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Traffic Impact Study March 24,2004 Proposed RMC Pacific Mining Site Page ES-1 EXECUTIVE SUMMARY ` This report presents the results of a traffic impact study performed for a proposed mining site. The analyses focus on the potential impact that traffic generated by the project may have on nearby roads and intersections. r A new mining site is proposed by RMC Pacific Materials, Inc. within the area bound by State Route (SR) 580, SR 132, and Koster Road in Vernalis, California. Specifically, the site is ` located southeast of the intersection of Blewett and Koster Roads. Several other mining operations currently exist in the vicinity of the site. The proposed mining operation will produce aggregate products that will be shipped to Stockton, Modesto, Sacramento, and the Bay Area via ` 25-ton-capacity trucks. The project is expected to generate an annual average of 2.85 million tons of material, with a peak annual production of 4.0 million tons of material. 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. The following two haul routes are proposed: Haul Route 1: All trucks entering and exiting the site use Blewett Road and Bird Road. Ten 6. percent of trucks travel on SR 132 west of Bird Road. Ninety percent of trucks access the SR 132/I-5 interchange. Seventy percent of trucks travel on I-5 north of SR 132. Five percent of trucks travel on I-5 south of SR 132. Fifteen percent of trucks travel on SR 132 east of I-5. Haul Route 2: Similar distribution to Haul Route 1, with the exception that trucks will have the option of using Koster Road for access to and from SR 132. In this case, it is anticipated that ` trucks leaving the site and traveling east on SR 132 will make right tums at Koster/SR 132. Trucks entering the site from the east may make left turns at Koster/SR 132. Trucks entering the site from I-5 north of SR 132 would likely travel east on SR 132 and turn right at Koster. Due to L difficulties in making left turns, it is anticipated that few trucks would leave the site traveling northbound on Koster and making a left turn to westbound SR 132. '` An approved mining site that is not yet in operation exists on Bird Road south of Blewett Road. The typical peak hour project traffic anticipated to be generated by the project is included in the analyses. 6' The study intersections and road segments were determined based on their proximity to the site and the amount of project traffic expected. This report includes analysis of the following intersections: L b. L L