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XVIII. Bonding - Rule 3 Information on bond is contained in Section 3.0 and Exhibit 20. EFCI currently has bond in the amount of E1 ,105,000 posted for reclamation liability. A review of the operation's liability was conducted. Due to changes in the proposed reclamation plan and revised cost estimates, the current bond was found to be in excess of the worst-case liability for the mine. As a result, the Division finds that bond for the Southfield Mine may be reduced to E811,000.00, The operation is in compliance with the requirements of this section. XIX. Sealingg of Drilled Holes and _Underground Openings -_Rules 2.05,4(2)(8) a~+[~O --------- - - - - - - Drill holes from 1987 and 1988 exploration projects within have been filled and sealed, as described in the "Proposed Bond Release" Document dated September 15, 1990. Section 4.07.3 of the MRP contains a description of portal Mine portals are to be sealed by means of keyed in concret 25 feet of cover material, in compliance with requirements 30 CFR 75.1711. There are no other changes in this section. the permit area Decision, Phase I sealing plans. block wal 1 s behind of the Division and The operation is in compliance with the requirements of this section, XX. Subsidence - Rules 2,05.6(6) and 4.20 Information on subsidence monitoring and control is contained in Section 2.05.6 (pages 55-66) and Exhibit 23. The operator has been conducting subsidence monitoring in accordance with the plan approved when the mine was permitted. An initial study conducted for the mine predicted probable maximum subsidence depths of 1,46-3.22 feet. During the past seven years, subsidence due to the Southfield Mine has been measured at depths of 0.03-2,19 feet. Since these depths are within the projected occurrences, the Division approved the applicant's request to reduce the monitoring frequency of some subsidence monuments from quarterly to semi-annually. Semi-annual monitoring will be performed for the south subsidence grid and the Newlin Creek streambed. The Florence water line and Thompson Ranch structures will continue to be monitored quarterly, No structures or renewable resource lands were identified in the expanded permit area. Therefore, no new subsidence monitoring is required in this area. This section of the original Findings Document contained two stipulations. Stipulation No. 10 required the operator to monitor the location and orientation of the Thompson Ranch structures quarterly. The operator has been performing this monitoring on a quarterly basis and has made a commitment within the permit to continue doing so. Therefore, this stipulation is no longer necessary. _P2_