California Code of Regulations › Title 23 - Waters › Division 4 - Regional Water Quality Control Boards › Chapter 1 - Water Quality Control Plans, Policies, and Guidelines › Article 4 - Los Angeles Region › Section 3939.45 - A Total Maximum Daily Load for Algae, Nutrients, and Eutrophic Conditions in the Ventura River Including the Estuary and Its Tributaries

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
On December 6, 2012, the Los Angeles Regional Water Quality
					 Control Board adopted Resolution No. R12-011, amending the Water Quality
					 Control Plan for the Los Angeles Region (Basin Plan) by establishing a Total
					 Maximum Daily Load (TMDL) for Algae, Nutrients, and Eutrophic Conditions in the
					 Ventura River including the Estuary and its Tributaries. The TMDL includes
					 numeric targets for dissolved oxygen and pH equal to their numeric water
					 quality objectives in the Basin Plan. The TMDL also includes numeric targets
					 for algal and phytoplankton biomass and percent cover as numeric
					 interpretations of the water quality condition that will demonstrate attainment
					 of the narrative water quality objective for biostimulatory substances in the
					 Basin Plan. The method to develop these numeric targets is based on the
					 California Nutrient Numeric Endpoints (NNE) approach, developed by U.S. EPA
					 Region 9 and the State and Regional Water Quality Control Boards. The TMDL
					 includes waste load allocations (WLAs) and load allocations (LAs) for
					 discharges from the Ojai Valley Waste Water Treatment Plant (WWTP), the Ventura
					 County Municipal Separate Storm Sewer (MS4), the Caltrans MS4, agriculture
					 sources, horse/intensive livestock activities, grazing activities, general
					 industrial and construction stormwater permittees, onsite wastewater treatment
					 systems, and other National Pollution Discharge Elimination System (NPDES)
					 permittees in the Ventura River watershed in order to attain numeric
					 targets.
The regulatory mechanisms used to implement the WLAs
					 include the Ojai Valley WWTP NPDES permit, the Ventura County MS4 permit, the
					 Caltrans MS4 permit, the general industrial storm water permits, the general
					 construction storm water permits, and other NPDES permits. The regulatory
					 mechanisms used to implement the LAs include Basin Plan discharge prohibitions,
					 waste discharge requirements (WDRs), and waivers of WDRs or other regulatory
					 mechanisms in accordance with the State Nonpoint Source Implementation and
					 Enforcement Policy (NPS Policy). The TMDL allows for an implementation schedule
					 of up to 6-12 years to meet the WLAs and LAs, depending on the source.
					 Discharge monitoring to demonstrate compliance with WLAs and LAs shall be
					 included in the regulatory mechanisms for each source, and ambient monitoring
					 to assess watershed-wide waterbody conditions shall be conducted either
					 individually or cooperatively among all dischargers.
1. New
					 section summarizing amendments to basin plan filed 6-4-2013; amendments
					 approved by State Water Resources Control Board on 2-19-2013 pursuant to
					 Resolution No. 2013-0005; amendment approved by OAL pursuant to Government Code
					 section
					 11353 on
					 6-4-2013 (Register 2013, No. 23).