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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Transportation and Traffic "- vicinity of the project and provides the major artery between the project vicinity and aggregate consumers to the north and south. ■ I-580 is an interstate freeway that originates at the I-5/I-580 freeway-to- — freeway interchange and generally extends south to north along the east side of the San Francisco Bay before terminating at an interchange with U.S. 101 in Marin County. I-580 provides regional access between the Bay Area and _ cities in the San Joaquin Valley, generally via connections with I-205 near Tracy and SR 132. I-580 is a four-lane freeway in the project vicinity. ■ SR 132 is an east-west state highway that begins at the junction with I-580 and ends at SR 49 at Coulterville in Mariposa County. The highway is a major connector between 1-580,1-5, and east through Modesto. It connects to 1-5 and I-580 via interchanges. Through the study area, SR 132 is used as a — commute route between the Modesto urban area located to the east and the south bay area located to the west and north. SR 132 is a two-lane highway except for short four-lane section near the interchanges with 1-5 and 1-580. — Improvements are proposed at the SR 132/Bird Road interchange and are discussed further below. At the time of preparation of this document,the SR 132/Bird Road interchange is anticipated to be under construction by late spring 2007 with construction completed by the middle of 2008. During construction, a new temporary intersection will be constructed on SR 132 just east of the existing SR 132/Bird Road at-grade intersection that will provide access to Bird Road both north and south of SR 132. County Roads — Near the project area,Koster Road, Bird Road, and Blewett Road handle primarily local traffic to and from residential and agricultural uses. These roadways at their current width and consistency with County standards,are described further below. ■ Koster Road is a two-lane north-south county local rural road that extends from Stanislaus County north to Linne Road in San Joaquin County. The road intersects SR 132 approximately 1 mile east of the I-5/SR 132 — interchange at a four-way at-grade intersection with stop sign control. San Joaquin County's current typical cross section for a rural road is a 32-foot paved roadway. The existing 20-22 foot paved roadway cross section would be considered nonstandard based on the current County standards. ■ Bird Road is a north-south county rural collector road that provides access between the project site and SR 132. It extends from south of Blewett Road — north to Grant Line Road. The roadway is currently two lanes and intersects SR 132 approximately 2.25 miles east of I-580 and approximately I mile west of 1-5 at a four-way at-grade intersection with stop sign control. The section of Bird Road from just south of Blewett Road north to the intersection with Blewett Road was improved within the last 10-years to a two-lane,48-foot wide paved roadway(two 20-foot travel lanes with 4-foot _ shoulders). At the same time, the section of Bird Road from the intersection with Blewett Road north to the intersection with SR 132 was improved to a DeSilva Gates Quarry Project Draft Environmental Impact Report 3.L-2 As 05105.05