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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />TOXICITY REDUCTION EVALUATION — LINES OF INVESTIGATION <br />Cost Evaluation <br />based on model simulations that provide detailed sizing information. The BSR design is based on <br />published information and requires bench and field testing to finalize material type and quantities. <br />Table 2. Capital Cost Summary <br />Treatment <br />NF <br />BSR <br />Direct Costs <br />$6,793,000 <br />$5,719,400 <br />Indirect Costs <br />$1,681,000 <br />$1,677,800 <br />Total Estimated Cost <br />$8,474,000 <br />$7,397,200 <br />Total Cost Range (+/- 50%) <br />$4,237,000 - <br />$12,711,000 <br />$3,572,000 - <br />$11,045,000 <br />Itemized details used to develop the cost estimates are presented in Appendix C. <br />Stantec considers these cost estimates to be conservatively high based on the selection of design criteria <br />values (e.g., high flows and concentrations) that are likely to change (i.e., decrease) as more project <br />definition is developed. <br />1.3.1 Value Engineering Opportunities <br />As currently evaluated, the NF membrane separation option is developed with simulation models that <br />provide a higher degree of confidence in the system requirements than the BSR option. Overall, the <br />primary variability in the developed costs is market -based material factors and contractor rates and fees. <br />This option is likely to be implemented without any further testing. Additional siting for the evaporation <br />pond, building, and tanks is required, but that typically occurs over the course of the normal facility design <br />development. <br />Unlike the NF membrane separation option, the BSR bioreactor treatment option has a large degree of <br />opportunity for decreasing the overall costs. Additional investigation and testing could result in the <br />following cost improvements: <br />• Identification of acceptable on -site bioreactor substrate. The current assumption is that it all must <br />be purchased ($2.5M line item at current quarry rates) <br />• Identification of acceptable on -site iron source. The current assumption is for full stoichiometric <br />addition of iron added through scrap metal ($1.25M line item at current scrap cost for light iron). <br />Overall, this represents significant potential savings through further investigations at the site. For each of <br />these items, the means of determining the amount of this cost that is not required can be determined <br />through a drilling program to determine the local geology in the valley area where the bioreactor is <br />assumed to be located. Given that this option will likely require monitoring wells upstream and <br />downstream of the bioreactor, this represents an opportunity to use the same drilling contractor to provide <br />these services. Six borings along the bed area would be used to determine the mineral makeup of the <br />materials in the area to determine whether the rock is suitable for use as bioreactor substrate Samples <br />dpg \\us0321-ppfss011shared_projectsV33001407\reports\4_tre lines of investigationitre lines of investigation_20200320_ifra.docx 3.14 <br />