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Home My WebLink AboutTAL-1952 Unico Longacres Existing Conditions ATTACHMENTS ONLYMs. Jill Ding 29 April 2022 Page 23 of 38 Attachment: Figures, Talasaea Consultants Inc., 2022 Attachment 1: Chronological Photo Documentation, Numerous Sources & Dates Attachment 2: Full List of Background Materials Attachment 3: City of Renton Jurisdictional Wetland Determination for Longacres Park Development Project, Shapiro, and Associates Inc., 1992 Attachment 4: Existing Habitat Conditions and Wildlife Study Report for the Longacres Office Park Project, Shapiro, and Associates Inc., 1993 Attachment 5: City of Renton Jurisdictional Wetland Determination for Longacres Park Development Project, Shapiro, and Associates Inc., 1998 Attachment 6: Longacres Office Park Surface Water Management Project and Conceptual Mitigation Plan, Shapiro, and Associates Inc., 1998 Attachment 7: Revised Longacres Office Park Surface Water Management Project and Conceptual Mitigation Plan, Shapiro, and Associates Inc., 1999 Attachment 8: Drainage Report for Conceptual Drainage Plan for Longacres Office Park, Sverdrup Civil Inc., 1998 Attachment 9: Biological Assessment and Critical Areas Study, Terracon Consultants Inc., 2015 Attachment 10: Wetlands Delineation and Regulatory Analysis Memorandum, Amec Foster Wheeler, 2016 Attachment 11: Delineation of Wetlands and Other Waters, NV5, 2021 Attachment 12: 2003 Binding Site Plan Attachment 13: 2005 Binding Site Plan Attachment 14: Wetland Determination Data Forms, Talasaea Consultants Inc., 2022 Ms. Jill Ding 29 April 2022 Page 24 of 38 FIGURES TALASAEA CONSULTANTS, 2022 Figure 1. Vicinity & Driving Directions Figure 2. Parcel Map Figure 3. Existing Conditions Figure 4. 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Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 2: 1990 Aerial, Google Earth Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 3: 1998 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 4: 2000 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 5: 2002 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 6: 2005 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 7: 2007 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 8: 2009 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 9: 2012 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 10: 2013 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 11: 2015 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 12: 2016 Aerial, Google Earth Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 13: 2017 Aerial, King County iMap Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Photo 14: 2021 Aerial, Google Earth Ms. Jill Ding 29 April 2022 Page 26 of 38 ATTACHMENT 2 FULL LIST OF BACKGROUND MATERIALS, GENERATED BY TALASAEA CONSULTANTS INC., 2022 Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 1. City of Renton and Boeing Customer Service Training Center Agreement, 1992 2. City of Renton Jurisdictional Wetland Determination for Longacres Park Development Project, Shapiro and Associates Inc., 1992 3. Existing Habitat Conditions and Wildlife Study Report for the Longacres Office Park, Shapiro and Associates Inc., 1993 4. Longacres Public Notice of Application For Permit, U.S. Army Corps of Engineers, 1994 5. Longacres Final Environmental Impact Statement, Jones & Stokes Associates Inc., 1995 6. Longacres Environmental Impact Statement Mitigation Document, City of Renton, 1995 7. City of Renton Jurisdictional Wetland Determination for Longacres Park Development Project, Shapiro and Associates Inc., 1998 8. Longacres Office Park Surface Water Management Project and Conceptual Mitigation Plan, Shapiro and Associates Inc., 1998 9. Drainage Report for Conceptual Drainage Plan for Longacres Office Park, Sverdrup Civil Inc., 1998 10. Longacres Permitting Memos and Permits Reference 93-4-00059, U.S. Army Corps of Engineers, 1999 11. Revised Water Quality Certification for Corps Public Notice #93-4-00059, Washington State Department of Ecology, 1999 12. Revised Longacres Office Park Surface Water Management Project and Conceptual Mitigation Plan, Shapiro and Associates Inc., 1999 13. City of Renton and Boeing Development Agreement, City of Renton, 2000 14. Renton City Council Regular Meeting Minutes June 24 2002, City of Renton, 2002 15. Boeing Longacres Binding Site Plans, W&H Pacific, 2003 16. Boeing Longacres Binding Site Plans, W&H Pacific, 2005 17. Resolution No. 4078, City of Renton, 2010 18. Biological Assessment and Critical Areas Study, Terracon Consultants Inc., 2015 19. Wetlands Delineation and Regulatory Analysis Memorandum, Amec Foster Wheeler, 2016 20. Certificate of Exemption from Shoreline Substantial Development Project Number LUA16-000727, City of Renton, 2016 21. Delineation of Wetlands and Other Waters, NV5, 2021 Ms. Jill Ding 29 April 2022 Page 27 of 38 ATTACHMENT 3 CITY OF RENTON JURISDICTIONAL WETLAND DETERMINATION FOR LONGACRES PARK DEVELOPMENT PROJECT, SHAPIRO, AND ASSOCIATES INC., 1992 Ms. Jill Ding 29 April 2022 Page 28 of 38 ATTACHMENT 4 EXISTING HABITAT CONDITIONS AND WILDLIFE STUDY REPORT FOR THE LONGACRES OFFICE PARK PROJECT, SHAPIRO, AND ASSOCIATES INC., 1993 Ms. Jill Ding 29 April 2022 Page 29 of 38 ATTACHMENT 5 CITY OF RENTON JURISDICTIONAL WETLAND DETERMINATION FOR LONGACRES PARK DEVELOPMENT PROJECT, SHAPIRO, AND ASSOCIATES INC., 1998 Ms. Jill Ding 29 April 2022 Page 30 of 38 ATTACHMENT 6 LONGACRES OFFICE PARK SURFACE WATER MANAGEMENT PROJECT AND CONCEPTUAL MITIGATION PLAN, SHAPIRO, AND ASSOCIATES INC., 1998 Ms. Jill Ding 29 April 2022 Page 31 of 38 ATTACHMENT 7 REVISED LONGACRES OFFICE PARK SURFACE WATER MANAGEMENT PROJECT AND CONCEPTUAL MITIGATION PLAN, SHAPIRO, AND ASSOCIATES INC., 1999 • longocres Office Park Surface Water Management ?roiect Conceptual Wetland Mitigation Pl'Jn Prcpcreci for : Boe ir.g Commercia l Airplone Gr,;,up P.O. Bex )707 Sea tt le, WA :18124-2'.'07 Shapiro or,d A.ss oci otf;!s, In ·.:. 10 1 Yesler Way, S1Jite ,100 Sea ttl 0 \.YA. 98 ~ 04 DecetTil:,€r i 998 o · d · 1 woo :s.ev1sc~ Jam1cr; . , . r r [ r [ [ l [ l l. l l [ [ TABLE OF CONTENTS Page SUI\IIMARY ................................................................................................................................... 1 1. 2. 3. 4. 5. 6. INTRODU CT ION ............................................................................................................ 6 1.1 Project Descript ion ................................................................................................... 6 1.2 Summary o f Wetland Impacts, Avoidance, and Compensation ............................... 9 1.2. l Wet land Impact s ........................................................................................... 9 1.2.2 Wetland Impact Minimization ...................................................................... 9 1.2.3 Compensatory Wetland Mitigation ............................................................... 9 WETLAND REGULATIONS ......................................................................................... 9 2.1 U.S. Army Corps of Engineers ................................................................................ 9 2.2 State Environmental Policy Act. ............................................................................. 11 2.3 Cit y of Rent on ........................................................................................................ 11 CONCEPTUAL MITIGATION PLAN ...................................................................... 11 3.1 Goals , Objectives, and Des ign Criteria ................................................................... I I 3.1. l Goal s .......................................................................................................... 11 3.1.2 Objectives ................................................................................................... 11 3.1.3 De sign Criteria ............................................................................................ 12 3 .2 Planned Habit ats ..................................................................................................... 14 3.2 .1 Open Water Pond ....................................................................................... 16 3.2.2 Stonnwater Pond ........................................................................................ 16 3.2.3 South Mars h ............................................................................................... 16 3 .3 Impl ementation Considerations .............................................................................. 18 3.3.1 Con st ruction and Planting Seque nce ........................................................... 18 3.3.2 Sources of Plant Material.. .......................................................................... 18 3.3.3 Soil Amendment/fopsoil ........................................................................... 18 3.3.4 Constmct ion Observation ........................................................................... 18 3.3.5 Watering ..................................................................................................... 19 3.3.6 Land sca pe Maintenance .............................................................................. 19 PERFORMANCE STANDARDS, MONITORING, AND CONTINGENCY .................................................................................................. 19 4.1 Performan ce Standards ........................................................................................... 19 4.2 Mo nitorin g .............................................................................................................. 21 4 .3 Contingency Pl a n .................................................................................................... 22 LIMITATIONS OF THIS REPORT ........................................................................... 24 REFERENC ES ................................................................................................................ 25 Boeing Longacrcs Of li ce Pnrk Conceptua l We tland Miti g:rnon Plan I /18/99 r r f [ r TA BL E O F C ONTENTS (continued) L is t of Tables Tab le 1: We tl a nd [mpac ts and Proposed Compensation ........................................................ 9 Table 2: M itiga tio n Goa ls, Methods, and Perfo rmance Standards ....................................... 12 Table 3: P roposed Plants for Mitigat io n ............................................................................... 17 Table 4: Con tinge ncy Pla n .................................................................................................... 23 List of F ieures Figure I : S ite V ici nity Map ...................................................................................................... 7 F igure 2: Site W e tl ands ............................................................................................................ 8 Figure 3: W e tl a nd Im pacts and Mitigatio n ............................................................................. 10 Figu re 4 : Co nceptu al Wetland Mit iga ti on Plan ...................................................................... 15 Figure 5 : Co nceptua l Mitigat ion Pla n Cross-sec tio nal View A .............................................. 20 APPENDICE S Ap pendix A: Juri sdi cti onal Wetland De te rmin at ion fo r th e L ongacres Office Par k ( 1987 Manual) Appe nd ix B : Corps of Engineers We tl and Ve rificati o n Le tt er ( 1998) Ap pendi x C: L o ngac res Office Park Exis tin g Habita t Co nditi ons and Wi ldli fe S tu dy Report Ap pe ndix D: Existing a nd M iti gati o n Wet l ands Boeing Longacre~ Ollicc Park Concep tual W etl and Miugauon Pl.in II 1/18/99 r r r l [ l l l l [. SUMMARY Introduction The Boe in g Co mpany is co ns tru c tin g th e Longacres Office Park (LOP) in Renton, Wa shing to n (Tow ns hip 23N, Range 4E, Sections 24 and 25). Because de ve lop me nt of th e Surface Wat er Management Plan (S WMP) for LOP wi ll affe ct about 3 acres of wetland, a mitig a tion plan has been formulat ed to achieve no net loss of wetland area or function. Approxi mat e ly 14 acres of wet land are loca ted on s ite. Construction of th e office park would entail fillin g 1.4 acres of wet land wit h res torati on and/or creatio n of 3.3 acres on s it e and creation of 1.5 ac res off site. Th e miti gation plan proposes to prov id e a total of 4.8 acres of high quality wet lands throu gh excavation of existing uplands and re storation of di s turb ed or previ o usl y tilled wetlands; ex cavation and replacement of exotic plant species; and the preservation of 10 .9 acres of existing wet land s . The final result would be the creati on, restorati on and pre se rvation of 15 .7 acres of onsite wet land areas . Completed project wetland s will ha ve s ubstantiall y greate r functi onal va lu e tha n th ose curren tly on site. The 164 -acre LOP s ite is located o n the former Lo ngacre s Park thorou ghbred horserac in g track site. The north ernmost 5 1 acres of th e original 2 15-acre ra cetrack site previou s ly were developed as the Boein g Cu s tomer Services Training Center (CSTC). W e tlands on th e CSTC site wer e altered under the auth ority of a Clean Water Act Nationwide Permit Number 26 issued in I 992 . Consistent with the preferred altern ative LOP Mas ter P lan that is th e subject of an enviro nm ental impact statement iss ued in 1994 by the City of Renton as lead agency , the Family Care Center (FCC) and Boeing Commercial Airplane Group Head quarters (BCAGHQ) have rec ently been comp leted on the LOP site. Objectives Miti ga tion goals formulated to ac hieve no net lo ss of wet land are a and function have bee n developed to offset the anticipated wetland impacts resu lt ing from co nstruction of the LOP. In addition to meeting the requirements of applicable regulations, these goa ls take into accoun t ex is tin g topography, wat er sources, vegetat ion , soil s, and restorat io n pot ential for the wetland s; th e appropriateness of variou s mitig ati on tech niqu es ; and the function s norm ally associated with se aso nally inundated emergent mars h, scrub -s hrub , and forested wetland systems. Based on assessmen t o f the s it e and th e proposed deve lo pment, the functions that appear to have th e greatest pot e ntial for res toration a re wat er qual ity enhan ce ment, sto m1w a ter stora ge. and wil dlife habitat. The s pe c ific obj ectives of the miti ga tion plan are: (I) Lo improve the quality of water lea vin g the LOP and CSTC s it es and ent e rin g Spr ingbrook Creek ; (2) to increase stormw ater storage capacity o n Lh e s it e; (3) to crea te, res tore, and/or enhanc e habitat for wi ldl ife; and (4) to create an aesthetically pl eas in g environment for e mpl oyees and c li e nts of the Boein g Company Approach A four-phase approac h wa s used to develop a mitigation plan for th e LOP Sile . Phase l wa s an eva luation of exis tin g site co nditi ons. Th e eval ua tion con s is ted o f Lhe fo ll ow in g: delineating wetlands on th e s ite (usin g th e Corps of Engin eers Wetland s Delineati on Manual , Environm ental Lab oratory , 198 7); co nductin g a co mp re hens ive analy sis of wildlife habitat s and use of th e s ite ; and measuri ng o f wate r q ual ity and quantity on the si te and in nearby Springbrook Cree k. Boeing Longacres Office P::irk Conceptual We tla nd Miu gation Plan 1/18/99 r [ f I [ l [ l l l l L L Phase 11 assessed the impact deve lopme nt of th e LOP Master Plun wi ll hav e on the wetlands, ba sed on infomiati o n ga th ered in Phase I. Wetland s that will be direct ly affected (i.e., filled ) by development , restored, and not affected were identifi ed. Th is inform ation was th en use d to eva lu ate im pacts o n the function of th e we ll ands and wild li fe habitat. The thi rd phase of Lh e project deve loped measure s to miti ga te for the impact on we tl and s as a res ult of de ve lopme nt. The goa l of th e mitigation plan is to c reate or restore g reater fun cti on lo the wetlands than was previou sly pre se nt. Excavatio n o f existing upland areas an d rep lanting with we tl an d species wi ll result in th e creatio n of new we tland areas. A tota l of 3.3 acres will be created and res to red on the SWMP s ite. The mitigation plan (a portion of th e overall SWMP) inv olves creati on and res torati o n of 3.3 acres of wetland on site, th e preservation of L0 .9 acres o f existin g wetlands, and inc ludes creati o n of an additional 1.5 ac re of wetland on the adj acent CSTC prope rty in 1993. This 1.5 acre area on the CS T C property was co ns tru cted as wet la nd during cons tru c ti on of the CSTC project, bu t was neither id e ntifi ed nor in c lud ed as part o f th e mitigation we tl a nd fo r CSTC. It is common ly referred to as th e "rese rve area." The crea ted and restored we tl ands w ill re sult in a greme r d iversity of wildlife habitat throug h es tabli shm ent of d iverse vege tati on com muniti es on si te and mainte nance of a corridor to co nn ec t offs ite habitats. Th e crea tion of open water wetland ponds also will prov ide greater on site capac it y for sto rm a nd floodwater storage . The final ph ase of the p lan assesses th e result s o f the mit igatio n e ffo rt. This is accomplished by co mparin g th e ex istin g wetlands to those proposed, determining th e vegetative and hydrologic c har ac teri sti cs that will be cre ated, and co mparin g the functions of th e predeve lopment wetlands with tho se of th e wetlands created as compensatory mitigation. Thi s assessment indic ates that wetland fun c ti ons c reat ed o n sit e will be grea ter th an th ose presently id e ntifi ed o n the sit e. Evaluation of Existing Conditions Eig ht wetlands (A, B , G , H, I, J, K, and L) we re id entifi ed in the LOP proj ec t area in 1993. These wetlands were redelin ea ted and the new de lin ea ti on re port was comple ted in 1998 (Appendi x A) They are ge nerall y sma ll depression s a nd drain age ditc hes within the lawn and open field areas of the project sit e. The 1993 wet land repo rt identities three se parate areas for Wetland H , three separa te areas fo r We tla nd I, and two separa te areas fo r Wetland L. For clarity of discu ss io n, the 1998 draft wet land report identifies th e separa te wet land areas as HI , H2, H3, l I , !2, I3, LI , and L2 , respective ly. In add iti o n, the I 998 draft report divid es Wetland K in to two pa rt s, Ka and Kb , at an ex isting access road from th e prac ti ce racetrack on the in fie ld. The 1998 wet la nd de lin eation report was submitted to the Corps for review and co nfinnation of jurisdictional wet lands . Following the Co rp s s it e visit and we tl and confimiati on inspec ti on, areas identifies as 12, I3, L2. and Ka were detennined to be non -jurisd ictional. The resulls of the 1998 Corps rev ie w are prese nted in Appendix B . Wi ldlife use of the LOP site was assessed tlurin g three differe nt se aso ns and co nsiste d of both visual obse rvat ions and trappin g on si te in 1993. Resu lt s of the w il dlife habitat and use s tudi es arc fo un d in Appendix C. A cove r memo Lo the 1993 Wildlife Habita t Report discusses c hange s in habitats o n the si te in the ensui ng five years . Boe ing Longu c rc :. Oflkc P:1rk Co nc eptual Wetland Mit1 ga11on Plan 1/1 8199 6 I l l l l Assess Impacts Development o f the LOP SWMP project wi ll res ult in the fill of 1.4 acres or wet land and restoration and creation of 4.8 acres of wetland o n-and off-s it e, exc ludin g stormwate r ponds . Wetland impacts ge nerall y wil l occur in the central portio ns of the mail track a nd in the practice track. The large we tland in the sou the as t portion of the site (So uth Marsh) wi ll not be affected by development and will be placed wi thi n a conservatio n easement. A map id e ntifying existing wetland and proposed miti gati on ar eas is presen ted in Appendix D. Witho ut miti gat ion e ffort s, th e overall functi on of existing we tl ands o n s it e likely wou ld decrease in the future as a re s ul t of piecemeal fill ing and disturbance from uncoordinated development of the s ite and fro m co ntinuin g interruptions of hydrol ogic co nditions. S uc h a dec rease in wetland funct io n would no t me et th e goal of no ne t loss, o r th e Boeing Compa ny's objectj ves of increased stormwater storage, water qu ality e nh ancemen t, a nd wildlife hab it at diversi ty. It is for these reasons that the mitigation plan was developed to co mpen s at e for imp acts on we tl and s re su ltin g from developmen t of the SWMP. Mitigation Plan Mitigation wetlands wil l be expected to achieve a net gru n in wet land function s within three years, and to achieve substantially hi gher function s b y the end of th e five -year monitorin g period . Miti gation efforts should res ult in a subs tantial in crease in we tl and fun c tions on th e LOP site over existing conditions. The following descriptions o f design criteria include the overall des ig n objectives and design e le me nts intended to achieve th e stated goals. Provi s io n fo r Increased Water Qual ity Enhan cement Hi storic use of the site has had a negative impact o n water quality. Waler fl ow in g from the s ite prior to recent deve lo pm e nt did no t meet s tat e guide lines, as it had low dissolved oxygen levels , hi gh fecal co liform le ve ls, and hi gh sus pe nded solids content. S ub sequ ent to rece nt development, discharge water quality has improved . Several feature s have been in c luded in individual bui ldin g designs to reduce po tential wa ter quality i mpacts. These include th e fo ll owing: approximate ly twice the normal den s it y of cntc h bas in s in the parki ng areas; o il /water se paration tees in Lh e catc h bas in s; ca tc h basin s located o ff-line; wet vault se d ime nt trap s; and wet ponds (Be nso n, 1993). After the water flow s th rough the prim ary catch bas in and we t vault sys te m, it is directed to the wet pond. Water th en nows from th e wet pond to the mit igatio n area, through the ex istin g miti ga tion wet lands o n the CSTC site, and on to Sprin g brook Creek. The proposed SWMP wi ll create the combi ned wetpo nd/detention po nd necessary to me et wate r qual it y requ ir emen ts for future development on th e s ite. The wetpond/de te nti on pond miti gat ion will create or restore 2.15 acres of we ll and that wi ll provide tert iary water qualit y e nha ncement aft er flow s thro ugh catch basins, wet vau lt s and wet ponds. These we tland s assoc iated with the we tpond are not included as part of th e we tl and mit igation. 8oi!1ng Longncrc~ Offi ce Park C onccp1ual Wetland Mi11 g a11 o n Plan 3 1/18/99