03/12/2014 P&Z Packet - Laserfiche WebLink

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Easements Standard drainage and utility easements will be required around the interior perimeter of the lots. A drainage and utility easement a minimum of 10 feet beyond the storm water management basin's 100-year storm high water level elevation and 10 feet around the wetland boundary will also be required. Storm Water Management and Erosion and Sediment Control Soil borings were completed by Mattke Surveying & Engineering, Inc. to determine the depth of the water table. MW Water Table Boring # Ground Elevation Depth to Water Table Elevation B-1 902.05 feet 5.9 feet 896.15 feet B-2 903.56 feet 7.5 feet 896.06 feet The lowest floor elevation of new homes needs to be constructed 4 feet above the water table. The proposed lowest floor elevation is 902.0 which provides a minimum 6 feet of separation. A ponding area will be constructed in the rear yard on Lot 1 and Lot 2 to manage storm water drainage from the site. A drainage and utility easement a minimum of 10 feet beyond the basin's 100-year storm high water level elevation will be required. The bottom of the proposed pond is shown to be at 898 and therefore does not meet the 3 foot separation required for an infiltration pond. The developer will need to either line the pond with clay so that it doesn't infiltrate or adjust the pond design so that the pond bottom is at an elevation of 899 and still accommodates the required volume requirements. The grading plans have been revised so drainage is not being directed onto the adjacent properties to the east or west. Storm water is being directed to Linda Avenue, the ponding area or to the wetland via swales graded along the lot lines. Appropriate soil erosion and sediment controls shall be employed during construction of the single family homes. Utilities The current residence at 260 Linda Avenue is on private well and public municipal sanitary sewer. All three (3) lots will be required to connect to public water and sanitary which is capable of handling 3 single family homes. The existing well shall be properly capped and abandoned or disconnected from the house if used for irrigation purposes prior to the issuance of any building permit. 7