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S E C O R <br /> Ms Victoria McCartney <br /> October 8, 2004 <br /> Page 2 <br /> • <br /> Number of Detections <br /> above the MDL of the 14 Minimum Maximum <br /> Constituents Total Samples Concentration in NgIL(Well ID) Concentration in NgIL(Well ID) <br /> TPHg 3 1,200(MW-7) 25,000(MW-15D) <br /> Benzene 3 7(MW-7) 1,100(MW-15) <br /> MtBE 3 0 5(MW-15) 2(MW-14&MW-17) <br /> Definitions <br /> MDL=Method detection limit <br /> NgIL=Micrograms per Liter <br /> If you have any questions or comments regarding these activities, please feel free to contact me at <br /> (916) 861-0400 extension 234 <br /> Sincerely, <br /> SECOR International incorporated <br /> David�M &.n <br /> Project Manager <br /> ATTACHMENTS <br /> Attachment A—September 13,2004, Groundwater Monitoring & Sampling Report by Gettler-Ryan <br /> Incorporated <br /> cc Robert J Cochran, Chevron Environmental Management Company, San Ramon, CA <br /> Jim Barton, Regional Water Quality Control Board, Rancho Cordova, CA <br /> Greyhound Lines, Dallas,TX <br /> I <br /> 11Chevron1905571Penodic Monitoring1200413Q2004 QMR 90557 doc SECOR International Incorporated <br />