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M M 1=1 M r <br /> Homestake Mining Company <br /> Pitch Reclamation Project 2018 Geotechnical Observations <br /> Indian and Tie Camp Waste Rock Dumps <br /> Table 1: Seasonal Water Level Readings in Rock Dump Piezometers <br /> 00 Level of IRD 10000 Level of IRD <br /> Location <br /> r. � �.r� � � r- r .r � ��. •z. i. -. i -. is -. r• -. � -. � •. , -. r• -. r ■ <br /> Ground Surface <br /> i. r r.i :� r .r� r .r r r- r r r r r r• i r• r• rr• .r rr• •i rr• ��.� ��.. , �, <br /> High Flow 2017 10436.5 10363.8 10301.2 10185.7 10156.2 10125.0 10114.2 10115.0 10115.7 10100.1 10028.3 10027.3 10028.7 10025.2 10025.8 10210.1 <br /> Low Flow 2017 10431.1 10356.7 10297.6 10184.1 10154.9 10116.4 10110.4 10117.2 10119.8 10116.5 10024.5 10027.3 10024.7 10021.4 10027.9 10206.6 <br /> High Flow 2018 10451.5 10357.3 10303.2 10183.7 (b) 10117.7 10114.6 10113.6 10118.6 10117.5 10030.0 10024.6 10025.1 10022.5 10025.6 10207.3 <br /> Low Flow 2018 10432.7 10355.7 10296.6 10177.6 (b) 10116.0 10119.7 10113.7 10158.0 10115.5 10022.0 10022.7 10022.0 10020.5 10026.7 10205.2 <br /> Notes: <br /> ft amsl=feet above mean sealevel <br /> Piezometer Type: <br /> M=Monitoring <br /> I=Injection <br /> E=Extraction <br /> High-flow monitoring typically occurs in late May of each year <br /> Low-flow monitoring typically occurs in early October of each year <br /> Injection wells were monitored outside of typical high-flow monitoring period <br /> (a)-Estimated casing height of piezomeler used due to lack of survey data <br /> (b)-Water level not taken due to obstruction in the piezometer <br /> Pitch Reclamation Project Page 7 <br /> 2018 Annual Geotechnical Report <br /> M-1977-004HR <br />