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vicinity, this route has two lanes, with a center left-turn lane through Lockeford and <br /> Clements. State Route 12 extends from Santa Rosa in Sonoma County, to the west, to <br /> San Andreas in Calaveras County to the east of the project area. Locally, State Route 12 <br /> connects Lodi to State Route 88 south of Lockeford. State Route 99, approximately 10 <br /> miles to the west of the project area, is a major north-south transportation corridor <br /> through California's Central Valley. In the project vicinity this route provides access to <br /> Sacramento to the north and Modesto to the south. <br /> Local county roads in the project area include Tully Road and Mackville Road, <br /> both north-south routes and Jahant Road and Collier Road, both east-west routes. <br /> These roads are all two-lane roadways, are well maintained, and are currently in good <br /> condition. <br /> Access to the existing processing facility and quarry is provided by a paved, <br /> private road off of Jahant Road at Linn Road. Jahant Road connects the project site to <br /> Mackville Road, east of the site, and State Route 99 to the west. <br /> Existing Quarry Traffic <br /> Trip Generation <br /> The existing processing facility and quarry operation currently operates from <br /> approximately 6:00 a.m. to 6:00 p.m., Monday through Friday, and generates an average <br /> of 200 truck trips per week. There are no peak periods for the project; therefore, it can <br /> be assumed that the truck trips are generated evenly throughout the day. Based on this <br /> assumption the quarry generates 40 daily trips with approximately 4 trips during the a.m. <br /> and p.m. peak hours. Because these are one-way trips, half of these trips can be <br /> assumed to be traveling to the site and half traveling from the site during either of the <br /> peak periods. <br /> Trip Distribution <br /> The potential influence of quarry related truck traffic on the operation of <br /> intersections in the project area is a function of the distribution of truck trips to and <br /> from the facility. The distribution, i.e., direction of travel and routes used, of these <br /> trips varies with the market area being serviced. Figure 3.4-3 shows the distribution <br /> 58 <br />