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S LLQ C ® R <br /> Harlin Knoll <br /> October 27, 2003 <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 pglL(Well ID) <br /> Total Samples <br /> TPHd 3 80(MW-3) 540(MW 5) <br /> TPHg 4 99(MW-5) 290(MW-7) <br /> Benzene 4 1 (MW-5) 38(MW-4) <br /> MtBE 5 4(MW-1) 160(MW-3) <br /> Definitions <br /> MDL=Method detection limit TPHg=Total petroleum hydrocarbons as gasoline <br /> pg/L=Micrograms per liter TPHd=Total petroleum hydrocarbons as diesel <br /> ND =Constituent detected below the laboratory reporting limits MtBE=Methyl tertiary butyl ether <br /> I <br /> i <br /> Should you have any questions or concerns regarding these activities, please feel free to contact me <br /> at(916)861-0400, extension 283 <br /> Sincerely, <br /> SECORWinternationI Incorporated <br /> B W <br /> Staff Geologist <br /> Attachments <br /> Attachment 1 Groundwater Monitoring & Sampling Report by Gettler-Ryan, Dated September 4, <br /> 2003 <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 /> Ms Kathryn Pudenz, San Francisco, CA <br /> Mr Robert Kitay,Aquascience, Danville,CA <br /> 1 1Chevron1986321Penodic Monitonng1200313Q2003 GMR 98632 Rev A doc SECOR International Incorporated <br />