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TABLE 21 CALIFORNIA DTSC SCREENING-LEVEL MODEL FOR GROUNDWATER CONTAMINATION: SOIL AND BUILDING PARAMETERS US CAN—WELTY ROAD 35275 Welty Road Vernalis,California Model Input Parameters Source Building type Future building with a basement Most conservative scenario for future buildings Depth below grade to bottom of enclosed space floor,LF cm 15 DTSC/Cal-EPA model default Depth below grade to water table,LWT(cm) 1041 Site specific-from groundwater monitoring data Soil type directly above water table SL Sitespecific-from soil and groundwater investigation reports__ Average soil/groundwater temperature,Ts 19.5 DTSC/Cal-EPA model default Average vapor flow rate into building,Qsoil(L/m) 5 DTSC/Cal-EPA model default Vadose zone soil type SL Site specific-from soil and groundwater investigation reports Vadose zone dry bulk density by(g/cm) 1.62 DTSC/Cal-EPA model default for soil type Vadose zone soil porosity nv(unitless) 0.387 DTSC/Cal-EPA model default for soil type Vadose zone soil water-filled porosity OWv(cm3/cm) 0.103 DTSC/Cal-EPA model default for soil type Averaging time for carcinogens ATS(years) 70 DTSC/Cal-EPA model default Averating time for noncarcinogens,ATNF(years) 30 DTSC/Cal-EPA model default Exposure Duration,ED(years) 30 DTSC/Cal-EPA model default Exposure Frequency,EF(days/year) 350 DTSC/Cal-EPA model default Abbreviations: Cal/EPA=California Environmental Protection Agency cm=Centimeters cm3/cm3=Cubic centimeter per cubic centimeter DTSC=Department of Toxic Substances Control g/cm3=Grams per cubic centimeter L/m=Liters per meter SIC=Silty Clay SCS=Soil Classification System Model Source: Screening-Level Model for Groundwater Contamination,Version 3.0;04/03 (last modified February 2009). Cal/EPA DTSC. htW://www.dtsc.ca.gov/AssessingRisk/JE Models.cfin Page 1 of 1 SAIC