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Page 2 <br /> %.. C <br /> 2.2.4 Closure Testing $6,000 to $ 8,000.00 1 �. <br /> 2.2.5 Possible Re-treat cost $ 2,500.00 ' <br /> Mq Y <br /> � <br /> 2.3 Bucket Auger Removal jRO 1895 <br /> n Cost/Rental $11000.00 <br /> PE M�S RL'c,A4Ty <br /> 2.3.1 Equipment is <br /> 2.3.2 Materials $10,000.00 Total $22,500 <br /> 2.3.3 Geologist/Testing $ 1,500.00 <br /> 3. Bucket Auger Questions <br /> 3.1 Pea gravel Stabilization <br /> There is approximately 15 feet of pea gravel over the soil we wish to <br /> remove. A light cement/sand or cement/flyash mixture will be used to help <br /> stabilize the pea gravel. Casing will be installed during the bucket auger <br /> drilling. Each hole would be treated as a single boring, and cased to a depth <br /> of 15 feet. The casing will control movement of the pea gravel and help <br /> stabilize the excavation. When the soil removal is complete the lower half of <br /> the excavation, (from 15 to 28 feet), will be backfilled with a lean cement/sand <br /> or cement flyash. The upper half of the backfill, (from ground level to 15 <br /> feet) will be completed with pea gravel, (restoring existing 15 feet of pea <br /> gravel). The cement flyash will prevent settling and is soft enough to be <br /> drilled, (should site reentry be required). The existing, (restored) 15 feet of <br /> pea gravel will be capped with concrete. <br /> 3.2 Soil samples <br /> It will be possible to sample each augured hole. Samples could be <br /> drawn from the sides, (at levels where contamination was found in the center <br /> boring, approximately 16 to 19 feet) and bottom, (approximately 27 feet). <br /> These samples will be field tested with an OVM and a representative sample <br /> set from each side of the excavation will be confirmed by laboratory testing. <br /> 3.3 Estimate of Residual Contamination <br /> 3.3.1 General Discussion <br /> Tri Valley Growers intends to remove as much potentially <br /> contaminated soil as is possible. Until excavation begins we can only calculate <br /> a worst case estimate of residual soils beyond reach of the bucket auger. The <br /> following contains a discussion of worst case estimate (3.3.2) and modeling <br /> performed with site specific data secured during excavation, (3.3.3 and 3.4.2). <br /> P.D.Boz 7114, Battery St..,San Francisco, California 94120--7114 Phone:(41.9 40-1600 Telex:27-9046 Fax.•(4L9 404628 <br />