07-14-14 Special WS - Laserfiche WebLink

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ARDEN HILLS SPECIAL CITY COUNCIL WORK SESSION – JULY 14, 2014 4 Public Works Director Maurer indicated that he was the City’s representative for the TCAAP infrastructure study and commented that the City was paying for a portion of the study (sanitary sewer, water and storm drainage). He reported that the Army was responsible for groundwater and the County was responsible for wetlands. He indicated that the City would be involved in the design of the stormwater system and would have maintenance responsibilities after the system was constructed. Mr. Horn reported that his goal was to design a stormwater system that meets the needs of the development area. Once the requirements are understood and the design is created, the next step would be to create a feasibility report. Then the expense and cost sharing for the project would need to be further evaluated. Mayor Grant asked if the size of the stormwater facility was driven by the amount of impervious surface that would be created by development. Mr. Horn stated that existing and proposed conditions impacted the size of a stormwater facility along with what was necessary to bridge the gap. Councilmember Holden discussed the stormwater ditch that runs adjacent to the spine road. She asked if there was a cost difference between a full-length ditch versus ponds. Mr. Horn explained that ponds would require excavation and the ditches would require pipes. Further discussion ensued regarding ditches versus ponds along the spine road. Ms. Engum commented that the Council would need to consider if the ponds would have water standing in them at all times, and if this water needed to be circulated or treated to maintain a proper level of water quality. Councilmember McClung asked if the majority of the stormwater from the TCAAP site would drain through the green spine to Rice Creek. Ms. Kunkel discussed how water currently flowed through the site noting the majority would flow to Rice Creek. Mayor Grant recommended that the Council discuss what they would like to see on the TCAAP site. He noted that based on comments expressed to date, the Council wants water in the ponds at all times and that the ponds be free of algae or stagnant water. He felt that the stormwater treatment ponds would be considered an amenity. Councilmember McClung stated that his ideal vision was similar to that of Centennial Lakes. He understood that the City may not be able to create something to the same extent, but hoped to have three or four larger bodies of water that were connected through a meandering brook that flowed into the Rice Creek system. This would turn the stormwater treatment system into an amenity rather than a system of ditches. He wanted this development to be differentiated from other sites.