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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />TOXICITY REDUCTION EVALUATION — LINES OF INVESTIGATION <br />Cost Evaluation <br />Bioreactor development consists of modification of existing remediated areas development of a collection <br />system. The BSR bioreactor approach relies on using the existing site topography to promote gravity flow <br />through the system, locating the systemin the valley to the north of East Taylor Pond. This design is <br />summarized by the following: <br />• Installation of a diversion channel for segregation of subsurface and surface flows <br />• Collection and isolation system for East Taylor Pond <br />• Lined subsurface bioreactor <br />• Ethanol storage tanks <br />• Pump and reagent storage building. <br />3.2 ESTIMATE CLASSIFICATION <br />This cost estimates that are prepared is considered a Class 5 estimate as defined by the Association for <br />the Advancement of Cost Engineering International (AACEI). The expected accuracy ranges for this level <br />of definition is +/- 50% and is provided in the cost summary pages. <br />3.2.1 Cost Estimating Methods <br />The NF membrane separation cost estimate is prepared using the "bottom rolled up" method with a <br />breakdown of materials and equipment items. Construction and design costs were estimated using <br />factors derived from OneMine. Vendor quotations were obtained for major items. The estimates include <br />cost allowances and dollars per square foot for certain components in the design. <br />The BSR bioreactor treatment cost estimate was also prepared using the "bottom rolled up" method with <br />a breakdown of labor, materials and equipment based on local labor rates and material quotes. This cost <br />estimate includes allowances based on historical information as a substitute for vendor quotes. <br />Building costs are a factor of R.S.Means 2019 average values. <br />Taxes, fees, easements, escalation, and administrative tasks are not included in these cost estimates. <br />All costs are presented as raw quoted costs with an accuracy range of +/- 50%. <br />Itemized costs and assumptions used in the development of these estimates are summarized in <br />Appendix C. <br />3.3 CAPITAL COSTS <br />Overall, the capital cost evaluation is similar between the two options and is summarized in Table 2. <br />Capital Cost Summary. However, the NF membrane separation cost is more defined given that it is <br />dpg \\us0321-ppfss011shared_projectsV33001407\reports\4_tre lines of investigationitre lines of investigation_20200320_ifra.docx 3.13 <br />