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• 77-423 <br />George Jackson 6 Assoc. -3- 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 />Surface Soil At Rate <br />Test I Elevation Test Depth m i <br />P-1 <br />1002.0± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />13 <br />P-2 <br />1003± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />15 <br />P-3 <br />1007.5± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />1S <br />P-4 <br />1007.0± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />8 <br />P-5 <br />995± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />15 <br />P-6 <br />994.5± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />17 <br />P-7 <br />995± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />12 <br />P-8 <br />994.5± <br />Silty <br />Clayey <br />Sand <br />(SM-SC) <br />12 <br />P-9 <br />967± Silty <br />Clayey Sand <br />(SM-SC) <br />7.5 <br />P=10 <br />967.5± Silty <br />Clayey Sand <br />(SM-SC) <br />20 <br />P-11 <br />949± Silty <br />Sand (SM) <br />15 <br />P-13 <br />974.5± Silty <br />Clayey Sand <br />(SM-SC) <br />15 <br />P-14 <br />970.5 Silty <br />Clayey Sand <br />(SM-SC) <br />12 <br />P-15 <br />983± Silty <br />Clayey Sand <br />(SM-SC) <br />20 <br />P-16 <br />984± Silty <br />Clayey Sand <br />(SM-SC) <br />30 <br />PRELIMINARY <br />RECOMENDATIONS: <br />You have indicated <br />that current <br />plans call <br />for developing <br />this site as <br />a single family, residential <br />area. The <br />total <br />size of the <br />site is 23 acres; however, <br />individual <br />lot <br />size <br />is not known <br />at this time. You <br />did, however, <br />indicate <br />that <br />it is desirable <br />for each dwelling <br />to have <br />an individual <br />sanitary disposal <br />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 encowtvrcd over the majority of <br />the tract, ranging in depth from 6 inches to 3 feet. Also, <br />a clayey silt lacustrine deposit was also encountered in <br />boring B-2 between the 4 and 13-foot depth. Soils of this <br />BRAUR* <br />ENGINEERING TESTING <br />