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1 BENDER READY -MIX CONCRETE MANUFACTURING PROJECT Initial Study /Mitigated Negative Declaration L� �1 u LJ' n (e) Noise sources associated with construction, repair, remodeling, or grading of any real property, provided said activities do not take place between the hours of 8 :00 p.m, and 7:00 a.m. on weekdays, including Saturday, or any time on Sunday or a federal holiday. NOISE MEASUREMENTS In order to quantify existing ambient noise levels in the project area, RBF Consulting conducted noise measurements on September 14, 2010; refer to Table 4.12 -3, Noise Measurements. The noise measurement sites were representative of typical existing noise exposure on -site and immediately adjacent to the project site. The first measurement was taken in the center of the project site, south of the maintenance /office building and concrete batch processing equipment. The second measurement was taken within the apartment complex to the west. Ten - minute measurements were taken at each site. Meteorological conditions were clear skies, warm, with light wind speeds (one to three miles per hour), and low humidity. Table 4.12.3 Noise Measurements Noise monitoring equipment used for the ambient noise survey consisted of a Briiel & Kjaer handheld Analyzer Type 2250 equipped with a 4189 pre - polarized microphone. The monitoring equipment complies with applicable requirements of the American National Standards Institute for Type I (precision) sound level meters. The results of the field measurements are indicated in Appendix E, Noise Data. EXISTING STATIONARY SOURCES The project area is highly urbanized, consisting of a mix of industrial /manufacturing and residential uses. The primary sources of stationary noise in the project vicinity are industrial /manufacturing- related activities. The noise associated with these sources may represent a single -event noise occurrence, short -term, or long -term /continuous noise. EXISTING MOBILE SOURCES Existing mobile source noise in the project area is generated from mobile sources along Santa Fe Street and the Union Pacific railroad. Mobile source noise along Santa Fe Street is primarily from trucks accessing the nearby industrial and manufacturing facilities. The Santa Fe railroad adjoins the project site to the west, which represents the single loudest source of mobile source noise. ' a) 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? Less Than &nificant Impact. It is difficult to specify noise levels that are generally acceptable to everyone; what is annoying to one person may be unnoticed by another. Standards may be based on documented complaints in response to documented noise levels, or based on studies of the ability of people to sleep, talk, or work under various noise conditions. However, all such studies recognize that JULY 2011 4.12 -3 NOISE 31A-77 "x�n Center of the project site (south of the 1 maintenance /office building and concrete batch 66.8 46.9 85.8 102.9 10:02 AM equipment) 2 Apartment complex at the terminus of East Camile Street, adjacent to the west of the site 52.4 43.1 70.8 88.5 10:25 AM Source: RBF Consulting, September 14, 2010 Noise monitoring equipment used for the ambient noise survey consisted of a Briiel & Kjaer handheld Analyzer Type 2250 equipped with a 4189 pre - polarized microphone. The monitoring equipment complies with applicable requirements of the American National Standards Institute for Type I (precision) sound level meters. The results of the field measurements are indicated in Appendix E, Noise Data. EXISTING STATIONARY SOURCES The project area is highly urbanized, consisting of a mix of industrial /manufacturing and residential uses. The primary sources of stationary noise in the project vicinity are industrial /manufacturing- related activities. The noise associated with these sources may represent a single -event noise occurrence, short -term, or long -term /continuous noise. EXISTING MOBILE SOURCES Existing mobile source noise in the project area is generated from mobile sources along Santa Fe Street and the Union Pacific railroad. Mobile source noise along Santa Fe Street is primarily from trucks accessing the nearby industrial and manufacturing facilities. The Santa Fe railroad adjoins the project site to the west, which represents the single loudest source of mobile source noise. ' a) 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? Less Than &nificant Impact. It is difficult to specify noise levels that are generally acceptable to everyone; what is annoying to one person may be unnoticed by another. Standards may be based on documented complaints in response to documented noise levels, or based on studies of the ability of people to sleep, talk, or work under various noise conditions. However, all such studies recognize that JULY 2011 4.12 -3 NOISE 31A-77