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the most part, be limited to dry weather use. Additional steps to minimize sur- face disturbance will include burying, or removing from the site, all garbage and foreign debris. Surface and sub-surface waters will be protected from contamination and the intermingling of water from different aquifers will be prevented. Also, unless required for monitoring or as a water supply, artesian flow will be prevented by appropriate sealing of the hole. Where necessary, small diversions will be used to divert surface runoff around and away from the immediate drill site. Runoff from the drill sites will be very small because of the small area involved and will not be passed through a sedimentation dam unless it occurs in a drainage where a sedimentation dam has already been constructed. Any water generated by the drilling operation, i.e. when drilling with water, will be contained in small pits and covered with at least two feet of material or allowed to evaporate. Drill holes located in areas where mining is not imminent (will not be mined within two years) will be plugged according to Figure 3.3.1. A steel rod or wooden marker will be cemented in the collar or as close as practical for future identification. These holes will be reclaimed as will any roads that are built to provide access and are no longer required. This will include returning the area to its approximate original contours, ripping or discing heavily compacted areas, replacing topsoil, and seeding with appropriate seed mixes (refer to Sec- tion 3.6.3.5). In instances where a drill hole is located on cropland, a steel rod or wooden marker will not be cemented into the drill hole collar. To reduce the effect on farming practices, the hole will be cemented off approximately two to three feet below the ground surface and the hole covered with previously removed topsoil (see Figure 3.3-1a). Since all drill holes are accurately located for mine acti- vity purposes, an above-ground marker is not required. In the event that the hole needs to be relocated at a later date, survey coordinates are available. The reclamation procedures as described earlier will be followed after the drill hole has been sealed off. Development drill holes located in areas where mining is imminent (will be mined within two years), and that do not enter an aquifer below the lowest coal seam to be mined, will not be sealed according to Figure 3.3-1. However, drill cutting will be placed into the holes to seal the opening at the surface. This will pre- vent injury to man and wildlife. The proximity of the open pit and its imminent advancement through the area minimizes any possible benefit of sealing such drill holes. 3-25 REVISED MAY 1 '87