If API Std 2015 is used, flooding the tank should
not be used in any circumstances.
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The tank interior shall be [cleaned using a high pressure (greater than
3.45 MPa 500 psi), low volume (less than 0.13 L/s 2 gpm) water spray] [or]
[steam cleaned] until all loose scale and sludge is removed, and
contamination, in the form of a sheen, is no longer visible in the effluent
stream. The interior surfaces of piping shall also be cleaned, to the
extent possible, using the same method used for cleaning the tank.
Contaminated water generated from interior cleaning operations (of both
piping and tank) shall not exceed the following quantities for each UST
cleaned:
UST VOLUME (LITERS)
PERCENT OF UST VOLUME
3,785 or less
5
37,850 or less
5 or 378 L, whichever is less
75,700 or less
1 or 568 L, whichever is less
greater than 75,700
1 or 946 L, whichever is less
UST VOLUME (GALLONS)
PERCENT OF UST VOLUME
1,000 or less
5
10,000 or less
5 or 100 gal., whichever is less
20,000 or less
1 or 150 gal., whichever is less
greater than 20,000
1 or 250 gal., whichever is less
All contaminated water resulting from cleaning operations shall be
[collected and stored on site] [discharged to the installation sanitary
sewer after passing through an oil water separator] [handled in accordance
with paragraph Contaminated Water Disposal]. Cleaning shall be
accomplished eliminating, to the greatest extent possible, the need for
personnel to enter the tank. Cleaning shall be done using specially
designed tank cleaning equipment which allows the tank to be cleaned prior
to cutting into sections without requiring personnel to enter the tank or,
if less specialized equipment is used, the tank shall be partially
dissected to overcome confined space entry hazards. This work shall be
accomplished in accordance with Section 01351 SAFETY, HEALTH, AND EMERGENCY
RESPONSE (HTRW/UST).
3.10
SOIL EXAMINATION, TESTING, AND ANALYSIS
3.10.1
Tank Excavation Sampling Procedures
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NOTE: The designer will detail the confirmation
soil sampling requirements and analytical
parameters, including pipe trenches and near pump
islands, based on the state/local regulations, EM
1110-3-178 and EM 200-1-3.
In most cases,
a 72-hour turnaround-time (TAT) is
appropriate to
avoid excessive downtime or
remobilization
of the Contractor; determine if a
quicker TAT is
warranted for the off-site analytical.
If the State will have an individual onsite to
SECTION 02115A
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