California Code of Regulations
Title 23 - Waters
Division 3 - State Water Resources Control Board and Regional Water Quality Control Boards
Chapter 16 - Underground Tank Regulations
Appendix III - Examples of Quantitative Release Detection Methods for Existing Tanks
| Detection Method | Performance Standards |
| Automatic Tank Gauging (At least once every 30 days) | Section 2643(b)(1) |
| Statistical Inventory Reconciliation (At least once every 30 days) and Tank Integrity Testing (At least once every 24 months) | Section 2643(b)(2) |
| Continuous In-tank Leak Detection (At least once every 30 days) | Section 2643(b)(3) |
Examples of Quantitative Release Detection Methods for Single-Walled Pressurized Piping
| Detection Method | Performance Standards |
| Automatic Mechanical Line Leak Detector (Hourly) and 0.2 Gallons Per Hour Monitoring (At least once every 30 days) | Section 2643(c)(1) & Section 2643(c)(2) |
| Automatic Mechanical Line Leak Detector (Hourly) and Line Tightness Test (At least once every 12 months) | Section 2643(c)(1) & Section 2643(c)(3) |
| Automatic Electronic Line Leak Detector (Hourly) and (At least once every 30 days or 12 months) (meets both section 2643(c)(1) and (2) or (3)) | Section 2643(c)(1) & Section 2643(c)(2) or Section 2643(c)(3) |
Examples of Qualitative Release Detection Methods for Single-Walled Suction Piping
| Detection Method | Performance Standards |
| Line Tightness Test (At least once every 36 months) and Daily Monitoring | Section 2643(d) & Appendix II |
Example of Qualitative Release Detection Methods for Single-Walled Gravity Flow Piping
| Detection Method | Performance Standards |
| Line Tightness Test (At least once every 24 months) | Section 2643(e) |
Examples of Qualitative Release Detection Methods for Existing Tanks and Piping
| Detection Method | Performance Standards |
| Vapor Monitoring (Continuous) | Sections 2644(a), (b), & 2647 |
| Ground Water Monitoring (At least once every 30 days) | Sections 2644(a), (c), & 2648 |
1. New
Appendix IV filed 8-9-91 as an emergency; operative 8-9-91. Text remains in
effect uninterrupted pursuant to Health and Safety Code section
25299.7
(Register 92, No. 14).
2. Editorial correction of printing errors in
HISTORY 1 (Register 92, No. 43).
3. Repealer and renumbering and
amendment of former Appendix IV to Appendix III filed 4-5-94; operative 5-5-94
(Register 94, No. 14). For prior history, see Register 92, No.
43.
4. Repealer and new Appendix III filed 8-27-2018; operative
10-1-2018 (Register 2018, No. 35).
