Section 2636 - Design, Construction, Installation, Testing, and Monitoring Requirements for Piping(a) Except as provided below, piping connected to tanks which were installed after July 1, 1987, shall have secondary containment that complies with the requirements of section 2631 for new underground storage tanks. This requirement does not apply to any of the following: (1) Vent or tank riser piping, provided the primary containment system is equipped with overfill prevention equipment meeting the requirements specified in sections 2635(c)(1)(B) or (C);(2) Vapor recovery piping if designed so that it cannot contain liquid-phase product; or(3) Suction piping if the piping is designed, constructed, and installed as follows: (A) The below-grade piping operates at less than atmospheric pressure (suction piping);(B) The below-grade piping is sloped so that the contents of the pipe will drain back into the storage tank if the suction is released (gravity-flow piping);(C) No valves or pumps are installed below grade in the suction line. Only one check valve is located directly below and as close as practical to the suction pump; and(D) An inspection method is provided which readily demonstrates compliance with subparagraphs (A) through (C) above.(b) All corrodible underground piping, if in direct contact with backfill material, shall be protected against corrosion. Piping constructed of fiberglass-reinforced plastic, steel with cathodic protection, or steel isolated from direct contact with backfill, fulfills this corrosion protection requirement. Cathodic protection shall meet the requirements of section 2635(a)(2).(c) Underground primary piping shall meet all of the following requirements: (1) Primary piping in contact with hazardous substances under normal operating conditions shall be installed inside a secondary containment system which may be a secondary pipe, vault, or a lined trench. All secondary containment systems shall be sloped so that all releases will flow to a collection sump located at the low point of the underground piping.(2) Primary piping and secondary containment systems shall be installed in accordance with an industry code of practice developed in accordance with voluntary consensus standards. The owner or operator shall certify that the piping was installed in accordance with the above requirements of section 2635(f). The certification shall be made on the "UST Certification of Installation/ Modification" submittal element in the California Environmental Reporting System or a local reporting portal.(d) Lined trench systems used as part of a secondary containment system shall be designed and constructed according to a code of practice or engineering standard approved by a state registered professional engineer. The following requirements shall also apply: (1) All trench materials shall be compatible with the substance stored and evaluated by an independent testing organization for their compatibility or adequacy of the trench design, construction, and application.(2) The trench shall be covered and capable of supporting any expected vehicular traffic.(e) All new primary piping and secondary containments systems shall be tested for tightness after installation in accordance with manufacturer's guidelines. Primary pressurized piping shall be tested for tightness hydrostatically at 150 percent of design operating pressure or pneumatically at 110 percent of design operating pressure. If the calculated test pressure for pressurized piping is less than 40 pounds per square inch, 40 pounds per square inch shall be used as the test pressure. The pressure shall be maintained for a minimum of 30 minutes and all joints shall be soap tested. A failed test, as evidenced by the presence of bubbles, shall require appropriate repairs and retesting. If there are no manufacturer's guidelines, secondary containment systems shall be tested using an applicable method specified in an industry code or engineering standard. Suction piping and gravity flow piping which cannot be isolated from the tank shall be tested after installation in conjunction with an overfilled volumetric tank integrity test or other test method meeting the requirements of section 2643(f), if approved by the local agency.(f) Underground piping with secondary containment, including under-dispenser piping with secondary containment, shall be equipped and monitored with monitoring systems as follows: (1) All secondary containment, including under-dispenser containment, and under-dispenser spill control or containment systems shall be equipped with a continuous monitoring system that either activates an audible and visual alarm or stops the flow of product at the dispenser when it detects a leak.(2) Automatic line leak detectors shall be installed on underground pressurized piping and shall be capable of detecting a three gallons per hour leak rate at 10 pounds per square inch within one hour with a probability of detection of at least 95 percent and a probability of false alarm no greater than five percent, and shall restrict or shut off the flow of product through the piping when a leak is detected.(3) Monitoring shall be conducted on all underground pressurized piping with secondary containment at least once every 12 months at a pressure designated by the equipment manufacturer, provided that the method is capable of detecting a minimum release equivalent to 0.1 gallons per hour defined at 150 percent of the normal operating pressure of the product piping system at the test pressure with at least a 95 percent probability of detection and not more than a five percent probability of false alarm.(4) Continuous monitoring systems as described in paragraph (1) above, satisfy the tightness testing requirement of paragraph (3) above, if both of the following conditions are met: (A) The monitoring system shuts down the pump or stops the flow of product at the dispenser when a leak is detected in the under- dispenser containment.(B) The monitoring system for all product piping other than that contained in the under-dispenser containment is fail safe, and shuts down the pump when a leak is detected.(5) Emergency generator tanks systems with underground pressurized piping shall meet one of the following: (A) Underground pressurized piping connected to an emergency generator tank system installed before October 1, 2018, may use a continuous monitoring system as described in paragraph (1) above, which activate an audible and visual alarm in the event of a leak or a malfunction of the monitoring system satisfy the automatic line leak detector requirement of paragraph (2) above. The monitoring system shall be checked at least daily by either remote electronic access or on-site visual inspections. A log of daily checks shall be available for local agency review upon request. By October 13, 2018, all underground pressurized piping connected to an emergency generator tank system shall meet section 2666(f).(B) Underground pressurized piping connected to an emergency generator tank system installed on or after October 1, 2018, shall be equipped with an automatic line leak detector in accordance with paragraph (2) above. In lieu of restricting or shutting off the flow of product through the piping, the automatic line leak detector may activate an audible and visual alarm when a leak is detected.(g) Under-dispenser containment shall be designed, constructed, and installed in accordance with the following: (1) Owners or operators of an underground storage tank system shall have the system fitted with under-dispenser containment, or an approved under-dispenser spill containment or control system.(2) Under-dispenser containment shall be designed, constructed, installed, and monitored in accordance with section 2631 and subdivisions (c)(2), (e), and (f) above.(3) A manufacturer of an under-dispenser spill containment or control system may apply to the Division of Water Quality Underground Storage Tank Program Manager for approval of the system. Owners or operators shall not install an under-dispenser spill containment or control system that has not been approved. (A) Applications for approval shall be submitted in writing and include the following: (i) A description of the proposed system; and(ii) Clear and convincing evidence that the system will protect the soil and beneficial uses of the waters of the state from unauthorized releases.(B) The Program Manager shall review the application to determine if the proposed system adequately protects the soil and beneficial uses of groundwater before determining whether to approve the proposed system.(C) The Program Manager may modify or revoke a previously issued approval if it finds that, based on new evidence, the approved system does not adequately protect the soil and beneficial uses of groundwater from unauthorized releases.Cal. Code Regs. Tit. 23, § 2636
1. New section filed 4-5-94; operative 5-5-94 (Register 94, No. 14).
2. Amendment of subsections (f)-(f)(3) and (g)-(g)(4), new subsections (h)-(h)(3)(C) and amendment of NOTE filed 5-14-2001; operative 5-14-2001 pursuant to Government Code section 11343.4 (Register 2001, No. 20).
3. Amendment of subsections (f)(2)-(4), new subsections (f)(5)-(6), repealer of subsections (g)-(g)(5), subsection relettering and amendment of newly designated subsections (g)(1)(C) and (g)(3) filed 4-8-2004; operative 5-8-2004 (Register 2004, No. 15).
4. Amendment of subsections (c)(2) and (f)(3) filed 12-18-2007; operative 1-17-2008 (Register 2007, No. 51).
5. Amendment of section and NOTE filed 10-13-2016; operative 1-1-2017 (Register 2016, No. 42).
6. Amendment of section and NOTE filed 8-27-2018; operative 10-1-2018 (Register 2018, No. 35). Note: Authority cited: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25281, 25284.1, 25291, 25296.35, 25299 and 25404, Health and Safety Code; and 40 CFR §§ 280.10, 280.20, 280.31, 280.40, 280.41, 280.42, 280.43, 280.44 and 280.45.
1. New section filed 4-5-94; operative 5-5-94 (Register 94, No. 14).
2. Amendment of subsections (f)-(f)(3) and (g)-(g)(4), new subsections (h)-(h)(3)(C) and amendment of Notefiled 5-14-2001; operative 5-14-2001 pursuant to Government Code section 11343.4 (Register 2001, No. 20).
3. Amendment of subsections (f)(2)-(4), new subsections (f)(5)-(6), repealer of subsections (g)-(g)(5), subsection relettering and amendment of newly designated subsections (g)(1)(C) and (g)(3) filed 4-8-2004; operative 5-8-2004 (Register 2004, No. 15).
4. Amendment of subsections (c)(2) and (f)(3) filed 12-18-2007; operative 1-17-2008 (Register 2007, No. 51).
5. Amendment of section and Note filed 10-13-2016; operative 1/1/2017 (Register 2016, No. 42).
6. Amendment of section and Note filed 8-27-2018; operative 10/1/2018 (Register 2018, No. 35).