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Praileged and Confidential Attorney Client Communication Geos ``tec <br /> Conytiltdnts <br /> Table 9: Bench-Scale Testing for Physical Metal Removal <br /> Item Design Parameter to be Tested <br /> • Test 2 iron-based coagulants <br /> o Coagulant 1: ferric chloride <br /> o Coagulant 2: ferric sulfate <br /> 1 Coagulant • 3 Dosages <br /> o Dose l: 5 mg/L <br /> o Dose 2: 15 mg/L <br /> o Dose 3: 30 mg/L <br /> pH • Test design pH range 8-1 1 <br /> 2 Adjustment . p ( ) <br /> J 3 H levels ambient, 9-10, 10-I l <br /> • Rapid mixing from pipeline, followed by settling <br /> o G value 1: 700 Us <br /> • Rapid mixing from pipeline and static mixer, followed by settling <br /> 3 Mixing Energy o G value 2: 1000 1/s <br /> • Rapid mixing from pipeline, followed by slow mixing(to simulate <br /> baffles in MWP) <br /> o G values: 700 1/s, 30-40 1/s <br /> A total of two 6-jar tests will be performed during each flow condition to evaluate these <br /> parameters for the best operating conditions. Temperature of the water will mimic the <br /> temperature conditions at the Mine as closely as possible. Coagulant type, coagulant <br /> dose, mixing energy, and pH adjustment will be evaluated, and their associated jar tests <br /> are listed in Table 10. The first test will be completed initially to determine the <br /> coagulant that performs best between the two and to select an appropriate dose for the <br /> second tests involving the different mixing energies. Additional jar testing may need to <br /> be conducted, depending on how many variations in sample quality need to be tested <br /> and additional design variables that may need to be assessed according to the testing <br /> results. <br /> Treatability Study Work Plan �� _ ��� 16 February 8,2018 <br />