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§ 3989.7. Total Maximum Daily Load for Dissolved Copper, Lead and Zinc in Chollas Creek, Tribut...

23 CA ADC § 3989.7BARCLAYS OFFICIAL CALIFORNIA CODE OF REGULATIONS

Barclays Official California Code of Regulations Currentness
Title 23. Waters
Division 4. Regional Water Quality Control Boards
Chapter 1. Water Quality Control Plans, Policies, and Guidelines
Article 9. San Diego Region
23 CCR § 3989.7
§ 3989.7. Total Maximum Daily Load for Dissolved Copper, Lead and Zinc in Chollas Creek, Tributary to San Diego Bay.
(a) Through Regional Water Board Resolution R9-2007-0043, adopted June 13, 2007, the San Diego Regional Water Quality Control Board amended the Water Quality Control Plan for the San Diego Region (Basin Plan). On July 15, 2008, the State Water Resources Control Board (State Water Board approved this amendment under State Water Board Resolution No. 2008-0054. This Basin Plan amendment establishes a Total Maximum Daily Load (TMDL) and associated load and wasteload allocations for copper, lead and zinc in Chollas Creek, and revises the Toxic Pollutants section of Chapter 3 to reference in the California Toxics Rule [40 CFR 131.38]. This amendment includes a program to implement the TMDL and monitor its effectiveness. Full implementation of the TMDLs for dissolved copper, lead and zinc shall be completed within 20 years from the effective date of the Basin Plan amendment. The compliance schedule for implementing the wasteload reductions required under these TMDLs is structured in a phased manner, with 80 percent of reductions required in 10 years, and 100 percent of reductions required within 20 years. The 20-year compliance schedule is contingent upon the discharges implementing integrated controls to achieve required copper, lead, zinc, indicator bacteria, diazinon, and trash reductions. Water quality monitoring will be necessary to assess progress in achieving wasteload allocations and compliance in Chollas Creek with the water quality criteria for dissolved copper, lead, and zinc.
(b) On February 8, 2017, the San Diego Regional Water Quality Control Board adopted Resolution No. R9-2017-0015, amending the Basin Plan to adopt site-specific water effect ratios (WERs) for dissolved copper and dissolved zinc in Chollas Creek during wet weather and to update the numeric targets for the Chollas Creek dissolved copper and zinc TMDLs to incorporate site-specific WERs. The California Toxics Rule [40 C.F.R. 131.38] set forth the method for calculating acute and chronic water quality criteria for metals as a function of hardness and a WER. Pursuant to 40 C.F.R. section 131.38(b)(2) and (c)(4)(iii), the default value of the WER is 1, unless there is a site-specific WER for a given pollutant. The site-specific WERs for Chollas Creek replace the default WER and will be used to calculate the criteria maximum concentration and criteria continuous concentration for dissolved copper and dissolved zinc and to evaluate if the numeric targets for the Chollas Creek dissolved copper and dissolved zinc TMDLs have been attained during wet weather.
HISTORY
1. New section summarizing amendments to Basin Plan filed 10-22-2008; amendments adopted by the San Diego Regional Water Quality Control Board 6-13-2007 per Resolution No. R9-2007-0043. Approved by the State Water Resources Control Board 7-15-2008 per Resolution No. 2008-0054; approved by OAL 10-22-2008 pursuant to Government Code section 11353 (Register 2008, No. 43).
2. New subdivision (b) summarizing amendment to basin plan filed 3-5-2020; amendment approved by State Water Resources Control Board Resolution No. 2019-0046 on 9-17-2019; amendment approved by OAL pursuant to Government Code section 11353 on 3-5-2020 (Register 2020, No. 10).
This database is current through 6/17/22 Register 2022, No. 24
23 CCR § 3989.7, 23 CA ADC § 3989.7
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