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Table 1. Concentrations of VOCs in Soil Gas <br /> 3081 North Tracy Boulevard <br /> Tracy, CA 95376 <br /> • • • 1 11 1 1 1 <br /> • • • 11 1 1 1 . <br /> • I •ne • - <br /> •• <br /> 5/30/19 <20 <20 <20 <20 <20 <20 <20 <40 <20 ND <br /> 2/21/20 <8 <8 <8 <8 <8 <8 <8 <16 <8 N D <br /> SG34 5 9/15/20 11 <8 <8 <8 <8 <8 <8 <16 <8 DCFM: 10 <br /> Chloroform: 74 <br /> 6/11/21 23 15 <8 <8 <8 <8 <8 <16 <8 DCFM: 41 <br /> Methylene Chloride: 10 <br /> 5/30/19 <20 <20 <20 <20 <20 <20 <20 <40 <20 ND <br /> 2/21/20 73 <8 <8 <8 <8 <8 <8 <16 <8 ND <br /> SG35 5 9/15/20 258 <8 <8 <8 <8 <8 <8 <16 <8 ND <br /> 6/11/21 100 12 <8 <8 <8 <8 <8 <16 <8 Chloroform: 71 <br /> DCFM: 43 <br /> 9/15/20 <8 <8 <8 <8 <8 <8 <8 <16 <8 ND <br /> SG36 5 DCFM: 27 <br /> 6/11/21 <8 <8 <8 <8 <8 <8 <8 <16 <8 <br /> Methylene Chloride: 10 <br /> 9/15/20 17 <8 <8 <8 <8 <8 <8 <16 <8 ND <br /> SG37 5 9/15/20 13 <8 <8 <8 <8 <8 <8 <16 <8 ND <br /> 6/11/21 19 <8 <8 <8 <8 <8 <8 <8 <8 DCFM: 25 <br /> Methylene Chloride: 8 <br /> SG38 5 9/16/20 No Flow <br /> SG39 5 9/16/20 62 <8 <8 <8 <8 <8 <8 <16 <8 Chloroform: 15 <br /> n-Butylbenzene: 39.5 <br /> sec-Butylbenzene: 10.5 <br /> Chloroform: 149 <br /> DCFM: 22.4 <br /> 1,1-DCE: 0.4 <br /> 12/1/20 31.5 3.1 <0.4 <0.4 1.5 70.4 26.1 129 108 Trichlorotrifluoroethane: 3.3 <br /> Isopropylbenzene: 4.9 <br /> SG40 5 4-Isopropyltoluene: 11.0 <br /> n-Propylbenzene: 14.1 <br /> Styrene: 3.6 <br /> 1,2,4-Trimethyl benzene: 94.1 <br /> 1,3,5-Trimethyl benzene: 119 <br /> Chloroform: 225 <br /> 6/11/21 13 10 <8 <8 <8 <8 <8 <16 <8 DCFM: 55 <br /> Methylene Chloride: 9 <br /> Chloroform: 34.3 <br /> DCFM: 49.1 <br /> Freon 113: 2.6 <br /> 4-Isopropyltoluene: 0.5 <br /> 12/1/20 32 2.8 <0.4 <0.4 0.7 3.4 1.3 6.1 5.6 n-Propylbenzene: 0.7 <br /> SG41 5 Styrene: 0.4 <br /> Trichlorofluoromethane: 2.2 <br /> 1,2,4-Trimethylbenzene: 2.5 <br /> 1,3,5-Trimethylbenzene: 2.0 <br /> Chloroform: 126 <br /> 6/11/21 16 <8 <8 <8 <8 <8 <8 <16 <8 DCFM: 88 <br /> Methylene Chloride: 11 <br /> Detections are indicated in bold. <br /> Concentrations above the residential ESL are highlighted in yellow. <br /> Concentrations in orange are highlighted in orange. <br /> bgs: below ground surface <br /> 1,1-DCE: 1,1-dichloroethene <br /> DCFM: dichlorodifluoromethane <br /> ND: not detected at or above the laboratory reporting limit <br /> trans-1,2-DCE: trans-1,2-dichloroethene <br /> VOC: volatile organic compound <br /> <X.X: less than the indicated laboratory reporting limit <br /> --: Screening level not available <br /> 'The indicated soil gas screening levels were calculated using the California Department of Toxic Substance Control (DTSC) Human Health Risk Assessment(HHRA) <br /> Note 3 screening levels for ambient air, where available, divided by an attenuation factor of 0.03. If a DTSC screening level was not available, the US Environmental <br /> Protection Agency(US EPA) Regional Screening Level (RSL)was used instead. <br /> Screening Level Sources: <br /> DTSC. HHRA Note 3-DTSC-Modified Screening Levels (DTSC-SLs). Updated June 2020. <br /> US EPA. Regional Screening Levels (TR=1E-06, THQ = 1.0). Updated May 2022. <br />