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

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11 MEMORANDUM TO: County Commissioners .John Link, County Manager COPIES: Gwen Harvey, Asst. County Manager Rod Visser, Asst. County Manager Dave Stancil, ERCD Director Lori Taft, Recreation and Parks Director Pam Jones, Purchasing and Central Services Director FROM: Paul Thames, PE, County Engineer DATE: September 30, 2004 SUBJECT: Cost/feasibility of restoring (removing landfilled material) Fairview Park As per the request of the BOCC, this report outlining my opinion/estimate as to the feasibility/cost to clean up/restore (remove landfill material and dress area) the portion of Fairview Park impacted by historic landfilling activities is provided for the Board's review. The information contained herein was originally generated in response to a request of the Fairview Park Steering Committee and was presented to the committee by way of verbal report in Apri12004. The cleanup cost estimate, with caveats, is as follows. The primary caveat is that there is no accurate accounting as to the quantity or the specific nature (toxicity, etc.) of the material that was landfilled.. For example, in its .Tiny 2002 geotechnical and Phase II site assessment reports (excerpt copies attached), Trigon Engineering Consultants, Inc., estimated that the landfilled area contains between 100,000 and 200,000 cubic yards of waste. My own estimate -based on consideration of anecdotal information indicating that landfilling practices consisted of burying waste in discontinuous/non-contiguous trenches excavated with atractor-type backhoe rather than in contiguous cells (current high-efficiency landfilling practice) - is that the landfilled area contains approximately 16,000 cubic yards of waste. A second caveat is that it is very difficult to quantify, in units that can be used to estimate removal/cleanup costs, the amount of waste material dispersed in the landfill cover/cap (a tluee foot fill cap was to be placed on the landfill as a landfill closure process during the Fairview CDBG of the early 1980's) and on the surface of the wooded periphery of the landfill area The Trigon geotechnical report noted the presence of a fill cap in 90% of the soil borings in the landfill area with fill depths varying in thickness from less than one foot to six feet or more. Approximately one-third of the borings contained landfill related trash and debris. An additional ten acres (approximately) of the wooded areas peripheral to the landfilled area contain surface trash and debris.