P & D CONSULTANTS - 2002 - Laserfiche WebLink

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Grand Avenue Widening Project Environmental Impact Report Section 3.0 • The operation of construction equipment which generates substantial noise levels or levels noticeably above general construction noise shall be limited to between the hours of 10 AM and 4 PM, to the extent feasible. • All construction equipment shall be properly muffled, operated consistent with the manufacturers' specifications and maintained in good working order to reduce equipment related noise generation. • Temporary noise barriers shall be installed and used adjacent to sensitive land uses during periods when the loudest construction activities are occurring. • All construction activities shall comply with applicable State and local construction noise regulations. Analysis of Mitigation for Lona Term Noise hnnacts Traffic Noise Mitigation. There are a number of strategies for mitigating noise impacts from road noise sources. The most common measures are (1) reducing the noise emission levels from the noise source. (2) blocking the noise transmission paths with a noise barrier.' (3) shielding the receiver from noise by increasing the noise reduction characteristics of the building. These potential noise reduction strategies are described below. Noise Source Reduction The control of motor vehicle noise emission levels comes under the jurisdiction of the State of California and the City of Santa Ana has no authority to make changes related to the noise emissions from motor vehicles. The only means a local agency such as the City has in controlling noise levels from motor vehicles are by controlling vehicle speeds and truck traffic. The City could enact an ordinance restricting heavy trucks (those with three or more axles) from traveling on the project segment of Grand Avenue in the project area to reduce traffic related noise levels. However, the elimination of heavy trucks from the Grand Avenue traffic mix would reduce the 2020 with project noise level by only 0.5 dB, which is insignificant. Required Noise Barriers As discussed previously, the City of Santa Ana is proposing to acquire properties adjacent to the project segment of Grand Avenue to accommodate the proposed widening under Alternatives 1 and 2. The removal of units from the first row of residential dwellings adjacent to Grand Avenue will subject units in the second row of dwellings to increased noise levels. In some cases, the increased noise level at the property line of the second row of dwellings will be in excess of the City's exterior noise standard. F.- PROJ-ENMGrand eirWew Text- Gran&Section 3 Spli4Section 3.6.doc Page 3.6-38