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TABLE 1. ENVIRONMENTAL SCREENING LEVELS (ESLs) <br /> Indoor Air and Soil Gas <br /> (Vapor Intrusion Concerns) <br /> INDOOR AIR 2SHALLOW SOIL GAS <br /> SCREENING LEVELS SCREENING LEVELS <br /> Commercial/ ommeraa <br /> 'Residential Industrial 'Residential Industrial <br /> Land Use Land Use Only Land Use Land Use Only <br /> CHEMICAL PARAMETER (ug/m3) (ug/m3) (ug/m3) (ug/m3) <br /> Electrical Conductivity <br /> (mS/cm, USEPA Method 120.1 MOD) not applicable not applicable not apploicable not applicable <br /> Sodium Adsorption Ratio not applicable I not applicable not applicable I not applicable <br /> Red: Updated with respect to ESLs presented in July 2003 document. <br /> Notes: <br /> 1.Category"Residential Land Use"generally considered adequate for other sensitive uses(e.g.,day-care centers,hospitals,etc.) <br /> 2.Soil Gas: Screening levels based on soil gas data collected less than 1.5 meters(five feet)below a building foundation or the <br /> ground surface. Intended for evaluation of potential indoor-air impacts. <br /> Soil gas data should be collected and evaluated at all sites with significant areas of VOC-impacted soil.Screening <br /> levels also apply to areas over of impacted groundwater. <br /> Source of soil ESLs:Refer to Tables E-2 and E-3 in Appendix 1. <br /> TPH-Total Petroleum Hydrocarbons. TPH ESLs must be used in conjunction with ESLs for related chemicals(e.g., BTEX, PAHs, <br /> oxidizers,etc.). See Volume 1,Section 2.2 and Appendix 1,Chapter 5. <br /> Source: INTERIM FINAL- February 2005 <br /> SF Bay Regional Water Quality Control Board <br /> Page 4 of 4 <br />