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Ms. Rita di Candia Pleasanton FOG Page 3 June 3, 2025 Project 3. Rio Vista Pretreatment Program Development Organization City of Rio Vista Years of Service 2019-Present In 2019, the City of Rio Vista, which was not required to implement an approved Pretreatment Program, experienced several upset incidents at one of its wastewater treatment facilities. The City contracted with LWA to review and update the City's Sewer Use Ordinance to provide legal authority for issuing and enforcing wastewater discharge permits and regulating discharges into the City's collection system. The updated Sewer Use Ordinance was developed based on the USEPA Model Sewer Use Ordinance, which incorporated the requirements of 40 CFR Part 403. LWA also worked with the City to investigate and inspect the potential source(s) of the wastewater that resulted in the wastewater treatment facility upset. LWA identified the source of the wastewater treatment facility upset and worked with the City to develop and implement a wastewater discharge permit. Additionally, LWA assisted the City in identifying other industrial users that needed to be permitted to protect the wastewater treatment facility. In December 2023, the State Water Board and Central Valley Water Board conducted a Pretreatment Program Needs Assessment of the City and determined that the City needed to develop and implement an approved Pretreatment Program. LWA developed an Administrative Procedures Manual, which included an industrial user list, Enforcement Response Plan, wastewater discharge permit templates, inspection forms, and typical enforcement documents (e.g., Notices of Violations) for the City to submit to the Central Valley Water Board for review and approval. The Rio Vista wastewater treatment facility is currently undergoing modifications, after which LWA will conduct a local limits study. LWA TEAM The proposed Project Manager, Ms. Alina Constantinescu, PE, is a Project Engineer with over 20 years of experience in the environmental engineering field. Through her projects, she has provided assistance to various agencies with the National Pollutant Discharge Elimination System (NPDES) permit renewals, regulatory compliance, pollution prevention and pretreatment programs, as well as stormwater management. She has conducted pretreatment inspections for the cities of Richmond, South San Francisco, Grass Valley, Ridgecrest, and San Jose. In 2020, Alina served as the Interim Regulatory Program Manager for the Bay Area Clean Water Agencies (BACWA) and supported the association’s mission of regulatory advocacy on behalf of San Francisco Bay Area agencies. Alina is also actively involved in the California Water Environment Association (CWEA) Pretreatment, Pollution Prevention, and Stormwater (P3S) Committee and has presented and organized several regional and state-wide conferences and local training events while interacting with water quality professionals from across the state. Prior to joining LWA in 2007, Alina was an Associate Engineer for the City of Los Angeles Industrial Waste Pretreatment Program, where she worked on inspecting and permitting FSEs. She also served as an instructor in the Sewer Science Program, an outreach educational program on water resources and pollution prevention. Alina will be supported by Ms. Denise Conners as Senior Advisor and Mr. Alex Pinedo as Support Staff. Denise serves as Project Manager for LWA’s work in the fields of wastewater, recycled water, and potable water regulatory assistance. She has 30 years of experience in water quality regulatory development and tracking, municipal agency compliance assistance, and program permitting. Ms. Conners has been responsible for obtaining wastewater and recycled water permits, advising clients on regulatory compliance issues, negotiating enforcement actions, and designing and implementing technical studies to evaluate water quality impacts. Docusign Envelope ID: 183BA217-2E64-4627-AB5B-FA1828041D5A