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Table 2. Downhole Soil Gas Target Levels and Reporting Limits by TO-15 <br /> Analyte Tier 1 Reporting HHRA Note 3b HHRA Note 3b <br /> ESL Limit' Residential HERO Industrial HERO <br /> Volatile Organic Compounds . . • <br /> 1,1,1-Trichloroethane 35,000 2.7 NS NS <br /> 1,1,2,2-Tetrachloroethane 1.6 3.4 0.048 0.21 <br /> 1,1,2-Trichloroethane 5.8 2.7 NL NL <br /> 1,1-Dichloroethane 58 2.0 1.8 7.7 <br /> 1,1-Dichloroethene 2,400 2.0 NS NS <br /> 1,2-Dibromoethane EDB 0.16 3.8 0.0047 0.02 <br /> 1,2-Dichloroethane 3.6 2.0 NL NL <br /> Benzene 3.2 1.6 0.097 0.42 <br /> Carbon tetrachloride 2.2 3.1 0.47 2.0 <br /> Chloroethane 350,000 5.3 NL NL <br /> Chloroform 4.1 2.4 NL NL <br /> Chloromethane 3,100 10 NL NL <br /> cis-1,2-Dichloroethene 280 2.0 NS NS <br /> Dichlorodifluoromethane NS 2.5 NL NL <br /> Freon 12 <br /> Eth (benzene 37 2.2 NL NL <br /> MTBE 360 1.8 NL NL <br /> o-X lene 3,500 2.2 NL NL <br /> /m-X lene 3,500 2.2 NL NL <br /> Tetrachloroethene 15 3.4 0.46 2.0 <br /> Toluene 10,000 1.9 NS NS <br /> trans-1,2-Dichloroethene 2,800 2.0 NS NS <br /> Trichloroethene 16 2.7 NL NL <br /> Vinyl chloride 0.32 1.3 0.0095 0.16 <br /> Notes: <br /> a.Base reporting limit(based on no dilution). <br /> b. HHRA Note 3 June 2020,Table 3: DTSC-recommended screening levels for ambient air analytes;Cancer enpoint <br /> pg/m3=micrograms per cubic meter <br /> bold=reporting limit higher than ESL;all detections will be reported to the limit of detection <br /> ESL=environmental screening level <br /> HERO=Human and Ecological Risk Office <br /> HHRA=Human Health Risk Assessment <br /> NS=No Standard <br /> NL=Not Listed <br /> Screening level for residential air(pg/m^3);Cancer endpoint <br /> Screening level for commercial/industrial air(Ng/m"3);Cancer endpoint <br />