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Page 3 kimley-horn.com 2550 University Avenue West, Suite 238N, St. Paul, MN 55114 651 645 4197 ·Based on final tower design assumptions determined above, run analysis of a second alternate trunk water main layout to address potential construction sequencing We will also evaluate, model and refine the pump hydraulics and requirements. Modeling results will be documented in a short technical memorandum and modeling files will be archived with the City. Water Tower and Booster Station Final Design Cost:$15,000 Lift Station Final Design It has been determined that a lift station is required to meet the sanitary sewer needs of the TCAAP redevelopment area. The final design of a lift station was not included in Agreement PW2014-24. The proposed lift station design will utilize a duplex submersible pump system with variable frequency drives (VFD) in order to allow for greater flexibility in adjusting the capacity of the lift station as the development is phased out. Based on our Technical Memorandum, dated November 20, 2014, the average flow used for design of the lift station will be 500 gpm with a peaking factor of 3.3. The pump size will be selected to handle the peak full developed flow with only one pump operating and the second pump serving as a back-up. The proposed lift station will also be backed up with an on-site generator. The peak flow anticipated for the design of the lift station is 1600 gpm or 3.6 cfs. The proposed lift station will be located along the US Highway 10/I-35W right-of-way. The lift station wet well will be 12 feet in diameter with a separate meter/valve vault. Kimley-Horn will review the MPCA permitting requirements for lift station design and confirm assumptions. Kimley-Horn will work with Electric Pump as the supplier of the Flygt Pumps that the City of Arden Hills is requesting. Kimley-Horn will investigate the use of a flush valve with the selected pumps. Variable frequency drive (VFD) pumps will be considered which can accommodate varying sanitary sewer flows. Dual force mains will be design to accommodate varying sanitary sewer flows. Septicity will need to be addressed during initial low flows as development is occurring. Casing pipes for these dual force mains have been installed under Rice Creek with the Rice Creek Remeander project and the receiving sanitary sewer manhole will be installed as a part of the County Road H interchange project. Kimley-Horn will prepare design and construction documents for a new lift station using City of Arden Hills utility design standards. Our services will include the following: · Coordination with Ramsey County, Arden Hills and the regulatory/permitting agencies · Calculations and design of the proposed lift station (electrical, mechanical, & structural) · Prepare construction drawings for the lift station including structure and foundation details, site grading, access road, electrical and telemetry design, drainage and landscaping, piping and equipment details, and electrical and instrumentation design · Prepare a detailed engineer’s opinion of probable construction cost · Furnish sets of construction drawings and specifications in such quantities as may be required by Ramsey County and Arden Hills for submission to State regulatory agencies and other review authorities