2024.05.06 CC Packet - Laserfiche WebLink

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Decommissioning Assumptions To develop a cost estimate for the decommissioning of the Project,the following assumptions and pricing references were utilized.Costs were estimated based on current pricing, technology,and regulatory requirements.The assumptions are listed in order from top to bottom of the estimate spreadsheet. 1.The projected life of the Project is 25-35 years. 2.Decommissioning will utilize a full-time Project Manager or support staff. 3.Common labor will be used for most of the tasks except for heavy equipment operation. 4.Mobilization was estimated at approximately 7%of the total cost of other items. 5.Permit applications required include the preparation of a Storm Water Pollution Protection Plan (SWPPP)and a Spill Prevention Control and Countermeasure (SPCC)Plan. 6.Road gravel removal was estimated on a time and material basis using a 16-foot width and an 8-inch thickness for the access roads.Because the material will not remain on-site,a hauling cost is added to the removal cost.Road aggregate can often be disposed of by giving to landowners for use on driveways and parking areas.Many landfills will accept clean aggregate for use as "daily cover"and do not charge for the disposal. 7.Grade Road Corridor reflects the cost of mobilizing and operating light equipment to spread and smooth the topsoil stockpiled on-site to replace the aggregate removed from the road. 8.Erosion and sediment control along roads reflect the cost of silt fence on the downhill side of the roads and surrounding all on-site wetlands. 9.In most cases,topsoil is required to be stockpiled on the Project site during construction, therefore any such stockpiled topsoil can be used to replace the road aggregate,once removed.This will help in eliminating the costs for any borrowed landfill.Tilling to an agriculture-ready condition is estimated at $402.87 per acre (based on DOT bid prices for Soil Bed Preparation).The majority of the Project area is assumed to be tilled to an agriculture-ready condition.Because decommissioning activities are not expected to eliminate the grasses and vegetation under the arrays or heavily compact the soils the restoration effort is expected to be limited.Array areas left as pasture will require little restoration effort because the arrays will have been planted with native plants and pollinator seed mixes.As a result,the soils will have been rejuvenated by having been removed from intensive farming. 10.Fence removal includes loading,hauling,and recycling or disposal.The fence and posts weigh approximately 10 pounds per foot.