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4.11 TRANSPORTATION This section has been prepared by the Mountain House Community Services District's(MHCSD's)traffic consultant for the project,TJKM Transportation Consultants(TJKM).The purpose of this section is to evaluate the traffic impacts related to the development of the proposed College Park project,and to determine the infrastructure needed to support the proposed development and to mitigate its traffic impact. 4.11.1 PHYSICAL SETTING The buildout of the Mountain House community will include 12 neighborhoods and a Town Center that include residential,retail,and commercial development.It is planned to be a self-sufficient community with its own schools, parks,and public facilities.The College Park project covers the southern portion of the Mountain House Master Plan (MHMP)area and includes MHMP Neighborhoods A and B,and the eastern portion of Neighborhood D.The project site and its vicinity are shown in Figure 4.11-1.The proposed concept plan is shown in Figure 4.11-2. To date,MHMP Neighborhoods E,F,and G have been approved for development as part of Specific Plan I along with mitigation measures to address impacts of this development,including traffic impacts.Concurrent with the _ traffic analysis described below are other ongoing traffic analyses,including those for the Specific Plan II area located north of the College Park project site and the Mountain House Business Park located southeast of the project site.The MHCSD will manage Mountain House public facilities. REGIONAL ROADWAYS The project is served regionally by Interstate 205 (I-205),located just south of the project site(Figure 4.11-1).I- 205 provides access to Tracy and Interstate 5 (I-5)to the east and to Interstate 580(I-580)to the west,which connects with the greater San Francisco Bay Area(Bay Area)and Silicon Valley employment centers.It has six lanes in the vicinity of the project site. The I-205/Mountain House Parkway interchange is located between interchanges serving Eleventh Street to the east and I-580 to the west. Currently,Mountain House Parkway is a two-lane undivided roadway.The existing interchange on I-205 has a two-lane overpass(one lane in each direction).The MHCSD is preparing a Project 4 Study Report(PSR)that analyzes a proposed project that consists of widening the existing two-lane overpass to six lanes to provide three northbound and three southbound lanes,constructing a southbound-to-eastbound loop on-ramp, and modifying the ramps to the existing intersections.The PSR has been approved and construction is expected to begin in 2005. State Route(SR)4,another roadway of regional importance,runs east-west approximately 10 miles north of the project site.Tracy Boulevard and I-5, east of the project site,connect with SR 4. LOCAL ROADWAYS Grant Line Road,Mountain House Parkway, and Byron Road provide local access to the freeway and the immediate areas (Figure 4.11-1).Von Sosten Road connects Mountain House Parkway and Byron Road. Grant Line Road is a two-lane east-west road that runs parallel to and north of I-205.It provides access to the City of Tracy and also connects to the I-580 freeway to the west of I-205 via Altamont Pass Road.It is generally a rural road with posted speeds limits of 45 miles per hour. Mountain House Parkway is a two-lane north-south roadway that provides a connection between I-580 on the south and Byron Road on the north.It forms the eastern boundary of the Mountain House community south of Byron Road.The segments adjacent to the College Park site are expected to be widened to four lanes within the next two years by Trimark Communities(Trimark). College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.11-1 Transportation