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-31- The applicant proposes to prevent possible effluent water quality and back- fill stability problems by sealing any auger holes encountering water with impermeable overburden materials immediately following completion of the angering operation. Sufficient clay materials are available from the over- burden materials encountered at the mine site. Subsidence of the augered area is unlikely to occur due to limited thickness of the coal seams being augered, as long as adequate rib thickness are main- tained. If subsidence were to occur, no structures or renewable resource lands exist within the potentially affected areas. Further, insufficient watershed drainage areas exist upslope from the augered areas to contribute significant surface water infiltration. In the absence of increased water infiltration, it is unlikely that ground water quality or backfill stability problems would occur. Steep Slope Plining The application (p.2.05-11) indicates that some areas to be mined would fall under the steep slope category. These areas should be specifically identified on a mine plan map and a discussion of compliance with performance standards provided. Figure.2.05-8 shows overburden being disposed of downs lope from the mine pit. In areas of steep slope mining, this activity would be pro- hibited. In other areas, disposal of overburden outside the actual mine pit is allowed upon a demonstration that the material is excess. The performance standards for excess overburden would then apply. In order to complete a find- ing of compliance, the Division deems it appropriate to impose the following stipulation. 18. THE APPLICANT MUST IDENTIFY ON MAP 17, PRE-MINING TOPOGRAPHY, Ai.h OF THE AREAS THAT FALL UNDER THE CATEGORY OF STEEP SLOPE MINING. THE STEEP SLOPE CATEGORY DOES NOT APPLY TO AREAS THAT HAVE BEEN OVER- STEEPENED BY PREVIOUS MINING. THE APPLICANT MUST THEN DEAfONST'RATE COMPLIANCE WITH RULE 4.27 FOR THE IDENTIFIED STEEP SLOPE AREAS. THE MAP AND DEMONSTRATION MUST BE SUBMITTED TO THF. DIVISION [JITHIN 120 DAYS OF PERPIIT ISSUANCE. XXII. Miscellaneous Compliance - Rules 2.05.6(5), 4.02, 4.12, 4.19, 4.21 4.28, and 4.30 Surface mining has been conducted within 500 feet of both active and abandoned underground workings. Page 2.05-53 confirms that this mining has been approved by MSHA. Sequencing of surface mining at G.F•..C. and underground mining at Newlin Creek and Dorchester has been developed to avoid hazards to both per- sonnel and equipment. The proposed activities will result in increased resource recovery. Coal exploration is proposed to occur within tl~e permit area as submitted in Attachment A, p. 2.04.15a. The program was submitted to the Division in . January 1982 and was approved.