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' GEOMATRIX ' 3.1 REUSE OR DISPOSAL OF EXCAVATED SOIL Soil may be reused at the site pending appropriate approvals since the residual crude 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 ChevronTexaco 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 ChevronTexaco representative will consult with the appropriate party to evaluate the final ' disposition or reuse options and will inform the San Joaquin EHD of the status. This consulta- tion process is not intended to stop excavation work and earthwork may proceed during this evaluation. Because a petroleum hydrocarbon odor and crude oil residue may be present in 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 pave- ment. 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, and ChevronTexaco will handle the disposal of the oil-affected soil (see contact list on last page). Standard industry practice should be used for dust and erosion control of the stockpiled soil. Based on requirements at the time this report was prepared, it is not likely that the San Joaquin ' Valley Air Pollution Control District would require a permit to stockpile this soil; we recom- mend confirmation of this understanding if affected soil will be stockpiled on site. ' If oil-affected soil is disposed of off-site without ChevronTexaco's prior knowledge, ChevronTexaco will not assume responsibility for any cost or liability associated with such disposal. In addition, it is important to consult with the disposal facility regarding potential restrictions for accepting soil affected by petroleum hydrocarbons. 3.2 DEWATERING OPERATIONS It is anticipated that construction activities will require dewatering of the subsurface soil near or in areas that contain affected soil. ChevronTexaco should be contacted before the start of dewatering activities to discuss potential issues regarding this activity. ChevronTexaco will \\0ak1WepWaM\D0c_Safe\6000s\6447.006MCOS SMP.doc 4