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Homestake 2004 Geotechnical Observations <br />Pitch Reclamation Project Indian Creek and Tie Camp Creek Waste Rock Dumps <br />f) "10400 - 10370" Level <br />Site Description: Identical to that of past reports for 1996 through 2003 <br />2004 Observations: The 2004 observations are similar to those reported in the past. <br />Piezometer IC10360 is located in this area. Water levels in this peizometer averaged <br />about 227.9 feet bgs, with a seasonal fluctuation of approximately 12.0 feet. The <br />maximum water level for 2004 returned to levels observed in preceding years. The <br />total depth of this peizometer is 260 feet and the thickness of the dump is <br />approximately 240 feet. <br />Piezometer IC10370 is also located in this area. Water levels in this piezometer have <br />averaged 190.7 feet bgs, with a seasonal fluctuation of 0.4 feet for 2004. The bottom of <br />this piezometer is 192 feet 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 2004. <br />g) "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 />2004 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 2004. Piezometer IC10300 is located in this area. Water levels in this <br />peizometer averaged about 189.8 feet amsl, with a maximum seasonal fluctuation of <br />approximately 5.4 feet. The maximum water level for 2004 was back in line with <br />those observed in preceding 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 />localized areas of slope instability were noted, corrected, and reported in the 1995 <br />Annual Geotechnical Report. <br />2004 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 2004. Piezometer TC10375 monitors the Tie Camp Creek Waste Rock <br />Dump. Water levels averaged 171.8 feet bgs, with a maximum observed seasonal <br />fluctuation of 3.2 feet during 2004. <br />Homestake Pitch Reclamation Project Page 2 <br />2004 Annual Geotechnical Report December 30, 2004 <br />M-1977-004HR 2004 WRD Geotech Report <br />