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4. ENVIRONMENTAL ANALYSIS 4.4 TRANSPORTATION AND CIRCULATION — 4.0 million tons of material, over a 60-year period. Material will typically be hauled in 25-ton- capacity trucks that will arrive at the site empty and leave the site full of material. The trucks would return to the site empty via the same route after delivery of the material. Daily and AM peak-hour project traffic volumes were determined based on the maximum amount of material — expected to be generated by the project(4.0 mty)and the capacity of the trucks hauling the material (25 tons) over a 8-hour per day, 260 day work year. The calculation includes an assumed seasonal adjustment factor of 1.6 based on numerous interviews with plant managers — regarding their production peaks. This adjustment is applied to convert the average annual daily and peak-hour project traffic volumes to the corresponding volumes that would be expected during summer months,when production reaches seasonal peaks. Table 4.4-4 presents daily and peak-hour project traffic volumes expected during peak summer months. Employee trips to and from the site were not evaluated in this analysis because it is assumed that these trips would occur prior to the AM peak hour. TABLE 4A 4 PROJECT TRIP GENERATION — Annual Average Peak Seasonal Average Annual Production(tons) 4,000,000 4,000,000 Truck Loads(25 tons/truck) 160,000 160,000 — Daily Truck Loads(260 days/year) 613 981 Total Trips(Inbound+Outbound) 1,226 1,962 Hourly Average Truck Loads(8 hours/day) 77 123 Peak-Hour Truck Loads(1.25 x average) 96 153 Total Peak-Hour Trips(UB+OB) 192 306 The traffic volumes expected to be generated by the approved mining site not yet in operation on Bird Road south of Blewett Road are shown in Figures 11 and 12 contained in Appendix C. These approved-project traffic volumes were estimated based on a review of the Environmental Impact Reports for Brown Sand and Gravel(final report dated July 1997, State Clearing House _ Number 960-42075). 7Wp Distribution — As previously mentioned,two possible haul routes were considered as part of the analysis. Each of these routes,along with the associated distribution of trips are described below and shown on Figures 4.4-2 and 4.4-3. — RMC Pacific VernalisQuarry Mining and Reclamation Project 4.4-12 ESA/203015 Administrative Dmft EIR March 2004