Solutions for Progress 

Basin Plan Amendments / Use Attainability Analyses

RBI is an industry leader in the arena of water quality standards refinement. RBI works with the State and Regional Water Boards and U.S. EPA to develop and adopt amendments to the Sacramento River and San Joaquin River Basin Water Quality Control Plan (Basin Plan) water quality objectives. 

  •  Deer Creek pH, Turbidity, and Temperature. RBI developed site-specific objectives for Deer Creek pH, turbidity, and temperature as the appropriate means of resolving key NPDES permit compliance issues for the El Dorado Irrigation District’s (EID) Deer Creek Wastewater Treatment Plant. The adoption and approval of these site-specific objectives not only refined these water quality objectives for Deer Creek, but also saved EID approximately $20 million in unnecessary upgrades at its Deer Creek Wastewater Treatment Plant. 
  • Basin-wide Amendments. Based on the sound scientific basis of the pH and turbidity amendments RBI developed for Deer Creek, these amendments were subsequently adopted Basin-wide by the Central Valley Regional Water Board and subsequently approved by the State Water Board and U.S. EPA.
  • New Alamo and Ulatis Creek Site-Specific Objectives. RBI developed and Regional Water Board has approved site-specific objectives for chloroform, dibromochloromethane, and dichlorobromomethane for reaches of New Alamo and Ulatis creeks in Solano County. These site-specific objectives were developed based on findings from a use attainability analysis prepared by RBI showing that municipal and domestic supply (MUN) was not an existing or attainable use of the creeks. The resulting objectives resolved an ongoing compliance issue for the City of Vacaville’s Easterly Wastewater Treatment Plant, which would have had to implement treatment modifications to reduce concentrations of these trihalomethane compounds had the new objectives not been adopted.
  • Agriculturally Dominated Water Bodies MUN Beneficial Use Project.  RBI is working for Central Valley Regional Water Quality Control Board Basin Planning staff on their on-going project to evaluate and appropriately de-designate the municipal and domestic supply (MUN) beneficial use from agriculturally dominated water bodies in the Sacramento River and San Joaquin River basins.  The project encompasses developing two Basin Plan amendments.  One for specific water bodies that are receiving waters for the cities of Biggs, Colusa, Live Oak, and Willows wastewater effluent has been approved by the Central Valley Water Board, State Water Resources Control Board, and Office of Administrative Law, and is pending approval by the U.S. EPA.  The second is a broader “process” amendment that will allow future MUN evaluations and de-designations to occur for certain classes of agriculturally dominated water bodies.  RBI is the lead preparer of the environmental review and CEQA documentation for the project.  In addition, RBI is providing staff support in the development of the proposed amendment, its program of implementation, and monitoring and surveillance program.