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FORMER AMEFJCAN FOREST PRODUCTS Appendix D <br /> Closure Summary Report July 2049 <br /> URS Project 17322736 Page D-2 <br /> 2. Summary of Site Investigation.: <br /> • Identify all types of impacted media. <br /> Soil and groundwater <br /> • Identify all sources of chemical releases. <br /> Waste oil and diesel underground storage tanks <br /> • Identify all chemicals of concern. <br /> "fPHd, 1,2-DCA <br /> • Identify magnitude and extent of impacts that exceed ESLs to extent feasible and applicable <br /> (include maps of site with isoconcentration contours for soil and groundwater). <br /> All chemicals of concern are at concentrations below their respective ESLs for both <br /> residential and industrial use. Table D-1 provides the maximum concentrations of site <br /> constituents in groundwater during the last five quarters in comparison to the respective <br /> ESLs. For groundwater, the ESLs provide conservative Tier I screening intended to address <br /> surface water, indoor-air and nuisance concerns. <br /> • Identify nearby groundwater extraction wells, bodies of surface water and other potentially <br /> sensitive ecological habitats. <br /> See Section 3.2 of this report for an updated water supply well survey. The nearest surface <br /> water body is the Stockton Diverting Canal, approximately 1.25 miles to the north. The site <br /> vicinity is developed for urban residential, commercial, and industrial uses. No potentially <br /> sensitive ecological habitats are known in the vicinity of the site. <br /> • Ensure data are representative of site conditions. <br /> A summary of previous site investigation activities and findings is presented in Section 2.3 of <br /> this report. Hydrogeology is described in Section 3.1. Groundwater conditions are presented <br /> in Section 3.4, and soil conditions in Section 4.0, <br /> 3. Summarize Appropriateness of Use of Tier I Lookup"fables and ESLs (see Section 1.5): <br /> • Do Tier 1 ESLs exist for all chemicals of concern? <br /> Yes. <br /> • Does the site have a high public profile and warrant a fully documented, detailed <br /> em-irorunental risk assessment? <br /> No. <br /> • Do soil and groundwater conditions at the site differ significantly from those assumed in <br /> development of the lookup tables (e.g., low pH at mine sites)? <br /> No. <br /> • Do impacts pose a heightened threat to sensitive ecological habitats (e.g., presence of <br /> endangered or protected species)? <br /> No. <br /> K:Wpr :,s 22?3(`,Ameni Fo, st iosire-Smnmory-R port-Recd1 doc <br />