Source: https://www.law.cornell.edu/cfr/text/40/146.6
Timestamp: 2016-07-26 07:06:39
Document Index: 40526985

Matched Legal Cases: ['art 146', '§ 146', '§ 122', '§ 122', '§ 122', '§ 122', '§ 146', '§ 122', '§ 122', '§ 122', '§ 122', '§ 300', '§ 300', '§ 6901', '§ 6901', '§ 6902', '§ 6903', '§ 6904', '§ 6905', '§ 6906', '§ 6907', '§ 6908', '§ 6908', '§ 6925', '§ 6927', '§ 6974']

40 CFR 146.6 - Area of review. | US Law | LII / Legal Information Institute
CFR › Title 40 › Chapter I › Subchapter D › Part 146 › Subpart A › Section 146.6 40 CFR 146.6 - Area of review.
§ 146.6
Area of review.
The area of review for each injection well or each field, project or area of the State shall be determined according to either paragraph (a) or (b) of this section. 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.
Zone of endangering influence.
The zone of endangering influence shall be:
In the case of application(s) for well permit(s) under § 122.38 that area the radius of which is the lateral distance in which the pressures in the injection zone may cause the migration of the injection and/or formation fluid into an underground source of drinking water; or
In the case of an application for an area permit under § 122.39, the project area plus a circumscribing area the width of which is the lateral distance from the perimeter of the project area, in which the pressures in the injection zone may cause the migration of the injection and/or formation fluid into an underground source of drinking water.
Computation of the zone of endangering influence may be based upon the parameters listed below and should be calculated for an injection time period equal to the expected life of the injection well or pattern. The following modified Theis equation illustrates one form which the mathematical model may take.
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
Sp Gb=Specific gravity of fluid in the injection zone (dimensionless)
π=3.142 (dimensionless)
The above equation is based on the following assumptions:
The injection zone is homogenous and isotropic;
The injection zone has infinite area extent;
The injection well penetrates the entire thickness of the injection zone;
The well diameter is infinitesimal compared to “r” when injection time is longer than a few minutes; and
The emplacement of fluid into the injection zone creates instantaneous increase in pressure.
Fixed radius.
In the case of application(s) for well permit(s) under § 122.38 a fixed radius around the well of not less than one-fourth (1/4) mile may be used.
In the case of an application for an area permit under § 122.39 a fixed width of not less than one-fourth (1/4) mile for the circumscribing area may be used.
In determining the fixed radius, the following factors shall be taken into consideration: Chemistry of injected and formation fluids; hydrogeology; population and ground-water use and dependence; and historical practices in the area.
If the area of review is determined by a mathematical model pursuant to paragraph (a) of this section, the permissible radius is the result of such calculation even if it is less than one-fourth (1/4) mile.
[45 FR 42500, June 24, 1980, as amended at 46 FR 43161, Aug. 27, 1981; 47 FR 4999, Feb. 3, 1982]
§ 146.6 Area of review.
The area of review for each injection well or each field, project or area of the State shall be determined according to either paragraph (a) or (b) of this section. 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)
(1) The zone of endangering influence shall be:
(i) In the case of application(s) for well permit(s) under § 122.38 that area the radius of which is the lateral distance in which the pressures in the injection zone may cause the migration of the injection and/or formation fluid into an underground source of drinking water; or
(ii) In the case of an application for an area permit under § 122.39, the project area plus a circumscribing area the width of which is the lateral distance from the perimeter of the project area, in which the pressures in the injection zone may cause the migration of the injection and/or formation fluid into an underground source of drinking water.
(2) Computation of the zone of endangering influence may be based upon the parameters listed below and should be calculated for an injection time period equal to the expected life of the injection well or pattern. The following modified Theis equation illustrates one form which the mathematical model may take.
(i) The injection zone is homogenous and isotropic;
(ii) The injection zone has infinite area extent;
(iii) The injection well penetrates the entire thickness of the injection zone;
(iv) The well diameter is infinitesimal compared to “r” when injection time is longer than a few minutes; and
(v) The emplacement of fluid into the injection zone creates instantaneous increase in pressure.
(1) In the case of application(s) for well permit(s) under § 122.38 a fixed radius around the well of not less than one-fourth (
1/4) mile may be used.
(2) In the case of an application for an area permit under § 122.39 a fixed width of not less than one-fourth (
1/4) mile for the circumscribing area may be used.
(c) If the area of review is determined by a mathematical model pursuant to paragraph (a) of this section, the permissible radius is the result of such calculation even if it is less than one-fourth (
1/4) mile. [45 FR 42500, June 24, 1980, as amended at 46 FR 43161, Aug. 27, 1981; 47 FR 4999, Feb. 3, 1982]
This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.United States CodeU.S. Code: Title 42 - THE PUBLIC HEALTH AND WELFARE§ 300f - Definitions§ 300j-8§ 6901 - Congressional findings§ 6901a - Congressional findings: used oil recycling§ 6902 - Objectives and national policy§ 6903 - Definitions§ 6904 - Governmental cooperation§ 6905 - Application of chapter and integration with other Acts§ 6906 - Financial disclosure§ 6907 - Solid waste management information and guidelines§ 6908 - Small town environmental planning§ 6908a - Agreements with Indian tribes§ 6925 - Permits for treatment, storage, or disposal of hazardous waste§ 6927 - Inspections§ 6974 - Petition for regulations; public participation