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screening levels, a deed restriction including land use covenants may be a part of anticipated regulatory Site closure if residual COPC exceed residential screening levels. The project proponents understand that land use covenants are not irrevocable and that land use covenants could be revised in the future if analytical data indicates impacted media are equal to or less than residential screening levels. May 2016 United States Environmental Protection Agency Regional Screening Levels The May 2016 United States Environmental Protection Agency (USEPA) Regional Screening Levels(RSLs)presented in the Generic Tables are chemical-specific concentrations for individual contaminants in air, drinking water and soil that may warrant further investigation or Site cleanup. Partner proposes that the analytical results of soil gas and soil samples, specifically,VOCs,PAHs, PCBs, OCP, and metals, be compared to the May 2016 RSLs. February 2016 Environmental Screening Levels The San Francisco Bay RWQCB has established regulatory agency guidance, Environmental Screening Levels (ESLs), as an initial screening level evaluation for sites in Region 2. ESLs are utilized to assess potential threats to human health, terrestrial/aquatic habitats, and/or drinking water resources due to contaminants in soil, soil gas, and/or groundwater. Under most circumstances,the presence of contamination below applicable ESLs can be considered to not pose a significant, chronic (i.e., long-term) adverse risk to the applicable receptor of concern. Conversely, sites that exceed ESLs generally require further evaluation and/or remediation. The ESLs were developed using default assumptions (e.g., standard exposure factors) and, consequently, are only meant for screening level assessments. The ESLs should not be considered enforceable regulatory standards. Cleanup levels ultimately depend on site-specific factors and are established by the regulatory agencies on a case-by-case basis. According to the January 1994 DTSC Preliminary Endangerment Assessment Manual (revised October 2015), if the DQOs of the investigation are limited to reporting TPH as gasoline, diesel and motor oil, the 2013 Region 2 residential health-risk-based ESLs may be used for screening purposes. As noted above, the screening levels that apply to existing and foreseeable future land use for the Site are commercial/industrial. Therefore, Partner proposes that the screening levels for TPH-g, TPH-d, and TPH-mo be the levels included within Table A-2-Shallow Soil Screening Levels (<3m bgs), Commercial/Industrial Land Use (where groundwater is a current or potential drinking water source). February 27, 2015 California Maximum Contaminant Levels Sampling and Analysis Workplan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 31