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' Quarterly Groundwater Monitoring Report Enzon Station 7-3330 Page 2 <br /> the January sampling events Groundwater-elevation data are presented in Table I The <br /> 1 estimated groundwater flow direction at the site in December and in January was toward <br /> the northeast. <br />' ANALYTICAL RESULTS <br /> Groundwater samples from monitor wells MW-3 through MW-6 from the December 26, <br />' 1991 event and groundwater samples from monitor well MW-5 from the January 21, <br /> 1992 event were analyzed for total petroleum hydrocarbons as gasolene CMH-g) by <br /> 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 chain-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 December sampling event was <br /> sinuhar to the last sampling event of September 25, 1991 Samples collected from <br /> groundwater monitor wells MW-3, MW-4 and MW-6 had concentrations of TPH-g and <br /> BTEX below detection limits (non-detect, ND) For the December sampling event, <br /> monitor well MW-5 had levels of TPH-g at 5,600 parts per billion (ppb), and levels for <br />' BTEX were 1,000 ppb, 7 6 ppb, 210 ppb and 1,000 ppb, respectively For the January <br /> sampling event, monitor well MW-5 was resampled and had levels of TPH-g at 4,800 <br /> ppb, and levels for BTEX were 1,000 ppb, ND, 320 ppb and 83 ppb, respectively <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 Routeer Road <br />' Sacramento, CA 95201 <br /> 100 Shoreline Hwy, Suite 295 B • Mill Valley, CA 94941 • (415) 381-6456 FAX (415) 389-0423 <br /> I <br /> 1 <br />