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Ms.Kathy Pollock <br /> May 21,2015 <br /> Page 5 <br /> • Certain types of catchbasins can collect leaves and debris which essentially plug the <br /> catchbasin grates preventing flows from entering the stormsewer. <br /> 3. We do not recommend placing a gradual bituminous berm/speed bump at the end of your driveway <br /> to prevent road flows from running down your driveway as the bump will likely cause other problems <br /> that may be problematic including driver safety issues. <br /> 4. Remove the rock at the curb drain cutout on North Shore Drive(shown in Photo 20), re-grade the <br /> terrain to be dished/swaled, and use new channel-armoring material to completely contain the runoff <br /> from a 24-hour, 100-year, Atlas 14 storm event.The channel armoring material could be properly <br /> designed riprap and filter material or turf-reinforcing material (TRM) such as Enka-Mat R45. <br /> 5. Ask the owner of the 990 property to re-grade their east yard area so that flows are directed to <br /> the south, around their house. <br /> 6. Where runoff from the 990 property courses through the forested and lawn area on the east side <br /> of your property(shown in Photo 7), grade a swale and armor it with TRM such as Enka-Mat 1060. <br /> That swale should be designed with sufficient capacity to contain the peak flow rates from a 24- <br /> hour, 100-year, Atlas 14 storm event. <br /> 2 - ,.j/2-t A ii lD�� - C/ <br /> Please call me at 952-832-2809 with any questions you may have about this letter or our observations and <br /> recommendations. <br /> Sincerely, <br /> Barr Engineering Co. <br /> Steven M. Klein, PE, PH <br /> Vice President <br /> P:\Mpls\23 MN\27\23271432 Drainage Issues-950 N Shore Dr\WorkFiles\Report <br />