a) The
Agency must evaluate a request for a
SEP granting relief from monitoring requirements of Section
611.601,
611.602, or
611.603 (
IOCs, excluding the Section
611.603 monitoring frequency requirements for cyanide); Section
611.646(f) (a
GWS supplier for
Phase I,
Phase II, and
Phase V VOCs); Section
611.646(d) (only as to initial monitoring for 1,2,4-trichlorobenzene); or Section
611.648(d) (
Phase II,
Phase IIB, and
Phase V SOCs) under this Section. The
Agency must evaluate on the basis of known previous use (including transport, storage, or disposal) of the
contaminant in the watershed or zone of influence of the system under 35 Ill. Adm. Code
671.
BOARD NOTE: The Agency may only issue a SEP from the Section 611.603 monitoring frequency for cyanide based on subsection (c), not based on this subsection (a).
1) If the Agency determines that there was no prior use of the contaminant in the water system's watershed or zone of influence, the Agency must issue the SEP; or
2) If anyone previously used the
contaminant or the previous use is unknown, the
Agency must consider certain factors:
A) Previous analytical results;
B) The system's proximity to any possible point source of contamination (including spills or leaks at or near a water treatment facility; at manufacturing, distribution, or storage facilities; from hazardous and municipal waste land fills; or from waste handling or treatment facilities) or non-point source of contamination (including the use of pesticides and other land application uses of the contaminant);
C) The environmental persistence and transport of the contaminant;
D) How well local conditions protect the water
source against contamination, including:
i) For a GWS, well depth, soil type, well casing integrity, and wellhead protection; and
ii) For an SWS, watershed protection;
E) For
Phase II,
Phase IIB, and
Phase V SOCs:
i) Elevated nitrate levels at the water source; and
ii) The use of PCBs in equipment the supplier uses to produce, store, and distribute water (including pumps, transformers, etc.); and
F) For
Phase I,
Phase II, and
Phase V VOCs (under Section
611.646), the number of persons the
PWS serves, and the proximity of a smaller system to a larger one.
b) If a supplier refuses to provide any necessary additional information the Agency requests, or if a supplier delivers any necessary information late in the Agency's deliberations on a request, the Agency may deny the SEP or issue the SEP with conditions within the time allowed by law.
c) The Agency must issue a SEP allowing a supplier to discontinue monitoring for cyanide upon determining that the supplier's water is not vulnerable to any industrial source of cyanide.
