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EFCI has purchased and maintains on-site 70 feet of 12-inch PVC pipe to serve as <br />replacement pipe in the unlikely event of breakage due to Southfield operations. EFCI <br />will repair or replace appropriate sections of the water line which are clearly shown <br />by the monitoring program to have been damaged by subsidence resulting from <br />Southfield mining operations. EFCI will continue to work closely with the City of <br />Florence in all aspects of these monitoring and repair commitments. In addition, EFCI <br />will cooperate where possible in planning efforts for along-term water supply for the <br />City of Florence. <br />Subsidence Survey <br />The subsidence survey section of the Subsidence Survey, Subsidence Monitoring, and <br />Subsidence Control Report prepared by RMG in 1983 is still valid for the Southfield <br />Mine. The RMG report covers all sections as specified by Rule 2.05.6(6). The <br />subsidence survey program developed by RMG is presented in Exhibit 23, Subsidence <br />Information. The survey plan details predicted subsidence, planned mining methods, <br />geologic properties, local mining experience relative to resulting subsidence, and a <br />description of predicted subsidence phenomenon. <br />• The angle of draw in the permit area has been predicted by RMG and measured by <br />EFCI. The angle of draw range predicted by RMG in 1983 was 20 to 25 degrees. The <br />apparent angle of draw measured by EFCI varies between 19 and 29 degrees and <br />compares favorably with original RMG predictions. The apparent angle of draw is <br />based on observed subsidence, as measured by EFCI, ranging between 0.05 and <br />2.31 feet. RMG predicted the angle of draw based on probable subsidence ranging <br />from 1.46 feet to 5.85 feet and a projected worst-case vertical subsidence range of <br />2.60 to 4.36 feet. <br />The location of proposed mine workings and the areal extent of affected surface areas <br />as defined by a predicted maximum angle of draw of 29 degrees has been illustrated <br />on the Mine Plan Map, (Map 17). The extent of disturbance is based on projected <br />mine production during the next five (5) years and a maximum angle of draw of 29 <br />degrees. <br />• <br />2.05.6-66 Revised 2/23/96 <br />Technical Revision No. 24 <br />