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 3939.41 - A Total Maximum Daily Load for Bacteria in the los Angeles River Watershed

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
Los Angeles Regional Water Quality Control Board (Regional
					 Board) Resolution No. R10-007, adopted on July 9, 2010 by the Regional Board,
					 modified the regulatory provisions of the Water Quality Control Plan for the
					 Los Angeles Region (Basin Plan) by (1) revising the Table of Contents and (2)
					 establishing a Total Maximum Daily Load (TMDL) for Bacteria in the Los Angeles
					 River Watershed.
Los Angeles River Reaches 1, 2, 4, and 6, Aliso Canyon
					 Wash, Arroyo Seco Reaches 1 and 2, Bull Creek, Compton Creek, Dry Canyon Creek,
					 McCoy Canyon Creek, Rio Hondo Reaches 1 and 2, Tujunga Wash, and Verdugo Wash
					 Reaches 1 and 2 have been listed pursuant to federal Clean Water Act Section
					 303(d) as not
					 attaining water quality standards due to elevated levels of indicator bacteria.
					 The Regional Board and the State Water Resources Control Board have adopted the
					 proposed 2008 federal Clean Water Act Section
					 303(d) list,
					 which includes both Bell Creek and Burbank Western Channel as impaired
					 waterbodies for elevated levels of indicator bacteria. The beneficial uses most
					 affected by elevated levels of indicator bacteria in the Los Angeles River
					 Watershed include water contact recreation (REC-1) and non-contact water
					 recreation (REC-2). These listings are subject to the Consent Decree deadline
					 between USEPA and Heal the Bay, Case No. 98-4825 SBA. According to the consent
					 decree, TMDLs must be approved or established by USEPA by March 24, 2012 to
					 address coliform in analytical unit 15.
The amendment establishes final waste load allocations
					 (WLAs) for point source discharges, final load allocations (LAs) for nonpoint
					 source discharges, and interim WLAs for Municipal Separate Storm Sewer System
					 (MS4) permittees. Final allocations to achieve the single sample maximum
					 numeric targets are expressed as "allowable exceedance days". No exceedance
					 days of the geometric mean targets are allowed. Allowable exceedance days are
					 further separated into dry weather and wet weather allowances. The amendment
					 establishes a phased and stepped implementation schedule for complying with
					 allocations with separate final compliance dates of up to 18.5 years for dry
					 weather, depending on the segment, and 25 years for wet weather, given the
					 different conditions and implementation approaches necessary to achieve
					 compliance.
Responsible parties shall submit a Coordinated Monitoring
					 Plan one year after the effective date of the TMDL. To achieve the dry weather
					 interim WLAs, MS4 permittees shall submit a Load Reduction Strategy (LRS) for
					 reducing dry weather loading into the MS4. MS4 permittees that choose to comply
					 with the TMDL in dry weather through alternative methods shall submit an
					 alternative compliance plan for Regional Board Executive Office approval. MS4
					 permittees implementing an LRS may be permitted a second phase for implementing
					 a revised LRS. Responsible parties shall submit a wet weather implementation
					 plan 10 years after the effective date of the TMDL and shall achieve the final
					 wet weather WLAs no later than 25 years after the effective date of the
					 TMDL.
In addition to a brief description of the Los Angeles River
					 Watershed and the existing conditions contributing to water quality problems,
					 the Basin Plan amendment also includes numeric targets, a source analysis, a
					 linkage analysis, WLAs, LAs, a margin of safety and critical conditions.
1. New
					 section summarizing amendment to basin plan filed 3-21-2012; amendments adopted
					 by the Los Angeles Regional Water Quality Control Board 7-9-2010 pursuant to
					 Resolution No. R10-007. Approved by the State Water Resources Control Board
					 11-1-2011 pursuant to Resolution No. 2011-0056; approved by OAL pursuant to
					 Government Code section
					 11353 on
					 3-21-2012 (Register 2012, No. 12).