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Review of Trash As shown, residential trash trucks have an estimated impact Collection equivalent to approximately 1,300 passenger cars. This is comparable to the findings of other studies that we have Impacts conducted as well as that reported by various independent third parties (Appendix C). The impact of recycling trucks is much less but still significant, and roughly equivalent to the impact of local delivery trucksZ'. One point to note is that the impact of large delivery trucks (3 or more axles) is approximately two- thirds that of local delivery trucks (2 -axle / 6 Tire Trucks) based on the sample population. This tends to support the positive benefit additional axles can have on lowering overall vehicle impacts. In reviewing this comparison it is important to note that the impacts shown are based on a random sampling of vehicles. There can be wide variability of impacts within the general vehicle types noted. As an example a larger local delivery truck hauling construction materials, heavy furniture or food supplies may have a significantly greater impact than a smaller local delivery truck hauling overnight packages. Impact of Overloaded Vehicles Background / Overview The impact that a vehicle exerts on a section of pavement is related to the vehicle's axle weights. As axle weight increases the impact increases at a rate much greater than proportionally. As such, overweight vehicles exert a significantly greater pavement maintenance impact than that same vehicle at or below its legal weight, in addition to presenting a potential safety hazard. Analysis A trash truck operating at one (1) ton over a legal payload of 10 tons (10% overweight) exerts an impact approximately 50% more than a vehicle loaded to its legal weight. That same vehicle operating at two (2) tons (20% overweight) over its legal payload exerts an impact approximately 100% higher than when loaded to its legal weight ". The fact that the Larimer County Landfill, and certain other neighboring landfills, do not have scales and charge haulers based on volume presents a potential incentive for haulers to maximize vehicle payloads. This may foster the overloading of vehicles. While this potential may exist, it does not necessarily 23 Our projection of recycling truck impacts is based on the smaller non- compacting vehicles that two of the haulers are currently using. It is certainly conceivable that larger compacting vehicles could be used for collection of single stream recyclables in the future with a much larger associated impact. 24 Source: AASHTO Guide for Design of Pavement Structures. Section 2 - 21