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<br />1.0 Project Scope and Description
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<br />SEH has been asked to perform an environmental noise analysis along Highway 10 between
<br />1-694 and County Road 96. This analysis is being performed to gauge the effectiveness of
<br />potential noise barriers.
<br />
<br />This environmental noise analysis is being performed according to Federal Highway
<br />Administration (FHW A), Mn/DOT, and MPCA guidelines with regards to noise in and
<br />around proposed neighborhoods affected by increased traffic levels in their existing
<br />condition, and those modeled for 2030.
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<br />1.1 State and Federal Noise Abatement Criteria
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<br />The methods used are in accordance with State and Federal mandated noise simulation
<br />methods and on-site measurement. Specifically, the MINNOISE model was used as a basis
<br />for identifying potential noise impacts along the Highway 10 corridor and at residential
<br />locations along the east shore of Round Lake, and also at 3 additional homes east of Highway
<br />10. The modeled sites include areas of existing residential housing and common use areas
<br />regarded by the Federal standards as Federal Activity Category B. For reference, FHW A
<br />Noise Abatement Criteria is listed in Figure 2.
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<br />
<br />Fig. 2, Federal Noise Abatement Criteria ("'Highway Trallie Noise Analysis and Abatement Policy and Guid~U1cc" US Dcpt. or
<br />Transportation, June 1995),
<br />
<br />In accordance with FHW A requirements, Mn/DOT has adopted a statewide noise policy that
<br />clarifies the FHW A terminologies of noise impacts. "Mn/DOT Noise Policy for Type I and
<br />Type II Federal-aid Projects as per 23 CFR 772" includes the following descriptions:
<br />
<br />Noise Level Approaching the NAC; MnJDOT defines a level as "approaching" the criterion
<br />level when it is I dBA, or less, below the criterion level. For example, 69 dBA is considered
<br />"approaching" the FI-IW A NAC category B level of 70 dBA.
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<br />Substantial Increase in Noise; The receptors shall have predicted future noise levels which
<br />exceed the levels in Figure 2 or exceed existing noise levels by 5 dBA or more.
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<br />Substantial Noise Reduction; Mn/DOT identifies feasibility requirements for the use of
<br />abatement procedures such as noise barriers and their associated costs. These requirements
<br />
<br />Noise Barrier Anaiysis
<br />Highway 10
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