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condition comparable to that existing prior to subsidence. The only exception to <br />this being the Thompson Ranch Buildings where liability associated with potential <br />subsidence is expressly limited by the provisions of property transfers. <br />4.20.4 BUFFER ZONES <br />There are no perennial streams or impoundments with storage volumes in excess <br />of twenty acre-feet within the area which would potentially be effected by <br />underground mining activities. In addition, Dorchester specifically located existing <br />ponds either outside of the area of mining disturbance or above the main entries <br />and lined the only two (2) ponds which normally contained significant quantities <br />of water with flexible synthetic hypalon liners. These ponds have now been <br />removed and the associated disturbance areas reclaimed. <br />Underground mining activities will not be conducted beneath any aquifer that <br />serves as a significant source of water supply to any public water system. The <br />City of Florence water line was monitored for potential subsidence impacts on a <br />quarterly basis during active operations. EFCI is also ready to implement <br />immediate mitigation measures in the unlikely event that the pipeline is damaged <br />by subsidence. <br />Underground mining will not be conducted beneath or in close proximity to any <br />public buildings or urbanized areas. <br />TR-36 4.20-2 Revised -October 2003 <br />