CSA HDR Inc Nutrient Analysis 11-20-2024

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Consulting Services Agreement between City of San Leandro and Last revised 10/28/2024 HDR, Inc. for Nutrient Alternatives Evaluation Exhibit A – Page 5 of 7 A process model of existing conditions and various final and interim treatment process alternatives based on the tasks below. Task 4 – Conceptual Alternatives Evaluation Task 4.1 – Review Interim Operational Optimization Options This subtask intends to suggest operational optimization options for WPCP compliance with the interim nutrient limits for the next 10 years (before final limits take effect). HDR will request and review H2OWork's historic treatment plant operating parameters and suggest solutions for H2OWorks to meet the interim permit limits with a reasonable safety factor based on available plant- specific data. Furthermore, HDR will also leverage the Water Research Foundation #4973 web- based plant optimization tool that Mike Falk (Project Manager) developed as Co-Principal Investigator under #4973. HDR will review existing H2OWorks process operations strategies and discuss key criteria for potential operational improvements based on discussions with the plant operation leadership team. ASSUMPTIONS T 4.1: The workshop will last up to two hours and be attended by up to three HDR team members. The draft and final TM will be up to five pages (excluding appendices). Task 4.2 Develop Conceptual Nutrient Removal Options HDR will present and discuss a range of potentially viable conceptual nutrient removal options applicable to the WPCP and quickly screen them down to a shorter list for a more detailed evaluation in collaboration with H2OWorks. HDR will categorize options into logical categories and rank them according to the criteria developed in the above tasks. For nutrient limits, the conceptual alternatives will consider the proposed interim and final limits in the draft third watershed permit and provide removal alternatives that will, at a minimum, be able to meet currently known nutrient limits. The City will provide the proposed interim and final limits agreed upon with EBDA and its member agencies. Proposed conceptual alternatives will also consider the potential for the RWQCB to issue future nutrient removal limits that may be more stringent than what is currently known. Another effort under this task will be to evaluate the level of removal that would be achieved if WPCP fully utilized the available existing infrastructure as much as possible to keep costs down. HDR will evaluate what level of treatment would be achieved by presenting concepts for two scenarios: Scenario 1: Limiting project cost to approximately $5 million. Scenario 2: Limiting project cost to approximately $10 million. Task 4.3 Meetings: HDR will prepare, attend, and present information to WPCP staff at two meetings: Docusign Envelope ID: F4C31A54-5BDC-41AE-BF85-10613D6DCA60