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BENDER READY-MIX CONCRETE MANUFACTURING PROJECT Initial Study/Mitigated Negative Declaration Ground-bome vibration decreases rapidly with distance. The proposed protect would involve soldier piles; however, piles would not be driven and would not require pile driving equipment. As indicated in Table 4.12-61 based on the FTA data, vibration velocities from typical heavy construction equipment operations that would be used during project construction range from 0.003 to 0.076 inch-per-second peak particle velocity (PPV) at 25 feet from the source of activity. The bulk of the construction activities would occur at least 40 feet from the nearest adjacent building. Therefore, vibration from construction activities experienced at the nearest adjacent building and sensitive residential uses would be expected to be below the 0.20 inch-per-second PPV significance threshold. Thus, a less than significant impact would occur in this regard. Mitigation Measures: No mitigation is required. ' c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? Less Than Significant Impact. If the ambient noise environment is quiet and the new noise source increases the noise exposure, an impact may occur even though a criterion level might not be exceeded. OPERATIONAL MOBILE NOISE IMPACTS The proposed project consists of site improvements that would not generate additional traffic on adjacent roadways following completion of construction. Approximately 88 trips are currently generated by the existing facility (accounting for 12 full-time employees and assuming 20 concrete truck loads per day). Exhibit 5 (Transportation Noise Sources) of the City's General Plan Noise Element identifies average daily traffic (ADT) along 11t Street, Grand Avenue, and Main Street (to the north, east, and west of the project site, respectively) to be between 20,000 and 30,000 vehicles per day. Noise levels ' associated with the ADTs along these roadways are 65 dBA at 50 to 100 feet from the roadway. Exhibit 5 of the City's General Plan Noise Element indicates ADTs along McFadden Avenue to be between 10,000 and 15,000, with an associated noise level of 65 dBA at zero to 25 feet from the roadway. The project's 88 trips account for 0.29 to 0.44 percent of ADTs along 111 Street, Grand Avenue, and Main Street, and 0.44 to 0.88 percent of ADTs along McFadden Street (assuming the worst case that all 88 trips occur along each roadway). Therefore, as the project-related traffic constitutes a nominal amount of ADTs along nearby roadway segments, the noise associated with this amount of traffic is also nominal. Traffic generated by current operations at the facility does not create a significant noise impact, and vehicular noise in the vicinity of the project site would not increase as a result of proposed aesthetic, drainage, water quality, and safety improvements associated with the ' project. Impacts are less than significant in this regard. OPERATIONAL STATIONARY NOISE IMPACTS Stationary noise sources associated with the existing facility include concrete batch processing equipment, idling trucks, truck washing equipment, and the on-site parking area. Operations at the Bender Ready-Mix facility occur within a heavily industrialized area with a similar range of uses. Intervening uses between the project site and the nearest sensitive receptor (multi-family residential uses to the west) include concrete block walls and the Union Pacific railroad alignment. Moreover, existing operations at the facility comply with Chapter 18, Article VI (Noise Control) of the City's Municipal Code. Thus, existing operations at the facility do not result in significant stationary operational noise impacts. I JULY 2011 4.12-7 NOISE 31A-81