Laserfiche WebLink
t <br /> s <br /> MIN-110 # a <br /> N1s. Mary Meays page 2 <br /> Qctober 9, 1991 <br /> Water samples collected at the site were transfered to Sequoia Analytical, <br /> Concord, California under chain of custody. At the laboratory, the samples <br /> were analyzed according to the following test procedures: <br /> • Total Petroleum Hydrocarbons as Gasoline -- EPA Method 8015-M; <br /> • Benzene, Toluene, Ethylbenzenes and Xylenes (BTE&X) -- EPA Method <br /> 8020; <br /> • Organic Lead -- DHS Specified Method; and <br /> • EDB --DHS Specified Method. <br /> The findings from the laboratory testing are summarized in Table 2. <br /> Laboratory reports and chain of custody are attached. QAiQC procedures <br /> consisted of collecting a duplicate sample labeled MW-100 from well 1Vff-3, <br /> collecting a field blank, and including a travel blank. Analyses of the <br /> duplicate and sample blanks indicated all constituents analyzed for were <br /> below detection limits. At the laboratory, standard internal QA/QC <br /> procedures were followed. <br /> i Plotting and contouring ground water level contours (Figure 1) indicate a <br /> flow direction toward the southeast. Previously, 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 /> The laboratory findings generally indicate a decrease in concentration of <br /> petroleum and petroleum related compounds. The presence of organic lead <br /> was not detected in this quarter nor was it detected previously. EDB was <br /> analyzed for in the third quarter,but was not detected. <br />