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10/24/94 <br />CITY OF <br />LINO LAS <br />Standards for Facility Design <br />(5) <br />In such situations, baffles may be installed to isolate the <br />inflow area from the remainder of the pond. A desirable <br />alternative (for all pond sizes) is to construct two or more <br />separate ponds in series with a total volume equal to that <br />specified above Item (1). <br />For safety purposes and to provide suitable habitat for <br />rooted aquatic plants, the bench width should be at least 15 <br />feet and the bench slope should not be steeper than 10:1 <br />(horizontal vertical). The bench slope begins at the normal <br />pool elevation and includes lower elevations until the <br />minimum length criteria is met. <br />(6) To provide stability, the side slopes below the bench should <br />not be steeper than 3 feet horizontal to 1 foot vertical. <br />Shallower slopes may be appropriate, depending upon soil <br />engineering properties. Shallower slopes are more feasible <br />for larger ponds. <br />Pond Skimmers <br />During the review, the City may determine that a pond skimming <br />device would be required. Pond skimming devices should be <br />'designed to remove oils and floatable materials up to a one -year <br />frequency event. The skimmer should be set 4 inches below the <br />normal surface water elevation _and should control the discharge <br />velocity to 0.5 fps. <br />Erosion Control <br />The Ramsey County Erosion and Sediment Control Handbook <br />published by Ramsey Soil and Water Conservation District, <br />Protecting Water Quality in Urban Areas, by the Minnesota <br />Pollution Control Agency, and Storm Water Management for <br />Construction Activities: Developing Pollution Prevention Plans <br />and Best Management Practices by the EPA will be the guides for <br />all erosion control measures reviewed by the City. <br />Local Water Management Plan <br />Users. Manual SEH NO: LINOL9402.00 <br />Page 19 <br />