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S ECOR <br /> Ms. Victoria McCartney <br /> January 30, 2006 <br /> _ Page 2 <br /> Number of Detections <br /> above the MDL of the 10 Minimum Maximum <br /> Constituents Total Samples Concentration in NgIL(Well ID) Concentration in pglL(Well ID) <br /> 7PHg 0 ND ND <br /> Benzene 0 ND ND <br /> MtBE 1 ND 9(MW-8) <br /> Definitions: <br /> MDL=Method detection limit <br /> pglL=Micrograms per liter <br /> ND =Non detect <br /> MtBE has not been detected above laboratory reporting limits in MW-4 and MW-5S for five <br /> consecutive quarters (4'h quarter 2004 through 4'h quarter 2005). In addition, MtBE concentrations in <br /> batch extraction wells MW-6S and MW-8S remain below the California Department of Health <br /> Services Primary Maximum Contamination Level of 13 ug/L. <br /> If you have any questions or concerns regarding these activities, please feel free to contact me at <br /> (916)861-0400 extension 241. <br /> Sincerely, <br /> SECOR International Incorporated <br /> Brian Carey, P.G. <br /> Project Manager <br /> ENCLOSURES: <br /> Attachment 1 —January 5, 2006 Groundwater Monitoring & Sampling Report by Gettler-Ryan <br /> Incorporated <br /> cc: Darin Rouse, Chevron Environmental Management Company, San Ramon, CA <br /> Jim Barton, Regional Water Quality Control Board, Rancho Cordova, CA , <br /> Matt Mechado, City of Ripon, Ripon, CA <br /> 1:1Chevron1914521Periodic Mon itoring1200514Q2005 QMR 91452.doc SECOR International Incorporated <br /> 1 <br />