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S EEC0R <br /> Harlin Knoll <br /> April 30, 2004 <br /> Page 2 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 4 Concentration in pglL(Well ID) Concentration In pg1L(Well ID) <br /> Total Samples <br /> TPHd 1 ND 2,900(MW-4) <br /> TPHg 2 53(MW-3) 16,000(MW-4) <br /> Benzene 0 ND ND <br /> MtBE 2 57(MW-4) 1,000(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 reported below the laboratory reporting limits MtBE=Methyl tertiary butyl ether <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 /> SECOR International Incorporated <br /> ob W Jackson Jr <br /> Staff Geologist <br /> Attachments <br /> x <br /> i <br /> Attachment 1 Groundwater Monitoring&Sampling Report by Gettler-Ryan, Dated February 24,2004 <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 Joe Neely, Cambria, Sonoma, CA <br /> 1 1Chevron1982641Penodic Monitoring1200411Q2004 QMR 98264 doc SECOR International Incorporated <br /> 6 <br />