ILLINOIS POLLUTION CONTROL BOARD
    June
    23,
    1992
    COMMONWEALTH EDISON COMPANY,
    )
    (PATTERSON ROAD IN JOLIET)
    )
    Petitioner,
    v.
    )
    PCB 91—178
    )
    (Permit Appeal)
    (Consolidated)
    ILLINOIS ENVIRONMENTAL
    PROTECTION AGENCY,
    Respondent.
    COMMONWEALTH EDISON COMPANY,
    )
    (LARKIN AVENUE IN JOLIET)
    )
    Petitioner,
    V.
    )
    PCB 91—180
    )
    (Permit Appeal)
    )
    (Consolidated)
    ILLINOIS ENVIRONMENTAL
    PROTECTION AGENCY,
    Respondent.
    ORDER OF THE BOARD
    (by G.T.
    Girard):
    On
    June
    16,
    1992,
    the
    parties
    filed
    a
    status
    report
    as
    directed by the Board’s order of April 9,
    1992.
    The parties report
    that
    the
    permit
    condition
    which
    is
    the
    subject
    of
    these
    consolidated appeals concerns compliance with effluent limitations
    for
    bromine—based
    biocides
    in
    Commonwealth
    Edison’s
    condenser
    cooling water.
    At the time the permit was issued, USEPA had before
    it a chemical industry study on the toxicity of bromine biocides.
    USEPA
    has
    recently
    concluded
    its
    review
    of
    the
    study,
    which
    indicates with more precision the levels at which bromine has toxic
    effects.
    Based
    on
    the results
    of
    the
    study,
    the
    Agency
    and
    Commonwealth
    Edison
    are
    currently
    engaged
    in
    settlement
    discussions, and have reached agreement in principle.
    The points
    which remain to be
    finalized
    included evaluation
    of
    alternative
    cleaning mechanisms
    for Commonw~alth Edison’s condensers
    and
    a
    schedule for compliance with the bromine effluent limitation to be
    placed in the company’s modified NPDES permits.
    Once
    the
    specific
    terms
    of
    Commonwealth
    Edison’s modified
    permits are set, the Agency will reinitiate the NPDES draft permit
    1 34—325
    2
    public comment and review process required by 40 CFR Part 124.
    At
    the end of that process, the Agency expects to issue final modified
    NPDES “settlement” permits to Commonwealth Edison.
    The parties are directed to file an updated status report
    on.
    or before September 15, 1992.
    This updated report shall contain an
    estimated date for the conclusion of this matter.
    IT IS SO ORDERED.
    I,
    Dorothy M. Gunn,
    Clerk of the Illinois Pollution Control
    Board,, hereby certify-)that the above order was adopted on the
    ~
    ~day
    of
    ()-~--i-.~~—
    ,
    1992, by a vote of
    7~
    ~Dorothy
    M. G~n, Clerk
    Illinois Pollution Control Board

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