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December 1986 11 863-2060 <br />• <br />4.4.1 Area 1 Instabilit <br />Based on an August 9, 1984 correspondence from CYCC to the MLRD, <br />minor slumping had occurred in a portion of Area 1 each spring <br />since the area was reclaimed in 1981 (CYCC, 1984). Additionally, <br />Area 1 instability was recently described in a November 14, 1986 <br />correspondence to the MLRD (YVCC, 1986). <br />Three relatively small slumps located near the mine spoil toe <br />northwest of Middle Creek are described in these documents. <br />Slumps A and B are reported to comprise areas of 0.32 acres and <br />0.14 acres, respectively. As reported in the 1984 correspon- <br />den~e, displacements of 2 to 4 feet and average head scarps of 2 <br />feet were measured. The ground surface near the head of slumps A <br />and B slopes at a gradient of approximately 35 percent (19 de- <br />grees). Slump A occurred in regraded mine spoil, while slump B <br />• occurred in weathered shale in an area that was never mined. The <br />limits of slump C are obscure and have not been delineated. <br />A total of six springs/seeps have been identified in the immedi- <br />ate vicinity of these slumps. Although no ground-water discharge <br />was observed in this portion of Area 1 during the December 1986 <br />field investigation, cattails were noted adjacent to each slump. <br />Based on December 1986 observations, slumps A and B appear to be <br />surficial failures which are very limited in their vertical and <br />lateral extent. <br />• <br />Golder Associates <br />