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I <br /> To further define grounewater quality beneath the site,a second round of groundwater sampling <br /> was conducted on June 21, 1991 Nondetectable levels of petroleum constituents were recorded <br /> in monitoring wells MW1 and MW3 Monitoring well MW2 contained only detectable levels <br /> of TPHD, 68 µg11 No constituents were present above Maximum Contaminant Levels <br /> established by the State Department of Health Services <br /> A final round of sampling was completed on August 22, 1991 Only monitoring wells MW 1 <br /> and MW2 contained benzene above method detection limas, 0 41 and 0 63 µg/l, respectively <br /> No constituents were present above Maximum Contaminant Levels established by the State <br /> Department of Health Services A summary of the laboratory analyses is presented in Table 4 <br /> and laboratory reports with chain-of-custody documents are presented in Appendix IV <br /> Table 4 Chevron Stockton Laboratory Analysts of Groundwater-May, June,and August <br /> 1991 Results presented in µg/1 (ppb) <br /> DATE SAMPLE BENZENE TOLUENE ETHYL- XYLENES TPHG TPHD <br /> ID BENZENE (1) (2) <br /> _ 5!7191 MWl 085 is 10 29 41 ND <br /> MW2 077 ND ND 036 31 84 <br /> MW3 ND ND ND ND ND ND <br /> 6121191 MWi ND ND ND ND ND ND <br /> v MW2 ND ND ND ND ND 68 <br /> MW3 ND ND ND ND ND ID <br /> $122191 MWl 041 ND ND ND ND ND <br /> MW2 063 ND ND ND ND ND <br /> MW3 ND ND ND ND ND ND <br /> Detection Limits t 030 1 030 0-30__ 030 30 1 50 <br /> Notes <br /> STEX Analysis by EPA method 8015/8020 <br /> TPHG = Total Petroleum Hydmcarbons as Gasoline <br /> TPHD = Total Petroleum Hydrocarbons as Diesel <br /> (1) = Analysis by Modified EPA method 8015 <br /> (2) = Analysis by Modified EPA method 8015 <br /> ND = Compounds Not Detected above Method Detection Limits <br /> Cbwm U.S.A Ix 767 <br /> CSRM I 7 <br />