Every underground storage tank installed after January 1, 1984, shall meet all of the following requirements: (a) The underground storage tank shall be designed and constructed to provide primary and secondary levels of containment of the hazardous substances stored in it in accordance with the following performance standards: (1) Primary containment shall be product-tight and compatible with the substance stored. (2) Secondary containment shall be constructed to prevent structural weakening as a result of contact with any released hazardous substances, and also shall be capable of storing the hazardous substances for the maximum anticipated period of time necessary for the recovery of any released hazardous substance. (3) In the case of an installation with one primary container, the secondary containment shall be large enough to contain at least 100 percent of the volume of the primary tank. (4) In the case of multiple primary tanks, the secondary container shall be large enough to contain 150 percent of the volume of the largest primary tank placed in it, or 10 percent of the aggregate internal volume of all primary tanks, whichever is greater. (5) If the facility is open to rainfall, then the secondary containment shall be able to additionally accommodate the maximum volume of a 24-hour rainfall as determined by a 25-year storm history. (6) Single-walled containers do not fulfill the requirement of an underground storage tank providing both a primary and a secondary containment. However, an underground storage tank with a primary container constructed with a double complete shell shall be deemed to have met the requirements for primary and secondary containment set forth in this section if all of the following criteria are met: (A) The outer shell is constructed primarily of nonearthen materials, including, but not limited to, concrete, steel, and plastic, which provide structural support and a continuous leak detection system with alarm is located in the space between the shells. (B) The system is capable of detecting the entry of hazardous substances from the inner container into the space. (C) The system is capable of detecting water intrusion into the space from the outer shell. (7) Underground storage tanks for motor vehicle fuels installed before January 1, 1997, may be designed and constructed in accordance with this paragraph in lieu of the requirements of paragraphs (1) to (6), inclusive, if all of the following conditions exist: (A) The primary containment construction is of glass fiber reinforced plastic, cathodically protected steel, or steel clad with glass fiber reinforced plastic. (B) Any alternative primary containment is installed in conjunction with a system that will intercept and direct a leak from any part of the underground storage tank to a monitoring well to detect any release of motor vehicle fuels. (C) The system is designed to provide early leak detection and response, and to protect the groundwater from releases. (D) The monitoring is in accordance with the alternative method identified in paragraph (4) of subdivision (b) of Section 25292. This subparagraph does not apply to tanks designed, constructed, and monitored in accordance with paragraph (6). (E) Pressurized piping systems connected to tanks used for the storage of motor vehicle fuels and monitored in accordance with paragraph (4) of subdivision (b) of Section 25292 also meet the conditions of this subdivision if the tank meets the conditions of subparagraphs (A) to (D), inclusive. However, any pipe connected to an underground storage tank installed after July 1, 1987, shall be equipped with secondary containment that complies with paragraphs (1) to (6), inclusive. (b) The underground tank system shall be designed and constructed with a monitoring system capable of detecting the entry of the hazardous substance stored in the primary containment into the secondary containment. (c) The underground storage tank shall be provided with equipm
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