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The half-culvert suspended over the surface subsidence in the <br /> water diversion trench south of the Fake Emma hole appears to be <br /> transporting the drainage water past the subsidence as intended. <br /> Some settlement was observed through the year but not nearly as <br /> much as expected. Plans are to continue observing the site for <br /> settlement with permanent repair to probably take place during <br /> the reclamation of the Lake Emma hole:'-'"_ <br /> Subsidence monitoring above the open pits was continued. Survey <br /> results are included in Append--ix A. No major movement has taken <br /> place although some of the results are erratic. Further <br /> monitoring is required for evaluation of results. Planned <br /> activity for 1990 in Sunnyside Basin includes the following: <br /> (1) Removal of the road constructed to the No Name portal and <br /> permanent closure of the portal . In the reclamation plan <br /> (TR 07) for the No Name, only the new road was to be removed <br /> but the old road serves no useful purpose and will be <br /> removed below the No Name portal . <br /> (2) Permanent closure of the Sunnyside portal. through <br /> backfillinq as committed to in TR-07 . <br /> (3) Treat the waste rock stockpiles with ProMac in June and <br /> October and monitor the effectiveness of this treatment as a <br /> temporary acid mitigation plan. <br /> (4 ) Monitor the revegetation test plot and the results of <br /> seeding the overburden stockpiles. <br /> (5) Monitor the subsidence in the diversion trench for <br /> stability. <br /> (6) Submit a Technical Revision request for permanently sealing <br /> the hole in the Sunnyside Open Pit floor and perform the 1 <br /> work. �% <br /> (7) Work with the MLRD on approval of a reclamation plan for at\ ry M <br /> least one of the open pits . ! t <br /> Tailings Pond #4 Area - Plate No. 3 <br /> The construction method for Tailings Pond #4 was changed as <br /> outlined in TR-09 and the water recycle system was operational <br /> for a portion of the reporting year . <br /> The monuments for monitoring settlement were set during the last <br /> quarter of 1989 after completion of construction and were <br /> surveyed during the lst quarter of 1990 as part of the stability <br /> monitoring plan. The results will be submitted to Knight - <br /> Piesold and Co. for evaluation as committed to for Stipulation <br /> .No. 12 of the approval for TR-09. The survey data is included in <br /> _ Appendix A for review. Cursory review of the data gives the <br /> impression that movement has been minimal . The vibrating wire <br /> piezometers are scheduled for placement after the drainage net <br /> placement is complete. <br /> -4- <br />