I-271 Noise Abatement Explanation

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.


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.



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


Legend


Noise Summary NSA 10



Legend


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


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)




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





Impacted/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


CUY-271-0.00 PID 80418


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)




Impacted/Benefitted





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


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


2,560’L x 14.9’H x $25 = $950,769

Benefitted Receptors = 34 $27,963/Benefitted Receptor

Feasible / Reasonable



CUY-271-0.00 PID 80418


980 L x 14.1 ’H x $25 = $352,693 Benefitted Receptors = 16


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


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



CUY-271-0.00 PID 80418


1,040’ L x 12 ’H x $25 = $313,534 Benefitted Receptors = 27


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


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


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


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



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


This Figure - 18 Benefitted Receptors


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


873’ L x 19.2 ’H x $25= $419,040

Benefitted Receptors=1 $419,771/Benefitted Receptor Feasible / Not Reasonable


1,181’ L x 20 ’H x $25 = $590,500

No Benefitted Receptors Not Feasible


485’ L x 20 ’H x $25 = $242,415 Benefitted Receptors = 1

$242,415/Benefitted Receptor Feasible / Not Reasonable

Date post:	12-Feb-2017
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I-271 Noise Abatement Explanation

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