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of refuse placed in the landfill between the dates of the two aerial topographic <br /> maps. Forward's consultants compare the two aerial topographic maps to <br /> estimate the volume of fill (refuse and cover soil) placed during the period <br /> between the two aerials. This volume was divided by the total tons of refuse <br /> placed in the landfill over the same period. This (0.87 tons per cubic yard) is the <br /> lowest in-place density calculated in this manner for Forward Landfill, since 1999. <br /> In addition, it is important to note that this calculation produces a conservative <br /> (i.e., low) in-place density because the volume of fill placed is not reduced to <br /> account for cover soil. The tons of refuse are divided into the total volume of <br /> airspace filled, which includes cover soils. If the volume of cover soils were <br /> subtracted from the volume of fill placed, the calculated in-place density of refuse <br /> would increase (i.e., the same number of tons were placed in fewer cubic yards of <br /> airspace), which would result in a longer estimated site life. The site capacity <br /> calculations reflecting this information are included in Appendix C. <br /> 4.7 SITE LiFE PROJECTION <br /> 4.7.1 SiTE LIFE CALCULATIONS <br /> in order to calculate the site life for the Forward Landfill, the following criteria <br /> was utilized. <br /> • Remaining Site Capacity (with liner, daily, <br /> intermediate and final cover) 30.03 mcy <br /> • Refuse to Cover Ratio 4:1 <br /> • In-Place Density 1,740 lbs/cy <br /> Based on the above criteria and utilizing a inflow rate of 32,506 tons/week with <br /> a 2 percent annual growth rate and a maximum weekly permitted refuse inflow <br /> rate of 46,080 tons/week, the Forward Landfill will have a projected site life of <br /> 11 years (as of January 2006). Based on these calculations (see Table 8), <br /> operations at the Forward Landfill could extend to April 2017. <br /> 4.7.2 FACTORS AFFECTING SITE CAPACITY <br /> Many factors can affect the ultimate site capacity of a given landfill including <br /> variations in waste type, compaction rates, the use of alternative daily covers and <br /> Forward Landfill JTD 4-12 <br /> J:\Allied\Forward\)TD Amendment\january2006 JTD Amendment\JTD Sec 4 012506 Accept.doc: BRYAN A.STiawAT V.ASSOCIATES <br /> 05/24/02;Amendment No.1: 1/27/2006 <br />