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*The construction period schedule indicated supports completion of earthwork & utilities; <br />based on similar projects, we expect an additional 12 months to support planting and <br />vegetation maintenance activities <br />TASK 10 — NITRIFICATION SYSTEM DESIGN <br />This task will be completed concurrently with other design tasks (Tasks 3, 6 and 7). The specific <br />subtasks will be authorized at the same time as the relevant other tasks. <br />The City Water Pollution Control Plant (WPCP) effluent requires upstream nitrification before <br />the plant effluent is routed to the proposed 4.3 -acre denitrification treatment wetland system. <br />The assessment/screening of a range of available nitrification technologies, conceptual system <br />design and sizing options; and site configuration layouts will be explored with the City. The <br />system/technology evaluation, assessment of a range of conceptual design options, comparison <br />of construction/installation costs, and final engineering design/preparation of construction <br />documents for the recommended upstream nitrification process facility will be conducted in <br />accordance with the following Scope of Work. <br />Among the various options that will be evaluated, Terraphase will consider application of both <br />Moving Bed Biofilm Reactor (MBBR) or Membrane Aerated Biofilm Reactor (MABR) <br />technologies. Both processes are well suited for nitrification and organic load reduction <br />(BOD/COD) and provide higher nitrogen removal performance than conventional wastewater <br />treatment systems. These processes combine attributes of activated systems with fixed film <br />treatment systems to achieve effective nitrification in a small footprint. Both processes are also <br />considered relatively easy to operate and the MABR passive aeration system consumes <br />significantly lower energy compared to other treatment technologies. <br />The final system sizing and design of the nitrification process facility will meet or exceed the <br />capacity requirements for the selected proportion of WPCP effluent flows that will be treated <br />by the proposed 4.3 -acre basin bioreactor treatment wetland system. The Terraphase Team will <br />begin the design development process by evaluating and comparing the various options under <br />sub -task 1 and sub -task 2 below. <br />Deliverables: <br />Assessment of Site Opportunities & Constraints, Technology Options and Development <br />of Preliminary Nitrification Facility Conceptual Design and Sizing Options <br />2. Incorporation of Opportunities & Constraints Assessment Findings, <br />Comparison/Screening of Facility Sizing and Configuration Options to Support Final <br />Selection and Conceptual Design Optimization of the Nitrification Facility <br />3. Preparation of Nitrification Facility Basis of Design Technical Memorandum <br />4. Preparation of 30% Design Plans/Construction Documents, Specifications and <br />Construction cost Estimates for the Nitrification Facility <br />5. Preparation of 60% Design Plans/Construction Documents, Specifications and <br />Construction Cost Estimates for the Nitrification Facility <br />6. Preparation of 100% Design Plans/Construction Documents, Specifications and <br />Construction Cost Estimates for the Nitrification Facility <br />Consulting Services Agreement between City of San Leandro and Last revised September 10, 2019 <br />Terraphase Engineering for Treatment Wetland Design Services Exhibit A — Page 30 of 38 <br />