Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 24 - Class VI Injection Wells and Facilities Underground Injection Control Program › Section 24-24 - Post-injection Site Care and Site Closure

Current through July 13, 2024
(a) The owner or
				operator of a Class VI well shall prepare, maintain, update on the same
				schedule as the update to the area of review delineation, and comply with a
				plan for postinjection site care and site closure that meets the requirements
				of subparagraph (a)(ii) of this Section and is approved by the Administrator.
(i) The post-injection site care and site
				closure plan is subject to approval by the Administrator in consultation with
				EPA.
(ii) The post-injection site
				care and site closure plan shall include the following information:
(A) A demonstration containing substantial
				evidence that the geologic sequestration project will no longer pose a risk of
				endangerment to USDWs and will not harm or present a risk to human health,
				safety, or the environment at the end of the post-injection site care
				timeframe. The demonstration shall be based on significant, site-specific data
				and information, including all data and information collected pursuant to
				Sections
				10 and
				12 of this Chapter;
(B) The site closure plan shall address all
				reclamation, monitoring, and remediation sufficient to show that the carbon
				dioxide stream injected into the geologic sequestration site will not harm
				human health, safety, the environment, or drinking water supplies;
(C) Detailed plans for post-injection
				monitoring, verification, maintenance, and mitigation;
(D) The pressure differential between
				pre-injection and predicted postinjection pressures in the injection
				zone;
(E) The predicted position of
				the carbon dioxide plume and associated pressure front at the time when plume
				movement has ceased and pressure differentials sufficient to cause the movement
				of injected fluids or formation fluids into a USDW are no longer present, as
				demonstrated in the area of review evaluation required under Section
				13(b)(i) of this
				Chapter;
(F) A description of
				post-injection monitoring locations, methods, and proposed frequency;
(G) A proposed schedule for submitting
				post-injection site care monitoring results pursuant to Section 22(c) of this
				Chapter;
(H) The duration of the
				post-injection site care timeframe that ensures compliance with subparagraph
				(A) of this paragraph;
(I) The
				results of computational modeling performed pursuant to delineation of the area
				of review under Section
				13 of this Chapter;
(J) The predicted timeframe for pressure
				decline:
(I) Within the injection zone and any
				other zones such that formation fluids may not be forced into any USDWs;
				or
(II) To pre-injection
				pressures;
(K) The
				predicted rate of carbon dioxide plume migration within the injection zone, and
				the predicted timeframe for the cessation of migration;
(L) A description of the site-specific
				processes that will result in carbon dioxide trapping including immobilization
				by capillary trapping, dissolution, and mineralization at the site;
(M) The predicted rate of carbon dioxide
				trapping in the immobile capillary phase, dissolved phase, and mineral
				phase;
(N) The results of
				laboratory analyses, research studies, and field or site-specific studies to
				verify the information required in subparagraphs (J) and (K) of this
				paragraph;
(O) A characterization
				of the confining zones including a demonstration that they are free of
				transmissive faults, fractures, and micro-fractures and of appropriate
				thickness, permeability, and integrity to impede fluid (including carbon
				dioxide and formation fluids) movement;
(P) The presence of potential conduits for
				fluid movement, including planned injection wells and project monitoring wells
				associated with the proposed geologic sequestration project or any other
				projects in proximity to the predicted or modeled final extent of the carbon
				dioxide plume and area of elevated pressure;
(Q) A description of the well construction
				and an assessment of the quality of plugs of all abandoned wells within the
				area of review;
(R) The distance
				between the injection zone and the nearest USDWs above and below the injection
				zone; and
(S) Any additional
				site-specific factors required by the Administrator.
(iii) Information submitted to support the
				demonstration in subparagraph (a)(ii) of this Section shall meet the following
				criteria:
(A) All analyses and tests performed
				shall be accurate, reproducible, and performed in accordance with industry
				standards;
(B) Estimation
				techniques shall be appropriate;
(C) EPA-certified test protocols shall be
				used where available;
(D)
				Predictive models shall be appropriate and tailored to the site conditions,
				composition of the carbon dioxide stream and injection, and site conditions
				over the life of the geologic sequestration project;
(E) Predictive models shall be calibrated
				using existing information (which may be obtained from Class I, Class II, Class
				V experimental technology, or Class VI well sites) where sufficient data are
				available;
(F) Reasonably
				conservative values and modeling assumptions shall be used and disclosed to the
				Administrator whenever values are estimated on the basis of known, historical
				information instead of site-specific measurements;
(G) An analysis shall be performed to
				identify and assess aspects of the post-injection site care timeframe
				demonstration that contribute significantly to uncertainty. The owner or
				operator shall conduct sensitivity analyses to determine the effect that
				significant uncertainty may contribute to the modeling demonstration;
(H) An approved quality assurance and quality
				control plan shall address all aspects of the demonstration; and
(I) Any additional criteria required by the
				Administrator shall be met.
(iv) Upon cessation of injection, owners or
				operators of Class VI wells shall either submit an amended post-injection site
				care and site closure plan or demonstrate to the Administrator through
				monitoring data and modeling results that no amendment to the plan is needed.
				Any amendments to the post-injection site care and site closure plan shall be:
(A) Subject to approval by the
				Administrator;
(B) Incorporated
				into the permit; and
(C) Subject to
				the permit modification requirements of Section
				6 of this
				Chapter.
(v) The owner
				or operator may amend the post-injection site care and site closure plan. The
				owner or operator shall re-submit the post-injection site care and closure plan
				for the Administrator's approval within thirty (30) days of amending the
				plan.
(vi) Upon receipt of the
				Administrator's approval of the post-injection site care and site closure plan,
				the owner or operator shall submit the proposed cost estimate for measurement,
				monitoring, and verification of plume stabilization required by Section 26(i)
				of this Chapter.