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11 1111St <br /> CONSULTING ENGINEERS <br /> April 18, 1994 <br /> File: 230-179-11 <br /> Mr. Steve Ach <br /> City Planner <br /> City of Elk River <br /> 13065 Orono Parkway <br /> CMI ENGINEERING: Elk River, MN 55330 <br /> ENVIRONMENTAL RE: DICKENSON BUS GARAGE SITE PLAN REVIEW <br /> MUNICIPAL Dear Mr. Ach: <br /> PLANNING 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 /> •�iRUCTURAI <br /> 1. The information we reviewed included a Grading and Drainage Plan and a Site Plan, <br /> SURVEYING 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 /> TRAFFIC we received and reviewed a set of drainage calculations prepared by John Oliver and <br /> Associates. <br /> TRANSPORTATION <br /> 2. The Drainage Plan for this site shows two ponds, Pond A at the northerly end and <br /> Pond 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 /> 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 /> 1326 Energy Park Drive depth with a normal pool elevation. We would recommend that the Drainage Plan <br /> St.Paul,MN 55108 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 /> 612-644-4389 assist with the settling out of material contained within the runoff. <br /> Fax:612-644-9446 <br /> 3. The outlet from Pond B at the southern portion of the property needs some type of <br /> 000 Shelard Parkway erosion protection. <br /> Minneapolis,MN 55441 <br /> 612-546-0432 <br /> Fax:612-544-6398 <br />