Ohio Administrative Code
Title 3745 - Ohio Environmental Protection Agency
Chapter 3745-34 - Underground Injection Control Program
Section 3745-34-32 - Area of review
Current through all regulations passed and filed through December 16, 2024
The area of review of each injection well or each field or project shall be determined according to either paragraph (A) or (B) of this rule. The director may solicit input from the owners or operators of injection wells within the state as to which method is most appropriate for each geographic area or field.
(A) Zone of endangering influence.
r = [(2.25KHt) \ (S10x)]1/2
where
x = (4piKH [hw-hbo(SpGb) ] ) \ 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 = 3.142 (dimensionless)
The above equation is based on the following assumptions:
(B) Fixed radius.
(C) If the area of review is determined by a mathematical model pursuant to paragraph (A) of this rule, the permissible radius is the result of such calculation even if the area of review is less than one-fourth mile.