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 3939.52 - A Total Maximum Daily Load for Nutrients in the Santa Clara River Lakes (Elizabeth Lake, Munz Lake, and Lake Hughes)

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
On September 8, 2016, the Los Angeles Regional Water
					 Quality Control Board (Los Angeles Water Board) adopted Resolution No. R16-006,
					 amending the Water Quality Control Plan for the Los Angeles Region (Basin Plan)
					 to incorporate a total maximum daily load (TMDL) for nutrients in the Santa
					 Clara River Lakes (Elizabeth Lake, Munz Lake, and Lake Hughes). The State Water
					 Resources Control Board (State Water Board) approved the amendment under
					 Resolution No. 2017-0011 on March 7, 2017.
The TMDL sets numeric targets for dissolved oxygen and pH
					 based on numeric water quality objectives provided in the Basin Plan. The TMDL
					 also includes numeric targets for chlorophyll
a
and nutrients
					 (total nitrogen and total phosphorus) 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. Internal
					 loading from lake bed sediments comprises over 99% of the current nutrient
					 loading to Elizabeth Lake and Lake Hughes. Other sources of nutrients to these
					 lakes include sheet flow from the surrounding land, atmospheric deposition,
					 onsite wastewater treatment systems (OWTS), and the Lake Hughes Community
					 Wastewater Treatment Facility (WWTF).
Waste load allocations (WLAs) will be implemented through
					 the Los Angeles County MS4 Permit; or for additional responsible entities in
					 the future, MS4 permits under Phase II of the US EPA Stormwater Permitting
					 Program. Load allocations (LAs) for internal loading will be implemented
					 through a Memorandum of Agreement (MOA), a Clean Up and Abatement Order, or
					 other regulatory order. The LAs for nonpoint source runoff will be implemented
					 through WDRs, waivers of WDRs, or other regulatory mechanisms in accordance
					 with the Nonpoint Source Implementation and Enforcement Policy. The LAs for
					 OWTS will be implemented through WDRs or waivers of WDRs. The LAs for the Lake
					 Hughes Community WWTF will be implemented through the facility's WDRs. Waste
					 load allocations must be achieved within 15 years of the effective date of the
					 TMDL. The LAs for OWTS and the Lake Hughes Community WWTF must be achieved as
					 soon as possible, but no later than 12 years after the effective date of the
					 TMDL. The LAs for internal loading and nonpoint source runoff must be achieved
					 within 15 years of the effective date of the TMDL.
1. New
					 section summarizing amendments to Basin Plan filed 6-22-2017; amendments
					 approved by State Water Resources Control Board Resolution No. 2017-0011 on
					 3-7-2017; amendments approved by OAL pursuant to Government Code section
					 11353 on
					 6-23-2017 (Register 2017, No. 25).