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S E C 0 R <br /> Harlin Knoll <br /> January 29, 2004 <br /> • Page 2 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 8 Concentration In pg[L(Well ID) Concentration in pg1L(Well ID) <br /> Total Samples <br /> TPHd 2 58(MW-2) 160(MW-7) <br /> TPHg 3 71 (MW-3) 390(MW-7) <br /> Benzene 3 1 (MW 3) 19(MW-7) <br /> ti <br /> MtBE 5 5(MW-1 &MW-6A) 110(MW-3) <br /> Definitions <br /> MDL=Method detection limit TPHg =Total petroleum hydrocarbons as gasoline <br /> pg1L= Micrograms per liter TPHd =Total petroleum hydrocarbons as diesel <br /> ND =Constituent reported below the laboratory reporting limits MtBE =Methyl tertiary butyl ether <br /> s� <br /> Should you have any questions or concerns regarding these activities, please feel free to contact me s 4 <br /> at (916) 861-0400, extension 283 <br /> Sincerely, <br /> SECOR International Incorporated <br /> t° <br /> S y <br /> Bob W Jackson, Jr <br /> Staff Geologist <br /> Attachments 5� <br /> Attachment 1 Groundwater Monitoring&Sampling Report by Gettler-Ryan, Dated December 3, 2003 <br /> IV2A <br /> cc Mr Robert J Cochran,Chevron Environmental Management Company, San Ramon,CA { <br /> Mr Jim Barton, Regional Water Quality Control Board, Sacramento,CA <br /> Mr Rudy Sanchez,Tracy Express Wash & Lube,Tracy, CA <br /> Ms Stella Rickman,Tracy, CA ' <br /> x> <br /> Ms Kathryn Pudenz, San Francisco, CA <br /> Mr Robert Kitay,Aquascience, Danville, CA ;y s <br /> i <br /> 1Chevron1986321Periodic Monitoring120031402003 QMR 98632 doc SECOR Intemational Incorporated <br />