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77-423 <br />George Jackson & Assoc. -3- <br />August 31, 1977 <br />that groundwater levels were completely stabilized at the <br />times the water level checks were made. 3) There is a <br />possibility that some of these areas contained "perched" <br />water levels. Water levels should be expected to show <br />normal seasonal and annual fluctuations. At the current <br />time, groundwater levels are at or slightly below the <br />normal. <br />Percolation tests indicated soil absorptivities, in minutes <br />per inch (mpi) as follows: <br />Test # <br />Surface <br />Elevation <br />Soil At <br />Test Depth <br />Rate <br />m i <br />P-1 <br />1002.0± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />13 <br />P-2 <br />1003± <br />Silty <br />Clayey Sand <br />SM- <br />15 <br />- <br />- <br />i <br />e <br />P-4 <br />1007.0± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />8 <br />P-5 <br />995± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />15 <br />P-6 <br />994.5± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />17 <br />Y-7 <br />995± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />12 <br />P-8 <br />994.5± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />12 <br />P-9 <br />967± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />7.5 <br />P-10 <br />967.5*_ <br />Silty <br />Clayey Sand <br />(SM-SC) <br />20 <br />P-11 <br />953± <br />Silty <br />Sand (SM) <br />20 <br />P-12 <br />949± <br />Silty <br />Sand (SM) <br />IS <br />P-13 <br />974.5± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />15 <br />P-14 <br />970.5 <br />Silty <br />Clayey Sand <br />(SM-SC) <br />12 <br />P-15 <br />983± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />ZO <br />P-16 <br />984± <br />Silty <br />Clayey Sand <br />(SM-SC) <br />30 <br />PRELIMINARY <br />RECOMMENDATIONS: <br />You have indicated that current plans call for developing <br />this site as a single family, residential area. The total <br />size of the site is 23 acres; however, individual lot size <br />is not known at this time. You did, however, indicate that <br />it is desirable for each dwelling to have an individual <br />sanitary disposal system. <br />Borings were taken at random across the site and provide <br />preliminary information relative to the general soil types <br />encountered in this area. The borings did not encounter any <br />highly organic soils such as peat or muck; however, some <br />black mineral soils were encountered over the majority of <br />the tract, ranging in depth from 6 inches to 3 feet. Also, <br />a clayey silt lacustrire deposit was also encountered in <br />boring B-2 between the 4 and 13-foot depth. Soils of this <br />Bmut <br />ENGINEERING TESTING <br />