3.9
TANK CLEANING
3.9.1
Exterior
Soil shall be removed from the exterior of the tank, piping, and associated
equipment to eliminate soil deposition on roadways during transportation to
a temporary storage area, ensure markings will adhere to the surfaces, and
simplify tank cutting. Soil shall be removed using non-sparking tools.
Removed uncontaminated soil and soil not regulated by the state as a
hazardous waste shall be recovered [and used as backfill in the former tank
excavation] [and] [or] [disposed of onsite]. Soil believed to be
contaminated shall be removed and containerized, or if the site is a RCRA
designated CAMU, collected on 3 layers of [0.152] [0.762] [_____] mm [6]
[30] [_____] mil impermeable geomembrane and stockpiled with other
contaminated soil removed from the excavation.
3.9.2
Temporary Storage
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NOTE: Add any special state/local regulatory
requirements.
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If the tank is stored after the tank exterior is cleaned and ancillary
equipment is removed, and prior to being cut into sections, the tank shall
be labeled as directed in API RP 1604, placed on blocks, and temporarily
stored [on a flat area adjacent to the excavation] [at the location
indicated on the drawings] [in the area of the existing tank site]. Prior
to cleaning the tank interior the tank atmosphere shall be monitored for
combustible vapors and purged or inerted if combustible vapors are detected.
3.9.3
Interior
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NOTE: In lieu of eliminating any sheen, many states
require a triple rinse. Coordinate with the
appropriate regulators to ascertain what "clean" is,
regarding tank interiors and to determine cleaning
requirements for the piping and ancillary equipment;
cleaning operations are highly dependent upon tank
material and contents, and which state requirements
are applicable. Often the state fire inspector's
office has been tasked with Subtitle I program
implementation; hence the following NFPA and API
standards may be used to a greater degree than in
situations in which another office of state
government has been tasked with enforcing the UST
regulations.
NFPA-30 Flammable and Combustible Liquids Codes
NFPA-327 Standard Procedure for Cleaning or
Safeguarding Small Tanks and Containers
NFPA-329 Recommended Practice for Handling
Underground Leakage of Flammable and Combustible
Liquids
API Std 2015 Cleaning Petroleum Storage Tanks
SECTION 02115A
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