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4.2 TRAFFIC AND CIRCULATION Impact 4.2-1 Paved roadway widths of 18 feet as shown on the site plan are inadequate. San Joaquin County Public Works Department staff has indicated that 20-feet wide paved roads are required in order to ensure sufficient distance between opposing directions of traffic,as well as adequate emergency vehicle access (Kelly, 1992). Given the County requirements,a right of way width of 28 feet could be provided within the road width proposed in the project site plan. However, the allocation of paved travel lane widths to gravel shoulder widths needs to be redistributed. Mitigation 4.2-1 The project's collector streets should be constructed to include one 10-foot wide paved travel lane in each direction with 4-foot wide gravel shoulders,for a minimum overall road width of 28 feet. Traffic Operation During Construction As part of the property development the project applicant has proposed excavating soil from the seasonally existing Tracy Lakes in order to create a year round water supply in the lakes. Based upon information supplied in the Quarry Excavation Application Form submitted by the project applicant (Quarry Excavation Application Form, 1989), 1,600,000cubic yards of soil would be excavated. Most of this excavated soil would be trucked to one or more off-site locations,with most of the soil transported to the New Hope Levee project along the south bank of the Mokelumne River, approximately four miles west of the project site. In order to identify the potential impacts to the operating conditions of the studied roads and intersection network, the anticipated number of truck trips caused by the excavation were calculated and distributed to the street network. The application calls for the excavation of 1,600,000 cubic yards of soil to be excavated,with 250,000 cubic yards retained on-site, resulting in 1,350,000 net cubic yards to be removed from the site. The proposal calls for the soil to be hauled by trucks to the New Hope Levee Improvement Project to strengthen the Mokelumne River levees. The soil would be loaded into trucks at the existing Tracy Lakes site then hauled south across the proposed bridge over the Mokelumne River to Davis Road,west on Peltier Road, north on Ray Road, then west again on Kyle Road for approximately one mile, then north on a proposed private road to the Mokelumne River. The empty trucks would return to the borrow site by the same route in the opposite direction. Given this route, only two of the studied intersections, Peltier/Davis and Peltier/Ray, would experience truck trips during the excavation. 4.2-15