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ARDEN HILLS CITY COUNCIL WORK SESSION—DECEMBER 20, 2010 8 Mayor Harpstead spoke in favor of Alternative 4. He added that there may be an opportunity to work with Roseville for regional money. Councilmember Grant also favored Alternative 4 and added that he likes the trail option which makes it one more trail section closer to the County Road E bridge and would bring people from South of County Road E into Arden Hills. - Public Works Director Maurer agreed that building the trail on Old Snelling makes sense. Alternative 4 includes the trail and is MSA funding eligible. Councilmember Holden stated she wants to look at other needs before she chooses one of the Alternatives presented this evening. Councilmember Grant stated there are alternatives that make sense and added that it's going to fall on the City since there are so few properties to assess. MOTION: Councilmember Holmes moved and Councilmember Grant seconded the motion to recess the worksession at 6:55 p.m. The motion carried unanimously (5.0). Mayor Harpstead reconvened the worksession at 7.32 p.m. 2.13 Valentine Park Drainage Analysis Review Public Works Director Maurer explained that in February 2009, WSB prepared the Valentine Park Drainage Analysis to better understand the options available for investment in the park given the periodic flooding from Valentine Lake. At that time, neighborhood concerns led the Council to direct Staff to have another consultant review the analysis and render a professional opinion regarding its conclusions. Bolton. & Menk, Inc. (BMI) reviewed the WSB analysis, and in their November 2, 2010, letter summarized their findings, BMI found that the inputs into the drainage model are accurate and the conclusions in the WSB report appear to be appropriate. They do question the Normal Water Level (NWL) in the WSB report of 875.5 versus the Ordinary High Water Level (OHWL) they received from the DNR of 878.8 BMI also suggests the drainage model be rerun after a determination is made regarding which is the appropriate elevation so the City will have an accurate representation of a storm event. Public Works Director Maurer stated that staff also had Roseville's surveyor determine the lowest opening on the homes adjacent to the park. The lowest opening was determined to be a walk-out patio door at elevation 883.9. BMI's review determined that the DNR's highest recorded lake level is 881.1. Industry standards would have the lowest opening elevation a minimum of 2 feet above the highest flood elevation. The above information indicates that there is 2.8 feet between the highest flood elevation and the lowest opening. This would indicate that filling of the park to raise improvements out of flood danger should have no adverse effects on adjacent properties if proper drainage is included in the design.