2021-01-04_GENERAL DOCUMENTS - C1981019

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DocuSign Envelope ID: EBE28081 -B782-4B42-BADB-D8C93B687B1 B TOXICITY REDUCTION EVALUATION — LINES OF INVESTIGATION Cost Evaluation As is the case for the capital expenditure, the operation of the membrane separation facility is a well - established approach, including material consumption. The propane usage is based on a set of bird and wildlife cannons that would need to be managed around the evaporation pond. Additional water management options will be evaluated if the NF option is selected for further design. Waste haulage is listed as a daily operation but is actually an annual campaign activity performed on alternating cells in the fall. This is expected to be covered by existing personnel on site. An allowance for mechanics and electricians for plant maintenance is included, but environmental sampling and site engineering oversite is assumed to be within the capacity of the operating mine site staff. Table 4. BSR Bioreactor Treatment Operational Cost Estimate Labor Costs Role Quantity Contractor Rate Annual Cost Senior Engineer/Microbiologist 0.25 $120 $62,400 Senior Operator 0.25 $95 $49,400 Mechanics 0 $80 Existing Electricians 0 $80 Existing Environmental 0 $85 Existing Administrative Staff Existing Subtotal Labor $111,800 Power and Miscellaneous Costs Description Rate Value Daily Annual Cost Power $0.064 670 kW-hr/day $12.17 $15,653 Reagents Ethanol (100%) $1.45 546 gal/day $791.70 $288,971 ZVI Powdered (30% load) $0.56 509 lb/day $284.95 $104,005 Weekly Water Testing $26,000 Waste Haulage Not required Maintenance (1 %) $53,779 Subtotal Power and Miscellaneous $488,407 Annual Total $600,207 The design intent for the bioreactor is to be a passive system that does not require regular operational staff. Labor included is for periodic checks on equipment and periodic consulting hours for a microbiologist or bioreactor engineer throughout the year to assess the ongoing performance of the system. A 500-hour allowance for this periodic activity is considered to be conservatively high. Unlike the NF membrane separation option, mechanical and electrical support is assumed to be within the current capacity of the site staff given that the number of motors and electrical equipment is drastically reduced in comparison. The allowance for Zero Valent Iron (ZVI) powder that is provided assumes fouling of 30% of the material that is placed into the bioreactor media bed. Although this fouling may not occur in the early stages of operation, it is likely to occur overtime. dpg \\us0321-ppfss011shared_projectsV33001407\reports\4_tre lines of investigationitre lines of investigation_20200320_ifra.docx 3.16