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or after 9:00 p.m. on any day. This would essentially restrict construction activities to <br />these hours, thereby avoiding construction noise during nighttime hours when people <br />would be most sensitive to noise. However, daytime noise could potentially exceed <br />County noise standards at nearby residences. Mitigation described below would reduce <br />noise generated by construction equipment to a level that would be less than significant. <br />TABLE 3-5 <br />CONSTRUCTION EQUIPMENT NOISE LEVELS <br />Maximum Level <br />Type of Equipment (dBA at 50 feet) <br />Auger Drill Rig <br />84 <br />Backhoe <br />78 <br />Compactor <br />83 <br />Compressor (air) <br />78 <br />Concrete Saw <br />90 <br />Dozer <br />82 <br />Dump Truck <br />76 <br />Excavator <br />81 <br />Generator <br />81 <br />Jackhammer <br />89 <br />Paver <br />77 <br />Pneumatic Tools <br />85 <br />Source: FHWA 2006. <br />As the project site is currently vacant, the project would be expected to increase the <br />ambient noise level in the area once construction work is completed. Project operations <br />would generate noise primarily from vehicle traffic to and from the project site. The <br />increased noise resulting from project traffic could adversely affect existing residences <br />along Pock Lane that are near the project site. <br />Noise levels in the vicinity of the project site were estimated using the Highway Noise <br />Model, developed by the Federal Highway Administration with input from Caltrans. <br />Appendix F contains the results of the modeling run. Using the existing noise data for <br />Pock Lane, which does not cover the entire road, and the estimated daily traffic generated <br />by the project, traffic on Pock Lane with the project would generate noise levels ranging <br />from 62.1 to 62.9 dB at 50 feet from centerline. The 65 -dB noise contour would extend <br />from 20 to 25 feet from centerline. Since the residences along Pock Lane are greater than <br />25 feet from the road centerline, the estimated noise levels at these residences would be <br />below the County noise standard for outdoor activity areas. As such, noise impacts from <br />project traffic would be less than significant. <br />The project site is in an area with limited development, so few land uses are expected to <br />be affected by the change in ambient noise. Moreover, the proposed project is a <br />Pock Lane Public Review Draft IS/MND 3-54 May 2022 <br />