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1, General Stratigraphic Column. The Middle Coal Group is stratigraphically positioned between two regressive sandstone deposits. These sandstones are expressed at the surface as prominent cliff-forming units throughout the Williams Fork Mountains. These bounding units are the Twentymile ' Sandstone Member of the Williams Fork Formation and the Trout Creek Sandstone Member of the Iles Formation. These units are considered the significant groundwater aquifers of the area. 6. Narrative Description - Exploration Methods ' It is planned to drill eighteen exploration holes under the approved exploration plan. The drill holes are designated as sites PDH-1 through PDH-16. Depending upon additional data requirements, any of the holes (at its respective location) may be twinned for the purpose of further geologic or hydrologic testing. Each of the holes are shown on Revised Map 1, 1996 - ' 1998 Exploration Drilling. As provided above, the Notice of Intent area is located in Sections 18, 19, 31, of Township 5 North, Range 88 West; Sections 1, 2, 10, 12, and 16, of Township 5 North, Range 89 West; Section 28 of Township 6 North, Range 88 ' West; and Sections 20, 28, 30, 32, and 36, of Township 6 North, Range B9 West. Sites PDH-6, 7, 8, 10, 11, 13, and 14 have already been submitted for DMG approval, and correspond to Sites A, B, C, D, E, F, and G respectively on the original submittal. ' Drilling Operations Drilling will be conducted during two consecutive summer/fall seasons and may continue through the winter if necessary and ground conditions allow. The drilling will be conducted by one ' and three rotary drill rigs capable of rotary drilling and spot coring the coal interval of interest. The primary circulation medium will be water with drilling mud. In the event that ground ' conditions allow, air or an air/foam medium may be utilized. Water for drilling will likely be obtained from local stockponds. Drilling operations are planned to commence during late spring, as ground conditions allow (mid-May to early June). It is currently planned that drilling will be conducted on a twenty four hour basis in order to minimize the total time required. It is anticipated that access road maintenance will be minimal, as ' the intent is to conduct the majority of the exploration efforts during the dry months. Some road maintenance will however, likely be required. In the event that mid-winter drilling is necessary, gates specified by Mr. Haskins, of the CDOW, will be kept locked to preclude public use, and any areas of critical winter range for elk will be avoided as so directed by CDOW. ' Holes will be a nominal 6.25" in diameter and vary in depths from 1