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Mr. Gregg R. Squire <br />• EEC Technical Revision -'File No. C-81-G44 <br />April 29, 1986 <br />Page 3 <br />5. Technical revision narrative, page III-73a, paragraph 1, sentence 2: <br />From what are the 10 ft. drawdowns derived, calculation or <br />estimations? <br />RESPONSE: <br />See page III-71 last paragraph, for description of head distribution in <br />the E Seam in the access area. Using this data, and the estimated <br />thickness of the seam, the distribution of artesian and unconfined effects <br />on the E Seam where estimated. <br />6. Technical Revision narrative, page III-78, paragraph 3: The <br />statement made that indicates no impact will occur by development in <br />the "E" Seam access on surface streams is not supported by enough <br />evidence. Furthermore, this statement is in disagreement with the <br />statement on page III-71, paragraph 2 that implies the "E" Seam <br />• access is located near the subcrop exposure in the stream valley, and <br />that the seam is partially saturated at this point which could mean a <br />possible direct hydrological connection to the recharge area by <br />virtue of its partial saturation. <br />RESPONSE: <br />Page III-71, paragraph 2, states that the E Seam is in the subcrop area. <br />The subcrop area is located on the side of a slope, well above the stream <br />valley. The area has a rather steep slope and therefore, due to the high <br />runoff, does not represent a good recharge area. The E Seam access area <br />is located over 2,000 ft. from the nearest subcrop of the E Seam under the <br />Williams Fork River. Most of the estimated 7 gpm of water removed will be <br />coming from storage in the aquifer; therefore, in the worst case only a <br />small percentage of this small amount of water could possibly be coming <br />from the stream. See the stream inflow calculations for the No. 5 and Nc. <br />9 Mines for comparison. <br />7. The operator purposes to utilize a culvert tc pass flow under the <br />permanent rock waste disposal area. Due to the minimal size of the <br />pile, a culvert may be acceptable versus the more commonly used rock <br />drain. However, the following need to be specified in the design of <br />the culvert. <br />• a. Compaction standards to be followed around the culvert. <br />b. The wall thickness of the culvert. <br />