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Permit PL14-0020 - JEFF PAINTER PLS - LUCKY HOME BUILDING BUFFER REDUCTION SPECIAL PERMISSION
LUCKY HOME BUILDER APN: 7360600532 WITHDRAWN/CANCELLED PL14-0020 L14-0029 September 18, 2015 City of Tukwila Jim Haggerton, Mayor Department of Community Development Jack Pace, Director Jeff Pantier, PLS Hatton, Godat, Pantier 3910 Martin Way E., Suite B Olympia, WA 98056 Subject: Lucky Home Building Buffer Reduction File #L14-0029 Dear Mr. Pantier; The City of Tukwila has not received the information supporting your request for a buffer reduction at property located off 40th Avenue South that was requested in Technical Comment letter #3 (November 10, 2014) . This request was discussed with you and your associates at a meeting in the Department of Community Development office on February 15, 2015, and requested by letter dated June 16, 2015. Per Tukwila Municipal Code Chapter 18.104.130.1, the file has been closed. I may be reached at Rebecca.fox@tukwilawa.gov or 206-431-3683 if you have questions. Sincerely, IR. ecccv Fax, Rebecca Fox Senior Planner Enc. Letter dated June 16, 2015 H:\SHORT PLATS+Trees\Lucky Home L14-0029\Close File --Sept, 2015.docx June 16, 2015 f1 City of Tukwila ila Jim Haggerton, Mayor Department of Community Development Jack Pace, Director Jeff Pantier, PLS Hatton, Godat, Pantier 3910 Martin Way E., Suite B Olympia, WA 98056 Subject: Lucky Home Building Buffer Reduction File #L14-0029 Dear Mr. Pantier; The City of Tukwila has not received the information supporting your request for a buffer reduction at property located off 40th Avenue South that was requested in Technical Comment letter #3 (November 10, 2014) . This request was discussed with you and your associates at a meeting in the Department of Community Development office on February 15, 2015. Please provide these materials at your earliest convenience. Per Tukwila Municipal Code 18.04.130.1, the application will be canceled if the requested information is not provided within 90 days of this letter. Copies of Technical Comment letters #1, #2 and #3 are enclosed. I may be reached at Rebecca.fox@tukwilawa.gov or 206-431-3683 if you have questions. Sincerely, e CCGV FOP Rebecca Fox Senior Planner Enc. Technical Comment letter #1 Technical Comment letter #2 Technical Comment letter #3 H:\SHORT PLATS+Trees\Lucky Home L14-0029\Info Deadline -June, 2015.doc C �. City of Tukwila Jisn Haggerton, Mayor Department of Community Development Jack Pace, Director TECHNICAL COMMENTS #3 November 10, 2014 Jeff Pantier PLS Hatton, Godat, Pantier 3910 Martin Way E., Suite B Olympia, WA 98506 Subject: Lucky Home Builder Buffer Reduction File #L14-0029 Dear Mr. Pantier; We appreciate the opportunity to visit the site located off 40th Avenue South in Tukwila with you recently. Seeing the property gives a better idea of the significant environmental issues that affect future development on the site. Additional materials are needed in order to proceed with the review of your request for a 50% buffer reduction. This includes both new information, and information that was requested in Stacy McGregor's technical comment letters of June 12, 2014 and June 19, 2014, but has not yet been provided by you. Given the presence of both steep, unstable slopes and wetland buffers on the site, it is necessary to consider these factors together and balance the respective impacts of each in designing access, etc. while meeting code requirements. As summarized in Stacy's letter of 6/19/14, the site contains a 100' stream buffer (Type 2 watercourse) and varying topography with Class 1 and 2 slopes. The majority of the steep slopes (Class 2+) are along the ravine on the west side of the site, and lead to the stream. There are likely Class 2 slopes on the east side of the property, and then varying slopes (Class 1 and Class 2) throughout the flatter middle areas of the site where development would occur. Wetlands may be present on the site. A Targe thickness of construction -related fill material (i.e. brick, rock and Targe pieces of concrete) is on site. The information requested below is required to further review your application. Please address the comments noted below: 1) Site survey: Please provide a survey of the site and City right of way that clearly shows all the following: 1) 50' buffer; 2) 100' buffer; 3) 10' landward from the top of the slope; 4) Class 1 slope contours—(Landslide potential is low; slope is less than 15%); 5) Class 2 slope contours—(Landslide potential is moderate; slope is between 15% and 40%, and underlain by relatively permeable soils); 6) Class 3 slope contours—(Landslide potential is high; slope is between 15% and 40% and underlain by relatively impermeable soils or by bedrock; also includes all areas sloping more than 40%.) Color/shade in each of the slope contours. Demonstrate that there are Class 1 slopes on the site and therefore can be considered for a buffer reduction. 2) Geotechnical and Wetland/Stream mitigation reports: Please provide a revised geotechnical and wetland/stream mitigation report addressing each of the items noted below: a)Access: Thank you for providing the geotech letter dated August 26, 2014. The analysis must go further to demonstrate that the route that you propose creates the minimum impact to attain the results that you desire, as compared with a route close to the slope that avoids the buffer. Per Stacy MacGregor's letter of 6/19/14, please have the geotechnical engineer and the wetland biologist work together to analyze which route to access the property would have the least impacts to both the slope and the hydrologic function. Provide and analyze cross sections for your proposed route and alternate routes. Address the following: • Compare the impacts to the stream/hydrologic impacts vs slope stability of the route that you have proposed, with the alternate route that City staff have suggested. • Why does the road need to be in the buffer? • Demonstrate which route has the fewest impacts both hydrologic and geotechnical viewpoint. Evaluating the access route will need to balance both geotechnical and hydrologic impacts to arrive at the recommended route that creates the fewest impacts. b) Wetlands: Please document clearly your conclusion that there are no wetlands on the site or adjacent to the stream. This documentation is most accurately provided through on-site work. Large-scale mapping programs, such as NW Maps and King County maps, are unlikely to locate wetlands in that small area. If you decided there are no wetlands based on the geo-tech report for borings, the conclusion needs to be documented in the Sensitive Areas report. A Wetland Report that documents onsite investigation is preferred. c)Conceptual Mitigation Plan— • Revise the mitigation/buffer enhancement plan to reflect the buffer width of 50ft vs. the 40ft width of the original report. Jeff Pantier's drawings from the site visit included a 50 foot buffer, but the mitigation plan, including numbers of trees to be planted, costs for mitigation, etc., is detailed for a 40ft buffer enhancement. Rf • Describe THOROUGHLY how invasive plants will be removed from the slope and new plants planted. Describe the specific methods that will be used and the locations. Maintenance of the area must also be addressed. • Provide details on how monitoring and maintenance can be ensured for the 5 year period (and the trees for the life of the project) at a private residence. By what mechanism will you ensure that future owners commit to not removing trees or vegetation from the buffer, and also not mowing? Assurance is H:\SHORT PLATS+Trees\Lucky Home L14-0029\L14-0029--TechnicalComments#3.doc 11/10/2014 2 required that there will still be site access for maintenance/monitoring purposes after the houses are sold. d)Geo-Technical Review: • Provide a geo-tech review of the buffer enhancement plan showing that the slope will not be destabilized by the invasive removal and planting work to be done. This is per 18.45.100. • The original geotech report shows one house, and one garage. Revise the geotechnical report to show the current proposal of two homes and garages. e)Concrete/Fill: • Provide additional information about the amount and type of concrete fill material on the site. Describe how this material will be removed from the site, and the methods that will be used so as to minimize impacts to the site. 3) Trees— • Provide a tree survey showing location, type and size of the trees in the 50' reduced buffer that are proposed for removal and those that will remain. • Provide a count of all of those that are over 4inches in diameter, including those that will be kept and those that will be cut. Please note that tree replacement requirements of TMC 18.54 apply, therefore location and type of replacement trees should also be noted. I am including Stacy MacGregor's technical comment letters on 6/12/14 and 6/19/14 for your convenience, and have marked the information that still needs to be provided. Please contact me at 206-431-3683 or via email at Rebecca.fox@tukwilawa.gov if you have questions. Sincerely, Rebecca Fox Senior Planner Enc. Rf H:\SHORT PLATS+Trees\Lucky Home L14-00291,14-0029--TechnicalComments#3.doc 11/10/2014 3 INSIGHT GEOLOGIC, INC. August 26, 2014 Lucky Home Builder, LLC c/o Hatton Godat Pantier 3910 Martin Way E, Suite B Olympia, Washington 98506 Letter Report Altemative Roadway Design Parcel No. 7360600532 Tukwilla, Washington Project No. 625-001-02 INTRODUCTION Insight Geologic is pleased to provide our letter report regarding the proposed roadway realignment as suggested by the City of Tukwilla. The property having tax parcel number 7360600532 is located west of 42nd Avenue South in Tukwilla, Washington as shown in the attached Vicinity Map, Figure 1. The proposed project involves constructing two, single family residences on a pre-existing fill pad. Access to the homes will be by way of a common driveway off of 42nd Avenue South. Development of the parcel is constrained by a steep (>15%) slope on the south which extends from the fill pad down to a seasonal creek and a steep slope (>15%) on the east which extends upwards approximately 30 feet to developed properties. Additionally, a stream buffer extends eastward from the seasonal stream onto the building pad. The driveway alignment proposed by the developer was selected to minimize encroachment into the stream buffer and avoid the steep slope buffer, while at the same time minimize the amount of excavation and soil removal to obtain appropriate street grades. The proposed road alignment and buffer areas are shown in the Site Plan, Figure 2. We understand that the City of Tukwilla has suggested re -aligning the driveway to avoid all buffers which places the roadway along the east property line. The location of this alignment will require significant excavation of soil along the toe of the eastem slope as well as the construction of a concrete retaining wall to retain the stiff silts of the eastern hillside. We estimate that this alignment will require the removal and disposal of approximately 785 cubic yards of soil in order to construct the roadway and the retaining wall. The retaining wall will be on the order of 10 feet high and of concrete cantilever construction (Figure 3). Typical costs for a wall of this type are on the order of $125 per square foot of face. Construction costs for this wall alone would be on the order of $240,000 assuming 160 linear feet of 12 foot high concrete retaining wall (1,920 square feet). 1 •3 U r o " yam+'-' 1015 EAST 4TH AVENUE, OLYMPIA, WASHINGTON 98506 PHONE: 360.754.2128 FAX: 360.754.9299 Lucky Home Builders, LLC Roadway Design August 26, 2014 Clearly, the preferred alternative road alignment into the property is the initial alternative proposed by Hatton Godat Pantier. Although the road alignment does encroach slightly into the slope buffer, the design is far Tess environmentally intrusive by requiring Tess excavation and grading and eliminates the need for an expensive and sightly retaining wall to support deep road cuts into the toe of a steep slope. We trust the City of Tukwilla will consider the impacts and cost of their requested realignment for this two party driveway and allow the original alignment as proposed by Hatton Godat Pantier as the better alternative for this small project. We trust this letter meets your current requirments. Please contact us if you have questions regarding our opinion and conclusion as stated above. We appreciate the opportunity to be of continued service to you on this project. Respectfully Submitted, INSIGHT GEOLOGIC, INC. William E. Halbert L.HG., L.E.G. Principal Attachments FILE No. 625-001-02 2 EOLOGIC,, INC. % iti., 1 mi4.:..:A •. 4 Naii, l' .......„----) kli ...- .0 i, 41, Nib : ., .i''.i, I A a' "ONO iffittid, lu ' Vlsi ..... 4:. • M • • * . . • a,„, '••• MINI iiiiiii al IN tet+{ nal -I WWI •ti IMNII i''rii ill'ill._ I id r r pi ii.-,.., '( {�''P \ Course L,. gril;?..* Footrr:c1P, 4 's ..,...„:„. .. 1 i ,• ~ Black nom akin las. f. �i� 1\ \�� kill . ... - _ 1 . MI a 3' ; , k EV:tillt4t4 q . : d': �1 , 1111111MINIIM NIIIIMItlifiBIN11111 . 1 f J . . : L. f` r n ..., , . Jiai - 4 • '1. a �� . .11 , . L ik.:' S: U • � % ��lilli witirmks,, 1p : . il ..,... • . .1 J -: 11! • - �dt.i , , 11 - `• Source: Maptech,Inc. tc'1997 BURIEN, WASHINGTON 7.5 MINUTE QUADRANGLE Year 1983 LUCKY HOME BUILDERS SCALE 1:24000 TUKWILA, WASHINGTON �'`, Figure 1 INSIGHT GEOLOGIC, INC. Vicinity Map FIGURES 0 12' RETAINING WALL OVER EXCAVATION I FOR WALL CONSTRUCTION 1 2.5 5 SCALE: 1" = 5' 20' ROADWAY LUCKY HOME BUILDERS TUKWILA, WASHINGTON INSIGHT GEOLOGIC, INC. Figure 3 Retaining Wall Cross Section CITY . . IUK*ILA ss RE • DED ACCESS ' . TE••••••, IONE OF SLOPE EXCEEDING 15X CITY OF TUK%ILA RECOMMENDED ACCESS ROUTE .V/%////0/ // %/ PLANNED 2—STORY RESIDENCE %// \� l /// /?%SsY//////i • • ZONE OF SLOPE • EXCEEDING 15Z • • 1:13— • • • • 0 30 60 SCALE 1' = 30' ORDINARY HIGH WATER STREAM CENTERLINE LEGEND: '� •' ZONE OF SLOPE EXCEEDING 15X APPROXIMATE PROPERTY BOUNDARY LUCKY HOME BUILDERS TUKWILA, WASHINGTON Figure 2 Site Plan I� City of Tukwila Jim Haggerton, Mayor Department of Community Development TECHNICAL COMMENTS #2 June 19, 2014 Jeff Painter, PLS Hatton, Godat, Painter 3910 Martin Way E, Suite B Olympia, WA 98506 Subject: Lucky Home Builder Buffer Reduction L14-0029 Hi Jeff, Jack Pace, Director Thank you for working on a site redesign that minimizes the impacts to the buffer. It is a difficult site and our code does not offer an obvious solution for the many issues affecting access and the buffer. As I told you on the phone, I am leaving employment with the City next week so I wanted to lay out the issues and options so my successor has as much information as I do on this project. The site contains a 100' stream buffer (Type 2 watercourse) and varying topography with Class 1 and 2 slopes. The majority of the steep slopes (Class 2+) are along the ravine at the west side of the site and lead to the stream. There likely are Class 2 slopes along the east side of the property and then varying slopes (Class 1 and Class 2) throughout the flatter middle areas of the site where development will occur. Access to the site requires improvements to the unimproved right-of-way. Buffer reductions in the ROW area are subject to TMC 18.45.070 B6. This application will need to include an analysis that the impacts to the sensitive areas and buffers is kept to the absolute minimum with the minimum alteration of natural conditions and no adverse effect to the hydrological quality of the watercourse or buffer. Impacts shall be mitigated according to the standards of TMC 18.45. On the private property, the code does not clearly allow for a buffer reduction in area where there is a class 2 slope. The alternative access to the east of the buffer requires cutting into a very steep slope and likely creating a significant retaining wall. It is prudent for the City to consider which of the alternatives (buffer access or steep slope access) has the least negative impact on the stream, water quality, erosion, and habitat. Any alternative process, for example a reasonable use exception, would have to ask this same question and the same analysis would be needed to inform our decision. Please be aware that any buffer reduction is subject to 18.45.080 F). Please have the geotechnical engineer and the wetland biologist work together to analyze what route to access the site would create the least impacts. The requirements for sensitive areas studies under TMC 18.45.040 and geotechnical reports under TMC 18.45.120 & 130 should serve as a guideline for this analysis. I would like to also suggest that you work with Tukwila Fire and Public Works to ensure that your proposal will meet their needs and the concessions you desire can be granted. Don Tomaso in Fire, 206-971-8723 and Dave McPherson in Public Works at 431-2448 can assist you with this. SM Page 1 of 2 06/18/2014 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax: 206-431-3665 Rebecca Fox will be assigned to this project after I leave. If you wish to speak to me through Wednesday, June 25th at (206) 431-7166 or Rebecca can be reached at 206-431-3683 or Rebecca.Fox@tukwialwa.gov. Sincerely, Stacy MacGregor Assistant Planner cc. L14 -0020 --Lucky Home Builders Short Plat SM H:\Sample Letters & Masters\20140618 L14-0029 #2.doc Page 2 of 2 06/18/2014 June 12, 2014 City of Tukwila Department of Community Development Jim Haggerton, Mayor Jack Pace, Director NOTICE OF COMPLETE APPLICATION & PRELIMINARY TECHNICAL COMMENTS Jeff Painter, PLS Hatton, Godat, Painter 3910 Martin Way E, Suite B Olympia, WA 98506 Subject: Lucky Home Builder Buffer Reduction L 14-0029 Dear Mr. Painter: Your application for a Lucky Home Builder Buffer Reduction is considered complete on May 29, 2007 for the purposes of meeting state mandated time requirements. 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. This notice of complete application applies only to the permits identified above. It is your responsibility to apply for and obtain all necessary permits issued by other agencies. Our staff environmentalist has reviewed your application and has some comments that need to be addressed prior to continuing your review. Please revise your application in consideration of the following comments: Southgate Creek Fish Distribution Survey: 1. Southgate Creek discharges into the Duwamish River (Green/Duwamish system), not the Cedar. 2. Tukwila's Sensitive Areas Code for classification of watercourses follows the DNR stream typing system and is not specific to salmonids. Instead, it applies to all fish either present or able to use the watercourse. The report did not mention if other species were found in the traps or in seining. Given that Coho were found in the stream segment adjacent to the property, this means that fish are using the stream, and therefore that the correct classification of the watercourse is Type 2(F). Further, while it is true that Coho are released into Southgate Creek, the releases occur well downstream from both of the presumed "Total Fish Barriers" closest to this reach of the stream. Therefore, the fish are obviously making it upstream to use this reach of the stream. Thus the required watercourse buffer is 100 feet. A buffer reduction up to 50% may still be possible, while allowing development. Wetland and Watercourse Sensitive Area Study Report SM H:\20140612 PL14-0020 NOC & 1st comments.doc Page 1 of 2 06/12/2014 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax: 206-431-3665 1. We agree that the buffer is degraded (particularly due to the extensive ivy infestation which could damage trees if not controlled) and qualifies for a buffer reduction in accordance with TMC 18.45.100.E. 2. In the site layout, the applicant has assumed that the full 50% buffer reduction will be allowed and that it will be allowed across the entire length of the property. This should not be assumed and the applicant needs to justify why the project needs this full 50% reduction. It appears that the homes and the road can be located to reduce or eliminate a need for a buffer reduction ---explain if and why this is not the case. Geotechnical Report and Soil Investigation Services Report 1. The Soil Investigation Services Report discusses a garage located in the area of the proposed house and a setback from the top of the slope of ten feet. The Site Plan in the report shows a house and detached garage. The short plat shows two houses and no detached garage. 2. A memorandum dated 1/15/2014 from William Halbert to Jeff Panier correctly notes that buffer reductions are only allowed in areas where slopes are less than 15%. The letter goes on to state that the slope angle is "in the order of 15%". Show all slopes 15% or greater on the short plat map. Steep slopes in the right of way also need to be shown and the same standards apply. 3. The report notes that soil excavation revealed rocks and concrete. A previous report for this site concluded that mitigation planting in the buffer would not be possible due to the rocks/debris in the ground and on the steep slope that forms the stream buffer. Please address this concern. 4. The code and the sensitive areas report notes that "where a buffer has a variable topography that includes Class 1 slopes a buffer reduction may be allowed if the proposed reduction is in the area with the Class 1 slopes, and a 10 foot planted setback from the top of the slope is maintained" Provide drawings that show this is the case. Further, native vegetation and significant trees shall be maintained in the buffer. Show the trees in the reduced buffer that are proposed for removal and explain why development can't be located to preserve the trees. Mitigation Plan: 1. The mitigation plan has not been reviewed at this time until the above items are addressed. 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) 431-7166. S cerely, Stacy MacGregor Assistant Planner cc. L14-0020—Lucky Home Builders Short Plat SM H:\20140612 PL14-0020 NOC & 1st comments.doc Page 2 of 2 06/12/2014 IcAj— W-1'1 -q)u 0-vt st4x c(}, s SeArt -t-v (A, w e \OA -olio 1/1Anqk-t, riAnA)1/2_, i\ruek vvot ItyriA)/Kt) \Q-Atre i! e._ .14 - (ivy q -r t '� ° Tria-PI Gl,__1 Vbinfteirtektit. APR 29 ?tti,. (;(/iuuii,,l411 T OEVELUP'MENT LUCKY HOME BUILDERS CITY OF TUKWILA, KING COUNTY, WASHINGTON WETLAND AND WATERCOURSE SENSITIVE AREA STUDY REPORT Prepared For: Jeff Pantier, PLS Sr. Vice President Hatton Godat Pantier 3910 Martin Way E, Suite B Olympia, WA 98506 Prepared By: Curtis Wambach, M.S. Senior Biologist and Principal EnviroVector 4333 30th Avenue SE Lacey, WA 98503 26 March 2014 WETLAND AND WATERCOURSE SENSITIVE AREA STUDY REPORT Prepared For: Jeff Pantier, PLS Sr. Vice President Hatton Godat Pantier 3910 Martin Way E, Suite B Olympia, WA 98506 Prepared By: Curtis Wambach, M.S., Senior Biologist and Principal EnviroVector Lacey, WA 98503 (360) 790-1559 Phone www.envirovector.com 26 March 2014 / i Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report EXECUTIVE SUMMARY Project Name: Lucky Home Builders Site Location: The 0.82 -acre subject property (7360600532) located in the City of Tukwila, King County, Washington in Section 12, Township 23 North, Range 04, Willamette Meridian. Project Staff: Curtis Wambach, M.S., Senior Biologist and Principal Site Evaluation: 24 June 2013 & March 2014 Site Description: The subject property is undeveloped and unused (Appendix A). A red alder (Alnus rubra) and big -leaf maple (Acer macrophyllum) forest occurs on the subject property. The edge of a ravine is located on the western edge of the subject property. A stream occurs in the ravine west of the subject property. The central and eastern portions of the subject property (the proposed building area) are relatively flat. Invasive weeds dominate the riparian area. Slopes are stable. Regulatory Considerations: The subject stream is classified as a Type Np under the City of Tukwila Code Chapter 18.45.100(A) ---Watercourse Designations, Ratings and Buffers: Watercourse Ratings, given that the watercourse is perennial and is not used by salmonid fish. Under City of Tukwila code Chapter 18.45.100(C) ---Watercourse Designations, Ratings and Buffers: Watercourse Buffer Widths, Type Np watercourses require an 80 -foot standard buffer width. Under City of Tukwila code Chapter 18.45.100(C) ---Watercourse Designations, Ratings and Buffers: Watercourse Buffer Widths, all commercial and industrial buildings shall be set back 15 feet and all other development shall be set back 10 feet from the sensitive area buffer's edge. Under City of Tukwila Code Chapter 18.45.100(E) ---Watercourse Designations, Ratings and Buffers: Variation of Standard Watercourse Buffer width, the standard buffer width of Chapter 18.45.100(C) may be decreased up to 50 percent with enhancement. Proposed Project: The proposed project consists of a short subdivision dividing one undeveloped parcel into two parcels each containing a proposed 2 -story 2,000 sf residence, totaling 2 residences. An access road would be improved roughly in the same location as the existing access road. However, the proposed access road would be located further from the riparian area than the existing access road. The existing access road (40th Avenue North) would be vacated and removed. The 80 -foot standard buffer would be reduced to 40 feet with enhancement. Mitigation: The mitigation plan (buffer enhancement plan) consists of eliminating invasive weeds and planting native conifers and other native plants in the riparian area. EnviroVector Page i 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 1.0 INTRODUCTION At the request of the landowner, a wetland and watercourse sensitive area study was performed on the subject property and within 300 feet of the subject property. This corresponding report has been prepared to identify potential wetlands, streams, buffers, and critical areas on the subject property, to evaluate potential impacts that may occur as a result of the proposed land use action, and to mitigate potential unavoidable impacts. This report analyzes potential impacts and proposes measures to off -set those impacts. 2.0 SITE LOCATION The 0.82 -acre subject property (7360600532) located in the City of Tukwila, King County, Washington in Section 12, Township 23 North, Range 04, Willamette Meridian (Figure 1; Appendix A). 3.0 SITE DESCRIPTION The subject property is undeveloped and unused (Appendix A). A red alder (Alnus rubra) and big -leaf maple (Acer macrophyllum) forest occurs on the subject property. An off-site ravine extends along the western edge of the subject property. A stream flows within the ravine. The central and eastern portions of the subject property and the proposed building area are relatively flat. Dominant vegetation in the proposed building site primarily consists of European lawn grasses and invasive weeds, such as English Ivy (Hedera helix), Himalayan blackberry (Rubus discolor), English laurel (Prunus laurocerasus), English holly (Ilex aquifolium), European mountain ash (Sorbus aucuparia), and English hawthorn (Crataegus laevigata). City -owned land and a park are located west of the subject property. Single-family residential development is located east of the subject property. Commercial development is located south of the subject property. Tukwila International Boulevard is located west of the subject property and neighboring parkland. 4.0 METHODOLOGY 4.1 Background Review Determination Guidelines. EnviroVector based its identification and delineation upon the 1987 Army Corps of Engineers (COE) manual and the regional specificity on the 1997 Washington Department of Ecology (DOE) manual. Generally, as outlined in both the COE and DOE manuals, wetlands are distinguished from other landforms by three criteria: 1) hydrophytic vegetation, 2) hydric soils, and 3) wetland hydrology. EnviroVector Page 1 26 March 2014 / \ i Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Background Review. Background information on possible wetlands was reviewed prior to field investigations and included the following: • National Wetlands Inventory (NWI) Map, USFWS Interactive Map • City of Tukwila GIS database • United States Hydric Soils List (U.S. Department of Agriculture 1991) • Washington State Hydric Soils List (Iowa State University, 1995) • EnviroVector. 16 March 2014. Lucky Home Builders Southgate Creek Fish Distribution Study. 4.2 Field Investigation The field study was performed on 24 June 2013. A fish study has been performed during March 2014 on the reach of Southgate Creek from the western property line to its confluence with the Cedar River. A fish study report has been prepared by EnviroVector separately of this report. The routine on-site determination method was used to identify potential wetlands using the procedures outlined in the Corps of Engineers Wetland Delineation Manual (Environmental Laboratory, 1987). Under the City of Tukwila Code, wetlands are defined as areas that are inundated or saturated by ground or surface water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs, and similar areas. Wetlands do not include those artificial wetlands intentionally created from nonwetland sites, including, but not limited to, irrigation and drainage ditches, grass -lined swales, canals, detention facilities, wastewater treatment facilities, farm ponds, and landscape amenities, or those wetlands created after July 1, 1990, that were unintentionally created as a result of the construction of a road, street, or highway. Wetlands may include those artificial wetlands intentionally created from nonwetland areas created to mitigate conversion of wetlands." Plant species were identified according to the taxonomy in Flora of the Pacific Northwest (Hitchcock and Cronquist, 1973), and the wetland status of plant species was assigned according to the National List of Plant Species that Occur in Wetlands: Northwest, published by the U.S. Fish and Wildlife Service (Reed, 1988). A supplement to the wetland plant list (Reed, 1993) and an updated list (Reed, 1998) were also reviewed. Soils were excavated to 18 inches or more below the surface within test pits to evaluate soil characteristics and hydrological conditions throughout the property. Soil chroma (color) is evaluated using the Munsell Color Chart (Munsell Color, 1988). EnviroVector Page 2 26 March 2014 s Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report The COE (Environmental Laboratory, 1987) and DOE (DOE, 1997) manuals describe a wetland rating system for plants. Each plant species is assigned a probability of occurrence within wetlands, which is referred to as its wetland status. The wetland rating system is as follows: • obligate (OBL), • facultative wetland (FACW), • facultative (FAC), • facultative upland (FACU) • upland (UPL) (Probability >99% occur in wetlands) (Probability 67% to 99% occur in wetlands) (Probability 34% to 66% occur in wetlands) (Probability 1% to 33% occur in wetlands) (Probability <1% occur in wetlands) In general, under the 1987 Federal methodology, more than 50 percent of the predominant plant species within a test plot must be rated FAC or wetter (i.e., FACW, OBL) to satisfy the wetland criteria for hydrophytic vegetation. Dominant species are those that have a percent cover greater or equal to 20 percent within the test plot. Only dominant plant species were considered in the data analysis. If wetland hydrology, including pooling, ponding, and soil saturation, is not be clearly evident, hydrological conditions may be observed through surface or soil indicators. Indicators of hydrological conditions include oxidized root channels, drainage patterns, drift lines, sediment deposition, watermarks, historic records, visual observation of saturated soils, and visual observation of inundation. 5.0 STUDY RESULTS 5.1 Review of Existing Information NRCS Soil Survey for City of Tukwila No data is available from the NRCS on this area. National Wetland Inventory No wetlands are identified by the National Wetland Inventory (NWI) map to occur on the subject property (Appendix B). No wetlands are identified within 1,000 feet of the subject property. King County IMAP No wetlands are identified on the subject property or within 300 feet of the subject property by the King County IMAP (Appendix C). DNR Stream Typing Map The DNR Stream Typing Database identifies an unnamed stream located immediately west of the subject property (Appendix D). The reach of this stream located at the subject property is identified as a Type N, no salmonid fish. Immediately downstream (north) of the subject property the stream is identified as a Type F, containing salmonid fish. This stream is a small tributary of the Cedar (Duwamish) River. EnviroVector Page 3 26 March 2014 \ ♦ \ Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 5.2 Field Results Wetlands No wetlands have been identified on the subject property or within 300 feet of the subject property. Streams One stream named Southgate Creek, has been identified west of the subject property. The actual location of the stream is similar to that depicted on the DNR stream database (Appendix D). The stream is located within a ravine of variable slopes. A 24 -inch culvert extends approximately 200 linear feet across 40th Avenue South north of the subject property (Appendix A, Photos 1-3). During the site evaluation, only a 0.5 inch deep and 5 inch wide flow was observed at the culvert. The culvert appears to be a complete fish barrier. Winter flows entrain fast moving water through this tube at a high velocity, creating a velocity barrier to fish access. Summer flows restrict fish access through no or low water capacity. During the winter, water jets out of the culvert outlet at a high velocity. This fast moving water is only a few inches in depth within the culvert even during winter flows. Sand and gravels form the stream bed immediately upstream of the culvert. Between the Culvert and the subject property, bricks and rip -rap form the stream bed and banks (Appendix A, Photos 5-7). No significant fish habitat occurs in this area. West of the subject property, the stream channel is variable in that portions extend through narrow rocky channels, through gravelly pools, muddy meanders, and steep drops in elevation (Appendix A, Photos 9 & 10). Upland vegetation dominates plant species identified in the riparian area. Invasive weeds, such as English laurel, English ivy, English hawthorn, English holly, and Himalayan blackberry, are common in the riparian area. Appendix A, Photos 8-10 demonstrate the domination of the invasive weeds English laurel and English ivy right up to the ordinary high water mark (OHWM). Dominant riparian plants identified in the riparian area (sloped stream buffer) of the creek include: Native Plants • Osoberry (Oemlaria cerasiformis) • Beaked hazelnut (Corylus cornuta) • Douglas fir (Pseudotsuga menziesii) • Red alder (Alnus rubra) • Large -leaf avens (Geum macrophyllum) • Lady fern (Athyrium filix-femina) • Bracken fern (Pteridium aquilinum) • Trillium (Trillium ovatum) • Water leaf (Hydrophyllum tenuipes) • Big -leaf maple (Acer macrophyllum) • Sword fern (Polystichum munitum) • Common horsetail (Equisetum arvense) • Western red cedar (Thuja plicata) Invasive Weeds •, Reed canarygrass (Phalaris arundinacea) • English Ivy (Hedera helix) • Himalayan blackberry (Rubus discolor) • English laurel (Prunus laurocerasus) • English holly (Ilex aquifolium) • European mountain ash (Sorbus aucuparia) • Creeping buttercup (Ranunculus repens) • Robert's geranium (Geranium robertianum) • English hawthorn (Crataegus laevigata) EnviroVector Page 4 26 March 2014 l 1 i Lucky Horne Builders Revised Wetland and Watercourse Sensitive Areas Study Report Fish Distribution The EnviroVector (16 March 2014) fish distribution study identified Juvenile Coho salmon upstream of known fish barriers and of fish barriers discovered during the study. It is known that Coho salmon can bypass some obstacles that other salmon cannot. However, these Juvenile Coho have been identified upstream of partial and complete natural and human - created fish barriers identified by the City of Tukwila 2013 Surface Water Comprehensive Plan. The culvert at 40th Avenue South downstream of the subject property appears to be the greatest obstacle to fish passage on the subject reach of Southgate Creek. Yet, several juvenile Coho salmon were identified above this complete fish barrier during the EnviroVector fish study. The best explanation of how these Juvenile Coho are found upstream of partial and complete natural and human created fish barriers is explained in the 2013 Surface Water Comprehensive Plan Page 2-14, which reports that Juvenile Coho are regularly released to Southgate Creek by a nearby homeowner. It is likely that the Juvenile Coho identified upstream of total fish barriers were implanted by this nearby homeowner. Thereby, fish implanted above natural and human created fish barriers should not affect the stream typing. As such, the reach of Southgate Creek west of the subject property has been rated as a Type Np stream. Under the City of Tukwila Code, an 80 -foot standard buffer is proposed. The Building Area The proposed building area contains young red alder and an understory of Himalayan blackberry, trailing blackberry (Rubus ursinus), sword fern, nodding brome (Bromus anomalus), English laurel, English ivy, some vine maple (Acer circinatum) and Big -leaf maple). The majority of plant species that occur in this area are invasive weeds. Slopes The building area and existing access road are relatively flat. The land slopes down from the adjacent property to the east onto the subject property. A ravine of variable slopes occurs on the western edge of the subject property. A geotech report prepared by Insight Geologic, Inc. dated 26 September 2013 determined that the slopes associated with this ravine are stable. Insight Geologic, Inc. recommended a minimum setback from top of slope to buildings and roadways of 10 -feet. Easements A 30 -foot easement from the western property line was vacated onsite. This easement extends 30 feet east and west of the western property line. A 20 -foot wide easement occurs on the eastern property line. EnviroVector Page 5 26 March 2014 / Lucky Horne Builders Revised Wetland and Watercourse Sensitive Areas Study Report 6.0 Regulatory Considerations Wetlands No wetlands were identified on the subject property or adjacent to the subject property where buffers would extend on to the site. Streams The reach of Southgate Creek west of the subject property has been classified as a Type Np under the City of Tukwila Code Chapter 18.45.100(A) ---Watercourse Designations, Ratings and Buffers: Watercourse Ratings, given that the watercourse is perennial and is not naturally used by salmonid fish. Under City of Tukwila code Chapter 18.45.100(C) --- Watercourse Designations, Ratings and Buffers: Watercourse Buffer Widths, Type Np watercourses require an 80 -foot standard buffer width. Under City of Tukwila code Chapter 18.45.100(C) ---Watercourse Designations, Ratings and Buffers: Watercourse Buffer Widths, all commercial and industrial buildings shall be set back 15 feet and all other development shall be set back 10 feet from the sensitive area buffer's edge. The building setbacks shall be measured from the foundation to the buffer's edge. Building plans shall also identify a 20 -foot area beyond the buffer setback within which the impacts of development will be reviewed. The Director may waive setback requirements when a site plan demonstrates there will be no adverse impacts to the buffer from construction or occasional maintenance activities. Fish implanted above natural and human -created fish barriers should not affect the stream typing. As such, the reach of Southgate Creek west of the subject property has been rated as a Type Np stream. Under the City of Tukwila Code, an 80 -foot standard buffer is proposed. Table 1: City of Tukwila Reiulatory Summar Stream Type Buffer Buffer Reduction with Enhancement Buffer Enhancement Offsite toweeds, west Np 80' 40' Eliminate invasive plant conifers to shade out invasive weeds Buffer Reduction Under City of Tukwila Code Chapter 18.45.100(E) ---Watercourse Designations, Ratings and Buffers: Variation of Standard Watercourse Buffer width, the standard buffer width of Chapter 18.45.100(C) may be decreased up to 50 percent with enhancement pursuant to conditions under that section, provided that the buffer is significantly degraded due to conditions that include the presence of significant amount of invasive vegetation that impairs buffer function and provided the remaining buffer is enhanced in accordance with an approved buffer enhancement plan prepared by a qualified professional. EnviroVector Page 6 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Where a buffer has a 'variable' topography that includes Class I slopes on the landward portion of the buffer, buffer reduction may be allowed if the proposed reduction is in the area with the Class I slopes, and a 10 foot planted setback from the top of the slope is maintained. Further, a geotechnical review of the proposed buffer enhancement plan must determine that the buffer enhancement can be implemented without destabilizing the slope. The approved buffer width shall not result in greater than a 50% reduction in width. Any buffer reduction proposal must demonstrate to the satisfaction of the Director that it will not result in direct, indirect or long-term adverse impacts to watercourses, and that the buffer is vegetated and includes an on-site buffer enhancement plan prepared by a qualified professional, to retain existing native vegetation and install additional native vegetation in order to improve the buffer function. Mitigation All adverse impacts resulting from a development proposal or alteration shall be mitigated in accordance with an approved mitigation plan as described below: 1. Mitigation plans shall be completed for any proposals that include buffer impacts and shall be prepared as part of a sensitive area study. The plan must show how water quality, treatment, erosion control, pollution reduction, wildlife and fish habitat, and general watercourse quality would be improved. 2. The scope and content of a mitigation plan shall be decided on a case-by-case basis taking into account the degree of impact and extent of mitigation measures needed. As the impacts to the watercourse or its buffer increase, the mitigation plan to offset these impacts will increase in extent and complexity. 3. The components of a complete mitigation plan are as follows: a. Baseline Information b. Goals and Objectives c. Performance Standards d. Detailed Construction Pian e. Monitoring and Maintenance f. Contingency Plan g. Performance Security Slopes A geotech report prepared by Insight Geologic, Inc. dated 26 September 2013 determined that the slopes associated with this ravine are stable. Insight Geologic, Inc. recommended a minimum setback from top of slope to buildings and roadways of 10 -feet. EnviroVector Page 7 26 March 2014 i Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 7.0 PROPOSED PROJECT The proposed project consists of a short subdivision dividing one undeveloped parcel into two parcels each containing a proposed 2 -story 2,000 sf residence, totaling 2 residences (Figure 3). An access road would be improved roughly in the same location as the existing access road. However, the proposed access road would be located further from the riparian area than the existing access road. The existing access road (40th Avenue North) would be vacated and removed. Utilities will include power, municipal sewer, and municipal water. A 60 -foot right-of-way located on the western edge of the property (30 -feet located on the subject property) was previously vacated. 7.1 Project Impacts Project impacts include the reduction of the standard 80 -foot stream buffer to 40 feet. Justification for stream buffer reduction includes: • Invasive weeds that dominate the outer 40 feet of the stream buffer degrades habitat, thereby, provides no significant habitat valuate. This area is slated for development. • The on-site portion of the remaining 40 -foot stream buffer will be enhanced from its existing degraded condition through the elimination of invasive weeds and the installation of conifers and understory vegetation. Weed removal is not expected to destabilize slopes because native herbs, shrubs, and trees will remain. Large woody debris will be installed to improve habitat value and to aid in slope stability. • The area above top of slope is functionally excluded from riparian habitat on the slopes of the ravine. No vegetation will be removed below the top of slope other than invasive weeds. Large woody debris will be installed to aid in slope stability. • A geotech report prepared by Insight Geologic, Inc. dated 26 September 2013 determined that the slopes associated with this ravine are stable. The report recommends a 10 -foot setback from top of slope. No native vegetation is proposed for slopes within the ravine or in the 10 -foot setback at the tops of slope. No other impacts are expected. 7.2 Conceptual Mitigation Plan A mitigation plan has been prepared to off -set potential impacts of the proposed land use (Figure 3; Table 1). EnviroVector Page 8 26 March 2014 Lucky Home Builders / \ Revised Revised Wetland and Watercourse Sensitive Areas Study Report Table 1: Summary of Mitigation Plan. Mitigation Plan Mitigation Objectives Attribute Buffer Enhancement 9,712 sf Eliminate Invasive Weeds • Reed canarygrass (Phalaris arundinacea) • English Ivy (Hedera helix) Himalayan blackberry (Rubus discolor) •English laurel (Prunus laurocerasus) • •English holly (Ilex aquifolium) • European mountain ash (Sorbus aucuparia) • English hawthorn (Crataegus laevigata) Removing invasive weeds will improve riparian habitat value, which will allow native vegetation to recolonize and flourish. The rooting of native vegetation will aid in slope stabilization. Native will provide resources for native wildlife species, including aquatic native insects that provide a food source for fish downstream. Install Conifers & Understory Vegetation • Western red cedar (Thuja plicata) • Western Hemlock (Tsuga heterophylla) Shade out invasive weeds allowing native vegetation to flourish. Rooting of conifers and native vegetation will aid in slope stabilization. Conifers acidify the soils discouraging the germination of invasive weeds. Conifers improve riparian habitat value. Shading of the stream stabilizes water temperatures. Conifers also provide nutrients for aquatic insects and for fish habitat downstream. Installing understory vegetation will fill the gaps left from invasive weed removal. Install Large Woody Debris • Logs and branches larger than 5 -inches in diameter and 15 feet in length • Root Wads (>3) Large woody debris will provide habitat for wildlife species, enrich the soils for native vegetation to glow, and stabilize slopes. The installation of large woody debris will improve riparian habitat value. Large woody debris provides nutrients for aquatic insects and for fish habitat downstream. Install Habitat Features • 2 bird houses • 2 bat boxes The installation of bird houses and bat boxes will encourage the utilization of enhanced habitat by wildlife species and control insect populations. EnviroVector Page 9 26 March 2014 r Lucky Horne Builders Revised Wetland and Watercourse Sensitive Areas Study Report Goal and Objectives Goal: Improve habitat value in 9,712 sf of riparian stream buffer located on the subject property through buffer enhancement. Objectives: • Remove invasive weeds through mechanical means and herbicide application within the 9,712 sf of riparian stream buffer to allow for the growth of native vegetation. • Install shade tolerant conifers at a density of 200 trees per acre to shade out invasive weeds, improve habitat value, and to acidify the soils discouraging the germination of invasive weeds. • After invasive weeds are removed, install understory vegetation at a lower than standard density to compensate for existing native vegetation. • Install large woody debris in the form of logs and branches larger than 5 - inches in diameter and 15 feet in length and more than 3 root wads to provide habitat for wildlife species, enrich the soils for native vegetation to glow, provide stream nutrients, and to aid in slope stabilization. • Installation 2 bird houses and 2 bat boxes to encourage the utilization of enhanced habitat by wildlife species and to control insect populations. A planting schedule, monitoring and maintenance plan, and an estimated cost of mitigation toward the performance bond are provided below. Remove Exotic Invasive weeds. Weeds will be removed in the planting areas through a combination of mechanical means and herbicide application. Himalayan blackberry will be removed by hand, preserving existing native vegetation. Weed removal protocol will be as follows: • Eliminate invasive weed species within 9,712 sf of riparian buffer area on the subject property. Species to be removed include: o Reed canarygrass (Phalaris arundinacea) o English Ivy (Hedera helix) o Himalayan blackberry (Rubus discolor) o English laurel (Prunus laurocerasus) o English holly (Ilex aquifolium) o European mountain ash (Sorbus aucuparia) o English hawthorn (Crataegus laevigata) • The cut -stump treatment will be employed, beginning in late spring. After the cane is cut, immediately drench (paint or spray) the cut surface with 1-2% glyphosphate. With a lower concentration of herbicide the individual plant is able to continue functioning long enough to translocate the chemical to the roots and kill the root crowns for which new growth could sprout. Several treatments may be necessary. Herbicide will be applied in compliance with State regulations regarding licensed applicators. No herbicide will be applied in water. • Cover areas of high blackberry density with cardboard and %-inch wood chips to discourage new growth within enhanced buffer area. On sloped areas use industry standard geofabric staked firmly into the ground. EnviroVector Page 10 26 March 2014 \ F 1 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report • Mechanically remove Himalayan blackberry stalks by hand in the enhanced buffer area. City approved herbicides will be applied as necessary. Existing native vegetation will be saved in this area. 7.3 Planting Plan The planting plan calls for enhancing 9,712 sf of degraded riparian habitat through the elimination of invasive weeds, the installation of large woody debris, installation of habitat features, and the planting of native conifer species and understory vegetation to enhance habitat value (Table 2). Table 2. Plantini Areas Planting Area Area Estimated Plant Costs SF Acres Enhance Riparian Buffer 9,712 0.18 $936 Planting details are summarized in Table 3. The cost for plant stock covering the stream buffer enhancement will cost an estimated $936 (Table 2). Typically in mitigation areas that plant on bare ground, conifers are planted at 400 plants per acre. However, existing trees and shrubs occur in the riparian area. Thereby, the density of conifer installation will be reduced to 100 plants per acre. Western red cedar (Thuja plicata) and western hemlock (Tsuga heterophylla) are both shade tolerant conifer trees that are proposed for planting under a canopy of existing red alder (Alnus rubra) and some big -leaf maple (Acer macrophyllum). These shade tolerant conifers shade out invasive weeds and acidify the soils, discouraging the germination of invasive weeds. Planting Instructions • A small amount of fertilizer will be added to the planting cavity prior to installing the plant. • Geofabric mats will be placed around installed plants for weed suppression at a radius indicated below. o 2 -foot radius for herbaceous plants o 3 -foot radius for shrubs o 6 -foot radius for conifers • Understory native plants will be installed in areas of weed removal, rather than areas containing existing native vegetation. • Weeds will be thoroughly removed and herbicide applied to remaining stems prior to planting native vegetation. • Plants will be installed in the spring or fall. • Irrigation may be necessary for the first year after installation, especially if plants are installed in the spring. EnviroVector Page 11 26 March 2014 Lucky Home Builders f Revised Wetland and Watercourse Sensitive Areas Study Report Table 3. Planting Schedule Planting Plan Plants Area Density Plants Trees Shrubs Herbs 9,712 9,712 9,712 0.0046 0.0184 0.0344 45 178 334 Trees Plant species Number Container Cost/plant Cost FACU FAC Western Hemlock Western Red cedar Tsuga heterophyla Thuja plicata 23 22 1 -gal 1 -gal $3.00 $3.00 $69.00 $66.00 Total 45 $135.00 Shrubs Plant species Number Container FACU FAC+ FACU . FAC FAC FAC- FACU Osoberry Salmonberry red elderberry Clustered rose Nootka rose Vine Maple Snowberry Oemleria cerasiformis Rubus stoloniferia Sambucus racemosa Rosa pisocarpa Rosa nutkana Acer circinatum Symphoricarpos albus 26 26 26 25 25 25 25 1 -gal 1 -gal 1 -gal 1 -gal 1 -gal 1 -gal 1 -gal $3.00 $3.00 $3.00 $3.00 $3.00 $3.00 $3.00 $78.00 $78.00 $78.00 $75.00 $75.00 $75.00 $75.00 Total 178 $534.00 Herbs Plant species Number Container FAC FAC+ FACU Salal Deer fern Sword fern Gaultheria shallop Blechnum spicant Polystichum munitum 112 111 111 Bareroot Bareroot Bareroot $0.80 $0.80 $0.80 $89.60 $88.80 $88.80 Total 334 $267.20 Planting Density #/Acre #/sf Trees Shrubs Herbs 200 800 1500 0.0046 0.0184 0.0344 Trees Shrubs Herbs Est. cost per plant # Plants Total Cost $3.00 $3.00 $0.80 45 178 334 $ 133.77 $ 535.10 $ 267.55 (Total Total 1 557 1 $ 936.42 Cost of Plants 1 1 $ 936.42 EnviroVector Page 12 26 March 2014 / Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 8.0 MONITORING PLAN 8.1 Monitoring Methodology The monitoring program will be conducted for a period of five years, as required under Tukwila Code Chapter 18.45.210(B) ---Assurance Device. A baseline analysis will be conducted at the end of the construction phase. This information will be used as a baseline to compare subsequent monitoring events. Field visits will be completed once per year for the first and second growing season and twice every year thereafter to a total of five (5) years: * At the time of construction completion. * Early in the growing season of the first year after construction. * Early in the growing season of the second year after construction. * Beginning and end of the third, fourth, and fifth growing season. Monitoring will evaluate plant growth and establishment, condition of habitat quality, and wildlife usage in the enhancement area. If enhancement objectives are met at an earlier date, the applicant may request to end the monitoring phase earlier. 8.2 Vegetation Permanent vegetation sampling points or transects will be established at the riparian buffer enhancement site to incorporate the installed plants. The same monitoring point will be re- visited throughout the monitoring period. Vegetation will be recorded on the basis of relative percent cover. General plant health, percent survival, and plant species occurrence (including volunteer species) will also be recorded. Photo -points will be established from which photographs will be taken throughout the monitoring period. These photographs will document general appearance and progress in plant community establishment in the buffer enhancement area. Review of the photos over time will provide a semi -quantitative representation of success of the buffer enhancement plan. Monitoring and photo -point locations will be recorded to keep a record of enhancement success. 8.3 Wildlife Birds, mammals, reptiles, amphibians, and invertebrates, which are readily observable (either by direct or indirect means), will be identified and recorded in the enhancement area. Direct observations would include actual sightings, while indirect observations include tracks, scat, nests, song, or other indicative signs. EnviroVector Page 13 26 March 2014 r � J i Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 8.4 Success Criteria • Success of plant establishment will be evaluated on the basis of percent survival. Planting success will be based on 100% survival rate following each monitoring event. Mitigation success will also depend on less than 20% invasive weeds following each monitoring event. 8.5 Performance Standards Vegetation • 100% survival rate of installed plants following each monitoring event. • Less than 20% invasive weeds will occur in the mitigation area following each monitoring event. o Invasive weeds include: • Reed canarygrass (Phalaris arundinacea) • English Ivy (Hedera helix) • Himalayan blackberry (Rubus discolor) • English laurel (Prunus laurocerasus) • English holly (Ilex aquifolium) • European mountain ash (Sorbus aucuparia) • English hawthorn (Crataegus laevigata) 8.6 Maintenance (M) and Contingency (C) Established performance standards for the project will be compared to the monitoring results in order to judge the success of the buffer enhancement plan. Contingency measures will include the items listed below and will be implemented if these performance standards are not met. Maintenance and remedial action on the site will be implemented immediately upon completion of the monitoring event (unless otherwise specifically indicated below). Planting Plan & Weed Removal Replace dead plants with the same species or a substitute species that meets the goals and objectives of the plan. (M & C) If the performance standard for vegetation is not satisfied following each monitoring period, re -plant individual plants after reason for failure has been identified and resolved (e.g., moisture regime, poor plant stock, disease, shade/sun conditions, wildlife damage, etc.). (M & C) If more than 20% aerial cover of invasive weeds occurs in the mitigation area following each monitoring event, these weeds will be removed manually or by City of Tukwila approved herbicide. Any herbicide will be applied by a licensed applicator. EnviroVector Page 14 26 March 2014 !` \ / / Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 9.0 COST ESTIMATE & PERFORMANCE BOND Performance Bond A financial guarantee on a form acceptable to the City of Tukwila is required for the duration of the monitoring period, and the guarantee plus any accrued interest will be released by the City of Tukwila when the required mitigation and monitoring are completed. To determine the amount of the financial guarantee, an estimate had been prepared detailing the work to be accomplished and the cost thereof. The estimate is based on current costs. City of Tukwila requires a financial guarantee at 125 percent of the total cost estimate of the mitigation project to allow for inflation and administration expenses should the City of. Tukwila have to complete the work. Table 6. Performance Bond Estimate Item Estimate cost Plants $936 Planting crew $1,000 Monitoring $2,500 Contingency $200 Total $4,636 Performance Bond @ 125% $5,795 10.0 CONCLUSIONS AND RECOMMENDATIONS No wetlands have been identified within 300 feet of the subject property. One Type Np stream has been identified west of the subject property. Under the City of Tukwila Code, an 80 -foot standard buffer is proposed. The stream buffer (riparian area) is dominated by invasive weeds. Buffer reduction with enhancement is proposed. The proposal reduces the 80 -foot standard buffer to 40 feet with enhancement. Enhancement will include the elimination of invasive weeds and the planting of conifers to shade out weeds, encourage the growth of native vegetation, and to aid in slope stabilization. Buffer enhancement is recommended to improve habitat value in the riparian area and to aid in slope stabilization. The elimination of invasive weeds will allow for the growth of native vegetation. The planting of shade -tolerant conifers under the canopy of red alder will act to shade out invasive weeds and to aid in slope stabilization. Conifers acidify the soils to discourage the growth of invasive weeds and to enhance the growth of native vegetation. Understory native vegetation will be installed to replace invasive weeds. EnviroVector Page 15 26 March 2014 \ i Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 11.0 REFERENCES Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Department of the Interior. FWSOBS-70/31. Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1, US Army Engineer Waterways Experiment Station, Vicksburg, Miss. EnviroVector. 16 March 2014. Lucky Home Builders Southgate Creek Fish Distribution Study. Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press. 730 pp. Iowa State University. 1995. Hydric Soils of Washington State. U.S. Department of Agriculture, Natural Resources Conservation Service. December 5. Munsell Color. 1988. Munsell Soil Color Charts. Kollmorgen Instruments Corp., Baltimore, Maryland. Reed, P.B. Jr. 1988. National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USF&WS Biol. Report 88. Reed, P.B. Jr. 1993. Supplement to: National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USF&WS Biol. Report 88. Reed, P.B. Jr. 1998. National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USF&WS Update. U.S. Department of Agriculture, Soil Conservation Service. June, 1991. Hydric Soils of the United States. U.S. Department of Agriculture, Soil Conservation Service. 1973. City of Tukwila Area Soil Survey. U.S. Fish and Wildlife Service. 1973. National Wetlands Inventory Map, Issaquah Quadrangle. Washington State Department of Ecology. 1997. Washington State Wetland Identification and Delineation Manual. March. Washington State Department of Ecology. 2004. . Washington State Wetland Rating System for Western Washington. Ecology Publication # 04-06-025. August. Washington State Department of Natural Resources. 1994. Endangered, Threatened and Sensitive Vascular Plants of Washington. EnviroVector Page 16 26 March 2014 / \ / Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Washington State Department of Fish and Wildlife. 1999. Species of concern: State candidate species. WDFW. Olympia, WA. Washington State Department of Health. 2002. Glendon Biofilters; Recommended standards and guidance for performance, application, design, and operation & maintenance. Office of Environmental Health and Safety. Olympia, WA. WRP. 1993. Installing Monitoring Wells/Piezometers in Wetlands. WRP Technical Note HY-IA-3.1, August 1993. EnviroVector Page 17 26 March 2014 / \ Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Figures EnviroVector Appendix 26 March 2014 tl Rninler Golf °e lui•A11rI r:nungt}' v tr.P t r y tea, p s 116, t 6 ,• `. ✓ 1 t thein N 015 Rik N .5 Sti '} k 1 f, ` 1k , 1� 'r� l •\'.'•k F `` • i 1 .\ I' r iN,� P1 ;r17 ` r SA-3 rr /rte' S, (/ /k.: til, ff i4 ` l fir+ S-2 �' ; : 1 - r ',N: • ! . 1 , ; 10i �i 1i ' ;'.* 094 s /r'\ 1 fid N-- Su roert \- • •., b� t 4.4 e ct y S' l .. -.._.. i tit i ,I ��111 , ,_� t� . ' i S-: ', � .Easeen 1 17. ror . • i m� ao 4Q'�''. S- -10'® \. . S'} - 115- k :., i 1 I 7 . Stream Type Np Standard Stream Buffer Stream Buffer40'with Enhancement of Slope Setback 10' '/ Existing Access Road of Reduced Buffer 80' to 40' Figure 2 LuckyScale. Home Builders Site Evaluation 1" = 70' ---- — — --- — 80' — Reduced — Top Slope R,,' +k1. VO 4 ^+ .:J . G. 1±y ✓`.e. _ curtis@envirovector.com www.envirovector.com 360-790-1559 i 0 70 , 26 March 2014 Area , P \rOZy i /FDS \ F. � \ OXY 2`, i> 11 i • • I , / 0 0 1 Y I � • — — — \\ I 1 1 moo\ I t• 4 • 1 3 Lot 1 0 VACATED 40m MORE warm (FV7EERY DAIS SREEf) / ..• :iY• •i �i • i • ® CFNiD11RE or wpmROAD PER SUM'/EFFIENCE E 5 OlY PER A? NFRE ® Disown FOR ROWPPURPOSESER A NCI 31179:84. 311790.OOOW MEW PRIMED BY EW NO her i �iii•� I:'.. f�j'•;.�' :" :: F .:. ii • • • '.':.' ..'...'.:':. "..:.. • .:...1•V i• ?., • viii Ig . rA'.:'.'.'.•.: i ti' V I •' I I REFERENCIA: N =MY REFERENCE p. m ERF -OWED R.Wf-OF-IRA? PIX FMEY R6fRm70E 4 ® 40• wow SWAM EVFFER - • /7 ye STN six." BUFFER •i�P�.. • •/ ..... five :'::.:• ' 18'I ii �• 18' I' %— ® COINHIRC RAGA= RUR -(FRAY ® PLUME)OF LOTSI NO. AAD WIRY LESF1Oliiar IME ff]61f • 00 ::: �:...� • iiY• • •••••moi••? • •�• • ii I• ':::•::.'. 0' I _ f • 18' /////////S:YY//////A 10' / I �D• 4•fO'l tlie�t•• I ii»ii> Ir 5s �' ; ®--J\ --Lot 2 ii :;•: .;:1:P`: i j -.110' ;.: l 1, 115' 8p i I /1 ® 17 — Stream Type Np ---- 80' Standard Stream Buffer Figure 3 color" — — Reduced Stream Buffer 40' with Enhancement EUV 0Lucky �!y Scale: 1" = 50' • — — Top of Slope Home Builders I 1 curtis@envirovector.com www.envirovector.com 360-790-1559 --- •'• •'• - Slope Setback 10' Area of Enhanced Stream Buffer 9,712 sf Existing Access Road ,f Proposed Road Site Plan & Conceptual Mitigation 50' 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Appendix A Photos EnviroVector Appendix 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 15 inch culvert under 42" Ave South 2) Trash rack between culvert and 42 Ave S � a . t p Y"n of streann off Sit ust •� � ! st ups#ream of cult' ulvert #hat extends under 40 Ave South 4 Lowr,r ort�o 5 ream off-site, pink flag on OHVVMM 6) Stream east of subject property EnviroVector Appendix 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report 7 Bricks on the banks of the c eek westf the site 8 En of �x'wn d u al on banks of creek east of site. ink f'a a t M sh Laurel & English iv at Engle g y OH W M, pink flag 10) English Laure 11) Building area onsite 2) Bt.iildin g area onsite EnviroVector Appendix 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Appendix B Nationa Wetland inventory Map NWI EnviroVector Appendix 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report Subject Property Wettand Types Estuarine and Marine Deepwater Estuarine and MarineWetland Freshwater Emergent Wetland Freshwater Forested/'ShrubWetlan Freshwater Pond ke her Inc EnviroVector Appendix 26 March 2014 72°2f 58:2 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report King County Imap County Wetland map. EnviroVector Appendix 26 March 2014 Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report i MAP The inferrnation included on Ws map has !aeon compred by Kig Coen/ alae from a variety pl sources and 4 subpc1 to crepe without notice. Knp County makes no represenanoru If wsrtanneo, express 0, 1$ed. ss A etc -Katy, completeness, Meknes*, Of rtgnta 6 the use of such inforn affen. Tho 24000,102 fa not 0400004 brt use as a emyey pmd,tr Ks‘g Cmeaty sheil cot be kab+e tar aro goner*, special, indInni, 020I0,0incidental, or eenseque0 001 Comore Including, WI not kneed to, 4 st.revenues or lest onsets resWdsg firm the use 0r mt0LLse of the mtama0an contained an et h map. Any sate of Vs map at lnformadon an Ws map Is prohibited Ctes.pl Di; unseen permission of King County. pate; 0123/2013 .ourc0' King County OAP -Ht02m apple Information 241p200400 0000021 G2S/lU4P EnviroVector Appendix 26 March 2014 / �l i Lucky Home Builders Revised Wetland and Watercourse Sensitive Areas Study Report EnviroVector Appendix 26 March 2014 r i Lucky Horne Builders Revised Wetland and Watercourse Sensitive Areas Study Report APPENDIX D DNR STREAM TYPING MAP EnviroVector Appendix 26 March 2014 Jo;oanaJinu3 171-0Z 43JeW 9Z r � sJaplmg auiog tilon7 Revised Wetland and Watercourse Sensitive Areas Study Report • I t \ INSIGHT GEOLOGIC, INC. Soil Investigation Services Parcel No. 7360600532 Prepared For: Lucky Honze Builders, LLC INSIGHT �GEOLOGIC, INC. September 26, 2013 Lucky Home Builder, LLC c/o Hatton Godat Pantier 3910 Martin Way E, Suite B Olympia, Washington 98506 Report Soil Investigation Services Parcel No. 7360600532 Tukwilla, Washington Project No. 625-001-01 INTRODUCTION Insight Geologic is pleased to present our report of soil investigation services for the property described as tax parcel number 7360600532 in Tukwilla, Washington. The property is located west of 42nd Avenue South in Tukwilla and is shown relative to surrounding physical features in the Vicinity Map, Figure 1. At present, the site is undeveloped and contains moderate to steep fill slopes leading down to a seasonal creek. The proposed use of the property is for two single family residences. Our services were requested to evaluate the slopes in accordance with the City of Tukwilla's Critical Areas Ordinance. SCOPE OF SERVICES The objective of our services was to explore the subsurface site conditions as a basis for evaluating long-term stability of the slope and establishing an appropriate setback for the proposed residence. Our specific scope of services included the following tasks: 1. Excavate a series of exploratory test pits and hand -auger borings on the property to evaluate the subsurface soil and groundwater conditions. 2. Collect representative soil samples from the test pits and borings to assess soil type and soil properties. 3. Provide a written report of our findings and providing recommendations with regard to slope stability and an appropriate building setback. FINDINGS We conducted our initial investigation at the site on June 25, 2013 by drilling six hand auger borings at various locations on the property to evaluate subsurface soil conditions. Most of the borings were unable to be advanced beyond a depth of about 2 feet below ground surface due to the presence of large concrete debris in the subsurface. 1015 EAST 4TH AVENUE, OLYMPIA, WASHINGTON 98506 PHONE: 360.754.2128 FAX: 360.754.9299 Parcel No. 7360600532 Soil Investigation Services September 26, 2013 We received authorization to modify our original investigation approach and remobilized to the site on July 9, 2013 with a small, track -mounted excavator to adequately explore the subsurface condtions at the site. We excavated a total of four test pits at the approximate locations as shown in the Site Plan, Figure 2. The test pits were excavated to depths of between approximately 8 and 9.5 feet below ground surface. Our exploratory test pits encountered fill consisting of fine to coarse sand containing concrete, rock and brick at all four locations. The fill thickness varied from about 3 feet in test pit TP -2, to over 9.5 feet in TP -3. Groundwater was encountered only in TP -2 at a depth of 9.5 feet. Logs of the exploratory test pits are contained in Attachment A. The slope on the west side of the property, leading down to the seasonal creek, appears to be about _.--65.percent at its steepest with a corresponding slope height of about 20 feet. It is about 50 percent in the.lrea_o the rop o d)garage, where the height of the slope decreases to about 10 feet. We recommend a minimum setback from the top of slope in these areas to buildings and roadways of at least 10 feet, which corresponds to a 2H:1V slope from the toe of theslope at its steepest. The fill contains a large quantity of oversize material including cobbles and boulders, brick, and large pieces of concrete, which are apparent on the face of the slope. It is our opinion that these materials within the fill increase the internal strength of the material and reduce the likelihood of failure of the slope. We recommend that the proposed residential structures be founded on spread footings, bearing on a minimum 1 -foot thick overexcavation and replacement with structural fill consisting of imported, well - graded sand and gravel or crushed rock with a maximum particle size of 3 inches and less than 5 percent passing a U.S. Standard No. 200 sieve based on the minus 3/ -inch fraction. Organic matter, debris or other deleterious material should not be present. In our experience, "gravel borrow" as described in Section 9-03.14(1) of the 2008 WSDOT Standard Specifications is typically a suitable source for select granular fill during periods of wet weather, provided that the percent passing a U.S. Standard No. 200 sieve is less than 5 percent based on the minus 3/4 -inch fraction.. The structural fill zone should extend to a horizontal distance equal to the overexcavation depth on each side of the footing. The actual overexcavation depth will vary, depending on the conditions encountered. A bearing capacity of 1,500 pounds per square foot may be assumed for footing design. We recommend that an experienced geotechnical owner -representative observe the foundation surfaces before overexcavation, and before placing structural fill in overexcavations. This representative should confirm that adequate bearing surfaces have been prepared and that the soil conditions are as anticipated. Unsuitable foundation bearing soils should be recompacted or removed and replaced with compacted structural fill, as recommended by the geotechnical engineer. CONCLUSIONS We have provided our services in general accordance with our proposal. Our subsurface investigation encountered a large thickness of construction -related fill material containing brick, rock, and large pieces of concrete at all four of the locations explored. Based on the materials encountered in our explorations and the locations of the proposed structures on the property, it is FILE No. 625-001-01 2 � . ,. 'ham --'r• - « 12(� Parcel No. 7360600532 Soil Investigation Services September 26, 2013 our opinion that the materials are relatively stable and that the building setbacks from the top of the slope are adequate to reduce the potential for life -safety in the event of slope failure. We recommend that all runoff from roof downspouts and impervious surfaces be contained and directed to the base of the slope within tightlines for discharge to reduce the potential for erosion and possible sloughing of the slope. We appreciate the opportunity to be of service to you on this project. Please contact us if you have questions or require additional information. Respectfully Submitted, INSIGHT GEOLOGIC, INC. William E. Halbert, L.E.G., L.HG. Principal Attachments William E. Halbert' FILE No. 625-001-01 3 n'�!s1�!•.. 'Rig FIGURES r. • Park\•.. • o', , - \\ , . \,.1 R(rcrton gdi . ' 11181� [ 4.- 4,„. ' r. \ ,4� 1 Li r17 't , iseade View • „ • fS Goff .�` I 9 Sch _ — if• / Course /ft y 104 ----'-:::\\ I. ,.••• a • ,,:. , Footbr dge . -',.,* \ P �,. 1 G `d t, �ii� EHalit v . js �, ..` � :•,,'• �r .� t: Black ,b ..�� -��'&' ; Rga Cem Or •1tf 11 - leTErl- 1 J 1• t ` 191 "Fret `•.r+ �f :� ' ...^ 1 ' �klI� 1) 1 , s7d7bfl. of VERB' HEV I , ' �a • ` It 1. \ ' r-' `0. e f ' '` _ .. � . �a ;eft t• ,11 � •"I Ali:= .u. ..� � \�. .11' i e I t • '.T�7 ilft I r P.lJ4 4 .' 'IlieTbomdyks. .r 1 r_, - r':, �'):il f•l', �•.l Source: Maptech, SCALE: -[. -� .. l �� Ott. A Inc. (c) 1997 BURIEN, WASHINGTON 75 MINUTE QUADRANGLE Year 1983 1:24000 LUCKY HOME BUILDERS TUKWILA, WASHINGTON Figure 1 INSIGHT GEOLOGIC, INC. \-- "°— Vicinity Map 0 25 50 SCALE: 1" = 50' .. .4 TP -4 TP -1 Z4///// % Trs(P2 ��- PROPOSED RESIDENCE / l PROPOSED GARAGE Source: Hatton Godat Pantier LEGEND: APPROXIMATE TEST PIT LOCATION APPROXIMATE PROJECT BOUNDARY LUCKY HOME BUILDERS TUKWILA, WASHINGTON r-� INSIGHT GEOLOGIC, INC. Figure 2 Site Plan ATTACHMENT A EXPLORATION LOGS r ,1117 rM** ly. SOIL CLASSIFICATION CHART MAJOR DIVISIONS SYMBOLS GROUP NAME COARSE GRAINED SOILS MORE THAN 50% RETAINED ON NO.200 SIEVE GRAVEL AND GRAVELLY SOILS MORE THAN 50% OF COARSE RE-4,It D ONNO. 4SIEVE CLEAN GRAVEL <5=6 FINES - ,- 0 : ^ GW WELL -GRADED GRAVEL, FINE TO COARSE GRAVEL ^ i4, GP POORLY GRADED GRAVEL 1,Ir_ GRAVEL WITH FINES ,12%FINES I ' I • ' 1 '_ GM SILTY GRAVEL ,, GC CLAYEY GRAVEL SAND AND SANDY SOILS MORE THAN 50% OF COARSE TICN PASSNG NO.4 SIEVE CLEAN SAND <5% FINES SW WELL -GRADED SAND, FINE TO COARSE SAND - ' SP POORLY GRADED SAND SAND WITH FINES ,12%FINESfJ •. I ! E I '' SM SILTY SAND SC CLAYEY SAND FINE GRAINED SOILS MORE THAN 50% PASSING 1O. 200 SIEVE SILTS AND CLAYS LI°JDLIAIR LESS THAN 50 INORGANIC ML SILT / / jj < CL CLAY ORGANIC 1 I I I OL ORGANIC SILT, ORGANIC CLAY LTS ANDS CLAYS DOuouMIT SO ORMORE INORGANIC j MH SILT OF HIGH PLASTICITY, ELASTIC SILT ;< J/, ;_ CH CLAYOFHIGHPLASTICITY, FAT CLAY ORGANIC �� 14:-/ /�/ f, OH ORGANIC CLAY, ORGANIC SILT HIGHLY ORGANIC SOILS ' 't %> `- PT PEAT 70 60 50 40 1- U y 30 20 10 A -LINE CH M i8 011 CL EL - ML M L&OL 0 10 20 30 40 50 60 LIQUID LIMIT 70 80 90 100 SOIL MOISTURE MODIFIERS: DRY - ABSENCE OF MOISTURE, DUSTY, DRY TO THE TOUCH MOIST - DAMP, BUT NO VISIBLE WATER WET - VISIBLE FREE WATER OR SATURATED, USUALLY SOIL IS OBTAINED BELOW WATER TABLE ADDITIONAL MATERIAL SYMBOLS SYMBOLS TYPICAL DESCRIPTION CC CEMENT GONCRtIE AC ASPHALT CONCRETE t 113•CRUSHED !i;!\\�,..i CR ROCKI QUARRY SPALLS •/- .,,E TS TOPSOIL/SOD/DUFF GROUNDWATER EXPLORATION SYMBOLS MEASURED GROUNDWATER LEVEL IN EXPLORATION, — WELL, OR PIEZOMETER 1 GROUNDWATER OBSERVED AT TIME OF EXPLORATION ▪ PERCHED WATER OBSERVED AT TIME OF EXPLORATION MEASURED FREE PRODUCT IN WELL OR PIEZOMETER STRATIGRAPHIC CONTACT APPROXIMATE CONTACT BETWEEN SOIL STRATA OR GEOLOGIC UNIT APPROXIMATE LOCATION OF SOIL STRATA CHANGE WITHIN GEOLOGIC SOIL UNIT - APPROXIMATE GRADUAL CHANGE BETWEEN SOIL STRATA OR GEOLOGIC SOIL UNIT APPROXIMATE GRADUAL CHANGE OF SOIL STRATA WITHIN GEOLOGIC SOIL UNIT LABORATORY / FIELD TEST CLASSIFICATIONS %F PERECENT FINES AL ATTERBERG LIMITS CA CHEMICAL ANALYSIS CP LABORATORY COMPACTION TEST CS CONSOLIDATION TEST DS DIRECT SHEAR HA HYDROMETER ANALYSIS MC MOISTURE CONTENT MD MOISTURE CONTENT AND DRY DENSITY OC ORGANIC COMPOUND PM PERMEABILITY OR HYDRAULIC CONDUCTIVITY PP POCKET PENETROMETER SA SIEVE ANALYSIS TX TRIAXIAL COMPRESSION UC UNCONFINED COMPRESSION VS VANE SHEAR SAMPLER SYMBOLS ® 2.4 INCH I.D. SPLIT BARREL ® SHELBY TUBE DIRECT -PUSH M PISTON E. STANDARD PENETRATION TEST ® BULK OR GRAB SHEEN CLASSIFICATIONS NS NO VISIBLE SHEEN SS SLIGHT SHEEN MS MODERATE SHEEN HS HEAVY SHEEN NT NOT TESTED INSIGHT GEOLOGIC. INC. Key to Exploration Logs 1im[ DEPTH REMARKS AND U.S.C.S. LITHOLOGY SOIL DESCRIPTION LABORATORY TEST RESULTS 0 -Brown silty fine to coarse sand with fine to coarse gravel, loose, moist (fill) 1 — 2 —. Grades to light gray fine to coarse sand with gravel, concrete, brick and rock _• cobbles, very dense, moist (fill) 3 — 4 -co — - d_ co 5 — 6 — 7 — 8 - Groundwater not encountered Large concrete block encountered at 8 feet 9 — 10 LEGEND: PROJECT NO.: 625-001-01 DATE: JULY 9, 2013 TOTAL DEPTH: 8 FEET DRILLING EQUIPMENT: MINI EXCAVATOR LOGGED BY: KEVIN VANDEHEY LUCKY HOME BUILDERS TUKWILA, WASHINGTON INSIGHT GEOLOGIC, INC. -1 Exploration Log TP -1 TP -2 DEPTH REMARKS AND U.S.C.S. LITHOLOGY SOIL DESCRIPTION LABORATORY DERESULTS 1 2 3 4 5 6 7- 8 9 10 LEGEND: PROJECT DATE: TOTAL DRILLING LOGGED - - - - — cn a co .. ., . Brown silty fine to coarse sand with fine to coarse gravel and occasional concrete and brick, loose, moist (fill) - — — - - _ — — - J If 1 Light brown silt with fine to coarse sand and occasional fine to coarse gravel, soft, moist to wet Groundwater encountered at 9.5 feet NO.: 625-001-01 JULY 9, 2013 DEPTH: 10 FEET EQUIPMENT: MINI EXCAVATOR BY: KEVIN VANDEHEY LUCKY HOME BUILDERS TUKWILA, WASHINGTON INSIGHT GEOLOGIC. INC. \-..,..:;'-`41 Exploration Log TP -2 / \ TP -3 REMARKS AND DEPTH U.S.C.S. LITHOLOGY SOIL DESCRIPTION LABORATORY (FT) TEST RESULTS 0Brown - silty fine to coarse sand with fine to coarse gravel, brick and rock boulders, occasional plastic and metal debris, loose to very dense, moist (fill) 1 — 2 — 3 — 4 - - 2 - (0 o_ co 5 • 6 —' 7 — 8 — 9 - Groundwater not encountered Large concrete block encountered at 9 feet 10 LEGEND: PROJECT NO.: 625-001-01 DATE: JULY 9, 2013 TOTAL DEPTH: 9 FEET DRILLING EQUIPMENT: MINI EXCAVATOR LOGGED BY: KEVIN VANDEHEY LUCKY HOME BUILDERS TUKWILA, WASHINGTON INSIGHT GEOLOGIC, INC. ''--- 1 Exploration Log TP -3 / / \ / TP -4 DEPTH U.S.C.S. LITHOLOGY SOIL DESCRIPTION (FT)TEST REMARKS AND LABORATORY RESULTS 0 1 2 3 4 5 6 7 8 9 10 LEGEND: PROJECT DATE: TOTAL DRILLING LOGGED — — — - — - — — — 2 d rn • Brown silty fine to coarse sand with fine to coarse gravel, brick and rock boulders, loose to very dense, moist (fill) - - — Groundwater not encountered Large concrete block encountered at 8 feet NO.: 625-001-01 JULY 9, 2013 DEPTH: 8 FEET EQUIPMENT: MINI EXCAVATOR BY: KEVIN VANDEHEY LUCKY HOME BUILDERS TUKWILA, WASHINGTON INSIGHT GEOLOGIC. INC. 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Mary A Security Hvar.lrn mninlalt ale nu allowed aVurd 401018 Ie,y at 341.,1e4/ p.nungermp. Ott). tht+e In e:3Vllv,[e wish 11.., Codd 844x4 Reada4ma.D.ibitAl tai but nut IV.,ty 303346335doytat agents vPan 016933,6.0 fredevice. nd 40011 4,1AItodIed ,3,, apc,Min J<h uv to 12eateedmom matirroen der NUL dr3 nrmdennn:.n. elon e4iee 0.440)3343394 repv,e.v9. pdoe torn? Me, ort the pdmry 1iMlrt ,oe 007 a3e3, Mid, kmted:ut.. d portable propene askm•y be sorted ine vehide 4.5.1m to trop A01010,0n notF,. ...LIN tool rata d l 610, .t.ed 11130(4.n, pnend nes we,3e enc ant) .1141.0 m 1 lode 100 pnnA tank rr Daily Leave Edmonds 535.,^ 11:10 6:20• 1255 7010 12:40 7:35 1:40 11:50 225 9:40 3:15 10:30 355 Leave Kingston 2-x5„.. 10:25 5:35• 11:15 0:25 1153 7:05 1250 755 10 8:50 230 9:40 3:10 4:43 9:30131 5:25 10:25 6:15 11:10,x:- 7:00 11:45 7:40 12:55• 8:30 9:03 4:00 4:40 530 6:10 7:00 7:45 8:20 9:10.: 9:40 1030"` 11:05 1210, v. • vend, Arxgn twrmetn.,4,. prep, ;r nM•+,g„are Chinn,. 0 153.48, 31,159..e<a1860 103 65. movie e, °,1in atl... %e r+lkn d 9vd ire Ple.nen andinga ,d , ,,,,.1 v et( you telt de hold, Vehicle. ,mnbel mnA to 4t• Isnot. ,018¢18 OU,er "Mainers. V.Ndee dnet mutt be halted cg vdvle 489 v<8801 is utderr 5.Y. Do not resbarl vmn ex tool d,tved by a veto,embe,. C' vo000.;liznot v,8008\',5f : ed bet.. board, Me /.010,44810 mutt he ve 5N. No Imo., .ning nI 251.•0dthe tnity to levy terming c,uity rams+awnn ret a St an 084048,08•40•4418•8900504•0105 1.5.14e aeweily at.ex,b,q. Americans with Disabiliciei Art ®549 ,.eet,Irina:and ...KI Mleten. Innen,. tits via e < .,Lie 5.Mat Tr'ovie 3v dwate rf you tae Rearheu.Mee 5.r 4,10 tollI n,x..itr maybe obtained InVern.. lxms by olrn9 205. 515 346, Doily Leave M3kilteo 5:05.' 10:00 5:35•,• 10:30 6:05 11:00 6:30000 11:30 7:00 12:00 730151 12:30 A:00 1:00 030 1:30 0:03 2:00 0:110 2:30 Leave Clinton 4:40`10, 930 5.10'10 75:00 3:30 10:30 653.:.- 1150 3310 11:30¢ 7'000+1 1250 7:aa 12:30 0:00 150 11:30 130 3:00 3:30 4:00 430 550 5:30 6:00 6:30 7:00 735 230 3:00 330 450 4:30 550 5:30 650 630 t lr� q x.II Lato 141136,156e 010. 13. 2015 thl0uyh 1.10. 14 2014 Daily Leave Port Townsend 633 11:00 355 6:45 0510 12:30 3:15 8:30 0:30 2:15 Leave Coupeville 7:15 11:45 4:30 7:30 7:80 1:15 6:00 9:15 10:15 3:00 '.'R� You� tnn adra•3+ "" .� vel Mie itlk adNetp):v!.; pyvre ' I p1 h M 90 1 9.3 0,. 6441, '... p w 1oe4,n nam otr:lnemedd. Mdonsina Early Fall 5c11751:1e .n.21. 20I, throu6lt 007. 14 2011 8:25 Doily 9:OD Leave Part Townsend 1050 030 11:40 145 0:00 10:20'.• 0:00 3:45 3:13 10:0O'.9900 11:00 8:451+:x12:30 4:150` 15:00 930 1:15 5:15 135 10:102:156,.6:45 7:30 8:00 830 855 9:30 930 10:30 11:30 12.30 ..n505994 .5 883. ..8.}.r, nryt + satu4en rnrrcm rev ,t A Leave CoupeVille 7:15 1145 3:30 9:15 835 1230 4:30 10:40'8, 9:50•...0 1:15 590,, 10:15 2:00 6:00 11:00 3:00..`.7:30 [L51. 421 1. r�ar'y{ZS an -x"+1„33 • gip_7.7. iar,0°°34" Monday through Friday Leave Faunt,eroy 425 • 5:25 3:054 355 5:13 10:20 3:35• 10:20 5.55 11:00. 4:20. 11:40 7:01 13:10 5:00 12:55 245 • 1220 5:40 2:10 815 • 1:40 6:30 9:05 2:20. 7:35 Leave Southworth 4:25• 9:50 155• 5:00 • 10:10 3:50. 6:90 11:10 4:05• 0:40 • 11:35 5:05 7:55 • 12:30 5:30. 1:20• 1:10. 6:30 9:20 230 • 7:20 8:30 9:350 11:05 12:25 • 1:411. dvadlen Saturday and Sunday 19003 Faunlleroy 5:15 1310 3:00 11:40 6415 1345 4:00 10:05 6:55 11:10,4 4:40 2 10 7:39 11:45 630.,.• 8:55 1220 6:20 9:15 1:40 7:40 9:45..0 2:20 10:20 Leave Southworth .1:25 10:00 1:10 0:05 10:20 a 2:25 6:50 10:15 3:10 /40 1190 3:50 0:20 1200''-• 4:50 9:27 12:30 5:30 alrx3 ea mllMeJealmaavaealnry 6:35 3... 7:10 8:30 11:05 • 10:25 • 1.10. rYr-:rri^-i'=ECRL. - I(jSi i.'rYl add Central Floret Wale,, bicycler, and kayak not 0deted and in tine at least 20 minutes prior to printed drparlure Erne nayeot be loaded Vessel loving 9,3 stop two nvnulto grim doparlore IIm0. Wide space on tholes -act n ,ppnllioned to ex!: island, so lases making 0.151100011930. slopsmay depart 3.413 empty Ware Puple Shade. Inlana0an4 ah:9 663. Shade dlehland track Jl, (urn not rase nnororaa cl Fidaysoly 3. 3dul 1, c331y Sundays pay 1,01 0.0,1 Sundays Mom is dgmega time Dep ince 31 mmol lira Westbound Notes • Priority for Sidney, EC vehkles ticketed and In One nes later than 4300.a 1n. • UnloadswesgMund traffic en eadmound sal 1, • toads,vnw lbnd traffic on eastbound 01309. • leo intuisland vehicles looted Ea-Atbo .a Notes • I pasengers and ihl/ blongky hoar6ng k friday Hutu are surfed to U.S. Cargoes, and Border Sholretian 1,15. ,. a Ur -toads mlbwndOdN3c m nlboundsalling. • Loads eumound:raffle on emorbamd • 30tH No islarrclwhidm loaded. • This sailing ac4sion00y makes a prearranged toy, al Loper to pink up ly school,Lida 000 .m•enge , .hizh may delay the Aro, 86 arrival brrpm,matdy to .ein)es. • They vessel 3.11 load, rno.•• 600y to the tie-up dip, that sa i :o Ones. . The 11:35 a m. inhadand 0 from Ida, Harbor ::ors 31 a Shaw Ihs3 Oxn to Occas and raper. Monday through Friday Sal urday and Sunday Leave Fauntleroy Leave Fauntieroy 0:15 110:40 4:00 8:55 5:15 11:45 4:00 8:00 550 11.40 4:40 9:20 6.05 12:20 430 9:20 0:10 11.55 5:00 10:20 6.55 12:50 4:40 10:20 ':00 12:20 5:40 11:40 7.35 1:20 5:101.,, 11:40 7:05 1235 6:00 12:55 535 1:40 5:40 12:05 P.:25 1:20 6:30 2:10 9:15 2:00 6:20 2:10 9:05 1:40 7:05 1310 2:20 6:40 9:25 245 7:35 10:45 3:00 7:20:.. 1020 3:05 8:05 11:10,, 3:20 7:40 Leave Va,hon leave Vachon 4:05 8:15 12:50 7:40 4:45 1040., 145 6:55... 4:45 1100 1:50 8:30 5:35 11:15 3:30 7:10 0:20 900 2:20 8:50 6:25 11:50 3,50 7:30 5:45 9:40 3:25 9:55 7:10 12:20 4:10 8:50 6:20• 10:10 4:30 10:45. 03:09 12:50 4:45•.. 9:55 6.40 3030 5:10 12:05 • 010 1:15 5:10 10:45• 7:00 11:30 5:30 1:2011 9:20* 1:30 5:35,4, 12:00• 7.15 11:55 6:30 9'40 1:50 550 1.205 755 1125 6:55 1020 230 610 • 1,3,r p• yr only Monday through Friday Leave Southworth 4:25 9:20 1:10. 8:30 5:00 9511 230• 9:35'- 0.00a 1010 4:05 • 11:05. 6:40 11:10 5:05 12:00• 7:55 11:35 6:30 1:400 830 12:30 7:20 Leave Vas on 405• 1755 3.40 1045 6:15 12:05 7:30 1245 9:30 205 3:30 5:25 6:05 7:00 8:00 9:20 10:45 12:05 140 200 Salorrlay and Sunday Leave Southworth 4:25 10:20 3:10 1I:05• 0:0.5 10:55 3:50 12:25• 6:50 11:00 4:50 240• 7:10 12:00•, 5:30 8:20 1230 6:35. 9:20 1:10 7:10 10:00 225 8:30 Leave VaShon 5:40 1635 145 9:30 11:10 3:25 7:20 11:35..' 4:25 8:00 1110 5:05 9410 1230 6:45 9:40 105 8:05 .1120„ 10:45 12:05 1:20 2:00 "'� I - „3 JI M d. m dwe :.,.1 paw .er:,u a. num Y J 93 rwhy., Daily Leave Point Defiance 5,05o, 10:05 3:40 5:59 10.55 4:35 6:46 11:45 5:30 7:35 1235:.'. 6:30 0:25 1:40 7:25 9:15 2:40 8:25 Leave Tahlequah 5:30"1 1030 4:05 0:20 11:20 5:00 7:10 12:10 6:00 8:00 1:0004 7:00 8:50 110 8:80 9410 3:10 9:00 9:30 ear 4e110ne Pet•n velotela a• Iraee380net, BC In1m44a18 note m.dla ale 10:30 Put Tm.nund'eoweemelcun. ensure /hiyhle WORITI7Ified. 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Whir, and baggage me sub3rct inspection. Articles you, ing into data courtly :we0413 u61«t tc 134, reseed Read and 1nd0du9, +dt felony or DUI convictions trendy denied entry Into 01,044 Abe Canada,. lav prnhfulla h dy:floats hum bringing guns, mace, 71270 ,May 0,4011190,o1u11350010 pr014ns km Cn4a. Traveling ,with Childless U.S. and Cmnadn:roans who are 15vean old �oengee me allooed ton 3vdaj copy d th. birth d�6601e, a, are 00,0 between lhe ag u 16 andI8i1Nay me part. an adult. uptnasedseh o0teliegleln,+Nn.ala athletic gaup. I both doh 70O,e.am • teaseling v9thdvidm. you most haveitt- ml0 auth,6a3 loon 11,1 parent(s)along r:th , relpha:, number where they can bel called to verily the nutho0d4aAmah M9 dce ,end,,3Fare mmay30,IMt,o122 inadmissible to Canaan. Gnl:,rna and Inmrigralinn Contacts For moreMIglom. bad m0slaorM trawl, plane sunsuit the fdt rirg authorities in advanced Your olp: • 115 Customs and Bade Protection: 160.2933131 • Canadian Customs and Immigntm: ,00.0914831, (hon: Canada) • Canadan Bader SOvire 204.9833500 F 4 z LUCKY HOME BUILDERS CITY OF TUKWILA, KING COUNTY, WASHINGTON Southgate Creek Fish Distribution Study Prepared For: Jeff Pantier, PLS Sr. Vice President Hatton Godat Pantier 3910 Martin Way E, Suite B Olympia, WA 98506 Prepared By: Curtis Wambach, M.S. Senior Biologist and Principal EnviroVector 4333 30th Avenue SE Lacey, WA 98503 16 March 2014 LUCKY HOME BUILDERS SOUTHGATE CREEK FISH DISTRIBUTION STUDY Prepared For: Jeff Pantier, PLS Sr. Vice President Hatton Godat Pantier 3910 Martin Way E, Suite B Olympia, WA 98506 Prepared By: Curtis Wambach, M.S., Senior Biologist and Principal EnviroVector Lacey, WA 98503 (360) 790-1559 Phone www.envirovector.com 16 March 2014 % 1 Lucky Home Builders Fish Distribution Study 1.0 INTRODUCTION At the request of the landowner, a fish distribution study was performed on a watercourse referred to by the City of Tukwila as Southgate Creek. As part of the fish distribution study, various existing reports on Southgate Creek have been reviewed and fish barriers have been evaluated to determine fish passage. This fish distribution study report has been prepared to identify potential fish distribution in Southgate Creek as it refers to the proposed land use on the subject property. 2.0 SITE LOCATION The 0.82 -acre subject property (7360600532) located in the City of Tukwila, King County, Washington in Section 12, Township 23 North, Range 04, Willamette Meridian (Figure 1; Appendix A). 3.0 STUDY AREA The study area consists of a watercourse, labeled as Southgate Creek by the City of Tukwila, extending approximately 3,900 feet in length from immediately west of the subject property north to the Cedar River (Figure 1). 4.0 METHODOLOGY 4.1 Background Review Background information on possible wetlands was reviewed prior to field investigations and included the following: • City of Tukwila GIS database • Salmonscape Database • City of Tukwila 2013 Surface Water Comprehensive Plan • Department of Natural Resources (DNR) • King County iMAP 4.2 Field Investigation The fish study has been performed on: • 9 March 2014: Minnow Traps & Seining • 8 March 2014: Minnow Traps & Seining • 2 March 2014: Minnow Traps & Seining • 1 March 2014: Minnow Traps & Seining • 24th June 2013: Characterize Riparian Area EnviroVector Page 1 16 March 2014 / Lucky Home Builders Fish Distribution Study The fish study consists of seining using a dip net and trapping using minnow traps. Seining occurred at five locations (Appendix A, Photos 45, 46, & 48): 1) South 131st Place 2) South 13rd Street 3) East Marginal Way South 4) South of 42nd Avenue South 5) North of 42nd Avenue South, south of the subject property, extending west of the subject property to north of the subject property. Seven minnow traps were set for 4 days over two weekends in March. Traps were baited with bread and sardines. Traps were placed in pools of water south of the subject property and north of 42nd Avenue South (Appendix A, Photos 33, 34, 37, 38, & 39). 5.0 STUDY RESULTS 5.1 Review of Existing Information City of Tukwila Surface Water Comprehensive Plan 2013 The City of Tukwila Surface Water Comprehensive Plan (2013) labels the subject watercourse as Southgate Creek. The Plan states that the Southgate Creek basin is 546 acres in size and 89 percent of the basin is within the City of Tukwila. The Creek passes underneath S 133rd Street and 42nd Avenue S through more than 500 feet of culvert and merges with the east fork coming from a ditch along S 132nd Street. From there, the main stem of Southgate Creek extends under SR 599 through about 320 feet of culvert, a fish ladder, and large arch culvert into the Duwamish (Cedar) River downstream of the Black River confluence. The section of the main stem just downstream of the confluence of the West and East Forks is often completely blocked by sediment and debris. The Plan reports that juvenile salmon are regularly released into the stream by a nearby homeowner, which would explain why juvenile salmon are found above complete fish barriers. However, because of a steep gradient, the Pian states that fish are unlikely to be present in the Southgate Creek upstream of Macadam Way S. According to WDFW, Coho salmon potentially are present in Southgate Creek. Resident trout and other types of non-anadromous fish could also be present. According to the 2013 City of Tukwila Surface Water Comprehensive Plan, the fish ladder at the SR 599 culvert is a fish barrier to anadromous fish during low stream flows. An inventory of fish barriers as a part of the 2013 City of Tukwila Surface Water Comprehensive Plan can be found in Appendix B. The Plan labels the flap gate located at the outlet of Southgate Creek at the Cedar River as a non -barrier. However, this flap gate likely does not allow fish to pass (Appendix A; Photo 14). The Plan identifies one potential fish barrier, two partial fish barriers, and one total fish barrier downstream of the subject property. The total fish barrier is located at S 133rd St and E Marginal Way (Appendix A, Photos 26 & 27). Thereby, no fish are expected to occur naturally upstream of this total fish barrier. EnviroVector Page 2 16 March 2014 Lucky Home Builders Fish Distribution Study King County iMAP The King County iMAP illustrates the general location of Southgate Creek from immediately west of the subject property to the Cedar River (Appendix C). DNR Stream Typing Map The DNR Stream Typing Database identifies Southgate Creek located immediately west of the subject property (Appendix D). The reach of this stream located at the subject property is identified as a Type N, no salmonid fish. Immediately downstream (north) of the subject property the stream is identified as a Type F, containing salmonid fish. This stream is a small tributary of the Duwamish River. WDFW Salmonscape Database The Washington Department of Fish and Wildlife (WDFW) Salmonscape database documents the presence of Coho salmon in the lower portion of Southgate Creek (Appendix E). The upper portion of Southgate Creek at the subject property and downstream of the subject property to East Marginal Way South (above the total fish barrier) is identified as `potential presence' of Coho salmon. WDFW Priority Habitats and Species (PHS) Database The WDFW Priority Habitats and Species (PHS) Database identifies resident cutthroat trout and Coho salmon as occurring in Southgate Creek downstream of the subject property (Appendix F). No salmonid occurrence is identified adjacent to the subject property. 5.2 Field Results Southgate Creek West of the Subject Property Southgate Creek has been identified west of the subject property. The fish study identified and mapped the location of this stream similar to that depicted in databases. The stream is located within a ravine of variable slopes. A 24 -inch culvert extends approximately 120 linear feet across 42nd Avenue South north of the subject property (Appendix A, Photos 1- 3). During the site evaluation, only a 0.5 inch deep and 5 inch wide flow was observed at the culvert. The culvert appears to be a partial or complete fish barrier. Winter flows may entrain high velocities through the culvert, creating a fish barrier. Summer flows restrict fish access through no or low water capacity. Sand and gravels form the stream bed immediately upstream of the culvert. Between the culvert and the subject property, bricks and rip -rap form the stream bed and banks (Appendix A, Photos 5-7). Minimal fish habitat occurs in this area. West of the subject property, the stream channel is variable in that portions extend through narrow rocky channels, through gravelly pools, muddy meanders, and steep drops in elevation (Appendix A, Photos 9 & 10). Upland vegetation dominates plant species identified in the riparian area. Invasive weeds, such as English laurel, English ivy, English hawthorn, English holly, and Himalayan blackberry, are common in the riparian area. Appendix A, Photos 8-10 demonstrate the domination of the invasive weeds English laurel and English ivy right up to the ordinary high water mark (OHWM). EnviroVector Page 3 16 March 2014 Lucky Home Builders Fish Distribution Study Dominant riparian plants identified in the riparian area (sloped stream buffer) of the creek include: Native Plants Invasive Weeds • Osoberry (Oemlaria cerasiformis) • Beaked hazelnut (Corylus cornuta) • Douglas fir (Pseudotsuga menziesii) • Red alder (Alnus rubra) • Large -leaf avens (Geum macrophyllum) • Lady fern (Athyrium filix-femina) • Bracken fern (Pteridium aquilinum) • Trillium (Trillium ovatum) • Water leaf (Hydrophyllum tenuipes) • Big -leaf maple (Acer macrophyllum) • Sword fern (Polystichum munitum) • Common horsetail (Equisetum arvense) • Western red cedar (Thuja plicata) • Reed canarygrass (Phalaris arundinacea) • English Ivy (Hedera helix) • Himalayan blackberry (Rubus discolor) • English laurel (Prunus laurocerasus) • English holly (Ilex aquifolium) • European mountain ash (Sorbus aucuparia) • Creeping buttercup (Ranunculus repens) • Robert's geranium (Geranium robertianum) • English hawthorn (Crataegus laevigata) Characterization of Southgate Creek and Fish Barrier Analysis A downstream analysis was performed on Southgate Creek to characterize stream and riparian habitat from the Cedar River to the subject property in reference to potential fish presence. Maps and databases were reviewed in search of the Southgate Creek outlet. From reference maps and from review of the 2013 Surface Water Comprehensive Plan, the outlet appears to be a flapgate on the Cedar River west of the 42nd Avenue S Bridge (Appendix A, Photos 14 & 15). It is unlikely that fish can pass this flapgate. During low water on the Cedar River fish cannot pass the flap and during high water on the Cedar River, the flap snaps shut to prevent water from flowing upstream on Southgate Creek, preventing fish access. Fish access from the Cedar River only could occur if an alternate outlet exists other than the flapgate. Fish barriers upstream have been identified that would discourage fish access to the reach near the subject property. Potential and partial fish barriers have been identified at the interurban Avenue South Bridge by the 2013 Surface Water Compressive Plan located approximately 300 feet south of the outlet that discourages fish from passing upstream (Appendix A, Photo 17). Approximately 200 feet south of the outlet, a large stack of canisters marked as hazardous materials are located on the left bank of the Creek (Appendix A, Photo 18). The Creek flows through a culvert at the flapgate extending approximately 100 feet of the outlet. Southgate Creek extends under Interurban Avenue though a culvert approximately 400 feet in length. Approximately 100 feet upstream of the Interurban Avenue culvert, a 650 foot culvert extends along Macadam Road and South 131st Place. The culvert inlet was submerged during the fish study (Appendix A, Photo 22). This culvert has been identified as a partial fish barrier by the 2013 Surface Water Comprehensive Plan because it often plugs with sediment. The Creek extends through a U-shaped roadside ditch along South 131st Place upstream of the culvert (Appendix A, Photos 19 to 22). Then the Creek extends through a restoration area along 44th Place South. A culvert, approximately 520 feet in length, located at East Marginal Way immediately south of Riverton Park has been identified as a total fish barrier by the 2013 Surface Water Comprehensive Plan (Appendix A, Photos 25-27). The 2013 Surface Water EnviroVector Page 4 16 March 2014 l 1 Lucky Home Builders Fish Distribution Study Comprehensive Plan identifies slopes south of the East Marginal Way fish barrier that may pose a natural gradient barrier to fish passage. Another culvert, approximately 200 feet in length, extending under 40th Avenue South approximately 350 feet downstream of the subject property has been identified as a total fish barrier during this downstream analysis. A few inches of rapidly moving water entrains down this steep chute to forcibly jet from the metallic culvert's outlet (Appendix A, Photos 29-32). A trash rack located approximately 15 feet north of the inlet swirls a high velocity stream of water before jetting down the chute to the outlet north of 40th Avenue South. This culvert creates a velocity and water capacity barrier to fish passage. From the 40th Avenue South culvert upstream approximately 200 feet, a structurally diverse stream channel provides pools, riffles, and glides (Appendix A, Photos 41-42). A partial fish barrier is located approximately 100 feet south of the 40th Avenue South Culvert (Appendix A, Photos 35 & 36). Approximately 200 feet north of the 40th Avenue South culvert and 150 feet south of the subject property, the Creek becomes steep and rocky, creating a gradient barrier to fish passage (Appendix A, Photos 45-46). West of the subject property and north of the subject property, the Creek is mostly one long glide (Appendix A, Photos 47 & 48). Fish Distribution Study Juvenile Coho were seined in the portion of Southgate Creek contained within a U-shaped roadside ditch along South 131st Place (Appendix A, Photos 23 & 24; Figure 1). Salmon would have to pass a number of fish barriers (potential, partial, and perhaps total fish barriers) to move from the Cedar River to this location. Fish were also seined at South 133rd Street. Coho were also seined at East Marginal Way South upstream of a total fish barrier identified by the 2013 Surface Water Comprehensive Plan (Appendix A, Photos 28). In addition, Coho salmon were seined from immediately north of 42nd Avenue South upstream of a gradient fish barrier identified by the 2013 Surface Water Comprehensive Plan. A number of Coho juveniles were seined and captured in a minnow trap upstream (south) of the total fish barrier under 42nd Avenue South (Appendix A, Photos 37, 38, 40, 43, & 44). The results of the fish study are illustrated in Figure 1 and Figure 2. Coho were identified upstream of total fish barriers, natural and human created. It is highly unlikely that Coho could run the gauntlet of fish barriers, natural and human created, to spawn and produce juveniles south of 42nd Avenue South. Juveniles cannot pass the culvert upstream of 42nd Avenue South. It is unlikely that adult Coho could pass this total fish barrier. Even if the 42nd Avenue South culvert did not occur or was removed, the slope would likely create a gradient barrier to salmonid access. It seems to be a mystery on how juvenile salmonids could occur above natural and human created fish barriers. However, the 2013 Surface Water Comprehensive Plan Page 2-14 reports that Juvenile Coho are regularly released to Southgate Creek by a nearby homeowner. Another natural fish barrier occurs approximately 100 feet upstream from the total fish barrier that is the 42nd Avenue South Culvert (Appendix, Photos 35 & 36). At first glance, it may appear that some adult Coho could pass this barrier. However, further evaluation found no plunge pool or runway that would allow the fish to gain the momentum necessary to hurdle the barrier. Another consideration is that water levels rarely are higher than that seen in winter photos (Appendix, Photos 35 & 36) as evidenced by the growth of upland vegetation at the water line and the lack of channel scour above the water line. Yet, EnviroVector Page 5 16 March 2014 \ i Lucky Home Builders Fish Distribution Study juvenile Coho were found above this fish barrier. The most likely explanation can be found in the 2013 Surface Water Comprehensive Plan Page 2-14, which reports that juvenile Coho are regularly released to Southgate Creek by a nearby homeowner. It is likely that the juvenile Coho identified upstream of total fish barriers were implanted by this nearby homeowner. 6.0 REGULATORY CONSIDERATIONS Streams Fish presence affects stream typing. However, if juvenile fish are released regularly to Southgate Creek upstream of natural and human created fish barriers by a nearby homeowner, then these fish would not be there without direct human action and the presence of these implanted fish should not affect the stream typing. Thereby, the presence of these implanted fish would not change the stream typing and would not change the regulatory considerations of this proposed land use. The subject stream is classified as a Type Np under the City of Tukwila Code Chapter 18.45.100(A) ---Watercourse Designations, Ratings and Buffers: Watercourse Ratings, given that the watercourse is perennial and is not used by salmonid fish. Under City of Tukwila code Chapter 18.45.100(C) ---Watercourse Designations, Ratings and Buffers: Watercourse Buffer Widths, Type Np watercourses require an 80 -foot standard buffer width. Under City of Tukwila code Chapter 18.45.100(C) ---Watercourse Designations, Ratings and Buffers: Watercourse Buffer Widths, all commercial and industrial buildings shall be set back 15 feet and all other development shall be set back 10 feet from the sensitive area buffer's edge. The building setbacks shall be measured from the foundation to the buffer's edge. Building plans shall also identify a 20 -foot area beyond the buffer setback within which the impacts of development will be reviewed. The Director may waive setback requirements when a site plan demonstrates there will be no adverse impacts to the buffer from construction or occasional maintenance activities. Table 1: Cit of Tukwila Regulatory Summar Stream Type Buffer Buffer Reduction with Enhancement Buffer Enhancement Offsite toweeds, west Np 80' 40' Eliminate invasive plant conifers to shade out invasive weeds Buffer Reduction Under City of Tukwila Code Chapter 18.45.100(E) ---Watercourse Designations, Ratings and Buffers: Variation of Standard Watercourse Buffer width, the standard buffer width of Chapter 18.45.100(C) may be decreased up to 50 percent with enhancement pursuant to conditions under that section, provided that the buffer is significantly degraded due to conditions that include the presence of significant amount of invasive vegetation that impairs buffer function and provided the remaining buffer is enhanced in accordance with an approved buffer enhancement plan prepared by a qualified professional. EnviroVector Page 6 16 March 2014 Lucky Home Builders Fish Distribution Study 7.0 CONCLUSIONS AND RECOMMENDATIONS Juvenile Coho were identified in Southgate Creek extending upstream to 100 feet downstream of the subject property. Juvenile Coho were identified above natural and human created total fish barriers that were identified in the 2013 Surface Water Comprehensive Plan and during the fish distribution study. The best explanation of how these Juvenile Coho are found upstream of natural and human created fish barriers is explained in the 2013 Surface Water Comprehensive Plan Page 2-14, which reports that Juvenile Coho are regularly released to Southgate Creek by a nearby homeowner. It is likely that the Juvenile Coho identified upstream of total fish barriers were implanted by this nearby homeowner. Thereby, fish implanted above natural and human created fish barriers should not affect the stream typing. One Type Np stream has been identified west of the subject property. Under the City of Tukwila Code, an 80 -foot standard buffer is proposed. The stream buffer (riparian area) is dominated by invasive weeds. Buffer reduction with enhancement is proposed. The proposal reduces the 80 -foot standard buffer to 40 feet with enhancement. Enhancement will include the elimination of invasive weeds and the planting of conifers to shade out weeds, encourage the growth of native vegetation, and to aid in slope stabilization. Buffer enhancement is recommended to improve habitat value in the riparian area and to aid in slope stabilization. The elimination of invasive weeds will allow for the growth of native vegetation. The planting of shade -tolerant conifers under the canopy of red alder will act to shade out invasive weeds and to aid in slope stabilization. Conifers acidify the soils to discourage the growth of invasive weeds and to enhance the growth of native vegetation. Buffer enhancement is proposed in the wetland report. EnviroVector Page 7 16 March 2014 / Lucky Home Builders Fish Distribution Study 8.0 REFERENCES Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Department of the Interior. FWSOBS-70/31. Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1, US Army Engineer Waterways Experiment Station, Vicksburg, Miss. Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press. 730 pp. Iowa State University. 1995. Hydric Soils of Washington State. U.S. Department of Agriculture, Natural Resources Conservation Service. December 5. Munsell Color. 1988. Munsell Soil Color Charts. Kollmorgen Instruments Corp., Baltimore, Maryland. Reed, P.B. Jr. 1988. National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USF&WS Biol. Report 88. Reed, P.B. Jr. 1993. Supplement to: National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USF&WS Biol. Report 88. Reed, P.B. Jr. 1998. National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USF&WS Update. U.S. Department of Agriculture, Soil Conservation Service. June, 1991. Hydric Soils of the United States. U.S. Department of Agriculture, Soil Conservation Service. 1973. City of Tukwila Area Soil Survey. U.S. Fish and Wildlife Service. 1973. National Wetlands Inventory Map, Issaquah Quadrangle. Washington State Department of Ecology. 1997. Washington State Wetland Identification and Delineation Manual. March. Washington State Department of Ecology. 2004. . Washington State Wetland Rating System for Western Washington. Ecology Publication # 04-06-025. August. Washington State Department of Natural Resources. 1994. Endangered, Threatened and Sensitive Vascular Plants of Washington. Washington State Department of Fish and Wildlife. 1999. Species of concern: State candidate species. WDFW. Olympia, WA. EnviroVector Page 8 16 March 2014 / / Lucky Home Builders Fish Distribution Study Washington State Department of Health. 2002. Glendon Biofilters; Recommended standards and guidance for performance, application, design, and operation & maintenance. Office of Environmental Health and Safety. Olympia, WA. WRP. 1993. Installing Monitoring Wells/Piezometers in Wetlands. WRP Technical Note HY-IA-3.1, August 1993. EnviroVector Page 9 16 March 2014 Lucky Home Builders Figures Fish Distribution Study EnviroVector Appendix 16 March 2014 360-790-1559 www.envirovector.com A Trapping: Fish Captured A Trapping: No Fish Captured O Seining: Fish Captured Q Seining: No Fish Captured — Subject Stream — Culvert: Stream Piped Figure 2 Lucky Home Builders Fish Study Scale: 1" = 120' ,! I 0 8 March 2014 f c rr >; bey ,4. Cedar River -.3 123I-;l ST 1 1Barrier .. .-,F,, -7-13,0 ..yr� Partial Fish - (2013 Surface,water Comp. Plan) I ° 1 °l _I - Fla Gate ,c ,'• Poteritial & Partial Fish Barriers (2013 Surface water 1 CPI an om ' •0.k • ..r . f ,35 .. t t: • j 07,1 6� . u� �k •', .. ,a. •• j`4e • Tal••Fish Barrier„ iiuiir41:k; i'asAk —Total . Fish' • �. , Barrier ' ' ��;. f (2 water; 013 Surface ter f f ;•,„ Comp. Plan) r �;,r �7 ' ' 7Traps.. _ � f.: Set :&II�- • sty :Subjqt lrfi P ,� sf \ -) 1.IFFTft T- OSeining: Fish Captured Figure 1 Scale: 1" = 450' Y �,'j� ector '""' LuckyHome 1 l Seining: No Fish Captured 360-790-1559 — subject stream Builders 0 450' www.envirovector.com — Culvert: Stream Piped Fish Study 8 March 2014 Lucky Home Builders Fish Distribution Study Appendix A Photos Lucky Home Builders Fish Distribution Study Photographs Taken on June 24th 2013 ert under 42 Ave South )m.. ,,,,� W,w 2) Trash rack between culvert and 42 Ave Ave S 5 inch cult' _._ Stream at culvert that extends under 403, Ave South 4 Lower portion of stream off sst?, just upstream of cult' ^."X. k .. �.•`. .k�"^�aam .. � ..w.. , .. •..�"'�'"�'�raa .- ��,-�M. . ^� r,,,,.� , w'"1 ...xw . 'A�"...`. U ��„y,�„�;w�;....��: ,��.,, � ) Lower portion o aff-site, pink f:eg on ©HWM Stream e subject property EnviroVector Appendix 16 March 2014 Lucky Home Builders Fish Distribution Study 7 Bricks on the banks of the creek west ref the site 8 En fish Laurel on banks of creek east of site, ink English Laurel & English ivy at OHWM pink fl 11) Building area onsite 12) Building area onsite EnviroVector Appendix 16 March 2014 Lucky Home Builders Fish Distribution Study Photographs Taken During March 2014 42" Avenue S B at South ate outlet on the Cedar River Flap gate at Southgate outlet on the Cedar River Ponded water north of Inte urban Ave South 17) Bridge at Interurban Avenue S 18) Stack of canisters next to Creek at Interurban Avenue S EnviroVector Appendix 16 March 2014 Lucky Home Builders Fish Distribution Study gate Creek at S 131 Pia 23) CDho seined from Southgate Creek at S 131 Place 24) Coho seined from Southgate Creek at S 131 Place EnviroVector Appendix 16 March 2014 Lucky Home Builders Fish Distribution Study C lvert � _tlet at E I4 argl Way South, Full fish Barrier 26} Culvert Outtet at E Marginal Way South, Full fish Barrier EnvirciVector Appendix 16 March 2014 Lucky Home Builders Fish Distribution Study 27) Culvert outCet at Mar incl Wa South, Full Fish Barrier 28} Culvert outlet at Mom mal Via South. Full Fish B 29} Culvert inlet at 40°` Avenue South 30} Culvert inlet at 40th Av,nue South EnviroVector Appendix 16 March 2014 ier Lucky Home Builders Fish Distribution Study vert outlet at 40th Avenue South :32 Culvert outlet at 40th Avent. e South nnow trap used in South ate Cree c t Project SiQte��no� } p _ Site 4 Mitra in Sotrth ate t..r�ek at Pro 35Partial F sh Barrier downstrea Fish 3arrier downs yearn of subject ptope EnviroVector Appendix 16 March 2014 Lucky Home Builders : Fish Distribution Study 37} Juvenile Coho in Minnow trap downstream of project site 38j Juvenile Coho in Minnow trap downstrea ap in Southgate Creek downstream o p e 4O' Coho in Creek downstream of proje EnviroVector Appendix 16 March 2014 site Lucky Home Builders Fish Distribution Study 41) Stream downstream of projec 42) Stream downstream of project site 7• - 43'} Juvenile o seined sou of 40 Ave South 44) Juvenile coho seined south of 40th Ave EnviroVector Appendix 16 March 2014 Lucky Home Builders. Fish Distribution Study 45) Seining aijacent to project site. No fish EnviroVector Appendix 16 March 2014 iiie. No fish Captured Lucky Home Builders Fish Distribution Study 47) Seining adjacent to Project Site. No fish captured 48) Seining adjacent to Project Site. No fish captured EriviroVector Appendix 16 March 2014 /^1 Lucky Home Builders Fish Distribution Study Appendix B City of Tukwila 2013 Surface Water Comprehensive Plan EnviroVector Appendix 16 March 2014 Lucky Home Builders Fish Distribution Study j '"150011 fII 20533 ._..• .F� 20534•ry'r 1 1677 K4� ::.Rt i5:0006) "•� `C„4 iia 1E7-61244 /' 21 065,1, ...561i23 -1 .""t fol l:1 7, \". 173 l�fSt130th1Styt -t., [ .L4 - 1 9L }n 0410 g S1136tliti) ,S1137th'Sti 019 9 55o5 b2_Z i} 50027) . n09R 5500291 50030 'l ''sk ig • -'-▪ 5n. 14""0 ', .ke.ay ,"s ' • T , �, , {Y r tp�'; j i"'' t � rt•�t�i1•41!i• ,r tS140th,St sdT ;t ,. 1 ''f Sj1stSttil,4,�Itii.'+a" i?a f. ;t.' .Ste., 142}ndSt.' r,.rn; =t�.„re. t .4 7.7 f �.`��! .wM� °Rh• 14 1 y. ` t tt 5 t 1-T..; a t. 1: ; x' 1'1 ..12S 14Pi 4th St„ ' • -t4.1-j.1 'LILL This information is intended for planning purposes only. Additional information would be required to support design and construction. Figure 2. Southgate Creek Fish Passage Barrier Inventory N 0 250 500 1,000 1,500 Feet Legend Fish Passage Features - Culverts Fish Passage Features - Other Barrier Status Barrier Status 0 N/A Q None O Partial Q Potential Q Total t, Partial Total Stream ODrainage Basins ® Tukwila Boundary Path: \\simlia\prof\TukwilaWACity0f1412954SWCompPl\GIS\Layout\Erin\9.3lTukwilaFishPassageMapBook 20111110.mxd ethatche 11/14/2011 8:25:39 AM / Lucky Home Builders Fish Distribution Study Appendix C King County Imap County Wetland map EnviroVector Appendix 16 March 2014 �o;oaAw!Au3 1760Z 4OJ2W 96 / \ • m 31" AvE s / 3 OAVES 37TH AVE S VT) AVZ S STH AVE S 4 715TH AUE 9 41 .4 yp tiutw Jcfii, 11 - Ef r (p 2 1n 's cip \ to ~ co ian1 vl s 1 Ayes \ t' n J 1 saappg awoH A>lon1 Aprils uopgpisio gsi3 / \ i Lucky Home Builders Fish Distribution Study APPENDIX D DNR STREAM TYPING MAP EnviroVector Appendix 16 March 2014 �010a^OJ!AU tiLOZ 4aeW 96 / i saapung awoH 4on1 Apn1s uoi;ngp sia gsid \ Lucky Home Builders Fish Distribution Study APPENDIX E SALMONSCAPE DATABASE EnviroVector Appendix 16 March 2014 JO OOna!AU8 co co X ti60Z yaeW 96 7 Jo;oaAOMAU D v a CD n X ti 60Z goaeW 91- l \ f \ sJeppn8 awoH 11on1 �(pn;g uognqu;s!a gs!d / \ Lucky Home Builders Fish Distribution Study APPENDIX F WASHINGTON DEPARTMENT OF FISH AND WILDLIFE (WDFW) PRIORITY HABITATS AND SPECIES (PHS) DATABASE EnviroVector Appendix 16 March 2014 i7lora E7JaTA ! HII•Y_F111N]�i I• • • INSIGHT GEOLOGIC, INC.. c���`�`-M0N'vo TO: Jeff Pantier – Hatton Godat Pantier FROM: William Halbert, L.E.G. William E. Halbert 1015 East 4th Avenue Olympia, Washington 98506 Telephone: (360) 754-2128 Fax: (360) 754-9299 DATE: January 15, 2014 SUBJECT: Tax parcel number 7360600532 in Tukwilla, Washington MEMORANDUM In reviewing the City of Tukwilla's zoning ordinance, Section 18.45.120, we understand that buffer reduction is allowable in areas where the potential for landslides is slight (slopes Tess than 15 percent). We believe that a reduction in the buffer width is acceptable in the area of"a 7o-T—posed residential structure since the slope leading down to the seasonal creek is of low to moderate height (18 feet) and the slope angle is on the order of 15 percent. Reducing the buffer width from 80 feet to 40 feet as measured from the toe would still provide a safe distance from the structure's foundation and a flatter than 2H:1 V slope measured from the foundation to the toe of slope. This also meets the requirements of IBC 1805.3.2 where the setback from top or face of the slope is H/3, or in this instance a setback of about 12 feet from face of slope to the face of the building foundation. We trust this memorandum meets your requirements. Please contact us if you have question or require additional information. HATTON GODAT PANTIER Narrative Chapter 18.45.100 (E)TMC Lucky Home Builders plans to subdivide the subject site (Parcel N'6.IL"' wl�14i 736060053203) into 2 single family residential lots. Prior to submitting for Preliminary Subdivision Review, Lucky Homes Builders hereby request Special Permission Director Approval of a stream modification buffer from 80 feet to 40 feet. APR 29 2.014 Please find enclosed the following information in support of this request. a. Site plan indicating planned 2 -lot subdivision, contemplated improvements, stream and topographic information, dated April 8, 2014. b. Wetland and Watercourse Sensitive Area Study Report, dated March 26, 2014. c. Southgate Creek Fish Distribution Study, dated March 16, 2014. d. Geotechnical Soils Investigation Report, dated September 26, 2013. e. Geotechnical Memorandum dated January 15, 2014. The requested buffer reduction will not result in direct, indirect or long term adverse impacts to the adjacent stream. A buffer enhancement plan has been provided and will be implemented with the subsequent subdivision improvements. A minimum of 10 -foot setback will be maintained from the top of slope throughout the length of the stream segment. Additionally, all buildings will be setback a minimum of 50 feet from the ordinary high water mark of the stream. E:\office\JOBS\2013\13-039 Tukwila Residential Site Plan\LAND USE\Special Permission Director Approval N a rrative-04.08.14. d oc Hatton Godat Pantier, Inc. 3910 Martin Way E, Suite B Olympia, WA 98506 ENGINEERS AND SURVEYORS T 360.943.1599 F 360.357.6299 800.700.1 693 hattonpantier.com / 1t) ttir 0 SENSITIVE AREA ORDINANCE — Deviations, Alterations or Uses Requiring Administrative Review and Approval • Setbacks TMC 18.45.080(E) and TMC 18.45.100(D). All commercial and industrial developments shall be set back 15 feet and all residential development shall be set back ten feet, measured from the foundation to the buffer's edge. The Director may waive setback requirements when a site plan demonstrates there will be no impacts to the buffer zone from construction or occasional maintenance activities. • Buffer Reductions TMC 18.45.080(F) and TMC 18.45.100(E). (Please note, no buffer reduction is permitted where the buffer consists of undisturbed, native vegetation.) The Director may reduce the standard wetland/watercourse buffers on a case-by-case basis, provided the buffer does not contain slopes 15% or greater. Under certain circumstances, a buffer reduction may be considered for property with slopes less than 15% (see TMC 18.45.080(F) and 18.45.100(E)). The approved buffer width shall not result in greater than a 50% reduction in width. Any buffer reduction proposal must demonstrate to the satisfaction of the Director that it will not result in direct or indirect, short-term or long-term adverse impacts to wetlands or watercourses, and that: 1. Additional protection to wetlands will be provided through the implementation of a buffer enhancement plan; 2. The existing condition of the buffer is degraded; 3. Buffer enhancement includes, but is not limited to the following: (a) Planting vegetation that would increase value for fish and wildlife habitat or improve water quality; (b) Enhancement of wildlife habitat by incorporating structures that are likely to be used by wildlife, including wood duck boxes, bat boxes, snags, root wads/stumps, birdhouses and heron nesting areas; or (b) Removing non-native plant species and noxious weeds from the buffer area and replanting the area subject to TMC 18.45.080(F)(2)(c)(1). • Uses Requiring Administrative Review and Approval The following uses may be permitted only after administrative review and approval by the Director — see TMC 18.45.070(B) or TMC 18.45.110(B) for additional guidance: 1. Maintenance & repair of existing uses/facilities where additional fill will be placed or heavy equipment used; 2. New surface water discharges to a sensitive area; 3. Placement of bioswales and dispersion outfalls in a wetland or watercourse buffer; 4 Enhancement or other mitigation including landscaping with native plants; 5. Construction of essential utilities; 6. Construction of new essential public streets, roads and rights of way; 7. Public or private use and access; 8. Dredging, digging or filling in a sensitive area or its buffer; 9. Removal of hazardous trees from a sensitive area; 10. Transfer of wetland mitigation to a wetland mitigation bank (TMC 18.45. 090(E)) or other off-site mitigation. • Alterations Requiring Administrative Review and Approval by the Director (TMC 18.45.090(B), TMC 18.45.110(B)). 1. Piping, rerouting or diverting a watercourse 2. Any alteration to a sensitive area or its buffers, including vegetation removal, or alterations to wetlands less than 1,000 sq. ft. (see TMC 18.45.090(B)(5)); 3. Approval of a Sensitive Area Master Plan or any alteration to an approved Sensitive Area Master Plan H:\Land Use Applications in PDF\Special Permission Director -March 201 I.doc 3-4-11 TO: ATTON 500AI PANTIQ 3910 Martin Way E, Suite B Olympia, WA 98506 Phone 360.943.1599 Fax 360.357.6299 hattonpantier.com TRANSMITTAL LETTER Ms. Teri Svedahl City of Tukwila DATE: Department of Community BUSINESS/AGENCY: Development ADDRESS: April 29, 2014 PROJECT NAME: Tukwila Residential Site Plan 6300 Southcenter Blvd., Ste 100 AGENCY #: CITY, ST ZIP: Tukwila, WA 98188 HGP PROJECT #: 13-039 WE ARE SENDING YOU: ® Prints ❑ Mylars ❑ Specifications ® Other COPIES 1 DATE 04/02/14 DESCRIPTION Client Check in the Amount of $1,539.30 1 04/07/14 Special Permission Director Application 1 04/07/14 Special Permission Director Checklist 1 04/25/14 Affidavit of Ownership & Hold Harmless Permission to Enter Property 1 04/0714 Narrative Summary 1 01/15/14 Geotechnical Memorandum Prepared by Insight Geologic, Inc. 1 09/26/13 Soil Investigation Report Prepared by Insight Geologic, Inc. 1 03/16/14 Southgate Creek Fish Distribution Study Prepared by EnviroVector 1 03/26/14 Wetland & Watercourse Sensitive Area Study Report Prepared by EnviroVector 2 04/08/14 Full -Size Preliminary Site Plans & 1 Reduced (11" x 17") of Same ITEMS TRANSMITTED FOR: ® As Requested ❑ Signature ® Your Use & Information ❑ Approval ❑ Review & Comment REMARKS: Please process the enclosed documents. If you should have any questions, please contact Sabrena Orr at (360) 943-1599 or via e-mail to sabrenao(a)hattonpantier.com. Thank you FROM:c Beverly Carter for Sabrena Orr, Assistant Project Manager CC: Lucky Homes Builders, LLC Correspondence File 13-039 Regular Mail Overnight UPS Courier HGP Delivery via Client pickup CITY OF TUKWILA Department of Community Development 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 931-3670 FAX: (206) 431-3665 E-mail: planning a,TukwilaWA.gov AFFIDAVIT OF OWNERSHIP AND HOLD HARMLESS PERMISSION TO ENTER PROPERTY STATE OF WASHINGTON ss COUNTY OF KING The undersigned being duly sworn and upon oath states as follows: 1. I am the current owner of the property which is the subject of this application. 2. All statements contained in the applications have been prepared by me or my agents and are true and correct to the best of my knowledge. 3. The application is being submitted with my knowledge and consent. 4. Owner grants the City, its empty zees agents, engineers, contractors 9r.other representatives the right to enter upon Owner's real property, located at 4 2 V etn 19 C'. �►J '� for the purpose of application review, for the limited time necessary to complete that purpose. 5. Owner agrees to hold the City harmless for any loss or damage to persons or property occurring on the private property during the City's entry upon the property, unless the loss or damage is the result of the sole negligence of the City. 6. Non -responsiveness to a City information request for ninety (90) or more days, shall be cause to cancel the application(s) without refund of fees. EXECUTED at / " + ver vs(ewe( (city), (state), on On this day personally appeared before me ,20��- '4' — (Print Name) 03-g ""/fict'eerur 2- ittererr g'! l unt e oho (Address 2 - 7c,- -333/ C1 (Signature) to me known to be the individual who executed the foregoing instrument and acknowledged that he/she signedlhe same as his/her voluntary act and deed for the uses and purposes n```t�c�r lttj�+ vri/'' CIS) A CEFORE ME ON THIS (3J , DAY OF Irl' , 20 /1 S1 O N qt... S �� �.. .) eN; N�'� B in and fob the State of Washington `' NOTARY residing at �, (�Q My Commission expires on 3 a? . �((Y 1. PUBLIC i 0 � —12'6%6'3/27120:X ......... •\4. .� 11:\Land Uscn 1.twnfl�HFFSppgpi]�' i�ogAtrcclor-March 201 I.doc 111J h ,1 ) RECEIVED CITY OF TUKWILA APR 29 2014 Department of Community Development ciMtAUNI 1 y SPECIAL 6300 Southcenter Boulevard, Tukwila, WA 98i88'""uF'M 1 ERNIISSION - Telephone: (206) 431-3670 FAX: (206) 431-3665 E-mail: planning@TukwilaWA.gov DIRECTOR APPLICATION NAME OF PROJECT/DEVELOPMENT: Lucky Home Builder - Residental Short Plat LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and subdivision, access street, and nearest intersection. 42nd Avenue South LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement). 736060053203 DEVELOPMENT COORDINATOR : The individual who: • has decision making authority on behalf of the owner/applicant in meetings with City staff, • has full responsibility for identifying and satisfying all relevant and sometimes overlapping development standards, and • is the primary contact with the City to whom all notices and reports will be sent. Name: Address: 3910 Martin Way E, Suite B Phone: (360) 943-1599 FAX: (360) 357-6299 Jeff S. Pantier, PLS, Hatton Godat Pantier E-mail: Jeff` j:y`onpantier.com Signature: H:Uand Use Applications in PDF\Spccial Permission Director -March 2011.doc Date: FOR STAFF USE ONLY Permits Plus Type: P -SP Planner: File Number: L' r - D O -D.' Application Complete Date: Project File Number: rp(l Li t t OL,Q �'� 0 Application Incomplete Date: Other File Numbers: NAME OF PROJECT/DEVELOPMENT: Lucky Home Builder - Residental Short Plat LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and subdivision, access street, and nearest intersection. 42nd Avenue South LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement). 736060053203 DEVELOPMENT COORDINATOR : The individual who: • has decision making authority on behalf of the owner/applicant in meetings with City staff, • has full responsibility for identifying and satisfying all relevant and sometimes overlapping development standards, and • is the primary contact with the City to whom all notices and reports will be sent. Name: Address: 3910 Martin Way E, Suite B Phone: (360) 943-1599 FAX: (360) 357-6299 Jeff S. Pantier, PLS, Hatton Godat Pantier E-mail: Jeff` j:y`onpantier.com Signature: H:Uand Use Applications in PDF\Spccial Permission Director -March 2011.doc Date: U PRELIMINARY SITE PLAN/SHORT PLAT A PORTION OF SECTION 15, TOWNSHIP 23 NORTH, RANGE 4 EAST, W.M. / / / /4,.' / / /.3 VERTICAL DATUM CITY OF TUKWILA BASED ON PK NAIL WITH PAINTED PANEL AT ENTRANCE TO APARTMENT BUILDING ON SOUTH SIDE OF SOUTH 140TH STREET AT 38TH AVE. SOUTH (POINT 419) EL -239.03 CITY OF TUKWILA (SEE SURVEY NOTE 1) r • PREPARED MR LUCKY HOME DU/LDCRS, LLO 6.250 MERCER 1NAY MPRGOM ISLAND, t%A •10040 LEGEND jj PATER VALVE SANITARY SEWER MANHOLE UTILITY POLE 518N CATCH BASIN GUY ANCHOR C,u OVERHEAD UTILITIES • 1? ' 83 SPOT ELEVATION SPOT ELEVATION AT CENTERLINE OF ROADWAY SPOT ELEVATION AT END OF PAVEMENT SPOT ELEVATION AT RITTER LINE CENTERLINE OF GREEK AS DELINIATED BY OTHERS WITH PINK FL4851N5 ORDINARY H1644 WATER NEW PRIVATE ROADWAY SHADED AREA-.ROPCSED STREAM BUFFER REDUCTION AREA 10,051 50. FEET 157' I jam° - I /;` -f. % / 014006EGL E TURNAROUND 'NO PARKINS'', / >DD®> »> VACATED 40TH AVENUE NORTH (FORMERLY DALE STREET) CENTERLINE OF COUNTY ROAD PER SURVEY REFERENCE 4. EASEMENT FOR ROAD PURPOSES ONLY PER AUDITOR'S FILE NO. 3876064. DOCUMENT PROVIDED BY OTHERS AND NOT REFERENCED IN SURVEY REFERENCE MI. UN -OPENED RIGHT-OF-WAY PER SURVEY REFERENCE 4 40' MINIMUM STREAM BUFFER 30' STANDARD STREAM BUFFER CENTERLINE VACATED RIGHT-OF-WAY PLANNED EGRESS AND UTILITY EASEMENT FOR THE BENEFIT OF LOTS 1 AND 2 (.) CORNER OF TRACT 'A' ROBBING VIEW TRACT ADDITION TO RIVERTON VOL. 17 OF PLATS PAGE 90 /00' \ �..-- -. PLANNED 2 -STORK •f RE5IDE70E 23 \\\\\\\\W5°' I6' `.. PLMN STORY: RE5/DENNGk _.. _-(.:OT 2 • • __ --IOP OF SLOPE I DESCRIPTION TRACT 'A' ROBBINS VIEW ADDITION TO RIVERTON, ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 17 OF PLAT5, PAGE 90 RECORDS OF 5I146 COUNTY , WASHINGTON , EXCEPT THE FOLLOWING DESCRIBED PORTIONS THEREOF THE EAST 170 FEET THE PEST 10 rttl OF THE EAST IBC FEET OF THE NORTH 1 FEET OF THE SOUTH 220 FEET THE SOWN 120 FEET, TOGETHER WITH THAT PO0 RTION OF THE EAST HALF OF VACATED 40114 AVENUE SOUTH (FORMERLY DALE STRI=) ADJOINING. SITE DATA ASSESSOR PARCEL NO. SITE ADDRESS: ZONING: TOTAL. AREA: LOT 1: • TOTAL ARCA • D17KAM6 ARCA • TOTAL GOVERA6r ARCA LOT 2 • TOTAL ARCA • DIRLO /6 ARCA • TOTAL GOVOGI65 AREA SEINER: WATER: 736060053203 42ND AVENUE SOWN SEATTLE WA, 48118 1.064 DENSITY RESIDENTAL (1..D21 28,761 50. FEET 11,572 50. FEET 2,000 50. FEET 5,003 55. FEET 17,188 50. FEET 2,007 50. rtt 4,072 50. 700l VALLEY VIEW DISTRICT 125 SURVEY NOTES 1. ELEVATIONS 514014I4 HEREON ARE BASED ON EXISTING TOP OF SANITARY 5EPER MANHOLE ELEV4158.2, A5 DEPICTED BY BOUNDARY, TOPOGRAPHIC AND UTILITY SURVEY PERFORMED BY HARSTAD OONS'ATANTS, SIGNED 12-01-02 AND STAMPED RECEIVED CITY OF TU.KWILA ,.LLY 21, 2003 PERMIT CENTER 2. THE LAND DESCRIBED HEREON HAS BEEN 455/6NED KING COUNTY TAX PARCEL 140. 736060053203 9. SITE ADDRESS, NOT 495/6NED 4. THE LAND DESCRIBED HEREON 15 SUBJECT TO AN UMLOCATEABLE EASEMENT GRANTED TO PACIFIC TELEPHONE AND TELEGRAPH CO. RECORDED UNDER AUDITORS FILE NO. 2605916 S. BASED ON FIELD OBSERVATIONS, PORTIONS OF TIE LAND DEPICTED HEREON HAVE BEEN FILLED WITH VARIOUS M4750/4L5. (5EE GEOTECHNICAL REPORT FOR MORE INFORMATION) 6. TH/5 DRAWING MEETS THE NATIONAL MAP STANDARDS FOR ONE FOOT CONTOI5 INTERVALS ANDA 0RAWIMS SCALE OF 1'•50'. UNAUTHORIZED ENLARGEMENTS MAY EXCEED TIIECC STANDARDS. 7. UNDER6RLU/D I?ILITY LOCATIONS SHOWN HEREON ARE BASED ON ABOVE GROUND SURFACE INDICATORS, AND AS -BUILT UTILITY RECORDS. ADDITIONAL UTILITIES OTHER THAN THOSE SHOWN MAY EXIST ON THE SITE. B. THIS DRAWING IS BASED ON FIELD SURVEY PERFORMED IN AU50ST 2013. ALL SURVEY CONTROL NOTED AS FOND WAS RECOVERED IN AUGUST 2013 UNLESS O7HERINISE NOTED. 9. ALL DISTANCES ARE SHOWN IN GROMD SCALE FEET. SURVEY REFERENCES I. COMMITMENT FOR TITLE INSURANCE PROVIDED BY 5TEWART TITLE ORDER NO. 01148-13048, ETTEOTIVE DATE. MARCH 15, 2013. 2. SURVEY RECORDED UNDER AUDITOR'S FILE N7. 200110106900011 3. SURVEY RECORDED UNDER AUDITORS FILE NO. 200550628900001 4. PLAT OF ROBBINS' VIEW TRACT ADDITION TO RIVERTON RECORDED IN VOLUTE 17 OF PLATS, PAGE 90 RECORDS OF KING COUNTY. 5. BOUNDARY, TOPOGRAPHIC AND UTILITY SURVEY BY HARSTAD CONSULTANTS. (SEE SURVEY NOTE 11 r. ECE1\/ED /PR 292014 SCALE: 1"=20 FEET 0 10 20 40 HATTON GODAT PANTIER ENGINEERS AND SURVEYORS 3910 MARTIN WAY E, SUITE B OLYMPIA, WA 98506 TEL: 360.943.1599 FAX: 360.357.6299 asa hattonpantler.com 13-039