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Phase II Environmental Site Assessment Report Satellite Apartments 530 N.Stanislaus Street APN 139-224-090 Page 3 3.4 SOIL SAMPLING PROCEDURES Condor collected four (4) surface soil samples from each wall of the exterior of the apartment complex (SS-1 S,SS-2E,SS-3N,and SS-4W)using non-dedicated sampling equipment and laboratory supplied glass jars. Each collected soil sample was submitted to the laboratory for analysis of chlorinated pesticides by EPA Method 8081B. 4.0 LABORATORY ANALYTICAL RESULTS 4.1 SOIL GAS The following VOCs were detected at or above the laboratory reporting limits in the soil gas samples collected from ASG-1 and ASG-2: 1,2,4-trimethylbenzene at ASG-1 (3.0 micrograms per cubic meter [µg/m3])and ASG-2 (2.5 µg/m3); 2-butanone at ASG-1 (270 µg/m3) and ASG-2 (220 µg/m3); 2-hexanone at ASG-1 (29 µg/m3)and ASG-2(27 µg/m3);4-methyl-2-pentanone at ASG-1 (140 µg/m3)and ASG-2(120 µg/m3);acetone at ASG-1 (120 µg/m3)and ASG-2 (110 µg/m3);benzene at ASG-1 (13 µg/m3) and ASG-2 (2.2 µg/m3); ethanol at ASG-1 (100 µg/m3); ethyl benzene at ASG-1 (4.3 µg/m3);Freon 113 at ASG-1 (6.2 µg/m3); m,p-Xylene at ASG-1 (12 µg/m3) and ASG-2 (5.3 µg/m3); o-xylene at ASG-1 (3.6 µg/m3); tetrachloroethene at ASG-1 (6.4 µg/m3); toluene at ASG-1 (28 µg/m3) and ASG-2 (6.9 (µg/m3); and total Xylene at ASG-1 (16 µg/m3) and at ASG-2 (5.3 µg/m3). Laboratory analytical results for collected soil gas samples are included on Table A,Appendix C. 4.2 SUB-SLAB SOIL GAS No VOC concentrations were detected at or above the laboratory reporting limits in the sub-slab soil gas samples except for chloroform at Sub-2 (7.2 ug/m3). Laboratory analytical results for collected sub-slab soil gas samples are included on Table A,Appendix C. 4.3 SOIL The following OCPs were detected at or above the laboratory reporting limits in surface soil samples: chlordane(technical) at SS-IS(8.9 mg/kg), SS-2E(5.5 mg/kg),and SS-3N(18 mg/kg);a-chlordane at SS- IS (1.1 mg/kg), SS-2E(0.54 mg/kg), SS-3N(1.3 mg/kg),and SS-4W(0.012 mg/kg); g-chlordane at SS-1S (1.2 mg/kg),SS-2E(0.56 mg/kg),SS-3N(1.5 mg/kg),and SS-4W(0.0057 mg/kg);p,p-DDT at SS-2E(0.06 mg/kg), and SS-3N (0.13 mg/kg); and dieldrin at SS-lS (0.34 mg/kg), SS-2E (0.35 mg/kg), and SS-3N (0.45 mg/kg). Laboratory analytical results for collected soil samples are included on Table B,Appendix C. 5.0 HUMAN HEALTH RISK ASSESSMENT 5.1 VOLATILE ORGANIC COMPOUNDS (VOCS) Condor compared soil gas concentrations to soil vapor screening levels calculated using the most recent U.S. Environmental Protection Agency's Regional Screening Levels for residential indoor air (USEPA RSLs) or the Department of Toxic Substances Control (DTSC) Human Health Risk Assessment(HHRA) Note 3 DTSC-Modified Screening Levels,June 2020,revised May 2022 (DTSC-SLs) for indoor air. The USEPA and DTSC do not have published risk-based screening levels assigned to soil gas media. However, DTSC has provided guidance on converting DTSC-SLs for VOCs in indoor air to soil vapor �/► CONDOR