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76- 301 <br />Johnson $ Peterson, Inc. .3- August 16, 1976 <br />does not appear that the groundwater levels were completely <br />stabilized atthe time the water level checks were made. <br />Also, slime of these are possibly "perched" water levels. <br />Water levels should be expected to show normal seasonal and <br />annual fluctuations. <br />Percolation tests indicated soil absorptivities, in minutes <br />per inch (mpi) as follows: <br />Surface <br />Soil At <br />Test / <br />Elevation <br />Test Depth <br />Rate (mpi) <br />P-1 <br />956.0*- <br />Silty Sand <br />(SM) <br />5 <br />P-2 <br />955.0! <br />Clayey Sand <br />(SC) <br />240 <br />P-3 <br />953.0+ <br />Sandy Clay <br />(CL) <br />120 <br />P-4 <br />953.0± <br />Clayey Sand <br />(SC) <br />240 <br />- <br />48 <br />_ P-6 <br />�943.5± <br />t­a�ndyClay�CCL) <br />24 <br />Preliminary Recommendations: <br />You have indicated that current plans call for developing this <br />site as a single family, residential area. Lot sizes currently <br />planned are on the order of 2 acres with each dwelling having <br />an individual sanitary disposal system. <br />Borings were taken generally in the low areas across the site <br />and provide preliminary information reXa&&Mg=jo thg glneral <br />soil entered in this The orings did not <br />Virc-o"u"n—ter any higHly organic soils such as pgat or muck, how- <br />ever, a black mineral soil was encountered to a depth of 3 <br />feet in boring B-7 which was put down in a low area near the <br />southeast corner of the site. / <br />Power auger borings do not provide information relative to <br />the strength parameters of the various soil types encountered, <br />however, mineral soils of the types brought to the surface <br />by the auger generally are of sufficient strength to support <br />single family dwellings without detrimental settlement. Black <br />mineral soils are likely quite soft and would not provide an <br />adequate foundation. For any houses in low areas soft black <br />soils will likely have to be removed in their entirety from <br />building areas. <br />There is considerable variation in the results of percola- <br />tion tests conducted. Percolation test 11, which was conducted <br />in a more sandy material, was found to have a percolation rate <br />Of S mpi, which indicate that the soil in this area can absorb <br />water relatively quickly. Results of percolation test P-5 put <br />down in a more cohesive soil, indicates that these soils are <br />less permeable with a rate of 48 mpi, however, a percolation <br />rate of this magnitude would be considered acceptable. <br />