1. (a) A leak monitoring system shall be installed for:

   1. (1) Each pressure piping system, exclusive of vent piping, installed on or after November 2, 1990;
   2. (2) Each piping system not included in (1), above, exclusive of vent piping and vertical tank risers, installed on or after April 24, 1997; and
   3. (3) Each piping system not included in (1) or (2), above, exclusive of vent piping and vertical tank risers, as required by Env-Or 408.05(c).

2. (b) All pressurized piping shall be equipped with a UL-listed automatic line leak detector that:

   1. (1) Restricts or stops the flow of the stored substance and triggers an audible or visual alarm upon detecting a leak at a rate equivalent to 3 gallons per hour at a pressure of 10 pounds per square inch line pressure; and
   2. (2) Meets the requirements of 40 CFR 280.40(a)(3).
3. (c) The interstitial space of the double wall piping or the annular space between the primary piping and the secondary containment system shall be continuously monitored to detect both water and the regulated substance.
4. (d) The piping sump shall have a leak monitor sensor to detect both water and the regulated substance.

Source. (See Revision Note #1 at chapter heading for Env-Or 400) #10393, eff 9-1-13; ss by #12643, eff 10-10-18 (See Revision Note #2 at chapter heading for Env-Or 400)