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Mr. Marcus Middleton Twentymile Coal Company -2- July 29, 1993 c) 009-79-4 Table 1 shows screened interval 24220-242 feet? d) Well 006-82-74C elevation is 6845.92 in Table 1 and 6840.61 on data sheet. Which is it? e) Values on or around 8/22/92 show apparent doubling of values (i.e., 32°C, 1840 EC, 17 pH1. This is apparent in numerous places throughout the data. f) Site 305 elevation in Table 1 does not agree with data sheet. g) Site 307 elevations do not match between data sheet, Table 1 and elevation table. h) For the second or third year, no data was submitted for Site 14. i) Site 8 elevation values also do not agree between all sources. j) Values for Pond E (tipple) on 12/1/91, 12/16/91, and 12/20/91 are much larger than runoff season values. They also do not match what was reported in the DMR's. Also, no datum elevation is shown. k) Pond E (facilities area- values for 2/26/92 appear doubled. U No depths or screen intervals are shown for 008-EFC, 91-M006, FBR-1 1 A, or 91-M005. Monitoring Freauencv Bedrock We/ls 1. As per our discussions, the Division's position on sampling of wells which are to be undermined (or otherwise, for that matter) is as follows: When a level in a well shows massive declines and it is in front of the advancing long- wall section (and subsequent subsidence), that is a very definite sign that potential well casing problems may develop, caused by subsidence and/or dewatering. In the case of the Wadge Overburden wells, if TCC can measure a level and extract a water sample as per the approved plan, then there is no compliance problem. If, however, TCC continues to monitor this well after it dewaters completely (i.e., taking no field readings or quality samples) and this well is one of the required two downgradient wells to be monitored,.then there is a definite compliance problem. If TCC's approved plan calls for two downgradient wells in the Wadge to be monitored and sampled, then dewatering by the predicted and expected advance of the longwall face is not a valid reason for not sampling two wells downgradient. When wells dewater from the advancing longwall face, TCC should be prepared to begin monitoring in a new downgradient well (or wells) to insure compliance with the approved plan (i.e., no gaps in the sampling record). If this is ambiguous or unclear, please ask for clarification. Otherwise, the Division will assume all parties are clear on this issue. 2. No water elevation (or depth) is shown for 001-83-107.