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HSC 25284.2 Annual spill containment testing. The owner or operator of an underground storage tank with a spill containment structure designed to prevent a release in the event of a spill or overfill while a hazardous substance is being placed in the tank shall annually test the spill containment structure to demonstrate that it is capable of containing the substance until it is detected and cleaned up. 4 Annual spill container testing was due by December 2008, and was performed on May 19, 2009, five months late. HSC 25290.1 Secondary containment is not liquid tight. (c) 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 constructed, operated, and maintained product tight and compatible with the stored product. (2) Secondary containment shall be constructed, operated, and maintained product tight. The secondary containment shall also be constructed, operated, and maintained in a manner to prevent structural weakening as a result of contact with any hazardous substances released from the primary containment, 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) Secondary containment shall be constructed, operated, and maintained to prevent any water intrusion into the system by precipitation, infiltration, or surface runoff. (4) In the case of an installation with one primary tank, the secondary containment shall be large enough to contain at least 100 percent of the volume of the primary tank. (5) In the case of multiple primary tanks, the secondary containment 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. 4 Three gallons of liquid were found in the 91 -octane fill sump during the May 19, 2009, UST inspection. HSC 25291(b) UST system monitoring equipment is operational. 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. 4 The 87 -octane tank annular sensor and 91 -octane product piping smart liquid sensor failed a functionality test on May 19, 2009. HSC 25292.2(a) Certification of financial responsibility and chief financial officer letter. All owners and operators of an underground tank system shall maintain evidence of financial responsibility for taking corrective action and for compensating third parties for bodily injury and property damage caused by a release from the underground tank system, in accordance with regulations adopted by the board pursuant to Section 91