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MOUNTAIN HOUSE NEIGHBORHOOD' 'PROJECT INITIAL STUDY As cited above, the incremental increase of traffic added by Neighborhood"F"to the surrounding freeway system would reduce peak hour levels of service. Because the overall Mountain House project is not expected to exceed the levels projected in the Master Plan EIR, the mitigation measures cited for the project under interim conditions in the Master Plan EIR shall remain. The project would need to contribute its fair share of areawide freeway system improvements. The amounts associated with these contributions are not the subject of this environmental assessment. b. Exceed, either individually or cumulatively, a level of service standard established by the county congestion management agency on designated roads or highways? The full buildout of the current Master Plan is expected to generate less traffic than anticipated in the Master Plan EIR(see Table V-8). With construction of all recommended mitigation measures and the project's contribution to the costs for off-site improvements, the project impacts for Neighborhood"F" would be reduced to less-than-significant levels. However, two new cumulatively impacted roadways have been identified using the year 2010 travel demand model. These include: 1. Tracy Boulevard north of Lammers Road, and 2. Grant Line Road(new)east of Byron Road Implementation of the following mitigation measures would reduce the cumulative impacts at the segments of Tracy Boulevard and Grant Line Road to less-than-significant levels. Mitigation Measure TRAFFIC-4: Tracy Boulevard(north of Lammers Road) shall be widened, as necessary,from two to four travel lanes to accommodate cumulative, regional traffic volume increases The County shall initiate discussion and coordinate with the City of Tracy regarding the improvements. This widening project shall be added to the San Joaquin County TIMF once improvement designs and cost estimates are completed,then development within Mountain House shall pay its fair share of the improvements through participation in the TIMF by paying TIMFfees at issuance of building permits. Mitigation Measure TRAFFIC-5: One of the following options shall be implemented for New Grant Line Road when constructed east of Byron Road. Option 1: Widen Grant Line Road from jour to six lanes, as necessary, to accommodate cumulative, regional traffic volume increases. The County shall initiate discussion and coordinate with the City of Tracy regarding financing the improvements should the City of Tracy adopt the widening project in the future. Development within Mountain House will then pay its fair share of the improvements through participation in any County financing, such as the TIMF, by paying any such fees at issuance of building permits. Option 2: Change the level of service standard for the segment similar to Mitigation Measure M4.125(e) in the Master Plan EIR This allows the use of LOS D rather than LOS C as the threshold of significance. Status of Cumulative Traffic Models The travel demand models used to estimate both year 2000 and 2010 project impacts in the Master Plan EIR were not available for this assessment. Rather, San Joaquin County has updated the former models. For this assessment, an extensive review of the land use assumptions within San Joaquin County and the C:UoeSWCVNMAL MUDrRNAL NnIAL=Y-PARn.D0C(721100) 60 V.F. TRANSPORTATION-TRAFFIC