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r In the composting area the major noise source would be the use of a front loader which generates an hourly average noise level of about 65 dBA at a distance of 250 feet. The grinding area would have noise levels generated by the grinder and a dozer. The hourly average noise level, based on measurements at another site, is estimated to be 73 dBA at a distance of 250 feet (Wood Recycling Products, Berkeley, CA, Environmental Noise Assessment prepared by Illingworth and Rodkin, Inc., 1989). Noise levels from these activity areas were summed and projected out to the nearest sensitive area, the two mobile homes located about 600 feet to the north of the project. The project would be located in a pit where the ground elevation is about 40 feet below the north and east property line elevations. This was calculated to provide an additional 6 dB of shielding over that provided by the intervening distance. The predicted total hourly average noise level at the nearest sensitive receptor is 52 dBA. This is below the existing noise level and would not result in any significant noise impact. Mitigation 4.6-1 No mitigation is required or recommended. Impact 4.6-2 Project -generated traffic would not result in a substantial increase in noise levels at sensitive receptors along MacArthur Drive or other streets in the area and would not result in any significant noise impacts. The proposed project would result in an increase in vehicular traffic on the streets in the area. The main access road is proposed to be MacArthur Drive. Employees at the site and individual users would increase automobile and light truck traffic along MacArthur Drive. Transfer trucks and garbage truck deliveries would increase heavy truck traffic on MacArthur Drive. Future traffic noise levels are calculated based on traffic data supplied by the traffic consultant (Korve Engineers). Project traffic is calculated to increase noise levels less than 1 dBA during the peak hour and a 24-hour Ldn basis. Maximum noise levels would be similar to existing maximum noise levels generated by gravel trucks on the roadway. There would therefore not be a perceptible change in the character of the noise or the level of noise along the street network. The noise level increase would not be substantial and the resulting noise impacts would be less than significant. Mitigation 4.6-2 No mitigation is required or recommended. Impact 4.6-3 Construction activities associated with the proposed project would result in temporary Increases In noise levels In surrounding areas. The noise level increases would not be substantial and no significant noise impacts would result from the construction of the proposed project. Construction activities required for the proposed project would include some grading, the construction of foundations, concrete work associated with the MRF/Transfer Station, building erection, equipment installation, and paving and finishing of roadways. Noise levels associated with the equipment that would be used on this project would be similar to the operational noise levels previously discussed. The noise reduction resulting from the distance between the site and the nearest sensitive receptors and the shielding provided by the pit in which the project would be located would reduce noise levels to below the existing ambient noise. Construction ER -93-1 -81 - (9-27-93)