Section 2633 - Alternate Construction Requirements for New Underground Storage Tanks Containing Motor Vehicle Fuel(a) This section sets forth alternate construction requirements for new underground storage tanks which contain only motor vehicle fuels. Owners or operators of new underground storage tanks which contain only motor vehicle fuels may comply with this section in lieu of section 2631. If the tanks are constructed in accordance with the requirements of this section, they shall be monitored in accordance with section 2634.(b) Underground storage tanks used for storage of motor vehicle fuel and constructed in accordance with this section shall be composed of fiberglass-reinforced plastic, cathodically protected steel, or steel clad with fiberglass-reinforced plastic. These tanks shall be installed with the leak interception and detection system constructed in accordance with the requirements of subsections (d) through (f). The primary containment system shall meet the requirements of sections 2631(b) and 2631(c).(c) Underground storage tanks used for storage of motor vehicle fuel that are constructed of materials other than those specified in subsection (b) shall be constructed in accordance with section 2631 and monitored in accordance with section 2631 and monitored in accordance with section 2632.(d) The floor of a leak interception and detection system shall be constructed on a firm base and sloped to a collection sump. Methods of construction for a leak interception and detection system using membrane liners shall comply with the requirement of section 2631(d)(6).(e) Access casings shall be installed in the collection sump of a secondary containment system which has backfill in the interstitial space. The access casing shall be: (1) Designed and installed to allow the liquid to flow into the casing;(2) Sized to allow efficient removal of collected liquid and to withstand all anticipated applied stresses using appropriate engineering safety factors;(3) Constructed of materials that will not be structurally weakened by the stored hazardous substances or donate, capture, or mask constituents for which analyses will be made;(4) Screened along the entire vertical zone of permeable material which may be installed between the primary container and the leak interception and detection system;(5) Capable of preventing leakage of any hazardous substance from the casing to areas outside the leak interception and detection system;(6) Extended to the ground surface and covered with a locked waterproof cap or enclosed in a secured surface structure that will protect the access casing(s) from entry of surface water, accidental damage, unauthorized access, and vandalism. A facility with locked gates will satisfy the requirements for protection against unauthorized access and vandalism; and(7) Capable of meeting requirements of local well-permitting agencies.(f) The leak interception and detection system shall prevent the leaked hazardous substance from entering ground water. The leak interception and detection system shall be situated above the highest anticipated ground water elevation. Proof that the leak interception and detection system will protect ground water shall be demonstrated by the owner or operator of the underground storage tank to the satisfaction of the local agency. In determining whether the leak interception and detection system will adequately protect ground water, the local agency shall consider the following: (1) The containment volume of the leak interception and detection system;(2) The maximum leak which could go undetected under the monitoring method required in section 2634 and the maximum period during which the leak will go undetected;(3) The frequency and accuracy of the proposed method of monitoring the leak interception and detection system;(4) The depth from the bottom of the leak interception and detection system to the highest anticipated level of ground water;(5) The nature of the unsaturated soils under the leak interception and detection system and their ability to absorb contaminants or to allow movement of contaminants;(6) The effect of any precipitation or subsurface infiltration on the movement of any leak of hazardous substance and the available volume of the leak interception and detection system; and(7) The nature and timing of the response plan required by section 2634 to clean up any hazardous substances which have been discharged from the primary container.Cal. Code Regs. Tit. 23, § 2633
1. Amendment 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. Amendment of section heading and text filed 4-5-94; operative 5-5-94 (Register 94, No. 14). Note: Authority cited: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25281 and 25291, Health and Safety Code; 40 CFR 280.20.
1. Amendment 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. Amendment of section heading and text filed 4-5-94; operative 5-5-94 (Register 94, No. 14).