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8'ckgaound Wader 4u.1ay A—u yuc i Reaulto <br /> Do aao Avenue Stockton Ca tornia <br /> The analytical results are summarized in Table 1 The laboratory report and chain-of- <br /> custody form are also attached (the sewer discharge water results are presented in <br /> another report) Table 1 shows that background water quality is similar in the <br /> groundwater beneath the site and surface water from the shipping channel, possibly <br /> indicating a hydraulic connection The most significant difference was the presence of <br /> large numbers of E coli. in well MW-5 This may indicate a leaking sanitary sewer line <br /> nearby Although several drinking water parameters were exceeded by water samples <br /> from both locations, the E coli in MW-5 presents the most significant threat to potential <br /> beneficial uses of the site aquifer, at least as a potential drinking water source Drinking <br /> water standards are typically the most stringent measure of water quality <br /> The groundwater beneath the site appears to already have limited beneficial uses <br /> because of unacceptable water quality unrelated to dissolved petroleum hydrocarbons <br /> Therefore further remediation of dissolved petroleum hydrocarbons should not be <br /> necessary <br /> If you have any questions or comments please call us at (916) 782-2110 <br /> Sincerely <br /> AEGIS ENVIRONMENTAL_, INC <br /> C4c- cL '0 3500 <br /> Paul Graff - - <br /> Senior Geologist <br /> CA Registered Geologist #5600 ` OF <br /> C 1 �P <br /> PKGlsdh <br /> cc J Weber, C M Weber Enterprises, Inc <br /> E Thayer Central Valley Regional Water Quality Control Board <br /> M Meays San Joaquin County Environmental Health Department <br /> J Zolezzi, Neumiller and Beardslee <br /> Attachments <br /> i <br />