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S E C 0 R <br /> Mr. Jeffrey Wong <br /> October 22, 2004 <br /> Page 2 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 4 Concentration in pg1L(Well ID) Concentration in pg1L(Well ID) <br /> Total Samples <br /> TPHg 1 ND 83(MW-2) <br /> Benzene 0 ND ND <br /> MtBE 0 ND ND <br /> Definitions: . <br /> MDL=Method detection limit <br /> pg1L=Micrograms per liter <br /> ND =Non detect <br /> If you have any questions or concerns regarding these activities, please feel free to contact me at <br /> (916) 861-0400 extension 234. <br /> Sincerely, <br /> SECOR International Incorporated <br /> VavidM. Evans <br /> Project Manager <br /> ATTACHMENTS: <br /> Attachment A—Aug 12, 2004,Groundwater Monitoring &Sampling Report by Gettler-Ryan Incorporated <br /> cc: Robert J. Cochran, Chevron Environmental Management Company, San Ramon, CA <br /> Jim Barton, Regional Water Quality Control Board-Central Valley Region, Rancho Cordova, CA <br /> Steven Clair,Clair&Boss!, Stockton,CA <br /> Sherman Hinaman, Gridley,CA <br /> 1:IChevron1962581Periodi0 Monitoring120041302004 QMR 96258.doc SECOR International Incorporated <br />