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n County of San Joaquin Publicl`Health Services 4 � <br /> .April 4, 1990 (881680) E"> <br /> Ground water sa4les were collected from four locations:: 1). House <br /> Well into 14:: 2). Well .No. 5338, 3) Well No. 5298•, and 4=) Well No. 5272:.. Locations <br /> ; .are: illustrated. :on Plate '1 - Site Map, The chilled ground water samples were <br /> hand-delivered accompanied by chain-of-custody documentation to Coast to Coast <br /> Analytical Services.. Inc in° Goleta, California, where they were analyzed for <br /> HTEX .and TPH by EPA me:thord '524.2' and for total lead by EPA method 742:0 fol ;owing <br /> digest'3.on by EPA.. method 30%. The laboratory analytical results are presented <br /> in Table 2.. - Analytical .Results, of Ground Water Sampling. <br /> A11 our wells +coi twined brace amounts of benzene and three c"gtined <br /> t h Grace amounts of toluene.. Both..constituents were present in dobmi#tratiqns rdEti.LI <br /> I <br /> elow the applicable State of California Drinking Water Standards. <br /> It is our opinion the ground water contamination has been caused by <br /> a source other than the UST. This was based on the fact that benzene was :found. <br /> i:n the ground water s.amrples, .abut not in the confirmatory rmatory s:oil..somp.l,e.s collected; <br /> from the tion and because several of the wells c:.o..nta:ining. .benzen are: <br /> located upgradi.ent of: the: removed UST. - <br /> Prior to: field 'activities of January 9, 1990, ;$00 conducited a <br /> ir'sstr1.ct9d 104rovey of the properties surrounding the site which may contain USTs.. <br /> SCD learned that two site which reportedly use USTs exist: north of the Color: <br /> Spot site. Reportedly sevih USTs exist at 5401 East Harney. Lane, Bailey's <br /> I Nursery and one UST is locat d at the cemetery located at the .northeast corner <br /> of Highway 99 and East S3a:rney Lane.. It should be noted that each :.Of. these <br /> surrounding properties are apparently located hydrologically upgrad :ent :af the <br /> j The believed upg`rad enc UST site 'located at 5401 East Harney Lane, <br /> which reportedly contains as[,many as seven USTs, may be: .a source of the benzene <br /> contamination. Given :the fact that diesel fuel typically contains less than 0.20 <br /> :percent benzene and that not even trace concentrations of Benzene have been found <br /> in any soil samples collected at the site, we believe that benzene contamination <br /> of the ;ground water wells caused by the Color Spot facility is highly improbable;. <br /> i <br /> For the ,above rea}sons, SCD strongly believes that Color Spot, Inc;. <br /> should not be required to implement a ground water investigation and that PIIS-EHD <br /> ;should investigate other possible sources of the benzene contamination. SCSI also <br /> recommends that the previously suggested quarterly well monitoring program (Soil <br /> Vapor Study, Color Spot, Lodi; California, October 1989) to be conducted by Color <br /> ;Spot be discontinued:. ? <br /> I .� .:CL05tTRE <br /> We believe that ill the requirements imposed on],C0lor Spot... Inc. in, <br /> ; <br /> the letter from PHS-EHD, dated January' 17, 1990, have been satisfied:or: responded <br /> 'to.iu a zeasonable mannet. If you wish to discuss any of the responses: contained <br />