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In the event that a storm larger than the 100 -year occurs the overflow from the pond will remain <br />in the depressed area around the pond and due to the elevation of the road there is little <br />concern that runoff will overtop the road. <br />Storm Sewer and Culverts <br />Storm sewer piping will be generally designed to accommodate the 100 -year storm event. In all <br />cases, pipe velocities at the outlet are kept below 12 fps to minimize the need for energy <br />dissipation or reinforcement at bends. Pipe velocities greater than 3 fps during a 2 -year event <br />are desirable to keep the pipe free of debris. To determine required pipe sizes, pipe networks <br />will be modeled using StormCAD V5.5 by Haestad Methods. <br />There are three culverts proposed for the site. <br />ENVIRONMENTAL PROTECTION CRITERIA <br />General <br />The water - quality /detention pond outfalls into a wetland area. There are no wetland areas within <br />the construction site as delineated with this project nor are there any threatened or endangered <br />species. <br />Sedimentation and Erosion Control Measures <br />During construction, silt fence, wattles, erosion control blankets, inlet and outlet protection and <br />vehicle tracking pads will be utilized to prevent sediment entering the storm sewer system or <br />sediment leaving the site. All disturbed areas will be seeded with native seed to prevent soil <br />erosion. The proposed pond will be constructed in the first phase in order to act as a sediment <br />basin. The erosion control plan is part of the Final Construction Plans. All erosion and sediment <br />control methods shall be maintained and repaired by the owner during construction and shall be <br />inspected after each heavy precipitation event. <br />CLC ASSOCIATES <br />Page 4 <br />