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W <br /> s. <br /> s. p <br /> $ T l <br /> T <br /> y <br /> t1/Ut'f7'.1tI,Y htC)Nft'(71t1N(;IWPOW" SIiC()N1)c ts,�tt'I'1?tt U1'1rtt <br /> 7910 l,crvner Sacramento darted,Stcwkton,(%11ifornia <br /> ShdI WIC No,204.752441808 <br /> I)alta 1'rojeaa No.4n-M-147 <br /> fade 2 <br /> previous work performed by Delta includes investigation for petroleum constituents in the soil and ground <br /> water at the site,assisting in the replacement of the underground storage talks,quarterly water elevation <br /> sampling of ground water for laboratory analysis. The previous activities <br /> measurements, and quarterly <br /> performed at the site and results obtained are presented in the following reports prepared by Delta, <br /> Date <br /> R <br /> April 19,1988 <br /> Proposed Work Plan March 31, 1989 <br /> Phase I Hydrogeologic Assessment Work Plan <br /> April 6, 1989 <br /> Tank Closure Report October 20, 1989 <br /> Please 1 Hydrogeologie Assessment Report <br /> October 15, 1990 <br /> ProblemAssessment Report December 26, 1990 <br /> Quarterly Monitoring Report, Fourth Quarter 1990 <br /> Quarterly Monitoring Report,First Quarter 1991 April 8, 1991 <br /> 3.0 PRO F.CC RESULTS <br /> 3.1 Ground Water F.levntlon Data <br /> f'apths to ground water were measured at monitoring wells MW !, MSV-2, and MW-3 an May 8, 1991• <br /> in Table I. Using ground water elevation data collected during <br /> Ground water elevations are summarized <br /> the May 8, 1991,sampling event,the ground water flow direction was towards the northeast at a hydraulic <br /> map based on measurements collected on <br /> gradient of approximately 0.012. A ground water contour <br /> May 8 1991,is illustrated in Figure 3. <br /> 3.2 Grrnund Water Chemist <br /> Ground water samples were collected from monitoring wells MW-1,MW-2,andM h lbenzeneW-3 on May a d llenes <br /> xylenes <br /> were submitted to a California-certified laboratory for analysis of benzene,to Y <br /> (BTEX),and Iotal petroleum hydrocarbons (TPH).mbCao°i�eosnits o[�hc ground water ocations are shown samples collected <br /> igure 2.and <br /> the chemical results are presented in'Table 2. Ch <br /> on <br /> May 8, 1991, indicated that BTEX and TPH concentrations were below the analytical method <br /> d ucioAn. <br /> limits in all three monitoring wells. Copies of certified laboratory reports are resented in A pe <br /> Ground water samples will again be collected for chemical analysis of BTEX and TPH in August 1991. <br /> 4 <br /> p� <br /> »-eve•• <br /> I <br />