ILLINOIS POLLUTION CONTROL BOARD
    January
    21, 1982
    REYNOLDS METALS COMPANY,
    Petitioner,
    v.
    )
    PCB 79—235
    ILLINOIS ENVIRONMENTAL PROTECTION AGENCY,
    Respondent.
    CLIFTON A. LAKE, ROOKS, PITTS, FULLAGAR AND POUST, APPEARED ON
    BEHALF OF PETITIONER.
    BARBARA A. CHASNOFF, ASSISTANT ATTORNEY GENERAL, APPEARED ON
    BEHALF OF RESPONDENT.
    OPINION AND ORDER OF THE BOARD
    (by
    I.
    Goodman):
    This matter is before the Board upon the petition of
    Reynolds Metals Company
    (Reynolds)
    for review of NPDES Permit
    No. 1L0001341 issued by the Illinois Environmental Protection
    Agency (Agency) on October
    12,
    1979.
    A hearing was held on
    this matter on Monday, June
    3,
    1981
    at which the parties herein
    presented a Stipulation of Fact
    (Stipulation).
    The Board has
    received no public comment in this matter.
    On September
    3,
    1981 the Agency filed its Brief and attached
    thereto a Motion for Leave to supplement the record.
    The supple—
    rnent consists of Reynolds’ permit application.
    Reynolds did not
    object to the Motion and has referred to the document
    in its
    Briefs.
    The Board will, therefore,
    grant the Agency’s Motion
    and accepts the permit application as part of the record herein.
    According to the Stipulation,
    Reynolds owns and operates
    a facility for the fabrication of aluminum metal and aluminum
    alloys located in McCook,
    Illinois.
    In connection with the opera-
    tion of this facility, Reynolds generates,
    treats as necessary,
    and discharges waste waters to the Summit—Lyons ditch, which is
    tributary to the Chicago Sanitary and Ship Canal.
    Waste water
    is discharged through two outfalls, one of which
    is the treated
    waste water discharge from Reynolds’
    main waste water treatment
    plant and the other, a combined sewer overflow which, when it
    overflows, discharges a combination of untreated waste waters
    and storm water runoff.
    Reynolds’ original NPDES permit was issued by the United
    States Environmental Protection Agency
    (USEPA) on June
    9,
    1976.
    45—99

    2
    October
    12,
    1979 the Agency reissued to Reynolds a NPDES permit
    which differed in certain significant respects from the one pre-
    viously issued by USEPA.
    Although the parties have resolved
    most of their differences with respect to the renewed permit,
    the conditions
    for the overflow outfall remain to be settled.
    The
    Reynolds
    facility
    is
    designed
    in
    such
    a
    manner
    that
    during
    a
    precipitation
    event
    sufficient
    to
    cause
    a
    combined
    sewer flow beyond the hydraulic capacity of the main waste
    water treatment facility (1200 gpm),
    a pumping station with
    a
    capacity of 15,000 gpm pumps the effluent into storage lagoons
    with
    a total capacity of
    6 million gallons
    of
    waste water,
    The
    storage
    lagoons
    are
    subsequently
    pumped
    down
    through
    the
    main
    waste
    water
    treatment
    plant
    utilizing
    its
    excess
    dry—weather
    capacity.
    As
    it is now constituted, Reynolds combined sewer
    overflow meets the requirements of Paragraphs
    1,
    2 and
    3 of
    Rule 602(c)
    of
    the
    Board’s Rules and Regulations; Chapter 3~
    Water Pollution (Water Rules).
    The
    original
    NPDES
    permit,
    as
    issued
    by
    USEPA,
    permitted
    direct discharge under excess flow conditions
    in order to avoid
    flooding out the main waste water treatment plant since
    it
    im-
    posed no express effluent limitation on that discharge.
    It did,
    however,
    require the storage lagoons be emptied as quickly as
    possible
    in order to provide retention capacity for subsequent
    rainfalls.
    The federal NPDES permit was certified by the Agency
    under Section
    401(d) of the Clean Water Act when it was issued.
    However,
    in
    reissuing
    Reynolds’
    NPDES
    permit,
    the
    Agency
    has
    im-
    posed
    additional
    express requiret~entsthat effluent discharges
    froir~ the combined waste water outfall comply with the effluent
    limitations
    for
    pH and oils,
    fats, and grease contained
    in Rule
    408(a)
    of
    the
    Water
    Rules.
    The
    issue
    is, therefore, whether as
    a matter
    of
    law
    the
    Agency
    may
    impose
    Rule
    408(a)
    Effluent Limitations on overflow
    discharges in the NPDES permit where applicants have complied
    with
    the
    requirements
    of Rule 602(c).
    It is the Agency’s posi-
    tion that
    it
    is
    within
    its
    discretion
    to
    impose
    Rule
    408(a)
    Ef-
    fluent
    Limitations
    on
    discharges notwithstanding the provisions
    of Rule 602(c),
    Reynolds,
    of
    course,
    argues
    that
    Rule
    408(a)
    limitations
    are
    inapplicable
    when
    the
    requirements
    of
    Rule
    602(c)
    are
    met.
    The Stipulation presents the foregoing as the sole legal
    issue
    in question
    in
    this matter and states that there exists no
    factual dispute
    in connection with the case.
    Notwithstanding the parties’
    attempt to reduce this case to
    one legal
    issue, the Board perceives three issues that it must
    address.
    These issues are:
    I)
    whether combined sewer systems
    in compliance with Rule 602(c) performance criteria are still
    subject to Rule
    408(a) effluent limitations;
    2)
    whether the
    Agency has authority to impose Rule 408(a) effluent limitations
    as
    a
    condition
    to
    a NPDES permit; and 3)
    if
    so,
    whether
    the
    Agency
    should
    have
    done
    so
    in
    this case.
    45—100

    3
    The threshold issue is whether the Agency is authorized to
    impose Rule 408(a)
    limitations in the face of the provisions of
    Rule 602(c) and Reynolds’ compliance therewith.
    Part VI of the
    Water Rules is entitled “Performance Criteria” and contains spe-
    cific requirements concerning existing and potential sources of
    water pollution that,
    in the Board’s opinion, merit special con-
    sideration.
    Rule 602(c) specifically addresses the problem of
    existing combined sewers which are at the mercy of the vagaries
    of rainfall in the area.
    In adopting Rule 602(c), the Board
    acknowledged that treatment sufficient to assure that the waste
    water overflow from existing combined sewers complies with Rule
    408(a)
    limitations
    is technologically infeasible or economically
    unreasonable.
    Therefore, combined sewer systems in compliance
    with with Rule 602(c)(l) and
    (2) performance criteria are not also
    subject to Rule 408(a)’s limitations.
    If they were,
    there would
    be no need
    for Rule 602(c)(3), which authorizes the Agency to
    require additional treatment to prevent the accumulation of sludge
    deposits,
    depression
    of
    oxygen
    levels,
    or
    for
    removal
    of
    floating
    debris
    and
    solids,
    Although the effluent limitations set out in Rule 408(a) are
    normally not applicable to combined sewer systems which satisfy
    Rule
    602(c)
    performance
    criteria,
    the
    Agency
    has
    the
    authority
    to make them applicable when necessary to protect water quality,
    pursuant to Rule 9l0(a)(6).
    This authority was affirmed by the
    Second District Appellate Court
    in U.S.
    Steel Corporation v.
    Illinois Pollution Control Board,
    52 Ill.App.3d 1,
    9 Ill.Dec.893,
    367 N.E.2nd 327
    (1977), which determined that Rule 9l0(a)(6)
    constitutes a directive, not a delegation, from the Board to
    the Agency which is consistent with the Agency’s authority under
    Section 39(b) of the Illinois Environmental Protection Act
    (Act)
    to issue NPDES permits with those conditions necessary to accom-
    plish the purposes of the Act
    (c.f. Peabody Coal Company v.
    Illinois Pollution Control Board,
    36 Ill.App.3d
    5,
    344 N.E.2d
    279 5th District, 1976,
    and Illinois Power v. Illinois Pollution
    Control Board et al.,
    No.
    81—34,
    Appellate Court of Illinois,
    3rd
    District,
    Sept.
    30, 1981).
    That court did not limit the type
    of
    condition the Agency may impose, more than to say it must be
    necessary to carry out the provisions of the Act “prior to promul-
    gation by the Administrator of the U.S. Environmental Protection
    Agency of applicable effluent standards and limitations pursuant
    to Sections 301,
    302,
    306 and 307 of the FWPCA,” U.S.S. Corp.
    v.
    Illinois Pollution Control Board,
    367 N.E.2d at 335.
    In turn,
    the Board would not preclude the Agency from imposing conditions
    just because the particular conditions are not regulations
    normally applicable to the permittee.
    Having upheld the Agency’s authority to impose such condi-
    tions,
    the Board will now address the issue of equitable estoppel
    based upon prior Agency actions.
    Reynolds argues that the Agency
    is estopped from imposing the 408(a) restrictions in its reissued
    discharge permit because it had previously granted the construction
    and operating permit for the facility with which Reynolds achieved
    compliance with Rule 602(c), and that permit made no attempt to
    45—101

    4
    require Reynolds
    to
    eliminate the overflow discharges or sub~ec~
    the discharge
    to
    the effluent limitations of Rule 408(a),
    Although
    the Board acknowledges that the doctrine of equitable estoppel
    is
    applicable
    to State administrative agencies, we find
    that
    it does
    not lie
    in
    this
    case.
    The
    Agency did
    not, and indeed,
    could not
    relieve Reynolds from the impact of any conditions pursuant ~o the
    Act and the Boardvs
    regulations when
    it issued the construction and
    operating
    permit on
    October
    4,
    1974,
    since
    it
    has
    no such authority.
    Even if the Agency should issue such a construction permit which
    subsequently imposes a threat to the health and welfare
    of the
    people
    of the State of Illinois,
    it
    is the Board~sopinion
    that the
    Agency
    would not he estopped from its primary duty to protect the
    environment through the remainder of the NPDES permitting process.
    The
    Board finds that in this
    case the Agency is not estopped from
    imposing
    conditions premised
    on Rule 408(a)
    limitations
    on Reynolds
    combined sewer outflow,
    Having
    found that the
    Agency has
    the authority
    to impose
    conditions
    based on Rule
    408(a)
    limits
    and is
    in
    no way barred
    from doing
    so, the Board
    will now address
    the
    issue of whether or
    not the
    limitations
    imposed are shown as necessary in this case.
    The data presented in the Stipulation is the
    basis for the impo-
    sition of limitations by the Agency on Reynolds.
    It indicates
    that
    Petitioner~streatment complies with Rule 602(c) and overflow
    discharges have occurred approximately three times per year
    on an
    annual
    average basis,
    Review
    of
    the
    results of the grab samples
    taken during the discharges,
    corrected for grab sample analysis,
    indicate only two excursions
    of the oil and grease limitations
    of Rule 408(a)
    during the four years
    for which samples are avail-
    able.
    Considering
    the
    infrequent occurrences
    of discharge, and
    considering the
    even
    less
    frequent excursions over the limitations,
    and considering the type of discharge and the high rate of dilution
    that necessarily attends the discharge,
    the Board finds the proba-
    bility of harm to the environment is deminimus.
    Since the effects
    of the
    discharges
    on
    the
    environment are derninimus,
    the
    Board
    finds
    that
    the conditions based
    on 408(a)
    limits imposed by the
    Agency on
    Reynolds~
    reissued NPDES permit are not necessary in
    this case and shall he deleted from the reissued permit.
    This Opinion constitutes the finding of facts and the con-
    clusions of
    law of the Board in this matter.
    ORDER
    NPDES Permit No. IL000l34l
    issued by the Illinois Environ-
    mental
    Protection Agency on October
    12,
    1979 to Reynolds Metals
    Company for
    its
    facility located in McCook,
    Illinois
    is
    hereby
    remanded to the Agency
    for further consideration consistent
    with
    the Opinion herein.
    Mrs.
    Anderson and Mr. Anderson concurred.
    45—102

    5
    IT
    IS
    SO
    ORDERED.
    I,
    Christan
    L.
    Moffett,
    Clerk
    of
    the
    Illinois
    Pollution
    Control
    Board, hereb~certify that
    the above Opinion and Order were adopted
    on
    the
    ~
    day of
    ~
    1982
    by
    a
    vote
    of
    ~
    Christan
    L,
    Moffet41
    ~erk
    Illinois Pollution ~Qóitrol Board
    45—103

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