Wisconsin Administrative Code › Department of Natural Resources › NR 600-699 - Environmental Protection - Hazardous Waste Management › Chapter NR 661 - Hazardous Waste Identification And Listing › Subchapter D - Lists of Hazardous Wastes › Section NR 661.0032 - Hazardous wastes from specific sources

Current through June 24, 2024
(1) LISTED
				  HAZARDOUS WASTES FROM SPECIFIC SOURCES. The following solid wastes are listed
				  hazardous wastes from specific sources unless they are excluded under ss.
				  NR
				  660.20 and 660.22 and listed in 40 CFR part 261,
				  Appendix IX:
Industry and EPA hazardous waste
								  number
Hazardous waste
Hazard code
Wood preservation:
K001
Bottom sediment sludge from the treatment of
								  wastewaters from wood preserving processes that use creosote or
								  pentachlorophenol.
(T)
Inorganic pigments:
K002
Wastewater treatment sludge from the production
								  of chrome yellow and orange pigments.
(T)
K003
Wastewater treatment sludge from the production
								  of molybdate orange pigments.
(T)
K004
Wastewater treatment sludge from the production
								  of zinc yellow pigments.
(T)
K005
Wastewater treatment sludge from the production
								  of chrome green pigments.
(T)
K006
Wastewater treatment sludge from the production
								  of chrome oxide green pigments, anhydrous and hydrated.
(T)
K007
Wastewater treatment sludge from the production
								  of iron blue pigments.
(T)
K008
Oven residue from the production of chrome oxide
								  green pigments.
(T)
Organic chemicals:
K009
Distillation bottoms from the production of
								  acetaldehyde from ethylene.
(T)
K010
Distillation side cuts from the production of
								  acetaldehyde from ethylene.
(T)
K011
Bottom stream from the wastewater stripper in the
								  production of acryloni-trile.
(R, T)
K013
Bottom stream from the acetonitrile column in the
								  production of acryloni-trile.
(R, T)
K014
Bottoms from the acetonitrile purification column
								  in the production of acry-lonitrile.
(T)
K015
Still bottoms from the distillation of benzyl
								  chloride.
(T)
K016
Heavy ends or distillation residues from the
								  production of carbon tetrachlo-ride.
(T)
K017
Heavy ends, still bottoms, from the purification
								  column in the production of epichlorohydrin.
(T)
K018
Heavy ends from the fractionation column in ethyl
								  chloride production.
(T)
K019
Heavy ends from the distillation of ethylene
								  dichloride in ethylene dichloride production.
(T)
K020
Heavy ends from the distillation of vinyl
								  chloride in vinyl chloride monomer production.
(T)
K021
Aqueous spent antimony catalyst waste from
								  fluoromethanes production.
(T)
K022
Distillation bottom tars from the production of
								  phenol/acetone from cumene.
(T)
K023
Distillation light ends from the production of
								  phthalic anhydride from naphthalene.
(T)
K024
Distillation bottoms from the production of
								  phthalic anhydride from naphthalene.
(T)
K025
Distillation bottoms from the production of
								  nitrobenzene by the nitration of benzene.
(T)
K026
Stripping still tails from the production of
								  methy ethyl pyridines.
(T)
K027
Centrifuge and distillation residues from toluene
								  diisocyanate production.
(R, T)
K028
Spent catalyst from the hydrochlorinator reactor
								  in the production of 1,1,1-trichloroethane.
(T)
K029
Waste from the product steam stripper in the
								  production of 1,1,1-trichloro-ethane.
(T)
K030
Column bottoms or heavy ends from the combined
								  production of trichloro-ethylene and perchloroethylene.
(T)
K083
Distillation bottoms from aniline
								  production.
(T)
K085
Distillation or fractionation column bottoms from
								  the production of chloro-benzenes.
(T)
K093
Distillation light ends from the production of
								  phthalic anhydride from ortho-xylene.
(T)
K094
Distillation bottoms from the production of
								  phthalic anhydride from ortho-xylene.
(T)
K095
Distillation bottoms from the production of
								  1,1,1-trichloroethane.
(T)
K096
Heavy ends from the heavy ends column from the
								  production of 1,1,1-tri-chloroethane.
(T)
K103
Process residues from aniline extraction from the
								  production of aniline.
(T)
K104
Combined wastewater streams generated from
								  nitrobenzene or aniline production.
(T)
K105
Separated aqueous stream from the reactor product
								  washing step in the production of chlorobenzenes.
(T)
K107
Column bottoms from product separation from the
								  production of 1,1-dimethylhydrazine, UDMH, from carboxylic acid
								  hydrazides.
(C, T)
K108
Condensed column overheads from product
								  separation and condensed reactor vent gases from the production of
								  1,1-dimethylhydrazine, UDMH, from carboxylic acid hydrazides.
(I, T)
K109
Spent filter cartridges from product purification
								  from the production of 1,1-dimethylhydrazine, UDMH, from carboxylic acid
								  hydrazides.
(T)
K110
Condensed column overheads from intermediate
								  separation from the production of 1,1-dimethylhydrazine, UDMH, from carboxylic
								  acid hydrazides.
(T)
K111
Product washwaters from the production of
								  dinitrotoluene via nitration of toluene.
(C, T)
K112
Reaction by-product water from the drying column
								  in the production of tolu-enediamine via hydrogenation of
								  dinitrotoluene.
(T)
K113
Condensed liquid light ends from the purification
								  of toluenediamine in the production of toluenediamine via hydrogenation of
								  dinitrotoluene.
(T)
K114
Vicinals from the purification of toluenediamine
								  in the production of tolu-enediamine via hydrogenation of
								  dinitrotoluene.
(T)
K115
Heavy ends from the purification of
								  toluenediamine in the production of toluenediamine via hydrogenation of
								  dinitrotoluene.
(T)
K116
Organic condensate from the solvent recovery
								  column in the production of toluene diisocyanate via phosgenation of
								  toluenediamine.
(T)
K117
Wastewater from the reactor vent gas scrubber in
								  the production of ethylene dibromide via bromination of ethane.
(T)
K118
Spent adsorbent solids from purification of
								  ethylene dibromide in the production of ethylene dibromide via bromination of
								  ethane.
(T)
K136
Still bottoms from the purification of ethylene
								  dibromide in the production of ethylene dibromide via bromination of
								  ethane.
(T)
K149
Distillation bottoms from the production of
								  alpha- (or methyl-) chlorinated toluenes, ring-chlorinated toluenes, benzoyl
								  chlorides, and compounds with mixtures of these functional groups. This waste
								  does not include still bottoms from the distillation of benzyl chloride.
(T)
K150
Organic residuals, excluding spent carbon
								  adsorbent, from the spent chlorine gas and hydrochloric acid recovery processes
								  associated with the production of alpha- (or methyl-) chlorinated toluenes,
								  ring-chlorinated toluenes, ben-zoyl chlorides, and compounds with mixtures of
								  these functional groups.
(T)
K151
Wastewater treatment sludges, excluding
								  neutralization and biological sludges, generated during the treatment of
								  wastewaters from the production of alpha- (or methyl-) chlorinated toluenes,
								  ring-chlorinated toluenes, ben-zoyl chlorides, and compounds with mixtures of
								  these functional groups.
(T)
K156
Organic waste, including heavy ends, still
								  bottoms, light ends, spent solvents, filtrates, and decantates, from the
								  production of carbamates and carba-moyl oximes. This listing does not apply to
								  wastes generated from the manufacture of 3-iodo-2-propynyl
								  n-butylcarbamate.
(T)
K157
Wastewaters, including scrubber waters, condenser
								  waters, washwaters, and separation waters, from the production of carbamates
								  and carbamoyl oximes. This listing does not apply to wastes generated from the
								  manufacture of 3-iodo-2-propynyl n-butylcarbamate.
(T)
K158
Bag house dusts and filter or separation solids
								  from the production of carba-mates and carbamoyl oximes. This listing does not
								  apply to wastes generated from the manufacture of 3-iodo-2-propynyl
								  n-butylcarbamate.
(T)
K159
Organics from the treatment of thiocarbamate
								  wastes.
(T)
K161
Purification solids, including filtration,
								  evaporation, and centrifugation solids, bag house dust and floor sweepings from
								  the production of dithiocar-bamate acids and their salts. This listing does not
								  include K125 or K126.
(R, T)
K174
Wastewater treatment sludges from the production
								  of ethylene dichloride or vinyl chloride monomer, including sludges that result
								  from commingled ethylene dichloride or vinyl chloride monomer wastewater and
								  other waste-water, unless the sludges are disposed of in a hazardous waste or
								  non-hazardous waste landfill licensed or permitted by the state or federal
								  government; they are not otherwise placed on the land prior to final disposal;
								  and the generator maintains documentation demonstrating that the waste was
								  either disposed of in an on-site landfill or consigned to a transporter or
								  disposal facility that provided a written commitment to dispose of the waste in
								  an off-site landfill. Respondents in any action brought to enforce chs.
								  NR
								  660 to 670 shall, upon a showing by the government
								  that the respondent managed wastewater treatment sludges from the production of
								  vinyl chloride monomer or ethylene dichloride, demonstrate that they meet the
								  terms of the exclusion in the previous sentence. In doing so, they shall
								  provide appropriate documentation, such as contracts between the generator and
								  the landfill owner or operator, invoices documenting delivery of waste to
								  landfill, etc., that the terms of the exclusion were met.
(T)
K175
Wastewater treatment sludges from the production
								  of vinyl chloride monomer using mercuric chloride catalyst in an
								  acetylene-based process
(T)
K181
Nonwastewaters from the production of dyes or
								  pigments, including non-wastewaters commingled at the point of generation with
								  nonwastewaters from other processes, that, at the point of generation, contain
								  mass loadings of any of the constituents identified in sub. (3) that are equal
								  to or greater than the corresponding sub. (3) levels, as determined on a
								  calendar year basis. These wastes will not be hazardous if the nonwastewaters
								  are: (1) disposed in a solid waste landfill unit subject to the design criteria
								  in
								  40 CFR 258.40,
								  (2) disposed in a hazardous waste landfill unit subject to either s.
								  NR
								  664.0301 or 665.0301, (3) disposed in other solid
								  waste landfill units that meet the design criteria in
								  40 CFR 258.40, s.
								  NR
								  664.0301, or s.
								  NR
								  665.0301, or (4) treated in a combustion unit that is
								  licensed under s.
								  291.25,
								  Stats., or an on-site combustion unit that is permitted under the Clean Air
								  Act,
								  42 USC
								  7401 to
								  7671q or
								  ch. 285, Wis. Stats. For the purposes of this listing, dyes or pigments
								  production is defined in sub. (2) (a). Subsection (4) describes the process for
								  demonstrating that a facility's nonwastewaters are not K181. This listing does
								  not apply to wastes that are otherwise identified as hazardous under ss. NR
								  661.0021 to 661.0024 and ss. NR 661.0031 to 661.0033 at the point of
								  generation. Also, the listing does not apply to wastes generated before any
								  annual mass loading limit is met.
(T)
Inorganic chemicals:
K071
Brine purification muds from the mercury cell
								  process in chlorine production, where separately prepurified brine is not
								  used.
(T)
K073
Chlorinated hydrocarbon waste from the
								  purification step of the diaphragm cell process using graphite anodes in
								  chlorine production.
(T)
K106
Wastewater treatment sludge from the mercury cell
								  process in chlorine production.
(T)
K176
Baghouse filters from the production of antimony
								  oxide, including filters from the production of intermediates, such as antimony
								  metal or crude antimony oxide.
(E)
K177
Slag from the production of antimony oxide that
								  is speculatively accumulated or disposed, including slag from the production of
								  intermediates, such as antimony metal or crude antimony oxide.
(T)
K178
Residues from manufacturing and
								  manufacturing-site storage of ferric chloride from acids formed during the
								  production of titanium dioxide using the chloride-ilmenite process.
(T)
Pesticides:
K031
By-product salts generated in the production of
								  MSMA and cacodylic acid.
(T)
K032
Wastewater treatment sludge from the production
								  of chlordane.
(T)
K033
Wastewater and scrub water from the chlorination
								  of cyclopentadiene in the production of chlordane.
(T)
K034
Filter solids from the filtration of
								  hexachlorocyclopentadiene in the production of chlordane.
(T)
K035
Wastewater treatment sludges generated in the
								  production of creosote.
(T)
K036
Still bottoms from toluene reclamation
								  distillation in the production of disul-foton.
(T)
K037
Wastewater treatment sludges from the production
								  of disulfoton.
(T)
K038
Wastewater from the washing and stripping of
								  phorate production.
(T)
K039
Filter cake from the filtration of
								  diethylphosphorodithioic acid in the production of phorate.
(T)
K040
Wastewater treatment sludge from the production
								  of phorate.
(T)
K041
Wastewater treatment sludge from the production
								  of toxaphene.
(T)
K042
Heavy ends or distillation residues from the
								  distillation of tetrachlorobenzene in the production of 2,4,5-T.
(T)
K043
2,6-Dichlorophenol waste from the production of
								  2,4-D.
(T)
K097
Vacuum stripper discharge from the chlordane
								  chlorinator in the production of chlordane.
(T)
K098
Untreated process wastewater from the production
								  of toxaphene.
(T)
K099
Untreated wastewater from the production of
								  2,4-D.
(T)
K123
Process wastewater, including supernates,
								  filtrates, and washwaters, from the production of ethylenebisdithiocarbamic
								  acid and its salt.
(T)
K124
Reactor vent scrubber water from the production
								  of ethylenebisdithiocar-bamic acid and its salts.
(C, T)
K125
Filtration, evaporation, and centrifugation
								  solids from the production of ethylenebisdithiocarbamic acid and its
								  salts.
(T)
K126
Baghouse dust and floor sweepings in milling and
								  packaging operations from the production or formulation of
								  ethylenebisdithiocarbamic acid and its salts.
(T)
K131
Wastewater from the reactor and spent sulfuric
								  acid from the acid dryer from the production of methyl bromide.
(C, T)
K132
Spent absorbent and wastewater separator solids
								  from the production of methyl bromide.
(T)
Explosives:
K044
Wastewater treatment sludges from the
								  manufacturing and processing of explosives.
(R)
K045
Spent carbon from the treatment of wastewater
								  containing explosives.
(R)
K046
Wastewater treatment sludges from the
								  manufacturing, formulation and loading of lead-based initiating
								  compounds.
(T)
K047
Pink/red water from TNT operations.
(R)
Petroleum refining:
K048
Dissolved air flotation, DAF, float from the
								  petroleum refining industry.
(T)
K049
Slop oil emulsion solids from the petroleum
								  refining industry.
(T)
K050
Heat exchanger bundle cleaning sludge from the
								  petroleum refining industry.
(T)
K051
API separator sludge from the petroleum refining
								  industry.
(T)
K052
Leaded tank bottoms from the petroleum refining
								  industry.
(T)
K169
Crude oil storage tank sediment from petroleum
								  refining operations.
(T)
K170
Clarified slurry oil tank sediment or in-line
								  filter/separation solids from petroleum refining operations.
(T)
K171
Spent Hydrotreating catalyst from petroleum
								  refining operations, including guard beds used to desulfurize feeds to other
								  catalytic reactors. This listing does not include inert support media.
(I, T)
K172
Spent Hydrorefining catalyst from petroleum
								  refining operations, including guard beds used to desulfurize feeds to other
								  catalytic reactors. This listing does not include inert support media.
(I, T)
Iron and steel:
K061
Emission control dust/sludge from the primary
								  production of steel in electric furnaces.
(T)
K062
Spent pickle liquor generated by steel finishing
								  operations of facilities within the iron and steel industry, SIC Codes 331 and
								  332.
(C, T)
Primary aluminum:
K088
Spent potliners from primary aluminum
								  reduction.
(T)
Secondary lead:
K069
Emission control dust/sludge from secondary lead
								  smelting. This listing does not include sludge generated from secondary acid
								  scrubber systems.
(T)
K100
Waste leaching solution from acid leaching of
								  emission control dust/sludge from secondary lead smelting.
(T)
Veterinary pharmaceuticals:
K084
Wastewater treatment sludges generated during the
								  production of veterinary pharmaceuticals from arsenic or organo-arsenic
								  compounds.
(T)
K101
Distillation tar residues from the distillation
								  of aniline-based compounds in the production of veterinary pharmaceuticals from
								  arsenic or organo-arsenic compounds.
(T)
K102
Residue from the use of activated carbon for
								  decolorization in the production of veterinary pharmaceuticals from arsenic or
								  organo-arsenic compounds.
(T)
Ink formulation:
K086
Solvent washes and sludges, caustic washes and
								  sludges, or water washes and sludges from cleaning tubs and equipment used in
								  the formulation of ink from pigments, driers, soaps, and stabilizers containing
								  chromium and lead.
(T)
Coking:
K060
Ammonia still lime sludge from coking
								  operations.
(T)
K087
Decanter tank tar sludge from coking
								  operations.
(T)
K141
Process residues from the recovery of coal tar,
								  including collecting sump residues from the production of coke from coal or the
								  recovery of coke byproducts produced from coal. This listing does not include
								  K087, decanter tank tar sludges from coking operations.
(T)
K142
Tar storage tank residues from the production of
								  coke from coal or from the recovery of coke by-products produced from
								  coal.
(T)
K143
Process residues from the recovery of light oil,
								  including those generated in stills, decanters, and wash oil recovery units
								  from the recovery of coke byproducts produced from coal.
(T)
K144
Wastewater sump residues from light oil refining,
								  including intercepting or contamination sump sludges from the recovery of coke
								  by-products produced from coal.
(T)
K145
Residues from naphthalene collection and recovery
								  operations from the recovery of coke by-products produced from coal.
(T)
K147
Tar storage tank residues from coal tar
								  refining.
(T)
K148
Residues from coal tar distillation, including
								  still bottoms.
(T)
(2)
				  LISTING SPECIFIC DEFINITIONS. For the purposes of the K181 listing under sub.
				  (3), dyes or pigments production is defined to include manufacture of the
				  following product classes: dyes, pigments, or FDA certified colors that are
				  classified as azo, triarylmethane, perylene or anthraquinone classes. Azo
				  products include azo, monoazo, diazo, triazo, polyazo, azoic, benzidine, and
				  pyrazolone products. Triarylmethane products include both triarylmethane and
				  triphenylmethane products. Wastes that are not generated at a dyes or pigments
				  manufacturing site, such as wastes from the off-site use, formulation, and
				  packaging of dyes or pigments, are not included in the K181 listing.
(3) K181 LISTING LEVELS. Nonwastewaters
				  containing constituents in amounts equal to or exceeding the following levels
				  during any calendar year are subject to the K181 listing, unless the conditions
				  in the K181 listing are met.
Constituent
Chemical abstracts number
Mass levels (kg/yr)
Aniline
62-53-3
9,300
o-Anisidine
90-04-0
110
4-Chloroaniline
106-47-8
4,800
p-Cresidine
120-71-8
660
2,4-Dimethylaniline
95-68-1
100
1,2-Phenylenediamine
95-54-5
710
1,3-Phenylenediamine
108-45-2
1,200
(4)
				  PROCEDURES FOR DEMONSTRATING THAT DYES OR PIGMENT NONWASTEWATERS ARE NOT K181.
				  The procedures described in pars. (a) to (c) and (e) establish when
				  nonwastewaters from the production of dyes or pigments would not be hazardous.
				  These procedures apply to wastes that are not disposed in landfill units or
				  treated in combustion units as specified in sub. (1). If the nonwastewaters are
				  disposed in landfill units or treated in combustion units as described in sub.
				  (1), then the nonwastewaters are not hazardous. In order to demonstrate that it
				  is meeting the landfill disposal or combustion conditions contained in the K181
				  listing description, the generator shall maintain documentation as described in
				  par. (d).
(a)
Determination based on
				  no K181 constituents
. A generator that has knowledge, such as
				  knowledge of constituents in wastes based on prior sampling and analysis data
				  or information about raw materials used, production processes used, and
				  reaction and degradation products formed, that its wastes contain none of the
				  K181 constituents listed in sub. (3) can use its knowledge to determine that
				  its waste is not K181. The generator shall document the basis for all such
				  determinations on an annual basis and keep each annual documentation for 3
				  years.
(b)
Determination
				  for generated quantities of 1,000 metric tons a year or less for wastes that
				  contain K181 constituents
. If the total annual quantity of dyes or
				  pigment nonwastewaters generated is 1,000 metric tons or less, the generator
				  can use knowledge of the wastes, such as knowledge of constituents in wastes
				  based on prior analytical data or information about raw materials used,
				  production processes used, and reaction and degradation products formed, to
				  conclude that annual mass loadings for the K181 constituents are below the
				  listing levels of sub. (3). To make this determination, the generator shall do
				  all of the following:
1. Each year document
				  the basis for determining that the annual quantity of nonwastewaters expected
				  to be generated will be less than 1,000 metric tons.
2. Track the actual quantity of
				  nonwastewaters generated from January 1 through December 31 of each year. If,
				  at any time within the year, the actual waste quantity exceeds 1,000 metric
				  tons, the generator shall comply with the requirements under par. (c) for the
				  remainder of the year.
3. Keep a
				  running total of the K181 constituent mass loadings over the course of the
				  calendar year.
4. Keep all of the
				  following records on-site for the 3 most recent calendar years in which the
				  hazardous waste determinations are made:
a.
				  The quantity of dyes or pigment nonwastewaters generated.
b. The relevant process information
				  used.
c. The calculations performed
				  to determine annual total mass loadings for each K181 constituent in the
				  nonwastewaters during the year.
(c)
Determination for generated
				  quantities greater than 1,000 metric tons a year for wastes that contain K181
				  constituents.
If the total annual quantity of dyes or pigment
				  nonwastewaters generated is greater than 1,000 metric tons, the generator shall
				  perform all of the following steps in order to make a determination that its
				  waste is not K181:
1. Determine which K181
				  constituents listed in sub. (3) are reasonably expected to be present in the
				  wastes based on knowledge of the wastes, such as based on prior sampling and
				  analysis data or information about raw materials used, production processes
				  used, and reaction and degradation products formed.
2. If 1,2-phenylenediamine is present in the
				  wastes, the generator can use either knowledge or sampling and analysis
				  procedures to determine the level of this constituent in the wastes. For
				  determinations based on use of knowledge, the generator shall comply with the
				  procedures for using knowledge described in par. (b) and keep the records
				  described in par. (b) 4. For determinations based on sampling and analysis, the
				  generator shall comply with all of the sampling and analysis and recordkeeping
				  requirements in subds. 3. to 11.
3.
				  Develop a waste sampling and analysis plan or modify an existing plan to
				  collect and analyze representative waste samples for the K181 constituents
				  reasonably expected to be present in the wastes. At a minimum, the plan shall
				  include all of the following:
a. A discussion
				  of the number of samples needed to characterize the wastes fully.
b. The planned sample collection method to
				  obtain representative waste samples.
c. A discussion of how the sampling plan
				  accounts for potential temporal and spatial variability of the
				  wastes.
d. A detailed description
				  of the test methods to be used, including sample preparation, clean up, if
				  necessary, and determinative methods.
4. Collect and analyze samples in accordance
				  with the waste sampling and analysis plan.
a.
				  The sampling and analysis shall be unbiased, precise, and representative of the
				  wastes.
b. The analytical
				  measurements shall be sufficiently sensitive, accurate and precise to support
				  any claim that the constituent mass loadings are below the listing levels of
				  sub. (3).
5. Record the
				  analytical results.
6. Record the
				  waste quantity represented by the sampling and analysis results.
7. Calculate constituent-specific mass
				  loadings, product of concentrations and waste quantity.
8. Keep a running total of the K181
				  constituent mass loadings over the course of the calendar year.
9. Determine whether the mass of any of the
				  K181 constituents listed in sub. (3) generated between January 1 and December
				  31 of any year is below the K181 listing levels.
10. Keep all of the following records on site
				  for the 3 most recent calendar years in which the hazardous waste
				  determinations are made:
a. The sampling and
				  analysis plan.
b. The sampling and
				  analysis results, including quality assurance/quality control data.
c. The quantity of dyes or pigment
				  nonwastewaters generated.
d. The
				  calculations performed to determine annual mass loadings.
11. Nonhazardous waste determinations shall
				  be conducted annually to verify that the wastes remain nonhazardous.
a. The annual testing requirements are
				  suspended after 3 consecutive successful annual demonstrations that the wastes
				  are nonhazardous. The generator can then use knowledge of the wastes to support
				  subsequent annual determinations.
b. The annual testing requirements are
				  reinstated if the manufacturing or waste treatment processes generating the
				  wastes are significantly altered, resulting in an increase of the potential for
				  the wastes to exceed the listing levels.
c. If the annual testing requirements are
				  suspended, the generator shall keep records of the process knowledge
				  information used to support a nonhazardous determination. If testing is
				  reinstated, a description of the process change shall be retained.
(d)
Recordkeeping for the landfill disposal and combustion
				  exemptions.
For the purposes of meeting the landfill disposal and
				  combustion condition set out in the K181 listing description, the generator
				  shall maintain on site for 3 years documentation demonstrating that each
				  shipment of waste was received by a landfill unit that is subject to or meets
				  the landfill design standards set out in the listing description, or was
				  treated in combustion units as specified in the listing description.
(e)
Waste holding and
				  handling
. During the interim period, from the point of generation to
				  completion of the hazardous waste determination, the generator is responsible
				  for storing the wastes appropriately. If the wastes are determined to be
				  hazardous and the generator has not complied with the hazardous waste
				  requirements during the interim period, the generator may be subject to an
				  enforcement action for improper management.