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Chevron Products Company <br />Former Chevron Service Station 9` <br />2 <br />301 West Kettleman Lane, Lodi, California May 24, 2001 <br />445 feet based on depth to static water levels collected during site investigations (depth to <br />water approximately 55 feet below ground surface) and the boring log for the City of Lodi <br />well that indicates aquifer material (i.e., sand) to a depth of approximately 500 feet. A copy <br />of the boring log is attached. <br />Regarding your question on determining hydraulic conductivity, the actual saturated <br />thickness of the aquifer should be used to convert transmissivity to hydraulic conductivity, <br />not the saturated thickness of the aquifer to the depth of the extraction well. This was also <br />confirmed with Aqtesolv representatives. <br />If you have any questions or comments regarding this report, please feel free to call Mark A. <br />Trewartha at 503.691.2030 or Ronald D. Chinn at 650.691.0131, ext 36. <br />Sincerely, <br />SECOR International Incorporated <br />Az—mark A. Trewartha <br />Senior Hydrogeologist <br />Ronald D. Chinn, P.E. <br />Associate Engineer <br />u/ QgtOFESS/nNgl <br />C-1 <br />�P�D D. Cy Fyc� <br />O <br />W 41� No. C5886� Z rr" <br />n <br />Attachments: <br />Attachment A — City of Lodi Well No. 12 Well Log <br />cc: Harlin Knoll, San Joaquin County EHD, Stockton, CA <br />Bob Cochran, Chevron Products Company, San Ramon, CA <br />Ivern and Roger Baffoni, Lodi, CA <br />Frank Beeler, City of Lodi Water Department, Lodi, CA <br />Euclid Shopping Center, LLC, San Diego, CA <br />Norm Porges, Prime Shine Express Carwash, Modesto, CA <br />Jon Robbins, Chevron Legal, San Ramon, CA <br />C:\windows\TEMP\9577SAquifertestclarification.doc <br />'191 <br />