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Privileged and Confidential—Attorney Client Communication V eosy Cec ` <br /> consultants <br /> Process Treatment Objective Design Considerations and Items <br /> to be Further Evaluated <br /> • Chemical feed capability at end of . Evaluate design considerations for <br /> MWP allow modifications to effluent coagulation,flocculation,and <br /> water quality to enhance sedimentation using jar testing and <br /> performance of engineered wetland a pre-engineered pilot-scale unit <br /> as needed: adjust pH,add organic <br /> carbon,add trace nutrients <br /> • Filter water to remove suspended • Aerobic wetland in expanded area <br /> solids prior to SRB at the end of the MWP and <br /> • Remove some metals(iron, overflowing into Pond#2 <br /> manganese primarily)by oxidation • Construct using gravel, sand, and <br /> and precipitation native wetland plants(A Summary <br /> • Carbon source prior to SRB of Passive and Active Treatment <br /> Technologies for Acid and <br /> Transitional Metalliferous Drainage(AMD), <br /> Aerobic 2005) <br /> Wetland • Evaluate liquid depths that will <br /> maintain aerobic conditions <br /> • Maintain compliance with Army <br /> Corp of Engineers water surface <br /> area requirements for MWP <br /> • Consider the periodic removal of <br /> filtered solids in the design and <br /> operation planning <br /> • Biological reduction of sulfate to • Gravel-filled SRB with a limestone- <br /> sulfide and subsequent precipitation buffered organic treatment media <br /> of metal sulfides that requires minimal <br /> • Alkalinity increase due to biological operation/maintenance(ITRC, <br /> sulfate reduction and dissolution of 2010) <br /> limestone • Maintain anaerobic conditions; ice <br /> • Precipitation of metal hydroxides on SRB surface is beneficial <br /> Pond#2 • Sorption of trace metals to metal • Gravel, limestone,wood chips, corn <br /> SRB hydroxides and organic media stover, manure(for inoculation) <br /> (Reisman, Rutkowski, Smart, <br /> Gusek, & Sieczkowski,2009) <br /> • Siderite for iron source may be <br /> necessary pending the results of the <br /> pilot-scale testing <br /> • Depth: built at least 3-4 ft deep and <br /> greater depths may be necessa in <br /> Treatability Study Work Plan 12 February 8,2018 <br />