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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 /> the threshold of risk in the view of DTSC. <br /> ASTM—American Society of Testing and Materials <br /> DTSC—Department of Toxic Substances Control <br /> DTSC Modified SL—DTSC 1 Modified Air Screening Levels,Human Health Risk Assessment Note 3(DTSC,June 2020),modified from November 2019 USEPA RSLs. <br /> USEPA—United States Environmental Protection Agency method <br /> USEPA RSL—Regional Screening Level,USEPA May 2020 <br /> Page 3 of 3 <br />