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KLEINFELDER <br />' 3 SUMMARY AND RECOMMENDATIONS <br /> • <br /> Groundwater monitoring has been conducted at this facility since 1987 to evaluate <br /> groundwater quality A summary of the current site conditions and a recommendation <br /> ' for subsequent work are as follows <br /> • During this event, the average depth to groundwater among the wells was 45 03 <br /> feet bgs (-28 36 feet msl) The groundwater flow was generally easterly to <br /> 1 southeasterly at a gradient of approximately 0 003 feet per linear foot <br /> ' . The total depth measurements indicated that an appreciable amount of sediment <br /> has infiltrated the air-sparging wells SP-1, SP-5, and SP-6 To conduct further <br /> ' sampling or remediation activities at these locations, the air-sparging wells will <br /> need to be developed <br /> ' . The benzene concentration increased in the down-gradient wells MW-1, MW-7, <br /> MW-11, SP-1, and PZ-1 Concentrations in the remaining wells were stable or <br /> decreased in concentration --� <br /> Y The current BTEX concentrations were evaluated against the California Drinking <br /> Water MCLs Based on the current groundwater monitoring data, the MCL for <br /> benzene has been exceeded in wells MW-1, MW-7, SP-1, PZ-1, and PZ-2 -The <br /> ' MCL for toluene was exceeded in well PZ-1 The MCL for ethylbenzene was not <br /> exceeded in any wells The MCL for xylenes was exce d d I well SP-1 <br /> a (G <br /> t . The TPH-G concentrations did not increase in any wells The wells remained <br /> stable or decreased in concentration <br /> The oxygenate DIPS was detected in well MW-7 <br /> The analyte 1,2-DCA was detected in wells MW-7, MW-8, MW-12, and SP-5 <br /> 1,2-DCA was a component of gasoline during the 1980's Based on the current <br /> ' groundwater monitoring data, the MCL for 1,2-DCA has been exceeded in wells <br /> MW-7, MW-8, MW-12, and SP-5 <br /> C23-484517-BOOISAC5R610 Page 10 of 12 September 14, 2005 <br /> ' Copyright 2005 Kleinfeider Inc <br />