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i <br /> To further define groundwater 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 MWI and MW3 Monitoring well MW2 contained only detectable levels <br /> of TPHD, 68 gg/i 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 MWI <br /> and MW2 contained benzene above method detection limits, 0 41 and 0 63 pg/l, respectively <br /> No constituents were present above Maximum Zontaminant Levels established by the State <br /> Department of Hey lth 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 1V <br /> Table 4 Chevron Stockton Laboratory Analysis of Groundwater-May,June, and August <br /> 1991 Results presented in jtg11 (ppb) <br /> DATE SAMPLE BENZENE TOLUENE ETHYL- XYLENES TPHD TPHD <br /> ID BENZENE (1) (2) <br /> 517191 MWI 085 is 1 4 29 41 ND <br /> MW2 077 ND ND 0 36 31 84 <br /> MW3 ND ND ND ND ND ND <br /> 6121191 MWI ND ND ND ND ND ND <br /> MW2 ND ND ND ND ND 68 <br /> MW3 ND ND ND ND ND ND <br /> 8122191 MWI 041 ND ND ND ND ND <br /> MW2 063 ND ND ND ND ND <br /> MW3 ND ND ND ND ND ND <br /> Detect.on Limits 030 030 030 030 30 50 <br /> Notes <br /> BTEX Analysis by EPA method 8015/8020 <br /> TPHG = Total Petroleum Hydrocarbons 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 /> Cwr�US+ Im 367 , <br /> CSRVNI <br />