ARCHIVED REPORTS XR0000023 - Laserfiche WebLink

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KLEINFELDER The TPH-G concentrations Increased in wells MW-1 , MW-12, SP-1, SP-2, SP-4, and SP-6 The remaining wells remained stable or decreased in concentration The detectable TPH-G concentrations ranged from 190 lag/L at well MW-12 to 24,000 lag/L at well SP-1 The current BTEX concentrations were evaluated against the California Drinking Water Maximum Contaminant Levels (MCL)s The MCLs in groundwater are benzene (1 lag/L), toluene (150 pg/L), ethylbenzene (700 pg/L), and xylenes (1,750 lag/L) Based on the current groundwater monitoring data, the MCL for benzene has been exceeded in wells MW-1, MW-7, SP-1, and PZ-1 The MCL for toluene was exceeded in wells SP-1 and PZ-1 The MCL for ethylbenzene was exceeded in well SP-1 The MCL for xylenes were exceeded in wells MWA and SP-1 O 2 4 OXYGENATES AND 1,2-DCA ANALYTICAL RESULTS The analyte DIPE was the only oxygenate with detectable concentrations The analyte DIPE was detected in wells MW-7, MW-12, and PZ-1 There were no detectable oxygenates measured in the remaining wells The concentrations for DIPE ranged from 1 1 2 ug/L in well MW-12 to 43 lag/L in well PZ-1 The analyte 1,2-DCA was detected in wells MW-7, MW-8, MW-12, and SP-5 The concentrations ranged from 0 79 ug/L in well SP-5 to 6 0 lag/L in well MW-7 The oxygenate MTBE and 1,2-DCA concentrations were evaluated against the California Drinking Water Maximum Contaminant Levels (MCL)s The MCLs in groundwater are MTBE (13 lag/L) and 1,2-DCA (0 5 lag/L) Based on the current groundwater monitoring data, the MCL for 1,2-DCA has been exceeded In wells MW-7, MW-8, MW-12, and SP-5 The MCL for MTBE was not exceeded C23-484517-BOO/SAC5R609 Page 9 of 12 September 14, 2005 Copyright 2005 Kleinfeider, Inc