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No Further Action Request Section 5 0 <br /> Former American Forest Products Facility� • 2/16/2006 <br /> URS Project No 17322736 Page 5-2 <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 /> TPH-D, 1,2-DCA <br /> • Identify magnitude and extent of impacts that exceed ESLs to extent feasible and applicable <br /> (include maps ofsite with isoconcentration contours for soil and groundwater) <br /> All chemicals of concern are at concentrations below their respective ESLs Table 4 provides <br /> the maximum concentrations of site constituents in groundwater during the last four quarters <br /> in comparison to the respective ESLs For groundwater, the ESLs provide conservative Tier 1 <br /> screening intended to address 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 4 of this report for the most recent water supply well survey information The <br /> nearest surface water body is the Stockton Diverting Canal, approximately 1 25 miles to the <br /> north The site vicinity is developed for urban residential, commercial, and industrial uses No <br /> potentially sensitive ecological habitats are known to exist in the vicinity of the site <br /> Ensure data are representative ofsite conditions <br /> A summary of previous site investigation activities and findings is contained in the 2001 <br /> Closure Request Report, Former American Forest Products Company, 2801 West Lane, <br /> Stockton, California (URS, 2001) Updated lithologie cross sections based on two additional <br /> groundwater monitoring well installations, together with 1,2-DCA isoconcentration maps, are <br /> provided in Additional 1,2-DCA Investigation and Site Conceptual Model and Second <br /> Quarter 2004 Groundwater Monitoring Report, Former American Forest Products Facility, <br /> 2801 West Lane, Stockton, California (URS, 2005a) <br /> 3 Summarize Appropriateness of Use of Tier I Lookup Tables and ESLs (see Section 1 5) <br /> • Do Tier I 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 /> environmental risk assessment <br /> No <br /> • Do soil and groundwater conditions at the site differ significantly from those assumed an <br /> development of the lookup tables (e g, low pH at mine sites) <br /> E 1+Projects\URS1AM2005 DCA InNestigationViP Investigation Report\AFP 2005 Report WP-TE-Rcv02 doe <br />