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1AW <br /> en viros® <br /> July 30, 1997 <br /> Mr. Alex Perez <br /> Shell Oil Products Company <br /> P Q Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - Second 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 second 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 MWA through <br /> MW-3 on June 10, 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 southeast at an approximate <br /> hydraulic gradient of 0 0005 <br /> • Ground water samples collected from Wells MW-1, MW-2, and MW-3 <br /> contained benzene concentrations of 0 62 ppb, 0 90 ppb, and 37 ppb, <br /> respectively Well MW-3 contained 49 ppb MTBE <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 /> (BTEX) and methyl-tertiary-butyl-ether (MTBE) according to EPA Method 8020 <br /> Enviros, Inc 270 Perkins Street Sonoma California Tel 707/935 4850 <br /> P 0 Box 259 95476 0259 Fax 707/935 6549 <br />