11-28-2016 Council Packet - Laserfiche WebLink

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Final Plat Application 16-3860 Kintyre Preserve Page 2 1.6 Record drawings must be submitted upon completion of the project. As -built survey shots on the pond must be obtained after construction sediment is removed and side slopes re -dressed. 2.0 STORMWATER MANAGEMENT PLAN: 2.1 A final Stormwater Management Plan matching improvements proposed must be submitted to verify plan meets all requirements. Per City requirements, proposed peak runoff rates for the 2, 10, and 100 year 24 hour precipitation events must be restricted to less than existing peak rates for the same events. Per NPDES requirements, any project that results in 1 acre or more new impervious surface at ultimate development must provide volume retention equal to I" runoff from the new impervious surfaces. All stormwater management facilities should be designed to accommodate ultimate development. 2.2 Per NPDES requirements, the proposed pond must provide 1,800 cf storage below the outlet for each acre draining to it. Calculations confirming sizing should be submitted. 2.3 The sump should be removed from the pond outlet control structure. The inlet pipe should flow backward to pond to allow for future maintenance. The proposed weir will control the normal water level. 3.0 FINAL PLAT: 3.1 Horizontal curves for streets with a design speed of 30 mph must provide a minimum 275' radius. Several curves within Outlot B do not meet the minimum requirement. The Plat should either be revised or variances would be required. 3.2 Drainage and Utility easements should be provided to cover all stormwater management facilities (i.e. storm sewer, swales, ditches, and ponds). Easements should be shown on Final Grading and Utility Plans in order to verify coverage. Easements may need to be adjusted in order to accommodate revisions necessary to gain City approval. 3.3 Standard Wetland Conservation and Flowage Easements should be provided over all wetlands. The Final Plat should indicate Drainage Easements only over wetlands and wetland buffers. 4.0 FINAL SITE PLAN: 4.1 The new driveway to Lot 5 should be installed at the same time Kintyre Lane is constructed, and the existing driveway should be removed. The new driveway location should be indicated on the plans. 4.2 Removal items not depicted on the other plans should be noted for demolition on this overall plan. These items include the construction access driveway, the portion of driveway removed that use to serve Lot 5, and various structures to be demolished. 5.0 FINAL GRADING PLAN: 5.1 The grading necessary to remove the existing driveway to Lot 5 should be indicated on the plan. Any existing culvert present should be removed, and the drainage way should be restored to pre - development conditions. 5.2 The swale alignment between Kintyre Lane and the pond should be revised as necessary to minimize impact to Wetland #3. A minimum 10' wide berm should be provided between the wetland edge and swale to minimize potential for changing wetland hydrology.