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SECTION 3 <br /> RESULTS OF RECENT SOIL AND <br /> GROUNDWATER SAMPLING <br />' This section presents field observations and laboratory analytical <br /> results of soil and groundwater sampling conducted at the Manna <br /> i Pro Facility during November and December 1990 Dunng the period <br /> November 8 through 15, 1990, nine soil borings (MP-1 through MP-9) <br /> were installed Three of these borings were converted to 4-inch <br /> i monitonng wells These wells were constructed to assess <br /> groundwater contamination and the direction and gradient of <br /> groundwater flow Dunng the period December 1 through 7, 1990, 16 <br /> i additional soil bonngs (MP-10 through MP-25) were nstalled and <br /> sampled Three of these borings, MP-14, MP-15, ana MP-18 were <br /> converted to monitoring wells <br /> Data gathered during the installation of the 25 soil borings has been <br /> used to construct two cross-sections that illustrate the lithology <br /> beneath the site The locations of the cross-sections are shown on <br /> Figure 1-2 The cross-sections are shown in Figures 3-1 and 3-2 <br /> Typically, these borings encountered sequences of clay and sand to a <br /> total depth of 60 feet The typical geologic sequence encountered is <br />' shown below <br /> Depth (ft) Description of formation <br /> 0-25 clay <br /> 25-35 coarse sand <br /> 35-45 fine sand grading to sandy clay <br /> 45-50 clay with intermittent sand lenses <br /> 50-60 cl ay <br /> Hwlroeeology <br /> No significant unconfined groundwater was encountered in any of <br /> the borings First water was encountered at depths of between 43 and <br /> 48 feet below grade Water levels quickly rose to between 39 and 40 <br />' 3-1 <br />