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October 2000 -42- 003-2191 Leachate = P - R Where P =precipitation and R =Run-off and evaporation The precipitation event chosen for this equation will be the average precipitation for the yeaz is 19 inches. Because the annual precipitation is uniformly distributed during warm months, it will be assumed that one-fourth of the precipitation will percolate down through the depository and three-fourths will run-off or evaporate. History has demonstrated that the landfills in Colorado do not produce or produce extremely limited leachate. This site is not expected to produce leachate. However, for the purposes of design of a leachate system, it is assumed that the active portion of the depository will not encompass more than 20 acres. If 4.25 (19=4) inches of water infiltrated the 20.0 acre depository during the yeaz, then the leachate produced would be 0.59 cubic feet per minute or 4.4 gallons per minute. This calculation would be making the assumption that none of the water was held within the fill material. Therefore the maximum design of the flow system for leachate control will be 5 gallons per minute. Should leachate be produced, it will be recirculated over the site or trucked to a approved liquid waste system. The chemical and physical chazacteristics of the leachate aze unknown. The estimated waste compositionbased on other Constructionand Debris facilities is as follows: Waste Composition Percentages Wood Paper/Paper Products Yard Waste Plastics, Glass, Metals Rubber, Tires, Insulation, etc Concrete, Dirt, Asphalt Sheetrock, White Goods 25 8 16 II 10 43 ]0 Any potential seepage water that would come into contact with the waste listed above • would not be degraded to any significant degree, neither is it projected that such water uooaiviiz~9isea,i~.ae„~,~iiooo e« Sedalia Recycling Center and Depository