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SUNDE ENGINEERING, INC. <br />GERALD M. SUNDE, Consulting Engineer <br />9001 East Bloomington Frwy • Bloomington. MN 55420 • (612) 661-3344 <br />June 20, 1989 <br />MR. AL 6REIG <br />137 Chevy Chase Drive <br />Wayzata, Minnesota 55391 <br />Dear Mr. Greig: <br />This letter summarizes our field visit to your home in Orono, Minnesota <br />and »• ;iew of the plans for drainage to the west of your site. Our understanding <br />of the potential problems are as follows: <br />The Wayzata Country Club desires to sell off a parcel located immediately <br />to the west of your house for the construction of a single family residence. <br />As part of that development, they are intending to make some corrections to <br />the surface water drainage system. These include building a small storm water <br />storage pond located just west of your property line. Our comments on the <br />proposed plans are: <br />1. You indicated that one of the . aasons for installing tue ponding <br />area and making the drainage plan corrections was it was felt <br />that construction of the single family home on the large lot would <br />increase the runoff. Water presently runs easterly parallel to <br />your rear lot line and the . between houses to the east of your <br />site and to Chevy Chase Drive. The water does not now run across <br />your property. It is very doubtful whether the runc*ff amounts <br />will be increased for the design storm events because of <br />construction of one house on the large lot. This is because the <br />critical runoff events in the area are the snow melt events. For <br />snow melt events the ground surface is normally frozen and there <br />is not much difference between runoff from pa;ed or surfaced areas. <br />Therefore, the drainage area should have similar amounts of runoff <br />in either case. <br />2. Also, we measured the area that would be impervious (hard surfaced) <br />with the proposed design of the property. It is less than lyX <br />of the total lot area. This is a very small amount of impervious <br />for a r* ^ ntial area and approximates conditions in rural areas. <br />Therefore, we feel for at least the design storm events, there <br />will be little if any increased runoff due to the construction <br />of one house.