Improving Water Quality in the Tijuana River Valley Project #6: Construct New Infrastructure to Address Trash and Sediment Overview This project involves the construction of infrastructure along the Tijuana River, Smuggler's Gulch, and Yogurt Canyon to reduce sediment and trash deposition into the Tijuana River Estuary. Trash booms and sediment basins adjacent to or within the main channel of the Tijuana River and Smuggler's Gulch (U.S.- or Mexico-side) are being considered along with flood mitigation infrastructure in Yogurt Canyon. Project at a Glance Trash1 Sediment2 Yogurt Canyon3 Location of Operations Entry Points Addressed Targeted Pollutant(s) United States and possibly Mexico Tijuana River, Cross-Border Canyons Trash, Sediment COST ESTIMATES Capital CD ¦cry $ 1M - 50M oo Annual O&M4 $ 0.03M - 6M $ 0.2M - 49 M LO ¦cry 40-year lifecycle $ 1M — 156M $ 9M - 1.7B $ 3.5M TRANSBOUNDARY TIJUANA RIVER IMPACT5 (Annual Benefit) Flow day reduction - - - Flow rate reduction - - - Sewage reduction6 - — - SAB CREEK IMPACT5 (Annual Benefit) Reduction in flow rate - - - Sewage reduction - - - Will this project increase public health and beach water quality? This project will reduce trash and sediment but is not expected to reduce sewage. Does this project improve work conditions for government activities? Expected improvements to U.S. Navy personnel training conditions and U.S. Border Patrol activities are unquantifiable. BEACH CLOSURE IMPACTS5 (Annual Benefit) Closure reduction7 LEGEND 1 Trash: Installation of trash booms in the Tijuana River Main Channel and Smuggler's Gulch 2 Sediment: Strategically placed sediment basins in the US and Mexico 3 Yogurt Canyon: Pilot channel in Yogurt canyon or modification to Monument Road 4 O&M: Operations and maintenance 5 Impacts are unquantifiable 6 Estimates of sewage reduction are based on the reduction of BOD (biochemical oxygen demand), a standard surrogate for sewage 7 Beach closure reduction estimates are based on Scripps Institution of Oceanography models ------- NW Waves (Winter) Project 6: Construct New Infrastructure to Address Trash and Sediment Imperial San Diego PACIFIC OCEAN South Bay Water Reclamation International Plant (SBWRP) Treatment Plant (ITP) Trash and sediment basin International Collector Northern Current (Summer) Pump Station 1A UNITED STATES MEXICO PB CILA San Antonio de Ios Buenos (SAB) Creek Tijuana ------- |