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s <br /> October 24, 1997 <br /> Alex Perez <br /> Shell Oil Products Companv <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Domestic Well Sampling - 2452 Country Club Blvd. <br /> Shell Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> WIC 204-7524-3505 <br /> Dear Mr Perez <br /> This letter documents the results of ground water sampling activities performed on behalf <br /> of Shell Oil Products Company (Shell) at 2452 Country Club Boulevard, Stockton, <br /> California (Plate 1) A domestic water well exists on this property which is located in the <br /> vicinity of the above referenced Shell Service Station Collection of ground water samples <br /> from domestic wells in the vicinity of the Shell Service Station was requested by San <br /> Joaquin County Public Health Services (SJCPHS) to determine if nearby domestic wells <br /> have been impacted by petroleum hydrocarbons <br /> Procedures <br /> Ground water samples were collected from the well on September 5, 1997 Ground water <br /> sampling was performed by Blaine Tech Services (Blaine) of San Jose, California <br /> The sample was collected from an above-ground sampling port located in the pump <br /> discharge line immediately downstream from the pump The pump was turned on and <br /> allowed to cycle three times(approximately 5 minutes) at which time the sample was <br /> collected A gauging port is present on this well, but was inaccessible for collection of <br /> water level data or ground water samples during this sampling event <br /> The water sample was collected in an appropriate container, and transferred to Sequoia <br /> Analytical of Redwood City, California, a state-certified laboratory, for analysis The <br /> ground water sample was analyzed for Total Purgeable Petroleum Hydrocarbons as <br /> gasoline according to EPA Method 8015 (modified), benzene, toluene, ethylbenzene, <br /> xylenes (BTEX), and methyl-tertiary-butyl ether (MTBE) according to EPA Method 8020, <br /> and oxygenate compounds including methanol, ethanol, tertiary butanol, di-isopropyl <br /> ether, ethyl tertiary butyl ether, and tertiary amyl methyl ether Analysis for methanol was <br /> performed by EPA Method 8015 (modified) and the other oxygenates were analyzed by <br /> EPA Method 8260 <br /> Cnvlroa, Inc 270 Perkins Street Sonoma Caritorrna Tel 707/938 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6649 <br />