Section Env-Or 405.07 - Dispensing Areas(a) Each dispensing area installed on or after February 3, 2005 shall have a concrete pad with positive limiting barriers that: (1) Are con structed and maintained to contain a volume of at least 5 gallons regardless of which dispenser releases the regulated substance; and(2) Extend beyond the reach of all dispensing nozzles.(b) Each dispensing area installed or replaced on or after the 2018 effective date of this chapter shall have a concrete pad with positive limiting barriers (PLBs) that: (1) Is constructed of reinforced Portland cement concrete that meets the requirements of NHDOT Standard Specifications for Road and Bridge Construction dated 2016;(2) Has liquid-tight joints at all expansion, contraction, crack control, and cold joints in all components of the dispensing area, including but not limited to dispensing islands, bollards, canopy supports, canopy drainage pipes, and utility sleeves, that have been sealed and maintained with a sealant that is compatible with the regulated substance and has been installed as provided in its manufacturer's instructions;(3) Is provided with control joints that are: a. Spaced at a minimum of 24 times the pad thickness, for example every 12 feet for a 6-inch thick pad, to control shrinkage and undirected cracking, but not located directly in front of a dispenser;b. Cut or formed into the pad surface to a depth of 25% of the pad thickness; andc. Sealed per (b)(2), above;(4) Does not contain any manways, spill containment, other such tank pad appurtenances, drains, or other avenues that could allow spilled regulated substances to seep into the ground, provided, however, that design plans may show such appurtenances as part of an island that is raised above the tank pad;(5) Is constructed with: a. A minimum slope of 1/8 inch per foot starting at the dispensing islands and extending downward and radially outward to PLBs at a level perimeter; orb. If site conditions prevent a level perimeter, downgradient PLBs that have been constructed to ensure containment per (6), below;(6) Is constructed and maintained to contain a volume of at least 5 gallons regardless of which dispenser releases the regulated substance; and(7) Fully extends beyond the reach of all dispensing nozzles as measured with the nozzle 3 feet above the dispensing pad.(c) For a facility undergoing a substantial modification of an existing dispensing area on or after the 2018 effective date of this chapter, if more than 50% of the pad area will be removed during construction or is cracked, chipped, or otherwise damaged to the extent that the ability of the pad to prevent product from passing through it has been compromised, the owner shall replace the entire pad per (b), above, as existing spacing allows.(d) Each dispenser shall have a liquid-tight dispenser sump directly beneath it to contain discharges.(e) Dispenser sumps shall be: (1) Provided with continuous leak detection monitoring by the piping sump sensor; or(2) Equipped with a sump sensor.(f) Any dispenser sump that is part of a UST system installed on or after September 1, 2013 shall be equipped with a sump sensor in the lowest point of the sump.(g) For any UST system installed prior to February 3, 2005 that does not have an existing concrete dispensing pad, the owner shall install a dispensing pad meeting the requirements of (a) and (b), above, no later than October 13, 2021.(h) For any UST system at a marina that does not have an existing concrete dispensing pad for onshore dispensers, the owner shall install a dispensing pad meeting the requirements of Env-Or 407.10(g) and (h), as applicable, no later than October 13, 2021.N.H. Admin. Code § Env-Or 405.07
(See Revision Note at chapter heading for Env-Or 400) #10393, eff 9-1-13
Amended by Volume XXXVIII Number 45, Filed November 8, 2018, Proposed by #12643, Effective 10/10/2018, Expires 10/10/2028.