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Mr. Ed. Baker <br />April 18, 2003 <br />Page 6 <br />temperature, concentration or flows. If the fourth cable at 115 ft above the Dissolution Surface <br />(or approximately 2 ft above the L-5/R-6 contact) fails, the cavern will be shut-in, <br />EPABLM/CDMG will be notified, and at least a section of the cavern will be abandoned. <br />Mining may continue, in portions of the cavern with the approval of the agencies after: <br />1. Moving the injection and recovery points so that the area impacted by the subsidence <br />recorded by the SMW is not further undermined, or <br />2. Drilling new injection and recovery wells into portions of the cavern that are not well <br />developed and have shown no signs of subsidence from nearby Dissolution Surface <br />monitoring wells or other injection production wells, and <br />3. Constructing a new SMW located above the length of the cavern to be mined, or <br />4. The cavern is abandoned. <br />In the above discussions, cable failure implies that the cable has been compromised either <br />by mechanical rock movement, such as sheaz or elongation, or by water saturation. If a shorter <br />cable is compromised, while a longer cable functions correctly, then the output of the shorter <br />cable will be disregarded and be assumed to be a faulty cable with the fault unrelated to <br />mechanical deformation of the cable. Failure of the cable, due to rock deformation, should be <br />preceded by spikes or deviations in the return signal. This should provide an indication of <br />ground movement in anticipation of cable failure. Such precursors of cable failure will be <br />reported to EPABLM/CDMG. After such readings are confirmed by repeat observations over a <br />10-day period, cable failure will be reported to the EPABLM/CDMG in writing within 5 days of <br />earliest detection. <br />Sincerely yours, <br />~;-' V ~ L'tv~J <br />Michael Hardy <br />President <br />MPH/smb <br />Attachment (1) <br />Agapito Associates, Inc. <br />