35 Ill. Adm. Code 620.240
Class IV: Other Groundwater
Section 620
Section 620.240Â Class IV:
Other Groundwater
Except as provided in Section
620.250, Other Groundwater is as described in subsection (a), (b), (c), (d),
(e), (f), (g), or (h).
a)Â Â Â Â Â Â Â Â Groundwater within a zone of attenuation under 35 Ill. Adm.
Code 811 and 814.
b)Â Â Â Â Â Â Â Â Groundwater within a point of compliance under 35 Ill. Adm.
Code 724, but not to exceed a lateral distance of 200 feet from the edge of a
potential primary or secondary source.
c)Â Â Â Â Â Â Â Â Groundwater that naturally contains more than 10,000 mg/L of
total dissolved solids.
d)Â Â Â Â Â Â Â Â Groundwater that has been designated by the Board as an exempt
aquifer under 35 Ill. Adm. Code 730.104.
e)Â Â Â Â Â Â Â Â Groundwater that underlies a potential primary or secondary
source, in which contaminants may be present from a release, if the owner or
operator of the source notifies the Agency in writing and the following
conditions are met:
1)Â Â Â Â Â Â Â Â The outermost edge of what would be considered the Class IV
groundwater is the closest practicable distance from the source, but does not
exceed:
A)Â Â Â Â Â Â Â A lateral distance of 25 feet from the edge of the potential
source or the property boundary, whichever is less, and
B)Â Â Â Â Â Â Â A depth of 15 feet from the bottom of the potential source or
the land surface, whichever is greater;
2)Â Â Â Â Â Â Â Â The source of any release of contaminants to groundwater has
been controlled;
3)Â Â Â Â Â Â Â Â Migration of contaminants within the site resulting from a
release to groundwater has been minimized;
4)Â Â Â Â Â Â Â Â Any on-site release of contaminants to groundwater has been
managed to prevent migration off-site; and
5)Â Â Â Â Â Â Â Â No potable water well exists within the outermost edge as specified
in subsection (e)(1).
f)Â Â Â Â Â Â Â Â Groundwater that underlies a coal mine refuse disposal area
not contained within an area from which overburden has been removed, a coal
combustion waste disposal area at a surface coal mine authorized under Section
21(s) of the Act, or an impoundment that contains sludge, slurry, or
precipitated process material at a coal preparation plant, in which
contaminants may be present, if the area or impoundment began operating after
February 1, 1983, the owner and operator notifies the Agency in writing, and
the following conditions are met:
1)Â Â Â Â Â Â Â Â The outermost edge of what would be considered the Class IV
groundwater is the closest practicable distance from the area or impoundment,
but does not exceed:
A)Â Â Â Â Â Â Â A lateral distance of 25 feet from the edge of the area or
impoundment, or the property boundary, whichever is less; and
B)Â Â Â Â Â Â Â A depth of 15 feet from the bottom of the area or impoundment,
or the land surface, whichever is greater;
2)Â Â Â Â Â Â Â Â The source of any release of contaminants to groundwater has
been controlled;
3)Â Â Â Â Â Â Â Â Migration of contaminants within the site resulting from a
release to groundwater has been minimized;
4)Â Â Â Â Â Â Â Â Any on-site release of contaminants to groundwater has been
managed to prevent migration off-site; and
5)Â Â Â Â Â Â Â Â No potable water well exists within the outermost edge as specified
in subsection (f)(1).
g)Â Â Â Â Â Â Â Â Groundwater within a previously mined area, unless monitoring
demonstrates that the groundwater is capable of consistently meeting the
standards of specified in Section 620.410 or 620.420. If that capability is
determined, groundwater within the previously mined area must not be considered
Class IV.
h)Â Â Â Â Â Â Â Â Groundwater regulated under 35 Ill. Adm. Code 845.