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MARLEY COOLING TOWER COMPANY <br /> STOCKTON, CALIFORNIA -FACILITY <br /> OFF—SITE RESIDENTIAL WELL SUMMARY <br /> The following chronology presents the off—site residential well <br /> activities conducted by consultants for the Marley Cooling Tower Company <br /> (MCTC) in Stockton, California: <br /> December 1984 An off—site sampling plan is prepared by Black & <br /> Veatch to identify operating potable water <br /> wells which may have been adversely affected by <br /> operations at the MCTC's wood treating facility <br /> in Stockton, California. <br /> February 1985 The well inventory task of the Off—site Sampl— <br /> ing Plan is implemented by Black & Veatch <br /> and Kleinfelder and Associates. Wells were <br /> identified from records held by local agencies, <br /> drillers, and well surveys within one mile <br /> dowgradient and one—half mile upgradient <br /> (groundwater flow) of the facility. Well <br /> locations, logs, and chemical analysis results <br /> were compiled and have been included in the <br /> Hydrogeologic Assessment Report submitted to <br /> the State of California Regional Water Quality <br /> Control Board, May 1987. <br /> April 1985 Black & Veatch and Canonie Engineers sample <br /> operable off—site wells in accordance with <br /> protocol stipulated in Off—site Sampling Plan. <br /> Samples obtained from five wells were submitted <br /> for analysis. <br /> May 19,95 Results from the off—site samples reveal <br /> concentrations of chromium, copper and arsenic <br /> below Drinking Water Standards and detection <br /> limits. Results are presented in Attachment 1. <br /> May 1987 A chromium concentration of 0.07 mg/l is <br /> detected in California Water Service Well 20-01 <br /> (CWS 20-01) during subsurface investigations <br /> conducted by Hargis and Associates. The well <br /> is located approximately one mile downgradient <br /> of the facility. <br /> 1 <br />