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MOUNfAM HOUSE PROPOSED MACHADO TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST 4.11 Nom DISCUSSION REGARDING PROPOSED PROJECT a) Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? Future development of the Mountain House Community, including the proposed project,will result in noise levels that could exceed standards established in the Development Title for the Mountain House Community. Noise would be generated by increased traffic along I-205, Mountain House Parkway, and local arterial and collector streets within the Specific Plan III area in which the project site is located. Noise would also be generated by operations at the commercial/office and limited industrial land uses located on the east side of the project site. The impacts on sensitive receptors (i.e., residences and schools)from these sources of noise were addressed in the SPIIIEIR, and mitigation measures were proposed that would make the impacts less than significant when implemented. The tentative map for the proposed project — shows 6.5-foot high sound walls along the entire south side of Grant Line Road and the entire west side of DeAnza Boulevard to reduce traffic noise in residential areas(Associated Engineering, 2006). Some commercial/office and limited industrial land uses on the east side of the project site could be located within 100 feet from the centerline of Mountain House Parkway. The anticipated Ld„ at this distance due to traffic on Mountain House Parkway in the future is expected to be 74 dBA. The Noise Element of the County General Plan noise levels inside office buildings should not exceed an Ldn of 45 dBA. With double-pane windows and proper — exterior wall insulation, an office building will typically reduce noise levels by 30 to 35 dBA. Therefore, noise levels within the offices should be less than 45 dBA(Mills Associates, 2005). Mitigation Measure No additional mitigation measures are required. b) Exposure of persons to or generation of excessive ground borne vibration or ground _ borne noise levels? There are no potential ground-borne vibration sources associated with the proposed project. _ It is not anticipated that any commercial or limited industrial activity on the east side of the project site would generate significant vibrations that would generate noise. Limited industrial uses include light manufacturing, electronics, high technology businesses,and light warehousing(EDAW, 2005a,Table 3.2). Thus,no impacts due to ground-borne vibration or ground-borne noise would be expected. Mitigation Measures No mitigation measures are required. 4-58