Reso 2019-160 - Laserfiche WebLink

Home

We will develop a customized treatment wetland design approach to significantly reduce existing nitrogen loading rates. An adaptive management plan will be developed to support system operations and to determine optimized influent flow rates and an associated flow schedule for the system throughout the year (during dry and wet -weather periods). Since steeper side slopes (3:1) can reduce the amount of water infiltration, storage and filtering through surrounding soils and minimize the potential extent of vegetated habitat area, it is preferable to construct terraced bioreactors with specific areas of flatter slope designed to provide more fringe habitat. The identification of an optimal underlying side slope angle for the proposed terraced basin perimeter levees/berms will be presented with respect to site constraints and Project objectives. The design will be developed to enhance both treatment functionality and desired ecotone/wildlife habitat. DELIVERABLES: Technical memo and supporting conceptual design drawings presenting recommended design alternatives and treatment optimization options TASK 2.5 — DESIGN REVIEW MEETINGS AND INCORPORATION OF CONSTRAINTS AND OPPORTUNITIES ASSESSMENT FINDINGS AND INPUT FROM KEY STAKEHOLDERS TO SUPPORT DESIGN OPTIMIZATION The Terraphase Team technical leads will work closely with the City to solicit input and feedback from the local community, regulatory agencies, and interested stakeholders. We will participate in a series of design review meetings with a diverse group of technical experts and stakeholders to inform the design of the full-scale multi-purpose facility to polish nitrified secondary treated wastewater effluent and create novel ecotone habitat in an existing storage basin. We recommend including key resource agency representatives in one or more of these meetings to support evaluation of potential Project alternatives and to gain consensus on the design approach. The Terraphase Team key technical leads will participate in up to three full- day design review workshops with the City, agency representatives and expert advisers as needed to discuss site conditions, constraints, and to refine the Project conceptual design. DELIVERABLES: Design review meeting presentations and compilation of supporting materials for each meeting TASK 2.6 — PREPARE PRELIMINARY DESIGN REPORT FOR PREFERRED ALTERNATIVE RECOMMENDATION The Terraphase Team will prepare the Preliminary Design Report, including recommendations for the final preferred conceptual design for the Project based on the input gained from the design review meetings, agency communications and wetland system engineering evaluations. The Preliminary Design Report will summarize the findings in Task 2, incorporating input from the Project team, stakeholders, and expert advisors. The Preliminary Design Report will be drafted by Lucas Paz, Hans Kramer, Scott Wallace and Jeff Raines with support from Kelly Lam and.Morgan O'Hare. After completion of the Preliminary Design Report, the Terraphase Team will meet with the City to confirm the preferred alternative layout, construction sequencing, and proposed construction materials/methods. Consulting Services Agreement between City of San Leandro and Last revised September 10, 2019 Terraphase Engineering for Treatment Wetland Design Services Exhibit A — Page 23 of 38