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Homestake Pitch Reclamation Project <br />2006 Geotechnical Observations <br />Indian Creek and Tie Camp Creek Waste Rock Dumps <br />1. Indian Creek Waste Rock Dump <br />a) "IOS00" Level <br />Site Description: Identical to that of past reports for 1996 through 2005. <br />2006 Observations: The 2006 observafions are similar to those reported for this area <br />during the past ten years. Visual inspection of the area has revealed no evidence of <br />settling or slumping of the dump material in 2006. Drainage channels are <br />functioning as designed. <br />b) "10780-10650" Level <br />Site Description: Identical to that of past reports for 1996 through 2005. <br />2006 Observations: The 2006 observations are similar to past observations. Visual <br />inspecfion of the area has revealed no evidence of settling or slumping of the dump <br />material in 2006. Drainage channels are functioning as designed. <br />c) "10650 -10600" Level <br />Site Description: Identical to that of past reports for 1996 through 2006 <br />2006 Observations: In October 2001 an obstruction was removed from Piezometer <br />IC10600, allowing it to be used for the collection of piezometric surface data. In June <br />of 2005, a level fluctuation of 9.0 feat was observed in this Piezometer, which was the <br />greatest fluctuation in water elevation since the obstruction was removed. The water <br />level dropped back to its normal range the following month, a condition similar to <br />other piezometers on the Indian Creek dump and deemed as an acceptable seasonal <br />variation. This water level increase in June of 2005 cvas likely a result of a very wet <br />spring following drought conditions in 2001 through 2003. The water levels in 2006 <br />dropped back to a more consistent range with a total increase of 1.5 feet and an <br />averaged level for the year of 252.2 feet below ground surface (bgs), more in line <br />with the readings from 2001 through 2004. <br />"10725 -10525" Level <br />Site Descr~tion: Identical to that of past reports for 1996 through 2005. The minor <br />overlap between this level and other bench designations reflects the original bench <br />configuration. <br />2006 Observafions: piezometers IC10600 and IC10525 bound this area. The seasonal <br />maximum water level fluctuation observed in IC10525 was 6.5 feet and a water level <br />average through the year of 227.6 feet bgs, in a total dump thickness of <br />