Current through Register Vol. 48, No. 38, September 20, 2024
a) When Board rules require a well survey to
determine the existence and location of potable water supply wells, the
following must be identified:
1) All private,
semi-private, and non-community water system wells located at the property
where the release occurred or within 200 feet of the property where the release
occurred;
2) All community water
system (CWS) wells located at the property where the release occurred or within
2,500 feet of the property where the release occurred; and
3) All setback zones and regulated recharge
areas in which all or any portion of the property where the release occurred is
located.
b) The person
performing the well survey must take action to identify the wells and
associated protected areas, including the following:
1) Contacting the Agency's Division of Public
Water Supplies to identify community water system wells and associated setback
zones and regulated recharge areas;
2) Using current information from the
Illinois State Geological Survey, the Illinois State Water Survey, and the
Illinois Department of Public Health (or the county or local health department
delegated by the Illinois Department of Public Health to permit potable water
supply wells) to identify potable water supply wells, other than community
water system wells, and their setback zones; and
3) Contacting the local public water supply
entities to identify properties that receive potable water from a public water
supply.
c) In addition
to subsections (a) and (b), persons subject to Subpart B may be required to
expand the area of the potable water supply well survey.
1) An expanded well survey is required if
measured or modeled groundwater contamination extends beyond a boundary of the
property where the release occurred in concentrations exceeding the remediation
objectives of 35 Ill. Adm. Code 742.Appendix B: Table E for the groundwater
ingestion exposure route or the groundwater quality standards at 35 Ill. Adm.
Code 620 (e.g., Class I, Class III).
A) If
there is no Table E objective or Part 620 standard, the Agency will determine
or approve an objective according to 35 Ill. Adm. Code 620.Subpart F.
B) The extent of modeled groundwater
contamination must be determined using the procedures of 35 Ill. Adm. Code 742
or another model approved by the Agency. When modeling the extent of
groundwater contamination, the modeling must include the impact from soil
contamination in concentrations exceeding the remediation objectives for the
soil component of the groundwater ingestion exposure route.
2) At a minimum, the expanded well
survey must identify the following:
A) All
private, semi-private, and non-community water system wells located within 200
feet, and all community water system wells located within 2,500 feet, of the
measured or modeled groundwater contamination exceeding the remediation
objectives of Part 742 for the groundwater ingestion exposure route or Part 620
groundwater quality standards; and
B) All setback zones and regulated recharge
areas in which any portion of the measured or modeled groundwater contamination
exceeding the remediation objectives of Part 742 for the groundwater ingestion
exposure route or Part 620 remediation objectives is located.
d) The Agency may,
based on site-specific circumstances or information collection deficiencies
(e.g., incomplete, conflicting or imprecise information, information assembled
from unverified sources), require additional investigation to determine the
existence or location of potable water supply wells, setback zones or regulated
recharge areas. The additional investigation may include physical well surveys
(e.g., interviewing property owners, investigating individual properties for
wellheads, distributing door hangers or other materials requesting information
about the existence of potable water supply wells).
e) Documentation of a potable water supply
well survey conducted under this Section must include the following:
1) One or more maps to a scale depicting the
following:
A) The locations of the community
water system wells and other potable water supply wells identified under this
Section;
B) The location and extent
of setback zones and regulated recharge areas identified under this Section;
and
C) The areas identified in
subsections (A) and (B) in relation to the measured or modeled groundwater
contamination exceeding the remediation objectives of Part 742 for the
groundwater ingestion exposure route or Part 620 groundwater quality
standards;
2) One or
more tables listing the setback zones and regulated recharge areas for each
community water system well and other potable water supply wells identified
under this Section; and
3) A
narrative that, at a minimum, lists each entity contacted to identify potable
water supply wells and protected areas, the name and title of each person
contacted, and any field observations while identifying and locating potable
water supply wells.
