Section Env-Or 305.14 - Release Detection for AST Systems(a) The owner of an AST system installed on or after April 25, 1997 shall provide, as applicable: (1) Beneath a tank that is not completely raised above ground level, perforated gravity collection pipes or channels that can be monitored for the presence of a release; or(2) Beneath a vertical tank, a finished concrete pad that extends completely beneath the tank and has a series of channels measuring no more than 1.5 inches wide and 0.75 inches deep extending radially outward from the center of the pad to beyond the edge of the tank.(b) All pressurized underground and over-water motor fuel dispenser piping systems installed on or after May 28, 2005 shall:(1) Be equipped with a UL-listed line leak detector capable of detecting a line leakage rate of 3 gallons per hour at 10 pounds per square inch; and(2) Automatically shut-off or restrict product flow if the leakage rate is exceeded.N.H. Admin. Code § Env-Or 305.14
(See Revision Note at chapter heading for Env-Or 300) #10487, eff 2-7-14