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April 10, 1981 <br />Mr. Wyman Haberer <br />9806 10th Avenue North <br />Plymouth, MN 55441 <br />Re: Soil Investigation and <br />Percolation Tests for <br />Lot 11, Block 1, Fairview <br />Orono, Minnesota <br />Dear Mr. Haberer: <br />I have conducted a soil investigation for the above referenced <br />site. The purpose of this letter is to describe the soil <br />conditions encountered at the site and report the results of <br />percolation tests performed on April 8 and 9, 1981. <br />Method <br />Two 10,000 sq. ft. areas ire selected for drainage fields. <br />On the primary field (east side), two upstream holes and a <br />single downstream hole were drilled. On the secondary field <br />(west side), one upstream and one downstream hole were drilled. <br />Beneath the topsoil, very consistent layers of sandy clays <br />and silty sands were found. Because of this consistency, a <br />hole depth of 6' was deemed adequate in all cases. <br />Each hole was filled and left approxin« tely 24 hours to drain. <br />A level elevation was established over each hole with lath and <br />water elevation checked by a ruler attached to a float mech- <br />anism. After the initial filling, water levels were maintained <br />through periodic fillings from water buckets. <br />Results <br />The small variations in perusity are considered due more to the <br />condition of the test holes than to the soil type itself. The <br />overall evaluation would assign a percolation rating of 49 mpi <br />to the site. This would be considered quite suitable for the <br />proposed usage. <br />Very truly yours, <br />Iohn Duffy. <br />413253 <br />I HEREBY CERTIFY THAT THIS PLAN, <br />SPECIFICATION, O'' REPORT WAS <br />PREPARED BY ME OR UNDER MY <br />DIRECT SUPERVISION AND THAT I AM <br />A DULY REGISTERED PROFESSIONAL <br />ENGINEER UNDER THE LAWS OF THE <br />STATE OF MINhI6�_.>TA .— <br />DATE y L t^, REGISTRATION N: <br />