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i i Table A. Environmental Screening Levels(ESLs) Shallow Soils (53m bgs) Groundwater IS Current or Potential Source of Drinking Water 'shallow Solt Commercial! =Residential Industrial Land Use land Use Only 'Groundwater k Chemical (mglkg) (mg/kg) (ug1L) Naphthalene 1.3E+00 2.8E+00 1.7E+01 Nickel 1.5E+02 1.5E+02 1,0E+02 Pentachloropheno€ 3.0E+00 5.0E+00 1.0E+00 Perchlorate 1.1E+01 1.3E+02 6.0E+00 Phenanthrene 4.0E+01 4.0E+01 2.1E+02 Phenol 7.6E-02 7.6E-02 5.0E+00 Polychlarinated biphenyls(PCBs) 8.9E-02 3.0E-01 5.0E-01 Pyrene 5-0E+02 1.0E+03 6.8E+01 Selenium 1.0E+01 1.0E+01 5.0E+01 Silver 2.0E+01 4.0E+01 3.5E+01 Styrene 1.5E+00 1.5E+00 1.0E+01 tert-Butyl alcohol 1.0E-06 1,1,1,2-Tetrachloroethane 2.4E-02 2.4E-02 1.3E+00 1,1,2,2-Tetrachloroethane 1.8E-02 1.8E-02 1.0E+00 etrachloroethene 3.4E-01 7.0E-01 5.0E+00 Thallium 1.2E+00 1.5E+01 2.0E+00 i Toluene 2.9E+00 2.9E+00 4.0E+01 oxo hene 4.6E-01 1.8E+00 3.01+00 PH(gasolines) 8.3E+01 8.3E+01 1.0E+02 '• PH(middle distillates) 8.3E+01 8.3E+01 1.0E+02 PH residual fuels) 4.1E+02 2.5E+03 1.0E+02 1,2,4-Trichlorobenzene 1.5E+00 1.5E+00 5.0E+00 1,1,1-Trichloroethane 2.5E+01 2.5E+01 2.0E+02 1,1,2-Trichloroethane 7.0E-02 7.0E-02 5.0E+00 i richloroethene 4.6E-01 4.6E-01 5.0E+00 i 2,4,5-Trichlorophenol 3.2E+00 3.2E+00 2.0E+02 4,6-Trichlorophenol 2.3E-01 2.3E-01 7.0E-01 Vanadium 1.5E+01 1.9E+02 1.5E+01 Vinyl chloride 2.1E-02 4.7E-02 5-0E-01 Xylenes 2.3E+00 2.3E+00 2.0E+01 inc 6.0E+02 6.0E+02 5.0E+03 Notes: 1.Shallow soils defined as soils less than or equal to 3 meters(approximately 10 feet)below ground surface. Category"Residential Land Use"generally considered adequate for other sensitive uses(e.g.,day-care centers,hospitals,etc.) 3.Assumes potential discharge of groundwater into a freshwater,marine or estuary surface water system. Soil ESLs intended to address direct-exposure,groundwater protection,ecologic(urban areas)and nuisance concerns under noted land-use scenarios. Soil gas data should be collected for additional evaluation of potential indoor-air impacts at sites with significant areas of VOC-contaminated soil. Groundwater ESLs intended to be address drinking water,surface water,indoor-air and nuisance concerns. Use in conjunction with soil gas screening levels to more closely evaluate potential impacts to indoor-air if groundwater screening levels for this concern approached or exceeded. Aquatic habitat goals for bioaccumulation concerns not considered in selection of groundwater goals. Soil and water ESLs for ethanol based on gross contamination concerns. PH-Total Petroleum Hydrocarbons. TPH ESLs must be used in conjunction with ESLs for related chemicals(e.g.,BTEX,PAHs, oxidizers,etc.). INTERIM FINAL-November 2007 SF Bay RWQCB Page 3 of 3 Summary Table A