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N-001, r.,,/ GEOMATRIX 3.1 REUSE OF EXCAVATED SOIL Soil can be reused at the site because the residual crude oil/Bunker C oil in soil does not pose `r an unacceptable risk to human health or the environment. Upon encountering oil-affected soil during excavation, the following steps should be taken: (1)notify CEMC 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 CEMC representative will visit the site to measure soil vapor concentrations of the stockpiled soil, consult with the appropriate party to evaluate the final reuse or disposition options, and inform PHS-EHD of the status. This ,r consultation process is not intended to stop excavation work and earthwork may continue during this evaluation period. 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). t.. 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 >r excavation; (2) the soil should not be placed shallower than 2 feet bgs unless covered by pavement. If it cannot be reused in the subsurface or underneath surface coverings, the oil- affected soil should be stockpiled separately from non-affected soil excavated at the site. If the landowner chooses to dispose of oil-affected soil off-site, the oil-affected soil must be disposed of at a Chevron-approved landfill. Standard industry practice should be used for dust and erosion control of the stockpiled soil. Based on our experience at similar sites, the San Joaquin Valley Unified Air Pollution Control District(the District) should not require a permit to �., stockpile this soil. However, a CEMC representative will measure soil vapor concentrations from the stockpiled soil to confirm that the vapor concentration does not exceed the District's permitting threshold levels. 3.2 HEALTH AND SAFETY ISSUES Based on the results of the PEA evaluation described above, the presence of residual petroleum constituents detected in the soil and groundwater at the two sites does not pose an unacceptable risk to human health or the environment, under the conditions evaluated. Construction workers or others who encounter and handle oil-affected soil do not require any specific health and safety training above standard requirements for performing their job. The oil-affected soil may have a petroleum odor that dissipates over time, and the odor may cause temporary side effects (such as nausea,headache, etc.). If workers voluntarily choose to use air purifying respirators rather than dust masks to avoid these nuisance odors, workers must be trained, and fit-tested, bow \\sf3\deptdata\Doc Safe\6000s\6115.014\SMP.doc 4 Ir