Agenda - 11-03-2004-9c - Laserfiche WebLink

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12 Given uncertainties as to actual quantities of landfilled and surface disposed materials and their toxicity, I have used a number of assumptions to calculate quantities and costs for removing those materials. I have listed both the information actually available and the assumptions that I have used in my calculations below. The assumptions are shown in bold typeface. • Aerial photography indicates that the actual total area in which landfill activities occurred (primarily cleared areas) covers approximately 12 acres • Materials were landfilled in discrete trenches rather than in a contiguous cell or cells as per current landfill practice (anecdotal information) • Landfilled trenches were discontinuous (anecdotal information) • The number, location and configuration (alignment, length, width, depth) of trenches is unknown • The entire landfilled area was capped with at least 12" of cover during the Fairview CDBG financed landfill closure project during the early 1980's • Much of the landfill cover (including that in aeeas not directly over landfill trenches) has been contaniinated with rising landfill material (pieces of metal, non-degradable debris, etc,) • Approximately 10% of the landfill area was excavated into trenches • Trenches were excavated to a depth consistent with that accessible to a medium size tractor mounted backhoe (approximately 8' on average) • Much of the material in the trench is mixed with earth material and weighs approximately 1000 pounds per cubic yard • The State will permit the removal of material from Fairview park • The State will not require testing of landfilled material for hazardous chemicals, etc. • The State will not require that material be shipped to a hazardous waste landfill • Additional earth material from trench sides and bottoms will not have to be tested for hazardous chemicals or excavated and disposed of as hazardous materials • The State will permit disposal of the material in a mixed solid waste (MSW) landfill • The Orange County landfill, nearing the end of its useful life, would accept a tremendous volume of material (at an estimated 16,000 cubic yards, equivalent to 10% of total annual landfilled waste) from Fairview Park • Land£II material to be removed and re-landfilled will be classified as MSW • Removed landfill material will be transported to and disposed of in Orange County landfill at current tipping fee for MSW ($42 per ton) Given the facts and assumptions listed above, the Fairview Park cleanup could generate approximately 16,000 cubic yards (including materials lying on the surface) of material weighing approximately 8000 tons to be transported to and re-landfilled at the Orange County landfill.. Approximately 12 acres must be stripped of cover material, that material then screened (to remove landfill contamination) and stockpiled, to expose the landfill trenches. Once the landfill material has been removed, trenches must be backfilled with approximately 50% of backfill material generated by onsite earthmoving and 50% generated by importing (borrow) from offsite. Once the earthwork has been completed, the entire area must be seeded to generate appropriate ground cover, Removal of surface debris from wooded areas will require a great deal of hand work to minimize damage to the existing tree cover.