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Second Quarter 1997 Groundwater Monitoring Report <br /> Moore Petroleum, 14800 W.Frontage Rd.,Manteca,CA <br /> September 11, 1997 <br /> Page 3 <br /> t <br /> i <br /> Groundwater Sarril)1inix and Analysis <br /> i <br /> On May 29, 1997, Apex personnel collected groundwater samples from monitoring wells MW-6 <br /> ' is well M-1 and the domestic well located at the <br /> -9 from the station's domestic through MW (D }, <br /> trailer park south of the subject site (DM-2). On June 14, 1997, Apex personnel collected <br /> groundwater samples from monitoring weUs MW-1 through MW-5. All samples were submitted, ` <br /> under chain-of-custody, to Sparger Technology, Inc. in Sacramento, California, a state-certified <br /> analytical laboratory_ All samples were collected according to the Apex SOP included in Appendix <br /> A Groundwater samples collected from MW-1 through MW-4 were analyzed for total petroleum <br /> hydrocarbons (TPH), as gasoline; benzene, toluene, ethylbenzene and total xylenes (BTEX� by <br /> EPA Method 802018015; TPI, as diesel, by EPA Method 8015 Modified; methyl-tert-butyl-ether <br /> (MTBE) by EPA Method 8020; and 1,2 Dichloroethane (DCE) by EPA Method 601. The <br /> groundwater sample collected from MW-5 was analyzed for TPH, as gasoline; BTEX by EPA <br /> Method 802018015;MTBE by EPA Method 8020; and 1,2 DCE by EPA Method 601. <br /> Groundwater samples collected from monitoring wells MW-6 through MW-9 were analyzed for <br /> TPH, as gasoline; BTEX by EPA Method 8020/8015; and MTBE by EPA Method 8020. <br /> Groundwater samples collected from the domestic wells (DM-1 and DM-2) were analyzed for <br /> TPH, as gasoline;BTEX by EPA Method 8020/8015;MTBE by EPA Method 8020; TPI as <br /> diesel, by EPA Method 8015 Modified; and 1,2 DCE by EPA Method 601. <br /> The result of this sampling event is summarized in Table 2. The most recent laboratory analytical <br /> reports and chain-of-custody forms are included in Appendix B. <br /> RECOMMENDATIONS <br /> The analytical results of the groundwater samples collected on June 14, 1997 from MW-1 through <br /> MW-5 indicate that levels of TPH as gasoline;BTEX; TPH, as diesel;MTBE are below detection <br /> limits (BDLs). Laboratory analysis identified 1,2 DCE above the California Department of Healthi. <br /> Services, Drinking Water Standard Maximum Contaminant Level (MCL) of 0.5 ppb in MW-I <br /> through MW-4; however, these Ievels are below the U.S. Environmental Protection Agency0s <br /> MCL of 5 ppb (1,2 DCE was not identified above the laboratory detection limit in MW 5). <br /> With the exception of low concentrations of TPH, as gasoline(less than 60 ppb), xylenes (less than <br /> 2.8 ppb), and MTBE (less than 44 ppb), analytical results of the groundwater samples collected on <br /> May 29, 1997 from MW-6 through MW-9 indicate that previous contaminant levels are BDLs. <br /> Laboratory analysis of the groundwater samples collected from DM-1 and DM-2 identified low S <br /> levels of TPH as gasoline(less than 63 ppb), xylenes(less than 3.5 ppb), and MTBE (less than I I <br /> ppb). in addition, 1,2 DCE above the California Department of Health Services, Drinking Water <br /> Standard MCL of 0.5 ppb was identified in DM-2 (2.2 ppb); however, this level is below the U.S. ' <br /> Environmental Protection Agency's MCL of 5 ppb (1,2 DCE was not identified above the <br /> laboratory detection limit in DM-1). <br /> A:1QMR4797.WPD <br />