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NOT TO SCALE <br /> c <br /> GROUNDWATER TABLE <br /> 1 1• <5FT. <br /> BENTONITE OR(TREMIEE) <br /> NST CEMENT BACKFILL <br /> TO WITHIN 3 FT. <br /> OF PERMEABLE MATERIAL <br /> FIGURE 3: TYPICAL WELL CONSTRUCTION <br /> ALTON GEOSCIENCE <br /> 1000 8uma Ave.-81e.140 <br /> cor>�.d,CA scs2a <br />