07-28-1999 Council Agenda - Laserfiche WebLink

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NEIGHBORHOOD MEETING MINUTES Maple Leaf Court Drainage Corrections July 13, 1999 — 6:00 p.m. A meeting was held at 3112 Maple Leaf Court with the following people in attendance: Sandra Peterson — 3118 Maple Leaf Court John & Dolores Knoche — 3112 Maple Leaf Court Mr. & Mrs. David Kysylyczyn — 3102 Maple Leaf Court Mr. & Mrs. Brad Notenberg — 3080 Maple Leaf Court Richard Swanson —1010 County Road D East Terry Maurer, City Engineer Greg Schroeder, Public Works Director Joel Hanson, City Administrator The purpose of this meeting was to review the corrective actions necessary to eliminate severe erosion existing in a portion of the Maple Leaf Court area. A notice of the meeting was sent out by the City Engineer (see copy of notice and mailing list attached). The City Engineer reviewed the options available to address the erosion problem existing in their rear yard drainage swale. Those options are as follows: 1. Install new storm sewer pipe in boulevard of Maple Leaf Court. The concerns with this approach are its high expense, the disruption to the street and front yard area, conflicts with existing utilities, and the need to still make corrective actions in the rear yard areas. 2. Place a storm sewer pipe in the rear yard drainage swale. The concern with this approach is that the pipe cannot be constructed while ensuring stability due to the poor soils within this area. The peat in existence is subject to a great deal of movement Imbedding the pipe would be extremely difficult. 3. Install aponding system in this area. The problem with this approach is that the area impacted is too large and would eliminate the use of rear yards. 4. Line the existing swale with enkamat - riprap. This was deemed to be the most effective option proposed. The existing erosion would be filled in. Banks in the most severe areas would be riprapped with an underlining fiber mat (enkamat). This lining is a three - dimensional fiber mesh that will hold seeds and soil. The fiber does not deteriorate, but can be maintained by mowing of the grasses established within it. It adds substantial stability to the topsoil area. The enkamat lining would be used in the lower velocity areas with the riprap used in the areas where flow is of higher volume. The City Engineer stated his biggest concern with option #4 is access to the area. He is proposing to construct a ramp off County Road D to provide direct access to the rear yard areas He noted restoration of the disturbed areas would be by seeding, as sod will not hold up given the instability of soils during heavy rainfall events. A question was asked if work can be done Page 139