Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
SEPA EPIC-06-90 - CELLULAR ONE - CELLULAR BASE STATION
CELLULAR ONE NE CORNER OF LONGACRES WAY (S. 158T ") & NELSEN PL. EPIC -6 -90 PUBLIC NOTICE CITY OF TUKWILA APPLICATION FOR LAND USE. ACTION PROJECT: fo -1-' &41° Ce //iAlae. o1.a REQUEST: at#t rrt Z, lase #P0 v/41. Jns+zuct a cetlakr.g. pAc, bA-s-e. LOCATION: WOfes .we s t s gam" sort" CL Acres WAsti) p(t■ Netsctil PI -Ace . APPLICANT: I n sA`'ce9 Mob cl.e. THIS REQUESTED LA NIJ USE ACTION WILL BE DISCUSSED AT A PUB ' ' ; HEARING mARC 22, DATE: , 1990 TIME: 8:00 p.m. LOCATION: Council Chambers Tukwila City Hall 6200 Southcenter Boulevard Tukwila, WA 98188 J . l• DEPARTMENT OF COMMUNITY DEVELOPMENT (206) 433 -1849 AFF� AVIT OF OISTR UTION DIANN MARTINEZ hereby declare that: Notice of Public Nearing EJ Notice of Public Meeting [J Board of Adjustment Agenda Packet O Board of Appeals Agenda Packet O Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet 0 Notice of Application for Shoreline Management Permit 0 Shoreline Management Permit [I Determination of Nonsignificance 0 Mitigated Determination of Non - significance Q Determination of Significance and Scoping Notice 0 Notice of Action Q. Official Notice [I Other Q Other was mailed to each of the following addresses on MARCH 12, ATTACHED Name of Project CELLULAR ENE File Number EPIC -6 =90 , 1990. , HOLIDAY CORP —HELEN NELSEN PROPERTY TAX DEPARTMENT #526 1023 CHERRY ROAD MEMPHIS, TN 38117 COMMERCE NTG. COMPANY INCOME PROP. /BOONE P.O. BOX 4113 PORTLAND, OR. 97208 METRO ACCT. PAYABLE SORENTON PR 5432 - 50706— D50218 821 2ND AVENUE SEATTLE, WA 98104 JACK 0. NELSEN 1124 SUNSET AVENUE SEATTLE, WA 98116 HELLEN B. NELSEN 15643.W. VALLEY HWY. TUKWILA, WA 98188 O. R. c OK: CO PANY C N PACIF RR 'iR'. 2500 B'00 IEL`` 80020 BNSF BURLINGTON NORTHERN RR PROPERTY TAX DEPARTMENT 777 MAIN STREET, #2680 FORT WORTH, TX 76102 ROBERT F. LOSEY SR. WIWONA LOSEY 808 S.W. 4TH PLACE RENTON, WA. 98055 VERNON SCHACHT 8363 JUANITA DRIVE N.E. KIRKLAND, WA 98043 0.W. RR. NAV. COMPANY C/0 UNION PACIFIC RR CORP. P.O. BOX 2500 BROOMFIELD, CO 80020 City of Tukwila PUBLIC HEARING NOTICE Notice is hereby given that the City of Tukwila Planning Commission and Board of Architectural Review will conduct a public hearing on MARCH 22 1990', at 8:00 p.m. in the City Council Chambers at Tukwila City Hall, 6200 Southcenter Boulevard, to consider the following: Planning Commission Public Hearing 1. Case Number: d Nam EPIC -6 -90 CELLULAR ONE Applicant: INTERSTATE MOBILEPHONE COMPANY (CELLULAR ONE) Request: TO PLACE A PERMANENT 100' SELF SUPPORTING TOWER WITH CELLULAR ANTENNAS MOUNTED ON TOP AND A 12'X 28' ELECTRONIC EQUIPMENT SHELTER. '-'""1 NORTHEAST CORNER OF LONGACRES WAY (S. 158TH) AND NELSEN PLACE. 2. Case Number: i Nier e Applicant: Request: Location: Board of Architectural Review Public Hearing 1. Case Nurnberg- r 'Ja e. Applicant: Request: Location: 2. Case Numben •0"4e Applicant: Request: 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 Department. The City encourages you to notify your neighbors and other persons you believe would be affected by the above items. Published: Valley Daily News - 3 -13 -90 3 -18 -90 Distribution: Mayor, City Clerk, Property Owners/Applicants, Adjacent Property Owners, File City %f Tukwila PLANNING DEPARTMENT 6200 Southcenter Boulevard Tukwila, Washington 98188 (206) 433 -1849 FAX TRANSMISSION DATE /TIME• MARCH 12, 1990 11:00 A.M. T0: VALLEY DAILY NEWS (Name) (Company Name) (FAX #) DIANN MARTINEZ FROM: 4tANNVOUNIMAX FAX #: 433 -1833 PHONE NO: 433 -1849 SUBJECT: ATTACHED PUBLIC NOTICE PAGE(s)- 1 (+ Cover Sheet) COMMENTS: PLEASE PUBLISH IN THE 3 -13 -90 AND 3 -18 -90 EDITION OF THE VALLEY DAILY NEWS. City of Tukwila PUBLIC HEARING NOTICE Notice is hereby given that the City of Tukwila Planning Commission and Board of Architectural Review will conduct a public hearing onMARCH 22,19902, at 8:00 p.m. in the City Council Chambers at Tukwila City Hall, 6200 Southcenter Boulevard, to consider the following: Planning Commission Public Hearing 1. Case Number :d Aia c EPIC -6 -90 CELLULAR ONE Applicant: INTERSTATE MOBILEPHONE COMPANY (CELLULAR ONE) Request: TO PLACE A PERMANENT 100' SELF SUPPORTING TOWER WITH CELLULAR ANTENNAS MOUNTED ON TOP AND A 12'X 28' ELECTRONIC EQUIPMENT SHELTER. Lon,,./.,0 " NORTHEAST CORNER OF LONGACRES WAY (S. 158TH) AND NELSEN PLACE. 2. Case Number:4 1Qeb—e Applicant: Request: Location: Board of Architectural Review Public Hearing 1. Case Number x- No ,. e. Applicant: Request: Location: 2. Case Number* No—e, Applicant: Request: 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 Department. The City encourages you to notify your neighbors and other persons you believe would be affected by the above items. Published: Valley Daily News - 3 -13 -90 3 -18 -90 Distribution: Mayor, City Clerk, Property owners /Applicants, Adjacent Property Owners, File 1, WENDY BULL AFFIDAVIT OF OISTRIB,UTI0N hereby declare that: Notice of Public Hearing Q Determination of Nonsignificance [� Notice of Public Meeting [I Board of Adjustment Agenda Packet O Board of Appeals Agenda Packet J Planning Commission Agenda Packet [l Short Subdivision Agenda Packet C1 Notice of Application for Shoreline Management Permit [] Shoreline Management Permit [� Mitigated Determination of Non - significance 0 Determination of Significance and Scoping Notice O Notice of Action O Official Notice ❑ Other O Other was mailed to each of the following addresses on FRIDAY, MARCH 9, 1990. WASHINGTON STATE DEPT. OF ECOLOGY ENVIRONMENTAL REVIEW SECTION MAIL STOP PV -11 OLYMPIA, WA 98054 ATTN: SEPA Name of Project "CELLULAR ONE File Number EPIC -5 -90 Signa , 19 . AFFoDAVIT OF OI ST'R iliru T I 0 N I, DIANN,MARTINEZ , hereby declare that: Q Notice of Public Nearing Q Notice of Public Meeting El Board of Adjustment Agenda Packet Q Board of Appeals Agenda Packet Q Planning Commission Agenda Packet Q Short Subdivision Agenda Packet Q Notice of Application for Shoreline Management Permit O Shoreline Management Permit Q Determination of Nonsignificance Q Mitigated Determination of Non - significance Q Determination of Significance and Scoping Notice Q Notice of Action Q Official Notice O Other Q Other was mailed to each of the following addresses on MARCH 9 , 1990. ENVIRONMENTAL REVIEW SECTION CENTRAL OPERATIONS PROGRAM DEPARTMENT OF ECOLOGY CAMPUS MAIL STOP PV -11 OLYMPIA, WA 98504 -8711 Name of Project CEELULAR ONE File Number EPIC -6- 90/90 -1 -CUP WAC 197 -11 -970 MITIGATED DETERMINATION OF NONSIGNIFICANCE Description tion of Proposal SOUTHCENTER CELLULAR COMMUNICATIONS IS PROPOSING TO PLACE A PERMANENT FACILITY OF 100' SELF SUPPORTING TOWER WITH CELLULAR ANTENNAS MOUNTED ON TOP AND A 12'X 28' ELECTRONIC EQUIPMENT SHELTER. Proponent INTERSTATE MOBILEPHONE COMPANY (CELLULAR ONE) Location of Proposal, including street address, if any NORTHEAST CORNER OF LONGACRES WAY (S. 158TH) AND NELSEN PLACE. Lead Agency: City of Tukwila File No. EPIC -6-90 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 43.21C.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. 0 There is no comment period for this DNS This DNS is issued under 197 -11- 340(2). le dComments must b submitted by his MARCH 26. 1990 • proposal for 15 days from the date below. Responsible Official Rick Beeler Position /Title Plannin• Director Address 6200 Southcenter Boulevar Date Signature Phone 433 -1846 8 You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Planning Department. FM.DNS March 9, 1990 Cellular One EPIC -6 -90 (Permanent) Mitigation Determination of Nonsignificance SEPA Conditions: 1. No protest drainage LID Agreement is required for the conversion of the temporary tower to permanent tower. 2. Based on the soils report prepared by Rittenhouse -Zeman & Associates, Inc. Geotechnical & Environmental Consultants, dated January 11, 1990, recommend for deeper foundation support of the building /tower. B. All piles should be driven under the full time observation of the soils engineer and pile capacity should be confirmed with an appropriate dynamic pile driving formula. CitOof Tukwila % PLANNING DEPARTMENT 6200 Southcenter Boulevard Tukwila, Washington 98188 (206) 433 -1849 DATE /TIME: FAX TRANSMISSION MARCH 9, 1990 11:20 A.M. T0- VALLEY DAILY NEWS (Name) (Company Name) (FAX #) FROM: DIANN MARTINEZ FAX #: 433 -1833 PHONE N0: 433 -1849 SUBJECT. PUBLIC HEARING NOTICE PAGE(s): 1 (+ Cover Sheet) COMMENTS: PLEASE PUBLISH IN 3 -11 -90 AND 3 -18 -90 (VALLEY DAILY NEWS) City of Tukwila PUBLIC HEARING NOTICE Notice is hereby given that the City of Tukwila Planning Commission and Board of Architectural Review will conduct a public hearing on MARCH 22, 199Q at 8:00 p.m. in the City Council Chambers at Tukwila City Hall, 6200 Southcenter Boulevard, to consider the following: Planning Commission Public Hearing 1. Case Number: d 90 -1 -CUP CELLULAR ONE Applicant: GARY WAYNE- INTERSTATE MOBILE PHONE COMPANY Request: INSTALL A CELL BASE OF A 100 FOOT TOWER AND 3 15 -FOOT "WHIP" ANTENNAS Lev ho., NORTHEAST CORNER OF SOUTH 158TH STREET (LONGACRES WAY) & NELSON PL. 2. Case Number:4 Nn1c Applicant: Request: Location: Board of Architectural Review Public Hearing 1. Case Numbera- Applicant: Request: Location: 2. Case Number 44 Noe- Appl icant: Request: 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 Department. The City encourages you to notify your neighbors and other persons you believe would be affected by the above items. Published: Valley Daily News - 3 -11- 90/3 -18 -90 Distribution: Mayor, City Clerk, Property Owners /Applicants, Adjacent Property Owners, File ru 5674 ENVIRONM `NTAL REVIEW R0UTI16G FORM ITY OF TUKWILA Y •':; k EPARTMENT OF. COMMUNITYv, DEVELOPMENT EPIC: -0— ice' 0 Police.; . 0 parka/Flee DATE TRANSMITTED' /;*'--• RESPONSE REQUESTED BY „el1/20- -: STAFF, COORDINATOR j}ge /IL. ftr ' J/L fri DATE RESPONSE RECEIVED The attached environmental checklist: was: received regarding this project. • Please review and comment below to advlse the. responsible. official regarding the threshold determination:, The . :,environmental review`tile'Is available in the Planning Department through the above staff • l" coordinator >: Comments regarding the project you wish carried to the Planning Commission;, oard of4djustment and City Council should be submitted in the comment section below, • ;ITEM�:� ��:���, "wt.;�•'� ,� `� { ..,._ , �ytCOMMENT u tTlrl br; �� , iS ..1'.. "', 1 PERMANENT '"SEPA , " Flood„'.Co.ntrol ,Zone Permit • .Drainage Permit p T (j•i' bl. _ I r'•F I.i]: !rP.��.i 1 1 •1' �rw , Construction of east' and south property poor -m 0 • drainage'•improvements•with the conversion o` •;temporary'. to your permanent facility: ,1 -Add: This site liee within the flood plain of the .`. P -1' channel • (all' structures on the ' site will meet conditions of'the City's Flood: Ordinance. Regional ditch systems 'serving adjacent and • upstream :properties traverse through the .south and east-side .of. the development:,', '•Non- responsive: NGVD datum and lowest floor elevation required to make this determination along with review of F.I.R.M. and latest /best • "''information. 'Provide these elevations and then respond .to question. P:6- 3,A,6.. ,No oil /water separator nor swale•system shown on :plans.'' Without addressing water ' treatment from 'site' answerfor' this proposal' is "yes" leases � �r t 1�'....o.• d s e.,, . ` r. . �. F-. ,Ler.r,d ✓ S & C'� P ✓moo All imperviousservice site improvements, including driveway :'.and building structure (with oil base :;:roofing):, which are.', oil or other contaminant • 'producingsurfaces' require at minimum an oil /water separator 'prior • to. discharge into a downstream •storm drainage' system. P.7 - 2 . Yes - 'Identify temporary and permanent erosion control facilities to protect ditches and down &' stream storm system. r. P.14 - Provide /or describe on plans the easements by which thiedevelopment:,is allowed access from the site to th interaaction'of the public rights -of -way at Vela e�i`' P1/.' and S. 158th Street to the southwest. Comments prepared by: , 09114189 j Cellular m • ❑ o■■■■■ ■o ■ ■ ■• • o®■•■ • ❑ ®■■•■ • o®■INE • ©■■■■ • ❑ ommJack Pace Department of Community Development City of Tukwila 6200 Southcenter Blvd. Tukwila, WA. 98188 Dear Mr. Pace, As the lead engineer at Cellular One, I would like to take this time to explain the methodology in cell site selection and the reason for our permit request in the City of Tukwila. There are a four parameters that must be considered in the design of a cellular telephone system and in the placement of the cell sites that, collectively, operate as a system for a defined geographical area; for this discussion, the greater Puget Sound area. 1) CAPACITY The Federal Communications Commission has granted cellular carriers a restricted amount of frequency spectrum. To use this allocation efficiently, a strict frequency plan must be followed. Throughout cellular systems, frequencies are assigned to cell sites in a pattern that allows for frequency reuse and smooth system growth. To maintain this equilibrium, we limit the number of channels at each cell. When traffic requires more channels at a cell than is designed, a new cell is con - structed. By April of 1990, this will be the situation in Tukwila. The attached map shows the proposed Southcenter cell and two existing cells. Each cell has a three sectored antenna con- figuration with a design limit of 19 channels per sector. The sectors that are highlighted in orange are those that will reach capacity in April. To allieviate the traffic conjestion the new cell should be placed equidistant from the existing cells and /or in proximity of the demand (ie. I -5, I -405 and the commercial area of Tukwila). The proposed site this criteria. 101 Elliott Ave., Suite 435 Seattle, WA 98109 206/283 -8319 • • 2) INTERFERENCE PROTECTION The frequencies used for cellular can best be described as "line of sight ". To minimize potential interference in the Puget Sound area, the irregular terrain should be used to en- hance system design and performance. Local hills should be used to limit the cell's radiation pattern from extending beyond it's designed service area. In the site selection process for the Southcenter cell, cri- teria was established that the site must use the Skyline hill to limit the cell's radiation pattern. This would prevent interfering signal levels from extending up Lake Washington and into Bellevue. The Tukwila hill to the immediate north prevents the radiation pattern from reaching the industrial valley in south Seattle. With these natural obstructions we are able to serve only the area for which it is designed, Tukwila, south Renton, I -5 and I- 405/518. 3) TRAFFIC DISTRIBUTION As mentioned above, the Southcenter cell has a three sectored antenna pattern. To insure an even distribution of traffic, placement relative to the major highways is critical.The site has been placed between I -5, I -405 and highway 167 to be served by the SW, N and SE sectors respectively. To be lo- cated beyond any of these highways would result in at least one under utilized sector, and consequently, adjacent over utilized sector(s) requiring additional capacity site(s) in a shorter timeframe. 4) QUALITY OF SERVICE The Tukwila area currently has areas of relatively weak sig- nal strength and receives a high volume of customer com- plaints. The placement of the Southcenter cell should "fix" these areas while providing system capacity. It is important that the cell "sees" Interurban Ave., 518 east of I -5 and the interstate interchange. In the summer of 1989 we performed tests from the proposed site to confirm that the weaker areas would be improved. The attached plot can be laid on top of the map to see the relative signal strengths in the area. The black hexagons are existing sites and the red dots are other new sites not yet on the air.Green indicates the strongest signal levels with orange and red being the weakest. • • Once the design criteria has been established for each of the parameters described above, a site can be selected and a search area identified. The Southcenter site, because of it's unique requirements,has a finite search area.(attatched) The types of system changes we our experiencing in Tukwila are occurring throughout our system. Currently, Cellular One has 35 sites on the air in the Seattle area. By the end of 1990, another 30 will be constructed. While each of these sites are and should be reviewed independently from a land use perspective, I hope this letter explains their collective importance in the rapidly growing public mobile telephone network. Please contact me at your convenience at 283 -8319 should you have any questions or comments Sincerely, Philip Exley Manager of System Development LI ...... . . Dabney Pt Groat Pt .7. 1 . Faben ut 161.4111°"!9q til klul.. ill Point , Calkins Point Gee Poin poon., 0110110 I:11111111 11111111141/ mailiming% at 11 'nautili IP I 110 Affilt1 um m tais:_aqpII!II 1111 121& 111111111 lim=nii1111$11114194Ra innum• I • = i'•441.2..7.11111111 %ammo u PAROFFIt ••Ememsminu =aaumiiii I • s'• IlYa 111 \lir" fvfamood -SUbst ic A GO --Elliot MILWAUKEf India, • \l'e>,, • — • \ ThJf 9 - • • t rs; • 31 • ri Fiightsts Zenith : -rnmmupity ! ertti • ; ■ • 3M _, k CM c lairo""= Nivitt -.Am 1 NS NW I 1 tN Bu�fQe- P. —IIT R 4 iLongacre 1 Track I B M; 16 Rp p r O O CI) 5f7r JI Reservoir • BM 1 Q' SE-ARCH ARFA . BM 4,23 35 rm SCTRPERM.27 2/19/90 CITY OF TUKWILA COMMUNITY DEVELOPMENT DEPARTMENT Environmental Checklist A. BACKGROUND 1. Name of proposed project, if applicable: Southcenter Cellular Communications Site, Permanent Facility 2. Name of applicant: Interstate Mobilephone Company d /b /a Cellular One 3. Address and phone number of applicant and contact person: Gary Wayne Cellular One 101 Elliott Ave, Suite 435 Seattle, WA 98109 283 -8319 Nancy A. Ryan Aippersbach & Ryan 2122 222nd Place NE Redmond, WA 98053 4. Date checklist prepared: February 19, 1990 5. Agency requesting checklist: City of Tukwila, Community Development Department 6. Proposed timing or schedule (including phasing, if applicable): Conditional Use permit - 4 months (February -June) Permanent Site construction - 4 -6 weeks (June- July) 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No. This proposed permanent facility is to replace a temporary communication facility at the same site. i'Vli �ai11 FEB 23 1990 t ;; i W Ur (jr lif:V'AILA r. c.ANNING DEPT. The temporary facility will be removed once the permanent facility is operational. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. A soils analysis has been prepared by Rittenhouse Zeman Associates, dated January 11, 1990. (See Exhibit A). 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. The City is in the process of forming a utility local improvement district for improvements to storm drainage along Longacres Way (SE 58th). 10. List any government approvals or permits that will be needed for your proposal, if known. Conditional Use approval for the Permanent Facility FAA permit is NOT required (See Exhibit B) 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.) Place a 100' self supporting tower with cellular antennas mounted on top, and a 12'x28' electronic equipment shelter. The antenna include 12 directional antennas, 3 omni - directional antennas, and one drum antenna. The total height of the tower with antennas will be 115'. The approximate 9,075 square foot lease area (121'x 75') will be cleared of vegetation (including trees, and graded. An approximately 6' high security fence will surround the site. The graded area inside the fence will be finished with gravel. Perimeter shrub plantings will be provided, outside the fence to screen the equipment shelter and base of the tower. A temporary pole will remain on the site only as long as necessary to activate the permanent cell site facility. 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 may, 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. Northeast corner of Longacres Way (S. 158th) and Nelsen Place, in the vicinity of Southcenter. Located in an area of industrial development near Longacres. The site lies directly west of (the raised grade) Union Pacific railroad right of way, and the entrance to Longacres Racetrack, and east of the Puget Power transmission easement. 13. Does the proposal lie within an area designated on the City's Comprehensive Land Use Policy Plan Map as environmentally sensitive. No. B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other Valley floor. b. What is the steepest slope on the site (approximate percent slope)? Less than 2% on site. East of the site is an approximately 15' high railroad embankment. 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 property is developed, except for the portion to be used for the cell site. The existing warehouse building covers 19% of the property with impervious surface. A portion of the lease area has been filled with approximately 12 to 18 inches of sandy gravel. • The soils report indicates that subsurface soils consist of 23 feet of generally loose sands and very soft silt underlain by medium dense to dense sands. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. No surface indications of unstable soils are present. Based on subsurface conditions identified in the soils report, shallow foundation support of the equipment trailer would not be considered feasible unless some risk of settlement could be tolerated. Deep foundation support (driven piles) is recommended in the soils analysis. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Some clearing will occur to remove grass and shrubs. Much of the clearing will have occurred for the construction of the temporary pole and temporary trailer placement. Clearing /structural fill (see soils report) for preparation of tower and equipment shelter will be required. Approximately 2,000 cubic yards of fill would occur (based upon 2 feet of fill over the 9,075 lease area). f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Minimal, approximately 9,075 square feet of area will be cleared and graded. Storm water is expected to sheet flow to a small drainage swale at the eastern edge of the site or to be absorbed into the ground. The site is flat, and not susceptible to erosion by its topography. If erosion does occur during construction, straw bales or other erosion control materials will be placed at the edge of the property line to filter out any sediments that result from construction. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt, or buildings)? The permanent facilities will introduce approximately 600 square feet of impervious surface for the shelter and base for the tower. The balance of the site will be covered with gravel, shrubs and grasses. The existing warehouse building covers 7,125 square feet of the 38,013 square foot property. The Cellular facility will add 600 additional square feet of impervious surface for a • total coverage of 20% of the entire property. The Cellular facility adds an about 1% increase in the impervious surface. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Typical erosion and sedimentation control measures (hay bail or other appropriate materials) will be implemented in accordance with City regulations for the building permit. 2. Air a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. Light vehicular traffic during 4 -5 weeks of construction period. Approximately 1 trip per week (4 vehicle trips per month)generated by the facility. b. Are there any off —site sources of emissions or odor that may affect your proposal? If so, generally describe. None known. c. Proposed measures to reduce or control emissions or other impacts to air, if any: None. 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. The Green River is located about one quarter mile west of the site. The site does not lie within the floodway or floodplain of this river. 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. No. 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. Not applicable. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. No. 5) Does the proposal lie within a 100 —year floodplain? If so, note location on the site plan. No. 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. No. 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. 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. None. No waste material is produced by the proposal. The site will be unmanned, thus no water or sanitary sewage service is required. 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. Minimal runoff will result from the addition of approximately 600 square feet of impervious area around the base of the tower and under the equipment • shelter. There is an undefined drainage swale at the eastern edge of the site, which connects to a 12" CMP storm pipe running under S. 158th Street (Longacres Way). The City of Tukwila is initiating a ULID that will install storm drainage improvements along the north side of S. 158th Street (which will along the southern boundary of this site. The proposed plans call for a 36 inch storm drain line to be placed approximately 5' north of the centerline of S. 158th. The existing 12" pipe will be plugged and the water diverted into the new 36" storm drain. 2) Could waste materials enter ground or surface waters? If so, generally describe. No waste materials will be generated on the proposed site. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: None, appear to necessary, given the extent of improvements already planned by the City's ULID. 4. Plants a. Check or circle type of vegetation found on the site: x deciduous tree: alder, maple, aspen, other:cottonwood evergreen tree: fir, cedar, pine, other x shrubs: Blackberry x grass pasture crop or grain wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other water plants: water lily, eelgrass, milfoil, other other types of vegetation: b. What kind and amount of vegetation will be removed or altered? The construction of the tower and equipment shelter will require the removal of grasses, trees and berry vines and shrubs. Much of the vegetation will have been removed by the placement of the temporary pole and trailer on the site. The structures will require removal of existing cottonwood trees for safety reasons. c. List threatened or endangered species known to be on or near the site. None known. • d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Landscaping will be placed around the perimeter of the cellular facility after construction is complete. The proposed landscaping will be shrubs (as identified on the site plan) for screening the fence and equipment. 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: dear, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other: The site is in an urbanized industrial area. b. List any threatened or endangered species known to be on or near the site. None known. c. Is the site part of a migration route? If so, explain. Not known. d. Proposed measures to preserve or enhance wildlife, if any: Not applicable. 6. Energy and Natural Resources a. What kinds of energy (electrical, natural gas, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. The equipment shelter will require 20 -40 watt electrical service. There will be 12 directional and 3 omni - directional antennas, and one drum antenna located on the top of the tower. b. Would your project affect the potential use of solar energy impacts, if any: No. The permanent self supporting (lattice) tower will not prevent solar access to other structures. • 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? None. 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. No materials that could cause fire or explosion are known. Cellular radio power density levels are regulated by government as a potential environmental concern. A permanent cell site (100 foot tower, with directional, omni — directional and drum microwave antennas) will generate less than to 10 microwatts per square centimeter at an elevation of 52 feet from the antennas. (See power density readings from a tower with similar equipment, Exhibit C) By comparison, the EPA sets 2,500 microwatts per square centimeter as an acceptable level. 1) Describe special emergency services that might be required. None are anticipated to be necessary. 2) Proposed measures to reduce or control environmental health hazards, if any: None. b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other): None. This is a light industrial district fully developed. The existing noises will not affect this project. • 2) What types and levels of noise would be created by or associated with the project on a short -term or a long- term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. Minimal traffic during the 4 -6 week construction period. 3) Proposed measures to reduce or control noise impacts, if any: Hours of construction will be limited to between 7:00 a.m. and 7:00 p.m. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? The property currently contains an office /warehouse (Rawson Drugs) which a 7,125 square foot building. North - retail, warehouse /office (Mueller Brass, and ) South - vacant, undeveloped East - right of way (Union Pacific), Longacres West - PSLP transmission easement, retail (Daniel Boone Paint), warehouse /office /retail (Service America Corporation) b. Has the site been used for agriculture? If so, describe. Not recently, much of the valley floor was used for agriculture in the past. c. Describe any structures on the site. One building exists on the site outside the lease area. It is approximately 7,125 square feet and is office /warehouse use (Rawson Drugs). d. Will any structures be demolished? If so, what? No. e. What is the current zoning classification of the site? M -1 (Light Industrial). • f. What is the current comprehensive plan designation of the site? Light Industrial. g. If applicable, what is the current shoreline master program designation of the site? Not applicable. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. No. i. Approximately how many people would reside or work in the completed project? None. This site will be unmanned. Semi— monthly maintenance visits will involve one person. j. Approximately how many people would the completed project displace? None. k. Proposed measures to avoid or reduce displacement impacts, if any: None. Proposed measures to ensure the proposal is ompatible with existing and projected land uses and plans, if any: The surrounding land uses are older industrial buildings and electrical power poles and lines. The cellular tower and shelter will blend in with the existing industrial and utility uses adjacent to it. Some new construction is also taking place along the West Valley Highway, not far west of the site. The • proposed pole will not be significantly visible along West Valley Highway when the new construction is complete, because the site was located far enough from the highway that the buildings will shield it from view. m. Proposed measures to avoid or reduce shoreline and land use impacts are: None. • 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low— income housing. Not applicable. b. Approximately how may 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. 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 height of the tower with antennas will not exceed 115'. The tower itself will be 100 feet and three omni— directional antennas will extend the height by 15'. (See Exhibit D, Tower photos) A 12 foot by 28 foot concrete shelter with washed aggregate walls will house ;the necessary electronic equipment. The equipment trailer will be under 12 feet high. The Puget Power transmission tower adjacent to the site is about 110 feet high, according the Puget Power. b. What views in the immediate vicinity would be altered or obstructed? None. c. Proposed measures to reduce or control aesthetic impacts, if any: Vegetative screening will be provided around the perimeter of the cell site (just outside of the proposed security fence). The tower (which matches some of the Puget Power towers in the area) and the equipment shelter are similar in character with the immediate industrial area. The permanent facility is to replace a temporary pole and equipment trailer. • 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? None. The height of the tower was filed with an FAA approval (FAA study number 89 ANM- 0993 -0E) and the height does not require special lighting. No other light will be generated by the proposal. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. c. What existing off -site sources of light or glare may affect your proposal? None. d. Proposed measures to reduce or control light and glare impacts, if any: None are anticipated to be necessary. 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? Not applicable. b. Would the proposed project displace any existing recreational uses? If so, describe. No. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: None. 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. None known. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None known. 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. Longacres Way (South 158th) and Nelsen Place serve the site directly. West Valley Highway, State Route 405, and Interstate 5 all serve the area surrounding the site. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? Yes, Metro routes 150 and 124 serve this area. c. How many parking spaces would the completed project have? How many would the project eliminate? The project will require no parking spaces and will not eliminate any existing parking on the site. The semi - monthly maintenance visits will require one car to be parked in the existing parking area with no adverse impacts. 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). No. Nelsen Place is a private road with no driveways delineated. e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. The site will not require rail transportation, but there is an existing Union Pacific Railway right of way to the east of the site. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. One vehicle, semi - monthly. • g. Proposed measures to reduce or control transportation impacts, if any: None will be required as a result of low impact by proposed construction. 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. No. To provide security, the tower and shelter will be enclosed with an approximate 6 foot high chain link fence topped with 3 strands of barbed wire, a steel door is provided on the concrete shelter and properly posted warnings will be included. The. building and tower are alarmed and monitored 24 hours a day by an operations center. The equipment trailer is unmanned with self— extinguishing fire protection (halon system). b. Proposed measures to reduce or control direct impacts on public services, if any. None are anticipated to be necessary. 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. Electricity — Puget Power Telephone — U.S. West Communications 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: • E. SUPPLEMENTAL SHEET FOR ALL PROJECT AND NON PROJECT PROPOSALS The objectives and the alternative means of reaching the objective for a proposal will be helpful in reviewing the aforegoing items of the Environmental Checklist. This information provides a general overall perspective of the proposed action in the context of the environmental information provided and the submitted plans, documents, supportive information, studies, etc. 1. What are the objective(s) of the proposal? The goals of the proposal are: o to provide improved cellular service (reducing or eliminating bouts of interrupted service) in the area of the confluence of I -5, I -405 and the Valley Freeway.; o to provide critical coverage of both existing mobile telephone service subscribers ( which includes the Tukwila Fire Department) and Goodwill Games users. Cellular One is providing security cellular telephone service for the Goodwill Games. This site will also provide service for the Sea -Tac airport, where athletes, officials and dignitaries for the Goodwill Games will be arriving and departing; o to locate both the temporary facility and the permanent facility on the same site, and remove the temporary once the permanent cell site is activated. An exhaustive search of 76 parcels - were contacted to ultimately find this needed site. 2. What the alternative means of accomplishing these objectives? Alternatives means to these objectives are not, currently available. Cell sites area oriented geographically in a hexagonal grid pattern. Each cell base station is located a certain distance from neighboring cell base sites sot that it will provide service to a specific geographic area, based on multiple factors including; traffic distribution, topographical features, radio interference concerns and quality. • Accordingly, cell site locations are characteristically located in areas where the cell site is nearby to freeways or heavily travelled arterials, where the line —of —sight between roadway and cell site is minimally obstructed, and preferable away from hilltops and other prominent land features where radio towers are typically located to avoid intersystem interference. To provide system coverage in densely populated areas, the search for a cell base site is quite small, often one —half mile or less in diameter, depending upon topographical factors, i.e. the presence of valleys, hills, bodies of water which either stop of extend radio coverage causing either a loss of service or a "skipping of radio propagation for long distances and thus destroying service by causing intersystem interference. The confluence of multiple freeways such as exists in Tukwila (I -5, I -405, and the Valley Freeway) is a key factor in locating effective cell sites ans . providing quality transmission and service. Much like the growth pressure experienced from new businesses locating in Tukwila, McCaw Cellular Communications is experiencing increased public demand for cellular telephone service. There are approximately 50,000 cellular users in the Seattle area. This number is doubling every two and one — half years. In the Tukwila area, the net result of the increased demand is the rapidly worsening bouts of interrupted service in this area. The proposed facility is essential to the public need. The location of this cell site will provide critical communication coverage to both the existing mobile telephone service subscribers (which includes the Tukwila Fire Department) and the Goodwill Games users. In addition to technical factors, Mc Caw must also located property owners within the search areas which are willing to accept cell site facilities on their properties. For this site, one hundred and forth eight (148) parcels were identified in the search area and of the 148, 76 were further identified as being suitable. Each of the 76 were contacted and negotiations began. Once negotiations were concluded for this site, drive tests were conducted to ensure suitability of the site. 3. Please compare the alternative means and indicate the preferred course of action. Given the in -depth search for a suitable location, no alternative to the proposal will achieve the objectives. The preferred course of action is the proposal. 4. Does the proposal conflict with policies of the Tukwila Comprehensive Land Use Policy Plan? If so, what policies of the plan. There are no specific goals and policies of the Tukwila Comprehensive Plan which address this type of utility. However, the proposal does improve the overall cellular system by increasing capacity and providing the users with the Tukwila area with improved quality of service which is a general goal of the Comprehensive Plan for the Transportation/ Utility Element of the Plan. Proposed measures to avoid or reduce the conflict(s) are: No conflict will occur. SCTRPERM.27 2/19/90 Antic rower ttslc �r� tlr�iatc� "2 0.0011 I 0.0010 -1 Mi .ar�s;.�y �_if K {: rowav we De :i a Mtn. al 15 Ft Height with 4nl6rina at 90 FI 1 t 0.0009 --1 ' ,\` J \ 0.0008 / \ N 0.0007 -= r ��, f i i ,,, 0.0005 -= ,� .\ f0.0 00 4 -= \ A i \, 0.0003 j. 11 _, --..., / 0.0002 -1 `� 2 0.0001 - I r1� 0.0000 I/V 1 i 0 2 4 6 8 10 Distance from Tower Base, kilofeel • • Microwave . 24g_r Density at King Mountain Antenna Height: Measurement Ht: Transmitter Power: Frequency; Antenna Gain: Feeder 'Loss: 90 feet 15 feet 0.1 watt 18 GHz 38.9 d8 b dB 27- Jul -88 tac Rockwell MDR-3118 Andrew HP2 -180E 100 ft EW180 Distance Angie Antenna distance From Below vertical From Power 'Power Horizon Pattern Antenna Density (Feet) (degrees)(dB) (Feet) (uW /cm "2) 0 90.0 -64.0 75.0 10 82.4 -64.0 75.7 20 75.1 -64.0 77.6 30 68.2 -64.0 80.8 40 61.9 -64.0 85.0 50 56.3 -64.0 90.1 60 51.3 -62.0 96.0 70 47.0 -57.0 102.6 80 43.2 -55.0 109.7 90 39.8 -51.0 117.2 100 36.9 -49.0 125.0 110 34.3 -47.0 133.1 120 32.0 -43.0 141.5 130 30.0 -43.0 150.1 140 28.2 -43.0 158.8 150 26.6 -43.0 167.7 160 25.1 -43.0 176.7 170 23.8 -43.0 185.8 180 22.6 -43.0 195.0 190 21.5 - 40.0 204.3 200 20.6 -40.0 213.6 250 16.7 -36.0 261.0 300 14.0 - 36.0 309.2 400 10.6 -29.0 407.0 500 8.5 -29.0 505.6 600 7.1 -22.0 604.7 700 6.1 -22.0 704.0 800 5.4 -22.0 803.5 900 4.8 -19.0 903.1 1000 4.3 -19.0 1002.8 1500 2.9 -19.0 1501.9 2000 2_ . 1 -15.0 2001.4 2500 1.7 -7.1 2501.1 3000 1.4 -4.4 3000.9 4000 1.1 -2.3 4000.7 0.000922 5000 0.14 -1.1 5000_C. 0.000778 6000 0.7 -0.3 6000.5 0.000649 8000 0.5 -0.3 8000.4 0.000365 10000 0.4 -0.1 10000.3 0.000245 15000 0.3 -0.1 15000.2 0.000109 20000 0.2 0.0 20000.1 0.000063 250u0 0.2 0.0 25000.1 0.000040 30000 0.1 0.0 30000.1 0.000028 0.000002 0.000002 0.000002 0.000002 0.000001 0.000001 0.000002 0.000005 0.000007 0.000014 0.000020 0.000028 0.000063 0.000056 0.000050 0.000045 0.000040 0.000036 0.000033 0.000060 0.000055 0.000092 0.000066 0.000190 0.000123 0.000432 0.000319 0.000245 0.000387 0.000314 0.000140 0.000198 0.000781 [0.0010101 Mar. RZA rpa#41.1.• RITTENHOUSE -ZEMAN & ASSOCIATES, INC. Geotechnical & Environmental Consultants 1400 140th Avenue N.E. Bellevue, Washington 98005 -4594 (206) 746- 8020 /FAX (206) 746 -6364 • r HUt . UUG 11 January 1990 W-6565 Cellular One 101 Elliott Avenue, Suite 435 Seattle, Washington 98109 Attention: Subject: Gentlemen: Mr. Al Mastroianni, Project Manager Limited Geotechnical Engineering Study Proposed Communications Tower Tukwila, Washington This letter presents the results of our subsurface exploration and limited geotechnical engineering study conducted for the above referenced project. The scope of work for this study was conducted per our proposal, P-3329. Verbal authorization to proceed with this study was granted by Mr. Al Mastroianni, of Cellular One on 4 December 1989. This report has been prepared for the exclusive use of Cellular One and their agents for specific application to this project in accordance with generally accepted geotechnical engineering practices. The site is located on the southeast comer of South 158th Street and Longacres Way in Tukwila, Washington as shown on our Site Vicinity Map, Figure 1. The site is relatively level. To the east of the site is an approximately 15 foot high railroad embankment, and to the north is an existing concrete building. Most of the site is vegetated with bushes and weeds with trees in the eastem half of the site. No standing surface water was observed across the site at the time of our field studies. We understand that a 100 -foot high transmission tower is to be built on the site supported by a monopole. A small equipment building is to be built immediately adjacent to the self - supported tower. Exhibit A to Environmental Checklist ni . L J Jtl 1 .J • 1 1 r r1ri tLLULHK VNt btH-1 I I LE • PAGE. 003 Cellular One W-6565 11 January 1990 Page 2 SUBSURFACE CONDITIONS One test boring was advanced to a total depth of 49 feet on 14 December 1989. The location of the boring is shown on the attached Site and Exploration Plan, Figure 2. Drilling was performed using a truck- mounted hollow -stem auger. Samples were obtained using the Standard Penetration Test Procedure as determined in ASTM:D- 1586. The samples collected were taken to our laboratory for visual classification. The log for this boring is presented at the end of this letter report. The soils encountered in our boring consisted of interbedded loose to medium dense sands and very soft silts and clays all underlain by medium dense to dense sands. From the ground surface, we encountered approximately 1 foot of topsoil above a 5 foot layer of medium dense silty sand, underlain by approximately 12 feet of interbedded very soft sandy silt to organic silty day. Below the interbedded sift /clay layer for approximately 5 feet was a loose sand with some silt. At 23 feet below the ground surface, the sand graded to medium dense. A medium dense to dense sand with some silt and gravel was encountered to the bottom of our boring at 49 feet. Groundwater was encountered at approximately 10 feet below the ground surface at the time of drilling. No observation well was installed in the boring. Groundwater levels may vary with changes in precipitation, season, the stage of the nearby Green River, site utilization, and other factors. CONCLUSIONS AND RECOMMENDATIONS The proposed project consists of a 100 -foot self supported monopole tower and associated building in Tukwila, Washington. The subsurface conditions disclosed by our boring, consisted of 23 feet of generally loose sands and very soft silt, underlain by medium dense to dense sands at depth. Based on the observed subsurface conditions, shallow foundation support of the equipment building would not be considered feasible unless the risk of some settlement could be tolerated. Recommendations for deep foundation support of the building and the tower are presented. . JLnf: V I Y C c.0 H I L C • PkGE . 004 Cellular One W -6565 11 January 1990 Page 3 Our subsurface exploration disclosed a near - surface 5 -foot thick layer of medium dense (N =12) sand, underlain by 12 feet of very soft silt and clay. Because of the presence of these relatively loose sands underlain by compressible silts and clays, significant settlements may occur as a result of the increased loading. Based on our boring made for this project and other borings made in the vicinity, we estimate settlements of 1 to 3 inches may occur as a result of an imposed loading of 1500 pounds per square foot on a conventional 15 inch footing embedded 1.5 feet below the ground surface. If the risk of some settlement could be tolerated, partial removal of soils beneath footing elevation and replacement with a structural fill could be considered. The greater the depth of soil beneath the footings which are removed and replaced with structural fill, the more settlement would occur as broad gentle warping rather than sharp, discontinuous breaks. You have indicated that such settlements would not be acceptable. We would therefore recommend utilizing a deep foundation system for supporting the small equipment building. In view of the relatively light loads anticipated for the equipment building, we believe that treated timber piles would likely provide an economical deep foundation system. Based on the boring drilled for this project, a firm bearing stratum for pile embedment purposes appears to be present at 23 feet below the ground surface. Timber piles would derive their capacity from a combination of friction and end - bearing. Treated timber piling with a minimum tip diameter of 8 inches would be capable of supporting design loads of 20 tons each when driven to a depth of about 35 feet. Timber piling should be driven with an air, steam, or diesel hammer capable of delivering 15,000 foot - pounds of energy. All piles should be driven under the .full time observation of the soils engineer and pile capacity should be confirmed with an appropriate dynamic pile driving formula. Foundation support for other cellular towers has typically been attained by construction of drilled piers. Based on our explorations, drilled piers would not be feasible to construct on this site, due to the high water table. We anticipate the loose sands below the water table would produce caving in the pier excavations. JHN UU 1 t: 1 L I NUhl LLLLULkR O E SCHTTLC n'AGC . Go5 Cellular One W -6565 11 January 1990 Page 4 Because of severe caving and high groundwater levels, casing the hole would apparently require dewatering in advance of construction. However dewatering to such great depths could produce significant settlement in the area, and would therefore not be advisable. Instead, we would recommend installation of a pile foundation which would limit disturbance of the soils. Possible deep foundation options would include augercast piles or driven timber piles. The timber pile advantages are low cost and relative ease of installation. The disadvantages of the timber piles are that uplift capacity will be limited depending on the depth of penetration into the medium dense to dense stratum that can be achieved. For augercast piles the advantage is that sufficient depth can be obtained to resist uplift. The disadvantage is that the depth of the pile is limited by the diameter used and that it is likely that more concrete will be needed than usual due to the very soft soils near the surface. The previous recommendations for driven piles for the equipment building will also apply for the tower. The following additional recommendations pertain to the timber piles. The bearing capacities available in the upper 23 feet of the pile should be neglected. For frictional resistance, acting both downward and in uplift, we recommend using an allowable skin friction of 0.2 TSF for that portion of the pile embedded below 23 feet. It is likely that the timber piles would only be capable of being driven to a maximum depth of 35 feet. Piles should be driven no closer then 3 times the diameter of the pile. For design of augercast piles, the following parameters will be applicable. The l'e Ali iiti,eiidCd veil= fu, Uvdr it c;aptiuIty for end - bearing capacity Is 1.6 D/b 15t- (in tons per square foot), where D is thA Amhedment depth (in feet) into the bearing soil (below 23 feet) and B is the diameter of pile in feet. The limiting allowable end - bearing pressures provided may be used for piers embedded at least 8 pier diameters into the bearing layers. For frictional resistance, acting both downward and in uplift, we recommend using an allowable skin friction of 0.1 TSF for that portion of the augercast pile embedded below 23 feet. The total length of the augercast pile should be limited to 30 times the pile diameter. JHN 'Lj 'JO 15:13 FROM CELLULAR ONE SEATTLE PAGE.666 • • • Cellular One W-6565 11 January 1990 Page 5 The response characteristics of a pile or pile group to lateral load depends on the structural configuration of the pile group. Lateral load capacities are generally governed by limiting pile deflection at the groundline or top of pile. The deflection will depend on the pile stiffness with respect to the soil, the length of the pile and degree of fixity at the pile head. Using the criteria presented subsequently, the deflection at the ground surface and maximum bending moments produced by a lateral load at the top of the pile can be determined. If very high lateral loads are to be resisted, it may be necessary to utilize batter piles. We assume the pile head is fixed against rotation. The lateral capacity which may be developed by granular soils surrounding the embedded portion of a single pile may be evaluated by elastic considerations. Parameters which impact this analysis include the elastic modulus (E) of the pile material, the shape of the pile (as it determines the moment of inertia. (I) of the pile) and the constant of subgrade reaction of site soils (nh). Using these values, the relative stiffness factor (T) if the pile can be determined based on the following equation, T= (El /nh)0.2. Values of nh to be used In the analysis are primarily a function of the consistency and texture of the soil which the pile penetrates. For the limiting condition of saturated, loose sand disclosed at the site, a value of nh of 4 pci (pounds per cubic inch) is recommended. For fixed head conditions, the moment and deflection can be calculated using elastic methods. The maximum deflection which occurs at the ground surface would be: y = 0.92 Pia /EI where P is applied shear Toad and the other terms have been previously defined. The moment at the ground surface and the maximum moment (at a depth of 2.0T) below the ground surface are ( -) 0.9 and 0.25 times the product of P times T, respectively. The lateral capacity of closely spaced groups of piles can be significantly different than that of a single isolated pile. Specifically, group effects tend to influence the deflection behavior of piles when they are spaced closer than about eight pile diameters in the direction of the applied lateral Toad. In general, the lateral deflections of piles in a group would be approximately twice that for a single isolated pile. Individual piles subjected to JAN 29 'Sly 15:14 FROM CELLULAR ONE SEATTLE PAGE.O07 • • Cellular One W-6565 11 January 1990 Page 6 repetitive cyclic Toads may result in deflection magnitudes up to twice that of a pile subjected to a static load. Therefore, for a given design Toad, we consider it appropriate to generally double the computed static deflection values presented above. Ultimate pile lateral load capacity can be estimated based on deflection or bending moment criteria using the above relations. Lateral load capacity can also be estimated by consideration of passive soil resistance. We recommend considering the ultimate soil resistance to lateral pile loading as the passive resistance available within a depth equal to eight times the pile width or diameter. Ultimate passive resistance can be taken as a triangular pressure distribution modeled as an equivalent fluid weight of 350 pounds per cubic foot (pcf) for non - saturated soils. Groundwater levels were approximately 8 feet below existing site grades during drilling. An ultimate passive pressure equal to 200 pcf should be assumed for saturated soils. If the required lateral capacity can not be obtained by the piles installed for the tower, batter piles may be necessary to resist the lateral forces. We recommend a maximum batter angle of 1 H:4V (Horizontal:Vertical). Batter piles lateral capacity can be assumed equal to the horizontal component of the allowable pile compressive capacity when battered. 1- uri tLLULHF ONE SEATTLE • • Cellular One 11 January 1990 PAGE . IJ i8 W -6565 Page 7 We trust this letter is sufficient for your current needs. We would be able to review your final pile design using the above parameters or to refine these estimates based on specific pile diameters and lengths, as well as to provide construction observation services, and to answer any questions you may have regarding soil design pressure. Respectfully submitted, RIZTENHOUSE -ZEMAN & ASSOCIATES, INC. Larry A. Boge, P.E. Project Engineer James S. Dransfield, Associate Enclosures: Figure 1 - Vicinity Map Figure 2 - Site and Exploration Plan Boring B -1 LAB:cao1 JAN 29 '90 15:15 FROM CELLULAR ONE SEATTLE . . . PAGE.009 .80TH 36 :r ¶T S. N1.1 CELLULAR ONE TUKWILA, WASHINGTON SITE VICINITY MAP FIGURE 1 W 0 BY DATE eras W-6565 LAB DEC 1989 N. T ASSOCIATES. RITTENHOU ift SE-ZEMAN & ZA Geotechnical & tlydrugeological Nall; Consultants 14')O 140th Avenue N. E. JAN 29 '90 15:16 FROM CELLULAR ONE SEATTLE PAGE.010 TACOMA P.S. LONGACRES WAY 0 20 40 APPROXIMATE SCALE "IN FEET LEGEND B -1 INDICATES BORING NUMBER AND IS APPROXIMATE LOCATION ELECTRONIC EQUIPMENT SHELTER $4 X X X TOWER X X S. 185th STREET CELLULAR ONE TUKWILA, WASHINGTON SITE & EXPLORATION PLAN FIGURE 2 yy.O, W --6565 BY LAB DATE DEC 1989 SCALE NOTED RITTENHOUSE -ZEMAN & ASSOCIATES. INC. Georechnical & Hrdrogevlogical Consultants 1400 140th Avenue N. E. Bellevue. 4,;-4 98005 RZA .1;1/ kile RZA "gag RI77ENHO ISE -ZEMA & ASSOC., INC. "i Geotechnical / Environmental Consultants 1-Hlat . UJ 1 1 BORING NUMBER W O W -6565 PROJECT NAME Cellujar One, Tukwila to w SOIL DESCRIPTION Ground Surface Elevation Approxlmat J a 0 O < O STANDARD PENETRATION RESISTANCE A BLOWS PER FOOT (140 ID. hammer, 30 inch drop) = 2' OD SPLIT SPOON SAMPLE JE 3' OD SHELBY SAMPLE Gd 2.5' ID RING SAMPLE B BULK SAMPLE * SAMPLE NOT RECOVERED GROUND WATER SEAL DATE WATER LEVEL AT TIME OF DRILLING ATO OBSERVATION WELL TIP LABORATORY TESTS • % WATER CONTENT NP NON PLASTIC - -- fa-- -� UOUID LIMIT L-- NATURAL WATER CONTENT /PLASTIC LIMIT 1 `' _- '"' .aOPROTL, rnntR and nrenn -h- .4r -0►. ___ _ __ i 21 31 1 5I b T T T -- - ..,.... / _,,........._.�,__..,.,. -i - - -- _ - - ...... Medium dense. moist, brown, silty SAND - Interbedded Very soft to soft, grayish brown, saturated, sandy SILT to silty CLAY -10 , -15 -20 _i _.. ___ -- _ - _ - i- — • \ J ■ I _ r...r, Medium dense to dense, black, saturated, silty SAND • (continued) -25 -30 ■-35 r 40 t_ I _ , -- — ff . _- - - - • 5 /1r - H---L1 _. 1 LL± 1 = 2' OD SPLIT SPOON SAMPLE JE 3' OD SHELBY SAMPLE Gd 2.5' ID RING SAMPLE B BULK SAMPLE * SAMPLE NOT RECOVERED GROUND WATER SEAL DATE WATER LEVEL AT TIME OF DRILLING ATO OBSERVATION WELL TIP LABORATORY TESTS • % WATER CONTENT NP NON PLASTIC - -- fa-- -� UOUID LIMIT L-- NATURAL WATER CONTENT /PLASTIC LIMIT -RZA • iv RI7TENHOIISE -ZEMA & ASSOC., INC. Ceotechnical / 1l�drogevlogicnl Cansultn,tts r'H U t. U 1 c .. BORING NUMBER B -1 w O W -5555 PROJECT NAME Cellular One, Tukailla SOIL DESCRIPTION Ground Surface Elevation Approxtmate Feet STANDARD PENETRATION RESISTANCE A. BLOWS PER FOOT (140 Ib. hammer. 30 Inch drop) Medium dense to dens?, black, saturated, silty SAND .yf • I _ -- . . _.... __ _ „_, . • 1 } ,_- j • .._ s t t a • i... 1 • ! i i ,. .. t € # t t I � • 0 � Total depth 49 feet completed 14 December 1989 o w un, u.A. SD ,cr h ' 1 I I . f 1 7 OD SPLIT SPOON SAMPLE II 3' 00 SHELBY SAMPLE 2.5' ID RING SAMPLE 13 BULK SAMPLE * SAMPLE NOT RECOVERED GROUND WATER WATER LEVEL AT TIME OF DRILLING I) SEAL DATE OBSERVATION WELL TIP LABORATORY TESTS • % WATER CONTENT NP NON PLASTIC LIQUID L}Mit NATLIPAL WATER CONTENT - PLASTIC LIMIT 60 NOT REMOVE CARBONS tr t ttomn..rn a M.,,v�c., re..d bwr,o„ Mr+riw+ra++on Nature of propose! A. Type µl New Construction ❑ Alteration • • NOTICE OF PROPOSED CONSTRUCTION OR ALTERATI 9. Class X, Permanent ❑ Temporary (Duration rrmonifts) r'.. Work Schedule Dalt, Beginning 2/1/90 End 3/1/90 3A. Name and address of individual, company, construction or alteration. Stale and Zip Coo etc. proposing the rNum0ar. Srr�it City, State and LA Code/ (arW 28't -R�19 Tet@W► ono Number I— Cellular One 101 Elliott Ave. Suite 435 Seattle, WA 98119 L W m@. address and telephone number O1 Pro _ _. _ -- - _ . - ponents representative if different than 3 above, 4. Location of Structure A. Coordinates B. Near City or Town. and State ( ro nearest ;second) Tukwila, WA 4f 27 Latitude 42 If (1) Distance to 45 within city limitmues ---21 14 '129 Jude C. Name or nearest airport. heliport.irightpark. (coFsentptaneb eRenton (1) Distance from structure to nearest point of (2) Dinxtton t0 48 within city limits PAGE UUb Fn, Au1ruaved 01.161 Nn. 2121).000 AereheutiCal Study Number NM -O99 2. Complete :ascription ot.Structure A. Include effective radiated power and assigned frequency all existing. proposed Or modified AM. FM, or TV broadcast stations uttlizinp this Structure. 8. Include size and coroguratton of power transmission lines and toc,r supporting towers in the vicinity of FAA facilities and public airports. G. Include information showing site Orientation, dimensions. and construction materials Of the proposed structure.. Structure. is a 100 foot steel self - supporting, lattice tower with a 17 foot whip antenna operating on cellular band A- 825-895 MHz with 18 GHz microwave antenna. ERP = 100 W -OE SE 45 Southcenter (if more space is rewired continue on a separgte sheet.) S. Height and Elevation .(C�te to the nearest foot) A. Eltivation of site above rrm@an sea tave! B .• merest runway Height of Structure including an `.-t . b' 1) . A; . 2.08 mi. aPPVrtenanoild and fighting (rr any) above ground. or water if so situated (2) Direction from structure to airport C. Overall h_ J - . '� Ptght above mean sea level (A . 8) e$t;npti0n 0f location of site - ._,-_- � _` N� 146 with resoect to hiQtmvrgy& streets, airporg, prominent terrain featur existing equivalent sc' mof loc showing on of sIr itr or construction highw git@ to es e g structures. etc. Attach a U.S. Geological Survey nearest anport(s). (if more space is roouirep, continuo on a separate sheet of eY this notice./ nglo step Or Site is located at 15700 Nelson Rd S in Tukwila, WA, lying to the east ofn West rValley Hwy & westerly of Longacres Race Track & Northerly of Southcenter Blvd. Notice , s ro0urred 0 y Pan 77 of the Federal Aviation Regulations t 1 C.F.R. Pen 77 ) pursuant 10 Section 1101 of tie Federal Aviation Act 011958. as amen Persons who knowingly and willingly violate the NOtiee requirements $ who for knowingly of Pall 77 are subject toe fine (criminal dPe se U.S.D. 1 fO1 e pursuant to Secuon t702(a/ of the Feder 9l Aviation Act or 1958, as amended (49 U.S. C. more than 1472(a)S50'0 for the finSl offense and nOl more I HEREBY CERTIFY that all of the above statements made by me are true, complete, and correct to the best of m knowledge. In addition, I agree to obstruction mark and /or light the structure in accordance with established marking & lighting standards if necessary. my Data 29 117 Typed Name/Tine 01 Prrs0n t n:r.y Notice 1L/29/ -89 Phi-i -Oxley, Director . of Engineering tore Form 7.16P.1 USUALLY A 12-FOOT BY 28-FOOT CONCRETE SHELTER WITH A WASHED ROCK FINISH. THIS FACILITY IS SURROUNDED BY A 10- FOOT ANTI-CLIMB CHAIN LINK FENCE. A t-i-cl-Thr-r-Ntc-)+ C • 150 FOOT THREE LEGGED TOWER WITH CONCRETE SHELTER AT BASE