2009-06-23_PWETC_Minutes - Laserfiche WebLink

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Impact analysis results of the area north of Highway 36 show the current levels for night time range from 58 to 67 decibels and the projected levels range from 59 to 67 decibels. The standard level is 55 decibels. The current levels for daytime range from 65 to 68 decibels and the projected levels range from 65 to 69 decibels. The standard level is 65 decibels. Since these levels exceed the standards, a Mitigation Assessment is necessary. In the Mitigation Assessment, noise barriers were modeled. On the north side of Highway 36, west of Rice Street a 20 foot high wall would meet the MnDOT Reasonability Criteria. 41 residents would receive a 5 decibel reduction or greater. Local communities are given the opportunity to approve proposed noise walls. Noise walls that meet the cost effectiveness criteria but are not approved by the local government are not constructed. A municipal resolution is needed for or against noise barrier along the north side of Highway 36. Notices have been sent out to residents to get feedback on the proposed noise wall. Member DeBenedet asked what the cost is of the proposed noise wall. Duane Schwartz answered noise walls cost generally about $1,500,000.00 per mile. This wall will be about a half mile so the cost would be about $750,000.00. The project as a whole does not have funding yet. Member Vanderwall asked if the City Council approves this now but in a couple years once the final plans are ready, can the City Council back out of it. Duane Schwartz stated he did not have an answer for this. Member DeBenedet stated it was possible for the City Council to back out of the decision. Member Vanderwall mentioned the type of material on the roadway makes a difference with noise too. Asphalt is much less noisy than concrete so if that changes the noise level will change. Duane Schwartz showed pictures of what the Highway 36 /Rice Street Bridge will look like and landscaping drawings. Member DeBenedet asked if all the drawings that were shown are alternative looks to choose from or are they different views of the same thing. Member Stenlund answered they are different views of they same bridge. Member DeBenedet asked if a sign could be added to the bridge with "Welcome to Roseville" on it. Duane Schwartz answered there are federal highway regulations that prohibit wording on the bridge. Arose shape or leaves could be added however. 7. 2010 Public Works Budget Overview Page 5 of 7