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i S E C 0 R <br /> Harlin Knoll <br /> April 30, 2004 <br /> Lj Page 2 <br /> Number of Detections <br /> above the MDL of the 10 Minimum Maximum <br /> Constituents Total Samples Concentration In7rg1L(Weil 1D) Concentration in pg/L(Well ID) <br /> TPHg 5 76(MW-1) 5,900(MW-2) <br /> iBenzene 2 28(MW-4D) 180(MW-2)` MtBE 3 4(MW-2) 15(MW-4D) <br /> TBA 0 ND ND <br /> Definitions: <br /> MDL=Method detection limit TPI-Ig=Total petroleum hydrocarbons as gasoline <br /> pgIL= Micrograms per liter MtBE=Methyl tertiary butyl ether <br /> h_ <br /> ND = Constituent reported 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 International Incorporated <br /> Bob W. Jackson Jr. <br /> Staff Geologist <br /> Attachments: <br /> Attachment 1 Groundwater Monitoring&Sampling Report by Gettler-Ryan, Incorporated, Dated February 23,2004 <br /> CC: Mr. Robert J.Cochran, Chevron Environmental Management Company, San Ramon,CA <br /> Mr.Jim Barton, Regional Water Quality Control Board, Rancho Cordova,CA <br /> Mr. Richard Berger, Berger&Company,Turlock, CA <br /> I:IChevron1932321Periodic Monitoring1200411Q2004 QMR 93232.doc SECOR International Incorporated <br />