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depth, if not clean out the hole. <br /> 2 . The upper 20 feet of the well will be sealed with bentonite <br /> grout, or neat cement with 5% bentonite grout. The lower <br /> portion of the well can be filled with clean grout or sand <br />' whichever is more convenient. <br /> 3 . Impervious seals will be placed between aquifers, a depth of <br />' 20 feet for each seal if possible. <br /> 4. All materials will be placed with a trime pipe .if the depth <br />' as over 10 feet. <br /> 1 <br /> Page 23 <br /> 1 <br />