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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 /> Groundwater Sampling and Anal sis
<br /> On May 29, 1997, Apex personnel collected groundwater samples from monitoring wells MW-6
<br /> through MW-9, from the station's domestic well (DM-1), and the domestic well located at the
<br /> trailer park south of the subject site(DM-2) On June 14, 1997, Apex personnel collected
<br /> groundwater samples from monitoring wells 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, TPH, 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, TPH, 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 analysts identified 1,2 DCE above the California Department of Health
<br /> Services, Drinking Water Standard Maximum Contaminant Level (MCL) of 0 5 ppb in MW-1
<br /> through MW-4, however, these levels are below the U S Environmental Protection Agencyos
<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
<br /> levels of TPH as gasoline (less than 63 ppb), xylenes (less than 3 5 ppb), and MTBE (less than 11
<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 /> AAIQMR0797 WPD
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