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California Regional Water Quality Control Board • Centrad Valley Rl�ton Rabert Schneider, Chaw Gray Dzm >�v Q a HIcitax - seawa y for saermuen to Mans Office Gavcrnor k wmMuma1 Int=ct Add=er. httPl/www s .ra�++k�q� Preexrlan 3443�%==Road.Salta A,S==n=ta,Cabfa=9582730M Pba a(916)255-3000-FAX(916)2.55-3015 13 June 2002 Mr.Dale Gillespie Gewelm Land Develepmeat and Nig PO BOX 1210 Lodi, CA 95241 REYLEW CONE PENE 2CAJIF R 7MY7:BVG REPORT ADDENDUM—MAY 2002, GEWEXE PROpEBTP, 16 So= OEEE L&NE,LDDI,SAN JOA QIMV CDUIVTY, CLEANUP AND ABAMd=OEDER (CAA) NO. 93:-701 Board staff reviewed the 24 May 2002 Cane Penetrometer Temng(CPT)Report Addendum-tiday 2002 (CPT Addendtma) subtrntted by Advanced GeoEuvlronmeatal,Incorporated(AGE) on behalf of Gewckn- Laced Development and Markettng(Geweke). The CPT Addeadum.was prepared to address commcz=subtmtted ua our leiter dated 24 April 2002. The CPT Addendum presents the following: • A discussion of petroleum impacted soils ertcrnmtered from two to four fest m CPT barmg C 2T-2, A dlseusston of total petrolem n hydrocarbons as gasolene (TPHg) ldcaiafied m groundwater grab Samples; • A revised geologic cross secton with Ilthology and well corrzpletton data from mon well EW 1 and momtormg wells MW-8 and MW-12, and • Aeco>meadatt:ons to prepare a work plan for mstallatton of clustered momtor=g wens downgraciaetlt of the site. As preseztted m the Cane Penetrometer Te=g.Report-Deeernber 2001 aced the CPT Addendum,AGE ldca cd three hydrQstmttgrapinc amts at the subject slte. Umt 1 extends from 45 to 65 frit and mcludes sand and muter Wt lenses,Umr 2 ends from 65 to 95 feet and mcludes predonmimitly sand and gravelly sand leases,and Umt 3 extends from 95 to 140 feet and mcludes predominantly silt vnth mmcr sand lenses. The water table bas Ejuctuated between 55 and 80 feet between 1986 and 2001, and it is cummndy at approximately 55 feet m Unit 1 TPHg was identified m CPT gro;mdwatcr grab samples from muittple mtervals=gmg zee depth from 72 to 134 feet(Units 2 and 3), and bes=ue was only detected m hydrustratfgmgkuc Unit 2. Therefore,based m tins added mforxnattoa,AGE proposes to prepexe a warkplan to msiail two mozntofmg well clusters tae verify the lateral and vertical extent of groLmdwater caniautinatton downgra&ent of the sate Two well s==mt=vals are . proposed near momrtormg well MW-8, and du=well screrai mtervals are proposed near C.PT-3 One well will be completed m Unit I at 50 to 70 feet, two wells wi3i be completed m Unit 2 at 75 to 80 fleet and 80 to 90 feet, and CaWornza Exvirenmentd Protection AgexL7 0 swyda rvw The eat ch&U=ge&cmg Calif m as n=L Every Calixmaa needs to taloa um2ediate a=an w reduce Pu-