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TABLE 4.6.3 SUMMARY OF 15 -MINUTE AMBIENT NOISE MEASUREMENTS AUGUST 16, 1993 1. 40 feet from MacArthur centerline opposite Teichert 1:35 pm 63 77 62 59 56 Gravel 2. 80 feet from MacArthur centerline near mobile homes 2:05 pm 55 68 55 48 46 3. 50 feet from MacArthur centerline at Lorraine 2:25 pm 60 73 63 51 46 L'e The average A -weighted noise level during the measurement period. q. 2. The A-weighted'noise levels that are exceeded during the measurement period 01, 10, 50, and 90 percent of the time, respectively. Measurement Location 1 was 40 feet from the centerline of MacArthur Road south of the entrance to Teichert Gravel at the edge of an orchard. Crushing and screening operations at the gravel plant generated typical noise levels ranging from 55-60 dBA. Trucks passing the measurement location generated typical maximum noise levels of about 80 dBA. Location 2 was further south at a location opposite the two mobile homes about 80 feet from the centerline of the roadway. The noise of the gravel operations was 45-50 dBA. Gravel trucks passing during the measurements generated maximum noise levels of up to 73 dBA. General aviation aircraft were audible during the noise measurement and generated typical maximum noise levels ranging from 55-60 dBA. Location 3 was selected to represent the noise environment at residences along MacArthur Boulevard north of Linne Road. The site was about 50 feet west of MacArthur Drive at its intersection with Palmquist Avenue. Automobile traffic and truck traffic on MacArthur Drive were the dominant noise sources. Automobiles generated typical maximum noise levels ranging from 60-65 dBA. Truck traffic generated maximum noise levels of up to 77 dBA. The noise monitoring demonstrated that vehicular traffic is the dominant noise source at sensitive receptors in the area. The existing 24-hour average Community Noise Equivalent Level (CNEL) resulting from traffic can be calculated from traffic counts which were generated by the traffic consultant for this project (Korve Engineers). Traffic noise levels are calculated using the Federal Highway Administration (FHWA) transportation noise model, FHWA RD -77-108. Using this model, the existing CNEL at the mobile homes is calculated to be 56 dB. The existing CNEL at the houses north of Linne is calculated to be 63 dB 50 feet from the centerline of MacArthur Drive. These calculations correlate well with the measured noise levels. ENVIRONMENTAL IMPACTS AND MITIGATION MEASURES In this section the potential long-term noise impacts resulting from operation of the TMRF and the short- term impacts during construction of the facility are assessed. Mitigation measures are evaluated for significant impacts which are identified. ER -93-1 - 79 - (9-27-93)