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• r . Howarc R. Green Company May 21, 2002 File: 817660J-0240 Mr. Chris Leeseberg City of Elk River 13065 Orono Parkway PO Box 490 Elk River, MN 55330-0490 RE: ECHO HILL ADDITION Dear Mr. Leeseberg: As requested, we have reviewed the submittal package for the proposed Echo Hill Addition. The information we received was prepared by Bogart Pederson & Associates, Inc., and dated March 14, 2002. It contained a preliminary plat, preliminary grading and erosion control plan, preliminary landscape and lighting plan, and a 1992 aerial photo. In addition, drainage calculations were submitted for the proposed development. We also received a revised grading plan, undated, in late April. Based on our review and comments received at the staff review meeting, we would offer the following comments: • 1. The entrance road off of Proctor Avenue is a relatively steep grade exceeding 9%. The City Ordinance for public streets requires a maximum grade of 8%. However, in this circumstance, there would be a devastating effect on the wooded area adjacent to the road. If the road needs to be cut down to meet the maximum 8% grade contained in the ordinance, the grading limits will expand north and south, dictating the removal of a significant number of trees. 2. Lot 5, Block 1, has an existing home and an additional building on the site. The additional building is shown to be removed. The location of the septic system for the existing home on Lot 5, Block 1, should be noted on the plan to be sure that it falls within the newly created building lot. 3. The revised grading plan shows the house pad on each lot set back from the street at a location where a reasonable driveway can be constructed. It will be important that the development plan indicates these are the approved home locations and styles relative to floor elevations. 4. At the staff review meeting, the comment was made that perhaps a requirement of this plat should be to build the septic site prior to home construction, in an effort to minimize the removal and disruption of trees. If the septic site is built first, access to that site could be accomplished through the home building site. 5. Storm runoff from the street is collected in the cul-de-sac and at the intersection with Proctor Avenue and conveyed to natural low areas with no outlet. The inlet and storm sewer system from the cul-de- sac will be down a very steep grade. It will be difficult to maintain that grade after the trees are removed. Detail needs'to be provided as to how this slope will be maintained during and after construction. The same is true for both storm sewer systems at the outlet. The velocity of the water will be very great and a detail will need to be provided concerning erosion protection methods at the • outlets. Ltr-052102-Leeseberg.doc 1326 Energy Park Drive • St. Paul, MN 55108 • 651/644-4389 fax 651/644-9446 toll free 888/368-4389