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Treadwell&Rollo <br /> • <br /> to operate. This recommendation may be revised should system performance evaluations be <br /> available. Estimated operation and maintenance costs are $4,000 per month, including <br /> equipment lease expenses and system operations and maintenance. <br /> Area 21 <br /> According to SJCEHD, a soil vapor extraction pilot test has been performed at Area 21 to <br /> determine the viability of using SVE to remediate soil and groundwater contamination. The test <br /> reportedly indicated that soil conditions were appropriate for SVE. No costs to construct and <br /> operate an SVE have been presented by the current owner. Based on our experience in similar <br /> conditions, we estimate that an eight-well SVE system with four air sparging wells could be <br /> installed and operated for 18 months for approximately $200,000. <br /> A Remedial Action Plan(RAP) is in preparation and is expected to be submitted to DTSC in <br /> • November 2000. <br /> • <br /> 42 <br /> 25970318.PGS 15 November 2000 <br />