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<br /> <br />KODIAK ISLAND BOROUGH <br /> <br />Engineering & Facilities <br />710 Mill Bay Road <br />Kodiak, AK 99615 <br />(907) 486-9348 (p) <br />(907) 486-9394 (f) <br /> <br /> <br />MEMORANDUM <br /> <br />DATE: <br />TO: <br />FROM: <br />RE: <br /> <br />February 28, 2005 <br />Bud Cassidy, Director of Engineering and Facilities <br />Tracy L. Mitchell, Environmental Specialist i'1~ <br />Compactor vs. Dozer <br /> <br />A request was made to evaluate whether buying a compactor instead of a dozer would be more <br />economically feasible if the KIB changed its landfill operations from baler to loose fill, Because the <br />operational tasks of each of these pieces of heavy equipment are significantly different it is difficult to <br />compare apples to apples. However, here are some concepts to consider and some compaction information <br />regarding baled and loose fill operations. <br /> <br />In a loose fill operation waste density is determined by thickness of lift being compacted, number of passes <br />the equipment makes, weight and configuration of compaction equipment (plus environmental factors & <br />waste characteristics). An article in Waste Age magazine (April 1998) provides a comparison of waste cell <br />volumes utilizing a baler vs. a loose fill operation. This comparison uses the example of a six inch soil <br />cover on a three-foot lift where loose waste disposal produces a 3.5: 1 waste to soil ratio and therefore only <br />78 percent of the total cell volume is waste. However, four to five waste bales can be stacked in a column <br />with only six inches of soil needed to cover the top bale. Baled waste-to-soil ratio is about 9: 1, which <br />means that 90 percent of the total cell volume is waste. <br /> <br />Those facilities that are loose fill operations typically utilize more than one piece of heavy equipment at <br />their site. Compactors work a minimum a 6-8 hour shift to conduct the primary task of compacting the <br />municipal waste as it is brought to the landfill. Typically, dozers are used as a supplemental piece of <br />equipment when the compactor is down and when waste volumes are up to take some of the stress off of <br />the compactor. Also, according to the Solid Waste Association of North America (SW ANA) compactors <br />are not capable of being used on slopes greater than 7: 1. <br /> <br />The 1GB landfill dozer performs multiple tasks that include: <br />).> Stabilizing and developing slopes <br />).> Compacting the construction/demolition waste <br />).> Pushing up the rock pile used for cover material <br />).> Spreading daily cover material over the municipal waste <br />).> Pushing the metal pile <br />).> Maintaining/building roads and ramps and <br />).> lee removal <br /> <br />An article in Waste Age magazine (August 1998) states that landfills are the most hostile environment a <br />piece of heavy equipment can be put in. If a compactor were the only piece of 1GB landfill equipment to <br />perform the multiple tasks required of the dozer, in addition to municipal solid waste compaction, it would <br />leave a significant amount of other landfill operational tasks undone. This will also overwork the <br />equipment and as such it will show signs of wear earlier and likely require replacement sooner. <br /> <br />Page 1 of2 <br />