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Reporting Period December 9, 1997 -December I5, 1997, <br />slope were completed on December 12. No inclinometer surveys were performed this past week. <br />individual areas are discussed in detail in the following sections. Supporting documentation is attached for <br />your review. <br />Lower Svlvester Gulch Road: Slopes are generally snow covered and frozen, making it difficult to <br />inspect ground conditions. However, no "breaks" in the snow cover were observed which would <br />indicate new sloughing. Minor ground water seepage appears to have stopped in conjunction with the <br />frozen ground conditions. Visual monitoring of this slope will continue. <br />Upper Svlvester Gulch Road: The surficial slide on the steepened cut slope at approximately <br />Station 76+00 reported last week continues to waste a small amount of earth into the roadside ditch. <br />The slope is snow covered and frozen with no discernible cracking, and appears to have stabilized for <br />the time being. MCC will continue to monitor this slope and will take appropriate actions to maintain <br />the ditch and road should additional sloughage occur. <br />Main Embankment (F-Wall): Replacement inclinometers for I-9 and I-10 are no~v planned for <br />January. <br />Dewatering Borehole Road: Slopes are snow covered and frozen. Minor water seepage continues <br />on the east side cut slope as reported previously. Survey monuments installed above the cut slope and <br />french drain continue to show a very minor northward creep. Monitoring will continue. <br />Substation Slooe: Visual observations and survey data for the slope above the substation indicates <br />surface movement is continuing, although incremental movements have decreased substantially with the <br />frozen ground conditions. No advancement of the head scarp further upslope and into the Landing #2 <br />Road was observed. MCC will continue to monitor this slope. <br />Shaft Site #1 and #2: Slopes, including the compacted soil buttress installed to stabilize the shallow <br />slope failure on the steep cut slope south of Shaft #1 are snow covered and frozen. No indications of <br />movement were detected. Visual monitoring will continue. <br />Dewaterina Facilities Area (New Reporting Area) Inclinometers I-l3 (below the site) and I-14 <br />(above the site) were not surveyed this week. No movement was visually detected. <br />As of this report, major construction efforts, and particularly all major earthwork efforts have been <br />complete for approximately six weeks. Weekly monitoring and observations of constructed slopes have <br />shown no indication of potential catastrophic or large scale slope failures. In addition, a permanent snow <br />covers now exists over most of the Sylvester Gulch Development area, making visual inspections difficult. <br />MCC believes we have fulfilled the construction related geotechnical monitoring commitments stipulated <br />in Permit Revision 07 and as a result, MCC will submit the final weekly report next week. <br />MCC remains committed to a long term geotechnical monitoring program in Sylvester Gulch, and fully <br />intends to continue to monitor slope conditions, surface survey monuments, and inclinometers on a regular <br />basis. Additional inclinometers and surface survey monuments are also planned, as are additional <br />evaluations of the data collected over the past year. MCC fully expects some repairs and/or slope <br />stabilization efforts may be necessary next spring to ensure long term stability is maintained. Information <br />