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RULE 4 PERFORMANCE STANDARDS <br />5) The monitoring reports and certified inspection reports are available during inspections <br />by the Division but were only submitted to the Division in the Annual Reclamation <br />Reports. <br />On 9/9/97 monitoring of the 6900 well indicated that the steel casing had failed at the 114.3' level <br />allowing water from a pre-existing perched water zone to enter the well at that level. Subsequen <br />monitoring for the next year indicated that the inflow was variable but never completely subsiding. <br />As such, the W690ON well could no longer be relied upon to monitor for development of a perched <br />water zone in the base of the fill. In September, 1998 Colowyo proposed Minor Revision MR -48 <br />to install a new monitoring well on the 6700 bench of the Streeter fill. The W6700 well could <br />serve as the new piezometer well for monitoring purposes (see item #2 in the preceding section). <br />The installation of the well was completed on October 13, 1998 and the as built information <br />submitted through the MR -49 process. Refer to Drawing 30A — Revised Streeter Fill As Built for <br />a location of the Streeter fill wells. Information obtained from the two 6900 wells (drilled in the <br />early eighties) could be of some interest in the future so the two wells will remain in place for <br />possible future monitoring. No formal monitoring program is proposed at this time for the two <br />6900 wells. <br />Streeter Fill Monitoring (2006 forward) <br />In 2006, Technical Revision No. 64 was approved to discontinue all monitoring and reporting <br />requirements for Streeter Fill. This change corresponds to the requirements of Rule 4.09.1 and <br />4.09.2 because all construction has been completed. <br />West Pit and Section 16 Pit Excess Spoil Fills <br />To develop the West Pit and Section 16 Pit, it was necessary to construct two excess spoil fills <br />from material in the initial cuts. The designs detail for these fills is presented in Exhibit 19 — <br />Geotechnical Investigations, West Pit Fill and Section 16 Fill. <br />The volumetric balance indicating excess spoil will be generated and disposal of excess spoil will <br />be required is found in Section 2.05.3. <br />In 2006, Technical Revision No. 64 was approved to discontinue all monitoring and reporting <br />requirements for the Section 16 Fill. <br />4.10 Coal Processing Waste Banks <br />No coal processing waste banks are planned for the Colowyo mining operations. Therefore, this <br />section is not applicable to this application. <br />4.11 Coal Processing Waste <br />Colowyo does not have a coal preparation facility, therefore the requirements of certain parts of <br />this Section are not applicable to Colowyo. <br />Rule 4 Performance Standards 4-36 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />