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Section 816.15 Continued. <br />measures shall be designed to prevent access to the mine workings <br />by people, livestock, fish and wildlife, and machinery, and to <br />keep acid or other toxic drainage from entering ground or surface <br />waters. <br />Drilled holes no longer needed for monitoring or other <br />approved use will be backfilled and sealed as described in <br />Sections 780.21 and 780.18. <br />• <br />• MR-89-39 816-5(a) Revised 07/il/89 <br />