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Hydraulic Excavators 81 to 90 86 <br />Graders 79 to 89 86 <br />Air Compressors 76 to 86 66 <br />Trucks 81 to 87 86 <br />Construction is performed in discrete steps, each of which has <br />its own mix of equipment, and, consequently, its own noise <br />characteristics. These various sequential phases would change <br />the character of the noise generated on the site and, therefore, <br />the noise levels surrounding the site as construction <br />progresses. Table N-4 identifies estimated noise levels for the <br />different construction phases of the project. To obtain a worst- <br />case estimate of noise from the different construction <br />activities associated with the proposed project, noise levels <br />for construction activities were assumed to include applicable <br />construction equipment identified in Table N-5. <br />Table N-5 <br />Typical Noise Level at Construction Sites <br /> Minimum Equipment All Applicable <br /> Required equipment In Use <br />Construction Phase Noise Level (dBA) at Noise Level (dBA) at <br /> 50-Feet 50-Feet <br />Ground Clearing 84 84 <br />Excavation 79 89 <br />Foundation 78 78 <br />Construction <br />Building Construction 76 85 <br />Finishing/Site cleanup 76 89 <br />As shown on Table N-5, noise levels under a worst-case condition <br />with all applicable equipment in use would produce 89 dBA at a <br />distance of 50-feet from excavation as well as from finishing <br />and site clean up activities. Assuming that the average distance <br />of the construction activities from adjacent land uses is 50- <br />feet from the center of the construction activities, noise <br />levels at the property would range from 78 to 89 dBA. <br />The project site is located north of an existing athletic field <br />of a school site. Typically the school site and the athletic <br />field of school site would be considered a sensitive noise <br />receptor. The athletic field would be impacted by potentially <br />significant short-term construction related noise impacts. <br />The Municipal Code recognizes that some forms of noise are <br />required for urban development and maintenance and are difficult <br />to control. Section 18-314 (e) exempts noise sources associated <br />25 32~,~9 <br />