08-25-2004 Council Agenda - Laserfiche WebLink

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UMW g- .fSSO(I41TtS August 20, 2004 Honorable Mayor and City Council City of Little Canada 515 Little Canada Road East Little Canada, MN 55117 -1633 RE: ROUND LAKE TOWNHOMES RETAINING WALLS Dear Mayor and Council Members: TAUT: hO M As requested we have reviewed the topographic survey and wall site plan. The plan was prepared by Advance Surveying & Engineering Company. Based upon our review we would have the following comments. 1. The maximum wall heights shown on the plans indicate that no walls we be constructed over 4 -feet high. Therefore, it is not required that the walls be designed by an engineer or that any fence be placed on the walls. In talking to Ms. Beverly Hoffman, it is our understanding that the retaining walls will be constructed of boulders and will be installed by a professional contractor. 2. The space between two tiered walls must be atleast as wide as the height of the tallest wall. Based on scaling of the plan it appears that in areas where two walls are utilized there will be a minimum of 4 -feet between the walls which willId meet this requirement. 3. To prevent sediment into the Round Lake, silt fence should be installed on the lake side of each wall construction area. The silt fence should be placed outside the construction area terminate at a point that is higher in elevation than any disturbed area. The silt fence should be inspected after each rain event and sediment removed as necessary. 4. Due to the location of the disturbance we feel restoration should occur within 1- week of each wall being completed. Erosion blanket should be used on any slopes over 3:1 (H:V). These are our comment based on the review of the submitted documents. If you have any questions please feel free to call. Sincerely, Elfering & Associates Lee Elfering, P.E. cc: Joel Hanson, City Administrator Beverly Hoffman, 29 Round Lake Trail C: \windows \TEMP \Ltr - 082004 -CC (Retaing Wall Plan Review).doc