Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 620 - GROUNDWATER QUALITY
Subpart B - GROUNDWATER CLASSIFICATION
Section 620.210 - Class I: Potable Resource Groundwater
Universal Citation: 35 IL Admin Code ยง 620.210
Current through Register Vol. 48, No. 38, September 20, 2024
Except as provided in Sections 620.230, 620.240, or 620.250, Potable Resource Groundwater is:
a) Groundwater located 10 feet or more below the land surface and within:
1) The minimum setback zone of a well which
serves as a potable water supply and to the bottom of such well;
2) Unconsolidated sand, gravel or sand and
gravel which is 5 feet or more in thickness and that contains 12 percent or
less of fines (i.e., fines which pass through a No. 200 sieve tested according
to ASTM Standard Practice D2487-06, incorporated by reference at Section
620.125
);
3) Sandstone which is 10 feet or
more in thickness, or fractured carbonate which is 15 feet or more in
thickness; or
4) Any geologic
material which is capable of a:
A) Sustained
groundwater yield, from up to a 12 inch borehole, of 150 gallons per day or
more from a thickness of 15 feet or less; or
B) Hydraulic conductivity of 1 x
10-4 cm/sec or greater using one of the following
test methods or its equivalent:
i)
Permeameter;
ii) Slug test;
or
iii) Pump test.
b) Any groundwater which is determined by the Board pursuant to petition procedures set forth in Section 620.260, to be capable of potable use.
BOARD NOTE: Any portion of the thickness associated with the geologic materials as described in subsections 620.210(a)(2), (a)(3) or (a)(4) should be designated as Class I: Potable Resource Groundwater if located 10 feet or more below the land surface.
Disclaimer: These regulations may not be the most recent version. Illinois may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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