ARCHIVED REPORTS_REVISED FEASIBILITY STUDY 2000

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7h3adwe11&Ro110 • Capping of each parcel of OU 2 with asphaltic concrete would cost the following, using the unit costs developed for OU 1: Area 15 —$360,000 Area 16—$360,000 Area 21 —$180,000 The costs associated with remedial action planning, management, and reporting, which would likely be required by DTSC at Areas 15, 16, and 21, include preparing a Remedial Action Work Plan and Health and Safety Plan prior to implementing the work, a Soil Management Plan for use during and after development, and a Remedial Action Completion Report documenting the remedial action. We estimate that the costs for these items, would be approximately $18,000 for each site. This estimate does not include charges that may be imposed by regulatory agencies for oversight. • The cost for consultant oversight during the excavation, grading, and capping process, is approximately $8,200 at Area 15, $8,200 at Area 16, and $5,500 at Area 21. Of the three parcels which make up OU 2, only Area 21 had a soil contaminant concentration that exceeded calculated acceptable risk levels. Copper was found at Boring 2113-2 at 1.0 feet below grade, at 3,600 mg/kg. Using the costs and rational presented in 4.2.9.1,the estimated cost to excavate five cubic yards of soil and dispose off-site as Non-RCRA Hazardous waste is $608 to $690 plus a$400 premium for soil profiling and transportation due to the small soil volume. Two treatment technologies passed the initial screening evaluation and are applicable for fuel and halogenated organic compound soil remediation. Vacuum extraction (soil vapor extraction) is currently being performed at Area 16 for the remediation of petroleum hydrocarbons in soil. Initiated in November 1999,the cost to date for a system comprised of a catalytic oxydation unit, • blower and sparger, 24 sparge wells, 15 vertical vacuum extraction wells, and 10 horizontal 31 25970318.PGS 15 November 2000