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RULE 4 PERFORMANCE STANDARDS <br />4.07 Sealing of Drilled Holes and Underground Openings <br />4.07.1 General Requirement <br />Each exploration hole, or other bore hole well or other exposed underground opening encountered <br />during surface mining, will be cased, sealed,. plugged, or otherwise managed to meet the <br />requirements of this Section and described more fully in Section 2.05.4. <br />Holes used for surface blasting will not be included under the requirements of this Section. <br />4.07.2 Temporary Sealing <br />Each exploration hole or other drill or bore hole described in this Section will be protected, <br />inspected and maintained according to this Section. This performance is described more fully in <br />Section 2.02 and 2.05.4 of this application. <br />4.07.3 Permanent Sealing <br />Drilled holes no longer needed for monitoring or other approved uses will be backfilled and sealed <br />as described in this Section. This performance is described more fully in Sections 2.02 and 2.05.4 <br />of this application. <br />4.07.4 Abandonment in Designated Groundwater Basins <br />This subsection is not applicable to the Colowyo mining plan. <br />Exploration taking place inside and outside of the permit area will be handled through the Notice <br />of Intent (NOI) procedures. See the appropriate NOI for details for each program. <br />With the approval of Technical revision 50, all exploration holes located within the permit <br />boundary are transferred to NOI X-95-109-5 and are managed under Coal Exploration procedures. <br />Wells drilled as an integral part of water monitoring plans identified in the PAP (Permit C-81-019) <br />and water supply wells (for identified in the PAP (Permit C-81-019) and water supply wells (for <br />mining purposes) are managed under this Permit C-81-019. <br />4.08 Use of Explosives <br />4.08.1 General Requirements <br />Colowyo will comply with all applicable State and Federal laws in the use of explosives. <br />Colowyo will conduct all blasts that use more than five pounds of explosives or blasting agent <br />according to the schedule required by Section 4.08.3. <br />Rule 4 Performance Standards 4-30 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />