Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 9 - DEPARTMENT OF ENVIRONMENTAL QUALITY - WATER POLLUTION CONTROL › Article 6 - UNDERGROUND INJECTION CONTROL › Part J - CLASS VI INJECTION WELL REQUIREMENTS › Section R18-9-J670 - Class VI; Injection Depth Waiver Requirements

Current through Register Vol. 30, No. 28, July 12, 2024
A. This Section
				  sets forth information which an owner or operator seeking a waiver of the Class
				  VI injection depth requirements must submit to the Director; information the
				  Director must consider in consultation with all affected Public Water System
				  Supervision Directors; the procedure for Director-- Administrator communication
				  and waiver issuance; and the additional requirements that apply to owners or
				  operators of Class VI wells granted a waiver of the injection depth
				  requirements.
B. In seeking a
				  waiver of the requirement to inject below the lowermost USDW, the owner or
				  operator must submit a supplemental report concurrent with permit application.
				  The supplemental report must include the following:
1. A demonstration that the injection zone or
				  zones is/are laterally continuous, is not a USDW, and is not hydraulically
				  connected to USDWs; does not outcrop; has adequate injectivity, volume, and
				  sufficient porosity to safely contain the injected carbon dioxide and formation
				  fluids; and has appropriate geochemistry.
2. A demonstration that the injection zone or
				  zones is/are bounded by laterally continuous, impermeable confining units above
				  and below the injection zone or zones adequate to prevent fluid movement and
				  pressure buildup outside of the injection zone or zones; and that the confining
				  unit or units is/are free of transmissive faults and fractures. The report
				  shall further characterize the regional fracture properties and contain a
				  demonstration that such fractures will not interfere with injection, serve as
				  conduits, or endanger USDWs.
3. A
				  demonstration, using computational modeling, that USDWs above and below the
				  injection zone will not be endangered as a result of fluid movement. This
				  modeling should be conducted in conjunction with the area of review
				  determination, as described in R18-9-J659, and is subject to requirements, as
				  described in R18-9-J659(C), and periodic reevaluation, as described in
				  R18-9-J659(E).
4. A demonstration
				  that well design and construction, in conjunction with the waiver, will ensure
				  isolation of the injectate in lieu of requirements at R18-9-J661(A)(1) and will
				  meet well construction requirements in subsection (G) of this
				  Section.
5. A description of how
				  the monitoring and testing and any additional plans will be tailored to the
				  geologic sequestration project to ensure protection of USDWs above and below
				  the injection zone or zones, if a waiver is granted.
6. Information on the location of all the
				  public water supplies affected, reasonably likely to be affected, or served by
				  USDWs in the area of review.
7. Any
				  other information requested by the Director to inform the Administrator's
				  decision to issue a waiver.