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Ramsey- Washington Metro <br />1;3 District <br />¢G9cJ <br />Tom Cesare <br />BKBM Engineers <br />5930 Brooklyn Boulevard <br />Minneapolis, MN 55429 -2518 <br />12/27/00 <br />Dear Mr. Cesare. <br />1902 7-,st county Road 3 <br />—, 09 <br />(35 '1 1 i� -.-L'V 9 U <br />nivmwCi@rat.n.or y <br />Thank you for bringing in the plans for St. John's of Little Canada Parish Center to <br />review with me on Dec. 26`h. As we discussed at our meeting, the Watershed District will <br />require the following changes to the plans: <br />1. Calculations and details shall be submitted for the infiltration trench. The <br />infiltration trench is required to provide a 72 -hour detention time for the 2 -year <br />flood event. <br />2. An outlet structure shall be constructed similar to the enclosed drawing. The <br />structure should allow any rain events greater that the 2 -year event to overflow <br />into the structure. The structure and the trench should be designed so that the 2- <br />year event produces a depth of 18 -24 inches in the trench. If the diameter of the <br />structure and the outlet pipe is large, the infiltration trench should be able to <br />contain the 100 -year event. <br />3. The pipe leading to FES #10 and the infiltration trench outlet pipe shall be <br />extended to the normal water level of Savage Lake. <br />4. Any swales conveying concentrated flows shall have a maximum slope of 2 %. <br />Slopes between 1 -2% shall be lined with Enkamat or similar material. <br />5. A Swale shall be constructed on the 4:1 slope west of CB #3 and terminate where <br />the slope becomes 1.5 %. The Swale shall be 10 feet wide, 1 foot deep and be <br />Lined with Enkamat or similar material. <br />6. There is a wetland along Savage Lake. The District Technician shall identify the <br />wetland line prior to installation of the silt fence. The silt fence shall be installed <br />a minimum of ten feet uphill of the identified line. <br />Page 58 <br />