EXH0406021854

January 14, 2002 Ke,_L.sto=,lllorno.r ,J,! I, en" EMAIL: kstock_helsd qmq DIRECT DIAl' 206-689-2182 Hand-Delivered - Urgent Col. Ralph Graves ..F.xI,_Jt /"_lU _0Ms. Muffy Walker £ Ms. Gall Terzi Ca:a ,tl_ U.S. Army Corps of Engineers v,..:_ss_ Seattle District _'._-..-,'_,'tsccu,,tRe_orter P. O. Box 3755 Seattle, WA 98114-3755 } Re: Corps Ref. No. 1996-4-02325: Port of Seattle Third Runway and Related Master Plan Update Projects: GeoSyntecComments on Geotedmical Summary J_eport, Third Runway Embankment Fill and West MSE Wall, Seattle Tacoma International Airport Project, by Hart Crowser, Inc., dated 4 November 2001 Dear Col. Graves. Ms. Walker and his. Terzi: Attached please find comments by GeoSyntec Consultants related to Hart Crowsefs November 2001 "Geotechnical Summary Report; Third Run6/ay Embankment Fill and WestMSE Wall, Seattle Tacoma International/a'rport Project." Please include these comments in the Corps' record el decision on the Port's application; the'original letter is being mailed to you directly from GeoSyntec. Geosyntec's review discloses that the Port has now radically revised its construction approach, opting to excavate up to three million cubic yards below the proposed MSE wall location instead of using in situ ground improvement, as was previousty.proposed to m_nimize impacts to Miller Creek and adjacent wetlands. This massive excavation and replacement create the potential for sisnificaht TheNovember2001HartCrowserreportacknowledgesthatone-hundredstonecolumns . wereinstalledon thesitetotestwhethertheiJtsituapproachwouldwork,buttheresultsof thattestingwerenotincludedinthereporLApparently,however,theresultswere unsatisfactory,resultinginthePort'sswitchtothemassiveexcavationnow proposed.ACC hasaskedthePorttoprovideuswiththeactualresultsofthestonecolumntesting.The " Port's"test"raisesseriousq_bstionsaboutwhatharmwascausedwhen thePortinstalledone- hundredstonecolumnsatthesiteo[protectedstreamsandwetlands.ACC.ursentlyrequests thattheCorpsinvestigatethisandverifythatnoCWA violationsoccurredasaresultofthis testing,priortoanydecisiononthePort's§404application. IS00 I_[.IGET $0UNO PL..ZT.A 13Z._FOURfH _',tfNOE SEA£[[.I_, 'HA 98t01.2509 P0 BOX _'lg46 sEAr_E,wA "_m-,_8_s PFI IZOBi 2_Z IiJ4 FX tZ06] 340 0_2 EM_,IL, hle/neqsel[ coqu, *% AR 021854 Col. Graves/Ms.…

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PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]