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S E C 0 R <br /> Harlin Knoll <br /> July 29, 2003 <br /> . Page 2 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 4 Concentration In pg/L(Well ID) Concentration in pg/L(Well ID) <br /> Total Samples <br /> TPHd 2 57(MW 3) 4,200(MW-4) <br /> TPHg 2 74(MW-3) 11,000(MW-4) <br /> Benzene 0 ND ND <br /> MtBE 3 3(MW-2) 1,100(MW-3) <br /> Definitions <br /> MDL=Method detection limit TPHg=Total petroleum hydrocarbons as gasoline <br /> pg/L=Micrograms per liter TPI-Id=Total petroleum hydrocarbons as diesel <br /> ND =Constituent detected below the laboratory reporting limits <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 Inter atlonal Incorporated <br /> Bob W Jackson Jr <br /> Staff Geologist <br /> Attachments <br /> Attachment 1 Groundwater Monitoring &Sampling Report by Gettler-Ryan, Dated June 2, 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 Joe Neely,Cambria, Sonoma, CA <br /> r� <br /> 11Chevron1982641Penodic Monitoring1200312C2003 CMR 98264 Rev A doc SECOR International Incorporated <br />