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r r I r r r i i r + i i + i r r r r r Draft Supplemental Environmental Impact Report Page IV.C10 Forward Inc.Landfill 2014 Expansion Project Table IV.0-4 EXISTING AND PROJECTED TRAFFIC NOISE LEVELS ALONG ROADWAYS IN THE PROJECT VICINITY (L-) Change Change Change Change Existing Existing Existing 20316 20316 Cum + +Project +Project Cum NP +Proj Change Existing Existing Project + +Cum 20316 from 20316 from 20316 Cum+Proj 2012 + from Cumulative from (Cum Existing Cum+ 2035(Cum from Roadway Segment No Pro') Project Existing near term Existin NP No Pro' Project NP Existing No Pro' Austin Road,south of Arch Road' 67.3 71.6 4_4 72.9 5_6 72.7 5_5 74.5 1.7 7_2 Arch Road west of Austin Road2 66.6 70.4 3_7 71.7 5_0 73.7 7_0 74.7 1.0 8_1 Austin Road north of Project driveway3 67.3 71.7 4_3 71.7 4_3 70.2 2.8 72.9 2.7 5_5 Austin Road south of Project driveway° 68.8 73.2 4_4 73.2 4_4 70.9 2.2 74.1 3_2 5_3 French Camp west of Austin Roads 68.9 72.5 3.6 72.5 3.6 71.1 2.2 73.5 2.4 4.6 Bold and Underlined numbers in the table represent significant increases in noise levels. 'There are four residences along the east side of Austin Road:one is 1,800 feet south of Arch Road and approximately 70 feet from the centerline of Austin Road with an outdoor activity area approximately 25 feet from the road centerline;two are 0.8 mile south of Arch Road and approximately 70 feet and 120 feet from the centerline of Austin Road with outdoor activity areas approximately 25 feet from the road centerline;the other residence is 0.9 mile south of Arch Road and approximately 90 feet from the centerline of Austin Road with an outdoor activity area approximately 50 feet from the road centerline. ZThere are two residences along the south side of Arch Road:one is approximately 200 feet west of Newcastle Road at approximately 65 feet from the road centerline with an outdoor activity area approximately 30 feet from the road centerline;the other is at the intersection with Fite Court at approximately 120 feet from the road centerline with an outdoor activity area approximately 40 feet from the road centerline. 3There is one residence along the east side of Austin Road north of the Project driveway. This residence is just north of the Project driveway and is approximately 80 feet from the road centerline with an outdoor activity area approximately 30 feet from the road centerline. "There are three residences along the east side of Austin Road,south of the Project driveway:one is approximately 1.1 miles south of the driveway at approximately 100 feet from the road centerline with an outdoor activity area approximately 30 feet from the road centerline;the other residences are approximately 1.2 miles south of the driveway at approximately 300 feet and 530 feet from the road centerline with outdoor activity areas approximately 250 feet and 500 feet from the road centerline. 'There are several residences along French Camp Road,west of Austin Road,the closest of which are approximately 200 feet to the west of Austin Road. One of these residences is on the north side of the road at approximately 100 feet from the road centerline with an outdoor activity area approximately 30 feet from the road centerline. Two others are on the south side of the road at distances of 115 feet and 190 feet from the road centerline with outdoor activity areas approximately 85 feet from the road centerline. 6Cumulative 2035 traffic was used as 2031 cumulative traffic to model noise levels in this Supplemental EIR as a conservative estimate. Significance criteria:5.0 dBA or more if ambient conditions are less than 65 dBA,Ldn,and 3.0 dBA or more if ambient conditions are greater than 65 dBA,Ldn. Other Notes Noise levels in this table were calculated for approximately 50 feet from the roadway centerline. As noted above,some of the outdoor activity areas of nearby residences are as close as 25 feet from the road centerline and some of the residences are well over 100 feet from the road 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 52%of the project increase in 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,2012). Noise values in the table are a.m. peak-hour Leq values. The values are shown as Ldn values for comparison with 24-hour noise metrics because the general rule is that the Ldn is within+/-2 dBA of the peak hour Leq under normal traffic conditions(Caltrans, Technical Noise Supplement, 1998).