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R.1 Interim Remediation Plan and Second Quarter 2001 Groundwater Monitoring Report Moore Petroleum Bulk Plant,549E F Street,Banta,California Page 8 The laboratory analytical reports and chain-of-custody forms are included in Appendix D. Analytical :results are summarized in Table 5. All purged and recovered liquids are stored temporarily on site in Department of Transportation- approved, 55-gallon drums pending removal from the site by a licensed hauler to an appropriate disposal facility. CONCLUSIONS AND RECOMMENDATIONS Conclusions 1 Groundwater analytical results indicate shallow groundwater beneath the site has been impacted by petroleum hydrocarbons. MW-2, MW-5, and the Rhodes domestic well were non-detect for all analyzed constituents. Results for wells with detectable concentrations are as follows: • MW-1: TPHd was non-detect this quarter. MTBE decreased this quarter while TBA and motor oil was detected. • MW-3: TPHd decreased to below detection limits while motor oil was detected this quarter. All other analyzed constituents were non-detect. • MW-4A: All analyzed constituents were below, detection limits except-for MTBE, which decreased this quarter. MW-7: All constituents above detection limits last quarter have decreased this quarter except total xylenes. MW-8: All constituents above detection limits last quarter have decreased this quarter with the exception of MTBE, which increased slightly. Motor oil was detected for the first time this quarter. • MW-9: All constituents above detection limits last quarter have increased this quarter. Motor oil was detected for the first time this quarter. • MW-10: TPHg and TPHd increased this quarter. BTEX except xylenes decreased and MTBE decreased to below detection limits this quarter. • MW-11: TPH motor oil was the only detected constituent and decreased this quarter. • MW-12: TPH motor oil and MTBE were the only detected constituents, and decreased this quarter. 1