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09/15/2014COMMITTEE OF THE WHOLE – Minutes of Meeting September 15, 2014 The Village Board met as a Committee of the Whole in the Council Chambers of the Village Hall at 7:00 p.m. on Monday, September 15, 2014. In attendance were: PRESENT: Village Board Staff Harriet Rosenthal, Mayor Kent Street, Village Manager Robert Benton, Trustee Andrew Lichterman, Asst. to the Village Manager Alan Farkas, Trustee David Fitzgerald, Management Analyst Thomas Jester, Trustee Barbara Little, Director of PW and Engineering William Seiden, Trustee Robert Phillips, Asst. Director of PW and Eng. Barbara Struthers, Trustee Eric Oscarson, Asst. to the Director of PW Eric Burk, Finance Director John Sliozis, Police Chief ABSENT: Robert Nadler, Trustee Public Comment None on non-agenda items Presentation of North Trail Subdivision Drainage Study by Daniel Creaney Company Director of Public Works and Engineering Barbara Little introduced the team from Daniel Creaney Company to present the results of their North Trail Subdivision Drainage Study. Present were President Daniel Creaney, Project Manager Robert Hansen and Project Engineer Mark Toll. Mr. Creaney outlined the history of the flooding situation in the North Trail Subdivision that resulted in the Village retaining his company’s services. He noted that when the subdivision was constructed in the 1960s the current building and drainage regulations were not in place, and that items not considered at that time are now having an impact on flooding. A lot of water is funneled through the subdivision to get to the Middle Fork of the North Branch. He noted that following heavy storms, water will pond on the road to the level where it becomes impassable. Mr. Creaney noted that he and his staff met with the Village Public Works Department, the North Trail Homeowners Association and individual homeowners in addition to conducting field surveys. This information was used to create a computer model and test simulations to find ways to remediate flooding. He reported the model found two ways to reduce storm water ponding. He noted that both options would require significant re-grading of the land, including several private properties. He also noted that the study recommends two methods to reduce roadway flooding. These include Page 3 C.O.W – September 15, 2014 construction of a relief storm sewer and lowering the overflow route in the area between the subdivision and Deerfield High School. He stated that the most direct relief option is the relief storm sewer as it would both reduce ponding and reduce the duration of ponding. Mayor Rosenthal asked Mr. Creaney to explain the concept of the relief sewer. He stated the relief storm sewer would provide additional capacity to take the water to the river. He clarified that the relief storm sewer does not include the addition of water storage, as there is not enough space in the area to increase storage. Trustee Jester inquired what level storm-event the system was built for and what is considered an acceptable duration for ponding. Mr. Creaney stated the current system was built for a 10-year, 24-hour storm. He noted that the problem with ponding in the area isn’t just its duration, but also that the water’s depth can reach 18” in some areas, making the roads impassable. Trustee Jester asked if it would be more cost effective to pay employees to bring water pumps to the area following short-duration, high-intensity storms to relieve ponding. Mr. Creaney stated that residents in the subdivision report the problem being too widespread. Mayor Rosenthal inquired about the total cost to implement all recommendations in the report. Mr. Creaney noted it would be $825,000 for the storm drainage work. Trustee Jester noted that this figure does not include the associated road construction and underground utility work that would need to take place along with the storm sewer recommendations. Resident Andi Kenney, 1700 Mountain Court, thanked the Village for its work up to this point and urged the Board to move forward with the Creaney recommendation. She asked the Board to also consider the impact of future developments and using rain gardens and other natural improvements to supplement the recommendations. She also requested the Board make sure that any work in the area does not move the problem to a different part of the subdivision. Resident Mark Samuels, 975 Mountain Drive, stated that storms since the one in 2013 have flooded basements and caused other damage that had not been seen previously. Mr. Creaney stated that rain gardens can help mitigate flooding, but noted that most soils in this area are clay, which tends not to be effective for rain gardens. Trustee Farkas inquired if it is possible to divert or block some of the inflow. Mr. Creaney stated that it would be difficult to accomplish and would require relief sewer. Mayor Rosenthal thanked Mr. Creaney and his team for their presentation and for their work completing a thorough drainage study. Adjournment Trustee Farkas made a motion to adjourn. The motion was seconded by Trustee Struthers. The meeting adjourned at 7:30 p.m. Page 3 C.O.W – September 15, 2014 Respectfully submitted, David Fitzgerald, Management Analyst