SITE INFORMATION AND CORRESPONDENCE

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California Environmental Protection Agency Department of Toxic Substances Control OU1 is comprised of Areas 10, 11, and 20. Areas 10 and 11 were used as shipbuilding and steel fabrication and storage facilities from the mid-1940s to the 1970s. Although there are no buildings currently, half the site is covered with reinforced concrete slab foundation from previous warehouses. Remnants of a rail spur are also present. Area 20 is a vacant lot previously used as a switching yard for Western Pacific Railroad. OU2 includes Areas 15, 16, and 21. Areas 15 and 16, originally developed in the early 1900s, were redeveloped in the1950s for auto sales, repair, and storage facility doing business as Chase Chevrolet. Area 21 is a distribution facility for the Crystal Creamery and is still active. Underground fuel storage tanks are being investigated and remediated under the jurisdiction of the San Joaquin County Environmental Health Division (SJCEHD) and therefore are addressed separately from this project. The Site is generally flat with no surface water features or wetlands within the area. Structures previously existing on Areas 10, 11, and 20 have been removed and single story metal, wood frame, and brick structures are present at Areas 15, 16, and 21. The Stockton Ship Channel abuts Areas 10 and 11. This Site is located in the City of Stockton's Downtown Redevelopment Zone with development plans for commercial and/or recreational use. Once a specific project is identified, the City of Stockton will need to prepare the necessary environmental reports in compliance with CEQA requirements, which will reference the RAP. Land use restrictions will not hamper redevelopment plans since restricted site activities will only include prohibitions on construction of residences, hospitals, daycare centers, and schools for persons under 21 years of age. The City of Stockton Housing and Redevelopment Agency (City) entered into the Voluntary Cleanup Program with DTSC in 2000 and has completed a Remedial Investigation/Feasibility Study, Health Risk Assessment and draft Remedial Action Plan. The Remedial Investigation and Risk Assessment were conducted to determine the type and extent of contamination and the potential risk posed by the identified chemicals of concern. Extensive soil sampling was completed which consisted of approximately 200 sample locations. Over 25 temporary and permanent monitoring wells have been installed (some wells were installed in conjunction with the underground storage tanks investigation) to determine the quality of groundwater and the effects the contamination has had on groundwater. Soil and groundwater samples were analyzed for petroleum hydrocarbons, heavy metals, volatiles, semi-volatiles, and polynuclear aromatic hydrocarbons. Based on the results of the investigation, it was determined that soils were impacted by the COCs at various locations to generally a depth of three feet, but ranged as deep as 10 feet. Groundwater was minimally impacted and was determined not to require any remedial action. The soil excavation will be determined complete when the established remedial action objectives are met, which include: lead at 750 milligrams per kilogram (mg/kg), arsenic 20 mg/kg, total TPH as diesel at 100 mg/kg, TPH as motor oil at 1,000 mg/kg and PAHs (seven compounds identified and range from 0.2 mg/kg for benzo(a)pyrene to 0.5 mg/kg for chrysene). Parcels impacted by the UST releases will continue to be regulated by the SJCEHD under separate authority than efforts described in the North Shore draft Remedial Action Plan. 2