Cal. Code Regs. tit. 23 § 3939.20

Current through Register 2024 Notice Reg. No. 50, December 13, 2024

Section 3939.20 - Total Maximum Daily Load for Metals for Ballona Creek

On September 6, 2007, the Los Angeles Regional Water Quality Control Board (Los Angeles Water Board) adopted Resolution No. R2007-015, amending the Water Quality Control Plan for the Los Angeles Region (Basin Plan). This Basin Plan amendment establishes a Total Maximum Daily Load (TMDL) to reduce metals (copper, lead, selenium, and zinc) in Ballona Creek for dry weather (maximum daily flow in the creek less than 40 cubic feet per second (cfs)) and wet weather (maximum daily flow in the creek equal to or greater than 40 cubic feet per second). The TMDL:

(1) sets dry- and wet-weather numeric targets to achieve the California Toxics Rule (CTR) numeric water quality criteria for metals;

(2) establishes a dry-weather loading capacity for a single critical flow to meet dry-weather numeric targets;

(3) establishes a wet-weather loading capacity that varies with flow in order to meet the wet-weather numeric targets; and

(4) allocates the dry- and wet-weather loading capacities among point and nonpoint sources of metals, with most of the capacity allocated to storm water sources.

The principal regulatory mechanisms to implement the TMDL are:

(1) the Los Angeles County municipal separate storm sewer system (MS4) National Pollutant Discharge Elimination System (NPDES) permit,

(2) the Caltrans MS4 NPDES permit,

(3) the general industrial and construction storm water NPDES permits,

(4) "other NPDES permits" for low-volume, intermittent, non-stormwater discharges, and

(5) the authority vested in the Executive Officer by Water Code section 13267.

On December 6, 2013, the Los Angeles Regional Water Quality Control Board adopted Resolution No. R13-010, amending the Basin Plan to revise the Total Maximum Daily Loads for Metals in Ballona Creek and the Total Maximum Daily Loads for Toxic Pollutants in the Ballona Creek Estuary

The Basin Plan amendment adopted by Resolution No. R13-010 revises the TMDL adopted by Resolution No. 2007-015 by revising allocations based on adjusting the maximum daily flow in the creek from 40 cfs to 64 cfs and adjusting the dry- and wet-weather translators; removing selenium numeric target and allocations from the TMDL; and providing additional flexibility to implement and demonstrate compliance with the TMDL.

Cal. Code Regs. Tit. 23, § 3939.20

1. New section summarizing amendments to basin plan filed 12-9-2005; amendment approved by State Water Resources Control Board Resolution No. 2005-0078 on 10-20-2005; amendments approved by OAL pursuant to Government Code section 11353 on 12-9-2005 (Register 2005, No. 49).
2. Editorial correction of HISTORY 1 (Register 2006, No. 3).
3. Summary of basin plan amendments filed 10-6-2008; amendments adopted by the Los Angeles Regional Water Quality Control Board 9-6-2007 per Resolution No. R2007-015. Approved by the State Water Resources Control Board 6-17-2008 per Resolution No. 2008-0045; approved by OAL 10-6-2008 pursuant to Government Code section 11353 (Register 2008, No. 41).
4. Summary of basin plan amendment filed 5-4-2015; amendment approved by State Water Resources Control Board Resolution No. 2014-0030 on 6-17-2014; amendment approved by OAL pursuant to Government Code section 11353 on 5-4-2015 (Register 2015, No. 19).

1. New section summarizing amendments to basin plan filed 12-9-2005; amendment approved by State Water Resources Control Board Resolution No. 2005-0078 on 10-20-2005; amendments approved by OAL pursuant to Government Code section 11353 on 12-9-2005 (Register 2005, No. 49).
2. Editorial correction of History 1 (Register 2006, No. 3).
3. Summary of basin plan amendments filed 10-6-2008; amendments adopted by the Los Angeles Regional Water Quality Control Board 9-6-2007 per Resolution No. R2007-015. Approved by the State Water Resources Control Board 6-17-2008 per Resolution No. 2008-0045; approved by OAL 10-6-2008 pursuant to Government Code section 11353(Register 2008, No. 41).
4. Summary of basin plan amendment filed 5/4/2015; amendment approved by State Water Resources Control Board Resolution No. 2014-0030 on 6-17-2014; amendment approved by OAL pursuant to Government Code section 11353 on 5-4-2015 (Register 2015, No. 19).