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TREADWELL & ROLLO, INC. <br /> Consulting Engineers and Scientists <br /> 353 Sacramento Street, Suite 800 <br /> San Francisco, California 94111 <br /> (415) 955-9040 <br /> 5 November 1991 <br /> Project 1107A2 <br /> Confidential <br /> Attorney Work Product <br /> Attorney-Client Communication <br /> Dinah Szander <br /> Assistant General Counsel RECEIVED� I,V/� <br /> McKesson Corporation <br /> Law Department JAN 13 1992 <br /> One Post Street, 34th Floor <br /> San Francisco, California 94104-529(FNVI RON MENTAL HEALTH <br /> R-RMIT/SERVICKS <br /> Subject: Groundwater Conditions <br /> Industrial Park Drive/Bessemer Avenue <br /> Manteca, California <br /> Dear Ms. Szander: <br /> The enclosed report summarizes the results of our evaluation of groundwater conditions <br /> at the subject site. <br /> The report reflects our findings that low levels of petroleum hydrocarbons as diesel fuel <br /> were detected in the site's two upgradient wells in the initial round of sampling <br /> conducted in late August of this year, and similar levels were detected in one upgradient <br /> well in the confirmation sampling conducted in September. We believe that these <br /> impacts are from an off site source. <br /> Please call if you have any questions or require any further information. <br /> Sincerely yours, <br /> TREADWELL & ROLLO, INC. <br /> James Ordons, C.E.G. Christopfi k. Jenning , P <br /> Project Geologist Senior Engineer <br /> enclosures <br /> CRJ:gej <br />