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4.0 CONCLUSIONS 3: The groundwater samples collected from monitoring well MW-1 contained 17 parts per billion (ppb) methyl-tertiary-butyl ether (MTBE). The groundwater samples collected froth' monitoring well MW-2 contained 5,700 ppb TPH-G, 340 ppb benzene, 66 ppb toluene, 260 ppb ethyl benzene, 220 ppb total xylenes, 6,000 ppb MTBE, 23 ppb tert-amyl- methyl-ether (TAME), and 710 ppb TBA. Groundwater samples collected from monitoring well MW-4 contained 630 ppb TPH-G, 84 ppb benzene, 32 ppb ethyl benzene, 510 ppb MTBE, .arid 19 ppb TAME. Groundwater samples collected from monitoring well MW-5 contained 17 ppb MTBE a n d 6.1 ppb TBA. Groundwater samples collected from monitoring well MW-6 contained 0.77 ppb MTBE. No other hydrocarbons were detected above laboratory reporting limits in any of the groundwater samples collected. There appears to be a decreasing trend in hydrocarbon and oxygenate concentrations detected in the groundwater samples collected from monitoring wells MW-1 and MW-5. ,There appears to be an increasing trend in TPH-G and MTBE concentrations in MW-2. Concentrations of all i compounds detected in groundwater ' samples collected from all other monitoring wells are consistent with previous results. All the compounds in monitoring well MW-3 were below laboratory detection limits. The only compound detected in monitoring wells , MW-1 and MW-6 was MTBE. i 5.0 RECOMMENDATIONS j ASE recommends the subject site remain on a quarterly sampling schedule. The next scheduled sampling is scheduled for May 2002. ASE has also submitted a corrective action plan (CAP) for the site dated January 16, 2002. ASE will prepare a remedial action plan for the site once the cap i s approved by the regulatory agencies. i :I x .;i i. ?3 Singh's Unical Service Station Quarterly Report - February 2002 Sampling -3- 1 11