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ASPECT CONSULTING <br />PROJECT NO. AS190583A-08  MAY 21, 2025 FINAL 65 <br /> <br />Method A soil cleanup levels are applied for TPH irrespective of future land use within <br />the Warehouse Subarea. <br />5.3.3 Air PCLs and Screening Levels <br />For the potential future commercial use of the distribution warehouse, default indoor air <br />and sub-slab soil gas screening levels for the protection of adult commercial workers are <br />applied for indoor air and crawl space soil gas samples collected from the distribution <br />warehouse. Table 5-6 lists the unrestricted Method B PCLs for indoor air and screening <br />levels for sub-slab air as well as the commercial screening levels for indoor air and <br />sub-slab soil gas. For future industrial land use of the distribution warehouse, PCLs for <br />indoor air are the MTCA standard Method C air cleanup levels. The indoor air data and <br />PCLs were evaluated for compliance purposes, whereas the sub-slab air data and <br />screening levels were used for informative/diagnostic purposes with respect to VI <br />contribution to concentrations detected in the indoor air samples.