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0 • GEOMATRIX dust). Ingestion of produce from plants grown at the Site was also evaluated as an exposure pathway for on-site residents. ' Exposure assumptions and methodologies that are consistent with guidelines published by the California Environmental Protection Agency were used to calculate refined soil screening levels for the COPCs that are believed to be protective of human health, including sensitive populations. A comparison of refined soil screening levels to the concentrations of COPCs in both the non-residential and residential areas of the Site indicated that exposure to petroleum hydrocarbons present in Site soil should not result in unacceptable health risks. The DTSC reviewed the site-generated data and concurred that residual petroleum hydrocarbons in soil are below concentrations that would constitute an unacceptable risk to human health or the environment. A copy of the letter dated August 13, 1997 from the DTSC for the Alden Park ' area is attached as Appendix A to this document. 3.0 SOIL MANAGEMENT PLAN ' This soil management plan is intended to describe options for handling the soil affected by ' degraded Bunker C fuel oil if it is excavated during construction or when placing/repairing belowgrade utilities. The degraded Bunker C fuel oil is primarily present underneath the park area. ' 3.1 REUSE OR DISPOSAL OF EXCAVATED SOIL Soil can be reused at the Site because the residual Bunker C oil in soil does not pose an unacceptable risk to human health or the environment. Upon encountering oil-affected soil ' during excavation, the following steps should be taken: (1)notify Chevron and(2) visually identify, segregate, and stockpile the excavated oil-affected soil on site. Upon notification that ' degraded oil-affected soil has been encountered, a Chevron representative will consult with the appropriate party to evaluate the final disposition or reuse options and will inform PHS-EHD of the status. This consultation process is not intended to stop excavation work; earthwork may tproceed during this evaluation. Because a petroleum hydrocarbon odor may be associated with this soil, consideration should be given to where the soil is placed. Potential reuse options include placing the soil back into the subsurface (in trenches and other excavations) or underneath surface coverings (roads,parking areas, or other paved structures). The following guidelines are recommended: (1)if used as trench backfill, the oil-affected soil should not be placed in contact with underground utilities or areas that might require future excavation; (2)the soil should not be placed shallower than 2 feet bgs unless covered by ' I:\Doc_Sare\c000swiis.oaovsnP.d« 3