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sufficient underground activities to evaluate the application and adequacy of the <br />ventilation plan. <br />The ventilation specialist should participate as frequently as possible in all facets of the <br />plan review, including the in-mine inspection, with strong emphasis on mines with <br />complex ventilation systems. A 6-month review consists o£ <br />a complete re-examination of the ventilation plan; <br />2. amine visit to observe the ventilation system in operation; <br />3. inspection of the bleeder system, if applicable; <br />4. examination of a representative portion of ventilated worked out areas; <br />5. observation of ventilation controls and construction; <br />6. review the information listed in Appendix A; and, <br />review ofmine maps for required information. <br />It is not necessary to routinely require a complete plan submittal to satisfy this review. <br />However, when required in writing by the district manager, the operator must submit a <br />fully revised plan by consolidating the plan and all revisions in an orderly manner and by <br />deleting all outdated material. When the number of revisions to the plan make it difficult <br />to determine the operative provisions of the plan, the district manager should notify the <br />operator in writing to submit a revised plan that incorporates all revisions in an orderly <br />manner, and deletes those provisions that are no longer applicable. <br />The 6-month review should result in correspondence to the operator which identifies the <br />material which constitutes the complete approved plan. A copy of the letter, identifying <br />all material constituting the complete plan, should be used to check the contents of the <br />Uniform Mine File for accuracy and completeness. <br />B. Non producing (B-status) Mines <br />The procedures for the review of approved plans for non-producing mines should be the <br />same as for producing mines except that these reviews need not require underground visits <br />where no one is working or where al] ongoing work is on the surface. In such cases the <br />approved plan on file as well as the operational status of the mine should be reviewed. <br />