Once emission factors are determined , the equipment size (in horsepower) is assigned to each  construction equipment type based on site-specific information or based on the most freq uently  utilized equipment within the country in which the  project is located as derived from  NONROAD2008a.  Emission factors and horsepower for each equipment type are then applied to  the anticipated equipment work output ( i.e., horsepower-hours of expected equipment use).  Lastly the usage factor and load factor are applied.  Table A6-1  ( Example of Construction  Equipment Data ) presents example construction equipment data such as horsepower, load factor,  and usage factor.  A usage factor accounts for the percentage of daily operation and a load factor accounting for the  average throttle setting relative to full throttle rating is used and based on data within NONROAD model. For example, a usage factor of 0.75 equates to 7.5 hours of operation (based  on a ten hour work day) and a load factor of 0.62 equates to 62 percent of full throttle rating  during operation.  Table A6-1. Example of Construction Equipment Data  Equipment  Horsepower  Load Factor  Usage Factor  Backhoes  100  0.21  0.55  Small Compressors (185 cfm)  40  0.43  0.39  Medium Compressors (300 cfm)  75  0.43  0.39  Large Compressors (1,600 cfm)  100  0.43  0.39  Small Generators  40  0.43  0.16  Medium Generators  175  0.43  0.16  Large Generators  300  0.43  0.16  Crane (45-ton)  175  0.43  0.48  Crane (100-ton)  300  0.43  0.48  Tugboat  600  0.21  0.02  Light Towers  25  0.43  0.26  Excavators  175  0.59  0.53  Dozers  175  0.59  0.45  Graders  300  0.59  0.46  Pavers  175  0.59  0.39  Rollers  100  0.59  0.37  Sweepers  175  0.43  0.59  Mobile Mixers  6  0.43  0.13  Milling Machines  75  0.43  0.46  48$_{ }$ APPENDIX A6$_{ }$