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1 <br /> Fourth � ��� <br /> Quarter 1992 Monitoring Report <br /> Coca-Cola Enterpnses- West <br /> February 10, 1993 <br /> Page 3 <br /> ' No evidence of measurable floating product or hydrocarbon vapor was noted in the water <br /> samples At least three well volumes were removed from each well and the wells were allowed <br /> ' to recover Samples were then collected from each well using disposable bailers Purge water <br /> was contained in 55 gallon DOT approved drums and stored on-site Upon completion of <br /> monitoring, all groundwater well caps were replaced with locking, water-tight well caps <br /> ' The groundwater samples collected from each well were submitted with Chain of Custody <br /> Record to RESNA Analytical Laboratories, a State Certified laboratory Samples were analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHG), total petroleum hydrocarbons as diesel <br /> (TPHD), and benzene, toluene, ethylbenzene, and total xylenes (BTEX) utilizing EPA methods <br /> 50301801518020 <br /> Groundwater well purge and sample logs are provided in Appendix A <br /> ' RESULTS OF LABORATORY ANALYSES <br /> IP Water samples collected from wells MW-1, MW-2, and MW-6 were analyzed for TPHG, <br /> TPHD, and BTEX using modified EPA methods 5030/8015/8020 These results and cumulative <br /> results of laboratory analyses are summarized in Table 1 The Chain of Custody Record and <br /> laboratory analytical reports are included in Appendix B. <br /> Results of this quarter's laboratory analyses of water samples from wells MWA, MW-2, and <br /> ' MW-6 indicate the following <br /> ' • Concentrations of benzene, toluene, and total xylenes detected in well MW-1 remained <br /> essentially unchanged since the last monitoring episode The benzene concentration of <br /> 36 parts per billion (ppb) exceeded the State of California Department of Health Services <br /> ' Maximum Contaminant Level (MCL) for drinking water of 1 0 ppb The toluene <br /> concentration of 0 6 ppb was within the State Action Limit of 100 ppb and the xylene <br /> concentration of 1 9 ppb is within the MCL of 1,750 ppb Ethylbenzene remained <br /> ' nondetectable <br /> • In well MW-1, concentrations of TPHG increased from 160 ppb to 290 ppb since the <br /> ' previous monitoring episode in November 1991 but are still in the same order of <br /> magnitude <br /> • Concentrations of TPHG and BTEX remained nondetectable in well MW-2 while the <br /> concentration of TPHD decreased from 85 ppb to nondetectable (C 50 ppb) <br /> ' 4QMR1992 FML <br />