1976-12-03 Septic System Design Report

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76-301 Sullivan Septic Service -3- December 3, 1976 stabilized at the time the water level checks were made. Also, based on soil borings taken by our firm throughout the project in August of this year, the possibility exists that the groundwater in this boring could possibly be in a "perched" condition. Water levels should be expected to show normal seasonal and annual fluctuations. Percolation tests indicating soil absorptivities; in minutes per inch (mpi) are as follows: Test N P-1 P-2 P-3 Surface Elevation RECOMMENDATIONS: 964.4t 958.7t M.3t Soil At Rate, Test Depth (mpi) Silty Clayey Sand (SC SM) 30 Silty Clayey Sand (SC SM) 30 Silty Clayey Sand (SC SM) 30 You have indicated that current plans call for the construc- tion of a 4-bedroom, single family dwelling on this lot. The type, size, and location of the proposed house is not known at this time. Current plans call for this dwelling to have its own individual sanitary disposal system. The lot is approximately 2 acres in size with a hill on the east side of the lot and another on the northwest side of the lot which slopes gently to the southwest towards Lake Minnetonka. The power auger boring does not provide information relative to the strength parameters of the various soil types encoun- tered, however, mineral soils of the types brought to the surface by the auger generally are of sufficient strength to support a single family dwelling without detrimental settle- ment. All three percolation tests which were conducted, generally in the east half of the lot, were all found to have a perco- lation rate of 30 mpi, which does meet the normal minimum allowable rate of 60 mpi. Based on the results of the ' percolation tests, a minimum of 300 square feet of absorptive trench per bedroom will be required on this lot. For the proposed 4-bedroom house, a minimum of 1200 square feet of BRAOR' ' ENGINEERING TESTING