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8CHOELL & MA080N, INC. <br />ENGINEERS • SURVEYORS • PLANNERS <br />SOIL TESTING <br />10SB0 WAYZATA BOULEVAPtO • MINJNETONKA. MN SS3A3-04ea <br />(eiaq s^tboi • fax (bis) S4e-eoss <br />February 22, 1989 <br />Mr. Mike Gaffron, City Planner <br />City of Orono <br />P.O. Box 66 <br />Crystal Bay, HN 55323 <br />r ^ <br />Subject:Lauer Hom^-, Inc. Site <br />Adjacent to the Wayzata <br />Country Club <br />Dear Mr. Gaffron: <br />Enclosed for your review and comment are the calculations and <br />recommendations for storm water management on the subject site. Using <br />Information gathered from a site visit, and my telephone conversation with you, <br />we are recommending that a retention ar«a be provided on the site. This basin <br />would retain the additional storm water runoff from construction of a new home <br />and entrance drive. <br />General Design Criteria <br />A. Soil conservation service curve number methods were used to calculate <br />runoff volumes from a 100 year, 24 hour, 5.9 Inch rainfall event. <br />B. Existing and proposed site runoff volumes were calculated. The <br />difference between them Indicates the recommended storage. <br />C. Storage required: 3,000 cubic feet. <br />D. The basin would be drained by percolation Into the ground. <br />E. During extremely Intense storms, the basin will fill to capacity and <br />overflow can be expected. The overflow would represent the existing <br />runoff that now leaves the site. The runoff from the hard surface <br />areas would remain In the basin. <br />F. Minimize construction disturbance to existing site. <br />AFFJRMATtVe ACTON • EQUAL OPPORTUNTTV EIS/IPLOYeR