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I <br /> Quarterly Groundwater Monitoring Report Exxon Station 7-3330 Page 2 <br />' <br /> by modified EPA Method 8015 and benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX) by EPA Method 8020 <br />' Analytic results for all sampling events, including this round of sampling, are presented in <br /> Table 2 The cham-of-custody form and laboratory reports with quality assurance/quality <br /> control documents are included as Appendices D and E <br />' COMMENTS <br /> The groundwater flow direction and gradient for the March sampling event was similiar to <br /> the events of January 21, 1992, December 26, 1991 and September 25, 1991 Samples <br />' collected from groundwater monitor well MW-3 had concentrations of TPH-g and BTEX <br /> below detection limits Monitor well MW-4 had levels of Benzene at 15 ppb MW-5 <br /> had levels of TPH-g at 5,700 parts per billion (ppb), and levels for BTEX were 1,200 <br />' ppb, 19 ppb, 500 ppb and 780 ppb, respectively MW-6 had levels of Benzene at 10 <br /> ppb <br /> We have included copies of this report for you to forward to the appropnate regulatory <br />' agencies and representatives <br /> Mr Mike Infurna, R E H S <br /> Public Health Service/Environmental Health Division <br /> San Joaquin County <br /> P O Box 2009 <br />' Stockton, CA 95201 <br /> Ms Beth Thayer <br /> Central Valley Region <br /> California RWQCB <br /> 3443 Routier Road <br /> Sacramento, CA 95201 <br />' Artesian is pleased to provide environmental consulting services to Exxon Company, <br /> U S A Please call us at (415) 381-6456 if you have any questions <br />' Sincerely, <br /> Artesian Environmental Consultants <br /> 1 <br />' atthew I-1 Walraven <br /> Project Geologist REo oCO <br /> A l q0 eO <br /> � N � <br /> aes A Jacob , R G i# 11N 0 4815 <br /> Principal Geologist <br /> s� <br /> �P <br /> R <br /> TF OF CA0 0 <br />'I <br />