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Cal. Code Regs. Title 23, Division 3, Chapter 16, Underground Tank Regulations of practice or engineering standard approved by a state registered professional engineer. The following requirements shall also apply: (1) All bench materials shall be compatible with the substance stured 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 psi, 40 psi shall be used as the test pressure. The pressure shall be maintained for a minimum of 30 minutes and all joints shall he 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 ofscetion 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 3 - gallon per hour leak rate at 10 psi within 1 hour with a probability of detection of at least 95 percent and a probability of false alarm no greater than 5 percent, and shall restrict or shut off the flow of product through the piping when a leak is detected. (3) Until November 9, 2004, other monitoring methods may be used in lieu of the requirement in subdivision (2) if it is demonstrated to the satisfaction of the local agency that the alternate method is as effective as the methods otherwise required by this section. Continuous monitoring systems as described in subdivision (1), which shut down the pump in addition to either activating the audible and visual alarm or stopping the flow of product at the dispenser, satisfy the automatic line leak detector requirement of subdivision (2). (4) Monitoring shall be conducted on all underground pressurized piping with secondary containment at least annually at a pressure designated by the equipment manufacturer, provided that the method is capable of detecting a minimum release equivalent to 0.1 gallon 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 ofdetcction and not more than a 5 percent probability of false alarm. (5) Continuous monitoring systems as described in subdivision (!)(f) satisfy the annual tightness testing requirement of subdivision (f)(4) if both of the following conditions are met: (A) The monitoring system shuts down the pump or stops the now of product at the dispenser when a leak is detected in the tinder- dispenser containment. (Fl) 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. (6) For emergency generator tank systems, continuous monitoring systems as described in subdivision (1), 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 subdivision (2), provided that the monitoring system is 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. (g) Under -dispenser containment shall be designed, constructed, and installed in accordance with the following: (1) Owners or Operators ora UST system shall have the system fitted with under -dispenser containment, or an approved tinder -dispenser spill containment or control system according to the following schedule: 19