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4.2 TRAFFIC AND CIRCULATION north again approximately 2,000 feet west of the first corner. Large trucks could have trouble negotiating both corners traveling in either direction. In addition to these two corners, southbound right-turning trucks at the Peltier/Davis intersection could have trouble negotiating the turn due to the limited turning radius. Mitigation 4.2-2 The portions of Davis Road north of Peltier Road which have corners too narrow for excavation trucks to negotiate should be widened and repaved to accommodate large truck turning movements preceding the excavation process. (approximately 40 45 feet tufnin fadius)preeeding the The County uses a standard of 96-foot minimum turning path diameter, or 48 foot turning radius, which measures the distance between the outermost point of a truck at the beginning of a U-turn to the same point of the truck after the U-turn is completed. Construction Impacts on Road Conditions In addition to the traffic operations associated with construction of the proposed project, the potential impacts of the excavation trucks on the structural integrity of the roads was also examined. Impact 4.2-3 Project construction truck trips generated by excavation of the site would increase the demand for roadway maintenance. Although the project is not expected to create new long-term vehicle traffic, its construction phase would involve a substantial number of truck trips for removal of excavated soil for off-site disposal. These truck trips would be along Davis Road, Peltier Road, Ray Road, and Kile Road. Caltran's Design Manual(Caltrans, 1990)provides a specific method for calculating a roadway's needed structural section. The calculation is directly related to the volume of heavy truck traffic over the "design period" of the roadway. The roads along the proposed haul route should be considered to have a 10-year design period. The appropriate structural sections were calculated for existing truck traffic and truck traffic with the project's excavation and material hauling. (See Appendix B for detailed calculations.) On Davis Road, there is virtually no heavy truck traffic. While this EIR cannot provide a detailed roadway design, it is likely that the hauling during the excavation of the lakes would cause noticeable deterioration in the pavement and overall structural sections. Peltier Road currently has moderate truck traffic. While the project would add measurably to the truck traffic volumes,it's effects on the pavement surface would be less pronounced. The added truck traffic equates to an additional five to six percent in the required overall pavement section thickness. This variation would not be considered a measurable 4.2-18