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Homestake Mining Company 2017 Geotechnical Observations <br /> ' Pitch Reclamation Project Indian and Tie Camp Waste Rock Dumps <br /> ' Table 1: Monthly Water Level Readings in Rock Dump Piezometers <br /> ' Location Indian Tie Cam <br /> Ground Surface 10631.50 10603.80 10523.60 10380.50 10373.40 10297.80 10373.00 <br /> Elevation ft amsl <br /> DATE 10630 10600 10525 10370R 10360 1030OR TC10375 <br /> 12/15/16 201.90 252.36 228:80 201.00 223.76 188.63 1 169.10 <br /> 1/15/17 201.90 252.34 228.76 201.24 224.12 186.60 169.20 <br /> 2/4/17 202.00 252.30 228.70 201.20 225.00 187.20 169.20 <br /> ' 3/18/17 202.0E 252.10 228.60 201.45 225.10 187.30 169.25 <br /> 4/4/17 201.26 250.00 226.50 199.20 223.10 185.13 167.10 <br /> 5/10/17 196.20 246.14 220.56 196.30 219.23 181.67 1 164.80 <br /> ' 6/1/17 195.02 244.00 224.40 196.68 219.72 181.93 164.92 <br /> 7/11/17 196.00 247.87 225.64 197.43 218.86 182.10 165.27 <br /> 8/17/17 197.62 249.50 226.72 197.64 219.03 183.56 166.56 <br /> 9/12/17 198.67 249.74 227.72 198.27 220.68 188.98 167.92 <br /> 10/11/17 200.40 251.13 1 228.00 198.32 221.02 190.56 168.36 <br /> 11/20/17 200.76 251.85 228.00 198.75 222.00 190.61 168.63 <br /> 12/4/17 200.82 251.87 228.23 199.80 222.36 190.58 168.72 <br /> Average Feet Below 199.58 250.09 226.97 199.02 221.84 186.53 167.62 <br /> Ground Surface (ft bgs) <br /> 2016 Maximum 7.61 8.40 7.90 5.55 8.80 7.21 6.01 <br /> Differential (ft bgs) <br /> 2017 Maximum 7.03 8.36 8.24 5.15 6.24 8.94 4.45 <br /> Differential (ft bgs) <br /> Notes: <br /> Readings in red reflect the highest water level reading in ft bgs <br /> Readings in green reflect the lowest water level reading in ft bgs <br /> ft bgs=feet below ground surface <br /> ft amsl=feet above mean sealevel <br /> 1 <br /> Pitch Reclamation Project Page 7 <br /> 2017 Annual Geotechnical Report <br /> M-1977-004HR <br />