Laserfiche WebLink
i.o iyTkont�cTio� <br /> Thr l3ocing Campany (13ocinel, unJcr an Agrccd Ordcr (No. DE-96115•h27a and subscyucm <br /> amcndments) «iih ihc �Vashington Siate Depanmen� of GcoloE� IC-cology), is responsible for the cicanup <br /> of a trichlorocthene (fCC•) plumc c�tending nonh uf [3oeinc s stonmrarer dctention ponds ai thc <br /> hcad��aicrs of Powder �fill Creck uithin Po�eJer �4i11 Gulch IPh1Gl in ihc ci��� of 1?ccrcu (Cii}1. <br /> VVashington. l'hc plumc cstcnds omn parccls 2R(W030030Q500 and 2R041000100200 (buth ou�icd bp <br /> Boring), locaicd soulh of Scaway I�oulc�ard and nonh of Ihe Bocinc I:�crcu plant IFigurc Il. :\s an <br /> inirnm cicanup action. l3cxing is proposing�o ins�all a remcdial sys�em Io c�tract and Ircal contaminnicd <br /> LRowid�ca�cr �rom ihc plumc bcncath thcsc h�o parcds(proposcd prcijccl). <br /> ln accordance w'ith Icderal, state, and local rcyuiremenls (descnhed beloul, Landau Assuciates <br /> perfornicd a ciitical ;ucas siudy w�iihin thc proposcd projcn arca to as<isi 13ocin� in dc�cmiining poicnti��l <br /> impack to ue�lvids and other "��a�ers of the U.S."and Iheir hufferti. "t his repun docimieni. the re�uhs of <br /> ihat stuJ}�and prescnts proposed miiiEauun �o he u�ken to minimize these nnpacis. <br /> I.1 PRO,IECT DtiSCRIP'1'ION <br /> TC[ �vas �irst dc�cctcd in I'\iG ground��atcr m \t;irch 20Ui. BascJ nn initial siic <br /> charxicn7uiun ac�iviiics. thc TC:f: snurce area was idcntificd as an appro�imotcl}� 14.000 syuare foo� <br /> (frl arca ccntcred hrlo�c ihc dccpcsi ponion of a dcicntion h�isin ai thc head uf I',�1G. A punion of thc <br /> plumc dischargcs �o Puu�drr \lill CrccA appruzimately 2�)0 (rei Ui) north ol ihe d�tcnlion basin uhcrc <br /> P���edtr \lill Creek hccomes a perennial Lainmg strcam. r\n IA «as complctcd m 20n�i u� rcduce I'('I' <br /> cnncenlntions m Ihc si�urcc arc;�: ihr prnpo�cJ I:1 i. G�r «ducing 'I('li conccninuans in thc <br /> du�cngradicnl area. <br /> lhc IA fur Ihc do���ngr:idicn� plumc :vcn ot� I'\1(i is dicidcd into nco phatic�: thc �irsl phasc <br /> 1 Phasc 1) aJJnsscs thr plumc suulh uf Sca��ay Ruulc��ard anJ Ihc scconJ phasr (1'hasc 21 ;�Jdrcstits Ihc <br /> plumc norlh o(tica��;i�- Ruulc�:�rd. l�hc prop��scd prolcci is lintucd ��� I'hasr I onh'. �I�hr objccli�'cs of <br /> Ph��sc I incluJc: <br /> • Lsuihlish h�drauGt containmcnt and prc�cni timhcr mi�rmiun. In thc ma�imum c��ent <br /> practicablc, of chlorin:ucJ sol��cnt-cuntamina�cd grnund�catcr bc}�ond tica�ra�� Hoidcvard anJ <br /> afl lioeing properl}'. <br /> . Rcducq �u �hc ma�nnum c�tcnl prac�ir,iblc, mi�ra�ion ul chiurin;ncd .,��hcnl-contanunntrJ <br /> grounJuatcr tu thc surfacc watcrs of 1'u�cdcr Aiill Crcck. soulh ul Sc:re:n Bouiccard. <br /> The prupused Phuse I IA rnnsis�t of a grom�d�catcr eetruction und trcalmenl IGI:T) systcm �hnt <br /> �cill estahlish capture zoncs for liydraulic cnmrol. 7'hc GL=T scs�cm will includc ihrec �rouodw;�lcr <br /> c.�traclion wclls.a �ounduatcr Ircalment syslcm cunsisling of an air sinpper containcd uilhin a InaUncn� <br /> ;^in1 r�oz�nn_���rcxrtma�weoe�a�+r;.5.x+a�V'�.�r.na�rv,�-,p[�o.ru u-ae�. v.:1:i s�. .ra,.;,.[nva:.: LeNDeUA550Ci4TE5 <br /> � � <br />