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<br />~ <br /> <br />TKDA <br /> <br />TOLTZ, KING, DUVALL, ANDERSON <br />AND ASSOCIATES, INCORPORATED <br /> <br />ENGINEERS. ARCHITECTS. PLANNERS <br /> <br />1500 PIPER JAFFRAY PlAZA <br />444 CEDAR SmEET <br />SAINT PAUL. MINNESOTA55101-2140 <br />PHONE:612J2G2-4400 FAX:6121292..oo83 <br /> <br />October 3, 1996 <br /> <br />Ms. Kate Drewry <br />District Administrator <br />Rice Creek Watershed District <br />3585 Lexington Avenue North, Suite 132 <br />Arden Hills, MN 55126-8016 <br /> <br />Re: Northwestern College - Tennis Courts <br />Pennit Application for Final Site Drainage Plan <br />TKDA Corom. No. 11149-02 <br /> <br />Dear Ms. Drewry: <br /> <br />Enclosed are a Pennit Application and three (3) copies of Stonn Water Management Calculations <br />and Construction Plans for the development of 6 Tennis Courts on the Northwestern College campus <br />just to the south of the Roseville/Arden Hills corporate boundary and to the east of the main <br />College Campus Drive. Also enclosed is a check for $150.00 for the Rice Creek Watershed <br />District Penmt Fee. Please place this project on your next meeting agenda. <br /> <br />TIle subwatershed in which the tennis court development is proposed currently drains to a <br />depression in the woods and percolates into the ground (the soil in this area is generally quite <br />sandy). We propose to maintain this general drainage pattern and direct runoff from the new <br />tennis courts into this depression. We understand that the Watershed District will allow this <br />provided that the depression volume is great enough to hold two 100 year stonns back-to-back. <br />For this subwatershed that volume would be 57,615 cU.ft. The capacity of the existing <br />depression below contour elevation 926.0 is 45,649 cu,ft. To obtain the required capacity of <br />57,615 cu.ft., construction will include raising the rim of the depression slightly along the <br />southeast edge from a low point of 926.08 to elevation 927.00 which will increase the capacity <br />of the depression to 60,879 cu.ft. <br /> <br />If you have any questions or need additional infonnation, please contact me at 292-4420. <br /> <br />Sincerely, <br /> <br />Richard L. Gray, ASLA <br /> <br />RLG:mk <br />Enclosure <br /> <br />cc: Don Ericksen <br />Glen Peterson <br />Michael Falk <br />Wes Hendrickson <br />Dan Fabian <br /> <br />An Equal opporrunlly Employ'" <br />