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i 7 <br /> S E C 0 R <br /> Ms. Victoria McCartney <br /> October 27, 2005 <br /> Page 2 <br /> A summary of total petroleum hydrocarbons as gasoline (TPHg), diesel (TPHd), and motor <br /> oil (TPHmo), benzene, and methyl tertiary butyl ether (MtBE) laboratory analytical data are <br /> listed below. <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 41 Concentration in Erg1L(Well ID) Concentration in pg/L(Well ID) <br /> Total Samples <br /> TPHg 3 <50 6,000(MW-15D) <br /> TPHd 11 59(MW-8) 2,900(MW-15) <br /> TPHmo 11 45(MW-8) 1,300(MW-15) <br /> Benzene 3 <0.5 600(MW-15) <br /> MtBE 4 <0.5 4(MW-14) <br /> EXPLANATION: <br /> ,ug/L=Micrograms per Liter <br /> MDL=Method Detection Limit <br /> If you have any questions or comments regarding these activities, please feel free to <br /> • contact me at (559) 271-2650 extension 241. <br /> Sincerely, <br /> SECOR International Incorporated <br /> Stephen Richard <br /> Project Scienti <br /> ENCLOSURES: <br /> Attachment A--October 7, 2005, Groundwater Monitoring & Sampling Report by <br /> Gettier-Ryan Incorporated <br /> cc: Darin Rouse, Chevron Environmental Management Company, San Ramon, CA <br /> Jim Barton, Regional Water Quality Control Board, Rancho Cordova, CA <br /> Greyhound Lines, Dallas, TX <br /> N:IChevronl90557IPeriodicMonitoring1200513Q2005 QMR 90557 <br />