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4.5 Documented Contaminant Concentrations <br /> Constituent Soil (mg/kg) RWQCB Water(ug/1) RWQCB <br /> Region 2 Region 2 . <br /> Before After ESL Before After <br /> I <br /> ESL <br /> (-g/kg) <br /> TPH-gas NA NA NA NA NA NA <br /> TPH-diesel 9100 . 110 100 NA 110 100 <br /> benzene <.25 <.05 ND NA <0.5 6400 <br /> toluene 0.05 <0.5 2.9 NA <0,5 53000 <br /> ethylbenzene x.25 <0-5 3.3 NA <0.5 17000 <br /> xylene 0.04 <0.5 2.3 NA <0.5 16000 <br /> MTBE =NA 0.26 0.023 NA 15000 <br /> 1,2-DCA NA NA 0.67 NA <0.5 0.5 <br /> 1,2-EDB NA ?, NA 0.0003 NA <0.5 0.05 <br /> Summary: Soil before represents highest concentrations found in soil borings in 1999. Soil after represents highest <br /> concentrations measured from soil boringsdrilledin 2008. <br /> Notes: 1. "Before" concentrations are from Upgradient(1999) except where noted. <br /> 2. "After" concentrations are from Muir(2008c) <br />'4 <br /> 31 "RWQCB Region 2 Environmental Screening Levels with assumption of commercial/industrial land use <br /> E and low-permeability soils. <br /> 4. "Water ESL's revert to Maximum Contaminant Levels (MCL's) where no ESL is present <br /> Environmental\STE1pARSCR09102008.wpd 26 <br />