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E iViRr"1,1111���jAL HEALTH en varos® <br /> ns :7` �T S-, ICE <br /> October 15, 1996 96 OCT } ? AM 4 1 . 4 5 <br /> Mr. R. Jeff Granberry <br /> Shell Oil Products Company <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - Third Quarter 1996 <br /> Shell Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> WIC #204-7884-0901 <br /> Dear Mr Granberry <br /> This Quarterly Monitoring Report describes the recently completed activities associated <br /> with ground water monitoring and sampling at the referenced site (Plates 1 and 2) This <br /> report was prepared to meet reporting requirements issued by the Regional Water Quality <br /> Control Board, Central Valley Region and San Joaquin County Public Health Services, <br /> Environmental Health Division <br />. Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the third quarter 1996 are summarized below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from Wells MW-lA through MW-3A on August 20, 1996 Samples were <br /> transported to Sequoia Analytical (Sequoia) of Redwood City, California for chemical <br /> analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a ground <br /> water elevation/benzene concentration map <br /> • A benzene concentration map was prepared and is presented on Plate 2 <br /> Annual Sampling <br /> Monitoring Wells MW-lA through MW-3A were sampled and analyzed for Total <br /> Purgeable Petroleum Hydrocarbons quantitated as gasoline (TPPH) according to EPA <br /> Method 8015 (Modified) and benzene, toluene, ethylbenzene, and xylenes (BTEX) and <br /> methyl-tertiary-butyl-ether (MTBE) according to EPA Method 8020 Well MW-1 A was <br /> also analyzed for MTBE according to EPA Method 8260 Additionally, a duplicate sample <br /> and an equipment blank were prepared and analyzed for quality control purposes <br /> Field monitoring data and chemical analytical data are summarized in Table 1 Blaine's <br /> Quarterly Ground Water Monitoring Report is presented in Appendix A <br /> Enviros, Inc 270 Perkins Street Sonoma Calrtornla Tel 707/935 4850 <br /> P 0 Pox 259 95476 0259 Fax 707/935 6649 <br />