The term “IWTP” means the South Bay International Wastewater Treatment Plant constructed under the provisions of the Federal Water Pollution Control Act (
33 U.S.C.
1251 et seq.), section 510 of the Water Quality Act of 1987 (
101 Stat. 80–82), and Treaty Minutes to the Treaty for the Utilization of Waters of the Colorado and Tijuana Rivers and of the Rio Grande, dated February 3, 1944.