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Hakanson Anderson Assoc., Inc. 3601 Thurston Avenue Anoka, Minnesota 55303 612/427-5860 Fax 612/427-3,401 - o520 November 19, 1997 Steve Jankowski City Engineer City of Ramsey 1 51 53 Nowthen Blvd. N.W. Ramsey, MN 55303-6197 RE: Stormwater Outlets, City of Ramsey to City of Anoka Dear Steve, Attached is a sketch of the West portion of the City of Anoka. During the design of the Anoka Enterprise Park provisions were made as shown for potential extension of stormwater facilities to the City of Ramsey. The stormwater system within the Anoka Enterprise Park is based on storage of the 100 year return frequency event with depletion or outflow of stored water to the trunk storm system in Thurston Avenue which outlets to the Mississippi River. We would recommend that the same basic design criteria be applied to Ramsey. This would include providing ponding for the 24 hour 100 year rainfall with pond outflow rates sized to deplete the stored water volume over a subsequent 48 hour period. The City of Anoka system can serve as the outlet for significant areas of Ramsey if the Ramsey flow will be "off peak" i.e. retained and delayed in time by storage. The attached map shows the following: Location A, North of electric substation site: A 24 inch R.C.P. is in place, extended to the west right of way line of McKinley Street. This.pipe is sized to accept 10 year direct runoff from portions of Lot 4 BIk 1. The pipe system could be extended to Ramsey and could accept up to 1 2 cfs of off peak pond depletion flow. Location B, West of McKinley at Lurid Blvd. A 36 inch R.C.P. is in place, extended to the west right of way line of McKinley Street. This pipe is sized to accept direct 10 year design runoff from portions of Lots 3 & 4, Blk 1. It has a flow capacity of 28 cfs. The pipe could be extended westerly to Ramsey. The main pipe system in Lurid Blvd. just downstream from this location, is a 72" diameter line that outlets to the AEP Phase 3 Pond. Engineers Landscape Architects Surveyors