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Draft Supplemental Environmental Impact Report Page IV.B-18 Forward Inc. Landfill 2014 Expansion Project storage for 46 trucks per lane, or 92 trucks in two lanes. Forward opens up additional lanes in periods of peak demand, and has opened up to four lanes when necessary. L To estimate the time gap between trucks (time to move one truck off the scales and the next truck on to the scales), Republic recorded large trucks from its own fleet, which required 60 seconds to perform a similar maneuver. The processing time from Forward plus this estimated L time gap equates to a maximum flow rate through a scale of 30 trucks per hour. The peak one-hour entering volume at the Forward site, which occurs during the AM peak, is L 51 vehicles per hour.3 Although some of these vehicles are employee automobiles rather than trucks, the full number was assumed to be trucks for a conservative analysis. With both scales open, this volume can be accommodated within the site queuing area. am Under the proposed project, there would be a maximum of 620 vehicles per day, and the peak traffic flow would be 84 vehicles per hour. Table IV.B-7 shows the estimated queue length calculated for the proposed maximum volume. The hourly volume is subdivided into five- minute increments to facilitate the queue discussion. The five-minute volumes are derived from the Poisson distribution, a statistical distribution that is commonly used for traffic modeling, and which assumes that the input rate will ebb and flow during the course of the peak hour. Thus, some five-minute volumes are below the average input rate and some are above. Table IV.B-7 Maximum Truck Volumes and Queues At Landfill Entrance Existin Volume Queue 1 0 2 0 2 0 3 0 4 0 4 0 5 0 5 0 5 0 6 1 7 2 _ 8 3 52 Maximum Queue 6 iw Maximum Queue 300 feet Length Available Storage 4,680 feet Status of Storage Sufficient L, 3 As discussed in Traffic Volumes,above,the most recent count of AM peak inbound traffic is 44 trips. This is less than the 51 trips used in this queuing analysis,which conservatively overstates queuing impacts. r.