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Privileged and Confidential—Attorney Client Communication Geos tee Q <br /> consultants <br /> 2.2.1 Bench-Scale Source Water <br /> During collection of waters for jar testing for the CSM lab, source waters were taken <br /> with extremely high turbidity levels by stirring sediment in the tunnel ditch manually <br /> and capturing those entrained sediments in the water sample which presented a <br /> challenging water quality condition possibly representative of high flow conditions <br /> during operations and not potential median source waters might be during the project. <br /> The use of this"manufactured"source water for jar testing presents an extreme water <br /> quality challenge when factored with high flow conditions. <br /> 2.2.2 Bench-Scale Coagulation/Flocculation/Settling <br /> The results from this phase of the bench-scale testing were used to support the design of <br /> the coagulation, flocculation, and sedimentation treatment steps in further testing of the <br /> pilot system. A total of three jar tests were completed during this jar testing phase using <br /> a water sample from low-flow conditions (Source Water 1) and a representative high- <br /> flow water sample (Source Water 2). Each jar test consisted of six jars representing <br /> different conditions to test coagulant dose and pH adjustment on their ability to remove <br /> turbidity,total metals,and dissolved metals. A photo of the jar testing apparatus is shown <br /> in Figure 4. <br /> N Sr, <br /> 1! <br /> 1 :, <br /> Figure 4:Jar Testing Apparatus for Jar Test 1.The first three jars use Source Water I and the <br /> second three jars use Source Water 2. <br /> A ferric chloride coagulant was used,and mixing speeds were set to mimic the conditions <br /> of a full-scale system. A summary of each jar test condition is shown in Table 7. <br /> I i ltdI ility I Rcport 10 December 11,2018 <br />