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Mr. Himanshu Mehta, P.E. Managing Director 11 February 2019 Page 4 requirements. Geosyntec has assumed that SWDD will directly contract the sampling and analytical testing with Ideal Technical Services (ITS) and ENCO Laboratories, Inc. (ENCO), respectively. The results of the testing will be provided to Geosyntec in electronic format to expedite the review process. Geosyntec will also need updated information on the leachate, RDF centrate, and combined lift station flow rates to make sure that there are no significant changes from those reported in the CDM Smith Report. Phase 3 — Evaluation of Liquids Management Options Geosyntec will compile the pertinent data, including the latest analytical data from the three samples and updated flow rates, and conduct a thorough evaluation of this information with respect to: (i) liquid chemistry and treatability; (ii) potentially applicable treatment options and relative costs of these options; (iii) local limits requirements of the WRWWTF; and (iv) feasibility of separating the landfill leachate from the centrate to meet pre-treatment and/or disposal requirements. Based on a preliminary review of the CDM Smith Report, the landfill leachate has exceedances of the local limits for arsenic, total dissolved solids (TDS), and total nitrogen (including ammonia). Depending on the results of the proposed sampling of the three liquids, it is anticipated that the following treatment options will be evaluated: (i) biological treatment using SBR system; (ii) RO membrane system; and (iii) advanced oxidation. Each of these treatment options will be evaluated with respect to the chemical constituent(s) targeted for removal. For example, the biological treatment system is typically used to remove ammonia and other nitrogen compounds whereas RO will be focused on reducing the TDS concentration. In addition, leachate volume reduction via on-site evaporation (using waste heat and/or landfill gas combustion systems) will be evaluated with specific focus to the landfill leachate. Another potential option is with the use of "Vetiver grass" which is known to be tolerant of elevated salt ammonia concentrations (typically found in landfill leachate) and has some extensive root systems capable of high moisture uptake. It is generally used for on-site management (i.e., irrigation) of leachate rather than pre-treatment for subsequent discharge to a POTW. The number of options to be evaluated will be discussed and agreed with SWDD and IRCUD following review of the analytical data on the three liquid samples. The evaluation of each alternative will include feasibility level cost estimates (capital, installation and O&M) for major items required for implementation of each treatment/management option. Additionally, the evaluation will include non -economic aspects, such as ease of implementation, including permitting and regulatory hurdles, the complexity of the system, robustness of the system, and other requirements. The need for a batch or pilot test program to further evaluate the viability of a treatment option will also be included. The engineers 1 scientists 1 innovators