i-271 noise abatement explanation
TRANSCRIPT
An Explanation of the Information Provided on the Display Boards
Impacted Receptor – A receptor (home) is considered to be impacted by traffic noise if the predicted design year noise level is 66 dBA or greater. Benefited Receptor – A receptor is considered to be benefited by the construction of a noise barrier if the receptor receives a 5 dB or greater reduction in noise level. A receptor may be benefited by a noise barrier even though it may not be impacted by project noise levels. Most display boards have the following Legend: The leader (shown below) points to a particular noise receptor(s). The receptor is identified (1-1) and the level of noise reduction provided for the receptor is identified (5.1 dB). A noise barrier wall will be recommended for construction as part of the project if the barrier meets both of the following criteria: Feasible – A noise barrier wall is considered a feasible noise abatement measure if the barrier is able to provide a noise reduction of at least 7 dB for at least one noise receptor site. Reasonable - A noise barrier wall is considered a reasonable noise abatement measure if the total cost of the barrier is less than $35,000 per benefited receptor. The typical noise barrier will cost $25 per square foot. How to determine if a noise barrier is cost reasonable: - The length of the noise barrier is multiplied by the average height of the noise barrier and multiplied by the cost per square foot to determine the total cost of the noise barrier. The total cost of the noise barrier is then divided by the number of benefited receptors. If the cost of the noise barrier is less than $35,000 per benefited receptor, a noise barrier is considered reasonable. A noise barrier wall must be both feasible and reasonable to be recommended for construction. A noise barrier wall must also be desired by the receptors that are benefited by the barrier. If you benefited by a noise barrier, it is important to vote your preference for construction or not to construct.
Receptor Noise Reduction (dB)
A green box indicates a receptor that is impacted by the traffic noise and is benefited by the noise barrier wall.
Receptor Noise Reduction (dB)
A yellow box indicates a receptor that is not impacted by the traffic noise but is still benefited by the noise barrier wall.
An orange box indicates a receptor that is not impacted by the traffic noise and is not benefited by the noise barrier wall.
A red box indicates a receptor that is impacted by the traffic noise and is not benefited by the noise barrier wall.
Receptor Noise Reduction (dB)
Receptor Noise Reduction (dB)
NSA 9 - Noise Analysis CUY-271-0.00 PID 80418
Receptor Site Existing Noise Level Noise Level with Construction
Legend
Noise Summary NSA 9
Noise Impact Occurs at 66 dBA No Noise Impact - Noise Abatement Not Evaluated
9-1 63.9 dBA 64.6 dBA
9-3 61.6 dBA 62.2 dBA
9-2 64.9 dBA 65.5 dBA
10-1 61.9 dBA 62.5 dBA
10-2 62.8 dBA 63.1 dBA
10-5 63.4 dBA 63.7 dBA
10-6 64.5 dBA 64.9 dBA
10-7 64.6 dBA 65.0 dBA
10-3 63.6 dBA 63.9 dBA
10-4 64.3 dBA 64.7 dBA
Receptor Site Existing Noise Level Noise Level with Construction
Legend
NSA 10 - Noise Analysis CUY-271-0.00 PID 80418
Noise Summary NSA 10
Noise Impact Occurs at 66 dBA No Noise Impact - Noise Abatement Not Evaluated
Receptor Site Existing Noise Level Noise Level with Construction
Legend
NSA 13 - Noise Analysis CUY-271-0.00 PID 80418
13-1 61.5 dBA 62.7 dBA
13-4 & 5 63.5dBA 64.7 dBA
13-7 59.9 dBA 61.4 dBA
13-6 65.4 dBA 65.7 dBA
13-3 60.3 dBA 61.9 dBA
13-2 60.9 dBA 62.4 dBA
Noise Summary NSA 13
Noise Impact Occurs at 66 dBA No Noise Impact - Noise Abatement Not Evaluated
1-1 (8) 5.9 dB
1-2 (8) 6.5 dB
1-3 (6) 5.5 dB
1-4 (6) 5.3 dB
1-5 2.2 dB
1-6 (6) 4.6 dB
Receptor Noise reduction ( dB)
Receptor Noise reduction ( dB)
Receptor Noise reduction ( dB)
Receptor Noise reduction ( dB)
Impacted/Benefitted
Not Impacted/Benefitted
Not Impacted/Not Benefitted
Impacted/Not Benefitted
NSA 1 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
Barrier Summary NSA 1
1,220’L x 13.7’H x $25 = $416,080 Benefitted Receptors = 34
$15,675/Benefitted Receptor Feasible / Reasonable
Recommended Noise Barrier
Receptor Noise reduction ( dB)
Receptor Noise reduction ( dB)
Receptor Noise reduction ( dB)
Receptor Noise reduction ( dB)
Impacted/Benefitted
Not Impacted/Benefitted
Not Impacted/Not Benefitted
Impacted/Not Benefitted
3-11 3.5 dB
3-12 2.3 dB
3-3 4.9 dB
3-2 0.3 dB
3-1 0.3 dB
3-4 5.6 dB
3-5 5.9 dB
3-6 6.9 dB
3-7 6.9 dB
3-8 6.7 dB
3-10 5.6 dB
3-9 6.5 dB
NSA 3 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
Barrier Summary NSA 3
1,222’L x 25’H x $25 = $763,480 Benefitted Receptors = 8
$95,435/Benefitted Receptor Not Feasible / Not Reasonable
Noise Barrier Not Recommended
Receptor Noise reduction (dB)
Receptor Noise reduction (dB)
Receptor Noise reduction (dB)
Receptor Noise reduction (dB)
Impacted/Benefitted
Not Impacted/Benefitted
Not Impacted/Not Benefitted
Impacted/Not Benefitted
NSA 4 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
4-1 4.5 dB
4-5 4.9 dB
4-4 4.9 dB
4-3 4.9 dB
4-2 4.6 dB
4-6 5.0 dB
4-7 8.2 dB
4-8 5.6 dB
4-12 3.3 dB
4-9 5.7 dB
4-10 5.0 dB
4-11 4.5 dB
Barrier Summary NSA 4
1,234’L x 17.8 ’H x $25 = $555,300 Benefitted Receptors = 11
$50,481/Benefitted Receptor Feasible / Not Reasonable
Noise Barrier Not Recommended
5-1 (2) 6.5 dB
5-2 (3) 6.1 dB
5-4 (4) 4.9 dB
5-3 (4) 6.3 dB
5-5 (4) 4.5 dB
5-6 (4) 6.8 dB
5-7 (4) 6.9 dB
5-8 (4) 6.1 dB
5-9 (3) 8.4 dB
5-10 (3) 8.4 dB
5-11 (4) 2.5 dB
5-12 (4) 2.8 dB
NSA 5 - Noise Barrier Analysis CUY-271-0.00 PID 80418
Barrier Summary NSA 5
2,560’L x 14.9’H x $25 = $950,769
Benefitted Receptors = 34 $27,963/Benefitted Receptor
Feasible / Reasonable
Recommended Noise Barrier
NSA 6 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
Barrier Summary NSA 6
980 L x 14.1 ’H x $25 = $352,693 Benefitted Receptors = 16
$22,043/Benefitted Receptor Feasible / Reasonable
6-6 6.7 dB
6-1 7.3 dB
6-2 (2) 5.8 dB
6-8 6.3 dB
6-9 (2) 4.5 dB
6-10 (2) 4.5 dB
Recommended Noise Barrier
6-3 6.7 dB
6-4 (2) 6.5 dB
6-5 4.5 dB
6-7 (2) 6.0 dB
6-11 3.9 dB
6-12 (1) 8.8 dB
6-13 2.7 dB
Recommended Noise Barrier
NSA 7 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
Barrier Summary NSA 7
1,040’ L x 12 ’H x $25 = $313,534 Benefitted Receptors = 27
$11,612/Benefitted Receptor Feasible / Reasonable
7-4 (3) 5.7 dB
7-3 (3) 5.2 dB
7-2 (2) 1.9 dB
7-1 (5) 6.4 dB
7-5 (4) 8.4 dB
7-7 (3) 7.7 dB
7-9 (3) 6.3 dB
7-10 (3) 5.4 dB
7-8 (3) 5.7 dB
7-6 (2) 3.3 dB
7-11 (2) 2.7 dB
Recommended Noise Barrier
8-14 (3) 3.8 dB
8-3 (2) 8.9 dB
8-15 (4) 2.8 dB
8-4 (4) 10.5 dB
8-5 (4) 8.3 dB
8-6 (4) 9.1 dB
8-7 (4) 9.3 dB
8-8 (4) 8.2 dB
8-9 (4) 8.4 dB
8-16 (4) 2.2 dB
8-17 (4) 3.7 dB
8-18 (4) 3.7 dB
8-19 (4) 3.8 dB
NSA 8 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
8-2 (3) 4.5 dB
8-1 (2) 4.9 dB
8-45 2.5 dB
This Figure – 32 Benefitted Receptors
Recommended Noise Barrier
8-10 (4) 8.8 dB
8-11 (4) 7.1 dB
8-12 (4) 5.5 dB
8-13 (3) 3.3 dB
8-20 (4) 3.4 dB
8-21 (4) 2.8 dB
8-22 (3) 2.6 dB
8-23 (1) 1.7 dB
8-24 (2) 1.1 dB
8-25 (3) 3.6 dB
8-26 (4) 4.8 dB
8-27 (4) 5.5 dB
8-28 (4) 7.4 dB
8-35 (2) 1.0 dB
8-36 (4) 2.0 dB
8-37 (4) 1.6 dB
8-38 (4) 1.7 dB
8-39 (4) 2.5 dB
NSA 8- Noise Barrier Analysis CUY-271-0.00 PID 80418
This Figure – 24 Benefitted Receptors
Recommended Noise Barrier
NSA 8 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
8-29 (3) 8.7 dB
8-30 (4) 9.2 dB
8-32 (4) 6.1 dB
8-31 (4) 5.1 dB
8-33 (3) 5.2 dB
8-34 (3) 2.6 dB
8-40 (3) 3.4 dB
8-41 (3) 3.4 dB
8-42 (3) 2.6 dB
8-43 (3) 1.7 dB
8-44 (3) 2.6 dB
Barrier Summary NSA 6 and Short Section NSA 8
6,070’ L x 13.9’ H x $25 = $2,112,714 Benefitted Receptors = 74
$28,550/Benefitted Receptor Feasible / Reasonable
This Figure - 18 Benefitted Receptors
Recommended Noise Barrier
NSA 11 & 12 - Noise Barrier Analysis
CUY-271-0.00 PID 80418
12-2 3.4
12-1 5.8 dB
11-8 4.0 dB
11-2 3.5 dB
11-1 5.3 dB
11-4 2.8 dB
11-3 2.6 dB
11-5 2.6 dB
11-7 4.3 dB
11-6 3.9 dB
11-11 3.1
11-9 4.4 dB
Barrier Summary NSA 11
873’ L x 19.2 ’H x $25= $419,040
Benefitted Receptors=1 $419,771/Benefitted Receptor Feasible / Not Reasonable
Barrier Summary NSA 11
1,181’ L x 20 ’H x $25 = $590,500
No Benefitted Receptors Not Feasible
Barrier Summary NSA 12
485’ L x 20 ’H x $25 = $242,415 Benefitted Receptors = 1
$242,415/Benefitted Receptor Feasible / Not Reasonable