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r <br /> Aa �1 <br /> 7 <br /> � a <br /> October 31, 1997 <br /> Mr. Alex Perez <br /> Shell Oil Products Company <br /> P O Box 8080 <br /> Martinez, California 94553 <br /> RE: Quarterly Monitoring Report - Third Quarter 1997 <br /> Shell Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> WIC #204-7525-0104 <br /> Dear Mr Perez <br /> This Quarterly Monitoring Report describes the recently completed activities <br /> associated with ground water monitoring and sampling at the referenced site <br /> (Plates 1 and 2) This report was prepared to meet quarterly reporting <br /> requirements issued by the Regional Water Quality Control Board, Central Valley <br /> Region and San Joaquin County Public Health Services (SJCPHS) <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the third quarter of 1997 are <br /> summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured <br /> ground water levels and collected samples from Wells MW-1 through <br /> MW-3 on August 22, 1997 During well gauging, Well VEW-2 was <br /> determined to be dry Samples were transported to Sequoia Analytical in <br /> Redwood City, California for chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and <br /> prepared a ground water contour/benzene concentration map (Plate 2) The <br /> ground water flow direction was to the east-southeast at an approximate <br /> hydraulic gradient of 0 001 <br /> • The ground water sample collected from Well MW-3 contained benzene and <br /> MTBE concentrations of 290 ppb and 87 ppb, respectively Petroleum <br /> hydrocarbons were not detected in ground water samples collected from <br /> Wells MW-1 and MW-2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through MW-3 were sampled and analyzed for Total <br /> Purgeable Petroleum Hydrocarbons quantitated as gasoline (TPPH) according to <br /> EPA Method 8015 (Modified), and benzene, toluene, ethylbenzene, and xylenes <br /> Enviros, Inc 270 Perkins Street Sonoma Callornia Tel 707/935 4850 <br /> P 0 Bax 259 95476 0259 Fax 7071935 6649 <br />