Improving Water Quality in the Tijuana River Valley Project #3: Treat Wastewater from the International Collector at the ITP Overview This project expands treatment capacity in the U.S. to treat all wastewater from central Tijuana currently pumped to the San Antonio de los Buenos Wastewater Treatment Plant (SABTP) for treatment and discharge out the South Bay Ocean Outfall (SBOO), This project will: • Expand the South Bay International Wastewater Treatment Plant (ITP) to 50 MGD1 to provide secondary treatment capacity for International Collector flows. • Reduce demands on SABTP and the amount of untreated wastewater that is discharged to the Pacific Ocean via SAB Creek. • Potentially reduce raw sewage spiils that currently reach the Tijuana River. Project at a Glance Location of Operations Entry Points Addressed Targeted Pollutant(s) United States SAB Creek, Tijuana River Untreated Wastewater COST ESTIMATES Capital $299M Annual O&M2 $10M 40-year lifecycle $70QM TRANSBOUNDARY TIJUANA RIVER IMPACT3 (Annual Benefit) Flow day reduction - Flow rate reduction - Sewage reduction - SAB CREEK IMPACT (Annual Benefit) Flow rate reduction 26% Sewage reduction4 50% Will this project increase public health and beach water quality? This project will reduce impacts to the U.S. coast by capturing and treating wastewater from Tijuana that would otherwise be discharged to the Pacific Ocean without adequate treatment at the SABTP. Does this project improve work conditions for government activities? Implementation of this project is expected to reduce health risks among Navy personnel who train along the beachfront near the U.S. Navy Base in San Diego, California. However, it will not resolve existing impacts to U.S. Border Patrol operations and personnel, who are sometimes exposed to untreated wastewater while performing their job duties near border infrastructures. BEACH CLOSURE IMPACTS (Annual Benefit) Closure reduction5 32% LEGEND 1 MGD: million gallons per day 2 O&M: Operations and maintenance 3 This project benefits the Tijuana River when Mexican facilities are not operational 4 Estimates of sewage reduction are based on the reduction of BOD (biochemical oxygen demand), a standard surrogate for sewage 5 Beach closure reduction estimates are based on Scripps Institution of Oceanography models ------- NW Waves (Winter) Project 3: Treat Wastewater from the International Collector at the UP Imperial San Diego South Bay Ocean Outfall South Bay Water Reclamation Plant International (SBWRP Treatment Plant (ITP) (Expanded) PACIFIC OCEAN Northern Currents (Summer) Pump Station 1A International Collector UNITED STATES -to '4* % PB CILA MEXICO San Antonio de los Buenos (SAB) Creek Tijuana ------- |