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' Quarterly Groundwater Monitoring Report Exxon Station 7-3330 2 <br /> Method 8020 The analytic results for all sampling events, including this round of <br />' sampling, are summarized in Table 2 The chain-of-custody form and laboratory ieports <br /> with quality assurance/quality control documents are included in Appendix C <br /> tCOMMENTS <br /> The groundwater flow direction and gradient for the June sampling event was similiar to <br /> the last sampling event of March, 1992 Samples collected from groundwater monitor <br /> wells MW-3, MW-4, and MW-6 did not contain concentrations of TPH-g and BTEX <br /> above measured detection limits (MDL) MW-5 had concentrations of 1,700 ppb for <br /> TPH-g and 190 ppb for benzene, 0 9 ppb for toluene, 14 ppb for ethylbenzene and ND <br /> for total xylenes <br /> Monitor well MW-4 did not contain detectable levels of benzene in June, 1992 as <br /> compared with levels of benzene at 15 parts per billion (ppb) MW-5 had significantly <br /> lower levels of TPH-g and BTEX in June, 1992 as compared with March, 1992, most <br />' likely related to the completion of the soil remediation project in June, 1992 MW-5 <br /> TPH-g levels were 5,700 ppb for the March, 1992 sampling event and 1,700 ppb for the <br /> June, 1992 sampling event Similiar decreases were noted in the BTEX values for MW-5 <br />' DISTRIBUTION <br /> We have included copies of this report for you to forward to the appropriate 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 /> t <br /> ' 3175 Kerner Boulevard,Suite E • San Rafael,CA 94901 • (415)257-4801 • FAX (415)257-4805 <br />