2019-047 - Adopting Mitigated Negative Declaration Environmental Review No. 2018-75

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b) Result in the loss of availability of a locally important mineral resource recovery site delineated on a local general plan, specific plan or other land use plan? No Impact. See Response to section "Xll.a)" above. XIII. NOISE: Would the project result in: a) Generation of substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance or applicable standards of other agencies? Potentially Significant Unless Mitigation Incorporated. A Noise report31 was prepared for the project. A copy of the noise report is attached in Appendix E. Temporary Noise The existing noise levels on the site and the noise levels in the immediate vicinity of the site would increase temporarily during project construction. Short-term construction noise would be generated during demolition of the existing church, church parking lot and other site improvements to grade the site, excavate for the one level of subterranean parking, construct the residential building and construct the other proposed site improvements. Noise would be generated by construction workers commuting to the site, the delivery of materials and supplies to the site, the operation of on -site electrical construction equipment, etc. Construction noise represents a short-term impact on the ambient noise levels both on the site and the adjacent surrounding communities. Noise generated by the equipment that would be used for demolition and construction equipment, including trucks, graders, bulldozers, concrete mixers and portable generators can reach high levels. The existing noise -sensitive uses in the immediate project vicinity would be exposed to increased noise levels from the on -site construction activities. In typical construction projects, including the proposed project, the loudest noise generally occurs during demolition and grading activities because they involve the largest pieces of construction equipment. The maximum noise levels that are generated by the construction equipment that would be used during project construction are shown in Table 11. The construction equipment noise levels shown in Table 12 are maximum sound levels (Lmax), which are the highest individual sound occurring at an individual time period. Operating cycles for these types of construction equipment may involve one or two minutes of full power operation followed by three to four minutes at lower power settings. Other primary sources of acoustical disturbance would be due to random incidents, which would last less than one minute (such as dropping large pieces of equipment or the hydraulic movement of machinery lifts). Table 11 Typical Construction Equipment Noise Levels Type of Equipment Sound Levels Measured (dBA at 50 feet) Suggested Maximum Sound Levels for Analysis (dBA at 50 feet) Rock Drills 83-99 96 Jack Hammers 75-85 82 Pneumatic Tools 78-88 85 Pumps 74-84 80 3i Legacy Sunflower Project, Noise Impact Analysis, Gandinni, January 23, 2019. Legacy Sunflower Apartments Page 66 Mitigated Negative Declaration — March 14, 2019