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S ECOR <br /> Ms. Victoria McCartney <br /> July 25, 2005 <br /> Page 2 <br /> Hydrocarbons concentrations have decreased with time in MW-4 (MtBE), MW-5S (MtBE and TAME), <br /> and MW-6S (TAME). <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 10 Concentration in pg/L(Well ID) Concentration in pgIL(Well ID) <br /> Total Samples <br /> TPHg 0 ND ND <br /> Benzene 0 NO ND <br /> MtBE 2 520(MW-8) 1,200(MW-6S) <br /> Definitions: <br /> MDL=Method detection limit <br /> pgIL=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 241. <br /> Sincerely, <br /> SECOR International Incorporated <br /> Brian Carey <br /> Project Manager <br /> ENCLOSURES: <br /> Attachment 1 —June 16, 2005 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 /> 1AChevron1914521Periodic Mon itori ng1200512Q2005 QMR 91452.doc SECOR International Incorporated <br />