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I�. <br /> Chevron <br /> tz <br /> Chevron U.S.A. Inc. <br /> 21111 Camino Ramon,San Ramon,Uifamn•Phnne 1415i B42 9500 <br /> :.- t' hd Address P0.Be.U 1,Si,fiamon,CA q-1�92 ial I <br /> Marketing Npartm fit <br /> May 9, 1991 <br /> Mr. Steve Schneider <br /> San Joaquin County Environmental ilealth <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> r. <br /> Re: Chevron S.S. #9-6171 <br /> 6633 Pacific Avenue,Stockton,CA <br /> MAY <br /> Dear Mc Schneider: ENVIRONN` NTAf.. HEALTH <br /> i'FRhrI1T;5CR4'1Cf_S <br /> Enclosed is a report dated April I, 1991 which describes groundwater monitoring by Chevron's <br /> consultant, Sierra Environmental (SE), on March 14, 1991 at the site referenced above. <br /> Groundwater gradient direction and levels of petroleum hydrocarbons were consistent with <br /> previous observations. No gasoline or BTEX constituents were detected in any of the samples. <br /> Groundwater samples were split with Kennedy-Jenks-Chilton (KJC), a consulting firm <br /> investigating groundwater contamination from two nearby dry cleaners, 'rhe samples were <br /> analyzed for volatile organics by EPA method 8240. The results are tabulated below. <br /> Well# I 2 dichlorcethane trichloroethene tetrachlorocthene chloroform <br /> MW-2 <0.5 ppb 0.8 ppb 42 ppb <0.5 ppb <br /> MW-3 <0.5 0.5 <0.5 <0.5 <br /> MW-4 <0.5 13 850 <0.5 <br /> MW-5 26 2.2 9.2 1.4 <br /> Chevron will again monitor the site in June 1991. <br /> If you have any questions or comments,please contact me at(415)842-8658. <br /> Sincerely, <br /> Clint B. Rogers <br /> Environmental Engineer <br /> Enclosure <br /> cc: Jim Maughan,Central Valley RWQCB,Sacramento,CA <br /> Wilbur Smith I1,Sims-Grupe Mgml.,374 Lincoln Center,Stockton,CA 95207 <br /> Sharon I-lalper,Sierra Environmental,Martinez,CA(w/o enclosure) <br /> 1 <br />