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, ., . , . Mr. Tom O'Keefe. P.E. December 7, 1999 Page 3 Comments to Guide MnlDOT Durin�the Final Design Phase 1. Sewer trunk line replacement. As part of the new Highway 12 construction proj ect,Mn/DOT will remove and replace City and MCES sewer lines that are currently located in the railroad right-of-way. These lines will be replaced by a line or lines that meet the current and projected sewer capacity needs of both Orono and Long Lake. 2. Stormwater management. The City of Long Lake has requested Mn/DOT to study options for diverting a portion of the stormwater runoff to a pond adjacent to the sewer property in Long Lake, rather than directing the flow into Long Lake. The purpose is to reduce the potential for flooding, and to improve the water quality of Long Lake. At the March 3, 1999 Highway 12 Design Review Committee meeting,Nancy Yew, Mn/DOT Water Resources staff, acknowledged there was an"unknown"risk of deteriorated water quality coming out of the pond adjacent • to the sewer property in Long Lake if the proposed stormwater diversion plan was adopted. Nancy indicated a more comprehensive study would have to be done to better quantify this risk. Although the City is supportive of improving the water quality of Long Lake,it is not supportive of doing so at the expense of the viability of wetlands along Long Lake Creek and of the long-term water quality of Lake Minnetonka. It is imperative that prior to any decision regarding the diversion option,substantial analysis is conducted to determine water quality impacts. 3. Conidor lighting. Mn/DOT has indicated lighting along the corridor will be limited to the bridge and interchange areas. Lighting will be added along the corridor only if an accident problem develops that is specifically caused by, and can be ameliorated by,the addition of lighting. If this situation occurs,Mn/DOT will work with the affected cities to develop a lighting plan that addresses the accident problem while minimizing the amount and height of lighting. It � is important that Mn/DOT is flexible in its lighting design so that Mn/DOT can work with the cities to minimize the height of the lighting, so that the spillover of light from the roadway to adjacent properties is minimized. 4. Vibration and noise mitigation. The City has contracted with HDR Engineering to conduct a study of noise and vibration • impacts along the highway/railroad corridor. It is important that Mn/DOT make optimal