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• Converting to either a compressed natural gas (CNG) or <br />Review of Trash <br />liquefied natural gas (LNG) engine; and <br />Collection <br />• Using "operate -at- idle" technology ". <br />Impacts <br />In addition to the above options, a well built, tight fitting, well <br />maintained vehicle can also help reduce noise. <br />A study in the Netherlands found there were noise reductions with <br />natural gas vehicles of 90% inside the truck, 98% beside the truck <br />and 50% behind the truck compared to diesel powered vehicles.18 <br />As mentioned above, a major impediment to the use of natural <br />gas trash trucks in Fort Collins is the lack of required fueling <br />infrastructure. <br />As discussed previously, in addition to fuel savings operate -at -idle <br />technology also significantly reduces engine noise. Most of the <br />loud engine noise associated with garbage trucks comes from <br />revving the engine to pack the load. With an operate -at -idle trash <br />truck there is a separate hydraulic system on the truck body. This <br />separate hydraulic system provides the pressure needed to pack <br />the load without revving the engine and generating the associated <br />engine noise. <br />Backing Alarms (Beepers) <br />Vehicle backing and noise associated with vehicle backing alarms <br />are most often associated with commercial collection activities. <br />Placing limits on commercial collection activities near residential <br />neighborhoods can help address related noise issues. "Smart" <br />back -up alarms can also be used. These alarms sense the level of <br />ambient noise and adjust accordingly. In quiet conditions the <br />alarm beeps at a much quieter level. <br />Noise at Point of Collection <br />Noise at the point of collection (i.e., emptying containers) can be <br />reduced by taking various actions to reduce engine noise, as <br />discussed above. In addition, efforts to reduce noise associated <br />with the dumping of materials, particularly glass recovered through <br />the curbside program can also be taken. These include <br />commingling of glass with other recyclable materials, reducing <br />dump heights and potentially eliminating glass from the curbside <br />program. <br />Overall noise associated with residential collection operations at <br />the point of collection would not be reduced under a districted <br />collection system since it does not reduce the number of pickups, <br />" With non operate -at -idle vehicles the engines need to rev when the <br />body is packing. With an operate at idle vehicle there is an hydraulic <br />system on the body which is capable of providing the hydraulic pressures <br />need to pack without revving the engine, which creates noise. <br />18 Ahhhh ... the Peaceful Sounds of Garbage Trucks, N. Stiles; MSW <br />Management May /June 2007. <br />Section 2 - 15 <br />