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<br /> <br /> <br /> engineering planning environmental construction 701 Xenia Avenue South <br /> Suite 300 <br /> Minneapolis, MN 55416 <br /> Tel: 763-541-4800 <br /> Fax: 763-541-1700 <br />Memorandum <br /> <br /> <br />To: Phil Belfiori, Administrator – RCWD <br /> Kyle Axtell, Water Resources Specialist – RCWD <br /> <br />From: Todd Hubmer, PE – WSB & Associates, Inc. <br /> <br />CC: Mark Casey, City Manager – SAV <br /> Jay Hartman, Director of Public Works – SAV <br /> Justin Messner, PE – WSB & Associates, Inc. <br /> <br />Date: February 20, 2015 <br /> <br />Re: Mirror Pond Project <br /> City of St. Anthony, MN <br /> WSB Project No. 1626-79 <br /> <br /> <br />This memorandum is provided to support the proposed water quality and flood improvements to <br />Mirror Pond in St. Anthony Village. <br /> <br />Existing Conditions of Mirror Pond <br /> <br />Mirror Pond is a constructed storm water basin that is approximately 9.4 acres, at its existing <br />Normal Water Level (NWL) of 920.86 feet, and is located within the Cities of St. Anthony <br />Village and New Brighton. The pond is entirely owned by the City of St. Anthony Village. A <br />high-pressured gas line currently extends north to south along the west side of the pond. <br /> <br />Project Goals <br /> <br />The following is a list of design considerations for the Mirror Pond Project: <br /> <br />1. Provide a NURP Dead Pool volume, which is equal to or greater than the runoff from a <br />2.5 inch rain fall event (approximately 32 acre-feet). <br />2. Improve pollutant removals of Mirror Pond and reduce nutrient transport downstream to <br />Long Lake. <br />3. Reduce downstream local flooding by: <br />a. Providing 1.0 foot freeboard for the TP-40 100-year flood event (6.0 inch – 24 hour <br />event). <br />b. Allowing no overtopping in Atlas -14 flood event (7.38 inch – 24 hour event). <br /> <br /> <br />Equal Opportunity Employer <br /> wsbeng.com K:\01626 -790\Admin\Docs\Final\MEMO-Mirror Pond-022015.docx