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Ms Mary Meays Page 2 <br /> - October 14, 1991 <br /> cleaned and decontaminated with an Alconox@ solution followed by a de- <br /> ionized water rinse Water from decontamination procedures was retained <br /> in 55-gallon drums and stored on site Latex type gloves were worn while <br /> handling sampling equipment and sample bottles Bailer cord was replaced <br /> before sampling at each well location <br /> Laboratogy Analyses <br /> Water samples collected at the site were sent to Sequoia Analytical, Inc , <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 (TPH-G) -- EPA <br /> Method 8015-M, <br /> • Total Petroleum Hydrocarbons as Diesel (TPH-D) (Former Tank <br /> Site #2 Only) -- EPA Method 8015-M, and <br /> • Benzene, Toluene, Ethylbenzenes and Xylenes (BTEX) -- EPA <br /> Method 8020 <br /> Per your letter dated July 27, 1992 to Mr Nohni, we are no longer required to <br /> analyze for total lead, organic lead, or ethylenedibromide <br /> The findings from the laboratory testing are summarized in Tables 2 and 3 <br /> Laboratory reports and chain of custody are attached QA/QC procedures <br /> consisted of including a travel blank and a field blank Analyses of the travel <br /> blank and field blank indicated that all constituents analyzed for were below <br /> detection limits At the laboratory, standard internal QA/QC procedures were <br /> followed <br /> Fin in <br /> The following is a discussion of the findings for Former Tank Sites #1 and #2 <br /> Former Tank Site #1 <br /> Plotting and contouring ground water level contours (Figure 2) indicate a <br /> trough centered at MW-5 and oriented towards the southeast This result is <br /> consistent with that obtained during the previous recent quarters of <br /> monitoring During initial monitoring activities, groundwater flow <br /> directions were oriented towards the southwest As previously discussed, the <br /> variability in flow direction is probably due to the influence of tidally induced <br /> water level changes in the adjacent Stockton deep water channel Tidal data <br /> for the Stockton area is provided in Table 4 <br /> • <br />