Current through Register Vol. 50, No. 9, September 20, 2024
A. Hazardous wastes or treatment reagents
must not be placed in a tank system if they could cause the tank, its ancillary
equipment, or the containment system to rupture, leak, corrode, or otherwise
fail.
B. The owner or operator must
use appropriate controls and practices to prevent spills and overflows from
tank or containment systems. These include at a minimum:
1. spill prevention controls (e.g., check
valves, dry disconnect couplings);
2. overfill prevention controls (e.g., level
sensing devices, high level alarms, automatic feed cutoff or bypass to a
standby tank); and
3. maintenance
of sufficient freeboard in uncovered tanks to prevent overtopping by wave or
wind action or by precipitation.
C. The owner or operator must comply with the
requirements of LAC 33:V.1913 if a leak or spill occurs in the tank
system.
D. Owners or operators must
provide documentation, maintained on-site, that batch tanks subject to the
accumulation time exclusions of LAC 33:V.1013.C and 1015.B have been emptied
and cleaned of all residues and/or sludges at least once in each 90-day period
for large quantity generators and at least once in each 180-day period for
small quantity generators.
1. A batch tank is
deemed emptied and cleaned for the purposes of this Subsection if it has been
emptied to the maximum extent practicable and:
a. for tanks used to store similar wastes
(compatible), cleaning/rinsing or removal of hazardous waste to a level at
which no more than 2.5 centimeters (1 inch) of waste on the bottom of the tank
or 3 percent by volume of the total tank capacity remains in the tank is
required; or
b. for tanks that may
be used to store dissimilar (incompatible) wastes, cleaning/rinsing by
method(s) necessary to remove all hazardous wastes to a level which precludes
any incompatibility reactions and is sufficient to allow visible inspection of
all tank interior surfaces is required.
2. Notwithstanding the provisions of
Paragraph D.1 of this Section, except to the extent otherwise approved by the
administrative authority, batch tanks subject to the accumulation time
exclusions of LAC 33:V.1013.C and 1015.B must be completely emptied and cleaned
once per year to a level sufficient to allow visual inspection of all tank
interior surfaces.
E.
Owners or operators must provide documentation, maintained on-site, that
continuous-flow tanks subject to the accumulation time exclusions of LAC
33:V.1013.C and 1015.B have been emptied at least once in each 90-day period
for large quantity generators and once in each 180-day period for small
quantity generators.
1. A continuous-flow
tank is deemed emptied if the owner or operator can demonstrate, via a mass
balance approach and appropriate documentation or methodology, that hazardous
waste has not been stored therein for more than the accumulation time limits.
The key parameters in the mass balance approach are the volume of the tank, the
daily throughput of the hazardous waste, and the time period the hazardous
waste "resides" in the tank. As an example, in the case of a large quantity
generator with a 6,000 gallon tank and daily throughput of 300 gallons per day,
the hazardous waste would have a residence time of 20 days (i.e., 6,000
gallons/300 gallons per day) and would meet the requirements of LAC 33:V.1015.B
since the hazardous waste has been in the tank for less than 90 days.
2. The documentation or methodology that is
used by the owner or operator to confirm a continuous-flow tank's compliance
with Paragraph E.1 of this Section must be reasonable and easily discernible to
the department.
3. A
continuous-flow tank in which a significant amount of residue or sludge is
accumulated may not qualify for the accumulation time exclusions of LAC
33:V.1013.C and 1015.B. Therefore, the owner or operator of a continuous-flow
tank for which that exclusion is claimed must ensure that significant
accumulation of residue or sludge does not occur in the tank by satisfying the
requirements either of Subsection D of this Section (in which case the words
"continuous-flow tank" shall be substituted for the words "batch tank" in each
instance where "batch tank" appears in that Subsection), or of Paragraph E.4 of
this Section.
4. The owner or
operator must provide documentation, maintained on-site, establishing that
significant accumulations of residue or sludge do not occur within the tank;
i.e., almost all residues or sludges in the tank at the beginning of the 90-day
or 180-day accumulation period have been removed (or displaced by incoming
waste or newly-formed residues or sludges) by the end of the 90-day or 180-day
accumulation period. The determination of what constitutes "significant
accumulation of residue or sludge" shall be made on a case-by-case basis.
However, no significant accumulation of residues or sludges shall be deemed to
have occurred if the residues or sludges that accumulate in the tank constitute
less than 5 percent by volume of the total tank capacity. To the extent that
there is no significant accumulation of residue or sludge in the tank, the
one-year storage prohibition under LAC 33:V.2205 shall not apply to any residue
or sludge contained therein.
AUTHORITY NOTE:
Promulgated in accordance with
R.S.
30:2180 et
seq.
