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UNCONTROLLED SOIL AERATION <br /> HEALTH RISK ASSESSMENT <br /> FACILITY NAME: Roux Associates <br /> Contact Person: Paul Supple <br /> Tel.ephorie: .(510} 602-2333 <br /> LOCATION: ARCO Products Co. , Facility 2093 <br /> 3425 Tracy Boulevard, Tracy, CA 95376 <br /> MAILING ADDRESS: 1855 Gateway Boulevard, Suite 770 <br /> Concord, CA 94520 <br /> HEALTH RISK CALCULATION - SCREEN 1. 1 MODEL <br /> S1IlCC'" t 'i2'""'k'GCn4l.'3n �`Of 41` 'r OpOS'ed Ste. e-,"':f'Or"?"tii COI`rtrO -1'2d'-�tsJi1 <br /> aeration of gasoline contaminated soil- is located .within 1000 feet <br /> of a residence, a SCREEN-1. 1 model will be run to- determine the <br /> health risks. The highest concentration will be used to determine <br /> the health risk for the worst case situation. <br /> Gasoline Emissions Calculations <br /> Max. Hydorcarbon Concentration: 810 ppm <br /> Volume of Contaminated Soil: 100 yd' <br /> Average Molecular Weight of Gasoline: 66 lb/lb-mole <br /> Estimated Density of the Soil: 2700 lbs/yd3 <br /> Expected Length of Project: 7 days (0. 01918 yr) <br /> f <br /> .Emissions = [Concentration (ppm) X Volume of Contaminated Soil <br /> (yd 3) X Density of Soil (lbs/yd3) Length of <br /> Project days) <br /> _ (810 x10 ) (100 yd 3} (2 , 700 lb/yd.) / (7 days) <br /> = 31.24 (lbs/day) <br /> 0. 16 (g/sec) <br /> 1 <br /> Cancer Risk Calculations <br /> The formula which determines cancer risk is: <br /> Cancer risk, R = (L/70) (X) (UR) (0. 1) <br /> (CAPCOA Toxic Assessment Manual S 3 . 5-4) <br /> Where: <br /> L = length of the project in years <br /> X = maximum hourly concentration in Ag/m3 (from SCREEN-1. 1 model) <br /> UR = unit risk value of the substances in question (CAPCOA Risk <br /> Assessment Guidelines, table III-6) <br /> 1. 2 x 10-6 m3/µg for gasoline <br /> 0. 1 = conversion factor to convert to yearly concentration from <br /> hourly concentration. i <br /> R = (0. 0192/70) (3194 gg/m3) (1. 2 x 10-6 m3/µg) (0. 1) ; <br /> = 0. 11 X 10-6 <br /> i <br /> f <br />