Improving Water Quality n the Tijuana River Valley Project #2: Expand and Upgrade Tijuana River Diversion System in Mexico and Provide Treatment in the U.S. Overview This project includes improvements and expansion of the Tijuana River conveyance system in Mexico and diverts river water to a newly constructed primary wastewater treatment plant in the U.S. This project will: Expand diversion system capacity to 35 MGD1. Divert and treat dry-weather flow to reduce transboundary flows from entering the U.S. Provide advanced primary treatment with discharge to the Pacific Ocean through the existing South Bay Ocean Outfall (SBOO). Eliminate the need for Pump Station 1A in Mexico. Project at a Glance United States and Mexico Location of Operations Entry Points Addressed Targeted Pollutant(s) Tijuana River, SAB Creek Untreated Wastewater SAB CREEK IMPACT (Annual Benefit) Flow rate reduction 47% Sewage reduction 27% TRANSBOUNDARY TIJUANA RIVER IMPACT (Annual Benefit) Flow day reduction 52% Flow rate reduction 10% Sewage reduction3 55% COST ESTIMATES Capital $88M Annual O&M2 $9M 40-year lifecycle $382.M Will this project increase public health and beach water quality? This project will improve water quality in the Tijuana River. It will also reduce impacts to the U.S. coast by capturing and treating wastewater from Tijuana that otherwise would be discharged to the Pacific Ocean without adequate treatment from the San Antonio de Los Buenos Wastewater Treatment Plant (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. This project should reduce contaminated transboundary flows near border infrastructure where the Tijuana River crosses into the U.S. 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. BEACH CLOSURE IMPACTS (Annual Benefit) Closure reduction4 5% LEGEND 1 MGD: million gallons per day 2 O&M: Operations and maintenance 3 Estimates of sewage reduction are based on the reduction of BOD (biochemical oxygen demand), a standard surrogate for sewage 4 Beach closure reduction estimates are based on Scripps Institution of Oceanography models ------- NW Waves (Winter) Imperial Project 2: Expand and Upgrade Tijuana River Diversion System in Mexico and Provide Treatment in the U.S. San Diego South Bay Ocean Outfall PACIFIC OCEAN South Bay Water Reclamation Plant .. NŽ . /An...nr>v , . . Advanced Primary (SBWRP) International Treatment Plant Treatment Plant (ITP) UNITED STATES -to International Collector '4* % --X-- Northern Current (Summer) --'Pump Station 1A MEXICO PB CILA (upgraded) San Antonio de los Buenos (SAB) Creek Tijuana ------- |