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•'i <br /> It TITLE 3 <br /> section 2635(d). The certification shall be made on the "Certification of <br /> Compliance for Underground Storage Tank Installation Form C" (see <br /> Appendix V). <br /> (d) Lined trench systems used as part of a secondary containment system shall be <br /> designed and constructed according to a code of practice or engineering standard <br /> approved by a state registered professional engineer. The following requirements <br /> shall also apply: <br /> (1) All trench materials shall be compatible with the substance stored and <br /> evaluated by an independent testing organization for their compatibility or <br /> adequacy of the trench design, construction, and application; and <br /> (2) The trench shall be covered and capable of supporting any expected <br /> vehicular traffic. <br /> (e) All new primary piping and secondary containment systems shall be tested for <br /> tightness after installation in accordance with manufacturer's guidelines. 'Primary <br /> pressurized piping shall be tested for tightness hydrostatically at 150 percent of <br /> design operating pressure or pneumatically at 110 percent of design operating <br /> pressure. If the calculated test pressure for pressurized piping is less than 40 psi, 4 <br /> 40 psi shall be used as the test pressure. The pressure shall be maintained for a <br /> minimum of 30 minutes and all joints shall be soap tested. A failed test, as <br /> evidenced by the presence of bubbles, shall require appropriate repairs and <br /> retesting. If there are no manufacturer's guidelines, secondary containment <br /> systems shall be tested using an applicable method specified in an industry code or }„ <br /> engineering standard. Suction piping and gravity flow piping which cannot be <br /> isolated from the tank shall be tested after installation in conjunction with an <br /> overfilled volumetric tank integrity test, or other test method meeting the <br /> requirements of section 2643(f), if approved by the local agency. <br /> (f) Underground piping with secondary containment shall be equiDped and monitore <br /> as follows: <br /> (1) The secondary containment system shall be equipped with a continuous <br /> monitoring system which meets the requirements of section 2643(f) and <br /> which is connected to an audible and visual alarm system. <br /> (2) Automatic line leak detectors shall be installed on underground pressurized <br /> piping and sha a capable of detecting a 3-gallon per hour leak rate at 10 <br /> psi within 1 hour with a probability of detection of at least 45 percent and a <br /> probability of false alarm no greater than 5 percent. Compliance with these <br /> standards shall be certified in accordance with section 2643(f) of Article 4. <br /> 30 <br />