Section 611.603 Inorganic Monitoring Frequency

Section 611

TITLE 35: ENVIRONMENTAL PROTECTION

SUBTITLE F: PUBLIC WATER SUPPLIES

CHAPTER I: POLLUTION CONTROL BOARD

PART 611 PRIMARY DRINKING WATER STANDARDS

SECTION 611.603 INORGANIC MONITORING FREQUENCY

Section 611.603  Inorganic

Monitoring Frequency

The frequency of monitoring

conducted to determine compliance with the revised MCLs in Section 611.301 for

antimony, arsenic, barium, beryllium, cadmium, chromium, cyanide, fluoride,

mercury, nickel, selenium, and thallium is as follows:

a)         Suppliers must take samples at each sampling point, beginning

in the initial compliance period, as follows:

1)         For a GWS supplier:  at least one sample during each

compliance period;

2)         For an SWS or a mixed system supplier:  at least one sample

each year.

BOARD NOTE:

Derived from 40 CFR 141.23(c)(1).

b)         SEP Application

1)         The supplier may apply to the Agency for a SEP that allows

reduction from the monitoring frequencies specified in subsection (a) under

subsections (d) through (f) and 35 Ill. Adm. Code 602.600.

2)         The supplier may apply to the Agency for a SEP that relieves

it of the requirement for monitoring cyanide under subsections (d) through (f)

and 35 Ill. Adm. Code 602.600 if it can demonstrate that its system is not

vulnerable due to a lack of any industrial source of cyanide.

BOARD NOTE:  Derived

from 40 CFR 141.23(c)(2) and (c)(6).

c)         SEP Procedures.  The Agency must review the request under the

SEP procedures of 35 Ill. Adm. Code 602.600 based on consideration of the

factors in subsection (e).

BOARD NOTE:  Derived

from 40 CFR 141.23(c)(6).

d)         Standard for SEP Reduction in Monitoring.  The Agency must

grant a SEP that allows a reduction in the monitoring frequency if the supplier

demonstrates that all previous analytical results were less than the MCL if the

supplier meets the following minimum data requirements:

1)         For GWS suppliers:  a minimum of three rounds of monitoring

OTE:  Derived

from 40 CFR 141.23(c)(6).

d)         Standard for SEP Reduction in Monitoring.  The Agency must

grant a SEP that allows a reduction in the monitoring frequency if the supplier

demonstrates that all previous analytical results were less than the MCL if the

supplier meets the following minimum data requirements:

1)         For GWS suppliers:  a minimum of three rounds of monitoring.

2)         For an SWS or mixed system supplier:  annual monitoring for at

least three years.

3)         A supplier that uses a new water source is not eligible for a

SEP until it completes three rounds of monitoring from the new source.

BOARD NOTE:  Derived

from 40 CFR 141.23(c)(4).

e)         Standard for SEP Monitoring Conditions.  As a condition of any

SEP, the Agency must require that the supplier take a minimum of one sample

during the term of the SEP.  In determining the appropriate reduced monitoring

frequency, the Agency must consider the following:

1)         Reported concentrations from all previous monitoring;

2)         The degree of variation in reported concentrations; and

3)         Other factors that may affect contaminant concentrations, such

as changes in groundwater pumping rates, changes in the CWS's configuration,

the CWS's operating procedures, or changes in stream flows or characteristics.

BOARD NOTE:  Derived

from 40 CFR 141.23(c)(3) and (c)(5).

f)         SEP Conditions and Revision

1)         A SEP will expire at the end of the compliance cycle for which

it was issued.

BOARD NOTE:  Derived

from 40 CFR 141.23(c)(3).

2)         In issuing a SEP, the Agency must specify the level of the

contaminant upon which the "reliably and consistently" determination

was based.  A SEP must provide that the Agency will review and, if appropriate,

revise its determination of the appropriate monitoring frequency when the

supplier submits new monitoring data or when other data relevant to the

supplier's appropriate monitoring frequency become available

he Agency must specify the level of the

contaminant upon which the "reliably and consistently" determination

was based.  A SEP must provide that the Agency will review and, if appropriate,

revise its determination of the appropriate monitoring frequency when the

supplier submits new monitoring data or when other data relevant to the

supplier's appropriate monitoring frequency become available.

BOARD NOTE:  Derived

from 40 CFR 141.23(c)(6).

g)         A supplier that exceeds the MCL as determined in Section

611.609, must monitor quarterly for that contaminant, beginning in the next

quarter after the violation occurred.

BOARD NOTE:

Derived from 40 CFR 141.23(c)(7).

h)         Reduction of Quarterly Monitoring

1)         The Agency must grant a SEP that reduces the monitoring

frequency to that specified by subsection (a) if it determines that the

sampling point is reliably and consistently below the MCL.

2)         A request for a SEP must include the following minimal

information:

A)        For a GWS:  two quarterly samples.

B)        For an SWS or mixed system supplier:  four quarterly samples.

3)         In issuing the SEP, the Agency must specify the level of the

contaminant upon which the "reliably and consistently" determination

was based.  Any SEP that allows less frequent monitoring based on an Agency

"reliably and consistently" determination must include a condition

requiring the supplier to resume quarterly monitoring for any contaminant under

subsection (g) if it violates the MCL specified by Section 611.609 for that

contaminant.

BOARD NOTE:

Derived from 40 CFR 141.23(c)(8).

i)          A new system supplier or a supplier whose system uses a new

source of water must demonstrate compliance with the MCL within a period of

time specified by a permit issued the Agency.  The supplier must also comply

with the initial sampling frequencies specified by the Agency to ensure a

system can demonstrate compliance with the MCL

t.

BOARD NOTE:

Derived from 40 CFR 141.23(c)(8).

i)          A new system supplier or a supplier whose system uses a new

source of water must demonstrate compliance with the MCL within a period of

time specified by a permit issued the Agency.  The supplier must also comply

with the initial sampling frequencies specified by the Agency to ensure a

system can demonstrate compliance with the MCL.  Routine and increased

monitoring frequencies must be conducted in compliance with this Section.

BOARD NOTE:

Derived from 40 CFR 141.23(c)(9).