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I <br /> 1 <br /> iTABLE 2 <br />' DEFAULT AND SITE-SPECIFIC INPUT PARAMETERS <br /> SAN JOAQUIN COUNTY HUMAN SERVICES ADMINISTRATION <br /> SAN JOAQUIN, CALIFORNIA <br /> I <br /> Parameter Units Site-Specific Parameters Comments <br />' Vapor Intrusion Modeling Parameters <br /> Average Groundwater Average of temperatured data for <br />' Temperature Celsius 19 Central California (EPA,2000) <br /> Depth Below Grade to Bottom of <br /> Enclosed Space Floor cm 100 Site-specific(half-basement) <br /> Average of depth data from MW- <br /> 2 and MW-2A from May 2001 <br /> Depth Below Grade to Water sampling event(WESTON, <br /> Table cm 817 2001) <br />' Vadose Zone SCS Soil Type - Based on original well boring <br /> Silty Clay lithology data (WESTON, 1992) <br /> SCS Soil Type Directly Above Based on original well boring <br />' Water Table -- Sandy Clay lithology data (WESTON, 1992) <br /> Vadose Zone Soil Dry Bulk Site-specific parameter could not <br /> Density g/cm3 1 5 be obtained <br />' • Site-specific parameter could not Vadose Zone Soil Total Porosity Unitless 043 be obtained <br /> Vadose Zone Soil Water-Filled Site-specific parameter could not <br />' Porosity cm3/cm3 03 be obtained <br /> Human Health Exposure Parameters <br /> California Division of Toxic <br /> Substance Control Board <br />' Averaging Time—Carcinogens days 70 x 365 (CaIEPA, 1996) <br /> California Division of Toxic <br /> Averaging Time— Substance Control Board <br />' Noncarcinogens days 25 x 365 (CaIEPA, 1996) <br /> California Division of Toxic <br /> Substance Control Board <br />' Exposure Duration years 25 (Ca1EPA, 1996) <br /> California Division of Toxic <br /> Substance Control Board <br />' Exposure Frequency days/year 250 (CaIEPA, 1996) <br /> California Division of Toxic <br /> Reference Concentration— Substance Control Board <br /> Benzene ug/m3 006 (OEHHA, 2001) <br />' California Division of Toxic <br /> Substance Control Board <br /> Unit Risk Factor—Benzene (ug/M3)1 2 90E-05 (OEHHA,2001) <br />' California Division of Toxic <br /> Substance Control Board <br /> . Target Hazard—Benzene Unitless 1 (SJAPCD, 2001, CARIB,2001) <br />' California Division of Toxic <br /> Substance Control Board <br /> Target Risk—Benzene Unitless 1 OOE-06 I(SJAPCD,2001, CARB, 2001) <br />