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HAKANSON professional engineers and surveyors ANDERSON ASSOCIATES, Inc. P.O. Box 665 2665 4th Avenue North Anoka, Minnesota 55303 612/427-5860 July 24, 1980 Mr. William B. Moore 4701 West Branch Road Mound, Minnesota 55364 Re: Moore Percolation Dear Mr. Moore: At your request, percolation testing was performed on part of the south portion of your property located in part of the West 1/2 of the Northwest 1/4 of Section 7 Township 117 North Range 23 West in Hennepin County, Minnesota. Standard methods of percolation testing were employed. Elevations are relative to an assumed elevation of 100.0' based at a spike in the southeast base of a 3.0' diameter oak (see enclosed sketch) . This report includes: 1. Percolation test results 2. Soil boring logs 3. Testhole location sketch if tri 4 4. Discussion and recommendations. .t Percolation test results are as follow: Soil Material at Hole Elevation Depth(inches) Bottom of Hole Percolation Rate(min/in) #1 100.6 26 Clay loam 7.6 #2 103.2 28 Clay loam 6.0 #3 100.3 24 Clay loam 10.1 #4 103.8 24 Clay loam 7.6 #5 97.1 24 Clay loam 13.1 #6 97.6 24 Clay loam 12.4 Measured percolation rates are somewhat rapid for the texture of the soil material in which the percolation tests were run. A more typical percolation range for clay loam textured soils is 45 to 60 minutes per inch. Design factors for the septic system for this site are based on this percolation rate range. The soil boring logs show significant soil mottling begins at 5.0 feet depth and 4.0 feet depth at Boreholes #1 and #2, respectively. Soil mottles. (spots of contrasting color) are accepted indicators of periodic saturation in soils. Because the City of Orono requires three (3.0) feet elevation difference between the bottom of absorption trenches and the water table or soil mottling, a shallow civil • municipal • planning • soils • land surveying