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f 7-1 i _ 1. r l ! U .. _l ♦ w,Y a 1' _ .J Draft Environmental Impact Report Page IV.0-14 Forward Inc. Landfill Expansion Table IV.0-4 EXISTING AND PROJECTED LDN TRAFFIC NOISE LEVELS ALONG ROADWAYS IN THE PROJECT VICINITY Existing(2009) Year 2035 Change Change Change Existing Existing Existing 2035 Change + +Project +Project 2035 Cum NP Change 2035+Prof Existing Sig. Project + +Cum (Cum Sig. from 2035+Prof from Existing + Criteria from Cumulative from No Criteria Existing 2035+ from Existing Roadway Segment No Pro Pro'ect dBA Existing near term Existing Pro dBA NP Pro'ect 2035 NP NP Austin Road,north of Mariposa Road 64.1 65.6 3.0 '1.5 65.7 1.6 73.7 1.5 9.6 73.9 0.20 9.6 Austin Road,north of Arch Road 63.9 65.4 3.0 1.5 66.1 2.2 75.1 1.5 11.2 75.2 0.10 11.3 Austin Road,south of Arch Road 67.0 69.3 1.5 2.3 71.2 4.2 72.5 1.5 5.5 73.3 0.80 6.3 Arch Road west of Austin Road 65.5 67.4 1.5 1.9 69.5 4.0 73.0 1.5 7.5 73.4 0.40 7.9 Austin Road north of Project driveway 67.3 69.4 1.5 2.1 71.2 3.9 70.1 1.5 2.8 71.3 1.20 4.0 Austin Road south of Project driveway 64.5 66.5 3.0 2.0 69.5 5.0 68.9 1.5 4.4 69.7 0.80 5.2 Austin Road north of French Camp 64.0 66.2 3.0 2.2 69.3 5.3 64.6 3.0 0.6 66.6 2.00 2.6 French Camp west of Austin Road 65.2 66.4 1.5 1.2 68.4 3.2 69.0 1.5 3.8 69.5 NA NA Significance Criteria Ambient conditions less than 60 dBA=5.0 dBA or more Ambient conditions between 60 and 65 dBA= 3.0 dBA or more Ambient conditions greater than 65 dBA=1.5 dBA or more Notes Noise levels were calculated using the FHWA TNM LookUp Model Program,Software version 2.1. Noise levels were calculated for 50 feet from the roadway centerline.The analysis assumes the average vehicle speed to be 50 mph on all roads,except Arch and French Camp, which are assumed to 45 mph.Vehicle mix varies,it is assumed that existing landfill heavy truck trips equal approximately 140%of project heavy truck trips;existing and cumulative medium trucks are assumed to be 2%of total vehicle mix. The noise analysis relies upon a.m.peak hour traffic levels from the Forward Landfill Traffic Impact Analysis(Republic ITS,2009) Noise values in the table are peak hour Leq values calculated from a.m.peak hour traffic volumes. The values are shown as Ldn values for comparison with 24-hour noise metrics because the rule of thumb is that the Ldn is within+/-2 dBA of the peak hour Leg under normal traffic conditions(Caltrans,Technical Norse Supplement, 1998). Bold numbers represent significant increases in noise levels.