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Homestake 2006 Geotechnical Observations <br />Pitch Reclamation Project Indian Creek and Tie Camp Creek Waste Rock Dumps <br />approximately 229 feet. Data from IC10600 showed a maximum seasonal fluctuation <br />of 1.5 feet. <br />d) "10600 - 10400" Level <br />Site Description: Identical to that of past reports for 1996 through 2005. <br />2006 Observafions: Piezometer IC10440 was located in this area; however, it was lost <br />in September 1996. Piezometer IC10525 can also be considered to be within the area. <br />The 2006 data for that piezometer is described above. <br />e) "10400 -10370" Level <br />Site Descr~tion: Identical to that of past reports for 1996 through 2005 <br />2006 Observations: The 2006 observations are similar to those reported in the past. <br />Piezometer IC10360 is located in this area. Water levels in this piezometer averaged <br />about 225.2 feet bgs, with a seasonal fluctuation of approximately 10.7 feet. The <br />maximum water level for 2006 returned to levels observed in preceding years. The <br />total depth of this piezometer is 260 feet and the thickness of the dump is <br />approximately 240 feet. <br />Piezometer IC10370 is also located in this area. In 2006, water levels in this <br />piezometer show little season fluctuation with an averaged water level of 190.6 feet <br />bgs and a seasonal fluctuation of 0.7 feet. The bottom of this piezometer is 192 feet <br />bgs. <br />During 1997, Homestake reconstructed the face of the permanent low-grade <br />stockpile located on the Indian Creek Waste Rock Dump. The purpose of the slope <br />reconstruction was to reduce the potential for infiltration and promote more rapid <br />runoff from the slope. No seepage was observed in this area in 2006. <br />f) "10300 -10100" Level <br />Site Description: The Indian Creek Waste Rock Dump was regraded in 1994 <br />following procedures approved in the February 1994 Technical Revision. During <br />1995, several minor, localized areas of slope instability were noted, corrected, and <br />reported in the 1995 Annual Geotechnical Report. <br />2006 Observations: Visual observations indicate that the repairs performed in 1995 <br />were successful and no new areas of surficial instability (slips) were observed from <br />1996 through 2006. Piezometer IC10300 is located in this area. In 2006, water levels <br />in this piezometer averaged 189.1 feet bgs, with a maximum seasonal fluctuation of <br />approximately 8.7 feet, consistent with maximum water level observed in preceding <br />years. <br />2. Tie Camp Waste Rock Dump <br />a) "10400 -10100" Level <br />Site Description: The Tie Camp Waste Rock Dump was regraded in 1994 following <br />procedures approved in the February 1994 Technical Revision. During 1995, minor, <br />Homestake Pitch Reclamation Project Page 2 <br />2006 Annual Geotechnical Report December 15, 2006 <br />M-1977-004HR 2006ReportTe# FINAL <br />