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ENVIR MENTAL HEALA DEPARTMENT <br /> PaU,N SAN JOAQUIN COUNTY <br /> Donna K.Heran R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> '• p • Program Manager Douglas W.Wilson,R.E.H.S_ <br /> FORa Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> r - <br /> Mark Barcellos,R.E.H.S. <br /> DALE BOYETT <br /> BOYETT PETROLEUM <br /> P O BOX 576277 <br /> MODESTO CA 95357-6277 <br /> Re: BOYETT PETROLEUM Site Code: 1433 <br /> 419 S. MAIN ST. <br /> MANTECA CA 95336 <br /> f <br /> This is.a memorandum of the telephone conversation on August 25,2003 with your <br /> consultant, Condor Earth Technologies,Inc. (Condor). Condor stated that because the <br /> screen section of MWA extends below the clay layer located at approximately 25 feet below <br /> surface grade (bsg),it connects two separate sand zones and may be a potential conduit for <br /> cross-contamination. Condor is in the process of drafting a work plan to replace MW-1 as <br /> originally directed in the letter dated May 29,2003 from San Joaquin County Environmental f <br /> Health Department(EHD). <br /> EHD recommends that submission of a work plan to replace MWA be delayed until the <br /> lateral and vertical investigation work as proposed in Additional Gtnundwater Investigation Work <br /> Plan dated June 25,2003 prepared by Condor has been completed, and the corresponding <br /> report has been reviewed by this office. Necessity of replacing MW-1 will be based on the <br /> new information on the vertical extent of the contamination in groundwater, the presence <br /> (or lack of) of the above-mentioned clay layer away from MWA,and if this clay layer <br /> actually provides significant barrier against vertical contaminant migration. <br /> DATED August 25, 2003 BY <br /> Cc: CRWQCB,Central Valley Region James L.L. Ba on, R <br /> fl. <br /> Cc. Condor Earth Technologies, Inc. —Lee H. Morse <br /> j <br /> it <br />