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Table C-4:Screening Levels for Air Sample Analyses Geosyntec D <br /> Quality Assurance Project Plan consultants <br /> Park Woods Shopping Center <br /> Stockton,California <br /> DTSC DTSC <br /> Chemical Abstracts Modified SL Modified SL USEPA RSL USEPA RSL <br /> Analyte Service Registry Method for for Industrial for Residential for Industrial <br /> Number Residential Airy /rn3 Air(µg/m3) Air(µg/m3) <br /> Air (µg/m) (µg ) <br /> Benzene 71-43-2 TO15/TO-15 SIM 0.097 0.42 0.36 1.6 <br /> 1,1,1-Trichloroethane(methyl chloroform) 71-55-6 TO15/TO-15 SIM 1000 4400 520 2200 <br /> Bromomethane(methyl bromide) 74-83-9 TO15/TO-15 SIM 0.52 2.2 <br /> Chloromethane(methyl chloride) 74-87-3 TO15/TO-15 SIM 9.4 39 <br /> Chloroethane(ethyl chloride) 75-00-3 TO15/TO-15 SIM 420 1800 <br /> Chloroethene(vinyl chloride) 75-01-4 TO15/TO-15 SIM 0.0095 0.16 0.17 2.8 <br /> Dichloromethane(methylene chloride) 75-09-2 TO15/TO-15 SIM 1 12 63 260 <br /> Carbon disulfide(methanedithione) 75-15-0 TO15/TO-15 SIM 73 310 <br /> Ethylene oxide 75-21-8 TO15/TO-15 SIM 0.00034 0.0041 <br /> Tribromomethane(bromoform) 75-25-2 TO15/TO-15 SIM 2.6 11 2.6 11 <br /> Bromodichloromethane 75-27-4 TO15/TO-15 SIM 0.076 0.33 0.076 0.33 <br /> 1,1-Dichloroethane(ethylidene chloride) 75-34-3 TO15/TO-15 SIM 1.8 7.7 1.8 7.7 <br /> 1,1-Dichloroethene(vinylidene chloride) 75-35-4 TO15/TO-15 SIM 73 310 21 88 <br /> 2-Methyl-2-propanol(tert-butyl alcohol,TBA) 75-65-0 TO15/TO-15 SIM 520 2200 <br /> Trichlorofluoromethane(Freon 11) 75-69-4 TO15/TO-15 SIM 1300 5300 - <br /> Dichlorodifluoromethane(Freon 12) 75-71-8 TO15/TO-15 SIM 10 44 <br /> 1,1,2-Trichlorotrifluoroethane(Freon 113) 76-13-1 TO15/TO-15 SIM 520 2200 <br /> 1,2-Dichloropropane(propylene dichloride) 78-87-5 TO15/TO-15 SIM 0.42 1.8 <br /> 2-Butanone(methyl ethyl ketone,MEK) 78-93-3 TO15/TO-15 SIM 520 2200 <br /> 1,1,2-Trichloroethane 79-00-5 TO15/TO-15 SIM 0.021 0.088 <br /> 1,1,2-Trichloroethene(trichloroethylene) 79-01-6 T015/TO-15SIM 0.21 0.88 <br /> 1,1,2,2-Tetrachloroethane(tetrachloroethane) 79-34-5 TO15/TO-15 SIM 0.048 0.21 0.048 0.21 <br /> Methyl methacrylate(methyl 2-methylprop-2-enoate) 80-62-6 TO15/TO-15 SIM 73 310 <br /> Hexachlorobutadiene(hexachloro-1,3-butadiene) 87-68-3 TO15/TO-15 SIM 0.13 0.56 0.13 0.56 <br /> Naphthalene(naphthene) 91-20-3 TO15/TO-15 SIM 0.083 0.36 <br /> o-Xylene(1,2-xylene) 95-47-6 TO15/TO-15 SIM 10 44 <br /> 2-Chlorotoluene(1-chloro-2-methylbenzene) 95-49-8 TO15/TO-15 SIM 83 350 <br /> o-Dichlorobenzene(1,2-dichlorobenzene) 95-50-1 TO15/TO-15 SIM 21 88 <br /> 1,2,4-Trimethylbenzene(pseudocumene) 95-63-6 TO15/TO-15 SIM 6.3 26 <br /> tert-Butylbenzene 98-06-6 TO15/TO-15 SIM 420 1800 <br /> Isopropylbenzene(cumene) 98-82-8 TO15/TO-15 SIM -- 42 180 <br /> Helium 7440-59-7 JASTMD1946 <br /> Notes: <br /> --not applicable <br /> µg/m3-micrograms per cubic meter <br /> For soil vapor and sub-slab samples,an attenuation factor of 0.03 will be used on the ambient air screening levels(screening level/0.03) <br /> 1-Department of Toxic Substances Control(DTSC)Human Health Risk Assessment(HHRA),June 2020. <br /> The HHRA value is not intended for use as a cleanup goal or as a trigger level. HHRAs are levels of the chemical that are below <br /> Page 2 of 3 <br />