8.85. Every connection to underground piping that has not been leak tested under section 8.84 must, after being connected to the tank, be subjected to an air leak test or nitrogen leak test conducted in compliance with the following requirements:(1) a safety valve of not more than 40 kPa capable of discharging the flow from the pressure source must be installed and inspected before each test;
(2) the pressure created inside the tank and the piping must be measured using a pressure gauge calibrated in units of not more than 1 kPa;
(3) a pressure of not less than 30 kPa and not more than 35 kPa must be applied over the entire petroleum equipment installation being tested;
(4) all the connections between the tank and the piping must be leak tested with leak detection fluid while the entire installation is under pressure; and
(5) once the temperature has been stabilized and the pressure source removed, the pressure must be maintained for at least 1 hour.