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patch. A mechanical integrity test will be performed prior to reactivating the <br /> production well. <br /> Daily records will be kept to monitor injection fluids and production solutions. A mass <br /> balance will be conducted on each production well to demonstrate cavity integrity, <br /> containment of solution mining fluids and cavity size as discussed in Section 8.3 <br /> Solution Cavity Integrity/Growth. <br /> These mechanical integrity and other data will be reported on a quarterly basis in the <br /> form of a comprehensive report that will be submitted to EPA and BLM 30 days after <br /> the end of each quarter. <br /> U-3.1.2 Subsidence <br /> In the area of the Rock School Lease there has been significant natural dissolution of <br /> subsurface saline minerals that once occupied the leached zone. Subsequent to <br /> their dissolution, numerous dissolution features have resulted along with localized <br /> and regional subsidence of surface and subsurface materials. Any potential surface <br /> expression of subsidence resulting from the solution mining operations will be <br /> determined by a comprehensive monument and topographic survey. The survey will <br /> include the installation of surface monument devices which will be accurately <br /> surveyed with respect to a permanent reference monument which will be located on <br /> each production well. These sites will be surveyed annually, commencing with the <br /> first pilot plant production cavity. AmerAlia does not expect any subsidence as a <br /> result of their experimental pilot project. <br /> Any casing failure due to ground movement will be detected by the use and <br /> comparison of gamma logs. In addition, the total depth of the well bore will be <br /> determined by drilling measurements and if necessary wireline geophysical logs <br /> such as cement bond and casing collar locator may also provide data regarding the <br /> extent of potential subsidence. <br /> U-3.1.3 Well Failure <br /> Every precaution will be taken to minimize well failures. Some of these precautions <br /> are as follows: <br /> • Perform MIT of the well bore casing prior to production of mining fluids. <br /> G:%LMtM78545.00ZReclamation\Reclamexh.DOC U-5 <br />