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of the proposed Koster Road Quarry, no hauling is expected during the PM peak hour (4:00-6:00 PM). The hours of quarry operation would be from 5:00 Ann to 4:00 PM. Some night hauling may be required to serve public sector agency projects, but this would not occur during the PM peak hour. Five to ten employees would be employed on-site, all of which would arrive before the AM peak hour and depart before the PM peak hour. The proponent has stated that a maximum of 150 truck loads of material would be generated by the quarry, daily. A maximum of 20 truck loads would be generated during the AM peak hour. A total of 40 trips would be generated during the AM peak hour: 20 empty trucks would enter the quarry and 20 loaded trucks would depart. For the purposes of the analysis of traffic and circulation impacts, truck trips were converted to passenger car equivalents. The Highway Capacity Manual defines the passenger car equivalence (PCE) for trucks on level terrain as 1.5 PCEs per truck. Because of the special operating characteristics of gravel trucks, one gravel truck trip was considered equivalent to 2 passenger cars. This value represents an average PCE for gravel trucks (a loaded truck may occupy more of the roadway capacity than 2 passenger cars and an empty truck may occupy less capacity). Trip Distribution Unique trip distribution estimates were developed for each of the project Project Trip Distribution Alternative 1: Delta Mendota Crossing y r alternatives. For Alternative 1, where the quarry access Bird Rd 45% Koster Rd ` ♦ 30% $D% 10% SR 132 would be provided on Koster Road, the predominate movement of truck traffic was _ 5% 5% 90% assumed to be on Koster Road north of i 5% 5% 5% Blewatt Rd Blewett Road. The distribution of truck 100% 5% Site trips for Alternative 1 (proposed project) is shown in Figure 4.4-2. 5% i� Gaflery Rd IT 5 Figure 4.4-2 Draft Environmental Impact Report 4-42 ER-96-3