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condition comparable to that existing <br />exception to this being the Thompson <br />associated with potential subsidence <br />of property transfers. <br />4.20.4 BUFFER ZONES <br />prior to subsidence. The only <br />Ranch Buildings where liability <br />is expressly limited by the provisions <br />There are no perennial streams, or impoundments with storage volumes in <br />excess of twenty acre-feet, within the area which would potentially be <br />effected by underground mining activities. Large ephemeral streams exist <br />at the mine site and loadout area. <br />The Division has previously authorized EFCI mining operations within <br />buffer zones of large ephemeral streams defined as having drainage areas <br />in excess of one (1) square mile. Relevant operations include mine <br />workings under Newlin Creek, and the loadout surface disturbance <br />adjacent to Oak Creek. <br />Dorchester specifically located mine ponds either outside of the area of <br />mining disturbance or above the main entries and lined the only two (2) <br />ponds which normally contained significant quantities of water with <br />flexible synthetic hypalon liners. These ponds have now been removed <br />and the associated disturbance areas reclaimed. <br />Underground mining activities will not be conducted beneath any aquifer <br />that serves as a significant source of water supply to any public water <br />system. The City of Florence water line was monitored for potential <br />subsidence impacts on a quarterly basis during active operations. EFCI is <br />also ready to implement immediate mitigation measures in the unlikely <br />event that the pipeline is damaged by subsidence. <br />Underground mining will not be conducted beneath or in close proximity to <br />any public buildings or urbanized areas. <br />4.20-2 <br />Revised 6/23/15 <br />MR -68 <br />