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 3939.32 - A Total Maximum Daily Load for Boron, Chloride, Sulfate, and TDS (Salts) in the Calleguas Creek Watershed

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
On October 4, 2007, the Los Angeles Regional Water Quality
					 Control Board (Los Angeles Water Board) adopted Resolution No. R4-2007-016,
					 amending the Water Quality Control Plan for the Los Angeles Region (Basin
					 Plan). This Basin Plan amendment establishes a Total Maximum Daily Load (TMDL)
					 in the Calleguas Creek Watershed for boron, chloride, sulfate, and TDS (Total
					 Dissolved Solids), constituents commonly referred to as salts. The TMDL:
(1) sets numeric targets in the Basin Plan to
				  achieve the surface and groundwater quality objectives for boron, chloride,
				  sulfate, and TDS;
(2) establishes
				  waste load allocations for point sources including Publicly Owned Treatment
				  Works (POTWs), permitted storm water dischargers, and other National Pollutant
				  Discharge Elimination System (NPDES) dischargers; and
(3) establishes load allocations for
				  irrigated agricultural dischargers to meet the numeric targets.
This TMDL addresses water quality impairments due to
					 elevated levels of salts including boron, chloride, sulfate, and TDS in the
					 Calleguas Creek Watershed as documented in the State of California 303(d) list
					 of impaired water bodies. This TMDL supersedes the chloride TMDL established by
					 the U.S. Environmental Protection Agency in 2002.
This TMDL sets forth waste load allocations for POTWs,
					 permitted storm water dischargers, and other NPDES dischargers, and load
					 allocations for irrigated agricultural dischargers which limit the mass of
					 salts that can be discharged to the Calleguas Creek Watershed. The TMDL
					 includes provisions for optional Special Studies to improve understanding of
					 key aspects related to the achievement of waste load allocations and load
					 allocations for salts. The TMDL establishes a Monitoring Plan for tracking
					 inputs and outputs to the Calleguas Creek Watershed to ensure that the goal of
					 a salts balance in the watershed is being achieved and water quality objectives
					 are being met. The TMDL establishes an Implementation Plan that has four key
					 structural elements to the regional implementation: Regional Salinity
					 Management Conveyance (RSMC), Water Conservation, Water Softeners, and Best
					 Management Practices for Irrigated Agriculture. Subwatershed implementation
					 includes the Renewable Water Resource Management Program (RWRMP) for the
					 Southern Reaches and the Northern Reach Renewable Water Management Plan
					 (NRRWMP).
The TMDL implementation plan is based on construction of a
					 regional brine line and ocean outfall whereby brines from the advanced
					 treatment of degraded groundwater in the Calleguas Creek Watershed are
					 discharged directly to the ocean in compliance with the California Ocean Plan.
					 The TMDL implementation plan also includes increased use of POTW effluent and
					 advanced treated (reverse osmosis) groundwater for recycled water. The proposed
					 TMDL requires the POTWs, permitted storm water dischargers, other NPDES
					 dischargers, and irrigated agricultural dischargers to achieve their
					 allocations in the entire watershed within 15 years. The implementation plan
					 has been developed as a phased plan with interim salt load reduction, to allow
					 for a review of implemented actions to attain water quality.
1. New
					 section summarizing amendments to the basin plan filed 11-6-2008; amendments
					 approved by State Water Resources Control Board Resolution No. 2008-0033 on
					 5-20-2008; amendments approved by OAL pursuant to Government Code section
					 11353 on
					 11-6-2008 (Register 2008, No. 45).