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Interim Corrective Action Plan Frontier Transportation, Inc. I December 20, 2005 Page 6 from $200,000 00 to 250,000 00 Annual costs to operate and maintain the system are approximately $18,000 00, excluding laboratory analysis fees 4.3) Excavation The area of highest contamination is near MW-3R, where the tanks were originally located This area is bounded to the west by a steel building and to the east by Industrial Way There are several possible options for excavating this area to remove the remaining contaminant source shoring, pile driving, and stepping Both shoring and pile driving increase the excavation costs extensively Stepping the excavation area by cutting five feet down then five feet in will eliminate the need for shoring However, this will also move the area of excavation away from the contaminant source near the building wall Further difficulties lie with groundwater recharge BEII found that water seeped into the excavation pit from the sidewalls and prevented complete excavation I �L� Based upon previous excavations, the volume that will need to be excavated within the 30' x 30' area will total between 1,200 and 1,500 tons Much of the excavated soil will be clean backfill, so the amount of contaminated soil should be less than half of this number For safety and efficiency, shoring would need to be in place Shonng would need to be placed along the eastern wall of excavation pit, near the adjacent building If necessary, shoring would also need to be placed along the western wall of the excavation pit, near the adjacent sidewalk on Industrial Way Additionally, water pumping, storage, and removal would be required during the excavation (as evidenced by the previous excavation) Total Icosts for excavation are estimated at $150,000 00 to $250,000 00 depending upon the extent of excavation and shoring, water pumping and waste disposal costs With these cost and feasibility limitations, excavation is not an effective method to remove contamination at this ' site ' 4.4) Soil Vapor Extraction (SVE) The cost of in situ SVE is site-specific, depending on the size of the site, the nature ' and amount of contamination, and the hydrogeological setting (EPA, July 1989) These factors affect the number of wells, the blower capacity and vacuum level required, and the length of time required to remediate the site A requirement for off-gas treatment adds ' significantly to the cost Water is also frequently extracted during the process and usually requires treatment prior to disposal, further adding to the cost I I