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i <br /> 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 MW1 and MW3 Monitoring well MW2 contained only detectable levels <br /> of TPHD, 68 jig/l. 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 MWl <br /> and MW2 contained benzene above method detection limits, 0 41 and 0 63 µg11, 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 1V <br /> Table 4 Chevron Stockton Laboratory Analysts of Groundwater-May,June, and August <br /> 1991. Results presented inµg11 (ppb) <br /> DATE SAMPLE BENZENE TOLUENE ETHYL- XYLENES TPHO TPHD <br /> ID BENZENE (1) (2) <br /> 5!7191 MWi 085 15 10 29 41 ND <br /> iMW2 077 ND ND 036 31 84 <br /> MW3 ND ND ND ND ND ND <br /> 6121/91 MW1 ND ND ND ND ND ND <br /> a MW2 ND ND ND Nil ND 68 <br /> MW3 ND ND ND ND ND ND <br /> 8/22/9t MWl 041 ND ND ND ND ND <br /> MW2 063 ND ND ND ND ND <br /> MW3 ND ND ND ND ND NT? <br /> Detection Linuts 1 030 1 030 1 030 030 30 SO <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 /> �- VW"M V:.1.i= W <br /> i <br />