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<br />cc <br /> <br />NOI/c(caf , <br />f i71If/O~- <br />" RECE\VEO <br />JUL 1 5 2005 <br /> <br /> <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />July 13, 2005 <br /> <br />Mr. Bob Erickson <br />D.R. HortOn <br />20860 Kenbridge Court 11100 <br />Lakeville MN 55046 <br /> <br />RE: mOlT BROOK FARMS WETLAND <br /> <br />Dear Mr. Erickson: <br /> <br />nus correspo~dence is intended to give you a brief summary of past and recent events surrounding <br />the wetland complex in the Trott Brook Farms subdivision. In 1999/2000 when the City was <br />planning to extend urban services to this area and your engineer, Westwood Professional Services, <br />was working on the design of Trott Brook Fanus, we worked together jointly to utilize the wetland <br />complex as a detention basis (Westwood's wetland report classified this area as a Type 1,2 and 3 <br />wetland complex). There was already a 42-inch diameter storm sewer out of the wetland complex <br />controlled by a cap skimmer. Owing the development of this whole area, that cap skimmer was <br />raised four feet and a 12-inch orifice was provided two feet down from the top. The concept behind <br />this design was that in a lOO-year rainfall event, storm 'Water from the tributaty area lying north of <br />CSAH 12 would reach this wetland complex and most of it would be held for a period of time and <br />then slowly let out through. the 12-inch orifice over a period of 24 - 48 hours after the storm. <br /> <br />Somewhere between the last 12 - 24 months the orifice became plugged. City staff'W3.S aware of this <br />plugged orifice, but only monitored the situation until recently. With the development of the Trott <br />Brook Farms 11 ch Addition, it became clear that the high water level in the wetland complex due to <br />the plugged orifice was problematic. The aty Street Department unplugged the orifice <br />approximately two weeks ago and the pond drained do'WIl over a period of a couple days. In <br />reviewing the outlet structUre after the water had been lowered, we discovered that the orifice pipe <br />had settled at least a foot. We are now working to correct the outlet strncture to re-establish the <br />nomlal water level, which will be at least one ioot higher and may be slightly . <br />more than the current wetland complex water elevation. We cornznitted to the City Council to have <br />this completed within approximately two weeks. <br /> <br />If you have any further questions about this issue or would like to discuss it further, please call me at <br />763/635-1051. <br /> <br />Sincerely, <br /> <br />c;--. <br />~~ <br /> <br />Teny J. Maurer, PE <br />Gty Engineer <br /> <br />Phone: 763.63;.1000 <br />Pax: 763.635.1090 <br /> <br />www.cl.elk-river.mn.us <br /> <br />~ . d <br /> <br />8~06 'oN <br /> <br />lN~Sv:L SOO~ '8l'lnr <br />