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'` KLE//VFEL®ER <br /> \� Bright People.Right Solutlonn <br /> "4r <br /> a residential receptor). A similar methodology using the burden mode of EMFAC2007 <br /> gY 9 <br /> was performed to obtain an average idle emission rate. The following average emission <br /> rates were calculated: <br /> Running Emission Rate <br /> On Facility (5 miles per hour [mph]): 0.223 grams per mile <br /> Off Facility (15 mph) 0.130 grams per mile <br /> Idle Emission Rate <br /> 1 On Facility (idling) 0.00000476 pounds per minute per vehicle <br /> Emission Calculations and Modeling <br /> The emissions from the proposed project were calculated using the annual mileage or <br /> hours of operation and the emission rate. When input into AERMOD, the annual <br /> emissions were converted to grams per second to produce a modeled rate that assumes <br /> the annual emissions were spread out evenly over the entire year. The modeled rate was <br /> finally divided evenly over the source nodes used in the model. The following emissions <br /> and modeled rates were calculated: <br /> Table 1 <br /> Proposed Diesel Emissions <br /> Annual Modeled <br /> Description (pounds/year) (grams/second) <br /> Proposed On-Facility Emissions 14.859 2.137E-04 <br /> Proposed Off-Facility Mileage 12.188 1.753E-04 <br /> Proposed Idle Time 3.953 5.685E-05 <br /> All idling was assumed to occur on site during queuing for the scale and unloading <br /> activities. Based on the information provided in PWCG 2011, on-site idling occurs <br /> queuing for the scales 22.6 % of the time and during truck unloading/loading 77.4% of the <br /> time. <br /> 121339/IRV11Rxxx Page 3 of 7 September 15, 2011 <br /> Copyright 2011 Kleinfelder <br />