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J contaminated soil stockpiling cost at a basic volume of 500 cubic yards of material to be stockpiled and then a per yard cost for any additional material to be handled and stockpiled. i Task 4: Excavation Backfill i The excavation backfill operations can proceed once permission has been received from PHSEHD. Backfill operations will be under tie direction of Raney Geotechnical Inc. (Raney). Native fill will be obtained by the contractor from the field on the Hi Hopes property located immediately south of the xcavation. Native soil will have all large wood and brush removed prior to transport into the excavation. The soil will be placed in the excavation in lifts approximately 6 ir rhes thick and compacted to 95% of field density oras directed by the Raney soils engineer. It is anticipated that the portion of the excavation hat extends from 20 feet to 35 feet below ground surface will be backfilled and compacted with a portable or remote controlled compactor so that no personnel will be at the base of the excavation. Once backfill has been placed to within 5 feet of the floor of the main excavation wheeled compactor equipment can be used to attain the 9.5% or as directed maximum field density. It is anticipated that the contractor will need to provide all necessary water from a water truck. No water will be available on site. Water may be obtained from the City of Lodi or from San Joaquin County Department of Public Works. Contractor will bid the backfill operations on a tim a and materials basis using the following equipment: (1) excavator; (2) front end I ader, (3) water truck, and (4) compactor. Bid will be based on equipment hourly or daily cost and on standby cost. Contractor must understand that compaction may require more additional effort than is anticipated but that the Raney soil engineer will have final authority on the completion of grading and compaction. 3