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- —BACKFlLL MATERIAL <br />GROUND SURFACE <br />3' <br />• s CEMENT PLUG <br />7 or <br />APLUG ACCORDING �– ORD NG TO 4-07-3(2) <br />� (for those intersecting aquifers) <br />Figure 16A TYPICAL BOREHOLE SEAL <br />RN -05 (Repaginated 1/14/09) <br />