4H, Rice Creek Watershed District Cost Share Agreement - 2011 PMP

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� EN HILLS MEM4RANDUM DATE: June 27, 2011 TO: Honorable Mayor and City Council Members Patrick Klaers, City Administrator FROM: Krisiine Giga, Civil Engineer SUBJECT: Rice Creek Watershed District Cost Share Agreement for the 20ll Pavement Management Program Back�round/Dis cussion In March, staff applied for funding from the Rice Cree� Watershed District (RCWD) thra�gh its 2011 Urban Stozmwater Remediatian Cost-Share Program. This funding is avazlable to assist m�aicipalities located within the RCWD to incorparate water quality improvement Best Management Practices (BMPs} into redevelopment, roadway and storm sewer irnprovement projects in 2011. Only storm water improvements that are not part of a RCWD perrnit requirement are eligible far this f�nding. The RCWD Board reviewed the City's application and appraved this project for funding at iheir May 25 Board meeting. A copy of the cost-share agreement is included in this packet. The Ciiy At�orney reviewed the agreement and did not have anq commenis. Improvements are proposed in two areas that woi�td be eligible for cost-share dollars. The first is the canstruction of an EcoSiorm structure, or grit chamber, on Nizrsery Hill Lane. This will allow for suspended solids to settle out in the structure prior ta storm water discharging to Karth Lake. In the existing storm sewer system, pre-treated wa#cr that has filtered tl�rough wetlands mi�es with nFnoff directly from the street prior io dischaxging to K�rth Lake. The proposed system will separate the pre-treated water from the street runoff. New pipe wi�l be constructed ihat will allow the pre-treated water to be diverted directly to the lalce, whil� the street runoff w-ill be direcied to the EcaSiarm structure for treatment, prior to discharging into Karth Lalce. The second i�nprovement is th.e construction of an outlet conirol siructure in the wetland on ihe north side of Nursery Hiil Court. The existing outlat is a 12" pipe that easi�y clogs witY� leaves and debris, restricting ihe flow leaving the vvetland. With the outlet coni�ol structure, the flow will still leave the wetland via a pipe. The outiet controI structure vvili be constructed in a method that, during srnall storm events, wiIl detain water in the wetland a little longer than it does in existing conditions, �vhich will allow for improved City Council Meeting IlMetro-inet.uslardenhi�lslPR&PW1EngineeringlCouncil Actions12Q1116-27-11Mema RCWDCostShare 2011.doc Page I of 2