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A. This section applies to arterial and state highway improvement projects in residential zones (Class A EDNA).

B. In residential zones (Class A EDNA), arterial and state highway improvement projects, not including the addition of walkways, bicycle lanes and minor widening (such as turn lanes), must include a noise analysis of the affected environment by a qualified noise consultant if:

1. The existing or projected noise level exceeds 67 dBA peak noise hour Leq; or

2. The projected exterior noise level as a result of the project is estimated to increase beyond 67 dBA peak noise hour Leq; or

3. The exterior noise level is expected to increase by five dBA or more as a result of the project.

C. The point of exterior noise level measurement for purposes of this section will be five feet above existing grade anywhere along a parallel line 60 feet on either side of the arterial centerline.

D. Noise mitigation measures intended to reduce exterior noise levels to 67 dBA peak noise hour Leq or lower shall be determined by the Technical Committee. Measures such as location, design, setbacks, earthen berms, landscaping and berm/wall barriers shall be used instead of tall, linear, blank walls. Use of noise walls shall be limited or avoided if other feasible measures are available. If noise walls are determined to be necessary, they shall be located to maximize effectiveness and designed to avoid a long, linear, blank appearance. Noise walls shall be limited to the lowest effective height, combined with earthen berms where feasible, screened by landscaping, modulated, and constructed with durable and decorative materials. If additional funding is necessary, the Technical Committee shall make a recommendation to the City Council. The criteria for evaluating noise mitigation measures are:

1. Whether reasonable noise mitigation measures are available which will reduce exterior noise levels by five dBA or more; and

2. Whether the financial impacts of noise mitigation measures are not disproportionate to the overall cost of the arterial improvement project; and

3. Whether benefited property owners contribute to the cost of mitigation; provided, that this factor only applies if existing exterior noise levels exceed 67 dBA peak noise hour Leq; and

4. Whether the benefited community is supportive of noise mitigation measures. (Ord. 2590 § 2 (part), 2011).