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M M mm mom W m M Table A-6: Estimated Noise Levels at Nearest Residential Property Line Due to Expanded Transfer Station Activities Res P.Line dBA-Inc. Distance Distance attenuation to Ind to Res Ind P.Line Res P.Line for distance Source of Reference Property Property dBA-Inc. dBA-Inc. plus 15 dBA Noise Level Measurement distance Line Line attenuation attenuation reduction in noise Noise-Generating Source/Activity jHourly Leo) Data feet feet feet for distance for distance for tub grinder Greenwaste processing activities 93 1 75 75 900 93 71 56 (Tub grinder and bucket loader) General TS Operations(through exit door) 75 2 50 NA 500 NA 55 55 Truck Activity at the Site 56 3 50 NA 400 NA 38 38 (collection,transfer,roll-off trucks,etc.) TOTAL: 72 59 --absent benefit of 6-foot wall. 5 dBA reduction w/6-foot wall. - 9 dBA reduction w/10-foot wall. 1. Noise measurements were made by Environmental Science Associates of greewaste processing activities at Acme Fill Landfill in Martinez,California,on October 7, 1999. Operating equipment included a bucket loader and tub grinder. 2. Representative noise measurement data was taken from the South San Francisco Scavenger Company Materials Recovery Facility and Transfer Station Draft EIR,published October 28, 1998(see p. III.G-7). The noise measurement at was taken 50 feet from the exit door of the transfer station and was measured during a peak activity period. 3. The hourly Leq for truck activity at the transfer station was based on a measured SEL value recorded by ESA of a heavy duty truck passby at the Visalia Home Depot on July 7, 1999. At this location,an SEL value of 86.7 dBA was measured for a truck passby event that lasted 35 seconds. This data is similar to noise measurement data taken from the Sanitary Fill Company Recycling and Solid Waste Systems Plan Draft EIR,published February 24, 1995(see pp.A.101 and A.104),where no SEL values were recorded. The formula for determining the hourly Leq from truck activity at the expanded transfer station is: Leq(h)-SEL ref+Cn-35.6,where Cn= 10 LOG (Number of truck trips/20). Based on the number of net new truck trips that would occur over a day(214 trips),an average of 16 trips would occur during each operating hour. To determine the worst case hourly Leq,the number of truck trips that would occur during the a.m.peak hour(63 trips)was used to estimate the hourly Leq. This method of calculating the hourly Leq was derived from the Federal Transit Administration's Transit Noise and Vibration Impact Assessment published in April 1995.