Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 730 - UNDERGROUND INJECTION CONTROL OPERATING REQUIREMENTS
Subpart A - GENERAL
Section 730.106 - Area of Review
Current through Register Vol. 48, No. 38, September 20, 2024
The area of review for each injection well or each field, project, or area in Illinois must be determined according to either subsection (a) or (b). The Agency may solicit input from the owners or operators of injection wells within Illinois as to which method is most appropriate for each geographic area or field.
a) Zone of Endangering Influence.
r |
= |
[RADICAL] |
2.25 kHt |
S x 10x |
where:
x |
= |
4 [PI] KH (hw - hbo x SbGb) |
2.3Q |
r |
= |
Radius of endangering influence from injection well (length) |
k |
= |
Hydraulic conductivity of the injection zone (length/time) |
H |
= |
Thickness of the injection zone (length) |
t |
= |
Time of injection (time) |
S |
= |
Storage coefficient (dimensionless) |
Q |
= |
Injection rate (volume/time) |
hbo |
= |
Observed original hydrostatic head of injection zone (length) measured from the base of the lowermost underground source of drinking water |
hw |
= |
Hydrostatic head of underground source of drinking water (length) measured from the base of the lowest underground source of drinking water |
SpGb |
= |
Specific gravity of fluid in the injection zone (dimensionless) |
[PI] |
= |
3.14159(dimensionless) |
b) Fixed Radius
c) If the area of review is determined by a mathematical model pursuant to subsection (a), the permissible radius is the result of such calculation even if it is less than 402 meters (one-quarter mile).