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Table 2. Input Parameters Used to Estimate Indoor Air Risks and Hazards, Chevron Fuel Terminal 1001621, Banta, California <br /> Parameter Value Units Source <br /> Maximum groundwater concentration, Cy,„ Chemical-specific pg/L Measured(Table 1) <br /> Depth below grade to bottom of enclosed space floor' 15 cm Model default <br /> Average soil/groundwater temperature 16.67 (62) °C(°F) DTSC, 20042 <br /> Vadose zone SCS soil type Clay Loam (CL) - USDA 2007 Soil Conservation Survey <br /> Average vadose zone soil dry bulk density 1.48 g/cm3 Model default <br /> Average vadose zone total porosity 0.442 unitless Model default <br /> Average vadose zone soil water-filled porosity 0.168 cm3/Cm3 Model default <br /> Average depth below grade to water table 5.41 (164.74) feet(cm) Measured(Table 1) <br /> Notes: <br /> 'Assumes slab-on-grade building foundation for onsite workers. <br /> 2 Based on an isothermal contour line from Figure A-1 Groundwater Temperatures for California. <br /> 3 Based on depths to water from four most recent groundwater monitoring results for MW-69UA. <br /> 7/18/2007 Page 1 of 1 <br /> G:\DIV 1 1\D0007\1001621004711100 Tier I RBCA Evaluation Tables.xls <br />