 z ,z Parametrix, Inc. Consultants in Engineering and Environmental Sciences 5808 Lake Washington Blvd. N.E. Suite 200 Kirkland, WA 98033 -7350 425 - 822 -8880 • Fax: 425 - 889 -8808 Michael Jenkins City of Tukwila 6300 Southcenter Blvd. Tukwila, WA 98188 Dear Michael: RECEIVED JUL 22 1998 COMMUNITY DEVELOPMENT July 20, 1998 21- 2714 -01 z _ mow: U Oi t No; • Unw. w= N LL w 0' J. u. This letter provides information to amend the unclassified use permit application #L98 -0034 for u d the Highline Water District's Crestview Reservoir project. City ordinance #1816 passed by the _ _ Tukwila City Council adds three criteria to the list of criteria for granting an unclassified use permit. The following information describes how the project relates to those three criteria. w gyp. o The proposed reservoir will be buried underground and all areas disturbed by construction ;w w' would be restored to preconstruction conditions. Xr- p: 2. For uses in residential areas demonstrate that there is no reasonable nonresidential .1; z, alternative site for use. 1. All facilities shall be undergrounded when possible. In 1997, the Highline Water District performed a reservoir siting study and considered five sites, three of which were determined to be large enough for a reservoir. While the site locations were not in themselves residential, each of the three sites was adjacent to residential uses. One of the problems in siting a reservoir within the Highline Water District is the fact that the area within the District is mostly residential. However, the Crestview Elementary site is a nonresidential site. The siting of the reservoir is not only constrained by site size, but many other factors such as site elevation, site availability, location of site in relation to water source, environmental considerations, hydraulics and pumping requirements, cost, community acceptance, and permit and zoning requirements. The siting study took these factors into consideration and stated that no other sites lying within the District's 560 zone have been identified at this time." 3. For uses in residential areas demonstrate that the use provides some tangible benefit for the neighborhood. The proposed project would provide several benefits: (1) removes the existing elementary Printed on Recycled Paper Michael Jenkins City of Tukwila July 20, 1998 Page 2 school which is an attractive nuisance and contains hazardous materials (PCB - containing material, lead based paint and asbestos), (2) augments the facilities at the park by improving views, (3) creates additional park area on the school building site (this would be available to the public unless the school district decides to build another school on the site), and (4) provides additional landscaping and an irrigation system to the park area. Please let me know if you need any other information regarding the unclassified use permit for the. Crestview Reservoir project. Sincerely, (U) CP City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director MEMORANDUM TO: File FROM: Michael Jenkins DATE: July 15, 1998 RE: Parks and Recreation concerns about Crestview Reservoir I spoke with Don William today as a follow up to his June 24 memo outlining his concerns about the project. Specifically, Don was concerned that there has been no modification to existing legal documents between the City and the School District to allow the Highline Water District to access the `park' portion of the land leased by the City of Tukwila to build the water tank. Don was concerned that since none of the legal requirements concerning maintenance, operation or redevelopment of the park had been finalized, the City Council would be concerned about permitting the watertank. After reviewing the issue with Don, we determined that it might not be prudent to discuss any of the issues about modifications to the existing lease agreements between before the Unclassified Use Permit hearing, as the City Council would potentially ratify changes to the lease and, in their quasi - judicial role', would potentially be biased if they are putting the `cart before the horse'. Don and I agreed that it would potentially bias the proceedings. To ensure his comfort level on the project, he would remind Keith Harris at Highline WD about the need to complete negotiations on the revised lease over the existing park area. Don also indicated he would talk to Bob Noe about authority in the existing lease to proceed with changes without concurrence by the City Council, prior to the hearing. We also agreed that any discussions regarding the area of the park where the school is located would require either a new separate lease or significant modification to the existing lease, both of which would require City Council concurrence. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 4313665 z Wiz` W oo U) 0: u) Js u_. W o: J, LL < �a z�. I-o z� R o: W W z; UN z A F F I D A V I T Argil S-&//;0- 0 Notice of Public Hearing JJ Notice of Public Meeting O Board of Adjustment Agenda Packet Li Board of Appeals Agenda Packet f Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet 0 Notice of Application for Shoreline Management Permit Shoreline Management Permit O F D I S T R I B U T I O N hereby declare that: fl Determination of Non - significance 0 Mitigated Determination of Nonsignificance ❑ Determination of Significance and Scoping Notice 0 Notice of Action 0 Official Notice Other Arm& 0 7 AS0/1 Other was mailed to each of the following addresses on diaka Name of Project File Number L- i& L but , . b y Signatur 9 co ut- «.r:_�s.`cu�; e,_... '•:•.:., as,�.,'z sxiL.i::i:>`r:iw�..�:'•ubb`: a Y:c y.�Rtvn�.;_a x:Sio'w,�.�.. • ..> . :. s:. a >. City of Tukwila John W. Rants, Mayor Department of Community Development NOTICE OF APPLICATION DATED JULY 10, 1998 The following application has been submitted for review and decision. FILE NUMBER: APPLICANT: LOCATION: PROPOSAL: OTHER REQUIRED PERMITS: Steve Lancaster, Director L98 -0034 (Unclassified Use Permit) Highline Water District, by Parametrix 16200 - 42nd Ave S. - Crestview Park Installation of an underground 7.6 million to 8.1 million gallon water tank Development Permit Land Altering Permit Demolition Permit for Crestview School These files are available for review at the Department of Community Development, 6300 Southcenter Blvd., #100, Tukwila, WA. Please call (206) 431 -3670 to ensure that the file(s) will be available. OPPORTUNITY FOR PUBLIC COMMENT You can submit comments on this application. A Public Meeting on the proposal will be held, as required under Tukwila Municipal Code 18.104.080. The Public Meeting will include an explanation of the proposal by representatives of the City and the Applicant. An additional 5 days to provide comment on this application will be provided after the Public Meeting, followed by a hearing before the City Council. The following is a list of the dates and process detailed above: Public Meeting: Close of Notice of Application comment period: Public Hearing: (tentative) July 22, 1998 Foster High School Commons 4242 S. 144th St 5:30 - 7:30 p.m. August 3, 1998 October 5, 1998 Tukwila City Hall - Council Chambers 6200 Southcenter Blvd. 7:00 p.m. If you cannot submit comments at the Public Meeting or in writing, you may appear at the hearing and give your comments to the City Council. If you have questions about this proposal contact Michael Jenkins, the Planner in charge of this file, at (206) 431 -3685. Anyone who submits comments will be a party of record and will be notified of any decision on this project. APPEALS You may request a copy of any decision or obtain information on your appeal rights by contacting the Department at 431 - 3670. A decision by the City Council may be appealed to the Superior Court. The Department will provide you with information on appeals if you are interested. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 File: 003 mm Drawing# .' ti• �.t Y. , t: �:.. s.: i, �.: r.. t,>' �n!?. �5dir:' Y. if' �'% litulix: i. ri:C, �uiiiti�wir 'Eti�lv�:.i�t�.(iL�i.Y.ltit:i :�k;:•n, °G4`f�Y�r. �:•. y. ��tiit5? fizz:3X'�2k.���:nitl:iini!G.':i � $' i�xY r:. fl,Y a�F1: ro • i,se J.V,.Fh. :IA . �,t ...��.'uiii�i' -.:{Fi .r�Y City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director MEMORANDUM TO: City Council, Mayor Rant FROM: Steve Lancaster DATE: July 8, 1998 RE: Proposed reservoir for Highline Water District at Crestview Park The Highline Water District has applied for an Unclassified Use Permit for the approval of a 7.6 million to 8.1 million gallon underground reservoir at Crestview Park. Unclassified Use Permits are decided by the City Council under the rules governing quasi - judicial proceedings. A City Council Public Hearing on the proposal is scheduled for October 5, 1998. As required under TMC 18.104, a Public Meeting will be held on July 22, 1998 at Foster High School Commons from 5:30 - 7:30 p.m. Representatives from Highline Water District will be at the meeting to present the specifics about the proposal and to answer any questions from the public. City staff will also be available to address any questions regarding the review process. Due to the quasi-judicial nature of this issue, it would not be appropriate for Council members to attend the July 22 meeting. However, should you have questions on this matter, please feel free to call me at 431 -3670. cc: Lucy Lauterbach 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 ..,,. z w; uj U', UO: co N w • w.=; J I- LL w O; u.¢ D; =; :z w~ o N: w • 1--U u.•0•, w z: U z CITY OF TUKWILA DEPARTMENT OF COMMUNITY DEVELOPMENT 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431 -3670 AFFIDAVIT OF INSTALLATION AND POSTING OF PUBLIC INFORMATION SIGNS) State of Washington County of King City of Tukwila RECEIVED JUL 8 7998 COMMUNITY DEVELOPMENT I 6'a;- i v) (Print Name) understand that Section 18.104.110 of the Tukwila Municipal Code requires me to post the property no later than fourteen (14) days following the issuance of the Notice of Completeness. I certify that on J (Ah., /, 1/V. the Public Notice Board(s) in accordance with Section 18.104.110 and other applicable guidelines were posted on the property located at / C 2o 0 �i2h.� 4fr4htiK, fL,k -Li; so as to be clearly seen from each right -of -way providing primary vehicular access to the property for application file number I- 9d —o ' 3 if SUBSCRIBED AND SWORN to before me this 7 ▪ day of = : j NOTARvm . - �SIQi giant / Applic t Signature) ,19 96 • *' yl : NO 1 'T'IC in and for the State of Washington 1. n� :' 1'UBUC t ';,' Was. 0:-∎. residing at A ?U Mj 1bN j w My commission expires on 21 9 2-002- .. ..,. z <W. J U: 00. CO w; • W =; w • O'. LL j. cy F- l.- Z 01—. UJ U 0H.. :you; W U ; tt. r'• O: • • W Z: • • O .Z • A F F I D A V I T D Notice of Public Hearing Li Notice of Public Meeting Q Board of Adjustment Agenda Packet fl Board of Appeals Agenda Packet fl Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet O Notice of Application for Shoreline Management Permit 0 Shoreline Management Permit O F D I S T R I B U T I O N hereby declare that: 0 Determination of Non - significance 0 Mitigated Determination of Nonsignificance 0 Determination of Significance and Scoping Notice LI Notice of Action O Official Notice 021()(ther c0T1(E- OP Cgi►M'L 0 Other was mailed to each of the following addresses Name of Project —Argt -t xt 1)3YYret File . Number L"t g • on V �,� ..Q Igg8 Y gal- gnature ■Ad..1 1A _....V...w'- .. . elorx ru :Y . m-reim iGIcud;'.'c.' i;5'vs; W.',Ai4iiV City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director NOTICE OF COMPLETE APPLICATION June 26, 1998 Thomas F. de Laat Parametrix 1231 Fryar Ave P.O. Box 460 Sumner, WA 98390 -1516 RE: Application for an Unclassified Use Permit for a water reservoir for Highline Water District at Crestview Elementary School (L98 -0034) Dear Mr. de Laat: Your application for an Unclassified Use Permit to install at 7.6 to 8.1 million gallon reservoir, as referenced, has been determined to be complete on June 26, 1998 for the purposes of meeting state mandated time requirements. The project will require a Public Meeting and a Public Hearing before the City Council. We have not determined a specific date for either the meeting for the hearing, but will keep you advised during the substantive review process on an appropriate date. The next step is for you to install the notice board on the site within 14 days of the date of this letter. You received information on how to install the sign with your application packet. If you need another set of those instructions, you may obtain them at the Department of Community Development (DCD). Also, you must obtain a laminated copy of the Notice of Application to post on the board. This notice is also available at DCD. After installing the sign with the laminated notice, you need to retum the Affidavit of Posting to the our office. This determination of complete application does not preclude the ability of the City to require that you submit additional plans or information, if in our estimation such information is necessary to ensure the project meets the substantive requirements of the City or to complete the review process. I will be contacting you soon to discuss this project. If you wish to speak to me sooner, feel free to call me at 206 -431 -3685. Sincerely, Michael Jenkins Assistant Planner cc: Reviewing City Departments Michael 011ivant, P.E., Parametrix Gary Maynard, Parametrix 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 4313670 • Fax (206) 431-3665 i/{ �. :�tC��i�:.£�Mi'F1V.l:KtA�1•Ae�. W i!rA?1' zerri 4 U •di n' {*4-4.% iil` $ti !i{4i at .W.' 1Y.CtrW ��J +. i.K �±• Z r=—z w. 6 2 JU oo �w w=; w 0 • U Q. I- _ z�.; I-o Z I.—. w w U� - O :0 H. w w Z ui 0H z Parametrix, Inc. 1231 Fryer Avenue P.O. Box 460 Sumner, WA 98390 -1516 253 - 863 -5128 • Fax: 253- 863 -0946 Ll June 25, 1998 PMX #21-2714-01/141 Mr. Mike Jenkins City of Tukwila 6300 Southcenter Boulevard Tukwila, WA 98188 Consultants in Engineering and Environmental Sciences RECEIVED N u-. CITY OF TUKWI1_A W O JUN 2 5 1998 2 Q Re: Unclassified Use Permit, Highline Water District y> Proposed Crestview Reservoir ���� 6�f�fi €� = ?:. Z Ill uj. r. Jenkins: 1-- z; It is Parametrix understanding that the City of Tukwila needs some supplemental information to properly . o evaluate the Highline Water District's proposal for the 7.6 million gallon water reservoir. The additional vi information requested includes: ;0 H' ,= W' • A conceptual landscape plan for the Park area over the proposed reservoir along with i--' F.: minimum restoration requirements for the school demolition area. O' U N`. • A copy of the geotechnical report for the proposed water reservoir. 0 �; z. • Figure 1 showing off -site utility improvements along the easement to the north of the Dear M reservoir and along South 160th Street. As requested by the City and on behalf of the Highline Water District, we are providing 12 copies of the proposed landscape plan, 4 copies of the final draft geotechnical report prepared by Landau Associates Inc., and 12 color graphics at 1 " =20' showing the off -site utilities that are contained within the City of Tukwila Corporate Limits. The City of Tukwila inquired on a grading plan and cross section of the reservoir. Our original submittal, sheets 4 and 5, contained proposed grading contours and cross section through the reservoir and fill slope. If the City needs more vertical information, please call and we will provide additional cross sections. The City of Tukwila also inquired on the haul route proposed for use by the excavation Contractor and the impact to neighboring residential streets. The haul route for both the Contractor selected to demolish the Crestview School and the Contractor constructing the reservoir will be within Seatac City Right -of- Way. Parametrix will include the following provisions within the contract documents for demolition and reservoir construction: .4v • The Contractor shall provide to the engineer a Haul Plan defining the haul route from the job site to the disposal site or sites. The Contractor shall exit the job site through the existing ingress and egress roadway of the school then proceed south on 42nd Avenue Printed on Recycled Paper Mr. Mike Jenksins June 25, 1998 Page 2 South to Military Road. Utilizing Military Road, the Contractor shall define his haul route and be responsible for procuring a haul permit from City of Tukwila and/or the City of Seatac, depending upon the proposed location of the disposal site or sites. The Contractor will not be allowed to dispose of either demolition debris or excavation spoils in any Port of Seattle property. I have included 12 copies of this letter to address the Cities concern regarding haul impacts. Please review the information provided. If there is additional clarification or information needed, please feel free to call us at (253) 863-5128. Very truly yours, PARAMETRIX, INC. Micha . 011ivant, P.E. Project Engineer MTO:tlw cc: Keith Harris P.E. - Highline Water District (w/2 copies) Tom deLaat - Parametrix, Inc. Gary Maynard - Parametrix, Inc. Al Schmit - Highline School District (w/encl.) • : . ..;=1 • • -•.;'4 • • TO: FROM: DATE: SUBJECT: City of Tukwila 6200 Southcenter Boulevard • Tukwila, Washington 98188 MEMORANDUM Michael Jenkins, Assistant Planner Don Williams, Parks and Recreation Director, June 24 1998 Crestview Reservoir Unclassified Use Permit Application Comments John W Rants, Mayor 1 do not care to make the "tail wag the dog" but it appears, based on comments on Page 3 of the application cover letter, there are some conflicts. The Parks and Recreation Department, Highline Water District, and Highline School District staff met and have agreed in principle to what is proposed by the Highline Water District, but nothing has been put in writing. 1 request the following be provided to my department before the Parks and Recreation Department can allow the proposed use and the construction of the water tank: A. A letter from the Highline School District that requests the City add to the existing lease that portion of the site where the school building and parking lot exists. That it is understood the City would operate the new area as a public park only after improvements are completed by the Highline Water District which must meet park design requirements by the City. If the park improvements are not made, the City will not lease the land. A letter from the Highline Water District that commits the district to fully restore the existing park area that will be disturbed and will meet all conditions required by the Department of Community Development for new project areas (irrigation, erosion control, etc.). Furthermore, if currently unleased land is leased by the City from the school district, the Highline Water District shall make all park improvements to the areas to be leased. Park -type improvements will be determined through the City's normal process of public meetings, Park Commission and Administration recommendations, and Council's final adoption. 1 believe these two letters are necessary to show each district's commitment to work with the City and to ensure the City will not have to pay for the capital improvements. The letters should be received prior to the review of the Unclassified Permit Application and should be referenced in the application. cc: Jack Pace, Senior Planner park /tankprj Phone: (206) 433 -1800 • City Hall Fax: (206) 433 -1833 • • ' .. ' ...., Community and Parks Committee . ‘ Monday, June 22, 1998 . . . • , • • 5:00 p.m. - • • • Agenda . . .. „ Agenda items ..1.Highline Water Tank and '...., .=, - .`.”- Potential New Park. . ._.- .. -. - .- - . • _., , . • .,, . .... ;,.., - : ...,..,.,;, L. 2. Crandall Aramburu Contact .;;;;:,'i'•-•; tOi Light Rail Station . :::/:,-- ' , Planning =.,. : ''' , „.,,......,,,,,- , .:,-,:.. :.,. "„.,'' .c.,;.:..'..s-,-!. . • ..,,.. , ,.' • .,,, - ,, ,,, ,,,.,. -.4, .. 4 try: A i'•', ,., 1/4 t, r..1'~-f ., ii. A. , .., 4— v- ...,4 -..t.%) -a -...vt , . -c, c, '4 ... V . '''.. 4 '44,1 '' Wi' . '..,I. ;. 3 '''., Matinfactiliiribilnduelrial, MICY: ' • • ' ''. ,,,Nul,,-. , -, -.! .t , ...."'`;' - lin and Proaese..41' 4 ''''' • , , .- ,:, ,,..: . , 4. VVIiit elie , •_-,,,---.:1.,, „... -,, • .•,.,'i, . .:,•.i,..-..i.-,--...--..,,,•.- ... re : .r.,-;,,,;.-- — . , a • .: "..rtt:. • Action Don will talk about what is planned for the old Crestview Park, and the City's role in the proposed new park. , ::: .:.,.., .....-.--, • As was discussed at the last 'C& P . meeting, the contract for study of the light rail isTeady.for Council. You can pave the iiidifOi. that to go smoothlY.;at:the.7, p.m. meeting , ,.,,-...,..,.. ..:- ....:,- ,.=:.:,,,,,--:: .,, , ' . t .=.■ '"4 ...., ,i. . ' t ..., ..,' _ ..., , ' - ' -, .....'1C.'?,.."., '. ., ,Si.a.ff, ,:Witi discuss the for.,11:1,e, ,p,..lanzt,,,,,I, 'and' begin tawork it through the process in -,,,. ,..- ,.. - •••-. -,-; .. -,,...! .• , .. . _ • .,-......„,::::-,',1.;.%-...--,:=, 'coinrnittee.,;::,' -.4,--•-• .. :s.- ,-,:',.;': . . .. . . . ,.`5.'... . . , • • - - 0 • -64 City of Tukwila strives to accommodate persons with disabilities. Please call Lucy Lauterbach - . . ' :- at 433-1834 if you need special accommodations. , , , TO: FROM: DATE: SUBJECT: City of Tukwila 6200 Southcenter Boulevard • Tukwila, Washington 98188 MEMORANDUM Mayor Wally Rants Don Williams, Parks and Recreation Director June 19, 1998 Highline Water District Water Tank Proposal and Expanded Crestview Park Expansion John W Rants, Mayor Proposal The Highline Water District is seeking an Unclassified Use Permit to construct an 8 million gallon water tank within the grounds of Crestview Park. For this to happen, our City Council must grant the Unclassified Use Permit which most likely will have various conditions imposed if it is approved. Further, the Highline School District, as a condition for the water district to use their land, is requiring the water district to demolish the old school buildings. The school district would like the city to accept an expansion of our current park lease agreement and, with the help of the water district, develop and maintain the new park area. During discussion with both districts, I have told them the Mayor and City Council must approve the expansion of our park and accept the new park area. I've also stated the new park area must be designed to meet our approval and meet our construction standards. Discussion It has been my assumption the city will approve the tank's construction and the addition of the new park area, about three acres. Attached to this memo is a copy of Page 3 of the water district's initial Unclassified Use Permit Application. In short, it states the water district will reconstruct disturbed existing park facilities and construct a park in the area of the school buildings. However, the water district does not want to design the park until the Unclassified Use Permit is granted and negotiations are completed between the two districts. In other words, if the city approves the construction of the tank we must be sure of what conditions the city will require. To know what this new park area will include as amenities typically requires several steps: A. Citizens are asked for their suggestions. B. Park Commission makes recommendations. Phone: (206) 433 -1800 • City Hall Fax (206) 433 -1833 ,' ' City of Tukwila June. 1, 1998 Page 3 • A Landscape Plan has not been included with this application. As the City is aware, a major part of the Crestview Elementary School site is leased by the Ciry of Tukwila for use as a City Park. Not included in this leased park area is the land currently occupied by Crestview school buildings. With the demolition of the school buildings, there is a potential for additional land area to become part of the leased land maintained and operated by the City's Parks and Recreation Department. This potential, along with negotiation (agreement) between the City of Tukwila as Lessee and the Highline School District as Lessor, to address the proposed construction on the leased park land is yet to occur, and likely will follow soon after the negotiation between the two Highline Districts' is finalized. It is fully understood that restoration of existing park areas and any new area made available as a result of the building demolition are subject to requirements and concurrence of the Parks and Recreation Department. We assume that building permits would not be issued without Parks and Recreation concurrence in the plan. At the same time, it is somewhat impractical to proceed with the development of a landscape plan meeting all of the Parks and Recreation requirements until such time as we are into the design phase of the project. Highline Water District prefers to have some concurrence from the City that they will be allowed to proceed with the use of the site before detailed design is initiated. Issues of tree replacement in accordance with the City's Tree Ordinance can also be better addressed during the landscape design period. It is hoped that the City can agree to this deferment of the landscape plan until the more appropriate time for this particular project effort, considering the activity of the many various parties required to participate. For informational purposes, it is envisioned that the entire 200- foot - diameter structure will be buried with approximately two feet of earth fill over the top of the reservoir cover. Grass, plants, and trees will be planted in this area, and once established, the area will look very much like it does today. Other surface improvements such as asphalt paths, benches, and the picnic shelter will be replaced in kind unless relocations are requested by the Cities Parks and Recreation Department. At the City's request, the District will delineate the clearing limits as shown on Site Plan in the field along with provide a list of size and species of trees anticipated to be remove and a list of trees to be replaced in accordance with the City of Tukwila Ordinance. With the City's concurrence, the location of the replacement trees may be better established after determining area restoration with Mr. Don Williams, the City Parks and Recreation Director. Information Not Applicable Some of the information requested within the City of Tukwila's Unclassified Use Permit Checklist is not applicable to this proposed project and has not been included. An explanation has been provided for each • item that was listed and is not included. If our interpretation is incorrect, we would be willing to address the City's concerns. Items not included within this Unclassified Use Permit Application are: MEMORANDUM TO: File FROM: Michael Jenkins DATE: June 18, 1998 RE: Unclassified Use Permit for Crestview Reservoir (L98 -0034) On June 16, 1998 I met with Gary Barnett, JoAnna Spencer and Don Williams concerning the completeness review of the referenced application. During my briefing on the proposal, Don Williams provided the following summary of Parks and Recreation existing and proposed agreements with the Highline School District concerning the Crestview Park portion of the property: • King County has a 40 year lease on the park • There is a popular viewing area in the park where users can see downtown and fireworks displays Irrigation for the playfields will be required as part of any new development, per Vern Umetsu's comments at the Pre - Application conference on this proposal • The existing baseball diamonds are quite popular and are continuously used by local little leagues • Any new park elements that are not developed for a local population may be met with objection by the neighborhood, due to perception that Park is local • Pad where school will be demolished will be used for park area • When and if McMicken Elementary is vacated, possibly in the next few years, the Highline School District may decide to construct a new school on this site. If that occurs, new school will probably be on footprint of former school, due to leasing agreement for park land • Parks and Recreation will get the new park components built to City of Tukwila Standard • z. Hz• � W! U o o :N cn W • W z: J F-: U) LL; w O. .u) d �_ z I- o • LIJ U �I. V'. erg. 0 • Ali N • U = • z...... Draft Geotechnical Report Proposed Highline Reservoir Tukwila, Washington June 16, 1998 Prepared for Parametrix, Inc. Sumner, Washington Prepared by rvz RECEIVED CITY OF TUKWILA JUN 2 5 1998 PERMIT CENTER LANDAU ASSOCIATES, INC. Wapato Creek Center • 4210 - 20th Street East, Suite F • Tacoma, WA 98424 -1823 • (253) 926 -2493 • TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 2.0 PROJECT UNDERSTANDING 2 3.0 EXISTING SITE CONDITIONS 3 3.1 SURFACE CONDITIONS 3 3.2 FIELD EXPLORATIONS AND LABORATORY TESTING 3 3.3 GEOLOGIC SETTING 4 3.4 SUBSURFACE CONDITIONS 4 3.4.1 Soil 5 3.4.2 Groundwater 5 4.0 CONCLUSIONS AND RECOMMENDATIONS 4.1 SEISMIC DESIGN 4.1.1 Bedrock Peak Ground Acceleration 4.1.2 Site Amplification 4.1.3 Site Response Spectra 4.1.4 Liquefaction Potential 4.2 REUSE OF ONSITE MATERIAL AS BORROW 4.3 EXCAVATION SUPPORT 4.3.1 Sloped Excavations 4.3.2 Tieback Soldier Pile Wall 4.3.3 Soil Nail Wall 4.4 FOUNDATION SUPPORT 4.5 FLOOR SLAB SUPPORT 4.6 ESTIMATED SETTLEMENTS 4.7 BELOW -GRADE WALLS 4.8 EARTH PRESSURES 4.9 RESISTANCE TO LATERAL LOADS 4.10 INFILTRATION 4.11 INTERCONNECTING PIPING 4.11.1 Trench Excavation 4.11.2 Pipe Foundation Support 4.11.3 Pipe Bedding and Backfill 4.11.4 Loads on Pipes 5.0 DOCUMENT REVIEW AND CONSTRUCTION OBSERVATIONS 6.0 USE OF THIS REPORT 7.0 REFERENCES 06! 16/98 l:\PROJ EC11193 \01 3.20U-1UGHLQVE.RPT 5 6 6 6 7 7 7 8 8 10 11 13 14 14 15 16 16 18 18 18 19 19 20 21 21 23 DRAFT z 1—w ne 0 0 0 o, v� w; Ill =: Nu_ wO w < -a zf; I- 0': w 0 V'N O 0 1-; w W_ - off z; v O_~ Z APPENDICES APPENDIX A APPENDIX B APPENDIX C APPENDIX D Vicinity Map 2 Reservoir Site and Exploration Plan 3 Interconnecting Piping Site and Exploration Plan 4 Site Response Spectra 5 Typical Soldier Pile Tieback Anchor Wall 6 Typical Soil Nail Wall Traffic Loads on Pipes FIELD EXPLORATIONS LABORATORY TESTING TIEBACK ANCHOR AND SOIL NAIL TESTING AND ACCEPTANCE IMPROVEMENTS TO SOUTH 160TH STREET BORING LOGS LIST OF FIGURES 06/16/98 1:\PROJ EC11193\013.201HIG H LIN E. RPT :, .»..., DRAFT • :re 21 .u6 Jof • UO; ,co cn wi D.. • w =, Jam. wO. • •J ?. ,1—w. =t. Z • Z Ot 0cn: • a0 utw Zr • 0. 1.0 INTRODUCTION This report presents the results of our field investigations and provides geotechnical engineering conclusions and recommendations for design and construction of the proposed Highline Reservoir, which is planned to be located at the northwest corner of Crestview Park in Tukwila, Washington. The purpose of this investigation was to obtain subsurface information to develop geotechnical conclusions and recommendations in support of design and construction of the reservoir. The project location is shown on the Vicinity Map, Figure 1. The Reservoir Site and Exploration Plan, Figure 2, shows the reservoir project area and the approximate location of the explorations completed for the reservoir. The Interconnecting Piping Site and Exploration Plan, Figure 3, shows the remainder of the project area and the approximate location of the explorations completed for the interconnecting piping. Appendix A presents a description of the field explorations and summary logs of conditions observed in the explorations. Appendix B presents a description of the laboratory testing program and results of the laboratory testing. Appendix C provides recommendations for tieback anchor and soil nail testing. Landau Associates, Inc. was contracted by Parametrix, Inc. to provide geotechnical services to support the project. Our services were provided in accordance with the scope outlined in our November 18, 1997 proposal, and Standard Subconsultant Agreement for Professional Services between Parametrix, Inc. and Landau Associates dated December 2, 1997. To support the proposed project, Landau Associates provided the following specific services: • Completed four borings to depths of between 591/2 and 791/2 ft below existing site grades to characterize subsurface soil and groundwater conditions at the reservoir site. Completed three borings along South 160th Street to depths of about 161/2 ft below existing site grades to characterize near - surface conditions along the proposed route of the connection pipeline. Representative soil samples from the borings were obtained and returned to our laboratory for further classification and testing. • Completed a limited geotechnical laboratory testing program on selected soil samples obtained from the borings to aid in classification, and to determine pertinent engineering properties of the site soil. Laboratory testing included natural moisture content determinations and grain size analyses. • Completed geotechnical engineering analyses and developed geotechnical engineering conclusions and recommendations for design and construction of the proposed reservoir and connection pipeline. Recommendations include: - recommendations for site grading, including support of temporary excavations (e.g., soil nailing, temporary tieback wall), configuration for temporary excavation slopes, reuse of onsite soil for fill, gradations for import fill, and backfill and compaction criteria 06/16/98 I:\PROJECI1193\013.20W IGHLINE.RPT 1 DRAFT recommendations for foundation support of the reservoir, and estimated total and differential settlements lateral earth pressure recommendations for design of below grade walls, and soil unit weight for computing vertical loads on the reservoir roof recommendations regarding resistance to lateral loads, including passive soil resistance and friction seismic design considerations, including recommended values for peak horizontal and vertical ground acceleration, site specific response spectra for 0, 2, 5, and 10 percent damping, dynamic lateral earth pressures, and a discussion of site amplification and liquefaction potential recommendations for construction of the interconnecting piping, including trenching, foundation support of pipes, gradations for trench backfill material, and trench backfill and compaction criteria a discussion of construction considerations. • Prepared and submitted this geotechnical design report summarizing our findings, conclusions, and recommendations for the project. The report includes a discussion of existing subsurface conditions within the project area, groundwater data, a site plan showing the approximate exploration locations, and summary logs of conditions encountered at the exploration locations. 2.0 PROJECT UNDERSTANDING We understand that the proposed project will consist of design and construction of a buried, 7.6- million gallon water reservoir in the northwest comer of Crestview Park; a pump station on the south side of South 160th Street, about 150 ft east of the intersection with Military Road South; and interconnecting piping. The reservoir is planned to be about 200 ft in diameter and about 35 to 40 ft in height. The interconnecting piping from the reservoir will extend to the north from the reservoir through an easement to South 160th Street. The drain will be tied into an existing sanitary sewer or storm sewer on South 160th Street, and a new pipeline will be constructed along South 160th Street to tie into the new pump station near Military Road South. The depth of the interconnecting piping as it leaves the reservoir will be on the order of about 30 ft below existing grades, becoming relatively shallow when the piping reaches South 160th Street. Soil cover over the interconnecting piping within the South 160th Street corridor is expected to be on the order of 3 to 4 ft. The project features are illustrated on Figures 2 and 3. 06/16/98 1:\PROJ ECi\ 193\013.201HIG HLINE. RPr 2 DRAFT 3.0 EXISTING SITE CONDITIONS The following sections present a description of the existing surface features, and a discussion of near - surface, soil and groundwater conditions. Our assessment of existing site conditions is based on visual observations, review of available geologic maps of the area, and conditions observed in explorations completed for the project by Landau Associates. 3.1 SURFACE CONDITIONS The site of the proposed reservoir is located near the top of a generally north -south trending ridge along the west margin of the Green River Valley. The overall site topography slopes downward to the north. As illustrated on Figure 2, the south portion of the site is occupied by the abandoned Crestview Elementary School and the remainder of the site is occupied by Crestview Park. The northwest portion of the reservoir site is vegetated with mature conifer and deciduous trees, with a moderate undergrowth of vegetation typical of western Washington. The remainder of the reservoir site is vegetated with grass. The route of the interconnecting piping extends north from the reservoir though a residential lot to South 160th Street. The easement generally follows a gravel driveway, and the topography along the easement slopes downward from the reservoir to South 160th Street. South 160th Street consists of an asphalt -paved roadway with curbs, sidewalks and gutters east of 42nd Avenue South, and gravel shoulders west of 42nd Avenue South. The topography along South 160th Street slopes generally upward to the east from 42nd Avenue South, and is relatively level west from 42nd Avenue South. 3.2 FIELD EXPLORATIONS AND LABORATORY TESTING Subsurface conditions at the site of the proposed reservoir were explored on December 2 and 3, 1997 by completing four borings, B -1 through B-4, to depths of about 60 and 80 ft below the existing ground surface. Subsurface conditions along the proposed route of the interconnecting piping were explored by completing three borings, B -5 through B -7, to depths of about 161/2 ft below the existing ground surface. The borings were drilled by Holt Drilling, Inc., of Puyallup, Washington (under subcontract to Landau Associates) using a truck- mounted drill rig advancing hollow -stem augers. Boring locations were determined in the field by pacing and taping from existing site features; therefore, the location of borings shown on Figures 2 and 3 should be considered approximate and may vary from those locations shown on the figures. Details of the exploration program are summarized in Appendix A of this report, and summary logs of the conditions 06/16/98 1:1PROJECr119310 t3.201HtGHLINE.RPT 3 DRAFT # '�'<, °: : encountered in the explorations are presented on Figures A -2 through A -8 in Appendix A . A key to the terms and symbols used on the summary logs is included as Figure A -1. Landau Associates completed a geotechnical investigation in 1991 for improvements to South 160th Street. Boring logs from that investigation are included in Appendix D. The approximate boring locations are shown on Figure 3. Geotechnical laboratory testing consisted of natural moisture content determinations on soil samples from the borings and grain size analyses on selected samples from the borings. The results of the moisture content determinations are shown on the summary logs in Appendix A, and the results of the grain size analyses are shown on Figures B -1 through B -5 in Appendix B. Appendix B provides a description of the laboratory testing methods. 3.3 GEOLOGIC SETTING The project site is situated along the east margin of a broad glacial upland area bounded on the west by Puget Sound and on the east by the Duwamish River Valley. The surficial geology in the project area was originally mapped by Waldron (Waldron 1962) as Vashon -age glacial recessional outwash. This designation appears to have been carried forward by Galster and Laprade, who produced a surficial geologic map of the Seattle area (Galster and Laprade 1991). Glacial recessional outwash is a glaciofluvial sediment deposited as the last ice receded, and hence the deposit was not overridden by the ice sheet. Glacial recessional outwash is generally loose to medium dense. Based on our reconnaissance of the project area, soil conditions observed in the borings completed for the project, and our understanding of the general glacial geology in the mid -Puget Sound region, is appears that the unit was misidentified during the original mapping of the surficial geology. The unit was observed in the borings to be in a dense to very dense state, which is typical of a glacial advance outwash deposit. Glacial advance outwash is also of glaciofluvial origin, but is deposited in front of the advancing ice sheet, which overrides the deposits, producing a highly compact unit. Glacial advance outwash is generally similar in composition and texture to glacial recessional outwash. In Landau Associates' opinion, the glacial unit that underlies the site is a glacial advance outwash. 3.4 SUBSURFACE CONDITIONS The following summarizes the near- surface soil and groundwater conditions encountered in the explorations at the site. 06/16198 L \PROJECI\I93 \013.20 FUG HLINE.RPT 4 DRAFT — Z zH. w r4 2 u6D U- U0 co O wI N LL W 0: gQ' CO D = 0: _. Z I— 0 Z H' CU a U� U: :0E-. W; U _ Z. iii 0 ~` Z �. 4.1 SEISMIC DESIGN • We understand that seismic design of the reservoir will be in accordance with American Water Works Association (AWWA) criteria and the 1997 Uniform Building Code (ICBO 1997). We understand that the reservoir's primary function will be for equalization. If the reservoir should be used for fire safety, then the following sections provide the minimum criteria for seismic design of the reservoir. 4.1.1 BEDROCK PEAK GROUND ACCELERATION If the proposed reservoir is considered an essential facility per Table 16 -K of the 1997 Uniform Building Code (UBC), Section 1631.2 of the 1997 UBC requires that they be designed for ground motions produced by an earthquake with a 10 percent probability of occurrence in a 50 -year period. Several published seismic risk maps for the Puget Sound region, corresponding to a 10 percent probability of exceedence in a 50 -year period, were reviewed and the following horizontal bedrock ground accelerations are interpreted from the maps: Horizontal Ground Acceleration Coefficient for the Highline Reservoir Area Source 0.30 ICBO 1997 0.31 (Acceleration- related) ASCE 1996 0.29 (Velocity - related) 0.30 0.28 AASHTO 1996 WSDOT 1996 Most of the recent seismic risk mapping indicates an acceleration coefficient for a bedrock site of about 0.30g for the proposed Highline Reservoir area. The WSDOT value is slightly lower, but is based on older mapping that does not reflect recent advances in the understanding of seismic risk in the Pacific Northwest. Given the above seismic risk mapping results, we recommend use of an effective peak bedrock horizontal ground acceleration of 0.30g. The vertical acceleration can conservatively be assumed to be two - thirds of the horizontal acceleration. 4.1.2 SITE AMPLIFICATION Depending on soil conditions at a site, amplification of bedrock ground motions can occur as the seismic waves propagate upward through the soil column. Cohesive soil and deep deposits of cohesionless 06/16/98 I:\PROJECI1193 \01320W IGHLINE.RPT 6 .. DRAFT soil tend to amplify bedrock ground motions, whereas areas where bedrock is within a few hundred feet of the surface are generally not as susceptible to ground amplification. Near - surface conditions at the site consist of very dense glacial soil, and bedrock reportedly underlies the site at a depth of over 600 ft (Buchanan -Bank and Collins 1994). Therefore, some amplification of bedrock ground motion will probably occur, and a peak horizontal ground acceleration of 0.33g should be used for design. Soil Profile Type Sc, as defined by UBC, should be used for seismic design of the reservoir. The corresponding seismic coefficient for use in describing a UBC response spectra would be C. = 0.33 and C, = 0.45 (ICBO 1997). 4.1.3 SITE RESPONSE SPECTRA A site response spectra for a single degree of freedom system was developed using the Newmark method (Newmark and Hall 1982) for a peak horizontal ground acceleration of 0.33g, and for critical damping levels of 0, 2, 5, and 10 percent. The peak horizontal ground acceleration includes the effect of ground amplification. The site response spectra is presented on Figure 4. The UBC method, Figure 16 -3 in 1997 UBC, could also be used to develop a design response spectra. 4.1.4 LIQUEFACTION POTENTIAL Near- surface conditions at the site consist of very dense glacial soil; groundwater was not encountered to the depth explored (about 80 ft) at the reservoir site. Glacially - consolidated soil is not considered to be prone to liquefaction during a seismic event. Because of the very dense soil and absence of groundwater, liquefaction of the site soil during the design earthquake is considered to be improbable. 4.2 REUSE OF ONSITE MATERIAL AS BORROW As part of our scope, Landau Associates evaluated the suitability of the onsite soil for use as a borrow source. The following summarizes our evaluation. Grain size analyses of selected soil samples from the borings indicate that soil from the reservoir excavation would not meet the gradation requirements for Gravel Borrow as defined in Section 9- 03.14(1) in the 1998 WSDOT /APWA Standard Specifications. Though the onsite soil has a relatively low fines /content, generally less than 10 percent, the amount of fine to medium sand (material passing a U.S. No. 40 Sieve) is generally 40 to 70 percent by dry weight, which is in excess of that allowed by the specifications (30 percent maximum). Portions of the excavated soil will meet the requirements for Select Borrow, as defined in Section 9- 03.14(2), which allows up to 50 percent passing the U.S. No. 40 06/16/98 1:\PROJ EC\ 193\013.20\i11GHUN E. RPT 7 DRAFT sieve. Alt of the soil will meet the requirements for Common Borrow, as defined in Section 9- 03.13(3) of the 1998 WSDOT /APWA Standard Specifications. 4.3 EXCAVATION SUPPORT The excavation to construct the reservoir is planned to extend up to about 40 ft below existing site grades. Based on conditions observed in the borings, feasible excavation alternatives include sloped excavations, a combination of a cantilevered wall and sloped excavations, a soldier pile and lagging wall with tieback anchors, and a soil nail wall. The following sections provide recommendations for these various methods of excavation support. 4.3.1 SLOPED EXCAVATIONS The native sand to the depth explored was observed to be in a moist condition with relatively little fines (material passing a U.S. No. 200 sieve). Long -term temporary excavation slopes in the native sand soil should be sloped at about 11/2H:1 V to limit sloughing and raveling as the exposed soil on the face of the temporary excavation slope dries. In addition, the exposed soil will be highly erodible. We recommend that the slope face be covered with plastic (or other approved measures) to protect the soil face from precipitation and drying. Applying a layer of shotcrete to the face of the temporary excavation slope would prevent raveling and sloughing, and could allow for steeper temporary excavation slopes. With the face of the excavation slope protected, we recommend that temporary excavations be sloped no steeper than 1 H:1 V. Temporary excavation slopes should be the responsibility of the contractor. All applicable local, state, and federal safety codes should be followed. Temporary excavation slopes should be monitored during construction for evidence of instability, and if detected, the contractor should flatten the temporary excavation slope or install temporary shoring in accordance with the recommendations in the following sections. For a 40 -ft deep excavation, the horizontal extent of a temporary excavation sloped at 11/2H: l V will be on the order of 60 ft. The horizontal extent could be limited by constructing a cantilevered soldier pile wall at the base of the excavation. For the combination of a sloped excavation and cantilevered shoring, we recommend that the temporary excavation slopes above the shoring wall be no steeper than 11/2H:1 V. The exposed soil should be protected from the elements as recommended above. The soil parameters in the table below may be used for design of a cantilevered shoring wall by either the free -end or fixed -end method. 06/16/98 I:\PROJECI1I93 \0I3.20W IGHLINE.RPT 8 DRAFT z : W JU 0 0; N0. • w =' J � .W 0' • �-J D d: • F=- _, Z I- 0 ZH .2 D.. U co: 0t- tu . 1--- —' Z: F- 0I z Parameter RECOMMEND DESIGN PARAMETERS CANTILEVERED SHORING WALL Recommended Value Remarks Active Lateral Earth Pressure (1 I/ H: l V backslope) Passive Soil Resistance 50 pcf Acts over one pile spacing above the base of the excavation and one pile diameter below the base of the excavation. 350 pcf Acts over two pile diameters or one pile spacing, whichever is less. The upper 1 ft of passive resistance should be disregarded in design. The allowable passive resistance has been reduced by a factor of 1.5 to limit wall deflections to less than 3 percent of the embedded depth. Typical types of cantilevered walls include driven interlocking sheet piles and H -piles with wood lagging. Because of the very dense nature of the sand deposit, driving of sheet piles will require a large vibratory hammer and it will likely be very difficult to achieve sufficient penetration to develop the required passive resistance. In addition, the driving of sheet piling may result in unacceptable vibration levels in the site vicinity and increased raveling and sloughing of temporary excavation slopes. If a cantilevered wall is considered, we recommend that it be constructed using steel H -piles and wood lagging. For economic reasons, cantilevered walls are generally limited to about 10 to 14 ft in height, depending on backslope and foreslope conditions. Higher walls are usually provided with tieback anchors to reduce the size of the H -pile needed to resist the bending moments. Recommendations for tieback walls are provided in Section 4.3.2 of this report. H -piles would be installed by augering a hole to the required depth, setting the H -pile into the hole, and filling the hole with grout. If caving occurs during augering, then casing or other methods will be required to stabilize the hole. The hole from the pile tip to the anticipated base of the excavation is typically filled with a structural grout, while the portion of the hole extending above the anticipated excavation base is tilled with a low- strength grout to allow removal of the grout from around the pile so the lagging can be attached as the excavation proceeds downward. Wood lagging, typically 3 to 4 inches thick, is placed between the H -piles and restrained by the flanges. Because of bridging between adjacent piles, we recommend that 50 percent of the applied active earth pressure be used to size the lagging. In addition, we recommend that no more than 5 vertical feet of unsupported soil be exposed during installation of the lagging. Voids behind the lagging 06/16/98 I :pPROJECI1193\0I3.20 HIGHLINE.RPT 9 DRAFT should be backfilled with either a non - structural mixture of sand, water, and fly -ash, (locally referred to as "gunk "), or Controlled Density Fill (CDF) having an unconfined compressive strength of at least 300 psi. 4.3.2 TIEBACK SOLDIER PILE WALL Support of temporary excavations may also be provided by a tied -back soldier pile wall with wood lagging. The wall would be constructed in a similar manner as described above for a cantilevered wall, but additional lateral support would be provided by tieback anchors extending into the formation around the excavation. We recommend that temporary tieback anchors be installed by means of pressure grouting. The anchors may be drilled by open hole methods if the hole does not cave. If caving occurs, the hole should be cased. Centralizers should be placed on the grouted portion of the anchor to keep the tendons in the center of the hole. The portion of the anchor hole within the no load zone, as defined on Figure 5, should be backfilled with a non - structural mixture of sand, water, and fly -ash, and the tendons encased in PVC pipe to prevent load transfer in this portion of the anchor. Assuming the above construction sequence for a tieback wall with two or more rows of tiebacks, a level backslope behind the wall, and drained backfill conditions, the portion of the wall that extends above the base of the excavation should be designed to resist a uniformly distributed lateral earth pressure of 18 H psf (H is the vertical height of the wall). From the top of the wall to a depth of 0.20 H, the lateral earth pressure can be assumed to increase from zero at the ground surface to the maximum of 18 H psf. For cantilevered soldier pile sections, or when the loading is such that the wall behaves as a cantilevered wall, such as for a single row of tiebacks, the lateral earth pressures are better approximated by a triangular pressure distribution corresponding to an equivalent fluid weight of 27 pcf for level backslope above the wall to 50 pcf for a 1.5H:1 V backslope above the wall. The lateral earth pressures given above are assumed to act over one pile spacing. The portion of the wall extending below the base of the excavation should be designed to resist an active lateral earth pressure equivalent to that of a fluid with a density of 27 pcf. The lateral earth pressure for the portion of the wall below the base of the excavation is assumed to act over one pile diameter. Lateral loads on the wall will be resisted by the tieback anchors and passive earth pressure acting on the embedded portion of the H- piles. The available allowable passive resistance can be computed based on an equivalent fluid density of 350 pcf. The upper 2 ft of passive resistance should be disregarded in design. The allowable passive resistance has been reduced by a factor of 1.5 to limit wall deflections to less than 3 percent of the embedded depth. Passive earth pressures are assumed to act over two pile diameters or one pile 06/16/98 1 \ PROJECI1193W013.20\HIGHL1NE.RPr 10 DRAFT .._...._... z F- W _1 0: 00: N0. 111 X IL J � w O: 11.. O- H. 2V'. UL. O. ti.Z U2 z 1 spacing, whichever is less. The lateral earth pressure distribution on a tieback soldier pile wall with two or more anchor levels is illustrated on Figure 5. Tieback anchors installed by means of pressure grouting can typically obtain ultimate unit soil pullout resistances in the range of 6 to 10 kips per square foot (ksf) in glacially consolidated soil. Gravity grouted anchors installed in glacial soil can typically obtain an ultimate unit soil pullout resistance of 2 to 3 ksf. Actual ultimate unit soil pullout resistances are a function of soil type, groundwater conditions, construction methods, and other factors. Allowable anchor pullout resistance should be determined to achieve a minimum factor of safety of 2.0. Actual anchor lengths will be determined during construction based on the results of a 200 percent verification test, which is described in Appendix C of this report. At least one tieback anchor per tieback row should be subjected to a 200 percent verification test to verify that the design tieback pullout resistance has a minimum factor of safety of 2.0, and all production anchors should be tested to at least 130 percent of the design load to verify the structural components of the anchors. The 200 percent verification test may be performed on one of the production tiebacks. The tendons on the no load portion of the anchor should be encased in PVC to prevent load transfer during the test. Recommendations for tieback anchor testing are presented in Appendix C of this report. Tieback anchors should not be destressed until the wall has reached the height of the tieback to be destressed and has gained the necessary strength to support the lateral earth pressure. If the wall is not poured against the shoring wall, then tieback anchors should not be destressed until the level of backfill has reached the tieback anchor level. 4.3.3 SOIL NAIL WALL Soil nailing is an earth retention system that combines relatively short in situ reinforcements and shotcrete to support the excavation face. The reinforcements consist of steel members that are usually installed in pre- drilled holes and then grouted into place. A relatively large number of soil nails are installed in a grid pattern that reinforces the soil into a stable block, which supports the unreinforced soil behind it in a manner similar to that of a gravity wall. It is important to understand that the soil nailing reinforcement is not installed in the same manner as tieback anchors (which is described above), and functions in a somewhat different manner. While both soil nails and tieback anchors have anchorage zones, the soil nails are grouted over their full length and create a bond between the reinforcement and the soil on both sides of a critical failure plane. Usually, only a small portion of the anchor load is transferred to the wall face. Tieback anchors, on the other hand, are not grouted 06/16/98 1:1PROJ ECII 193\ 013.20\HIGHLINE.RPT 11 DRAFT full length and are designed to transfer high Toads from the wall face across the no -load zone to beyond the critical failure surface. The construction of soil- nailed excavation walls on this project would in general consist of: 1) completing the excavation in lifts of about 4 to 6 ft in depth; 2) drilling holes for the nails into the soil; 3) placing and grouting the steel nails; 4) placing steel mesh reinforcement over the exposed soil face; and 5) covering the excavation face with shotcrete. This process is repeated until the excavation is completed. Figure 6 illustrates the typical elements of a soil nail wall. To limit the potential for raveling of the excavation face, each lift should be excavated, reinforced, and shotcreted as quickly as possible, and in no case should the unsupported stand time exceed 24 hours. It is our opinion that the soil underlying the site is suitable for the application of soil nailing. However, because of its variable nature, the surficial layer of soil may present installation difficulties. If room is available on the site, the upper 4 to 5 ft of the excavation could be sloped back in accordance with the recommendations in Section 4.3.1 of this report to increase the stability and reduce the potential for installation difficulties. If the exposed soil face is unable to stand unsupported to allow installation of the nails, modifications to the installation procedure may be required. Such modifications could include: 1) decreasing the lift depth; 2) reducing the unsupported standing time; or 3) modifying the installation sequence so that the reinforcing mesh and shotcrete are placed prior to installing the nails. Contingency plans should be developed to handle these potential problems prior to the start of the project. For estimating purposes, we recommend a design soil unit weight of approximately 125 pcf and friction angle of 30 degrees for the upper 10 ft of surficial soil. For the lower, very dense sand, we recommend a design unit weight of approximately 130 pcf and friction angle of 36 degrees. The table below summarizes the recommended design values. Factors of safety should be applied as appropriate to account for variability in the soil deposits. RECOMMENDED SOIL NAIL DESIGN VALUES Parameter Upper Variable Lower Very Sand Dense Sand Unit Weight (pct) 125 130 Friction Angle (degrees) 30 36 Ultimate Bond Stress (psi) 3.5 15 06/16/98 1:\P ROJ ECIR 193\013.2MH I G H L.1N E. R PT 12 • � .. .. ... .. DRAFT At least three different methods are presently being utilized in the design of soil nailing. All of the designs are based on limit state equilibrium analysis using assumptions of the soil strength that need to be field- verified by testing a percentage of the nails. The actual shear capacity available between the reinforcement, grout, and soil are important design parameters that can vary with the method of installation. Therefore if soil nailing is provided as an option, the contract documents should address the performance of the soil - nailed wall so that its design and installation is solely the responsibility of the contractor. The design should use an approved limit state analysis that demonstrates: 1) no failure surface exists through or outside the reinforced zone with a factor of safety less than 1.5 against sliding; 2) the working stress of the steel reinforcement bar does not exceed 80 percent of the yield stress; and 3) the mobilized soil strength is less than half the maximum available adhesion between the grout and soil as determined by the soil shear strength parameters. We recommend that the design of the soil nail wall system be field- verified by testing a minimum of three nails to 200 percent of the design load. The verification nails should be installed and tested relatively early during the excavation sequence but should be located at a minimum depth of 12 ft and also be below the zone of surficial disturbed soils. The verification nails should not be incorporated into the wall system after testing. Based on the results of the verification tests, modifications to the soil nail system design may be implemented as necessary to efficiently utilize the soil's inherent strength while still maintaining appropriate factors of safety. We also recommend that a minimum of 5 percent of the production nails be proof- tested to 150 percent of the design load as an aid in documenting the performance of the soil nail wall system and to identify changes of installation conditions in soil. Soil nail testing should be in accordance with the recommendations outlined in Appendix C of this report. Typically, drainage measures are incorporated into the wall face to drain the soil and ensure that hydrostatic pressures do not develop. However, for the expected soil conditions, drainage measures will likely not be required. 4.4 FOUNDATION SUPPORT The foundation soil for the reservoir is expected to consist of very dense sand and, in an undisturbed condition, will provide very good foundation soil for the reservoir. Because the sand contains little binder material, the foundation soil can become easily disturbed during routine construction activities. If the foundation soil becomes disturbed, it will be necessary to recompact the soil to at least 95 percent of the maximum dry density as determined by the ASTM D1557 test procedure. To prevent disturbance of the 06/16/98 1:\P ROJ ECr\ 193 \0 l 3.20\H l G H LIN E. RPT 13 DRAFT : ..�. foundation soil, we recommend placing a minimum 12 -inch thick layer of crushed rock, compacted to at least 95 percent of the ASTM D1557 maximum dry density, over the entire foundation footprint to provide a level working surface.that will be more resistant to disturbance by construction activities. Crushed rock should meet the requirements for base course in Section 9- 03.9(3) of the 1998 Standard Specifications for Road, Bridge and Municipal Construction prepared by the Washington State Department of Transportation (WSDOT) and American Public Works Association (APWA). Immediately prior to placing a working surface or pouring the foundation for the tank, the foundation should be observed by a qualified geotechnical engineer to confirm that the foundation surface is properly prepared. For the reservoir foundation prepared as described in the previous paragraphs, we recommend a maximum allowable soil bearing pressure of 7,000 pounds per square foot (psf) be used for design of isolated or continuous footings at least 24 inches in width. The maximum allowable bearing pressure may be increased by one -third for transient loads such as from wind or seismic loadings. We recommend that the footings be at least 18 inches below the lowest adjacent finished grade. 4.5 FLOOR SLAB SUPPORT It is anticipated that the reservoir floor will be constructed as slab -on- grade. If properly prepared and maintained, the expected soil at the floor slab level will provide suitable support. To provide uniform support for the slab -on -grade floor, we recommend the exposed subgrade be prepared by recompacting the surface to at least 95 percent of the maximum dry density (ASTM D1557). The slab subgrade should be checked by a qualified geotechnical engineer. Any loose, disturbed, or softened material should be removed and replaced with compacted crushed rock meeting the requirements for Base Course in Section 9- 03.9(3) of the 1998 WSDOT /APWA Standard Specifications. 4.6 ESTIMATED SETTLEMENTS We estimate that total settlements under the maximum allowable foundation loads will be on the order of 1 inch or less. The majority of the settlement will occur due to elastic compression of the underlying soil as the loads are applied during construction and filling of the reservoir. Differential settlements between the center and the outside of the reservoir floor slab are expected when water loads are applied to the entire bottom footprint of the reservoir. Differential settlements due to the differences in stresses between the outside and center of the foundation will be on the order of less than t/ inch. 06/t6/98 I: TROJECI ■193\013.20\HIGHLENE.RPT •�.� 14 DRAFT z ew QQ � JU • 00 0 w0 g' • •H w, z O-: •n u .0 w ui H H uj .0 =, O~ z For deflection analysis of slab -on -grade floors, a design value of 400 pci may be used for the coefficient of vertical subgrade reaction, k01, for a 1 -ft square plate. This coefficient of vertical subgrade reaction can be proportioned for the radius of the apparent loaded area by the expression: = [(B +1)/(2B)] 2 ko► where B is the radius of the apparent loaded area, in feet, which is a function of the thickness and flexural stiffness of the slab. The apparent radius of loaded area typically ranges from about 10 to 15 times the slab thickness. The value for the coefficient of vertical subgrade reaction is based on the assumption that subgrade preparation will be as recommended in this report. 4.7 BELOW -GRADE WALLS The groundwater table in the vicinity of the reservoir is well below the planned foundation level of the reservoir and the soil that underlies the site is relatively free - draining. Water infiltrating into the site soil is expected to infiltrate down past the reservoir. Provided that zone of free - draining material is adjacent to the below -grade walls of the reservoir, it is our opinion that installation of a foundation drainage system would not be necessary. With the exception of the upper 5 to 6 ft of native soil at the site, the remainder of the material excavated for the reservoir could be used as free - draining wall backfill material. If there is not enough material to backfill around the reservoir, or if the site soil becomes contaminated with fines during construction, then import material, meeting the requirements for Gravel Backfill for Walls in Section 9- 03.12(2) of the 1998 WSDOT /APWA Standard Specifications should be used for backfill. Backfill should be placed in relatively horizontal lifts of 12 inches or less, and compacted to between 90 to 92 percent of the maximum dry density. Hand - operated compaction equipment should be used within 5 ft of the wall. The upper 1 ft of backfill material should consist of relatively impermeable soil and should be sloped to direct runoff away from the reservoir. If a perimeter drain is desired, then it should be installed at the exterior base of the foundation and consist of 4 -inch diameter, heavy -duty, PVC plastic pipe placed with the perforations down. The drain should be surrounded by at least 6 inches of gravel meeting the requirements for Gravel Backfill for Drains in Section 9- 03.12(4) of the 1998 WSDOT /APWA Standard Specifications, and encased in a non -woven geotextile drainage fabric such as specified in Table 1 for low survivability and Class A in Table 2 in Section 9 -33 of the 1998 WSDOT /APWA Standard Specifications. The drain should discharge by tightline to the storm drainage system. 06/16/98 I :\P ROJ E C11193\013.20W IG H LIN E. R PT 15 DRAFT z • • . �z re g; • I to UO ,U)w J = H WO g -J cn a. H= z� z o.. w co; .0 H, LI W. t- : u Z Uco O ~. Z 1 against undisturbed natural soil or acting against properly compacted structural fill. The upper 1 ft of passive resistance should be neglected in design. The value for the coefficient of sliding resistance does not include a factor of safety. The allowable passive resistance has been reduced by a factor of 2.0 to limit deflections to less than 1 percent of the embedded depth. We do not recommend increasing the coefficient of friction to resist seismic or wind loads. Dynamic lateral loads will be resisted by dynamic passive earth pressure. An ultimate dynamic passive resistance of 485 pcf should be used in place of the static passive pressure given above, and applied as an equivalent fluid density on the below -grade portion of the wall or footing. The dynamic passive pressure assumes a horizontal surface of at least twice the depth of embedment in the direction of movement and no groundwater. We recommend neglecting the upper 1 foot of dynamic passive resistance is computing the available resistance under dynamic conditions. No factor of safety is included in the above dynamic passive earth pressures. In order to mobilize the ultimate dynamic passive resistance, lateral displacements on the order of 5 to 10 percent of the embedment depth must occur. Because such deformations are usually not acceptable for most structures, it is common practice to reduce the ultimate value depending on the amount of tolerable deformation. The table below summarizes wall displacements, in terms of percent of the embedded wall height, required for mobilization of passive resistance. PASSIVE RESISTANCE vs. WALL DEFLECTION Wall Displacement Percent of Ultimate (percent of emhedment) Passive Resistance . >5 100 5 90 2 75 1 50 0 t 1 30 06/16/98 I:1PRO1 EC11I93W013.20U-IIGHLINE.RPT 17 DRAFT « • z • ,H w D: J 0. U0: 'co N w; w= • N • w 0: :CO =•d:` 1- w, Z. z�;. O 'ZI- w 10 N .w W'. U. ,w H: maZ 0 N— . 0 •z 4.10 INFILTRATION Though in situ infiltration testing of the site soil was not part of our scope of services, the infiltration rate of the native site soil was estimated based on visual classification, results of grain size analyses, and past experience with similar soil types. For design of an infiltration system at the site, the upper 5 ft of soil, in our opinion, would be considered a fine sand and/or loamy sand per the 1994 King County Surface Water Design Manual (KCSWDM) classifications. The maximum design infiltration rate of a fine sand/loamy sand, per the KCSWDM, would be 2.4 inches per hour (0.04 in /min). Below a depth of about 5 ft, the site soil would be considered a medium sand, and the maximum design infiltration rate for a medium sand, per the KCSWDM, would be 8.0 inches per hour (0.13 in/min). In our opinion, the above values would be suitable for design of an infiltration system at the site. 4.11 INTERCONNECTING PIPING The following sections provide recommendations for design and construction of the interconnecting piping for the reservoir. 4.11.1 TRENCH EXCAVATION It is anticipated that excavation for the interconnecting piping will be in medium dense to dense glacial advance outwash. A hydraulic excavator with sufficient reach should be able to excavate the trench to the required depths without difficulty. Trench excavation should be in accordance with the requirements of Section 7- 10.3(7) 1998 WSDOT /APWA Standard Specifications. Trenches deeper than 4 ft should be provided with adequate shoring, such as a trench box, or be properly sloped. The glacial advance outwash within the trench zone would be classified as Type B [Washington Administrative Code (WAC) 296 - 155 -650 through 296 -155 - 66411]. If groundwater is present, the soil within the trench zone would be classified as Type C. The soil on the trench walls will be prone to sloughing and raveling as the exposed soil dries. In addition, the soil on the trench walls is highly erodible. The contractor should consider the erodibility and potential for sloughing and raveling in the design of trench support systems. Surcharge loads on trench support systems due to construction equipment, stockpiled material, and vehicle traffic should be included in the design of any anticipated shoring system. Actual trench configurations should be the responsibility of the contractor. All applicable local, state, and federal safety codes should be followed. All open cuts should be monitored during excavation for any evidence of instability. If instability is detected, the contractor should flatten the side slopes or install temporary shoring. 06/16/98 I:\PROJ ECI\ 193\01 3.20\HIGH LIN E. R PT 18 . DRAFT 4.11.2 PIPE FOUNDATION SUPPORT Foundation soil at expected pipe invert depths is expected to consist of glacial advance outwash and should provide adequate foundation support for the pipe, provided the trench bottom remains in a relatively undisturbed and dewatered condition. In the presence of water and/or foot traffic, the trench bottom can become disturbed, and in a disturbed condition, will generally provide poor foundation support. If the trench bottom becomes disturbed during excavation, and the bottom of the trench is maintained in a dry condition, the disturbance may be repaired by recompacting the subgrade. If the disturbed material becomes wet and is subject to construction traffic, it may become loose and unstable, and compaction of wet material will be difficult without drying of the soil. Wet and disturbed soil should be overexcavated to expose the underlying undisturbed soil and the overexcavation backfilled with suitable foundation material to provide a firm trench bottom. Foundation material should meet the requirements for Class A or B Foundation Material in Section 9 -03.17 of the 1998 WSDOT /APWA Standard Specifications. Foundation backfill material should be thoroughly compacted to provide a firm trench bottom. 4.11.3 PIPE BEDDING AND BACKFILL At the time this report was prepared, the pipe types and diameters for the interconnecting piping are unknown. Therefore, recommendations are provided for both flexible and rigid pipe. To provide uniform foundation support, pipes with diameters less than 30 inches should be underlain by at least 4 inches of bedding material. The thickness of bedding material should be increased to 6 inches for pipes with diameters greater than 30 inches. Bedding material for rigid pipes should conform to the requirements of Section 9 -03.15 of the 1998 WSDOT /APWA Standard Specifications, and bedding material for flexible pipes should conform to the requirements of Section 9 -03.16 of the 1998 WSDOT /APWA Standard Specifications. After placement of the pipe, the initial backfill in the pipe zone for flexible pipes should consist of the same bedding material placed to a height of at least 6 inches over the crown of the pipe. For rigid pipes, the initial backfill should extend above the pipe invert at least to a height of 0.15 ft times the pipe diameter (in inches). The initial backfill should be brought up evenly around the pipe in relatively horizontal lifts not exceeding 6 inches, and worked under the haunches of the pipe with a shovel, vibration, or other approved procedures. Bedding and initial backfill should be compacted in accordance with Section 7- 10.3(9) of the 1998 WSDOT /APWA Standard Specifications The excavated material from the trench is expected to consist of moist sand with varying amounts of gravel, and can be reused as trench backfill if the material is properly moisture - conditioned and compacted to the required density. Natural moisture contents of the soil samples from the explorations were generally in the 06/16/98 1:1PROi EC111 9 310 1 3.20W 1G HLINE. RPT 19 DRAFT -. range of 3 to 10 percent, which is near to below the typical range of optimum moisture contents for these soil types. Therefore, some wetting of the excavated material may be required to achieve 95 percent compaction. If the excavated trench material cannot be reused, import trench backfill should consist of material meeting the requirements for Bank Run Gravel for Trench Backfill in Section 9 -03.19 of the 1998 WSDOT /APWA Standard Specifications. If wet weather construction is anticipated, then the amount of fines (material passing an U.S. No. 200 sieve) should be limited to 5 percent or less of the material passing a 34 -inch sieve. If heavy compaction equipment is to be used to compact the trench backfill, then the first lift of backfill above the initial backfill for flexible pipes should not be compacted until the backfill has been placed to a height of 18 inches above the crown of the pipe. Subsequent Lifts should be placed in relatively horizontal lifts not exceeding 8 inches loose thickness. Trench backfill should be compacted to a relative density of at least 95 percent of the maximum dry density as specified in Section 2- 03.3(14)D of the 1998 WSDOT /APWA Standard Specifications (or ASTM D1557). 4.11.4 LOADS ON PIPES The soil load that will be imposed on a buried pipe is dependent on soil and groundwater conditions, the type of pipe, the width of the trench, height of bedding material around the pipe, the depth of cover over the pipe, the method of pipe placement, and backfill conditions. The parameters in the following table should be used in estimating soil loads on pipes in conjunction with the Marston load theory. PARAMETERS FOR ESTIMATING SOIL LOADS ON PIPES Parameter Recommended Value* Moist backfill unit weight (pct) 125 Rankine's active earth pressure coefficient 0.26 Coefficient of internal friction of backfill material 0.73 Coefficient of internal friction between backfill material 0.53 and sides of trench (no trench shoring left in place) Settlement ratio for positive projecting pipes (embankment condition): rigid pipe ordinary foundation 0.7 ridge pipe yielding foundation 0.3 flexible pipe 0.5 Settlement ratio for negative projecting pipes 0.0 (trench condition) * Values in the above table assume minimum of 95 percent compaction of the backfill over the pipe 06/16/98 I :\PROD ECTU 93 \0 13.20\1-1IG H LIN E. R PT 20 DRAFT z • UO N 0. ' vow w =; CO LL w 1 D z�..' I- O' • z uji U � O N;. :0 i--. •=w z U�. O z Consideration must also be given to the effect of traffic loading on the pipe in these areas. Figure 7 presents the additional traffic load that should be added to the soil load on the pipe due to H -20 AASHTO truck loading. Trench depths are expected to be generally in the 5 to 10 ft depth range, and trench widths are expected to be generally less than three pipe diameters. Therefore, the soil type on the trench wall will generally control the modulus of soil reaction (E'). Assuming good compaction of side fills around the pipe, an E value of 1,500 pounds per square inch (psi) should be used to compute deflections of pipe from vertical loads in accordance with the Iowa Formula. 5.0 DOCUMENT REVIEW AND CONSTRUCTION OBSERVATIONS We recommend that a qualified geotechnical or civil engineer review those portions of the plans and specifications that pertain to earthwork construction to determine if they are consistent with the recommendations presented in this report. We also recommend that monitoring, testing, and consultation be provided during construction to confirm that the conditions encountered are consistent with those indicated by our explorations, to provide expedient recommendations should conditions be revealed during construction that differ from those anticipated, and to evaluate whether geotechnical - related activities comply with project plans and specifications, and the recommendations contained in this report. Landau Associates would be pleased to provide these services. 6.0 USE OF THIS REPORT This report was prepared for the exclusive use of Parametrix, Inc. and the Highline Water District for specific application to this project. Use by others is at their sole risk. The findings, conclusions, recommendations, and opinions presented herein are based on field explorations and observations made during our study. Within the limitations of scope, schedule, and budget, the analyses, conclusions, and recommendations presented in this report were prepared in accordance with generally accepted professional geotechnical engineering principles and practices in this area at the time this report was prepared. We make no other warranty, either express or implied. 06/16/98 I :\ PROJECT, I 93V013.20\HLGHLtNE.RPT 21 DRAFT z 4z z. 1- W. J U. U OQ: w CO ILI LLI u1 O, LL a. d' �ui _. Z t-- O. Z H: UJ co, 0 H -. WW --U II Cc W Z; O We appreciate the opportunity to provide these services and look forward to assisting you in the future. Please contact the undersigned if you have any questions regarding the information contained in this report. LANDAU ASSOCIATES, INC. By: Edward J. Heavey, P.E. Senior Engineer and Dennis R. Stettler, P.E. Principal 06116/98 I: \PROJEC11193 \013.20WIGHLINE.RPT 22 DRAFT 7.0 REFERENCES AASHTO. 1996. Standard Specifications for Highway Bridges. American Association of State Highway and Transportation Officials, Inc. Sixteenth Edition, 1996. American Society of Civil Engineers (ASCE). 1996. Minimum Design Loads for Buildings and Other Structures. ASCE Standard 7 -95. Applied Technology Council. 1981. ATC 6 Seismic Design Guidellines for Highway Bridges. Buchanan - Banks, J.M. and Collins, D.S. 1994. Map Showing Depth to Bedrock of the Tacoma and Part of the Centralia 30' X 60' Quadrangles, Washington. Miscellaneous Field Studies Map MF -2265, Published by the U.S. Geological Survey. 1994. Galster R.W. and LaPrade, W.T. 1991. Geology of Seattle, Washington, United States of America, Bulletin of the Association of Engineering Geologist. Vol. XXVIII, No. 3. pp. 239 -302 , 1 plate. International Conference of Building Officials. 1997. 1997 Uniform Building Code, Vohune 2 Structural Engineering Provisions. 1997. Newmark, N.M. and Hall, W.J. 1982. Earthquake Spectra and Design. Earthquake Engineering Research Institute. Waldron, H.H. 1962. Geology of the Des Moines Quadrangle, Washington. Map GC -159. Published by the U.S. Geological Survey. 1962 WSDOT. 1996. Bridge Design Manual. M 23 -50, through revision 197. Washington State Department of Transportation, Program Development Division, Bridge and Structures, Olympia, WA. 06/16/98 1:'PROJ EC(1193\013.20U-I IG H LINE. RPT 23 DRAFT . •z • 1:4 UO. • co 11J• • ,w= • SQ LL Oi • U a g z i-O z F- � 1=' w 'u- O:. Z`. • z 193013.20 Parametric / Highline Reservoir / Report / FigI (M) 4/99 ravamwimIITM1141. NItalEIENFIlimIll,111011/1•Miapoill■So s■IIIAIIIIIIIVAII/1/41WlixIII■ 111 r lagial r. z 5 . • z , ime6,- 1 . .. I Pli /ini■-`14 ' ri,, a s r 13•5111 • gr. • ST -4 16 0 * , „9 , '111IVI, 4". . ... . ,.._.- e4,11:ISTTN N..........._:q4„._ ... -'e.: araf —.- VTOS .A4 .. \ C k:s ....11 %.1 Wet ‘,1 l El°MET • 6 caru ' . . L 1.:.:, ilE II I p., 4:!: . • :.I arareanNE 'll' . e Z te.... iiiiila UMW I S" i L/I 27" 144 A 44 .... iglit i srell A . 144TH - ST .. 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F- 0 Z k-' wW .2D • • = W'" 0' • 0 z rt / Fig4 (M) . 5/9 rametrix / Highli VELOCITY (In. /sec) 200 100 80 60 40 20 10 8 6 4 2 .8 .4 .2 .04 .06 D8 .1 .2 .4 .6 .8 1 2 4 6 8 10 PERIOD (secs) Peak Horizontal Ground Acceleration, a = 0.33g Critical Damping = 0%, 2%, 5%, 10% 20 200 100 80 60 40 20 10 a 6 4 2 .8 .6 .4 .2 Site Reponse Spectra Figure 4 4 1WitrIARMWt NI • , (GD 'Coo cP 'lit. 1 I AO ANT., - - 00 A L.Nr4 1P= % " agi . j I 1 °••4) Aa4 *AL, "4 ire Adt... 111421/A .41 Ah. I V km. bN r‘A ''‘..9 s• 6' 0 \ e ' & vcb to Ad 11111114L/ 1W IVn I KI1l11 yl o V oAo e r 1 1 W q 1)211b11■." ..4M.A21I m. . e • e, 4 • A A iNv/v , A lcy 2/0 1M ■ M IWO. \ I \ ' \ t 1 \ 44rIalli'N. • Jr IOlNi .ti I, NII. i i fiA l i 741Vq1111C■111=■., Re 0 ,T '''V". i s I. i \ l 1 ik ttA Apr 4 .kt■ . .v....*:. • IArkol. tb, min .,•,, L . 5 62„ , 2 .." v a EIMIEMINEF2WAINNIEIL IN I IMMI17.1712 0 a / t.. 1 ArAIPMEIMII% NNW , , , z > 4k. -. 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Az • ; Or • . - • • , , .. \ - \-•"*■1 . . . ...,,„ ..._, . „„. ..I .'7\ - .,! .. ..7, ... ; _ .04 .06 D8 .1 .2 .4 .6 .8 1 2 4 6 8 10 PERIOD (secs) Peak Horizontal Ground Acceleration, a = 0.33g Critical Damping = 0%, 2%, 5%, 10% 20 200 100 80 60 40 20 10 a 6 4 2 .8 .6 .4 .2 Site Reponse Spectra Figure 4 4 1WitrIARMWt 8 In g r 0 E 0 0 a 0 0 H —Pile —2' UPPER TWO Ft OF PASSIVE RESISTANCE SHOULD BE NEGLECTED. 350pcf 1� / / / / / / / / / / // / / / // 0.2H 18Hpsf UNGROUTED PORTION OF TIEBACK / ANCHOR / H/4 60° J I.I.I 11.111111.111111 I.I I I MIII'II'II'II1'IIIII'I'III'II gn[I.tl.p17[IgI.�ry17'II I.;II1111[IP' • NO LOAD ZONE GROUTED PORTION OF TIEBACK ANCHOR 27pcf PASSIVE ACTIVE NOTES: 1. LATERAL EARTH PRESSURE ABOVE THE BASE OF THE EXCAVATION ACTS OVER ONE PILE SPACING. 2. ACTIVE EARTH PRESSURE BELOW THE BASE OF THE EXCAVATION ACTS OVER ONE PILE DIAMETER. 3. PASSIVE RESISTANCE ACTS OVER TWO PILE DIAMETERS OR ONE PILE SPACING, WHICHEVER IS LESS. 4. NOT FOR CONSTRUCTION. 5. NO SCALE Fir Typical Solider Pile Tieback Anchor Wall Figure 5 6tki474 fElia!(afa> ' rr'4zrr�.� aw,Glrfriw.ft;7u. Z • • H'Li! r4 2: J U -. UO � .UU u� w, .w= w O. • u.:4(' co = Ci; w, • r • Z� F- O z ww Dp • ww" ,O> w ,n' z m to N t7 O as z g en n 0 t E 0 0 a O N M O 01 Excavation Sequence / Level 1 Cast—in--Place Reinforced Concrete Finish Face Level 2 Level 3 Soil To Be Removed — Existing Ground Surface Temporary Shotcrete Facing / / Level n . / Notes: Not for construction SECTION (Not to Scale) Permanent Soil Nail (Typ.) 1 Typical Soil Nail Wall Figure 6 •-; sr�. i:`: i.;,'} ��SS ':Y:ti:.::si1;.,;'."..�'r�C.� fir;{: ^•� %(n1:�'7'+:'h+:.t.l.?:t�6`yk wMawsMit� sG..�,.shisa;�f'!�yd'+ailf�: fail+ k+ �.'? �37�: i3�txr��: fi.. 3; 47G�rT.�'�ri4.#ilirK..�A ✓.:ktk: Kafin,:t+�:t Z W. 6 U O' co W: J = I.- CO u.; J, = d; _; 1- 0; Z I, ILI al D Cr O cy w w ui Z U co' rz O ~; Z Depth of Cover (ft F11 1 0 5 10 15 20 H -20 Loading H -20 Truck Loading Depth of Cover 0 0 0.2 0.4 0 6 0.8 Vertical Pressure at Top of Pipe (Kips /ft2) Notes: 1. For traffic Toads multiply curve value by pipe O.D. in feet. 2. Curve is corrected for the following: Depth Impact Factor 0 -1 1.50 1 -2 1.35 2 -3 1.15 > 4 1.0 3. Backfill loads must be added to traffic load. 1.0 12 Traffic Loads on Pipes 1 Figure 7 °• .= ;.: i 9,Ybas: 4 tih�a 5 �i; lsia R{E}' Rt 'NN#'41;'F . ?:Gy/. ;Q,4'.5ittea. NY'i,'1tyJ,pwf #n4'4i!�f.L it1�`i F,Itorg,"'� ?�y ''S ,5 -.l, ,r F" .`+Ai. 1S Z ~W re JU 00 U 0. J= I-- U) LL w0 �a co =a I- w Z = �- 0 Z W U 0- GI ww I- I-- u'O w .Z = 0 Z APPENDIX A FIELD EXPLORATIONS Subsurface conditions at the site of the proposed reservoir were explored on December 2 and 3, 1997 by completing four borings, B -1 through B -4, to depths of about 60 and 80 ft below the existing ground surface. Subsurface conditions along the proposed route of the outlet pipeline were explored by completing 3 borings, B -5 through B -7, to depths of about 161/2 ft below the existing ground surface. The borings were drilled by Holt Drilling, Inc., of Puyallup, Washington (under subcontract to Landau Associates) using a truck - mounted drill rig advancing hollow -stem augers. Field logging of subsurface conditions observed in the borings was carried out by a geologist from Landau Associates, who continuously observed the explorations, coordinated the field work, obtained representative soil samples, and prepared summary logs of the conditions encountered. Soil samples were obtained from the borings at 21/2 and 5 ft depth intervals using a 2 -inch, outside diameter (O.D.), split -spoon sampler and the Standard Penetration Test (SPT) procedure (ASTM D1 586). The split -spoon sampler was driven 18 inches (or a portion thereof) using a 140 -pound hammer on a wireline with a manual release, falling from a height of 30 inches. The number of blows required to drive the sample for each 6 -inch interval of the 18 -inch drive (or portion thereof) was recorded on the field logs. The number of blows to drive the sampler the last 12 inches (or portion thereof) of the 18 -inch drive is termed the Standard Penetration Resistance and is shown on the summary logs in this appendix. The Standard Penetration Resistance provides a measure of the in situ density of cohesionless soil and consistency of cohesive soil. The borings were backfilled to the surface with a mixture of cuttings from the boring and bentonite chips. The approximate locations of the borings are shown on Figures 2 and 3. Boring locations were determined in the field by measuring from existing site features. Ground surface elevations at the boring locations were estimated from the topographic contours shown on Figure 2. All soil encountered in the explorations was described using the Soil Classification System presented on Figure A -1, and in general accordance with ASTM D2488 Standard Recommended Practice for Description of Soil (Visual - Manual Procedures). The subsurface conditions are described in summary boring logs on Figures A -2 through A -8. Information presented on the summary logs depicts subsurface conditions only at the specified location and at the date designated on the log. Soil and water conditions at other locations may differ and changes may also result with the passage of time. 06/16/98 1:\P ROJ ECin193\013.20NH IG H LIN E. R PT A -1 �": ,.:i: �4!'sa:- .�y�.: ±:5'tt�ti ,;:": =.' i''i::w:ir ,l•'7.i,?:? 'ka.'6f`w°.�t.:i}fidEtY +'i�evy u5;�;d„iiZ ?ts1; :N: ��+'. .'fie:. ; " i' -'111:1;m, - $47 wz i DRAFT :i'f.A Arat ':7E ?.AIikXK'kk : •taiCu4' 'F,t.'1S 44,4, z ILL • IX N: .u6 n' • .0 O co 0: ' rnw J H • Cn w O' J' LL j. - d. •H =. • Z I— 0: z I—; D0: Oco: 01- =U LL. H. ..z, OH z SAMPLE DISPOSAL Soil samples obtained from the explorations will be stored in our laboratory for 30 days after the date of our final report. After that date, the samples will be disposed of unless arrangements are made to retain them. 06/16/98 I:\PROJ EC11 I93V013.20W IGHLINE. RPT A -2 DRAFT J;:s, ^•.,, .�,. : ism+. xs: rflt�&&° f, �Yn. S�ec�.xCB ±x>�tn,:i�c�.4r,'r!.�' m*n"ti..".r` ligt ,f'Fhr',- `aiiti,'�'rA�.'t;G.,.r t:':.l:` S�Srr�.,a'si'.<4:- .::vr�ad:�n {cw t.�;a ;.;M�w < >::+�'. 193013.10 Psrsmslll■ /Mighlins N: \197013 \10 \Borings \FigA•1 IM 0/90 MAJOR DIVISIONS Soil Classification System USCS GRAPHIC LETTER SYMBOL SYMBOL (1) TYPICAL (2X3) DESCRIPTIONS COARSE — GRAINED SOIL .. (Mors than 502 of moleried is Iorger than No.2OO sure size) GRAVEL AND GRAVELLY SOIL (More than 50% of coarse froction retoined No.4 sieve) CLEAN GRAVEL (Little a no fees) 000 0 00' o,00� GW GP GM GC Well — graded gravel; gravel /sand mixture(s); little or no fines Poorly graded grovel; grovel/sand mixture(s); little or no fines Silty grovel; gravel/sand /silt mixture(s) Clayey grovel; grovel /sand /day mixture(s) • •000 00o GRAVEL WITH FINES (Appreciable amount of fines) • , • • . _'....•i! 00 • 0 . ' SAND AND SANDY SOIL (More than 50% of coarse fraction Passed through No.4 sue) CLEAN SAND (Little or no fines) SW SP SM SC Well - graded sand; gravelly sand; little or no fines Poorly groded sand; gravelly sand; little or no fines Silty sand; sand /silt mixture(s) Clayey sand; sond /cloy mixture(s) SAND WITH FINES (Appreciable amount of fines) r .e 'g 15 I g E c 15 W d = m • yy SILT AND CLAY (Liquid Limit Tess thon 50) ' �' ML CL O L Inorganic silt and very fine sand; rock flour; silty or clayey fine sand or clayey silt with slight plasticity Inorganic cloy of low to medium plasticity; gravelly clay; sandy clay, silty day, lean cloy Oranic sit; organic, silty day of low plasticity SILT AND CLAY ( Liquid limit greater than 50) iiiiiiii �/ /� - - MH CH OH Inorganic silt; micaceous or diatomaceous fine Bond or silty soil Inorganic cloy of high plasticity, tat cloy Organic clay of medium to high plasticity, organic silt HIGHLY ORGANIC SOIL Ivy PT Peat; humus; swamp soil with high organic content OTHER 'y, / AC/PC m Asphalt Concrete Pavement/Portland Cement Paveent Notes 1. USCS letter symbds correspond to the symbds used by the Unified Soil Oossificotion System and ASTM t2assificotan methods. Dud letter symbds (e.¢. SM -SP) for a send or grovel indicate a soil with on estimated 5 -15% fins. Multiple letter symbols (e.g.,ML /CL) indicate borderline or multiple soil dossificotans. 2. Soil dossificotions are based on the generd approoch presented in the Standard Practice for Description and Identification of Soils (Visual -Manuel Procedure!. os outlined in ASTM D2488. 1eiere loborotory index testing has been conducted, soil dossificotans ore based on the Standard Test Method for Classification of Soils for Engineering Purposes. as outlined in ASTM 02487. 3. Sol description terminology is bused on visual estimates (in the absence of laboratory test dato) of the percentages of each sot type and is defined os follows Primary Constituent: >50% - 'GRAVEL,' *SAND; SILT,• 'CLAY; etc. Secondary Constituents >30% and S50% - 'very gravelly; 'very sandy,' 'very silty; etc. >152 and 130% - 'gravelly,' *sandy; 'silly,' etc. Additional Constituents: >52 and 115% - 'with grovel; with sand,' 'with sit; etc. 55% - ' troce grovel; 'trace sonde ' trace silt; etc, or not noted. SAMPLE NUMBER & INTERVAL r Recovery Depth Interval Sample 111 Identification ]le--Somple Depth Interval Number Portion of Somple Retoined for Archive or Analysis TEST DATA 173 Code G Description Grain Size Analyes Key SAMPLER TYPE Code a b c d e 1 2 3 4 Description 3.25 -inch 0.0., 2.42 -inch I.O. Split Spoon Sompler 2.00 -inch 0.0., 1.50 -inch 1.0. Split Spoon Sompler Shelby Tube Grob Somple 3.00 -inch I.D. Core Barrel Sampler 300-lb Hammer. 30 -inch Drop 140-lb Hammer, 30 -inch Drop Pushed 350 -Ib. Hammer. 30 -inch Drop OTHER Q. Approximate Water Elevation At Time of Drilling (ATD) ATD or On Dote Noted %,, { B -1 SAMPLE DATA SOIL PROFILE s 0 LL 0 0 z a. Sampler Type Blows /Foot _ C N 00 iU Graphic Symbol • S -1 IC - S -2 JJ 10 S -3 S -4 1E — 20 S -5 10 S -6 _1_1.. — 30 S -7 IE S -8 1P — 40 • S -9 ic 1_ S-10 10 50 S -11 S -12JJ — 60 No b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 tes: 28 26 78 50 6" 50 6" 50 5" 50 6" 50 5" 50 6" 50 6" 97 50 6" 1. Sir tex 2. Ref 10, G 8 7, G 6 12 8, G 13 8, G 7 7 7, G 8 • 0 (n N U to SP trW Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation Ift): 480 ft. Brown. gravelly, fine to medium SAND interbedded with silty sand and fine gravel with brown to orange stained areas (medium dense. moist) (Glacial Advance Outwash) SP. Brown, line to medium SAND with trace silt and coarse sand (medium dense to very dense, damp) (Glacial Advance Outwash) SP Brown. fine to coarse SAND with trace silt and gravel (very dense, damp) (Glacial Advance Outwash) atigraphl I for an er to "S SP Brown, line to medium SAND with trace silt and trace gravel (very dense. moist) (Glacial Advance Outwash) c cont expla oil CI SP acts a nation assific Brown, fine to medium SAND with trace silt (very dense, moist) (Glacial Advance Outwash) (Continued Next Pagel re based on field interpretations and are approximate. Ref of subsurface conditions. ation System and Key" figure for explanation of graphics an er 10 the d symbols. Boring B -1 Figure A -2 (1 of 2) Z Z' re W QQ2: J 0' N f• :), N W' W I: w W 0 2 J u- <. cn a II. W:. Z� 0: W~ U • �. o I- W U• J` I- LL. 0 WZ U N' 0 H O z • B -1 SAMPLE DATA SOIL PROFILE S -13 0 n f- o. E 0 u. N 0 in 0 -- C � C iU .0 rnE r .0 T 0) 0) U rn Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation (ft): 480 ft. S -14 r0 — 70 0 0 O z a 0 0 S -15 S -16 — 80 — 90 L 100 110 — 120 SP (continued) Brown. line to medium SAND with trace silt (very dense. moist) (Glacial Advance Outwash) Boring Completed 12/02/97 No Groundwater Encountered Total Depth : 79.5 ft. Notes: 1. StratigraphiC contacts are based on field interpretations and are approximate. Refer to the text for an explanation of subsurface conditions. 2. Refer to -Soil Classification System and Key- figure for explanation of graphics and symbols. Boring B -1 Figure A -2 (2 of 2) z • ~ Z ne U .0 0; U) 0 U) W ; W=• J fr— i U) LL' .WO}-• J' s W. z I— O; z 1— D0 ... • O -i 0 ,W Wt U, O: • 1j z O z • B -2 SAMPLE DATA SOIL PROFILE Sampler Type • 0 O LL 0 41 • O m a) O c iU Graphic Symbol USCS Symbol Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation III): 474 ft. S -1 AP S-2 10 - S -3 10 —20 4 S -5 —3o-6� S-7'' _48:I) S -9 o` S -50101J L ? - S -12 0 -60 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 14 36 82 50 6" 50 4" 90 93 50 5" 50 5" 50 6" 89 50 5" 9 15 11, G 6 6 6. G 7 8 7 7 7 7, G SP- Dark brown organic soil (topsoil) Light brown. fine to medium SAND with gravel and trace silt (medium dense, moist) (Glacial Advance Outwash) SP Gray- brown, fine to medium SAND with trace silt and gravel, interbedded with brown fine sand with trace sill. iron staining (dense. moist) (Glacial Advance Outwash) SW Brown, gravelly fine to coarse SAND with trace silt Ivery dense. moist) (Glacial Advance Outwash) SP SW SP Brown, fine to medium SAND with trace silt (very dense, moist) (Glacial Advance Outwash) Brown, line to coarse SAND with gravel and `trace silt (very dense, moist) (Glacial Advance Outwash) Brown, fine to medium SAND with trace silt (very dense, moist) (Glacial Advance Outwash) tes: B N 1. Str tax 2. Ref oring C o Groun Total atigraphi t for an er to "S ompleted 12/03/97 dwater Encountered Depth : 60.0 ft. contacts are based on field interpretations and are approximate. Refer to the explanation of subsurface conditions. oil Classification System and Key" figure for explanation of graphics and symbols. Boring B -2 ...: D. Z •W • ft,Q 2 UO.. (0 0 W'. WI. co LL W O' g J; u. I— Z HO ZH.. 2 U� W .1- O' 111 Z W' Z • B -3 SAMPLE DATA SOIL PROFILE Sampler Type Blows /Foot o_ 0 m N C o S -1 J - S -2 - 10 S -3 10 _ - S -4 — 20 S -51] S -6 — 30 S -7 S -8 -- 40 S -9 a- o_ 0 o _ S -12 n -60 5 ei 0 0 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 30 7 87 77 84 50 6" 50 6" 50 5" 50 6" 50 5" 50 5" 50 6" 13. G 16 9 7, G 6 6 6 7 6 6 8. G 6 0 .0 E u) rn U N SW Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation (11): 469 ft. Dark medium brown, gravelly fine to coarse SAND with silt (dense to loose, moist) (Glacial Advance Outwash) SW Brown, fine to coarse SAND with gravel and trace silt (very dense. moist) (Glacial Advance Outwash) SP Brown, tine to medium SAND with trace silt (very dense. moist) (Glacial Advance Outwash) Become Fine No tes: 8 N 1. SIr tex 2. Ref oring C o Groun Total ompleted 12/02/97 dwater Encountered Depth : 59.5 ft. contacts are based on field interpretations and are approximate. Refer to the explanation of subsurface conditions. oil Classification System and Key" figure for explanation of graphics and symbols. atigraphi c t for an er to "S Boring B -3 Figure A -4 " ';.� B -4 SAMPLE DATA SOIL PROFILE —0 Sampler Type Blows /Foot Graphic Symbol USCS Symbol Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation (ft): 468 ft. 0 u. u. 0 0 0 E • 0 0 ♦i 0 e S -3 E S -4 ]] — 20 r S -5j. S -6 — 30 S-7 S -8 — 40 S -9 10 S -10 j — 50 S -11 S -12 60 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 b2 24 87 85 92 76 91 81 91 83 50 6" 50 5" 50 6" 8, G 6 6 6 6 6, G 6 8 7 7. G 7 SP \ Brown organic soil with sod (topsoil) Brown. line to medium SAND with gravel and trace silt (medium dense, moist) (Glacial Advance Outwash) SW sw SP Brown, fine to coarse SAND with gravel and trace silt and areas of organic -brown interbeds (very dense, moist) (Glacial Advance Outwash) Brown, line to coarse SAND and gravel with trace silt (very dense, moist) (Glacial Advance Outwash) Brown, fine to medium SAND with trace gravel, coarse sand, and silt (very dense, moist) (Glacial Advance Outwash) SP Brown, fine SAND occasionally with trace silt (very dense, moist) (Glacial Advance Outwash) No tes: 8 N 1. Str tex 2. Ref oring C o Groun Total atigraphi t for an er to -S ompleted 12/03/97 dwater Encountered Depth : 59.5 ft. contacts are based on field interpretations and are approximate. Ref explanation of subsurface conditions. oil Classification System and Key" figure for explanation of graphics an er to the d symbols. Boring B -4 Figure A -5 Z w` g: J0: 0 0 { W 0. , .ALL .WO • J LL - a. H=. • Z )r—: I— 0' • Z U: W (L'. • H -- LIIZ 0 z • di 0 0 3 0 B -6 SAMPLE DATA SOIL PROFILE —10 S -3 S -4 — 20 —30 — 40 -- 50 —60 0 F- o. E to b2 b2 b2 b2 0 u. 0 C-5 79 o f, iU 0 0. a r to U) 0 0) D Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation (f11: Not Measured �' ; VACn ASPHALT SW Dark brown. fine to coarse SAND with trace 8 gravel and silt (dense. moist( (Fill) 9. G 9 SW SP Brown. gravelly fine to coarse SAND with silt (loose. moist) (Glacial Advance Outwash) ■ Brown fine SAND with trace silt (very dense. moist( (Glacial Advance Outwash) Boring Completed 12/04/97 No Groundwater Encountered Total Depth : 16.5 ft. Notes: 1. Slratigraphic contacts are based on field interpretations and are approximate. Refer to the text for an explanation of subsurface conditions. 2. Refer to "Soil Classilication System and Key" figure for explanation of graphics and symbols. Boring 8 -6 Figure A -7 B -7 SAMPLE DATA SOIL PROFILE • —o 0 o. r E 0 rn 0 U. 0 0 .- u • o C o a. • 6. E r 0) 0) U N Drilling Method: 4" ID Hollow Stem Auger /SPT Ground Elevation (ft): Not Measured S -4 —20 — 30 40 — 50 • o_ n 0 • . 0 n • — 60 b2 78 3 9. G 10 6 %ACn ASPHALT SW Brown, fine to coarse SAND and gravel with trace silt (very dense, damp) (Glacial Advance Outwash) SP Brown, line to medium SAND with silt (dense, moist) (Glacial Advance Outwash) SP Interbedded brown, medium to fine SAND with trace gravel and silt and brown tine sand with trace silt (very dense, moist) (Glacial Advance Outwash) Boring Completed 12/04/97 No Groundwater Encountered Total Depth 16.5 ft. Notes: 1. Stratigraphic contacts are based on lield interpretations and are approximate. Refer to the text for an explanation of subsurface conditions. 2. Refer to -Soil Classification System and Key- figure for explanation of graphics and symbols. Boring B -7 Figure A -8 Z W QQ 2: n! _1 U O' to W: W = W0. g Nei H =: Zi- t— O'. Z I- 'CD I- • Iw LI Z; •U CO! Off'; Z w 6 0 00 co 0 J - H U WO =a �W Z �. I- O Z�- w • w U 0 O P- c) kt1 LJ U' W r- -- C) .. Z W 1- O z APPENDIX B LABORATORY TESTING Natural moisture content determinations and sieve analyses were conducted in Landau Associates' laboratory on representative samples recovered from the borings for the purpose of classification. Laboratory testing was performed in general accordance with the American Society of Testing and Materials (ASTM) standard test procedures, which are described below. The samples were checked against the field log descriptions, which were updated where appropriate in general accordance with ASTM D2487 Standard Test Method for Classification of Soils for Engineering Purposes. NATURAL MOISTURE CONTENT Natural moisture content determinations were performed on most soil samples recovered from the borings in accordance with ASTM D2216. The natural moisture contents are shown at the respective sample depths in the column labeled "Moisture Content" on the summary boring logs in Appendix A. GRAIN SIZE ANALYSIS Sieve analyses were performed on representative soil samples obtained from the borings in accordance with ASTM D422, to provide an indication of their grain size distribution. The results of the sieve analyses are shown on Figure B -1 through B -5 in this appendix. 06/16/98 1:\ PROJECI\193\013.2O\HIGHLINE.RPT B-1 DRAFT z = • • • W 6 U U O; CO wC0 W , H: W O' to = v: z Z 0,. IJJ uy W Z'. LIJ z m 0 t0 0� i 0 0 oc cn O 0 O 0 0 O O O O O O O 0 0 0 0 0 0 0 0 0 0 0 O 0) CO N CO to r') N 146iam (q Jauid }uaDJad T 0 U `0 in c 0 V) a v a) N 0 0 U > 0 O c N N L O O U N .o O U N 3 0 m Natural Moisture ( %) O O 7.0 O ap O cd Soil Description Gravelly, fine to coarse SAND with silt J Gravelly, fine to medium SAND with silt Fine to medium SAND Fine to medium SAND Unified Soil Classification SP /SM SP /SM u7 tr.) to si 0i 0i .-- N M th I I I O •-• O o6 N O ao rl Sample Number •• 17 CO 00 Exploration Number 1 1 1 1 m m m m N ICI � _ .._ �._._....... �_...,..... z _ 1- ~ W. JU UO i N0. 111 = J H: W O g J }r• N d uj Z 1- O: Z H, co I- CU W. U Z; LILA It O~ z ao ot co ti IIJ C O 0 Z 0 u Y 0 0 u 0 K 0 c v` 0 0 pi 0 0. o+ O 0 O O O 0 0 0 O 0 0 0 0 M 0 CO 0 CO In v3' 0 O }y6iaM Xq Jau!J }uapiiad 0 c O N C li E v a) 0 0) O a) 4) [A O O U In 4) O U N a) N -o 0 Natural Moisture ( %) O n O cO O O 6 Soil Description Fine to medium SAND with trace silt Fine to medium SAND with truce silt 1 Gravelly. fine to coarse SAND with trace silt Fine to medium SAND Unified Soil Classification dS dS 3 n. (r) V In in N Depth 53.0 - 73.0 - O O ri 00 r c.4 Sample Number r 15 M tO B -2 B -2 Explor Nurr CO CO N (NJ CO u) 4) T 0 C Q 4) N c 0 0 QI 0 C, 6 0 P") �s 0 O 0 0 0 O O O O 0 O O O 0 0 0 0 0 0 0 0 0 O Cr) CO N tO to v M N 1u6iaM i(g Jauid }ua3Jad Groin Size in Millimeters 0 U O U c 0 N E as tV N 0 O V 4, 0 m c El d O O U N 4) 0 0 U Natural Moisture ( %) L 7.0 J O O o Soil Description Fine to medium SAND Gravelly Fine to coarse SAND with silt Fine to medium SAND 1 C) Z Q N N c (t. Unified Soil Classification V) SW /SM (a/) N Depth (ft.) O ci coo 1 to ai ) u7 d 1 O M to — 1 O .-- u) N I O U Sample Number 11 Exploration Number N 1 CO t'7 1 m N) 1 CO r) I m iufl L::::a ....;_..:, co CP En 4 t_ co 5 c6 < 4) N U) C C C� : ' , z �W 6_ 0 0. W I: J � W O' u_ co = d. W ZF 0:. Z 0 W W` �0 0: • W Z F- Z Cg O tT n 0 0 0 0 0 0 O O O O 0 0 O O O O O O O O O O O 0 O 01 CO N CO tt) <t M N Tg6iaM Jauid }ua3Jad U) a E a a) N N c 0 6_ T a 0 0 v c 0 a) c E 3 )to 0 0 0 0 ) c i` to 0 0 0 m .0 0 0 N 0 Natural Moisture (7.) 0 0 0 L_ o'c Soil Description coarse SAND with gravel and trace silt 0 z ND AND N a) c L. Unified Soil Classification (3 (a/) N dS to 4 M in (0 .h I I O rM O N Sample Number N N 0 (V B -4 N )f� nl 1 1 1 m m CO iufl I m cn a) 0 c Q a) N 0 0 a) 0) a) ct a) c t cri 2 03 ..: u c c O_ 2 0 ri 0 0 NI ▪ 2 N ,=, — — a) 5; V) 0 cQi - o .n _ cf ▪ CO V) 0 0 0 O 0 0 O 0 O O O 0 0 rn m 0 0 N )°n °v 0 0 0 ° Tg6iaM Aq Jauid 11.193aad Groin Size in Millimeters 0 0 O v c 0 N E 7 v 0) co o O 0 0) 0 0) c 0) In 0` 0 0 N 0) .0 O 0 7 O z Moisture (%) CA 0 Q1 Soil Description y 0 z V) L. 0) N 0 0 0 0 0) 0 .. 0) L 0 Z In E 3 •v E 0 0) co iL c O o v v 0) C N C o U a V) t n 0 CD 0 tD 0 to N N c 0 r+ L1I o .n E x z W CO col m O I m N z •' APPENDIX C. Tieback Anchor and Soil Nail Testingand Acceptance •�` !�� Z FZ ccw JU 000 N W I �1.- w0 LQ a. =w Z �0 Z w • 0 U - O . O H w 0 LLO ..z w U= O~ z — APPENDIX C TIEBACK ANCHOR AND SOIL NAILING TESTING AND ACCEPTANCE TIEBACK ANCHOR TESTING AND ACCEPTANCE Tieback anchors to be tested should be installed using the same construction techniques as for production tieback anchors. Verification testing should be performed on at least one tieback anchor per tieback row to verify the Contractor's installation procedures and design assumptions, and all production anchors should be proof - tested to 130 percent of the design load to verify the structural components of each anchor. Load testing should be performed against either the soldier pile or the wailer installed between soldier piles. The test load is applied using a hydraulic jack and pump with actual loads monitored with a calibrated electric load cell or pressure gauge. A dial gauge or vernier scale capable of measuring to 0.001 inch of the ground anchor movement is also needed. The movement - measuring device should have a minimum travel equal to the theoretical elastic elongation of the total nail length plus 1 inch. The dial gauge or vernier should be monitored with a reference system that is independent of the jacking system and shoring wall. Tieback anchors subjected to the verification test should be loaded to 200 percent of the design load to verify that the pullout resistance has a minimum factor of safety of 2.0. The verification test may be performed on one of the production tiebacks. The tendons on the no -load portion of the anchor should be encased in PVC to prevent Toad transfer during the test. The 200 percent verification test should be conducted by cyclically and incrementally loading and unloading the anchor to a maximum load of 200 percent of the design load (DL) in accordance with the schedule presented in Table C -1. All production tiebacks should be proof- tested by applying at least 133 percent of the design Toad. The anchors should be loaded in accordance with the schedule presented in Table C -2. The alignment load (AL) shown in Tables C -1 and C -2 is the load necessary to take the slack out of the tieback system during initial tensioning (typically less than 100 psi). The tendon cross - sectional area should be proportioned such that the maximum stress during verification and production testing does not exceed 80 percent of the yield strength of the tendons. Intermediate loads during the 200 percent verification test and proof test should be held for a minimum of 5 minutes. The maximum load (2.00 x DL for the verification test and 1.33 x DL for the proof test) should be held for a minimum of 10 minutes and readings should be recorded at 1, 2, 3, 4, 5, 6, and 10 minutes. If the total creep movement of the tendons, between 1 and 10 minutes, exceeds 0.040 inches, then the test load should be maintained for an additional 50 minutes (60 minutes total), and the movement readings should be taken at 20, 30, 40, 50, and 60 minutes. During the load hold periods, the hydraulic pressure on the jack 06/16/98 1:\PROJECi11931013.20U-IIGHUNE. R PT C -1 " DRAFT z z ce w 00 w0• U) w = cn 0 w 2 LL Q' =a �w Z= I-0. Z w 2 o. y w u LL 1— .Z' w V =` z should not deviate by more than 50 pounds per square inch (psi). If the creep movement still exceeds 0.040 inches per log cycle of time, then the anchor does not meet the acceptance criteria. If the anchor has secondary grouting capabilities, it may be regrouted and retested. Otherwise, the anchor may be rejected or derated to a lower capacity. In addition, the minimum apparent free length at the maximum test load, as calculated on the basis of elastic movement, should be equivalent to not less than 80 percent of the design free tendon length plus the jack length. The maximum apparent free length at the maximum test load, as calculated on the basis of elastic movement, should be less than 100 percent of the free length plus one -half the bond length, plus the jack length. Total movement of the anchor should not exceed 6 inches during the verification or proof testing. If the anchor fails to meet these criteria, then the cause shall be investigated and the anchor may be rejected or derated to a lower capacity. If the anchor has secondary grouting capabilities, it may be regrouted and retested. Tieback anchors meeting the acceptance criteria should be locked off at 75 to 80 percent of the design load. SOIL NAIL TESTING AND ACCEPTANCE Nails to be tested should be initially grouted no closer to the excavation face than 5 feet for nails that have test loads (TL) less than 10 kips and 10 ft for nails that have TLs greater than or equal to 10 kips. The minimum bond length of a test nail should be 5 ft. The TL is determined by multiplying the grouted bond length by the design load transfer. Load testing should be performed against a temporary bearing yoke which bears directly against existing soil. Temporary bearing pads should be kept a minimum of 12 inches from the edges of the drilled hole unless a rigid steel plate is used to distribute the stress around the drilled hole. If a steel plate is used, it should be a minimum of 3 ft square and of sufficient thickness so that it will distribute the load evenly to the soil. The test load is applied using a hydraulic jack and pump with actual loads monitored with a calibrated electric load cell or pressure gauge. A dial gauge or vernier scale capable of measuring to 0.001 inch of the ground anchor movement is also needed. The movement - measuring device should have a minimum travel equal to the theoretical elastic elongation of the total nail length plus 1 inch. The dial gauge or vernier should be monitored with a reference system that is independent of the jacking system and excavation face. 06/16/98 1:tPROJ ECr1I93\013.20\1IGHLINE.RPT C -2 DRAFT z 1. ~w re g JU 0 NO U) J CO U. w0 g J- LL ?' = F- w _ Z� F- O. Z F-.. LU D p' nO F-' 1I 0 U. O. Z: CO O 1--' Z Q • • • w- u6D • •J U.0 • u)w. • J �. CO w w 0. g J; 22 O H= • t-0' Z 1- • ;O U, ww iL 0; w '0 ~` Z PROOF TESTING Five percent of the production nails should be proof tested. Due to the need for a non - bonded zone for testing purposes, the Contractor's installation method should assure the stability of the non - bonded portion of the hole during testing and will allow for the non - bonded zone to be grouted against the soil after testing. Proof tests are performed by incrementally loading the nail to 150 percent of the test load in accordance with the load schedule in Table C -4. Anchor movement is measured and recorded to the nearest 0.001 inch with respect to an independent fixed reference point in the same manner as for the verification tests at the alignment load and at each increment of load. The load is monitored with a pressure gauge and electronic Toad cell. The recommended scheduling of hold times per load increment is also present in Table C-4. The maximum load in a proof test shall be held for 10 minutes. The load hold period shall start as soon as the maximum test load is applied and the nail movement with respect to an independent fixed reference shall be measured and recorded at 1, 2, 3, 4, 5, 6, and 10 minutes. The nail movement between 1 minute and 10 minutes shall not exceed 0.04 inches. If the nail movement between 1 and 10 minutes exceeds 0.04 inches, the maximum test load shall be held an additional 50 minutes. If the load hold is extended, the nail movement shall be recorded at 20, 30, 50, and 60 minutes. If a nail fails in creep, retesting will not be allowed. A proof tested nail is acceptable if: 1. The nail carries a load of 1.5 TL with less than 0.04 inches of movement between 1 minute and 10 minutes, unless the load hold extended to 60 minutes, in which case the nail would be acceptable if the creep rate does not exceed 0.04 inches per log cycle of time. 2. The total movement at the maximum test load exceeded 80 percent of the theoretical elastic elongation of the non - bonded length. 3. The creep rate is not increasing with time during the load hold period. 06/16/98 L PROJECT \193\013.20\I -iIGHUNE.RPT C-4 DRAFT • TABLE C -1 TIEBACK ANCHOR LOADING SCHEDULE FOR 200 PERCENT VERIFICATION TEST Loading Schedule AL AL AL AL AL AL AL 0.25 DL 0.25 DL 0.25 DL 0.25 DL 0.25 DL 0.25 DL 0.25 DL 0.50 DL 0.50 DL 0.50 DL 0.50 DL 0.50 DL 0.50 DL 0.75 DL 0.75 DL 0.75 DL 0.75 DL 0.75 DL 1.00 DL 1.00 DL 1.00 DL 1.00 DL 1.50 DL 1.50 DL 1.50 DL 1.75 DL 1.75 DL 2.00 DL AL = Alignment Load DL = Design Load 06!16/98 I WROJECI\193W13.2y - fGHLINE.RPT AL DRAFT TABLE C -2 TIEBACK ANCHOR LOADING SCHEDULE FOR PROOF TEST Loading Schedule AL = Alignment Load DL = Design Load 06/16/98 I:\PROJEC \I931013.20WIGHLINE.RPT AL 0.25 DL 0.50 DL 0.75 DL 1.00 DL 1.33 DL AL Lockoff DRAFT TABLE C -3 SOIL NAIL LOADING SCHEDULE FOR VERIFICATION TEST Load Increment Recommended Hold Time AL 1 minute 0.25 TL 5 minutes 0.50 TL 5 minutes 1.00 TL 5 minutes 1.25 TL 5 minutes 1.50 TL 5 minutes 1.75 TL 5 minutes 2.00 TL 10 minutes AL = Nail Alignment Load TL = Test Load 06/16/98 1:1PROJ EC1119310I 3.20W IG HLIN E. RPT DRAFT ,. TABLE C -4 SOIL NAIL LOADING SCHEDULE FOR PROOF TEST Load increment Recommended Hold Time AL 1 minute 0.25 TL 5 minutes 0.50 TL 5 minutes 1.00 TL 5 minutes 1.25 TL 5 minutes 1.50 TL 10 minutes AL = Nail Alignment Load TL = Test Load 06/16/98 I:\ PRO.' ECT1193\013.20 HIGHLINE.RPT ,•. •�;�?: 0 V • • cc rit ° KEY TO BORING LOGS Indicates Interval from which Disturbed Sample was Extracted 12% 314— Blows Required to Drive 2.0 -inch 0.0. Split Barrel Sampler 1 Foot with a Hammer Weight of 140 Pounds and a Stroke of 30 Inches Natural Moisture Content Ground Water as Noted at Time of Drilling (ATD) MAJOR DIVISIONS UNIFIED SOIL CLASSIFICATION SYSTEM GRAPHIC LETTER SYMBOL SYMBOL. TYPICAL DESCRIPTIONS COARSE- GRAINED SOILS (More than 50% of material is larger than #200 sieve size) GRAVEL AND GRAVELLY SOILS (More than 50% of coarse traction retained on #4 sieve) CLEAN GRAVELS * g a b : GW Well- graded gravels; gravel/sand mixtures; little or no fines Poorly-graded gravels; gravevsand mixtures; little or no fines Silty gravel; graveVsand/silt mixtures Clayey gravels; graveUsand/silt mixtures (Little or no fines) O :'•: • • • • • :. ' b; ■ • G?' GP GRAVELS WITH FINES (Appreciable icrir amount of fines) •:' I • : e��' @� ��: f '. a' •,1;����tl lib ir$43 5; -• °. • i ' qq GM III GC SAND AND SANDY SOILS (More than 50% passed though #4 sieve) CLEAN SAND SW Well- graded sands; gravelly sands; little or no fines Poorly-graded sands; gravelly sands; little or no fines Silty sands; sand/silt mixtures Clayey sands; sand/clay mixture (Little or no fines) SP WITH FINES ES (Appreciable amount of fines) ...1 V(( 1 i i SM SC FINE - GRAINED SOILS (More than 50% of material Is smaller than #200 sieve size) SILTS AND (Liquid Limit less CLAYS than 50) ML CL Inorganic silts and very fine sands; rock flour; silty or clayey -fine sands or clayey silts with slight plasticity Inorganic clays of low to medium plasticity; gravelly clays; sandy clays; silty clays; lean clays Organic silt; organic, silty clays of low plasticity In: . OL • SILTS AND CLAYS (Liquid Limit greater than 50) '.r.'x'r.r' IIIIII j 1rrr.4.iw4 ir iy MH CH . OH Inorganic silts; micaceous or diatomaceous fine sands or silty soils Inorganic clays of high plasticity; fat clays Organic clays of medium to high plasticity; ty; organic silts HIGHLY ORGANIC SOILS �r PT Peat; humus; swamp oils with high organic contents Note: Dual letter symbols (i.e., SM/SP) indicate borderline soil classifications. Only the first letter symbol's respective pattem is shown on logs. LANDAU ASSOCIATES, INC. I Key and Unified Soil Classification System • Figure A -1 Depth (feet) 0 BOR -1 Approximate Elevation 430 ft. 10— 6% 1 29 6% T 23 SM SP SP 2 inches Asphalt Concrete Brown, gravelly, fine SAND with silt; upper 2 in. is crushed rock subbase (medium dense, moist) (subbase/fill) Brown, fine to coarse SAND with occasional fine gravel (medium dense, moist) Completed to 6.0 feet on 2/1/91. No ground water encountered. LANDAU ASSOCIATES, INC. I Log of Boring BOR -1 Figure A -10 '., ? Depth (feet) 0 9% 121 4% J25 6% 128 10 BOR -2 Approximate Elevation 435 tt. 2 Inches Asphalt Concrete Brcfwn, sandy, fine to coarse GRAVEL with silt (medium dense,moist) (subbase/crushed rock fill) Tan -brown with occasional rust mottling, fine to coarse SAND with scattered coarse gravel (medium dense, moist) Completed to 6.5 feet on 2/1/91. No ground water encountered. LANDAU ASSOCIATES, INC. Log of Boring BOR -2 .. \.. .: ^.. Int rra A -11 H U w H as) _ z CL � w � w W 1- ix as w W c� Z. O 0 ° =w E- Q z 0 0 Z W J a J CC O 0 U CC 1- Z W J W W ON GAL. RESERVO J J c0 N - CRESTV R CONSTRUCTION 0 cc W W cc z 0 J �Q V z 0 c0 N 1 J U. U. 0 U_ 1- W 0 NOT FOR CONSTRUCTION re 0 U 1 r 8 1 I LOCATION MAP kt `sus M '.�`,�i� rh g gF U F = a c, U a §� a mom ljt x a , Z a �} C 1� • i i I z 1 5 ,?...: UMW 1111 NVI RESERVOIR SECTION 5 44 a 4 a 60."11 E4g 8n „e §y WB4:2`E 0 bag d e., s $� 1 haltagraWM Q! 8 4 3m IN pii N 30 A 2A4 e; N ff z 2a; e Z 2 u '-N u4 \..� /g • bi W 2 ”: hi 0 • 3 ZS i 3 yWa�aa a F SF` F R F C C C m `' y2 F P 8 88 E EREld §E� M ® y h II 1,0 01! C C F F F F F X F X d xyy P a E EEEEEEEE¢ � U Orr I II �1 1111 II ii NOT FOR CONSTRUCTION z z z z i �` z W UO' N p: W =: O w it J. N d, = F- W _ Z Z� tul O N W W, • 0. 1- • H. ▪ Z' F- =— O z H1091, 's `,- re W'. U O° cnra N W =' J � CO LL W Cr! J a. W; i-pi.. Z di !Co W W, . VC IL" 0', Z.. W � 0 z • d 2< 2j 00001DDDD '9( 0 EXISTING TREES TO REMAIN EXISTING SHRUB TO REMAIN ' 7 4r-- 0 4 NW NOT FOR CONSTRUCTION coo 1 7 LANDSCAPE PLAN Parametrix, Inc. fi i 6 a a 3 "; • File: • 5 60' SY 10• .7 GENERAL NOTES TOTAL BUILDING AREA TO BE DEMOLISHED = 27,000 S.F.* , 1r • TOTAL IMPERWOUS SURFACE TO BE REMOVED = 40,000 SF TOTAL RESERVOIR SURFACE AREA = 31,000 S.F. ± WATER RETURN LINE TO CRESTVIEW PUMP STATION GRAVITY OVERFLOW LINE 4TH ORDER CONTROL , 15' BUFFER 7.6 MILLION GALLON RESERVOIR PHASE 11 f , • 1 _ PHASE CONSTRUCT 6 HIGH CHAIN LINK •<(,...If SECURITY :...1; • • %K.:, PHASE II CLEARING & GRUBBING, REMOVAL OF STRUCTURES & OBSTRUCTIONS AREA • )1* • ' . -• . EXISTING • AC WALK \\ \\ \ .\ PHASE I SECURITY FENCE BETWEEN PHASE I & II TO BE REMOVED DURING PHASE 11 CONSTRUCTION CONTRACTOR PARKING FOR PHASE 1 — SCHOOL DEMOLITION .1.1 PUBLIC PARK PARKING FOR . PHASE II — RESERVOIR CONSTRUCTION' PAVED TRAIL FOR PARK & BALL FIELD ACCESS PHASE 11 RESERVOIR CQNSTRUCTION 7, • • • • • • • • • • .• • PHASE 1 CONSTRUCT 6' HIGH CHAIN LINK SECURITY FENCE COVERED WALK TYP. PHASE 1 — CRESTVIEW ELEMENTARY SCHOOL (DEMOLITION) CLEARING AND GRUBBING, REMOVAL OF STRUCTURES AND OBSTRUCTIONS AREA SCHOOL BLDG. TYP. • 1), 245± REF PROPERTY LINE LAIFWArt4P7.-. roz ri PwA wAr■ wl rw. 42/41/Ater■P v-- /Ur 190't REF LLI CC ,it, 141111 IMMUNE WATER DISTRICT WATER STORAGE IMPRON1010413 PROJECT MILLION GAL RESERVOR PLAN TUKWILA. WASHINGTON 21-2714-Ot I "A""al. 27140106. NOT FOF1;;;;1TRU TI N SITE PLAN PHASE I SCHOOL DEMOUTION PHASE II RESERVOIR. CONSTRUCTION SITE PLAN FOR RESERVOIR/SCHOOL DEMOLITION rawing# • 111,i.14(1111111rili!(11,11111,1,1111,1 111111111.1111[1•111111i)litifililiatill(11(id 11011011..11110:i • • • SOUTH 160T GRAVITY OVERFLOW LINE 4TH ORDER CONTROL 15 BUFFER 7.6 MILLION GALLON RESERVOIR PHASE II GENERAL NOTES - .1,3 TOTAL BUILDING AREA TO BE DEMOLISHED = 27,000 S.F, t , ,):. I 1 ■ ,t. 11 TOTAL IMPERVIOUS SURFACE TO BE REMOVED = 40,000 SF ± V-:.-i, TOTAL RESERVOIR SURFACE AREA = 31,000 S.F. t A PHASE II CONSTRUCT 6' HIGH CHAIN LINK -edSECUR/ TY 1‘, ;re."' • ''‘Cs..,:lt•t•• • .;"; ;459 itk 1 ; / .si• 4. ! PHASE 11 CLEARING & GRUBBING, REMOVAL OF STRUCTURES & OBSTRUCTIONS AREA - 2.• •-•?.tf'"..: • • is: EXISTING . • 'Ar AC WALK • \\ • ■ \:\ PASE I SECURITY FENCE BETWEEN PHASE 1 & II TO BE REMOVED DURING PHASE II' CONSTRUCTION CONTRACTOR PARKING FOR PHASE 1 — SCHOOL DEMOLITION PUBLIC PARK PARKING FOR PHASE 11 — RESERVOIR CONSTRUCIONi • ' I PHASE 1 CONSTRUCT 6' HIGH CHAIN LINK SECURITY FENCE COVERED WALK TYP. PHASE 1 — CRESTVIEW ELEMENTARY SCHOOL (DEMOLITION) CLEARING AND GRUBBING, REMOVAL OF STRUCTURES AND OBSTRUCTIONS AREA ••4. •• ,S°•,* < • SCHOOL BLDG. TYP. PAVED TRAIL FOR PARK & BALL 'FIELD ACCESS PHASE 11 RESERVOIR CONSTRUCTION REF ArAir ...................................................... ...... cc c=im:film-. pa CIO • WAININSTON UMW Prole Onmertan angtenes ONSISSI Naomi WAS IOWAN MINIECT NYC IMMUNE WA= ONORICT MAW =RAGE IMPROVEMENTS PROJECT 7.6 MIUJON GAL NCIERVCIR PUN TUKWILA. WASHINGTON 21-2714-01 I nal."' 27140106. PROPERTY LINE 245'± REF NOT FOR COh TION SITE PLAN PHASE I SCHOOL DEMOUTION PHASE 0 RESERVOIR CONSTRUCTION SITE PLAN FOR RESERVOIR/SCHOOL DEMOLITION - • • • . • , , 1 fi't 0INCH ....• • •...• • P),!'1:',PJJ.L.),11'.,-1t!PdT.:IPJ14.!.0!1 • CHINA .. • . _ • • • .1k111111111111111(111111111•1111111[1.1idlIfilli111111.111116111111idllithalililiiiilill.iiiifibliki:1:1-111_1111.11.11.111,1411.1.ilikli1111111011. ,T File: Highline Water District proposal for a. 7.6 - 8.1 million gallon underground water reservoir REVIEW PROCESS • Pre - application conference with the City of Tukwila held December 18, 1997 • Public meeting regarding potential environmental impacts reviewed under State Environmental Policy Act (SEPA) held by Highline Water District consultants on January 14, 1998 • SEPA determination made by Highline Water District on March 26, 1998 • Required SEPA comment period extended to April 30, 1998 to allow for additional comment period on SEPA determination • SEPA determination covered all aspects of proposal including school demolition and removal, . removal of underground storage tanks on southwest side of school, construction of reservoir,' restoration of construction area • Application for Unclassified Use Permit from City of Tukwila filed on June 1, 1998 • Public Meeting on July 22,i 1998 • Hearing for permit approval scheduled for October 5, • 1998 before City Council JTH 160TH- STREET• 'r HS•T ,,),7 S' BUFFER _ AMNIA. .4 • WATER SUPPLY LINE TO RESERVOIR WAIER RETURN UNE TO CRESTVIEW PUMP STATION GRAVITY OVERFLOW LINE ITN ORDER CONTROL 15' BUFFER 7.5 MILLION GALLON RESERVOIR PHASE 11 5 IV 77. IN•L' rq W. GSM' 3•.' ( PHA C ?RI AIN UNK G NFRAI NOTES TOTAL BUILDING AREA TO BE DEMOLISHED - 17,000 S.F3 TOTAL IUPERNOUS SURFACE TO BE REMOVED - 40,000 SF 3 1 TOTAL RESERVOIR SURFACE AREA - •.31,000 SF. 3 1 PHASE 11 CLEARING & GRUBBING, REMOVAL OF STRUCTURES It OBSTRUCTIONS AREA 70' WOE CHAIN LINK CATE' SITE ACCESS CONTRACTOR PARKING FOR :1 PHASE 1 — SCHOOL DEUOUTION PUBLIC PARK PARKING FOR PHASE N — RESERVOIR CONS RUC PROPERTY LINE • EXISTING AC WALK P ASE 1 SECURITY FENCE SEMEN PHASE 1 k 11 TO BE REMOVED DURING PHASE N CONSTRUCTION PHASE I CONSTRUCT N'. HIGH CHAIN LINK SECURITY FENCE COVERED WALK TIP, PHASE 1 — CRESIVIEW ELEMENTARY SCHOOL (OEMOLIRa() CLEARING AND GRUBBING. ' REMOVAL OF STRUCTURES MO OBSTRUCTIONS AREA SCHOOL BLDG. TIP. PROPERTY LINE 715'3 REF PAVED TRAIL FOR PARK k BALL FIELD :7w ' i ACCESS PHASE N RESERVOIR CONSTRUCTION _ • ! 1X0'3 REF "N NAT INN r,Ir6 a. 1.11 NwrNHr,YW. t w ' M 1A Wql NN. I{7glq 14K CI MM �• 71- 7111 -N I TMw 711rNIN. • NOT FOR OONSTRU TI N SIZE PLAN • PHASE I SCHOOL DEMOLITION PHASE N RESERVOIR CONSTRUCTION • 1'I'I�I L'1'I!r!fill!I'1'ICI'1' I• I'1 '!'I.I 1'1rj 1'(�I'III'tI*iI!1!:I11tI l.i'l''11,II1;T'l • p INCH '" ;. CHINA, s-�L'u °z°~6�rFks%4 Ilfllllllllllllllllllllllllllllllllillll�lllllllll�lllilil�llilllliilillllllllllllllllllllll. illllld. �ll! I1► liiia, l�illlll !!iiilllilllllllli�lllllili� 1 is Highline Water District . proposal for a 7.6 - 8.1 million gallon underground water reservoir PARK IMPACTS • City of Tukwila currently Iesses portion of site from Highline School District for Crestview Park, including area affected by construction • Grass area where existing shelter is located will be area where tank will be installed • Existing shelter will be removed • All existing vegetation around tank area, including trees on northwest corner, will be removed • Ball fields to south and west of school will be available for use • On completion of tank, grass area will be reinstalled with irrigation system • Shelter will be installed at northeast portion of grass area • If park area is expanded in the area of former school site, specific park elements will be reviewed and decided following neighborhood input and City Council concurrence . • SO TH 160TH — STREET. �- WATER' SUPPLY LINE . -- FO RESERVOIR WATER RETURN LINE TO CRESTVIEW PUMP 1 STATION GRAVITY OVERFLOW LINE 1 4111 ORDER CONTROL 15' BUFFER '7.8 MILLION GALLON I RESERVOIR PHASE A 1 1 1 7✓ 5' BUFFER S 89• SO. Io F MOO. .4.••ir" \•.. .1�` � I , I CON R 1 NO C TOTAL IMPERVIOUS SURFACE TO BE REMOVED �3. ��) TOTAL BUILDING AREA TO BE DEMOLISHED 17,000 00 TOTAL RESERVOIR SURFACE AREA 31,000 SF. * 'N w i W I 1< PHASE R CLEARING k GRUBBING. REMOVAL OF STRUCTURES k OBSTRUCTIONS AREA 20' 1WDE CHAIN I [] • LINK GATE N SITE ACCESS CONTRACTOR PARKING FOR PHASE 1 - SCHOOL DEMOLITION PUBLIC PARK PARKING FOR PHASE 9 - RESERVOIR CONSTRUC EXISTING AC WALK PHASE 1 SECURITY FENCE BETWEEN PHASE 1 k 11 TO BE REMOVED DURING PHASE K CONSTRUCTION PHASE 1 CONSTRUCT 5' HIGH CHAIN LINK SECURITY FENCE COVERED • WALK TW, PHASE 1 - CRESTVIEW ELEMENTARY 5CH001. (DEMOLITION) CLEARING AND GRUBBING REMOVAL OF STRUCTURES AND OBSTRUCTIONS AREA CHOOL BLDG. FW. PROPERTY LINE 745'3 REF I:. PROPERTY LINE PAKD TRAIL FOR PARK k BALL FIELD RESERVOIR CONSTRUCTION ACCESS PHASE 11 L 19O'1 REF I' I'.F•f!.L�I:�.I�l��,�'III��rI�� 1� 1) 0INCH '' I CHINA.; 5L 4L EL Ll t -OrL s?`lrbrs�s Y,._,c �L h 'air d e.. Z � WO' , IlliilliiiliIIIIIiiiliiiililulliiililliglllilliililliililliliiilluuhilllillliuihiilhlil .11l 1u. ulil11. 10i110111llii6 11IIIIiIIlii1IIIIII rtw FA t•. rt��reS�[oya�n n1 rr a -,ni -01 I 2 NOT FOR OONSTPWJTIbN • SITE PLAN PHASE L SCHOOL DEMbUTION • PHASE II 'RESERVOIR CONSTRUCTION "" 'I -1 "1"� yr: 5 6 . salmi 1 L. Highline Water District proposal for a 7.6 - 8.1 million gallon underground water reservoir. NOISE MITIGATION • Must comply with City of Tukwila noise ordinance (TMC 8.22) • Construction noise received by residential properties is exempt from ordinance between hours of 7:00 a.m. and 10:00 p.m. (TMC 8.22.160) • Construction hours to be limited to specific times • •• Periods of high construction noise will be scheduled around peak traffic periods or other periods of higher than normal ambient noise levels • Equipment may not be left idling when not in use • All devices and equipment must have mufflers and other sound attenuation devices • Portable acoustic screens may be placed around noisy equipment SOJTH 160TH—STREET- 5' BUFFER 5 !o• So' 10• C 150 00. : � EHEBALAIIIES � TOTAL BUILDING AREA TO BE DEMOLISHED - 27,000 S.F.t —� TOTAL IMPERVIOUS SURFACE TO BE REMOVED - 40.000 F t TOTAL RESERVOIR SURFACE AREA .. JL000 SF. 3 1 WATER SUPPLY LINE -- . -- ~ - TO RESERVOIR 0 O N WD 0 Z "V WRIER RETURN LINE TO CRESTVIEW PUMP STATION GRAVITY OVERFLOW LINE 4m ORDER CONTROL 15' BUFFER 7.6 MILLION GALLON RESERVOIR PHASE II PHASE 11 CLEARING k GRUBBING. REMOVAL OF STRUCTURES k OBSTRUCTIONS AREA • F- • -.. -- • 70' INDE CHAIN • LINK GAVE SITE ACCESS CONTRACTOR PARKING FOR PHASE 1 — SCHOOL DEMOLITION I, PUBLIC PARK PARKING FOR PHASE 11 — RESERVOIR CONSTRUC PROPERTY LINE I ' PAVED TRAIL FOR 1 PARK k BALL FIELD �• 1 j ACCESS PHASE II • RESERVOIR CONSTRUCTION 150'4 REF EXISTING AC WALK PHASE 1 SECURITY FENCE &MEN PHASE 1 & R TO BE REMOVED DURING PHASE N CONSTRUCTION PHASE 1 CONSTRUCT 6' HIGH CHAIN LINK SECURITY FENCE COVERED WALK TIP. PHASE 1 — CRESTVIEW ELEMENTARY SCHOOL TOEUDURON) CLEARING AND CRUBBINO. REMOVAL OF STRUCTURES AND OBSTRUCTIONS AREA SCHOOL BLOC. TIP. 245'2 REF PROPERTY LMIE 1•' taw NfI l0' Mr.IwNr. Mw. vo =.„ c• WIFII W. WA KM NINA •• 8.7711 -21 1 imam. • NOT FOR OONRTRUITIL SITE PLAN • PHASE I SCHOOL DEMOUTION PHASE II RESERVOIR CONSTRUCTION r I( II,II 1 11 .1."111ll!411I11 Z � 11i.1•I I.I[1 61NCH' 1 w I rw.�t3t d��luyA. r gi Y_ 5'' 6. E ` Iliilliiilliiilllliiliiiililllliililii�iiluiluiiliiiilulili' iilliilliliillilllliiillilllilillliii.. �111uIl��ia��111�1�i1�i1�111i1i111111u1i1u11 I h!.I 7 i ICI ! X 11111 i T I?T11Tr'1'1 J.IT 7: I' I ! I 1�-1. a .ti Mt 1M Highline Water District proposal for a 7.6 - 8.1 million gallon underground water reservoir CONSTRUCTION PROCESS PHASE ONE: Approximately 3 months . • 42nd Ave S. access to be used for construction only. All access to park area will be from S. 164 • A six foot fence around school and existing parking area for grass area will be installed. Existing drive up for school will be used for contractor parking during demolition • Underground oil tanks will be removed • Asbestos abatement will occur prior to demolition • On completion of school demolition and related site work, 6 foot fencing around school will be moved to excavation area for reservoir. School area•will be grass seeded. Some existing landscaping will be undistrubed through demolition and removal process PHASE TWO: Approximately 12 months • School driveup area will be used for public parking during reservoir excavation, with trail link to park and ball field area along south side of former school area „ • Irrigation system will be installed • Following completion of excavation and construction of reservoir, area will be landscaped. New parking lot in original parkirig area will be created, to include access for handicapped meeting Washington State Barrier Free requirements • Temporary lane closures on S. 160th will occur during piping installation. One way traffic restrictions are anticipated to expedite piping installation SOJTH 160TH—STREET. WATER SUPPLY LINE — TO RESERVOIR WATER RETURN LINE 10 CRESTVEW PUMP STATION GRAVITY OVERFLOW UNE 1711 ORDER CONTROL 15' BUFFER 7.6 MILLION GALLON RESERVOIR PHASE 11 5' BUFFER S SW H'10' DENENELNQES TOTAL AREA TO BE DEMOISNED . 27,000 S.F.4 ~ TOTAL IMPERVIOUS SURFACE TO BE REMOVED - Ig000 SP 4 � TOTAL RESERVOIR SURFACE AREA - 34000 SF. S PHASE I1 CLEARING k GRUBBING, REMOVAL OF STRUCTURES k OBSTRUCTIONS AREA 1 re- —•• V) i W . 1 • 7•— a.— __.__.— Q WIDE CHAIN LINK o LINE DATE Z SITE ACCESS i LV PHASE 1 SECURITY FENCE SEWER PHASE 1 & R TO BE REMOVED DURING PHASE R CONSTRUCTION PHASE S CONSTRICT 6' HIGH CHAIN UNK SECURITY FENCE COVERED WALK TYP. CONTRACTOR PARKING FOR PHASE 1 — SCHOOL DEMOURON PUBLIC PARK PARKING FOR PHASE II — RESERVOIR CONSTRUC • PROPERTY LINE PHASE / — CRESTVIEW ELEMENTARY 501005. FOEMOUTIOV) CLEAR ANO GRUBBNNO. REMOVAL OF STRUCTURES AND OBSTRUCTIONS AREA '•t rscH0q. BLDG rYP. 745'4 REF PROPERTY LINE 1•' PAVED TRAIL FOR PARK •k BALL FIELD • ACCESS PHASE 11 RESERVOIR CONSTRUCTION NOT FOR OONSTRU61TIlN PHASE I. spIOOL- DO10Un0N PHASE 11 RESERVOIR CONS1RUCTION CHINA ' . r- �L "-d3 yf Lr{ .. .. � •:? 5 I.iilalul lllliliIiI I1 h i1ii011111111 1 Highline Water District proposal for a 7.6 - 8.1 million gallon underground water reservoir SAFETY MEASURES FOR RESERVOIR • Reservoir buried two feet below surface • Primary and backup inlet control valve system • Storage capacity allowing a minimum of 2 hours to respond should both valves fail • Plan to transfer water to other reservoir in Highline Water District system if valves and storage system fail to provide adequate control of water level • Overflow line into City of Tukwila storm drainage system • Designed to Zone 3 seismip design criteria • A temporary erosion control and sedimentation plan will be implemented during construction, including • preservation of existing vegetation 4. temporary seeding • mulching • graveling • fabric fencing • dikes • swales • I. SO 160TH--STREET 5 BUTTER 731, WATER SUPPLY UNE TO RESERVOIR DENERALIMES TOTAL BUILDING ILIPERWOUS SURFACE TO BE REMOVED 40,000 SFA-71 UILDING AREA TO BE DEMOLISHED 24000 SF.* TOTAL RESERVOIR SURFACE AREA 31,000 SF. WATER RETURN LINE TO CRESTWEW PUMP STATION GRAVITY OVERFLOW LINE 4M ORM CONTROL IS' BUTTER 7.6 MILLION GALLON RESERVOIR PHASE N PHASE 0 CLEARING !GRUBBING. REMOVAL OF STRUCTURES k OBSTRUCTIONS AREA EXISTING AC WALK r r • . 42ND L _ _ 7,77." - 20. WOE CHAIN UAW GATE SHE ACCESS CONTRACTOR PARKING FOR • PHASE I - SCHOU. DEMOLITION PUBUC PARK PARKING FOR PHASE N - RESERVOIR CONSMUC ION PROPERTY UNE PAM TRAIL FOR PARK k 0M4. nap ACCESS PHASE RESERVOIR CONSTRUCTION ASE 1 SECURITY FENCE BETWEEN PHASE 1 II TO BE REMOVED DURING PHASE N CCWSTRUCTION PHASE 1 CONSTRUCT ill' HIGH CHAIN UNK SECURITY FENCE COVERED • .WALK PHASE 1 - CRESTVIEW ELEMENTARY SCHOOL modounoto . CLEARING AND GRUBBING, REMOVAL CF STRUCTURES • AND OBSTRUCTIONS AREA satoct ewo. p. • 245.3 REF PROPERTY UNE '4 '4' • M.Mal)14* P'S=.4"- NO/WI Mt gmr.e.1,14.Mrtsr, 11-11%.-m MONA. - NOT FON • PHASE I SOHOOL DEMOUtION PHASE N RESERVOIR CONS1RUC1ION I I. iorilN11,11.1‘1,,,111,;,11111T,r.11:1,1,:!,:111:1:...,1,111,1 ..,,,,,.11I 111[11.,11,:il'!,l'i,11A1111-IP.1111,1ill.,,11;i111!, I rii rct t.''''4---:.t-'-'4 .5.-',74•47.4 . ='''t .F!!.!4■, ., ::,,,,- . ... „ ....,,;r.,.?,/,,..,,,..v..,-.. .i., . i .,..: w:,. i,..q,..,„,,,,,..,,ii„,,,,.., ,:.', ,1 ':' 4ii: 41. Cl ZL L,074,, .,i....,,,,.,.,, , .*: C., 1. '1.''.''' '''11 . I ,_ ,ffilliiildill Iiiimillffilai IiIiiiillliill,ffillimillliliiMIIIIIii,milliii,iiiilitRituilicAlilli HA!! , . 6 • Highline Water District proposal for a 7.6, 8.1 million gallon underground water reservoir PROJECT FACTS • Total excavation for 7.6 million gallon tank: 66,000 cubic yards • • Total excavation for 8.1 million gallon tank: 70,000 cubic yards • 20,000 - 22,000 cubic yards of material stockpiled for backfill • 3,000 cubic yards of onsitei fill for restoration of grass area over and around reservoir • 25,625 square feet of impervious surface will be removed at school site and covered with soil • Excavation depth will be approximately 40 feet to create reservoir area • Approximately 2 feet of earth will cover top of tank, to allow for planting of grass area • A metering station will be located approximately 1,100 feet west of tank, in lieu of constructing a new pump station • Approximately 2,100 truck trips required to haul away excavation material • Approximately 100 truck trips required to haul away. construction .debris • Approximately 400 truck trips required for hauling in pre -cast reservoir sections • Approximately 800 truck trips required to construct reservoir on -site . . • Unspecified amount of daily truck trips for associated services • Unspecified amount of daily truck trips of construction related employees SO 11-1 160TH — STREET. - WATER SUPPLY LINE TO RESERVOIR .. 't... WAIER RETURN LINE •" 70 CRESTVIEW PUMP STATION GRAVITY OVERFLOW LINE Im ORDER CONTRA I5' BUFFER 7.6 MILLION GALLON RESERVOIR PHASE 11 0 O to 42ND AVENUE •t =' 5' BUFFER 4j GELEISIAMES I I TOTAL BIA(DINC AREA TO BE DEMOLISHED - 27,000 Sr.* .TOTAL IMPERWOUS SURFACE TO BE REMOVED - 40,000 SF 3 TOTAL RESERVOIR SURFACE AREA - 34000 S.F. 3 PHASE CLEARING k GRUBBING. REMOVAL OF STRUCTURES k OBSTRUCTIONS AREA • EXISTING AC WALK • 20• NIOE CHAIN LINK GATE SITE ACCESS CONTRACTOR PARKING FOR PHASE 1 - SCHOOL DEMOLITION . PUBUC PARK PARKING FOR PHASE K - RESERVOIR CONSIRUC PROPERTY VINE ASE 1 SECURITY FENCE BETNEEN PHASE 1 k R TO BE REMOVED DURING PHASE N CONSTRUCTION PHASE 1 CONSTRUCT B' IIGII CHAIN LMN SECURITY FENCE COVERED WALK TIP. PHASE 1 - CRESTVEW ELEMENTARY SCHOOL DIEYDLRON) CLEARING AND ORUBBINO ' REMOVAL OF STRUCTURES AND OBSTRUCTIONS AREA PROPERTY UNE - PAVED (RAIL FOR PARK k BALL FIELD ACCESS PHASE 11 ('FL.••r`- • RESERVOIR CONSIRUCTIOV -)..� ` • NOT FOR OON�TRUOTION OMANI PHASE • I SCHOOL DENOUTION PHASE II RESERVOIR CONS1RUC110N I111:777111-1 '1 X11 1'1LI 111.1.1 11,1:1 111'11L 1' 1' 1'IJ1I'I'^1'I'1'1 q'I11!: Trltltlr -a 5 6 CHINA n „ } st 4� 472@a l: P C z. rp�0 IIIIIIIIIIIIIIIIIIIilllllllllllllll�llllllllllllll. Ililllu�illllllllllllililllf �llllllllllll�. Ililill .�IiJ1,�i�I�1111�1111(IiI�1l Ii111I1111111I1�lili) • 1 File: • —37 ••%.' c7.?prohvrir Iris1.33.771)-•■,, • •,•,4' • 1q74,9,11rmlf?..7117.—i.4.4 'r:114001Ifb't ir'stn New Metering Station Tie to CRPL #4 Crestview School (to be demolished) Highline 21-2714-01-130 ' I l'ITFITITTlipTi11-1-11 I 1 1.1 1 1 II II 1:1 i 1,1 1: 1, 11 FiTp 1-1 I: 6 L . ... 5 0 INCH ," CHMA I i'-;:•:4;•,,-,'',...,„:,.-:',,,,.,,;::;; ' ••,•;.,',..•' -':,':,..,., .,,,, . . ..,i . ;,-,.. , 41. 171. pi. • Zi ‘ '1'1,,,Vi=l1-.-I.?-111-);•,:..6:-;:.-,',;.:,:iii:''.L.,.. :iLc,•., •.`e,..,;„.4.,•,...t.'4. '-':4; c c.. 1.' ii-6"o , • .. „ - ....-,..."-...,04.— — .. - . hiiiiiiillIffili1111111111111111111iiidli)illiidlillli0.11111111111111ffilli111111111111111.01[11141.1h.01111111011111.1.111111111111 I 1 dI11,1111, .', 5 Highline Reservoir Cot File: 35mm Drawin . co a 9 v C.■ Approx. North 0 200' 400' Approximately Scale in Feet 8-7 — NEW PUMP STATION 8-6 S • -u 0 c Hi lOS 3f N3AV Zti /SOUTH 160th ST. / BOR-1 BOR-2 +9- TIE INTO EXISTING SEWER i; B-550 11.„..-----INTERCONNECTING PIPING. 11 11 L SEE FIGURE 2, FOR EKPLORATION LOCATIONS FOR RESERVOIR 1 1,. }, PROPOSED 7.6 MILLION GALLON RESERVOIR • Legend y B-5 BOR-2 e Approximate Boring Location Approximate Boring Location (this project) (South 160th Street pr Interconnecting Piping Site and Exploration Plan ,, . ,r,JTETT.,11titil. Tifill 1,1,11.1..I.,itiv.A,,111.11):LH).:1-.1,•11, .,...]::!]•lti,[1::r■li: ..'1•41.1:1:1.1,,,t1.1..rritifi,Lci..i.L11111 p•HT-1, • ,.....0.INCH.:, ••, . '..i'......•. •.',.-•• -••••." '..,::;:,..,,....,!.v., N'1,,,,,' :,,.7:7,r74 ,,!.•'...4.43.■:: • , •• •' .„ ...1, 5 -.• . • ; ..•.' ,' . • - 6 :•-:.••:CHINA:..,..'!... ' '. ‘.. :•.....1 :, . . .. ... .1• . -... . • .._... ..... i ... .....•...v.w 1 .... . . . . , 'tt , :.. • , J.,.,i•-,4• . SL ti,ci. 446*.•:, : 9,"4-.„•••• , "1.r‘:,. e .,. (sb 9' ••• • .; , . :f..111111111111111'11111111111111.11111111111iltn11111.111.1.1.111.1.1)1bili,11111.1.1.11thlitiniM1,11111.ffilltillji[1-110.111.1i1101i111)1_111.1111(6111:0111.11(.•!,. 12 A. ET Figure 3 • ; .1; E 0 a. z Approximate Excavation Limit 8-4 iBuilding Demolition 8-1 Fence Property Line 5' Buffer-1.X Area 1 0 60' 120' Scale in Feet • 15' Buffer Area Reference: Bose drawing by Porarnetrix 0 INcH- • • •,.•.• :•• • ••• '.• ' •,••••• .CHINA ••. • • ••44 5 ... • • • • • • • • 9L Vt. LI. 1 H. • '1'.."'6 0 • • "3 Existing Contours Approximate Excavation Limits Proposed Pipeline Proposed Reservoir Approximate B-1 0 Boring Location Reservoir Site and Exploration Plan Figure 2 .4 I