[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR146.33]

[Page 779-780]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 146_UNDERGROUND INJECTION CONTROL PROGRAM: CRITERIA AND STANDARDS--Table 
 
     Subpart D_Criteria and Standards Applicable to Class III Wells
 
Sec. 146.33  Operating, monitoring, and reporting requirements.

    (a) Operating requirements. Operating requirements prescribed shall, 
at a minimum, specify that:
    (1) Except during well stimulation injection pressure at the 
wellhead shall be calculated so as to assure that the pressure in the 
injection zone during injection does not initiate new fractures or 
propagate existing fractures in the injection zone. In no case, shall 
injection pressure initiate fractures in the confining zone or cause the 
migration of injection or formation fluids into an underground source of 
drinking water.
    (2) Injection between the outermost casing protecting underground 
sources of drinking water and the well bore is prohibited.
    (b) Monitoring requirements. Monitoring requirements shall, at a 
minimum, specify:
    (1) Monitoring of the nature of injected fluids with sufficient 
frequency to yield representative data on its characteristics. Whenever 
the injection fluid is modified to the extent that the analysis required 
by Sec. 146.34(a)(7)(iii) is incorrect or incomplete, a new analysis as 
required by Sec. 146.34(a)(7)(iii) shall be provided to the Director.
    (2) Monitoring of injection pressure and either flow rate or volume 
semi-monthly, or metering and daily recording of injected and produced 
fluid volumes as appropriate.
    (3) Demonstration of mechanical integrity pursuant to Sec. 146.08 
at least once every five years during the life of the well for salt 
solution mining.
    (4) Monitoring of the fluid level in the injection zone semi-
monthly, where appropriate and monitoring of the parameters chosen to 
measure water quality in the monitoring wells required by Sec. 
146.32(e), semi-monthly.
    (5) Quarterly monitoring of wells required by Sec. 146.32(g).
    (6) All Class III wells may be monitored on a field or project basis 
rather than an individual well basis by manifold monitoring. Manifold 
monitoring may be used in cases of facilities consisting of more than 
one injection well, operating with a common manifold. Separate 
monitoring systems for each well are not required provided the

[[Page 780]]

owner/operator demonstrates that manifold monitoring is comparable to 
individual well monitoring.
    (c) Reporting requirements. Reporting requirements shall, at a 
minimum, include:
    (1) Quarterly reporting to the Director on required monitoring;
    (2) Results of mechanical integrity and any other periodic test 
required by the Director reported with the first regular quarterly 
report after the completion of the test; and
    (3) Monitoring may be reported on a project or field basis rather 
than individual well basis where manifold monitoring is used.

[45 FR 42500, June 24, 1980, as amended at 46 FR 43163, Aug. 27, 1981; 
46 FR 5001, Feb. 3, 1982; 48 FR 31404, July 8, 1983]