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WILLIAM D. SCHOELL <br />CARLISLE MADSON <br />JACK T. VOSLER <br />JAMES R. ORR <br />HAROLD E. DAHLIN <br />LARRY L.HANSON <br />RAYMOND J. JACKSON <br />WILLIAM J. EIREZINSKY <br />JACK E. GILL <br />FRANK V. LASKA <br />Anderson Builders <br />3900 Leslee Curve <br />Excelsior, MN 55331 <br />SCHOELL & MADSON, INC. <br />ENGINEERS AND SURVEYORS <br />7601 • 50 NINTH AVENUE SOUTH • HOPKINS. MINNESOTA 55343 <br />April 3, 1975 <br />Attention: Mr. Keith Anderson <br />Subject: Storm water Runoff, Lot 7, Block 1 <br />of Carman's Cove, Orono, <br />Our File Fo. 8636. <br />Gentlemen: <br />As requested, we have studied various methods of im- <br />proving the quality of runoff on the subject property in <br />compliance with Lake Minnetonka Conservation District Guide- <br />lines. We consulted with the Engineers for the Minnehaha <br />Creek Watershed District and Frank Mixa, the Director of <br />Lake Minnetonka Conservation District in preparation of this <br />report. Both these authorities indicated their approval of <br />the -recommendations contained herein. <br />The LMCD Guideline Policy Statement limits the imper- <br />vious area of any lot to 25 percent of the land lying beyond <br />50 feet, but within 250 feet of the lakeshore, unless adequate <br />measures are taken to enhance the quality of runoff. Using <br />the survey prepared by Cardarelle & Associates, Inc., we calcu- <br />late the total lot area beyond 50 feet to be 12,550 square feet. <br />The impervious area would thus be limitE!d to 3,137 square feet. <br />The proposed 1,120 square foot addition to the existing two- <br />story residence will increase the total impervious area including <br />roof area and driveway to 4,800 square feet, or 38 percent. <br />We recommend the use of a settling pond with a permeable <br />berm outlet as the most practical solution of improving the <br />quality of runoff. The pond would be constructed by grading a <br />Swale in the rear lot area. The runoff from the entire im- <br />pervious area as well as approximately 5,400 square feet of <br />lawn area would drain to this ponding area and outlet to the <br />lake through a pervious berm. <br />The recommended berm section is as shown on the attached <br />detail. The lcuer eight inches of the berm is sp�cifieri to <br />be 1/4 inch fine filter aggregate. Larger aggregate <erould <br />