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Draft Supplemental Environmental Impact Report Page IV.0-12 Forward Inc.Landfill 2018 Expansion Project Table IV.0-4 EXISTING AND PROJECTED TRAFFIC NOISE LEVELS ALONG ROADWAYS IN THE PROJECT VICINITY(Lo„) Change' Change' Chang' Change' 2036' Change' Change6 Existing+ Existing Existing Existing Cum NP 2036'Cum 2036'Cum Cumulative + +Project +Project from +Project +Project Existing+ (near term) Existing Project + +Cum 2036' Existing 2036' from from Existing Cumulative from + from Cumulative from (Cum (No Cum+ 2036' Existing Roadway Segment 2018 (near term) Existing Project Existing (near term) Existing NP) Project) Project (Cum NP) No Project Austin Rd,S of Arch Rd' 70.1 70.2 0.1 73.4 3_4 73.5 3_4 72.7 2.7 74.9 2.2 4.9 Arch Rd,W of Austin Rd2 68.6 68.7 0.1 71.8 3_3 71.9 3_3 72.7 4_2 74.3 1.6 5_8 Austin,N of project driveway' 69.1 69.3 0.1 73.0 3_9 73.1 4.0 69.8 0.7 73.5 3_6 4_3 Austin,S of project driveway^ 67.7 67.8 0.2 71.4 3_7 71.5 3.8 68.6 0.9 71.8 3.2 4.2 French Camp,W of Austin Rd5 69.7 70.1 0.4 72.0 2.3 72.3 2.5 1 72.2 2.5 73.7 1.5 4.0 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. 'There 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. 'Some"Change"calculations appear to be off by 0.1 dB,this is due to rounding,the calculations are correct based on model calculations to hundredths. '2035 cumulative traffic was used to model 2036 cumulative traffic noise levels in this Supplemental EIR. 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(FICON,1992). Other Notes:Noise levels in this table were calculated using the FHWA Traffic Noise Prediction Model 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 Austin Road,45 mph on Arch Road,and 55 mph on French Camp Road.Vehicle mix varies,it is assumed that existing landfill heavy truck trips equal approximately 60%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 PHA Transportation Consultants. 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).