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PEURP1200-12 records or the ATG readout. Prepare a monitoring fluid solution to add to the interstitial space. 4.3.6 Steel Tanks. Liquid-filled (hydrostatic) tests on steel tanks require the same fluid as the monitoring fluid. Contact the manufacturer for instructions. 4.3.7 Fiberglass Tanks. Determine tank size and diameter and apply the appropriate method. 4.3.8 Test Equipment. Test equipment shall include: monitoring fluid; stopwatch or other time-measurement device capable of measuring a 1-second increment; tape measure. 4.3.9 Test Procedure. Remove any sensor that may be installed in the tank interstitial space. Determine and record the groundwater level. Add test liquid to the tank interstitial space bringing the fluid level into the riser (stand- pipe) to the appropriate level based on the manufacturer's written procedure. Document the starting level and start time of the test. Start the time-measurement device. Wait the appropriate time according to the manufacturer's test procedure. Document the ending level and ending time of the test. Determine and record the groundwater level. Remove liquid added to the tank interstitial space, and restore the liquid level in the tank interstitial to normal operating condition. Reinstall the sensor so that it is installed within manufacturer's specifications. 4.3.10 Pass/Fail Criteria. Compare the data to the manufacturer's pass/fail criteria in Appendix A to determine if the tank has passed the test AMIN 5. PIPING SECONDARY CONTAINMENT INTEGRITY TESTING 5.1 General. Underground product piping is available with single and double walls. Double-walled piping pro- vides containment for leaks from primary containment and must be leak-free to prevent release of product into the environment. 5.2 Purpose. This method is used to test the integrity of piping interstitial space(s). 5.3 Description of Test. The interstitial space is sealed at the ends and is pressurized with an inert gas. The pressure is monitored for 1 hour. If any pressure drop occurs, the secondary containment fails the test. 5.4 Test Conditions. The primary pipe may contain fuel, and dispensing activities may continue during the test without affecting test results. 5.5 Preparation. If the interstitial space contains prod- uct, ensure that the interstice is open to the atmosphere and perform a precision test on the primary piping before conducting a test on the secondary containment piping. Termination fittings must be sealed at all piping termina- tions, and test fittings must be accessible to perform the test. Check with the piping manufacturer regarding testing procedures and the proper pressure before testing. Test- FIGURE 51. Boots on piping transitions and through sump walls must be leak-tight when piping secondary containment integrity testing is performed. pei.org