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Page 2 <br /> Ms. Mary Meays <br /> October 9,1991 <br /> Water samples collected at the site were tranSAt the laboratory, hequoia l samples <br /> Concord, California under chain of custody. <br /> were analyzed according to the following test procedures: <br /> • Total Petroleum Hydrocarbons as Gasoline -- EPA Method 8015-M; <br /> • Benzene,Toluene, Ethylbenzenes o,,d Xylenes (BTE&X) .- EPA Method <br /> 8020; <br /> • Organic Lead--DHS Specified Method; and <br /> • EDB --DHS Specified Method. <br /> findings from the laboratory testing are summarized <br /> The attached. QA/QC in q'abroc dares <br /> Laboratory reports and chain <br /> nsample label led 00 from well MW-3, <br /> consisted of collecting a duplicate <br /> collecting a field l blanks ndiated a laconstituents el hlank, analyzed for�were <br /> duplicate and sample <br /> below detection eif followed. <br /> At.the laboratory, standard internal QA/QC <br /> procedures we <br /> Plotting and contouring ground water level contours (Figure 1)indicate a <br /> flow direction toward the southeast. Previously, <br /> flow directions were <br /> toward the southwest,the change in flow direction may be due to the <br /> influence of tidally induced water level changes in the adjacent Stockton <br /> deep water channel. <br /> entration of <br /> The laboratory findings generally indicate a decrease inin en ecof organic lead <br /> petroleum and petroleum related compounds. The p previously. <br /> EDB was <br /> was not detected in this quarter nor was it detected <br /> analyzed for in the third quarter, but was not detected. <br />