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I <br /> TABLE 23 <br /> ESTIMATED INHALATION HAZARDS DUE TO <br /> INDOOR VAPOR INTRUSION FROM GROUNDWATER <br /> US CAN—WELTY ROAD <br /> 35275 Welty Road <br /> Vernalis,California <br /> Estimated Inhalation <br /> BTEX COPC Tw(µ /L) Hazard ' <br /> Benzene 0.6 6.5E-04 <br /> Eth lbenzene 5.9 2.2E-04 <br /> Total Xylenes 1.9 <br /> -X lene 1.3E-03 <br /> PAHs <br /> Acenaphthene 18 3.2E-05 <br /> Benzo(b)fluoranthene 3.1 NA <br /> Chrysene 24 NA ' <br /> Fluorene 100 1.0E-04 <br /> Meth lna hthalenes 0.093 9.8E-06 <br /> Na hthalene 14 7.9E-03 <br /> jPyrene 13 2.2E-06 t <br /> Total Estimated Hazard: 1.0E-02 <br /> Abbreviations: ' <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> CaUEPA=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 /> µg/L=Micrograms per liter <br /> Notes: <br /> 1. The CaUEPA DTSC vapor intrusion model does not address total xylenes so <br /> p-xylene was used along with the maximum detected concentration for total <br /> xylenes to most conservatively estimate inhalation hazard. <br /> Model Source: <br /> Screening-Level Model for Groundwater Contamination,Version 3.0;04/03 <br /> (last modified February 2009). Cal/EPA DTSC. <br /> httu://www.dtsc.ca.gov/AssessingRisk/JE Models cfm <br /> Page 1 of 1 SAIE <br />