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MOUNTAIN HOUSE NEIGHBORHOOD' 'PROJECT INITIAL STUDY exceptions are Grant Line Road(new)east of Byron Road and Tracy Boulevard north of Lammers Road. On seven roadway segments, significant impacts identified in the Master Plan EIR would no longer be significant under the revised 2010 analysis. These roadway segments include: 1. Patterson Pass Road south of I-205, 2. Patterson Pass Road north of Grant Line Road, 3. Grant Line Road(existing)east of Byron Road, 4. 11th Street east of I-205, 5. 11th Street east of Corral Hollow, 6. Middle/Arbor east of Tracy Boulevard, and 7. Stanford Extension east of Paradise Road. As noted above, the revised 2010 model did not include the new parallel roadway along the Middle Road/Arbor alignment between Mountain House and the City of Lathrop,which results in lower traffic volumes along Middle Road/Arbor east of Tracy Boulevard and Stanford Extension east of Paradise Road but higher levels on I-205 east of I-580. To mitigate the impacts on the new Grant Line Road, two options are available. Option one would require widening from two to four travel lanes. Option two would require adopting a higher level of service threshold for this facility. Level of Service D is the current standard for Grant Line Road inside of the Mountain House Community and within 1/4 mile from 1-205 in the Tracy Planning Area. Level of service C is currently the standard for the segment of Grant Line Road between the prior road segments. Under Option two the level of service for this segment would be changed to level of service D. If Option one is selected, the County would 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 would then pay its fair share of the improvements through participation in any County financing such as the TIMF. To mitigate impacts to Tracy Boulevard, north of Lammers Road, widening to four travel lanes would be required. With widening,this roadway would operate at an acceptable level of service. This widening project would be added to the San Joaquin County TIMF once improvement designs and cost estimates are completed;then development within Mountain House would pay its fair share of the improvements through participation in the TIMF. Further, the implementation of safety and operational improvements on the Altamont Pass west of Grant Line Road still results in LOS F after mitigation, which is similar to the findings of the Master Plan EIR. No additional findings for this significant, unavoidable impact are necessary for this Initial Study. c. Result in a change in air traffic patterns, including either an increase in traffic levels or a change in location that results in substantial safety risks? The development of Neighborhood"F" and the build out of the Mountain House New Community does not have a significant impact on air patterns. C:voeMC\TNmAL S=Y\MAL1NmALMUDY-PARn.D0C(7/700) 70 V.F. TRANSPORTATIONn RAFFIC