ILLINOIS POLLUTION CONTROL BOARD
    September
    28, 1989
    IN THE MATTER OF:
    )
    AMENDMENTS TO 35
    ILL. ADM.
    )
    R84-12
    CODE 604.203 AND 605.104 OF
    )
    SUBTITLE
    F:
    PUBLIC WATER
    )
    SUPPLIES (Trihalomethanes)
    PROPOSED RULE
    SECOND NOTICE
    OPINION AND ORDER OF THE BOARD (by JD.
    Dumelle):
    On December 15,
    1988,
    the Board proposed for First Notice
    amendments
    to
    35
    Iii. Adm.
    Code Subtitle F which would expand the
    0.10 milligrams per liter
    (mg/i) standard for total
    Trihalomethanes
    (TTHM)
    in finished drinking water currently
    regulating public water supplies serving over 10,000 individuals
    to public water supplies serving
    fewer than 10,000 individuals.
    The proposed amendments were published
    in the Illinois Register
    on January 13,
    1989 at
    13
    Ill.
    Reg.
    255,
    262, and 269.
    On
    February
    24, 1989
    (13 Ill.
    Reg.
    2539)
    a Notice of Correction was
    published because two of
    the existing subsections
    (now being
    relabeled as subsections
    (e) and
    (f)) were inadvertently omitted
    from the First Notice publication.
    The Notice of Correction
    merely corrected that oversight and adds no new substance to the
    proposed amendments.
    The 45—day public comment period expired on
    March
    1,
    1989;
    five public comments were submitted.
    Today
    the
    Board adopts the proposed amendments
    for Second Notice.
    The five public comments were submitted as
    follows:
    Public
    Comment number (“P.C.~) 4,
    from the Northern Illinois Water
    Corporation,
    P.C.
    5 from the Administrative Code Division of the
    Office of the Secretary of State,
    P.C.
    6 from the Illinois
    Environmental Protection Agency
    (“Agency”), P.C.
    7 from WSCO
    Development,
    Inc.,
    and P.C.
    8 from Hickory Highlands Water
    Company.
    The Northern Illinois Water
    Corporation stated only that the
    proposed amendments will cause no problem because it
    is already
    performing the required
    tests.
    WSCO Development stated that
    it
    is a “small family owned and operated water company supplying
    approximately 200 customers.”
    Hickory Highlands Water Company
    stated that
    it
    is
    a “small
    family owned and operated water
    company supplying water
    to approximately 86 customers.
    The water
    is purchased from the City of Bloomington.”
    Apparently,
    these
    commenters are affected by the proposed regulations and are
    103—591

    —2—
    responding to the Board’s First Notice request for comment.
    The
    Board appreciates their comments.
    All of the comments set forth in P.C.
    5 from the
    Administrative Code Division have been incorporated into this
    Second Notice Order.
    The majority of the substantive comments were submitted
    in
    P.C.
    6 by
    the Agency.
    The Agency’s first comment
    is that
    it
    cannot provide the laboratory analyses to implement proposed
    Section 605.104(b).
    At First Notice Section 605.104(b) stated
    that a public water supply shall submit at least one initial
    sample per treatment plant
    to the Agency for analysis, and then
    submit either one sample annually or one sample quarterly
    thereafter depending on the results.
    The Agency argues that
    it
    cannot provide any sampling analysis whatsoever
    to implement
    proposed Section 605.104(b)
    because it does not have available
    funds for such laboratory analyses
    in its current budget.
    Thus,
    the Agency suggests changing the requirement
    to reflect that the
    sample shall be collected by the water supply, analyzed by a
    certified laboratory,
    and then reported to
    the Agency, thereby
    transferring the costs
    to the water supplies.
    The Board is sympathetic but not altogether persuaded by
    this position.
    Although the Board appreciates the Agency’s
    concerns, the Board does not believe that
    it is,
    or ought to be,
    precluded from adopting
    a necessary regulation for
    the sole
    reason that the Agency possesses scarce resources with which
    to
    implement the regulation.
    The Board notes
    that Section 14 of
    the
    Act states:
    The General Assembly finds
    that state
    supervision of public water supplies is
    necessary in order
    to protect the public from
    disease and to assure an adequate supply of
    pure water
    for all beneficial purposes.
    It
    is
    the purpose of
    this Title to assure adequate
    protection of public water supplies.
    To that end,
    Section 17 of
    the Act states:
    The Board may adopt regulations governing the
    location,
    design,
    construction, and continuous
    operation and maintenance of public water
    supplies
    installations, changes or additions
    which may affect the continuous sanitary
    quality, mineral quality,
    or adequacy of
    the
    public water
    supply, pursuant
    to Title VII of
    the Act.
    Section
    27 of Title VII states that in promulgating regulations
    the Board shall
    take into account:
    103—592

    —3—
    the existing physical conditions,
    the
    character of the area involved, including the
    character of surrounding land uses,
    zoning
    classifications,
    the nature of the existing
    air quality, or receiving body of water, as
    the case may be, and the technical feasibility
    and economic reasonableness of measuring or
    reducing the particular type of pollution.
    Clearly Section 14 of the Act articulates a policy of protecting
    the public from disease and contaminants
    in its public water
    supplies.
    Since 1982, Board regulations have established
    a
    maximum allowable concentration for
    TTHMs
    in the finished
    drinking water of public water supplies serving over 10,000
    individuals.
    The Board believes that individual consumers of
    public water supplies serving fewer
    than 10,000 are equally
    entitled
    to the same protection.
    Thus,
    the Board believes that
    the scope of the existing rules must be extended to cover
    supplies serving fewer than 10,000 individuals.
    That this will
    increase the workload of the Agency as a result
    is
    true; most
    Board rulemakings
    do.
    However,
    the Board is sympathetic
    to the Agency’s
    concerns.
    Consistent with the Board’s statutory responsibility
    to adopt economically reasonable regulations which assure
    adequate protection of public water supplies the Board has
    revised the language of
    Section 605.104(b).
    The Board has
    rewritten Section 605.104(b)
    to parallel the language of Section
    605.104(a), which requires the submission of either
    the sample or
    the analytical
    results of
    a sample from a certified laboratory.
    Were the Board to decline altogether
    to adopt
    a regulation
    simply
    because the Agency states
    that
    it cannot
    afford
    to
    implement it, the Board believes that
    it would be tantamount
    to
    delegating
    its rulemaking authority
    to the Agency in violation of
    the Act.
    For all effective proposes,
    the Agency would be
    deciding which rulemakings would proceed and which would not.
    But where,
    as here,
    the Board believes that the proposed rule is
    necessary to protect the public (served by supplies serving fewer
    than 10,000)
    and that it
    is technically feasible and economically
    reasonable,
    the Board will proceed
    to fulfill
    its responsibility
    under Sections 14,
    17, and
    27
    of the Act.
    Cost of Compliance
    The Agency’s next comment
    is
    that the Board “has not
    adequately considered
    the costs
    of
    the proposed regulation.”
    In
    addition to
    its previously addressed argument,
    the Agency states
    that another significant and unavoidable immediate cost to the
    Agency would be the revision of
    the Agency’s data system to
    include supplies under
    10,000.
    The Agency argues that the record
    103—503

    —4—
    maintenance for
    TTHM
    for supplies under 10,000 would have to be
    manually kept or
    revision of the present data system would
    be
    required.
    To revise the present data system to include the
    smaller supplies, the Agency estimates
    a cost
    of $5,000.
    The
    Agency also maintains that to implement the sampling in
    accordance with the proposed schedule, a general mailing to all
    supplies under 10,000
    needs
    to be done.
    The Agency points out
    that this mailing will be costly, another expense not provided
    for
    in the Agency budget.
    The Board
    is not unaware that
    the implementation of
    a
    regulation requires expenditures.
    The $5,000 cost
    to revise the
    data system and
    the unspecified cost of providing notice
    to the
    supplies does not appear
    to be unreasonable in light of the
    benefits derived.
    The Board points out that the Department of
    Energy and Natural Resources (DENR),
    in its Economic Impact Study
    (EcIS),
    found that the cost per examination
    (which includes
    4
    samples)
    is $215.40 and that the proposed rule potentially
    affects 381 public water supplies which
    in turn serve a total of
    846,432 individuals.
    They also estimate that less than 20
    of
    the sources are likely to be out of compliance with the proposed
    total TTHM standards.
    Nothing submitted in the Comments suggests
    that this estimation is
    in error.
    Thus,
    in light of the
    protection afforded those potential 846,432
    individuals, the
    Board believes the expenditures estimated above are reasonable.
    The Agency also states that the costs
    to public water
    supplies will be greater than those considered by the Board.
    As
    the Board has revised the text of Section 615.104(b), as noted
    above,
    the Agency’s comments on the costs of analysis
    to the
    supply merit attention.
    The Agency states that one of the
    greatest costs
    to the supplies will be the costs of upgrading the
    treatment plant.
    The Agency maintains that some satellite
    supplies may have no equipment at all, and will have to
    fund,
    design and construct equipment to come into compliance.
    The
    Agency, however,
    does not provide cost estimates.
    The Board is not persuaded.
    The EcIS provides approximately
    fourteen
    (14) alternative strategies available to public water
    supplies for reducing TTHMs and the costs associated with each.
    (EcIS, pp.
    45—73).
    Cost estimates vary depending on the strategy
    employed and the number of people served.
    Two of the strategies,
    “Control of Precursors at
    the Source” and “Moving the Point
    of
    Chlorination Downstream”
    require no direct capital costs and a
    minimal amount of labor time and resources to implement.
    Also,
    the costs associated with the other strategies do not appear
    to
    be unreasonable.
    The Board notes
    that
    the
    many variable factors,
    such as
    control strategies, population served, etc.,
    can result
    in many
    cost scenarios,
    some of which,
    if
    all else fails, may appear
    to
    be unreasonable.
    The Board notes that where compliance with this
    103—504

    —5—
    regulation would impose an unreasonable hardship upon the water
    supply, the Environmental Protection Act provides certain forms
    of relief.
    Sampling and Compliance Dates
    The Agency’s next comment is that the May—October,
    1989
    initial sampling date and the January
    1,
    1990 compliance date are
    arbitrary and unreasonable.
    The Agency argues that for at least
    a portion of the May—October,
    1989 sampling period,
    it
    is likely
    that no adopted regulations will exist.
    The Agency believes that
    public water supplies may be unwilling to initiate sampling
    in
    response to proposed regulations.
    Further, the Agency argues,
    even
    if the samples can be collected then more sampling will
    be
    required for many supplies.
    Further,
    the Agency argues
    If the initial sample exceeds 0.100 mg/l,
    one
    year of quarterly sampling must still be
    done.
    Requiring compliance by January
    1,
    1990
    will put many supplies cut of compliance with
    Board regulations even when sampling has not
    shown them to be
    in violation of the
    standardst
    The number of supplies
    in that
    situation could be significant, prompting a
    rash of variance applications whose compliance
    plan would consist of
    a request for one—year
    sampling.
    (P.C.#6,
    at
    p.4)
    The Agency believes that the first practical compliance date
    would be January
    1,
    1992.
    To a certain extent,
    the Board
    is
    persuaded
    to
    extend the
    dates
    for sampling and compliance.
    The Board agrees that the
    rulemaking proceeding may not become finally effective,
    i.e.,
    through Second Notice review by the Joint Committee on
    Administrative Rule
    (JCAR),
    final adoption, and filing with the
    Secretary of State, until after November
    1,
    1989.
    So as
    to
    provide adequate time in which to provide notice
    to the supplies
    and an opportunity to prepare to comply,
    the Board has amended
    the initial sampling dates
    to May
    1,
    1990 through October
    31,
    1990.
    Moreover,
    the Board believes that
    this extension will
    provide the Agency with adequate time to seek the resources
    necessary
    to implement
    the rule,
    as previously discussed.
    Similarly,
    the date of
    required
    compliance has also been
    extended.
    The Board believes
    that
    a compliance date of January
    1,
    1992 is
    reasonable.
    As samples will
    be submitted between May
    and October,
    1990,
    the supplies should be aware by late 1991
    whether or not they are in compliance,
    such that they can begin
    the intended process of coming into compliance.
    103-505

    —6—
    Given the compliance schedule,
    the Board
    is not persuaded to
    await the federal Disinfectant Byproduct Regulations.
    The Agency
    states that USEPA may adopt more stringent standards for TTHMs
    arid that these regulations are due for publication in early
    1990.
    The Agency believes apparently that for purposes of
    consistency with federal requirements, Illinois would do well to
    await federal action.
    As the Board stated
    in its first Notice
    Opinion, USEPA’s current timetable,
    as articulated in its
    semiannual Regulatory Agenda
    (53 Fed.
    Reg.
    42492),
    is as
    follows:
    Notice of proposed Rulemaking
    in September,
    1990,
    and
    Final Action on the rulemaking
    in September,
    1991.
    The Agency
    has offered no support
    for its statement that
    the federal
    regulation
    is
    “due for publication in early 1990.”
    Further,
    the
    Board notes that TJSEPA’s timetable
    is speculative as the proposal
    itself
    is a year and half away.
    Finally, even if USEPA adheres
    to its articulated schedule,
    it
    is unlikely that public water
    supplies will be required to begin sampling until
    the summer
    of
    1992,
    thereby extending a compliance date to possibly 1993.
    Based on these considerations the Board finds that awaiting
    federal action
    is not
    in the best interest of the public.
    The
    Board will therefore proceed.
    State Mandates Act
    The Agency’s next comment
    is that the State Mandates Act
    (Ill. Rev.
    Stat.
    ch.
    85,
    para 2201 et seq.
    (1987)) will likely
    apply.
    The Agency states that
    in this proceeding
    the Board
    is
    proposing to extend the existing TTHM regulations beyond the
    scope of the federal mandate
    (40 CFR 141.30)
    to apply to surface
    water supplies serving
    fewer than 10,000 people.
    The Agency
    argues that because the Board’s action exceeds the federal
    mandate and requires expansion of services and additional
    expenditures of local government,
    the Board is creating
    a state
    mandate.
    The Agency’s argument on this point
    is as follows:
    Section 6(b) of the State Mandates Act
    requires that the General Assembly shall
    reimburse the local government at least
    50
    but not more than 100
    of the increase in cost
    attributable to the mandate, unless the
    service mandates meets one of the exclusion
    requirements.
    The most applicable of the
    service mandate exclusions would likely be
    that excluding annual net costs of less than
    $1,000.
    If
    the mandated testing costs
    less
    than $1,000,
    the exclusion may apply.
    Interpretation of the Board rule may or
    may
    not
    include the cost of control
    for TTHM as
    being mandated by the regulation.
    Ostensibly,
    th
    regulation only mandates
    a TTHM standard,
    no~installation of control equipment.
    But,
    in reality, imposition of any standard does
    103—596

    —7—
    mandate for some community water supplies the
    installation of control equipment.
    A question regarding the actual enforceability
    of this regulation would exist
    if the State
    Mandates Act does apply.
    Section
    8 of the Act
    states that if the General Assembly has not
    made the necessary appropriations to implement
    the service mandate,
    the local government
    is
    relieved of the obligation to implement the
    service mandate.
    Court interpretation of the applicability of
    the State Mandates Act on a case—by-case basis
    could impose some formidable legal burdens on
    the enforcement of these regulations.
    (P.C.#6
    at
    p.
    7)
    The Board concurs with the Agency inasmuch as the Board
    believes that the State Mandates Act may apply.
    However,
    the
    Board does not share
    the Agency’s apparent position that the
    possible application of the State Mandates Act should have
    a
    chilling effect on the progress of Board rulemakings.
    Despite the existence of the State Mandates Act since 1981,
    the Board notes
    that
    the issue of its applicability to a
    particular Board rulemaking proceeding is here of first
    impression.
    Although the Board complies with Section
    5 of the
    State Mandates Act by preparing a statement of Statewide Policy
    Objectives
    for each of its rulemakings,
    the Board has not been
    called upon
    to address the
    interplay,
    if any, between the Board’s
    rulemaking authority and the provisions of
    the State Mandates
    Act.
    As previously set forth
    in the Opinion,
    the Board’s
    rulemaking authority
    is generally set
    forth
    in Section
    27
    of the
    Act.
    Section 27 requires the Board to consider certain aspects
    of the proposal.
    With regard
    to State Mandates Act
    interplay,
    the most relevant consideration is that of “economic
    reasonableness of measuring or reducing the particular
    type of
    pollution.”
    In this rulemaking,
    the Board has found that the
    implementation of the regulation will be economically
    reasonable.
    The Board believes that this finding of economic
    reasonableness exists whether or not the State Mandates Act
    applies and its provisions are carried out.
    The Board believes
    that the regulation
    is necessary to protect the public and that
    the costs
    to those who must comply are reasonable.
    That
    the
    State Mandates Act may provide assistance
    to local governments
    in
    the implementation of
    this
    regulation
    is well and good; however,
    it does not figure
    into the Board’s consideration of economic
    reasonableness.
    In other words,
    if the State Mandates Act does
    not operate to provide assistance
    to
    a local government,
    that
    does not change the finding of economic reasonableness.
    It does
    103--597

    —8—
    not make an economically reasonable rule economically
    unreasonable.
    Thus,
    the Board does not believe that,
    in this proceeding,
    the States Mandates Act merits further consideration;
    the Board
    has found the rule to be economically reasonable in and of
    itself.
    As
    its final comment,
    the Agency responded
    to three
    questions raised in the First Notice Opinion.
    First,
    the Agency
    stated that the language of Section 605.104(a)
    should not be
    amended to clarify specifically where samples should be taken.
    The Agency argues that because each supply is different,
    no one
    specific place for sampling can be identified
    for all systems.
    The Agency maintains that it must work with the supply to
    determine the appropriate sampling points.
    The Board accepts the
    Agency’s position and will not change the language.
    Second,
    the Agency states that it
    is unaware of any
    circumstances when a sample cannot be analyzed for maximum
    residence time concentration
    (MRTC), except where collection or
    lab errors occur as a result of air bubbles
    in the sample.
    Thus,
    it
    is the Agency’s position that no other method of testing
    should be specified.
    Here,
    too,
    the Board accepts the Agency
    position and will not change
    the language.
    Finally,
    the Agency states that because
    it cannot perform
    analyses for the supplies but forsees a possibility of private
    backlog,
    the phasing in of the regulation should be provided such
    that all sampling must be completed within
    18 months of the May
    following adoption.
    As the Board extended the deadlines for
    sampling and compliance,
    as discussed above, the Board believes
    that
    a phasing—in period is no longer warranted.
    ORDER
    The following amendments are hereby proposed for Second
    Notice.
    The Clerk of the Board
    is directed to submit these
    proposed amendments to the Joint Committee On Administrative
    Rules.
    TITLE
    35:
    ENVIRONMENTAL PROTECTION
    SUBTITLE F:
    PUBLIC WATER SUPPLIES
    CHAPTER
    I:
    POLLUTION CONTROL BOARD
    PART 601
    INTRODUCTION
    Section
    601.101
    General Requirements
    601.102
    Applicability
    103-593

    —9—
    601.103
    Severability
    601.104
    Analytical Testing
    601.105
    Definitions
    Appendix
    References to Former Rules
    AUTHORITY:
    Implementing Section 17 and authorized by Section
    27
    of
    the Environmental Protection Act
    (Ill.
    Rev.
    Stat.
    1987,
    ch.
    111 1/2,
    pars. 1017 and 1027).
    SOURCE:
    Filed with Secretary of State January
    1,
    1978;
    amended
    at
    2 Il~
    .
    Reg.
    36,
    p.
    72, effective August
    29,
    1978;
    amended at
    3 Ill.
    Reg.
    13, p.
    236, effective March 30,
    1979;
    amended and
    codified at
    6
    Ill.
    Reg.
    11497, effective September
    14,
    1982;
    amended at
    6
    Ill. Reg.
    14344, effective November
    3,
    1982;
    amended in R84—12 at
    Reg.
    ________
    effective
    __________________
    Section 601.105
    Definitions
    For purposes of
    this Chapter:
    “Maximum Residence Time Concentration”
    (MRTC) means the
    concentration of total trihalomethanes
    found in a water
    sample taken at
    a point of maximum residence time in the
    public water supply distribution system.
    “Point Of Maximum Residence Time”
    means
    that part of
    the active portion of the distribution system remote
    from the treatment plant where
    the water has been
    in the
    distribution
    system for the longest period of
    time.
    (SOURCE:
    Amended at
    Ill. Reg.
    effective
    _______________
    TITLE
    35:
    ENVIRONMENTAL PROTECTION
    SUBTITLE
    F:
    PUBLIC WATER SUPPLIES
    CHAPTER
    I:
    POLLUTION CONTROL BOARD
    PART 604
    FINISHED WATER AND
    RAW
    WATER QUALITY AND QUANTITY
    SUBPART
    A:
    BACTERIOLOGICAL QUALITY
    SUBPART
    B:
    CHEMICAL AND PHYSICAL QUALITY
    Section
    604.201
    Finished Water Quality
    604.202
    Contaminants and Maximum Allowable Concentrations
    604.203
    Exceptions
    to Maximum Allowable Concentrations
    604.204
    Action Pursuant
    to Exceedance of Maximum Allowable
    Concentration
    103-

    —10—
    AUTHORITY:
    Implementing Section
    17 and authorized by Section
    27
    of the Environmental Protection Act
    (Ill.
    Rev.
    Stat., 1987,
    ch.
    111 1/2, pars.
    1017 and 1027).
    SOURCE:
    Filed with Secretary of State January
    1,
    1978;
    amended
    at
    2
    Ill. Reg.
    36,
    p.
    72, effective August
    29,
    1978;
    amended at
    3
    Ill.
    Reg.
    13,
    p.
    236, effective March 30,
    1979;
    amended and
    codified at
    6
    Ill. Reg.
    11497, effective September
    14,
    1982; amended at
    6
    Ill. Reg.
    14344, effective, November
    3,
    1982;
    amended in R84—l2 at
    Ill.
    Reg.
    effective
    _________________
    Section 604.203
    Exceptions
    to Maximum Allowable Concentrations
    The following supplementary conditions apply
    to the concentra-
    tions listed
    in Section 604.202.
    d)
    Total Trihalomethanes:
    2)
    Supplies serving
    ~s7ee~
    10,000
    or more individuals
    shall comply with the Total Trihalomethanes
    standard listed in Section 604.202 by
    the
    effee~ve
    date ef these re
    k~ens.
    Supplies serving l97eeG~
    ~e 5~47999fewer
    than 10,000 individuals shall
    comply with this standard by N~errtbe~S~
    ~983
    January 1,
    1992.
    Ph~ss~er~derd
    dees r~etepp~y~e
    supp34e~serv4rtg 3ess ther~l~y9G9~s-~
    (SOURCE:
    Amended at
    Ill. Reg.
    effective
    _______________
    TITLE 35:
    ENVIRONMENTAL PROTECTION
    SUBTITLE F: PUBLIC WATER SUPPLIES
    CHAPTER
    I:
    POLLUTION CONTROL BOARD
    PART 605
    SAMPLING AND MONITORING
    Section
    605.101
    Frequency of Bacteriological Sampling
    605.102
    Minimum Allowable Monthly Samples
    for
    Bacteriological Analysis
    605.103
    Frequency of Chemical Analysis Sampling
    605.104
    Frequency of Trihalomethane Analysis Sampling
    605.105
    Monitoring Requirements for Radium—226,
    —228, and
    Gross Alpha Particle Activity
    605.106
    Monitoring Frequency for Radium—226,
    —228,
    and
    Gross Alpha Particle Activity
    605.107
    Monitoring Requirements for Man—Made Radioactivity
    605.108
    Monitoring Frequency for Man—Made Radioactivity
    103—600

    —11—
    605.109
    Surface Water Supplies Additional Monitoring
    Requirements
    605.110
    Modification of Monitoring Requirements
    Appendix
    References
    to Former Rules
    AUTHORITY:
    Implementing Section 17 and authorized by Section
    27
    of the Environmental Protection Act
    (Ill.
    Rev.
    Stat.
    1987,
    ch.
    111 1/2,
    pars.
    1017 and 1027).
    SOURCE:
    Filed with Secretary of State January
    1,
    1978;
    amended
    at
    2 Ill. ~eg. 36,
    p.
    72, effective August
    29, 1978;
    amended and
    codified at
    6 Ill. Reg.
    11497,
    effective September 14,
    1982; amended at
    6 Ill.
    Reg.
    14344,
    effective November
    3,
    1982;
    amended in R84—l2 at
    ____
    Ill. Reg.
    ______,
    effective
    ____________________
    Section 605.104
    Frequency of Trihalomethane Analysis Sampling
    a)
    Surface Water Sources for Supplies Serving 10,000 or
    More Individuals:
    Supplies serving 10,000
    or more indi-
    viduals shall submit at
    least four samples per treatment
    plant per quarter
    for analysis or analytical results
    from a certified laboratory for Total Trihalomethanes
    to
    the Agency.
    After results of
    four consecutive quarters
    demonstrate consistent Total Trihalomethanes
    concentrations below the Maximum Allowable
    Concentration, and upon written application by the
    supply,
    the Agency may reduce the sampling frequency to
    one sampling per quarter until
    the Maximum Allowable
    Concentration is exceeded or until
    a significant change
    in source or treatment method
    is made.
    b)
    Surface Water Sources
    for Supplies Serving Fewer
    than
    10,000
    Individuals:
    Supplies serving fewer
    than 10,000
    individuals shall submit at least one initial sample per
    treatment plant
    for analysis or analytical results
    from
    a certified
    laboratory for Maximum Residence Time
    Concentration
    (MRTC)
    taken between May
    1,
    1990 and
    October
    31,
    1990.
    After written request by the supply
    and the determination by the Agency that the results of
    the sample indicate that the supply
    is not likely to
    exceed the Maximum Allowable Concentration the supply
    shall continue
    to submit one annual sample per treatment
    plant
    for analysis
    or analytical results from
    a
    certified laboratory
    to
    the Agency taken between May
    1
    and October
    31 of succeeding years.
    If the sample
    exceeds
    the Maximum Allowable Concentration,
    the supply
    shall submit
    to the Agency samples
    in accordance with
    the sampling frequency specified
    in Section 605.104(a)
    above.
    103 ~01

    —12—
    bc)
    Groundwater Sources for Supplies Serving 10,000 or More
    Individuals:
    Supplies serving 10,000
    individuals or
    more shall submit at least one sample per treatment
    plant
    for MTP analysis.
    After written request by the
    supply and the determination by
    the Agency that the
    results of the sample and local conditions indicate that
    the supply is not likely to approach or exceed the
    maximum allowable concentration, the supply shall
    continue to submit one annual sample per treatment
    plant,
    or
    report of analysis by certified laboratory
    to
    the Agency.
    If the sample exceeds the Maximum Allowable
    Concentration or cannot be analyzed for MTP, the supply
    shall submit samples
    in accordance with Section
    605.104(a).
    ~.J
    Groundwater Sources
    for Supplies Serving Fewer Than
    10,000 Individuals
    Supplies serving fewer than 10,000
    individuals are not required to submit samples for
    trihalomethane analysis under
    this Section.
    ce)
    Significant changes
    in water sources
    or treatment will
    require testing
    in accordance with Section 605.104(a).
    df
    If the
    result of an analysis made pursuant
    to the
    reduced monitoring schedules provided by Section
    605.104(a)
    indicates that the level of Total
    Trihalomethanes exceeds the Maximum Allowable
    Concentration listed
    in Section
    604.202,
    the owner
    or
    operator
    of the supply shall initiate analysis of one
    check sample promptly after the exceedance
    is reported
    to the supply.
    If the check sample confirms that
    the
    level
    of Total Trihalomethanes
    exceeds the Maximum
    Allowable Concentration,
    the supply shall sample
    in
    accordance with the frequency set out
    in Section
    605.104(a),
    for at least one year.
    (Source:
    Amended at
    Ill.
    Reg.
    effective
    _______________
    IT IS SO ORDERED.
    I, Dorothy M. Gunn,
    Clerk of the Illinois Pollution Control
    Board,
    hereby certif
    that the above Opin’on and Order
    was
    adopted on the
    _____________
    day of
    ~
    1989 by a vote
    of
    ____________.
    •~2.
    ‘Dorothy M. 9~mnn, Clerk
    Illinois Poilution Control Board
    103-602

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