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MOUNTAIN HOUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4, ENVIRONMENTAL CHECKLIST 4.15 TRANSPORTATION/TRAFFIC DISCUSSION REGARDING PROPOSED PROJECT a) Cause an increase in traffic which is substantial in relation to the existing traffic load and capacity of the street system (i.e.,result in a substantial increase in either the number of vehicle trips, the Volume l0 Capacity 'ratio on roads, or.congestion at intersections)? and b) Exceed, either individually or cumulatively, a level of service standard established by the county congestion management agency or designated roads or highways? The proposed project includes 53 single family dwelling units and 6 second units, housing approximately 170 residents_ These residents would drive cars that would contribute to the traffic analyzed in the SPIIIEIR. Complete development of the residential land uses in Specific Plan III is projected to generate 1,595 morning(AM)peak-hour vehicle trips and 2,180 afternoon(PM)peak-hour trips(EDAW,2005b,Table 4.11-7). Specific Plan III includes 2,240 dwelling units housing approximately 6,100 people (EDAW, 2005a,Table 3-13). Since the proposed project would house approximately 170 residents, it is reasonable to assume that the residents of the proposed project would generate approximately three percent of these trips. The transportation impacts of the Specific Plan III were analyzed in the context of cumulative projected growth in San Joaquin County by 2025. For this analysis,the estimated growth in the Mountain House Community at 2025 buildout was added to forecasts of housing and employment in the remainder of San Joaquin County and the surrounding region, including the nine-county Bay Area, the four-county Sacramento area,and Stanislaus County. Traffic improvements that were approved as part of the approval of Neighborhoods E, F, and G are considered part of the roadway system in this analysis(EDAW, 2005b). Table 4.15-1 presents the peak-hour trips that would be generated after the Mountain House Community is built-out in 2025. Approximately 45 percent of the peak-hour trips would be internal trips that originate and end within the Mountain House Community and 55 percent would be external trips that originate or end outside the Mountain House Community. Table 4.15-1 Peak-hour Trip Generation in 2025 After Buildout of Mountain House Community A.M. P.M. Inbound Trips 5,406 4,578 Outbound Trips 3,592 6,111 Internal Trips 6,857 9,100 Total Trips 15,855 19,789 Source: EDAW,2005b,Table 4.11-8. 4-75