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<br />Legacy Sunflower Apartments Page 66 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />b) Result in the loss of availability of a locally important mineral resource recovery site delineated <br />on a local general plan, specific plan or other land use plan? No Impact. See Response to section <br />“XII.a)” above. <br /> <br />XIII. NOISE: Would the project result in: <br /> <br />a) Generation of substantial temporary or permanent increase in ambient noise levels in the <br />vicinity of the project in excess of standards established in the local general plan or noise <br />ordinance or applicable standards of other agencies? Potentially Significant Unless Mitigation <br />Incorporated. A Noise report31 was prepared for the project. A copy of the noise report is attached in <br />Appendix E. <br /> <br />Temporary Noise <br /> <br />The existing noise levels on the site and the noise levels in the immediate vicinity of the site would <br />increase temporarily during project construction. Short-term construction noise would be generated <br />during demolition of the existing church, church parking lot and other site improvements to grade the <br />site, excavate for the one level of subterranean parking, construct the residential building and construct <br />the other proposed site improvements. Noise would be generated by construction workers commuting <br />to the site, the delivery of materials and supplies to the site, the operation of on-site electrical <br />construction equipment, etc. <br /> <br />Construction noise represents a short-term impact on the ambient noise levels both on the site and the <br />adjacent surrounding communities. Noise generated by the equipment that would be used for <br />demolition and construction equipment, including trucks, graders, bulldozers, concrete mixers and <br />portable generators can reach high levels. The existing noise-sensitive uses in the immediate project <br />vicinity would be exposed to increased noise levels from the on-site construction activities. In typical <br />construction projects, including the proposed project, the loudest noise generally occurs during <br />demolition and grading activities because they involve the largest pieces of construction equipment. <br />The maximum noise levels that are generated by the construction equipment that would be used during <br />project construction are shown in Table 11. The construction equipment noise levels shown in Table <br />12 are maximum sound levels (Lmax), which are the highest individual sound occurring at an individual <br />time period. Operating cycles for these types of construction equipment may involve one or two <br />minutes of full power operation followed by three to four minutes at lower power settings. Other primary <br />sources of acoustical disturbance would be due to random incidents, which would last less than one <br />minute (such as dropping large pieces of equipment or the hydraulic movement of machinery lifts). <br /> <br />Table 11 <br />Typical Construction Equipment Noise Levels <br /> <br /> Suggested Maximum <br /> Sound Levels Measured Sound Levels for Analysis <br />Type of Equipment (dBA at 50 feet) (dBA at 50 feet) <br />Rock Drills 83-99 96 <br />Jack Hammers 75-85 82 <br />Pneumatic Tools 78-88 85 <br />Pumps 74-84 80 <br /> <br />31 Legacy Sunflower Project, Noise Impact Analysis, Gandinni, January 23, 2019. <br />6-88