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y <br /> FIGURE 4 Schematic of Monitoring Wells Construction <br /> I <br /> to Test the Upper Water Strata <br /> W <br /> Ground Surface Water Tight Lid <br /> -------------- <br /> Lack:ng Well Cover <br /> Ca eti•.0 d <br /> by Cemmt <br /> Bentonite Annular <br /> Seal <br /> - Well Casing <br /> Filter Pack <br /> •I <br /> 0 Ground Water Level <br /> Perforated <br /> Casing <br /> Aquifer <br /> �.. <br /> Y Min.6-inch <br /> Borehole <br /> Clay(Aquitard) r End Cip <br /> Typical Mon'toring Well Coltstruction <br /> ,a <br />