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k <br /> A <br /> • Y , <br /> $1MT1!OF CALIFORNIA <br /> CALIFORNIA REGIONAL WATER CBUAUTY C0�lTRGI, �GARD.� . <br /> REGION 060;101 0ruxMe,na11, <br /> CENTRAL VALLEY REnoir„w, <br /> U”11OLMER ROAD <br /> JACRAMENTO,cA 66627.30gs <br /> 28 September im <br /> PSI) <br /> fr�ks����'rkv•.- <br /> Ms. Diane Hinson <br /> ROgistered Environmental Health Special <br /> Environmental H041th Division ist <br /> San Joaquin <br /> PCounty Department of Public Health Services <br /> .B. Box 2002 <br /> Stockton CA 952ol <br /> FORMER EXXON SERVICE STATION. 9O9 id1:ST HAMMER LANE STO <br /> INVESTIGATION SAIL AND GR6I1Nf) WATER W ASS£ASMER AND'F CKTON, REPORT OF <br /> i ILIAL RENEDIATION <br /> We have reviewed the 25 n <br /> Ground Water and Finny R�mdiation9Planpart of Investigation 5011 and <br /> prepared b <br /> Science and technologyj. Inc. y astEngineering <br /> "1 and proposes continued I The report summarizes P investigations <br /> Period of ane year. quarterly monitoring of ground water for a <br /> I According to the report, <br /> has -diminished and the iXtenf ground rater contamination <br /> Portion of the i,,,,?roundBr intercepted by MW-3.contamination is n0�► confined to the <br /> above report and other information in our. f,IBasSed an aur review of the <br /> 'these conclusions can be verified with the existsn monitoring t <br /> � Three of the an-efts wells ora nit � we do not believe that <br /> for -abt4lning valid crater quality samp�es.ar conta�n insufficient water <br /> Water Sam les obtafnad from MW-�3 contilluo to Shaw high levels contamina sun. According to the report, the of benzene <br /> canafstently toward MW-2 which would detect an contaminants Pram mi hats been <br /> In that direction. Howevor, because monitoringNW-2 Y migrating <br /> deeper aquifer cone than_ IWR3 and--the water level in->H <br /> - <br /> —significantly lawor than in the other wa]ls� th gradlenEcreened in a -- --- <br /> - --- <br /> may not be valid. It is difficult to evaluate the possfbles <br /> uming In nearby preduction wells on water leve] interpretation <br /> ewer 2A feet of this well were apparentl to effect of <br /> OnIyy sin MW-2 because the <br /> Wel <br /> Yalid gradient determinations can orilYgl�a derived <br /> cuttings <br /> wa]ta which 4118 screened <br /> in the qd from man <br /> same hydrologic unit. sEoring <br /> �i reported unlikely thilt the high levels of <br /> E <br /> . . ,. ground water during hydrocarbon contamination <br /> or been si"gr:ificsntly dearadedg previous <br /> invests 4tions have disappeared <br /> concentrations of hydrocarbons may be attributedto <br /> PParent reduction In the <br /> a number of factors <br />