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1 - ��] KLEINFELDER 1 The remaining analytes es varied between the wells Some analytes increase = d while others decreased among the wells The TPH-G concentrations increased in wells MW-1, MW-11, SP-1, SP-2, and SP-4 The remaining wells remained stable or decreased in concentration The detectable TPH-G concentrations ranged from 120 lag/L at well MW-12 to 22,000 lag/L at well SP-1 F 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 Ng/L), ethyl benzene (700 Ng/L), and xylenes (1,750 Ng/L) Based on the current groundwater monitoring data, the MCL for benzene has been exceeded in wells MW-1, MW-7, MW-11, SP-1, PZ-1 , and PZ-2 The MCL for toluene was exceeded in well SPA The MCL for ethylbenzene was exceeded In well SP-1 The MCL for xylenes were exceeded in wells MW-1 and SP-1 2 4 OXYGENATES AND 1,2-DCA ANALYTICAL RESULTS The analytes TBA and DIPE were the only oxygenates with detectable concentrations The analyte TBA was detected In well MW-7 The analyte DIPE was detected in wells MW-7 and PZ-1 There were no detectable oxygenates measured in the remaining wells The concentrations for DIPE ranged from 38 ug/L in well PZ-1 to 67 Ng/L in well MW-7 The analyte 1,2-DCA was detected in wells MW-1, MW-5, MW-7, MW-8, MW-12, and SP-5 The concentrations ranged from 0 65 ug/L in well MW-5 to 15 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 Ng/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 to wells MW-1, MW-5, MW-7, MW-8, MW-12, and SP-5 The MCL for MTBE was not exceeded J C23-484517-BOO/SAC5R608 Page 8 of 11 September 14, 2005 Copyright 2005 Klemfelder, Inc