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7,71 "3. <br /> MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST <br /> 11. NOISE <br /> Table 5.11-2 TRAFFIC NOISE LEVELS ALONG ROADWAYS IN THE PROJECT SITE VICINITY <br /> Noise Level,dBA,Ldn <br /> 2035 Plus <br /> Existing Incremental Approved 2035 Plus Incremental Incremental Cumulatively <br /> Existing plus Project Increase Significant? Projects Project Increase Significant? Increase Considerable? <br /> Roadway Segmenta.e A B B-A Yes or Na C D) (D-A) (Yes or No), (D-C) (Yes or No)c <br /> Mountain House Parkway 60.4 67.0 6.6 Yes 70.9 71.0 10.6 Yes 0.1 No <br /> south of Byron Road <br /> Mountain House Parkway 64.3 67.2 3.0 No 69.9 69.9 5.7 Yes 0.1 No <br /> south of Grant Line Road <br /> Bryon Road east of Mountain 64.5 67.0 2.5 No 71.4 71.4 6.9 Yes 0.0 No <br /> House Parkway <br /> Bryon Road west of Mountain 63.9 65.1 1.1 No 68.4 68.3 4.3 No -0.2 No <br /> House Parkway <br /> Grant Line Road east of 58.9 59.3 0.4 No 67.5 67.6 8.7 Yes 0.1 No <br /> Mountain House Parkway <br /> Grant Line Road west of 60.6 61.0 0.5 No 67.6 67.8 7.2 Yes 0.2 No <br /> Mountain House Parkway <br /> Great Valley Parkway north of nlad nlad Nad nlad 58.7 58.2 nlad No -0.5 No <br /> Grant Line Road <br /> Great Valley Parkway south 52.0 56.1 4.1 No 61.0 60.9 8.9 Yes -0.1 No <br /> of Grant Line Road <br /> a Road center to receptor distance is 30 meters(approximately 100 feet)for values shown in this table.Noise levels were calculated using the FHWA Traffic Noise Prediction Model(FHWA RD-77- <br /> 108). <br /> b Vehicle mix on based on actual percentages observed during short-term measurements.The speed for these segments was assumed to be 45 miles per hour for all segments except Great Valley <br /> Parkway which has a speed limit of 35 miles per hour. <br /> Considered significant if the incremental increase in noise is greater than 5 dB.Ldn as defined in the Master Plan. <br /> d Not applicable. <br /> Source:ESA,2011. <br /> (9mi1) 5-141 <br />