1976-08-05 Soil Boring Report - Laserfiche WebLink

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76-301 Johnson $ Peterson, Inc. August 16, 1976 does not appear that the groundwater levels were completely stabilized atthe time the water level checks were made. Also, some of these are possibly "perched" water levels. Water levels should be expected to show normal seasonal and annual fluctuations. aercolation tests indicated soil absorptivities, in minutes per inch (mpi) as follows: Test # P-4 P- 5 P-6 Surface Soil At Elevation Test Depth Rate (mpi) 9SS.0± Clayey San 240 953.01 Clayey Sand (SC) 240 978.Ot Clayey Sand (SC) 48 943.S± Sandy Clay (CL) 240 Preliminary Recommendations: You have indicated that current plans call for developing this site as a single family, residential area. Lot sizes currently planned are on the order of 2 acres with each dwelling having an individual sanitary disposal system. Borings were taken generally in the low areas across the site and provide preliminary information relative to the general soil types encountered in this area. The borings did not encounter any highly organic soils such as peat or muck, how- ever, a black mineral soil was encountered to a depth of 3 feet in boring B-7 which was put down in a low area near the southeast corner of the site. Power auger borings do not provide information relative to the strength parameters of the various soil types encountered, however, mineral soils of the types brought to the surface by the auger generally are of sufficient strength to support single family dwellings without detrimental settlement. Black mineral soils are likely quite soft and would not provide an adequate foundation. For any houses in low areas soft black soils will likely have to be removed in their entirety from building areas. There is considerable variation in the results of percola- tion tests conducted. Percolation test 11, which was conducted in a more sandy material, was found to have a percolation rate Of S mPi, which indicate that the soil in this area can absorb water relatively quickly. Results of percolation test P-S put down in a more eoliesive soil, indicates that these soils are less permeable with a rate of 48 mpi, however, a percolation rate of this magnitude would be considered acceptable.