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N%rJ: STLRNG110LOGIC R [:sau4ct:s , INC . <br /> 'M E.FRANCISCO nOCLF.ti'ARD,SUITE It ' <br /> SAV RAFAEL.CALIFORNIA 94901 <br /> 415,457.7595 FAX:415,457.8511 <br /> APR �a <br /> 3 April 1990 <br /> Jahn Randall <br /> Chevron USA <br /> 2410 Camino Ramon <br /> 3� San Ramon,CA 94583 <br /> Rc: Quarterly Groundwater Monitoring <br /> Sampled 18 December ?989 <br /> Chevron Service Station#94275 <br /> - Stockton,California <br /> .,: WGR Project#1-104.06 <br /> Dear Mr.Randall: <br /> This lett,..;lrepnrt presents the results of the groundwater sampling performed in Dccembrr <br /> 1989 by Western Geologic Resources,Inc (WGR)at&c Chevron scnice station #94275,located at <br /> ` � 2905 W.-Benjamin Holt Drive,Stockton,California(Figure 1). <br /> GROUNDWATER SAMPLING <br /> #':K• Wells MW-I through MW-5 were sampled on 18 December 1989 by WGR environmental <br /> teehniciaus according to the WGR standard operating procedure fer groundwater sai tpUng included as <br /> Attachment A. All purged water was collected and temporarily stored ch-site in holding tanks pending <br /> S' results of Lbvratory analysts. The groundwater samples and laboratory supplied travel blanks,made <br /> up of deionized water at the laboratory,were sent under chain-of-custody to Pace Laboratories,Inc. <br /> (PACE)of Novato,California. <br /> ANALYTIC RESULTS <br /> All groundwater samples,collected on 18 December 1989,were analyzed for total purgeable <br /> fuel hydrocarbons(TPFH),by EPA Method 8015 and b rtmne,toluene,c[hylbenzcne,and total xylenes <br /> (BTF_X)by EPA Method 8020. Additionally,a sample collected from well MW-'was analyzed for <br /> haloczrbons by EPA Method 8010. The analytic results are presented in Table 1. The chain-of-custody, <br /> form, laboratory mpnrts and quality assurance/quality control documentation are included as <br /> Attachments B and C. The distribution of TPFH and benzene in groundwater is shown in Figures 3 <br /> and 4,respectively. <br /> i� - <br />