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DMG Concern k) Pond E (facilities areal values for 2/26/92 appear doubled. TCC Resoonse The corrected page has been enclosed. DMG Concern II No depths or screen intervals are shown for 008-EFC, 91-M006, FBR-11A, or 91-M005. TCC Resoonse The revised table has been enclosed. information pertaining to we11008-EFC will be included on the table during the 1993 AHR submittal to facilitate submittal of these responses. DMG Concern Monitoring Frecuencv 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 sections (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. TCC Resoonse TCC wishes to re-iterate that the loss of well 006-88-2 was not anticipated at that point in time, even with the observed decline in water levels. TCC has noted the Division's position on this matter, and will attempt to avoid similar situations in the future while monitoring in accordance with the plan.