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H°Warct R, <br /> <br />Green Company <br /> <br />October 6, 2003 <br />File: 822070J-0240 <br /> <br />Cara Schwahn-Otto <br />Otto Associates <br />9 ,,West Division Street <br />Buffalo, MN 55313 <br /> <br />RE: <br /> <br />BOULDER POINT DRAINAGE CALCULATIONS <br />CITY OF ELK RIVER <br /> <br />Dear Ms. Schwahn-Otto: <br /> <br />We have reviewed the drainage calculations for the Boulder Point Development located at the <br />intersection of CSAH 12 and Twin Lakes Road in the City of Elk River. The drainage calculations <br />were received on September 25, 2003. The drainage calculations are approvable, but some <br />additional information needs to be provided prior to approval. Additional information would include a <br />calculation of the additional storage provided in the pond given the proposed modification shown on <br />your grading plan. Also, we would like to see detailed information on how the disturbed area of the <br />pond will be restored and how the outlet will be placed into the pond. The outlet should include an <br />appropriate amount of Class IV dprap. <br /> <br />Please provide this additional information as soon as it is available. If you have any questions <br />regarding this issue, please call. <br /> <br />Sincerely, <br /> <br />Howard R. Green Company <br />City Engineer <br /> <br />TJM:sw <br /> <br />Cc: Scott Hadicker, City of Elk River <br /> <br />Ltr-100603--Otto-Schwan <br /> 1326 Energy Park Drive - St. Paul, MN 55108 · 651/644-4389 fax 651/644-9446 toll free 888/368-4389 <br /> <br /> <br />