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BE KLEINFELDER 3 SUMMARY AND RECOMMENDATIONS Groundwater monitoring has been conducted at this facility since 1987 to evaluate groundwater quality A summary of the current site conditions and a recommendation for subsequent work are as follows • During this event, the average depth to groundwater among the wells was 45 48 feet bgs (-28 80 feet msl) The groundwater flow was generally easterly to southeasterly at a gradient of approximately 0 004 feet per linear foot • The total depth measurements indicated that an appreciable amount of sediment has infiltrated the air-sparging wells SP-1, SP-4, SP-5, and SP-6 To conduct further sampling or remediation activities at these locations, the air-sparging wells will need to be developed • The benzene concentration increased in the down-gradient well MW-11 Concentrations in the suspected source area were stable or decreased • The current BTEX concentrations were evaluated against the California Drinking Water MCLs Based on the current groundwater monitoring data, the MCL for benzene has been exceeded in wells MW-1, MW-7, MWA 1, SPA, PZ-1, and PZ- 2 The MCL's for toluene and ethylbenzene were exceeded in well SP-1 The MCL for xylenes were exceeded in wells MW-1 and SPA ' The TPH-G concentrations increased in wells MWA , MW-11, SP-1, SP-2, and SP4 The remaining wells remained stable or decreased in concentration • The oxygenate DIPE was detected in wells MW-7 and PZ-1 The oxygenate TBA was detected in well MW-7 • The analyte 1,2-DCA was detected in wells MWA, MW-5, MW-7, MW-8, MWA 2, and SP-5 1,2-DCA was a component of gasoline during the 1980's Based on the current groundwater monitoring data, the MCL for 1,2-DCA has been exceeded in wells MWA , MW-5, MW-7, MW-8, MW-12, and SP-5 1 C23-484517-BOOISAC5R608 Page 9 of 11 September 14, 2005 Copyright 2005 Klemfelder Inc