ILLINOIS POLLUTION CONTROL BOARD
    January 27,
    1983
    ISP,
    INC.,
    )
    )
    Petitioner,
    )
    v.
    )
    PCB 82—131
    )
    fLLINOIS ENVIRONMENTAL
    )
    PROTECTION AGENCY,
    )
    )
    Respondent.
    )
    SUPPLEMENTAL STATEMENT (By 3.0.
    Dumell.e):
    The record as it relates to the efficiency of
    the
    existing
    treatment plant and any alternatives is deficient.
    Bow can the efficiency of the aerated cell be
    -
    66.8?
    This means that 166.8
    more BOO is discharged than is received
    flow
    can BOO be created
    if
    in fact the cell is aerated?
    Was
    this the result of high winds which stirred up
    bottom
    deposits
    which had a high BOO?
    Secondly, the Illinois Environmental Protection Agency’s
    (Agency)
    loading computations (the 22 lbs/ac./day standard, etc.)
    on
    the
    aerobic
    lagoons
    a? I assume a series
    feed.
    Why
    cannot
    the
    lagoons
    be
    operated in parallel?
    If this is done,
    the
    total
    acreage available rises from 41
    to
    81
    and
    consequently
    the
    loi~nj~
    per acre drop about 50.
    Lastly,
    if the natural aeration capability of
    the
    three
    aerated lagoons is in fact limited to 22 lbs/ac./day why cannot
    Lt
    be increased by adding mechanical aerators?
    Are the lagoons
    too shallow to do this?
    Or do they also function as final clan-
    fiers?
    If an extension is needed to the instant variance the above
    gaps in the record ought to he addressed.
    It also is not clear
    why 18 months is required to construct an oxidation ditch and
    an intra—channel clarifier.
    Why cannot these facilities be
    built in a single construction season during 1983?
    A fuller explanation would have been of great help on all
    of these points.
    51-67
    2
    I,
    Christari L.
    Moffett, Clerk of the Illinois Pollution control
    Board, hereby certify that the above Supplemental Statement was
    filed
    on
    the
    J~_day
    of
    ~
    1982.
    Christan
    L.
    Moffe~t”,iClerk
    Illinois Pollution control Board
    51-68

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