Current through Register Vol. 48, No. 38, September 20, 2024
a) At a
minimum, the owner or operator must conduct a water supply well survey to
identify all potable water supply wells located at the site or within 200 feet
of the site, all community water supply wells located at the site or within
2,500 feet of the site, and all regulated recharge areas and wellhead
protection areas in which the site is located. Actions taken to identify the
wells must include, but not be limited to, the following:
1) Contacting the Agency's Division of Public
Water Supplies to identify community water supply wells, regulated recharge
areas, and wellhead protection 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
supply wells; and
3) Contacting the
local public water supply entities to identify properties that receive potable
water from a public water supply.
b) In addition to the potable water supply
wells identified pursuant to subsection (a) of this Section, the owner or
operator must extend the water supply well survey if soil or groundwater
contamination exceeding the Tier 1 groundwater ingestion exposure route
remediation objectives of 35 Ill. Adm. Code 742 for the applicable indicator
contaminants extends beyond the site's property boundary, or, as part of a
corrective action plan, the owner or operator proposes to leave in place soil
or groundwater contamination exceeding the Tier 1 groundwater ingestion
exposure route remediation objectives of 35 Ill. Adm. Code 742 for the
applicable indicator contaminants and contamination exceeding such objectives
is modeled to migrate beyond the site's property boundary. At a minimum, the
extended water supply well survey must identify the following:
1) All potable water supply wells located
within 200 feet, and all community water supply wells located within 2,500
feet, of the current or modeled extent of soil or groundwater contamination
exceeding the Tier 1 groundwater ingestion exposure route remediation
objectives of 35 Ill. Adm. Code 742 for the applicable indicator contaminants;
and
2) All regulated recharge areas
and wellhead protection areas in which the current or modeled extent of soil or
groundwater contamination exceeding the Tier 1 groundwater ingestion exposure
route remediation objectives of 35 Ill. Adm. Code 742 for the applicable
indicator contaminants is located.
c) The Agency may require additional
investigation of potable water supply wells, regulated recharge areas, or
wellhead protection areas if site-specific circumstances warrant. Such
circumstances must include, but not be limited to, the existence of one or more
parcels of property within 200 feet of the current or modeled extent of soil or
groundwater contamination exceeding the Tier 1 groundwater ingestion exposure
route remediation objectives of 35 Ill. Adm. Code 742 for the applicable
indicator contaminants where potable water is likely to be used, but that is
not served by a public water supply or a well identified pursuant to
subsections (a) or (b) of this Section. The additional investigation may
include, but is not limited to, physical well surveys (e.g., interviewing
property owners, investigating individual properties for wellheads,
distributing door hangers or other material that requests information about the
existence of potable wells on the property, etc.).
d) Documentation of the water supply well
survey conducted pursuant to this Section must include, but not be limited to,
the following:
1) One or more maps, to an
appropriate scale, showing the following:
A)
The location of the community water supply wells and other potable water supply
wells identified pursuant to this Section, and the setback zone for each
well;
B) The location and extent of
regulated recharge areas and wellhead protection areas identified pursuant to
this Section;
C) The current extent
of groundwater contamination exceeding the Tier 1 groundwater ingestion
exposure route remediation objectives of 35 Ill. Adm. Code 742 for the
applicable indicator contaminants; and
D) The modeled extent of groundwater
contamination exceeding the Tier 1 groundwater ingestion exposure route
remediation objectives of 35 Ill. Adm. Code 742 for the applicable indicator
contaminants. The information required under this subsection (d)(1)(D) is not
required to be shown in a site investigation report if modeling is not
performed as part of site investigation;
2) One or more tables listing the setback
zones for each community water supply well and other potable water supply wells
identified pursuant to this Section;
3) A narrative that, at a minimum, identifies
each entity contacted to identify potable water supply wells pursuant to this
Section, the name and title of each person contacted at each entity, and field
observations associated with the identification of potable water supply wells;
and
4) A certification from a
Licensed Professional Engineer or Licensed Professional Geologist that the
water supply well survey was conducted in accordance with the requirements of
this Section and that the documentation submitted pursuant to subsection (d) of
this Section includes the information obtained as a result of the
survey.
