SITE INFORMATION AND CORRESPONDENCE

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California Environmental Protection Agency Department of Toxic Substances Control ---------------------------------------------------------------------------------------------------------------------------------- 9. Transportation/Circulation (Workbook; page 29) ---------------------------------------------------------------------------------------------------------------------------------- Description of Environmental Setting: The Project proposes to remove approximately a total of 415 cubic yards/562.5 tons of soil contaminated with lead, arsenic, polycyclic aromatic hydrocarbons, and petroleum hydrocarbons. Specific excavation areas were selected based on the identification of soil that contained CDCs at concentrations exceeding the RAOs. Predicted excavation volumes were calculated by assuming the excavation area were typically six feet square and one foot deeper than the depth of the sample containing the COC. The excavated areas will be tested to confirm that the RDAs were met before backfilling to grade. The backfill operation will use clean soil from either onsite, if available, or from a nearby offsite location and compacted to 85 to 90 percent relative compaction. Contaminated soil removed from the Site will be transported to an approved landfill as specified in the Soil Management Plan/Transportation Plan that needs to be prepared for DTSCs approval prior to the implementation of the remedial action. Unless otherwise specified in that plan, arrangements will be to excavate the soil and dump it into prepared 40 cubic yards containers and transported to a facility such as Forward Landfill, located in the Central Valley. It is expected that 10 to 15 containers will be necessary and the loading and transportation is expected to take one to two weeks. However, if the operation corresponds with the development activities, the contaminated soils may be staged in a designated area thereby extending the duration of the schedule to accommodate the development schedule. It is anticipated that the transportation route will take the trucks via city streets (most likely Freemont Street) to Highway 5 and then to the appropriate disposal facility. The trucks will not transport through residential neighborhoods and the frequency of the trucks will be insignificant to impact the flow of traffic. Ref: Insite Environmental: Administrative Draft, Draft Supplemental Environmental Impact Report for the Mudville 9 Ballpark, Downtown Stockton, California, November 8, 1999 Analysis of Potential Impacts: The removal of contaminated soils will not likely result in a measurable increase in vehicular traffic. The trucks and heavy equipment that will be involved in the grading, excavation and soil transportation will be parked onsite during the duration of the remedial action activities at the Site and will occur when the site is being prepared for development. A separate EIR will be prepared by the City of Stockton and will address the effects of transportation associated with the development Project. This project will not create any adverse effects on circulation or movement of people and/or goods, or increase hazards to motor vehicles, bicyclists, or pedestrians. Ref: Insite Environmental: Administrative Draft, Draft Supplemental Environmental Impact Report for the Mudville 9 Ballpark, Downtown Stockton, California, November 8, 1999 Treadwell & Rollo, Second Addendum to the Revised Feasibility Study, North Shore Parcels, Stockton, California, 25 May 2001 14