ILLINOIS POLLUTION CONTROL BOARD
    January 9,
    1992
    IN THE
    MATTER
    OF:
    )
    )
    RCRA WOOD PRESERVING RULES
    )
    R91-26
    COMPLIANCE DATES
    )
    (Identical in
    Substance
    )
    Rules)
    ADOPTED RULES.
    FINAL ORDER.
    OPINION
    AND
    ORDER OF THE
    BOARD
    (by J. Anderson):
    On October 24,
    1991, the Board proposed to extend the
    compliance dates for certain wood preserving wastes in listings
    F034 and F035
    in 35 Ill.
    Adm. Code 721.131.
    The Proposal
    appeared on November 8,
    1991, at 15 Ill.
    Reg. 15910.
    The Board
    has received public comment only from the Administrative Code
    Division.
    The Board will therefore adopt the rules substantially
    as proposed.
    On August
    8,
    1991, the Board entered a final Opinion and
    Order in R91-l.
    Among other things, the Board adopted new
    regulations regulating wood preservers.
    These rules were derived
    from USEPA regulations adopted at 55 Fed. Reg.
    50450,
    December
    6,
    1990.
    As was discussed on p. 11—14 of the R91—l Opinion, USEPA
    administratively stayed the wood preserving rules at
    56
    Fed. Reg.
    27332, June 13,
    1991.
    The Board addressed the stay in R9l-1,
    even though it was outside the normal batch period for the
    Docket.
    As was discussed in the R91—1 Opinion, commenters asked the
    Board to delay adoption of the wood preserving rules until after
    the USEPA administrative stay expired.
    Instead, the Board
    determined to adopt the USEPA wood preserving rules, along with
    USEPA’s language staying the rules; however, the stay applied
    only to those who made prior date-certain filings of required
    information.
    To qualify for the USEPA administrative stay,
    wood
    preservers had to notify USEPA by August
    6,
    1991, that they
    intended to upgrade drip pads by placing an impermeable coating
    on the surface.
    Wood preservers also have to notify USEPA by
    November 6,
    1991, with a plan and financial commitments for the
    upgrading,
    which upgrading must then be completed by February 6,
    1992.
    This Docket concerns only the non-HSWA portions of the wood
    preserving rules.
    Non-HSWA requirements are not effective in
    authorized states, such as Illinois, until they are adopted by
    the states.
    As was discussed on
    p.
    13 of the R91-l Opinion,
    USEPA and wood preservers subject only to the non-HSWA portions
    of the USEPA rules may have been operating on the assumption that
    Illinois would not adopt the USEPA rules because of the USEPA
    129—235

    2
    stay and anticipated USEPA modification of their rules.
    However,
    the Environmental Protection Act
    (see Sections 7.2(a)
    and
    22.4(a)) expects the Board to adopt these rules,
    subject to the
    stay.
    In that the Board’s action might have caused confusion,
    the Board had extended the initial notification date,
    from August
    6 to November 6,
    1991, to qualify for the stay from the Board
    rules.
    Since the R91-1 rules were filed however, Board staff has
    received several calls from wood preservers claiming that the
    coating’operation required outdoor temperatures in excess of 70
    degrees Fahrenheit.
    It is therefore physically impossible to
    comply with the conditions of the stay by preparing a plan and
    carrying out the coating operation before February 6, at least in
    Illinois.
    As was discussed above, and in R91—l, USEPA has stayed these
    requirements and may not expect the States to adopt them all
    until after the federal rules have been modified in a subsequent
    rulemaking.
    In any event,
    40 CFR 271.21(e) would not require
    State action on the non-HSWA components until July 1,
    1992.
    The
    Board is therefore now extending the upgrading compliance date to
    July 1,
    1992.
    The Board will also extend the date for the plan
    and financial commitments to February 6,
    1992, to give wood
    preservers time to file the plan and financial commitments after
    the Board’s rules become effective.
    Our instant action is a correction to R91-1, as contemplated
    in Section 7.2(b) of the Act.
    In this Docket the Board
    is doing
    that which it would have done in R91-1, had it been fully advised
    of the facts.
    The Board will therefore amend the “stay” languagG in the
    Board Notes following listings F034 and F035 in Section 721.131,
    as is set forth below.
    It apparently is not necessary to amend
    the operative language in Section 724.673 and 725.543.
    The stay
    of F032
    is HSWA—driven, and apparently cannot be extended.
    The Board directs that the text of the adopted rules be
    published in the Illinois Register as soon as possible
    ORDER
    TITLE 35:
    ENVIRONMENTAL PROTECTION
    SUBTITLE G:
    WASTE DISPOSAL
    CHAPTER
    I:
    POLLUTION CONTROL BOARD
    SUBCHAPTER
    C:
    HAZARDOUS WASTE OPERATING REQUIREMENTS
    PART 721
    IDENTIFICATION
    AND
    LISTING OF HAZARDOUS WASTE
    SUBPART A:
    GENERAL PROVISIONS
    129—236

    3
    Section
    721.101
    721.102
    721.103
    721.104
    721.105
    721.106
    721.107
    721.108
    Purpose and Scope
    Definition of Solid Waste
    Definition of Hazardous Waste
    Exclusions
    Special Requirements for Hazardous Waste Generated by
    Small Quantity Generators
    Requirements for Recyclable Materials
    Residues of Hazardous Waste in Empty Containers
    PCB Wastes Regulated under TSCA
    SUBPART B:
    CRITERIA FOR IDENTIFYING THE CHARACTERISTICS
    OF HAZARDOUS WASTE
    AND
    FOR LISTING HAZARDOUS WASTES
    Section
    721.110
    Criteria for Identifying the Characteristics of
    Hazardous Waste
    721.111
    Criteria for Listing Hazardous Waste
    SUBPART C:
    CHARACTERISTICS OF HAZARDOUS WASTE
    General
    Characteristic of Ignitability
    Characteristic of Corrosivity
    Characteristic of Reactivity
    General
    Hazardous Wastes From Nonspecific Sources
    Hazardous Waste from Specific Sources
    Discarded Commercial Chemical Products,
    Off-
    Specification Species, Container Residues and Spill
    Residues Thereof
    721.135
    Wood Preserving Wastes
    721.Appendix
    721.Appendix
    ~~App
    endix
    Table A
    Table B
    Table C
    721.Appendix
    721.Appendix
    721.Appendix
    Table A
    Table B
    Table C
    A Representative Sampling Methods
    B Method 1311 Toxicity Characteristic Leaching
    Procedure (TCLP)
    C Chemical Analysis Test Methods
    Analytical Characteristics of Organic Chemicals
    (Repealed)
    Analytical Characteristics of Inorganic Species
    (Repealed)
    Sample Preparation/Sample Introduction Techniques
    (Repealed)
    G Basis for Listing Hazardous Wastes
    H Hazardous Constituents
    I Wastes Excluded
    Wastes Excluded
    Wastes Excluded
    Wastes Excluded
    under Section 720.120 and 720.122
    from Non—Specific Sources
    from Specific Sources
    From Commercial Chemical Products,
    Section
    721.120
    721.121
    721.122
    721.123
    721.124
    Section
    721.130
    721.131
    721.132
    721. 133
    Toxicity Characteristic
    SUBPART D:
    LISTS OF HAZARDOUS WASTE
    129—237

    4
    Off—Specification Species, Container Residues, and
    Soil Residues Thereof
    721.Appendix J Method of Analysis for Chlorinated Dibenzo-p-
    Dioxins and Dibenzofurans
    721.Appendix
    Z Table to Section 721.102
    AUTHORITY:
    Implementing Section 22.4 and authorized by Section
    27 of the Environmental Protection Act
    (Ill. Rev.
    Stat.
    1989,
    ch.
    111½, pars.
    1022.4 and 1027).
    SOURCE:
    Adopted in R81—22,
    43 PCB 427, at
    5 Ill.
    Reg.
    9781,
    effective as noted in 35 Ill. Adm. Code 700.106; amended and
    codified in R8l—22,
    45 PCB 317,
    at
    6 Ill. Reg. 4828,
    effective as
    noted in 35 Ill. Adm. Code 700.106; amended in R82—18,
    51 PCB 31,
    at
    7 Ill. Reg.
    2518,
    effective February 22,
    1983;
    amended in R82-
    19,
    53 PCB 131,
    at 7
    Ill.
    Reg.
    13999, effective October 12,
    1983;
    amended in R84—34,
    61 PCB 247, at 8 Ill. Reg.
    24562,
    effective
    December 11,
    1984; amended in R84—9, at
    9 Ill. Reg.
    11834,
    effective July 24,
    1985; amended in R85—22 at 10
    Ill. Reg.
    998,
    effective January
    2,
    1986; amended in R85—2 at 10
    Ill. .Reg~8112,
    effective May 2,
    1986; amended in R86—1 at 10 Ill. Reg.
    14002,
    effective August 12,
    1986; amended in R86—19 at 10 Ill.
    Reg.
    20647,
    effective December 2, 1986; amended in R86—28 at 11 Ill.
    Reg.
    6035, effective March 24,
    1987; amended in R86-46 at 11
    Ill.
    Reg.
    13466, effective August 4,
    1987; amended in R87—32 at
    11
    Ill. Reg.
    16698, effective September 30,
    1987; amended in R87-5
    at 11 Ill. Reg.
    19303, effective November 12,
    1987;
    amended in
    R87—26 at 12 Ill.
    Reg.
    2456, effective January
    15,
    1988; amended
    in R87—30 at 12 Ill. Reg.
    12070, effective July 12,
    1988; amended
    in R87—39 at 12 Ill. Reg.
    13006, effective July 29,
    1988; amended
    in R88-16 at 13 Ill. Reg.
    382, effective December 27,
    1988;
    amended in R89-1 at 13 Ill. Reg.
    18300, effective November 13,
    1989; amended in R90—2 at 14 Ill.
    Reg.
    14401, effective August
    22,
    1990; amended in R90-10 at 14 Ill.
    Reg.
    16472, effective
    September 25,
    1990; amended in R90-l7 at
    15 Ill.
    Reg.
    7950,
    effective May 9,
    1991;
    amended in R90-11 at
    15 Ill.
    Reg. 9332,
    effective June 17,
    1991; amended in R91—1 at 15 Ill. Reg.
    14473,
    effective September 30,
    1991;
    amended in R91-12 at 16 Ill. Reg.
    effective
    ;
    amended in R91—26 at 16 Ill.
    Reg.
    effective
    SUBPART D:
    LISTS OF HAZARDOUS WASTE
    Section 721.131
    Hazardous Wastes From Nonspecific Sources
    a)
    The following solid wastes are listed hazardous wastes
    from non—specific sources unless they are excluded
    under 35 Ill.
    Adin.
    Code 720.120 and 720.122 and listed
    in Appendix
    I.
    EPA
    Industry and Hazardous Waste
    Haz-
    Hazardous
    ard
    129—238

    5
    Waste No.
    Code
    FOOl
    The following spent halogenated
    (T)
    solvents used in degreasing:
    tetra—
    chloroethylene, trichloroethylene,
    methylene chloride,
    1,1,1-trichloro-
    ethane,
    carbon tetrachloride and
    chlorinated fluorocarbons; all spent
    solvent mixtures and blends used in
    degreasing containing,
    before use,
    a
    total of ten percent or more
    (by
    volume)
    of one or more of the above
    halogenated solvents or those solvents
    listed in F002,
    F004 or F005; and still
    bottoms from the recovery of these
    spent solvents and spent solvent
    mixtures.
    F002
    The following spent halogenated
    (T)
    solvents:
    tetrachioroethylene,
    methylene chloride, trichioroethylene,
    1,1,1—trichloroethane,
    chlorobenzene,
    1,1,2—trichloro-1,2, 2—trifluoroethane,
    orthodichlorobenzene, trichioro—
    fluoromethane and 1,1,2—trichloro—
    ethane; all spent solvent mixtures and
    blends containing,
    before use,
    a total
    of ten percent or more
    (by volume)
    of
    one or more of the above halogenated
    solvents or those solvents listed in
    FOOl,
    F004 or F005; and still bottoms
    from the recovery of these spent
    solvents and spent solvent mixtures.
    F003
    The following spent non-halogenated
    (I)
    solvents:
    xylene, acetone, ethyl
    acetate,
    ethyl benzene,
    ethyl ether,
    methyl isobutyl ketone, n-butyl
    alcohol, cyclohexanone and methanol;
    all spent solvent mixtures and blends
    containing,
    before use, only the above
    spent non—halogenated solvents; and all
    spent solvent mixtures and blends
    containing,
    before use, one or more of
    the above non—halogenated solvents and
    a total of ten percent or more
    (by
    volume) of one or more of those
    solvents listed in FOOl,
    F002,
    F004 or
    F005;
    and still bottoms from the
    recovery of these spent solvents and
    spent solvent mixtures.
    129—239

    6
    FOO4
    The following spent non-halogenated
    (T)
    solvents:
    cresols and cresylic acid
    and nitrobenzene; all spent solvent
    mixtures and blends containing,
    before
    use,
    a total of ten percent or more
    (by
    volume)
    of one or more of the above
    non—halogenated solvents or those
    solvents listed in FOOl,
    FOO2 or FOOS;
    and still bottoms from the recovery of
    these spent solvents and spent solvent
    mixtures.
    FOO5
    The following spent non-halogenated
    (I,
    solvents:
    toluene, methyl ethyl
    T)
    ketone,
    carbon disulfide,
    isobutanol,
    pyridine, benzene, 2-ethoxyethanol and
    2—nitropropane;
    all spent solvent
    mixtures and blends,
    containing, before
    use, a total of ten percent or more
    (by
    volume)
    of one or more of the above
    non—halogenated solvents or those
    solvents listed in FOOl,
    FOO2 or FOO4;
    and still bottoms from the recovery of
    these spent solvents and spent solvent
    mixtures.
    FOO6
    Wastewater treatment sludges from
    (T)
    electroplating operations except from
    the following processes:
    (1)
    sulfuric
    acid anodizing of aluminum;
    (2) tin
    plating on carbon steel;
    (3)
    zinc
    plating
    (segregated basis)
    on carbon
    steel;
    (4) aluminum or zinc—aluminum
    plating on carbon steel;
    (5)
    cleaning/stripping associated with tin,
    zinc and aluminum plating on carbon
    steel; and
    (6) chemical etching and
    milling of aluminum.
    F019
    See Below
    FOO7
    Spent cyanide plating bath solutions
    (R,
    from electroplating operations.
    T)
    FOO8
    Plating bath residues from the bottom
    (R,
    of plating baths from electroplating
    T)
    operations where cyanides are used in
    the process.
    F009
    Spent stripping and cleaning bath
    (R,
    solutions from electroplating
    T)
    operations where cyanides are used in
    129—240

    7
    the process.
    FOlO
    Quenching bath residues from oil baths
    (R,
    from metal heat treating operations
    T)
    where cyanides are used in the process.
    FOil
    Spent cyanide solutions from salt bath
    (R,
    pot cleaning from metal heat treating
    T)
    operations.
    FO12
    Quenching wastewater treatment sludges
    (T)
    from metal heat treating operations
    where cyanides are used in the process.
    FO19
    Wastewater treatment sludges from the
    (T)
    chemical conversion coating of aluminum
    except from zirconium phosphating in
    aluminum can washing when such
    phosphating is an exclusive conversion
    coating process.
    FO2O
    Wastes
    (except wastewater and spent
    (H)
    carbon from hydrogen chloride
    purification) from the production or
    manufacturing use
    (as a reactant,
    chemical intermediate or component in a
    formulating process)
    of tn— or tetra—
    chlorophenol,
    or of intermediates used
    to produce their pesticide derivatives.
    (This listing does not include wastes
    from the production of hexachlorophene
    from highly purified 2,4,5—trichloro-
    phenol.)
    F02l
    Wastes
    (except wastewater and spent
    (H)
    carbon from hydrogen chloride
    purification) from the production or
    manufacturing use
    (as a reactant,
    chemical intermediate or component in a
    formulating process)
    of pentachloro—
    phenol, or of intermediates used to
    produce its derivatives.
    FO22
    Wastes
    (except wastewater and spent
    (H)
    carbon from hydrogen chloride
    purification) from the manufacturing
    use
    (as a reactant, chemical
    intermediate or component in a
    formulating process)
    of tetra—, penta-
    or hexachlorobenzenes under alkaline
    conditions.
    129—24 1

    8
    F023
    Wastes (except wastewater and spent
    (H)
    carbon from hydrogen chloride
    purification)
    from the production of
    materials on equipment previously used
    for the production or manufacturing use
    (as a reactant, chemical intermediate
    or component in a formulating process)
    of tn- and tetrachlorophenols.
    (This
    listing does not include wastes from
    equipment used only for the production
    or use of hexachlorophene from highly
    purified 2,4,5- trichiorophenol.
    F024
    Process wastes including but not
    (T)
    limited to, distillation residues,
    heavy ends,
    tars, and reactor cleanout
    wastes, from the production of certain
    chlorinated aliphatic hydrocarbons by
    free radical catalyzed processes.
    These chlorinated aliphatic
    hydrocarbons are those having carbon
    chain lengths ranging from one to and
    including five, with varying amounts
    and positions of chlorine substitution.
    (This listing does not include
    wastewaters, wastewater treatment
    sludges,
    spent catalysts and wastes
    listed in this Section or Section
    721.132.)
    FO25
    Condensed light ends,
    spent filters and
    (T)
    filter aids,
    and spent desicant wastes
    from the production of certain
    chlorinated aliphatic hydrocarbons by
    free radical catalyzed processes.
    These chlorinated aliphatic
    hydrocarbons are those having carbon
    chain lengths ranging from one to and
    including five,
    with. varying amounts
    and positions of chlorine substitution.
    F026
    Wastes
    (except wastewater and spent
    (H)
    carbon from hydrogen chloride
    purification)
    from the production of
    materials on equipment previously used
    for the manufacturing use
    (as a
    reactant, chemical intermediate or
    component in a formulating process)
    of
    tetra—, penta— or hexachlorobenzene
    under alkaline conditions.
    F027
    Discarded unused formulations
    (H)
    129—242

    9
    containing tn-, tetra- or pentachloro-
    phenol or discarded unused formulations
    containing compounds derived from these
    chlorophenols.
    (This listing does not
    include formulations containing hexa—
    chlorophene synthesized from
    prepurified 2,4,5-trichlorophenol as
    the sole component).
    FO28
    Residues resulting from the
    (T)
    incineration or thermal treatment of
    soil contaminated with hazardous waste
    numbers F020,
    FO21,
    F022,
    FO23,
    F026
    and F027.
    F032
    Wastewaters, process residuals,
    (T)
    preservative drippage and spent
    formulations from wood preserving
    processes generated at plants that
    currently use or have previously used
    chlorophenolic formulations
    (except
    potentially cross—contaminated wastes
    that have had the F032 waste code
    deleted in accordance with Section
    721.135 and where the generator does
    not resume or initiate use of chloro—
    phenolic formulations).
    This listing
    does not include KOO1 bottom sediment
    sludge from the treatment of wastewater
    from wood preserving processes that use
    creosote or pentachlorophenol.
    BOARD NOTE:
    The listing of wastewaters
    that have not come into contact with
    process contaminants is stayed
    administratively.
    The listing for
    plants that have previously used
    chlorophenolic formulations is
    administratively stayed whenever these
    wastes are covered by the F034 or F035
    listings.
    These stays will remain in
    effect until further administrative
    action is taken.
    Furthermore, the FO32
    listing is administratively stayed with
    respect to the process area receiving
    drippage of these wastes provided
    persons desiring to continue operating
    notify USEPA by August
    6,
    1991, of
    their intent to upgrade or install drip
    pads, and by November 6,
    1991, provide
    evidence to USEPA that they have
    adequate financing to pay for drip pad
    129—243

    10
    upgrades or installation,
    as provided
    in the administrative stay.
    The stay
    of listings will remain in effect until
    February 6,
    1992,
    for existing drip
    pads,
    and until May 6, 1992,
    for new
    drip pads.
    F034
    Wastewaters, process residuals,
    (T)
    preservative dnippage and spent
    formulations from wood preserving
    processes generated at plants that use
    creosote formulations.
    This listing
    does not include KOO1 bottom sediment
    sludge from the treatment of wastewater
    from wood preserving processes that use
    creosote or pentachlorophenol.
    BOARD NOTE:
    The listing of wastewaters
    that have not come into contact with
    process contaminants
    is stayed
    administratively.
    These stays will
    remain in effect until further
    administrative action is taken.
    Furthermore, the F034 and FO35 listings
    are administratively stayed with
    respect to the process area receiving
    dnippage of these wastes provided that,
    by November
    6,
    l99lFebruary 6,
    1992,
    persons desiring to continue operating
    notify the Agency of their intent to
    upgrade or install drip pads,
    and
    provide evidence to the Agency that
    they have adequate financing to pay for
    drip pad upgrades or installation, as
    provided in the administrative stay.
    The stay of listings will remain in
    effect until February
    6,
    1992,
    for
    cxi~tingdrip pad3,
    and until May
    6,
    1992,
    for new drip pad3July 1,
    1992.
    F035
    Wastewaters, process residuals,
    (T)
    preservative drippage and spent
    formulations from wood preserving
    processes generated at plants that use
    inorganic preservatives containing
    arsenic or chromium.
    This listing does
    not include KOOl bottom sediment sludge
    from the treatment of wastewater from
    wood preserving processes that use
    creosote or pentachlorophenol.
    BOARD NOTE:
    The listing of wastewaters
    129—244

    11
    that have not come into contact with
    process contaminants
    is stayed
    administratively.
    These stays will
    remain in effect until further
    administrative action is taken.
    Furthermore, the F034 and F035 listings
    are administratively stayed with
    respect to the process area receiving
    drippage of these wastes provided that,
    by November
    6, l99lFebruary 6,
    1992,
    persons desiring to continue operating
    notify the Agency of their intent to
    upgrade or install drip pads,
    and
    provide evidence to the Agency that
    they have adequate financing to pay for
    drip pad upgrades or installation,
    as
    provided in the administrative stay.
    The stay of listings will remain in
    effect until February
    6,
    1992,
    for
    existing drip pads,
    and until May
    6,
    1992, for new drip padoJuly 1,
    1992.
    F037
    Petroleum refinery primary oil/water!
    (T
    solids separation sludge
    --
    Any sludge
    generated from the gravitational
    separation of oil/water/solids during
    the storage or treatment of process
    wastewaters and oily cooling
    wastewaters from petroleum refineries.
    Such sludges include, but are not
    limited to, those generated in:
    oil/
    water/solids separators; tanks and
    impoundments; ditches and other
    conveyances; sumps;
    and stormwater
    units receiving dry weather flow.
    Sludges generated in stormwater units
    that do not receive dry weather flow,
    sludges generated in aggressive
    biological treatment units as defined
    in subsection
    (b) (2)
    (including sludges
    generated in one or more additional
    units after wastewaters have been
    treated in aggressive biological
    treatment units) and KO51 wastes are
    not included in this listing.
    F038
    Petroleum refinery secondary
    (T)
    (emulsified)
    oil/water/solids
    separation sludge
    —-
    Any sludge or
    float generated from the physical or
    chemical separation of oil/water/solids
    in process wastewaters and oily cooling
    129—245

    12
    wastewaters from petroleum refineries.
    Such wastes include, but are not
    limited to, all sludges and floats
    generated in:
    induced air floatation
    (IAF)
    units, tanks and impoundments,
    and all sludges generated in DAF units.
    Sludges generated in stormwater units
    that do not receive dry weather flow,
    sludges generated in aggressive
    biological treatment units as defined
    in subsection
    (b) (2)
    (including sludges
    generated in one or more additional
    units after wastewaters have been
    treated in aggressive biological
    treatment units),
    F037, K048 and K051
    wastes are not included in this
    listing.
    F039
    Leachate resulting from the treatment,
    (T)
    storage or disposal of wastes
    classified by more than one waste code
    under Subpart
    D, or from a mixture of
    wastes classified under Subparts C and
    D.
    (Leachate resulting from the
    management of one or more of the
    following USEPA hazardous wastes and no
    other hazardous wastes retains its
    hazardous waste code(s):
    F020,
    FO21,
    F022,
    F023, FO26,
    F027 or FO28.)
    BOARD NOTE:
    The primary hazardous properties of these
    materials have been indicated by the letters T
    (Toxicity), R (Reactivity),
    I
    (Ignitability),
    and C
    (Corrosivity).
    The letter H indicates Acute Hazardous
    Waste.
    b)
    Listing specific definitions.
    1)
    For the purpose of the F037 and FO38 listings,
    oil/water/solids is defined as oil or water or
    solids.
    2)
    For the purposes of the F037 and FO38 listings:
    A)
    Aggressive biological treatment units are
    defined as units which employ one of the
    following four treatment methods:
    activated
    sludge; trickling filter; rotating biological
    contactor for the continuous accelerated
    biological oxidation of wastewaters; or,
    high-rate aeration.
    High—rate aeration
    is a
    system of surface impoundments or tanks,
    in
    129—246

    13
    which intense mechanical aeration
    is used to
    completely mix the wastes, enhance biological
    activity,
    and:
    i)
    The units employ a minimum of
    6
    horsepower per million gallons of
    treatment volume; and either
    ii)
    The hydraulic retention time of the unit
    is no longer than 5 days; or
    iii)
    The hydraulic retention time is no
    longer than 30 days and the unit does
    not generate a sludge that is
    a
    hazardous waste by the toxicity
    characteristic.
    B)
    Generators and treatment, storage or disposal
    (TSD)
    facilities have the burden of proving
    that their sludges are exempt from listing as
    F037 or FO38 wastes under this definition.
    Generators and TSD facilities shall maintain,
    in their operating or other on site records,
    documents and data sufficient to prove that:
    1)
    The unit is an aggressive biological
    treatment unit as defined in this
    subsection; and
    ii)
    The sludges sought to be exempted from
    F037 or F038 were actually generated in
    the aggressive biological treatment
    unit.
    3)
    Time of generation.
    For the purposes of:
    A)
    The FO37 listing, sludges are considered to
    be generated at the moment of deposition in
    the unit, where deposition is defined as at
    least a temporary cessation of lateral
    particle movement.
    B)
    The F038
    listing:
    i)
    Sludges are considered to be generated
    at the moment of deposition in the unit,
    where deposition is defined as at least
    a temporary cessation of lateral
    particle movement; and
    ii)
    Floats are considered to be generated at
    the moment they are formed in the top of
    129—247

    14
    the unit.
    (Source:
    Amended at 16
    Ill.
    Req.
    ,
    effective
    )
    IT IS SO ORDERED.
    I, Dorothy M. Gunn, Clerk of the Illinois Pollution Control
    Board, do hereby certif
    that the a
    e Opinion and Order was
    adopted ,on the
    -~
    day of
    ______________,
    1992. by a
    vote of
    ‘-~~°
    //
    ~?~z~ML
    ,~I
    Dorothy M. ~nn,
    Clerk
    Illinois P~’lutionControl Board
    129—248

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