06 16 20 PWA_02_02 Exh2 - IS-MND

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INITIAL STUDY/MITIGATED NEGATIVE DECLARATION FAIRVIEw BRIDGE REPLACEMENT AND STREET IMPROVEMENTS w MAY 2020 (9TH STREET TO 16TH STREET) PROJECT J" SANTA ANA. CALIFORNIA Table 3.13.13: Ambient Noise Measurement Results Monitor Date Start Time Duration dBA Leq Location Description Noise Sources No. (minutes) ST-1 4/17/2018 9:23 AM 20 63.4 2234 West 9th Street, in the residence backyard Traffic on Fairview Street,birds, and rooster crowing ST-2 4/17/2018 9:23 AM 20 63.8 2507 9th Street, in the residence backyard Traffic on Fairview Street ST-3 4/17/2018 9:23 AM 20 64.9 1908 King Street, in the residence backyard Traffic on Fairview Streetand birds ST 4 4/17/2018 10:28 AM 20 67.3 1007 Marengo Place, in the residence backyard Traffic on Fairview Streetand birds ST-5 4/17/2018 10:28 AM 20 65.6 2332 West 12th Street, in the residence backyard Traffic on Fairview Street ST-6 4/17/2018 11:36 AM 20 64.7 2503 West 12th Street, in the residence backyard Traffic on Fairview Street ST 7 5/10/2018 11:10 AM 20 66.7 Fairview Triangle Traffic on Fairview Street, birds, and wind ST-8 4/17/2018 10:28 AM 20 56.7 2413 West Washington Avenue, in the residence Traffic on Fairview Street backyard ST-9 4/17/2018 1:53 PM 1 20 55.7 1322 Fair Way, in the residence backyard Traffic on Fairview Street ST-10 4/17/2018 1:54 PM 20 53.3 1334 Fair Way, in the residence backyard Traffic on Fairview Street ST-11 4/17/2018 12:19 PM 20 50.0 1321 North Glenarbor Street, in the residence Traffic on Fairview Street backyard ST-12 4/17/2018 12:19 PM 20 54.5 1413 North Glenarbor Street, in the residence Traffic on Fairview Street backyard. ST-13 4/17/2018 1:12 PM 20 55.7 1417 North Glenarbor Street, in the residence Traffic on Fairview Street backyard Traffic on Fairview Street ST-14 5/10/2018 12:10 PM 20 63.0 2501 16th Street, in the residence front yard and light traffic on 16th Street ST-15 4/17/2018 1:12 PM 20 74.0 South of 1609 Fairview Street, in the residence Traffic on Fairview Street front yard Source: Compiled by LSA Associates, Inc. (May 2018). dBA Leq = equivalent continuous sound level measured in A -weighted decibels ST = short-term 3.13.2 Impact Analysis a. Would the project result in generation of a 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?' Less Than Significant with Mitigation Incorporated. Construction. Two types of short-term noise level increases would occur during construction of the proposed Project. The first type would be from construction crew commutes and the transport of construction equipment and materials to the Project area that would incrementally raise noise levels on access roads leading to the area. The pieces of heavy equipment for grading and construction activities would be moved on site, would remain for the duration of each construction phase, and would not add to the daily traffic volumes in the Project vicinity. A high single -event noise exposure potential at a maximum level of 84 dBA maximum instantaneous noise level (Lmax) from trucks passing at 50 ft will exist. However, the projected construction traffic volume would be minimal when compared to existing traffic volumes on Fairview Street R:\WKE1702\ISMND\Final ISMND\Fairview Street Bridge Final ISMND.docx (05/26/20) 3-73