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S ECOR <br /> Ms.Victoria McCartney <br /> October 24, 2005 <br /> Page 2 <br /> Humber of Detections Minimum Maximum <br /> Constituents aboYe the MDL of the 10 Concentration in pglL(Well ID) Concentration in lag/L(Well ID) <br /> Total Samples <br /> TPHg 0 ND ND <br /> Benzene 0 ND ND <br /> MtBE 2 3(MW-6s) 6(MW-8) <br /> Definitions: <br /> MDL=Method detection limit <br /> pgIL=Micrograms per liter <br /> ND =Non detect <br /> MtBE has not been detected above laboratory reporting limits in MW-4 and MW-5S for four <br /> consecutive quarters (4th quarter 2004 through 4th quarter 2005). In addition, MtBE concentrations in <br /> batch extraction wells MW-6S and MW-8S are below the California Department of Health Services <br /> Primary Maximum Contamination Level of 13 ug/L. Based on this data, SECOR has suspended"the <br /> weeklydbatch extraction, pending San Joaquin County Environmental Health Department approval. <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 —October 7, 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 /> I:IChevron1914521Periodic Mon itoring1200513Q2005 QMR 91452.doc SECOR International Incorporated <br /> E <br />