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1 <br /> Aeration will employ a tractor pulling discs or other soil turning implements at a frequency <br /> ' of 8-10 times per month Spread soil will be treated in layers not exceeding 0 5 FT to <br /> allow oxygen and moisture to reach contaminated soil Anticipated remediation costs of <br /> ' $40/TN were derived from earlier experience but may be less, dependent upon quantity <br /> to be remediated The anticipated remediation cost per ton will be reevaluated in light of <br /> ' changed quantities An area 15rF7ng x 75 FT wide with a side slope of 1 1 and 15 <br /> FT deep could include betweenY d'ependent upon extent of contaminated soil to <br /> be excavated from the side walls <br /> 323 Thermal Hydrocarbon Separation was considered Availability of equipment is <br /> limited Additionally, thermal separation of the diesel and asphalt fractions of the <br /> contaminant may present air quality issues Transportation costs and the need to <br /> replace the excavated material were a factor <br /> 324 Burial as a low grade waste in a Class II or Class III land fill has been considered <br /> and may be a feasible alternative based upon the anticipated tonnages to be excavated <br /> ' at the Acampo Plant well sites Class III material may be disposed of at the Forward <br /> Landfill near Manteca atm ITN or about $30/CY FOB Forward Landfill Transportation <br /> costs are approximately $721 HR for a truck capable of hauling 24 tons of excavated <br /> material or about $4 per TN or about $6 per CY Replenishment material cost FOB the <br /> ' tobsite from Lockford, CA would be about $6/TN or say $9/CY These prices do not <br /> reflect excavation, loading or spreading and compacting costs at the site <br /> .3 Characterize the Shallow Groundwater <br /> 3 G ound ater <br /> ' Water quality will continue to be sampled at the existing monitoring wells <br /> quarterly through the end of 2004 to assure that the contamination zone has not spread <br /> ' 3-4 <br />