ARCHIVED REPORTS XR0000029 - Laserfiche WebLink

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KLEINFELDER • MW-11 to 2,500 pg/L at well PZ-1 The remaining analytes varied between the wells Some analytes increased, while others decreased among the wells G� The TPH-G concentrations did not increase in any wells The wells remained stable or ' decreased in concentration The detectable TPH-G concentrations ranged from 120 pg/L at well MW-12 to 16,000 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 pg/L), toluene (150 pg/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, SP-1, PZ-1, and PZ-2 "'The MCL for toluene was exceeded in well PZ-1 -,The MCL for ethylbenzene was not exceeded in any well The MCL for xylenes was exceeded in well SP-1 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 well MW-7 There were no detectable oxygenates measured in ' the remaining wells The concentration for DIPE was 30 pg/L in well MW-7 The analyte 1,2-DCA was detected in wells MW-7, MW-8, MW-12, and SP-5 The ' concentrations ranged from 1 2 pg/L in well MW-12 to 8 1 pg/L in well MW-7 1,2-DCA was a component of gasoline during the 1980's 1 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 pg/L) and 1,2-DCA (0 5 pg/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/SAC5R610 Page 9 of 12 September 14, 2005 Copyright 2005 Klemfelder Inc