25 Pa. Code § 245.523 - Aboveground storage tanks in under-ground vaults
The following requirements shall be met when an owner or operator chooses to install an aboveground storage tank in an underground vault:
(1) The vault shall completely
enclose the aboveground storage tank. There may be no openings in the vault
enclosure except those necessary for access to, inspection of, and filling,
emptying and venting of the tank. The walls and floor of the vault must be
constructed of reinforced concrete at least 6 inches thick. The top, walls and
floor shall be designed to withstand the anticipated loading, including loading
from traffic, soil and groundwater.
(2) The vault must be compatible with the
stored substance and have a permeability of less than 1 x
10-7 cm/sec for substance stored and be water
tight.
(3) An aboveground storage
tank must be in its own vault. Adjacent vaults may share a common
wall.
(4) There may be no backfill
around the aboveground storage tank and there shall be sufficient space between
the tank and the vault to allow inspection of the tank and ancillary
equipment.
(5) Vaults and
aboveground storage tanks must be suitably anchored to withstand uplifting by
either water or released substance, including when the tank is empty.
(6) Connections shall be provided to permit
venting of each vault to dilute, disperse and remove vapors prior to personnel
entering the vault.
(7) A vault
must be equipped with a continuous leak detection system capable of detecting
vapors and liquids including water. The detection system must activate an alarm
that automatically shuts down the dispensing system if vapors or liquids are
detected.
(8) A vault must have a
means for personnel entry. The entry point must have a warning sign indicating
the need for procedures for safe entry into a confined space. An entry point
must be secured against unauthorized entry and vandalism.
(9) A suitable means to admit a fire
suppression agent shall be provided for each vault.
(10) Aboveground storage tanks and ancillary
equipment shall be installed, maintained and inspected in accordance with the
requirements for aboveground storage tanks in this subchapter.
(11) Underground piping distribution systems
for each aboveground storage tank system used to dispense class I or class II
motor fuels for resale must be provided with release detection equivalent to
underground piping release detection addressed in §
245.445 (relating to methods of
release detection for piping) and monitored as required in paragraph (7) with
monitoring records retained for 12 months as required under §
245.516 (relating to recordkeeping
requirements).
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