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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES D. NOISE IMPACT STATEMENTS AND MITIGATION MEASURES Impact D.1: Construction associated with the proposed expansion of the Stockton Scavenger Transfer Station would temporarily and intermittently increase noise levels at nearby sensitive receptor locations. (Significant) Construction activity noise levels at and near the project site would fluctuate depending on the particular type, number,and duration of uses of various pieces of construction equipment. Construction-related material haul trips would raise ambient noise levels along haul routes, depending on the number of haul trips made and types of vehicles used. Table III.D-3shows typical noise levels during different construction stages. Table IIID-4 shows typical noise levels produced by various types of construction equipment. TABLE III.D-3 TYPICAL CONSTRUCTION NOISE LEVELS Construction Phase Noise Level(dBA,Leq)a Ground Clearing 84 Excavation 89 Foundations 78 Erection 85 Finishing 89 a Average noise levels correspond to a distance of 50 feet from the noisiest piece of equipment associated with a given phase of construction and 200 feet from the rest of the equipment associated with that phase. SOURCE: Bolt, Baranek, and Newman, Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances, 1971. Construction of the proposed project would generate significant amounts of noise corresponding to the appropriate phase of building construction and the noise generating equipment used during those phases. The closest sensitive receptors would be the residences located west of the site across Temple Street and users of the Trinity Community Church. The 3.6-acre area west of Pershing Avenue would continue to be used for the storage of roll-off containers. With the exception of paving the ground surface,no other major construction activities are planned for this portion of the project site. Some construction would occur in association with the proposed cul- de-sacs on Faye Street and Pershing Avenue. Residences along Temple Street could be located as close as 50 feet from these activities. However,the majority of project construction would occur on the area of the site east of Pershing Avenue, roughly 400 feet from residences. Project construction is expected to occur over a three to four month period. Noise from construction activities generally attenuates at a rate of 6 to 7.5 dBA per doubling of distance. Residences along Temple Street could experience noise levels up to 89 Leq during cul-de-sac construction and paving activities. Assuming an attenuation rate of 6 dBA per doubling of distance, these residences would experience noise levels of up to 71 Leg during construction on the eastern portion of the site. Construction noise at these levels would be substantially greater Stockton Scavenger Transfer Station Erpansion III.D.11 ESA/990190