ARCHIVED REPORTS XR0000025 - Laserfiche WebLink

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KLEINFELDER ' analytes varied between the wells Some analytes increased while others decreased 1'0 among the wells The TPH-G concentrations increased In wells MW-11, MW-12, SP-1 , SPA and PZ-1 ' The remaining wells remained stable or decreased in concentration The detectable TPH-G concentrations ranged from 160 Ng/L at well MW-12 to 20,000 pg/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 fag/L), toluene (150 lag/L), ethylbenzene (700 pg/L), and xylenes (1,750 pg/L) Based on the current groundwater monitoring data, the MCL for benzene has been exceeded in wells MW-1, MW-7, MW-11, MW-12, SP-1, SP-4, SP-6, PZ-1, and PZ-2 The MCL for toluene and xylenes were exceeded in well SP-1 The MCL for ethylbenzene was not exceeded - i2 4 OXYGENATES AND 1,2-DCA ANALYTICAL RESULTS The analyte DIPE was the only oxygenate with detectable concentrations The analyte was detected In wells MW-7, SP-1, and PZ-1 There were no detectable oxygenates measured In the remaining wells The concentrations ranged from 49 ug/L in well MW-7 to 61 Ng/L In well SP-1 The analyte 1,2-DCA was detected In wells MW-5, MW-7, MW-8, MW-10, MW-12, and SP-5 The concentrations ranged from 0 88 ug/L In well MW-5 to 15 pg/L In well MW-7 The current oxygenate and 1,2-DCA concentrations were evaluated against the California Drinking Water Maximum Contaminant Levels (MCL)s The MCLs in groundwater are MTBE (13 Ng/L) and 1,2-DCA (0 5 pg1L) Based on the current groundwater monitoring data, the MCL for 1,2-DCA has been exceeded in wells MW-5, MWS. MW-7, MW-8, MW-10, MW-12, and SP-5 The MCL for MTBE was not exceeded C23-484517-BOO/SAC5R540 Page 8 of 14 August 11, 2005 Copyright 2005 Kleinfelder Inc