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U <br />BACXFILL MATERIAL <br />GROUND SURFACE <br />• <br />i ~ <br />I3~ <br />1 <br />I~' s <br />__I. <br />ENT PLUG <br />PLUG ACCORDING TO 4.OT•3(21 <br />(for those intersecting aquifers) <br />• I TYPICAL BOREtiOLE SEAL <br />Figure 16 <br />