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<br />B. Exposure of persons to or generation of excessive <br />groundborne vibration or groundborne noise levels. <br /> <br />Potentially Significant Unless Mitigation Incorporated <br /> <br />Construction operations associated with the proposed project <br />would increase existing noise levels within the project area. <br />Noise generated during construction is a function of <br />construction equipment used, the location of the equipment, <br />and the timing and duration of the noise-generating <br />activities. Construction of the proposed project is <br />anticipated to commence October 2005 with an estimated <br />duration of 3-6 months. Construction noise levels reported <br />in Noise from Construction Equipment and Operations, Building <br />Equipment, and Home Appliances, (United States Environmental <br />Protection Agency (EPA), 1971) were used to estimate future <br />construction noise levels for the proposed project. <br />Typically, the estimated construction noise level is governed <br />primarily by the highest noise producing pieces of equipment. <br />Table N-6 presents typical noise levels generated at varying <br />distances from project construction sites during various <br />construction phases and under minimum and maximum equipment <br />usage scenarios. Table N-6 presents noise levels for the <br />various construction phases. The nearest noise sensitive use <br />is the condominium complex 61 feet to the south of the project <br />site. <br /> <br />Noise Levels at <br /> <br />Table N-6 <br />Project Construction <br />Minimum Required <br />Equipment in Use1 <br />(50 feet from Project <br /> <br />Sites (dBA Leq) <br />All Applicable <br />Equipment in Use1 <br />ConstruCtion) <br /> <br />Construction Phase <br /> <br />Reference Noise Levels <br /> <br />Ground 84 84 <br />Clearing/Demolition <br />Excavation 79 89 <br />Foundation 78 78 <br />Construction <br />Building 76 85 <br />Construction <br />Finishing and Site 76 89 <br />Cleanup <br /> <br />Noise Levels at Condominiums (61 feet South from Project <br />Construction) <br /> <br />Ground 82 82 <br />Clearing/Demolition <br />Excavation 77 87 <br />Foundation 76 76 <br /> <br />29 <br /> <br />31A-62 <br />34 of 85 <br />