ILLINOIS POLLUTION CONTROL BOARD
    January
    23,
    1992
    IN THE MATTER OF:
    JOINT PETITION OF THE VILLAGE
    )
    PCB 85-212
    OF MORTON
    AND THE ILLINOIS
    )
    (Combined Sewer
    ENVIRONMENTAL PROTECTION AGENCY
    )
    Overflow Exception)
    FOR EXCEPTION TO COMBINED SEWER
    OVERFLOW REGULATIONS
    ORDER OF THE BOARD
    (by R.C.
    Flertial):
    This matter comes before the Board upon filing by the
    Village of Morton (“Morton”)
    on November 27,
    1991 of a motion to
    modify Board Order.
    On January 8,
    1992 the Illinois
    Environmental Protection Agency
    (“Agency”)
    filed a response
    requesting that the motion be granted.
    On January
    9,
    1992 the
    Board issued an order noting that facts asserted in the motion
    are not of record and were not supported by affidavit as required
    by the Board’s procedural rules.
    On January 21,
    1992 Morton
    filed
    an affidavit attesting to the facts at issue.
    Pursuant to the joint petitioners’ request,
    the Board on May
    9,
    1986
    (69 PCB 417) granted Morton an exception to the Board’s
    combined sewer overflow regulations.
    Among the requirements
    associated with that grant was chlorination of excess flows
    at
    Morton’s Plant
    2,
    as found
    in condition 1(a):
    a.
    The Village shall provide excess flow treatment at
    Plant
    2 for all excess flows reaching the plant,
    consisting of primary treatment followed by
    chlorine contact,
    including flow measurement and
    sampling
    .
    .
    .
    (69 PCB 422, emphasis added.)
    Petitioners now request that the chlorination requirement be
    deleted.
    All other conditions
    of the grant
    of exception have
    been met.
    The petitioners observe that other actions taken under the
    grant of exception have caused the volume of overflows at Plant
    2
    to be lower than originally expected.
    They also observe that the
    receiving stream, Prairie Creek,
    is of the nature that
    disinfection of the excess overflows is of questionable benefit
    and could even have an adverse effect on the stream.
    The Agency
    adds that complying with the chlorination requirement appears to
    be technically infeasible and that the cost of the constructing
    the necessary facilities would outweigh the benefits.
    129—253
    —2—
    The Board has observed that chlorination
    is a practice that
    must be applied selectively and involves
    a weighing of the
    relative risks to human health and the physical environment.
    (e.g.,
    In the Matter of: Amendments to Subtitle C: Water
    Pollution.
    Fecal Coliform and Seasonal Disinfection
    (June .30,
    1988), R85—29,
    90 PCB 635.)
    More recently,
    in a situation
    similar in many particulars to that faced by Morton, the Board
    found that the chlorination of CSOs should not be practiced by
    the City of Jacksonville.
    (In the matter of: Petition of the
    City of Jacksonville for ad-lusted standard from 35
    Ill. Adm.
    Code
    306.305(b)
    (August
    9,
    1990), AS 90—1,
    114 PCB 137).
    In view of these considerations,
    the motion to modify
    condition 1(a)
    of the Board’s grant of exception in this matter
    by deleting the phrase “followed by chlorine contact”
    is hereby
    granted.
    IT IS SO ORDERED.
    I, Dorothy N. Gunn,
    Clerk of the Illinois Pollution Control
    Board, ~ereby certify
    at the above Order was adopted on the
    ~
    day of
    ~
    ,
    1992,
    by a vote
    of
    Illinois
    Control Board
    129—254

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