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5.ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 11. NOISE activity areas to an Ldn of sixty(60)dB or less,an exterior noise level of up to,but not exceeding an Ldn of sixty-five(65)dB may be allowed by the Review Authority. (2) Exterior noise levels shall not create an interior noise level exceeding forty-five(45)dB. (3) Noise studies for specific residential projects proposed in areas with noise levels from mobile sources above Ldn sixty(60)dB shall address how noise levels in outdoor areas could be maintained at or below an Ldn of sixty-five(65)dB. (c) Standards for Other Specified Uses. (1) Noise-sensitive land uses other than residential uses shall not be allowed where noise levels due to stationary noise sources would exceed the exterior noise level standards set forth in Table 9-1025.9. (2) On school sites and other noise-sensitive land uses,any outdoor instructional areas or areas which require speech audibility shall be located outside the sixty(60)dB Ldn noise contour from mobile sources or shielded from mobile noise in excess of sixty(60)dB Ldn. (3) Exterior noise levels shall not create an interior noise level exceeding forty-five(45)dB. (4) Noise studies prepared for noise-sensitive land uses shall address how noise levels in outdoor areas from mobile sources shall be maintained at or below an Ldn of sixty(60)dB. Significant Impacts Identified in 1994 MEIR The 1994 MEIR identified significant noise impacts related to the following: 1) Compatibility of the proposed uses with the future onsite noise environment; 2) Impacts on existing land uses in the area due to project-generated traffic noise increases; 3) Impacts on future residences due to agriculturally-generated noise on parcels adjacent to the community of Mountain House;and 4) Potential aircraft overflight noise impacts. Findings Related to Significant Impacts Identified in 1994 MEIR For all of the potential noise impacts,the Master Plan was amended as recommended in the 1994 MEIR mitigation measures. One exception was that the recommended acceptable outdoor noise level of an Ldn of 60 dB was raised to 65 dB to be consistent with the Noise Element of the San Joaquin County General Plan. Also, the original 1994 MEIR-recommended mitigation measures to reduce noise from agricultural machinery and helicopters were not adopted. Discussion Regarding Neighborhoods K and L a) Would the project result in 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? i9mil) 5-138