2. AGENDA 09-19-1994 - Laserfiche WebLink

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~ MS CONSULTING ENGlNEEIl!l ovn E,'\jG,r,~EER,'NG ~NVIRONlvIENTAt hWN,ICWA[ PIAN,\JING STRUCTURAl . SURVEYING TRAFF!C TRANSPORTAT,'ON 1326 Energy Park Drive St. Paul, MN 55108 612.644-4389 Fax: 612.644-9446 . 9800 Shelor<! Parkway Minneapolis, MN 55441 612.546.0432 Fax: 612.544-6398 September 13, 1994 File: 230-223-20 Mr. Pat Klaers City Administrator City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330 RE: WESTERN AREA DRAINAGE PLAN Dear Mr. Klaers: As you are aware, there have been some questions raised about the design of the trunk storm sewer system along Orono Parkway. This system is the primary means of storm drainage for the existing and proposed developments both north and south of Orono Parkway. Construction of the trunk storm sewer is part of the Western Area Phase II Improvements contract. During the past several weeks, we have been working with Jon Bogart, P.E., of John Oliver & Associates to both clarify our design intentions and to reach an agreement on drainage of future developments in the Western Area. This process is now complete. We offer this correspondence as a summary of the agreed-upon drainage plan for the Western Area. DRAINAGE AREAS The drainage plan includes areas from the City Hall property, Country Crossing First, Second and Third Additions south of Orono Parkway, Sandpiper Estates, Orono Third Addition, and also a portion of the properties north of Orono Parkway (see Exhibit). A hydrograph of each area was generated with the TR-20 computer program. Table I shows the internal peak flow generated from each area. Table 1. Peak Discharges for Each Area DRAINAGE AREA PEAK DISCHARGE 40 101* Commercial Develo ment 49 4 29 18* First Northeast 223-1303 . BOp Pagel