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Table 3. Exposure Parameters Used to Estimate Indoor Air Risks and Hazards, Chevron Fuel Terminal 1001621, Banta, California <br /> Parameter Symbol Unitsn25 <br /> Source <br /> Infinite source building concentration Cbu;imnu9/m3 GW-SCREEN Model <br /> Inhalation rate-adult workers IRA„, m3/day DTSC, 1992 <br /> Exposure frequency-worker EF„, days/year DTSC, 1992 <br /> Exposure duration-worker EDw years DTSC, 1992 <br /> Averaging time-adult(carcinogens) ATS days 25,550 USEPA, 1989 <br /> Averaging time-worker(noncarcinogens) ATnc_„, days 9,125 ED x 365 <br /> Conversion factor CF Ng/mg 1,000 _ <br /> Body weight-adult BWaduu kg 70 USEPA, 1989; DTSC, 1992 <br /> Note: <br /> The USEPA(2003)GW-SCREEN model Version 3.0 was modified by Cal/EPA's HERD on 1/21/05. <br /> 7/18/2007 Page 1 of 1 <br /> G:\DIV 11\D0007\1001621_004711100_Tier I RBCA Evaluation_Tables.xls <br />