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No Further Action Request49 0 Section 5 0 Former American Forest Products Facility 2/16/2006 URS Project No 17322736 Page 5-1 • 50 RWQCB TIER 1 ENVIRONMENTAL RISK ASSESSMENT This risk assessment follows procedures developed by the San Francisco Bay Regional Water Quality Control Board (SFB-RWQCB) based on conservative criteria for screening for environmental concerns at sites with contaminated soil and groundwater (SFB-RWQCB, 2005) That document provides conservative environmental screening levels (ESLs) that address direct exposure to soil and potential vapor intrusion into buildings from contaminated soil and/or groundwater The ESLs are based on updated California human health screening levels and revisions to toxicity factors presented with the EPA's preliminary remediation goals According to the SFB-RWQCB, the ESLs are considered to be conservative Under most circumstances, and within the limitations described in the SFB-RWQCB document, the presence of a chemical in soil, soil gas, or groundwater at concentrations below the corresponding ESL can be assumed to not pose a significant, long-term (chronic)threat to human health and the environment The ESLs and associated tiered screening approach were developed to address environmental protection goals for • Protection of human health(direct-exposure), • Protection against vapor intrusion into buildings, • Protection against leaching and subsequent impacts to groundwater, • Protection of terrestrial biota, • Protection against adverse nuisance conditions The RWQCB provides a framework for a Tier 1 environmental risk assessment that organizes site information to provide a basic "conceptual model" of site conditions That framework is providedhere (in italics) together with site-specific information, either provided directly or via reference to existing documents 1 Summarize Past, Current and Anticipated Future Site Activities and Uses • Describe past and current site uses and activities American Forest Products operated a wood manufacturing plant at the site between 1921 and 1987 A detailed description of former site uses and activities can be found in Section 3 1 of the 2001 Closure Request Report, Former American Forest Products Company, 2801 West Lane, Stockton, California (URS, 2001) Currently the site is inactive and site structures either have been or are in the process of being demolished and salvaged • Describe foreseeable future site uses and activities (Always include a comparison of site data to ESLs for residential/unrestricted land use to evaluate need for formal covenants to the deed, see Section 2 10) For the purposes of this Tier 1 risk assessment, it is assumed that the property will be developed for residential use E 11Profects\URS1AFP12005 DCA InvestigationVIP Investigation ReportlAFP 2005 Report WP-TE-Rev02 doe