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<br />" <br /> <br />MS, <br /> <br />l- <br />i <br />COXSULmG &~G1XEERS <br /> <br />CIVIL ENGINEERING: <br /> <br />ENVIRONMENTAl <br /> <br />MUNICIPAl <br /> <br />PlANNING <br /> <br />STRUCTURAl <br /> <br />SURVEYING <br /> <br />TRAFFIC <br /> <br />TRANSPORTATION <br /> <br />1326 Energy Park Drive <br />Sf. Paul, MN 55108 <br />612-644-4389 <br />Fox: 612-644-9446 <br /> <br />9800 Shelard Parkway <br />Minneapolis, MN 55441 <br />512- 546-0432 <br />:ox: 612-544-6398 <br /> <br />-, <br /> <br />") <br /> <br />. <br /> <br />Apri118, 1994 <br />File: 230-179-11 <br /> <br />Mr. Steve Ach <br />City Planner <br />City of Elk River <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />RE: DICKENSON BUS GARAGE SITE PLAN REVIEW <br /> <br />Dear Mr. Ach: <br /> <br />As requested, we have reviewed the submittal package for the Dickenson Bus Garage site. <br />Based on our review, we would offer the following comments: <br /> <br />1. <br /> <br />. <br /> <br />The information we reviewed included a Grading and Drainage Plan and a Site Plan, <br />both prepared by John Oliver and Associates; a Building Elevation Plan and a <br />Landscaping Plan, both of those prepared by Douglas A. Moe Architects, Inc. Also, <br />we received and reviewed a set of drainage calculations prepared by John Oliver and <br />Associates. <br /> <br />..~ <br /> <br />2. <br /> <br />The Drainage Plan for this site shows two ponds, Pond A at the northerly end and <br />l;'ond B at the southerly end of the site. The site is approximately divided in half with <br />the northerly portion flowing to Pond A and the remainder of the site flowing to <br />Pond B. Both ponds are relatively shallow and would most likely be dry ponds. It <br />is difficult to determine for sure since no soil borings were submitted. <br /> <br />It would be much better to provide a greater depth of ponds to allow for greater <br />opportunity for settling of ,.materials out of the runoff. According to Best <br />Management Practices, these types of ponds are recommended to be 4 to 10 feet in <br />depth with a normal pool elevation. We would recommend that the Drainage Plan <br />for this site be reanalyzed in an effort to meet the requirements of Best Management <br />Practices by increasing the depths of the ponds to include a normal pool elevation to <br />assist with the settling out of material contained within the runoff. <br /> <br />3. <br /> <br />The outlet from Pond B at the southern portion of the property needs some type of <br />erosion protection. <br /> <br />. <br />