[Code of Federal Regulations]
[Title 40, Volume 21]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR146.61]

[Page 717]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 146_UNDERGROUND INJECTION CONTROL PROGRAM: CRITERIA AND STANDARDS
--Table of Contents
 
 Subpart G_Criteria and Standards Applicable to Class I Hazardous Waste 
                             Injection Wells
 
Sec. 146.61  Applicability

    Source: 53 FR 28148, July 26, 1988, unless otherwise noted.


    (a) This subpart establishes criteria and standards for underground 
injection control programs to regulate Class I hazardous waste injection 
wells. Unless otherwise noted this subpart supplements the requirements 
of subpart A and applies instead of subpart B to Class I hazardous waste 
injection wells.
    (b) Definitions.
    Cone of influence means that area around the well within which 
increased injection zone pressures caused by injection into the 
hazardous waste injection well would be sufficient to drive fluids into 
an underground source of drinking water (USDW).
    Existing well means a Class I well which was authorized prior to 
August 25, 1988, by an approved State program, or an EPA-administered 
program or a well which has become a Class I well as a result of a 
change in the definition of the injected waste which would render the 
waste hazardous under Sec. 261.3 of this part.
    Injection interval means that part of the injection zone in which 
the well is screened, or in which the waste is otherwise directly 
emplaced.
    New well means any Class I hazardous waste injection well which is 
not an existing well.
    Transmissive fault or fracture is a fault or fracture that has 
sufficient permeability and vertical extent to allow fluids to move 
between formations.

[[Page 718]]