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Air-Sparging Assumptions (plume cut-off without soil vapor extraction) <br /> ► Plume cut-off can be achieved with wells spaced 10 feet on center. <br /> • Homogenous vertical soil profile along well line allows complete air coverage In treatment zone without <br /> channeling. <br /> ► Aquifer is deep enough and/or regulatory requirements are loose enough that volatilization to the <br /> atmosphere or receptors is not a problem. <br /> ► Receptor hazards (such as building basements)that would require specialized monitoring/Warning <br /> installations are not present. <br /> ► Secure site, no unusual expenses. <br /> Includes $10,000 allowance for basic infrastructure installation. <br /> Installation Costs <br /> First Year Subsequent <br /> Years <br /> "In and Out"of site (driller) $4,000 <br /> Drilling labor and materials 10,000 <br /> Equipment cost 10,000 <br /> Infrastructure cost, installation and equipment 30,000 <br /> installation <br /> Total $54,000 $0 <br /> Annual Operating Costs <br /> First Year Subsequent <br /> Years <br /> Utilities $2,000 $2,000 <br /> Maintenance, operations and specialized operations 18,000 18,000 <br /> monitoring <br /> Total Annual Operating Cost 20,000 20,000 <br /> Total Costs $74,000 $20,000 <br /> C-7 <br />