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MOUNTAIN HOUSE PROPOSED ALTAMONT HEIGHTs TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST 4.15 TItANSPORTATION/TRAFFIc Great Valley Parkway, Central Parkway,and DeAnza Boulevard will be four lanes(two . lanes per direction). Mountain House Parkway from Mascot Boulevard to Vont Sosten Road and Byron Road from Central Parkway to Henderson Road will be improved to six lanes, (three per direction). Mountain House Parkway from south of Von Sosten Road to the_ freeway,will be improved to eight lanes(four lanesper direction) (EDAW, 2005b). . The SPIIIEIR summarizes the mitigation measures}for 2025 buildout conditions (EDAW, 2005b, Table 4.11-18)_ MEIR Mitigation M 4.12-1[h] requires annual traffic monitoring and a report reviewing the progress of the required transportation improvements. Based on the findings in the annual reports, San Joaquin County can adopt additional findings related io Whether the adopted trigger points for transportation improvements and a specific project's fair share of costs should be revised as a condition of further development approvals to ensure the timely construction of needed improvements. According to the MSIR, "As an alternative to widening the 1-205 freeway beyond six lanes, the sponsor of the Mountain House Community shall contribute a fair share to the development of a parallel east-west roadway system north of I-205 extending between Mountain House and the City of Lathrop's Gold Rush City development, including4he necessary multi jurisdictional alternative/feasibility studies." Despite the mitigation measures identified in the MEIR and the SPIIIEIR and the Mountain House Traffic Impact Fee/San Joaquin County Traffic Impact Mitigation Fee program,traffic congestion on Altamont Pass Road west of Grant Line Road and on segments of 1-205, 1-580, and I-5 would remain a significant and unavoidable impact. Mitigation Measures Traffic mitigation measures were proposed in the MEIR and the SPIIIEIR. There is no additional mitigation available to reduce the levels of impact, and the impact remains as significant and unavoidable. e) 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 nearest airport is the Byron Airport that is located approximately four miles northwest of the project site. The proposed project would not result in changes in air traffic patterns. Mitigation Measures No mitigation measures are required. d) Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g.,farm equipment)? All of the streets in the Altamont Heights project would be designed and constructed in conformance with MHCSD standards including adequate radii at curves and cul-de-sacs and proper sight distances. The proposed project would not introduce new traffic hazards. 4-77