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• condition comparable to that existing prior to subsidence. The only <br />exception to this being the Thompson Ranch Buildings where liability <br />associated with potential subsidence is expressly limited by the <br />provisions of property transfers. <br />4.20.4 BUFFER ZONES <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. In addition, Dorchester <br />specifically located existing ponds either outside of the area of mining <br />disturbance or above the main entries and has lined the only two (2) ponds <br />which normally contain significant quantities of water with flexible <br />synthetic hypalon liners. <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 is monitored for potential <br />subsidence impacts on a quarterly basis. EFCI is also ready to implement <br />immediate mitigation measures 1n the unlikely event that the pipeline is <br />damaged by subsidence. <br />Underground mining will not be conducted beneath or in close proximity to <br />any public buildings or urbanized areas. <br /> <br />4.20-2 <br />