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y Proposal and Estimated Budget No. MDT Stockton, CA Proposal No. P15501.00 Page 3 followed, field data collected, laboratory and field data analytical results, conclusions and recommendations. Task 4. iI ration gnd C nfermation Soil Pile Sampling If the volatile organic compounds (VOCs) of the soil register less than 50 ppm based on stockpile sampling, the soil will be aerated under exemption from the San Joaquin Valley Unified Air Pollution Control District (APCD) and subsequently used as backfill. Should the VOC content of the soil register greater than 50 ppm, the impacted soil will be aerated under permit from the APCD, or transported off site to an appropriate landfill. The cleanup goal for soils to be used as backfill is non-detectable (ND) concentrations of hydrocarbons. It is anticipated that this level can be reached with minimal manipulation of the soil pile. Our estimated costs include labor for monitoring "hot spots" in the soil pile on two separate occasions. If additional soil pile manipula 'on is required, additional costs would be incurred. If soils are successfully aerated on site, confirmati n soil pile sampling and analysis will be conducted by RESNA prior to backfilling activities. One soil sample for every 25 cubic yards of remediated soil is required by PHS/EHD (June 8, 1993 correspondence) for soils to be used as backfill. A total of 40 samples will be collected and analyzed for BTEX, TPHG and TPHD by a State-certified laboratory. Every effort will be nade to negotiate with PHS/EHD to obtain a reduction in the number of confirmation soil samples required. 'ask 5. Backfilling Upon confirmation of successful remediation, stoccpiled soils will be placed into the open excavation and compacted to prevent future settling c of soils. It is our understanding that a City of Stockton grading permit will be required prior to 3ackfilling activities, and 90% compaction of fill material is necessary. It is anticipated that ap ropriate compaction can be attained using excavating equipment. Up to 300 cubic yards of clean make-up fill material will be imported as necessary to compliment remediated soil. Backfiling activities do not include restoration of asphalt surfaces. This service can be provided at an additional cost, if requested. The estimated cost for the proposed work summariz in Exhibit A attached. Any additional work performed that is not described in the proposal or estimated cost will be treated as a separate phase of work and may require a separate proposal and estimated budget. P5at.FNL