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TABLE 22 <br /> ESTIMATED INHALATION RISKS DUE TO <br /> INDOOR VAPOR INTRUSION FROM GROUNDWATER <br /> US CAN—WELTY ROAD <br /> 35275 Welty Road <br /> Vernalis,California <br /> Estimated <br /> COPC Cw(µg/L) Inhalation Risk <br /> BTEX <br /> Benzene 0.6 2.4E-07 <br /> Eth lbenzene 5.9 2.4E-07 <br /> Total Xylenesi 1.9 <br /> -X lene NA <br /> PAHs <br /> Acenaphthene 18 NA <br /> Benzo(b)fluoranthene 3.1 8.2E-09 <br /> Chrysene 24 3.4E-09 <br /> Fluorene 100 NA <br /> Meth lna hthalenes 0.093 NA <br /> Naphthalene 14 3.5E-07 <br /> Pyrene 13 NA <br /> Total Estimated Risk: 8.4E-07 <br /> Abbreviations: <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> Cal/EPA=California Environmental Protection Agency <br /> COPC=Constituent of potential concern <br /> Cw=Concentration in groundwater <br /> DTSC=Department of Toxic Substances Control <br /> PAHs=Polynuclear aromatic hydrocarbons <br /> VOCs=Volatile organic compounds <br /> gg/L=Micrograms per liter <br /> Model Source: <br /> Screening-Level Model for Groundwater Contamination,Version 3.0;04/03 <br /> (last modifieffebruary 2009). Cal/EPA DTSC. <br /> hitp://www.dtsc.ca.gov/AssessingRisk/JE Models.cfffi <br /> 1. The hazard from exposure to total xylenes in groundwater could not be <br /> calculated so it was assumed that all xylenes were in the form of p-xylene to <br /> most conservatively estimate the health hazard from xylenes. <br /> Page 1 of 1 SAIE, <br />