£EPA
United States
Environmental Protection
Agency
Geologic Sequestration
of Carbon Dioxide
Underground Injection
Control (UIC) Program
Class VI Well Project Plan
Development Guidance
August 2012
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Office of Water (4606M)
EPA 816-R-l 1-017
August 2012
http://water.epa. gov/drink
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Disclaimer
The Federal Requirements Under the Underground Injection Control Program for Carbon
Dioxide Geologic Sequestration Wells (75 FR 77230, December 10, 2010), known as the Class
VI Rule, establishes a new class of injection well (Class VI).
The Safe Drinking Water Act (SDWA) provisions and EPA regulations cited in this document
contain legally-binding requirements. In several chapters this guidance document makes
suggestions and offers alternatives that go beyond the minimum requirements indicated by the
Class VI Rule. This is done to provide information and suggestions that may be helpful for
implementation efforts. Such suggestions are prefaced by "may" or "should" and are to be
considered advisory. They are not required elements of the Rule. Therefore, this document does
not substitute for those provisions or regulations, nor is it a regulation itself, so it does not
impose legally-binding requirements on EPA, states, or the regulated community. The
recommendations herein may not be applicable to each and every situation.
EPA and state decision makers retain the discretion to adopt approaches on a case-by-case basis
that differ from this guidance where appropriate. Any decisions regarding a particular facility
will be made based on the applicable statutes and regulations. Mention of trade names or
commercial products does not constitute endorsement or recommendation for use. EPA is taking
an adaptive rulemaking approach to regulating Class VI injection wells, and the Agency will
continue to evaluate ongoing research and demonstration projects and gather other relevant
information as needed to refine the Rule. Consequently, this guidance may change in the future
without public notice.
While EPA has made every effort to ensure the accuracy of the discussion in this document, the
obligations of the regulated community are determined by statutes, regulations or other legally
binding requirements. In the event of a conflict between the discussion in this document and any
statute or regulation, this document would not be controlling.
Note that this document only addresses issues covered by EPA's authorities under the SDWA.
Other EPA authorities, such as Clean Air Act (CAA) requirements to report carbon dioxide
injection activities under the Greenhouse Gas Mandatory Reporting Rule (GHG MRR) are not
within the scope of this document.
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Executive Summary
The United States Environmental Protection Agency's (EPA's) Federal Requirements Under the
Underground Injection Control (UIC) Program for Carbon Dioxide Geologic Sequestration
Wells, codified in the U.S. Code of Federal Regulations [40 CFR 146.81 etseq.], referred to as
the Class VI Rule, establishes a new class of injection well (Class VI) and sets minimum federal
technical criteria for Class VI injection wells for the purpose of protecting underground sources
of drinking water (USDWs). This document is part of a series of technical guidance documents
that EPA is developing to support owners or operators of Class VI wells and permitting
authorities. The final Class VI Rule and associated guidance documents are available at
http://water.epa.gov/type/groundwater/uic/wells_sequestration.cfm.
The Class VI Rule requires owners or operators of Class VI wells to develop, gain approval for,
and implement five (5) project-specific plans, including: an Area of Review (AoR) and
Corrective Action Plan, a Testing and Monitoring Plan, an Injection Well Plugging Plan, a Post-
Injection Site Care (PISC) and Site Closure Plan, and an Emergency and Remedial Response
Plan.
This guidance describes, for Class VI injection well owners or operators, the required elements
of each plan and the site-specific elements of each GS project that may be considered when
developing the plans. This document also describes the process by which the UIC Program
Director will evaluate and approve each plan and how EPA recommends that the plans be
reviewed and amended, if necessary, throughout the lifecycle of the project.
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Table of Contents
Disclaimer ii
Executive Summary iii
Table of Contents iv
List of Tables vi
List of Exhibits vi
List of Appendices vii
Acronyms and Abbreviations viii
Definitions ix
1.0 Introduction 1
1.1 Overview and Need for GS Project Plans 1
1.2 Interaction of GS Project Plans 4
1.3 Other Relevant Guidance 8
1.4 Organization of this Document 9
2.0 Area of Review and Corrective Action Plan 10
2.1 Developing the AoRand Corrective Action Plan 10
2.1.1 The method for delineating the AoR 11
2.1.2 The minimum fixed frequency to reevaluate the AoR 13
2.1.3 Conditions that would warrant an early AoR reevaluation 14
2.1.4 How monitoring and operational data will inform AoR reevaluations 14
2.1.5 How corrective action will be conducted 15
2.2 UIC Program Director's Evaluation of the AoRand Corrective Action Plan 19
2.3 Amending the AoRand Corrective Action Plan 21
3.0 Testing and Monitoring Plan 23
3.1 Developing the Testing and Monitoring Plan 24
3.1.1 Analysis of the carbon dioxide stream 25
3.1.2 Installation and use of continuous recording devices 26
3.1.3 Corrosion monitoring 26
3.1.4 Ground water quality monitoring 27
3.1.5 A demonstration of external mechanical integrity 31
3.1.6 A pressure fall-off test 32
3.1.7 Carbon dioxide plume and pressure front tracking 32
3.1.8 Surface air and/or soil gas monitoring (if required) 33
3.1.9 Any additional monitoring required by the UIC Program Director 35
3.2 UIC Program Director's Evaluation of the Testing and Monitoring Plan 35
3.3 Amending the Testing and Monitoring Plan 36
4.0 Injection Well Plugging Plan 39
4.1 Developing the Injection Well Plugging Plan 39
4.2 UIC Program Director's Evaluation of the Injection Well Plugging Plan 41
4.3 Amending the Injection Well Plugging Plan 42
5.0 Post-Injection Site Care (PISC) and Site Closure Plan 43
5.1 Developing the Post-Injection Site Care and Site Closure Plan 44
5.1.1 Pre-injection and predicted post-injection pressure differentials in the injection zone 44
5.1.2 Predicted position of the carbon dioxide plume and pressure front at site closure 45
5.1.3 Monitoring location, methods, and proposed frequency 45
5.1.4 Schedule for submitting post-injection site care monitoring results 46
5.1.5 Demonstration of an alternative post-injection site care timeframe 46
5.1.6 Information that will Support the Non-Endangerment Demonstration 47
5.1.7 Site Closure Plan 47
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5.2 UIC Program Director's Evaluation of the Post-Injection Site Care and Site Closure Plan 48
5.3 Amending the Post-Injection Site Care and Site Closure Plan 49
6.0 Emergency and Remedial Response Plan 51
6.1 Developing the Emergency and Remedial Response Plan 52
6.2 UIC Program Director's Evaluation of the Emergency and Remedial Re sponse Plan 55
6.3 Amending the Emergency and Remedial Response Plan 56
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List of Tables
Table 1: Examples of Interaction of GS Project Plans 7
List of Exhibits
Exhibit 1: Process for Developing, Approving, and Amending GS Proj ect Plans 3
Exhibit 2: Draft UIC Program Class VI Well AoR Evaluation and Corrective Action Guidance
Highlights 11
Exhibit 3: Draft UIC Program Class VI Well Testing and Monitoring Guidance Highlights 25
Exhibit 4: Draft UIC Program Class VI Well Plugging, PISC, and Site Closure Guidance
Highlights 40
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List of Appendices
Appendix A: Sample Template of an Area of Review and Corrective Action Plan
Appendix B: Sample Template of a Testing and Monitoring Plan
Appendix C: Sample Template of an Injection Well Plugging Plan
Appendix D: Sample Template of a PISC and Site Closure Plan
Appendix E: Sample Template of an Emergency and Remedial Response Plan
Appendix F: Checklist of Recommended Considerations for Evaluating Plans and Amendments
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Acronyms and Abbreviations
AoR Area of Review
CFR Code of Federal Regulations
GS Geologic Sequestration
MIT Mechanical Integrity Test
PISC Post-injection Site Care
pH Potential for Hydrogen Ion Concentration
SC Specific Conductivity
SDWA Safe Drinking Water Act
TDS Total Dissolved Solids
UIC Underground Injection Control
USDW Underground Source of Drinking Water
VOC Volatile Organic Compound
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Definitions
Key to definition sources:
1: This definition was drafted for the purposes of this document.
2:40CFR146.81(d).
3: 40 CFR 144.6(f) and 144.80(f).
4: Class VI Rule preamble.
5: EPA's UIC website (http://water.epa.gov/type/groundwater/uic/glossary.cfm).
Analyte means a chemical species that is the subject of analysis for determination of
concentration.1
Area of Review means the region surrounding the geologic sequestration project where USDWs
may be endangered by the injection activity. The area of review is delineated using
computational modeling that accounts for the physical and chemical properties of all phases of
the injected carbon dioxide stream and displaced fluids, and is based on available site
characterization, monitoring, and operational data as set forth in 40 CFR 146.84.2
Carbon dioxide plume means the extent underground, in three dimensions, of an injected
carbon dioxide stream.2
Carbon dioxide stream means carbon dioxide that has been captured from an emission source
(e.g., a power plant), plus incidental associated substances derived from the source materials and
the capture process, and any substances added to the stream to enable or improve the injection
process. This does not apply to any carbon dioxide stream that meets the definition of a
hazardous waste under 40 CFR Part 261.2
Class VI wells means wells that are not experimental in nature that are used for geologic
sequestration of carbon dioxide beneath the lowermost formation containing a USDW; or, wells
used for geologic sequestration of carbon dioxide that have been granted a waiver of the
injection depth requirements pursuant to requirements at 40 CFR 146.95; or, wells used for
geologic sequestration of carbon dioxide that have received an expansion to the areal extent of an
existing Class II enhanced oil recovery or enhanced gas recovery aquifer exemption pursuant to
40 CFR 146.4 and 144.7(d).3
Confining zone means a geologic formation, group of formations, or part of a formation
stratigraphically overlying the injection zone(s) that acts as a barrier to fluid movement. For
Class VI wells operating under an injection depth waiver, confining zone means a geologic
formation, group of formations, or part of a formation stratigraphically overlying and underlying
the injection zone.
Corrective action means the use of Director-approved methods to ensure that wells within the
area of review do not serve as conduits for the movement of fluids into underground sources of
drinking water.2
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Geologic sequestration means the long-term containment of a gaseous, liquid, or supercritical
carbon dioxide stream in subsurface geologic formations. This term does not apply to carbon
dioxide capture or transport.2
Geologic sequestration project means an injection well or wells used to emplace a carbon
dioxide stream beneath the lowermost formation containing a USDW; or, wells used for geologic
sequestration of carbon dioxide that have been granted a waiver of the injection depth
requirements pursuant to requirements at 40 CFR 146.95; or, wells used for geologic
sequestration of carbon dioxide that have received an expansion to the areal extent of an existing
Class II enhanced oil recovery or enhanced gas recovery aquifer exemption pursuant to 40 CFR
146.4 and 144.7(d). It includes the subsurface three-dimensional extent of the carbon dioxide
plume, associated area of elevated pressure, and displaced fluids, as well as the surface area
above that delineated region.
Injection depth waivers refer to the provisions at 40 CFR 146.95 that allow owners or operators
to seek a waiver from the Class VI injection depth requirements for GS to allow injection into
non-USDW formations while ensuring that USDWs are protected from endangerment.l
Mechanical integrity means the absence of significant leakage within the injection tubing,
casing, or packer (known as internal mechanical integrity), or outside of the casing (known as
external mechanical integrity).4
Mechanical integrity test refers to a test performed on a well to confirm that a well maintains
internal and external mechanical integrity. MITs are a means of measuring the adequacy of the
construction of an injection well and a way to detect problems within the well system.4
Multiphase flow parameters refer to model parameters that describe the rate of fluid flow and
fluid saturation for multiple immiscible fluids within a porous medium.1
Phased corrective action refers to a provision of the Class VI Rule [40 CFR 146.84(b)(2)(iv)]
afforded to Class VI well owners or operators to defer some corrective action needed within the
AoR, but farther away from the injection well, until after injection has commenced, but prior to
carbon dioxide plume and pressure front movement into that particular area.1
Post-injection site care means appropriate monitoring and other actions (including corrective
action) needed following cessation of injection to ensure that USDWs are not endangered, as
required under 40 CFR146.93.2
Pressure front means the zone of elevated pressure that is created by the injection of carbon
dioxide into the subsurface. For [GS projects], the pressure front of a carbon dioxide plume
refers to a zone where there is a pressure differential sufficient to cause the movement of injected
fluids or formation fluids into a USDW.
Site closure means the point/time, as determined by the Director following the requirements
under 40 CFR 146.93, at which the owner or operator of a geologic sequestration site is released
from post-injection site care responsibilities.2
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Stochastic estimate means a type of modeling prediction that is based on a statistically
generated representation of key model input parameters.1
Underground Injection Control Program refers to the program EPA, or an approved state, is
authorized to implement under the Safe Drinking Water Act (SDWA) that is responsible for
regulating the underground injection of fluids by wells injection. This includes setting the federal
minimum requirements for construction, operation, permitting, and closure of underground
injection wells.1
Underground Injection Control Program Director refers to the chief administrative officer of
any state or tribal agency or EPA Region that has been delegated to operate an approved UIC
program.5
Underground Source of Drinking Water means an aquifer or portion of an aquifer that
supplies any public water system or that contains a sufficient quantity of ground water to supply
a public water system, and currently supplies drinking water for human consumption, or that
contains fewer than 10,000 mg/L total dissolved solids and is not an exempted aquifer.4
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1.0 Introduction
Owners or operators of Class VI carbon dioxide injection wells must develop, implement,
periodically review and, if necessary, amend a series of project- and site-specific plans that guide
the management of each geologic sequestration (GS) project. The purpose of this Project Plan
Development Guidance is to present recommendations for Class VI injection well owners or
operators, in developing the project plans required in the Federal Requirements Under the
Underground Injection Control (UIC) Program for Carbon Dioxide Geologic Sequestration
Wells [40 CFR 146.81 et seq.], hereafter referred to as the Class VI Rule. This guidance focuses
on preparing GS project plans that meet the requirements of the Class VI Rule, submitting them
to the appropriate UIC Program Director for approval, and periodically reviewing and amending
the plans.
1.1 Overview and Need for GS Project Plans
Owners or operators of Class VI wells must prepare five (5) project plans and submit them to the
UIC Program Director for approval with their Class VI permit application. When the plans are
approved, they become an enforceable part of the Class VI permit. The required project plans,
which must be based on site-specific information, include the following:
Area of Review (AoR) and Corrective Action Plan. This plan describes how an owner or
operator intends to delineate the AoR for the Class VI injection well and ensure that all
identified deficient artificial penetrations (i.e., wells that are improperly plugged or
completed) will be addressed by corrective action techniques so that they will not become
conduits for fluid movement into underground sources of drinking water (USDWs).
Testing and Monitoring Plan. This plan describes how the owner or operator intends to
perform all necessary testing and monitoring associated with a GS project, including injectate
monitoring, performing mechanical integrity tests (MITs), corrosion monitoring, tracking the
carbon dioxide plume and area of elevated pressure, monitoring geochemical changes above
the confining zone, and, at the discretion of the UIC Program Director, surface air and/or soil
gas monitoring for carbon dioxide fluctuations and any additional tests necessary to ensure
USDW protection from endangerment.
Injection Well Plugging Plan. This plan describes how, following the cessation of injection,
the owner or operator intends to plug the Class VI injection well using the appropriate
materials and methods to ensure that the well will not become a conduit for fluid movement
into USDWs in the future.
Post-Injection Site Care (PISC) and Site Closure Plan This plan describes how the owner
or operator intends to monitor the site after injection has ceased, in order to ensure that the
carbon dioxide plume and pressure front are moving as predicted and USDWs are not
endangered. PISC monitoring must continue until it can be demonstrated that the site poses
no further endangerment to USDWs.
Emergency and Remedial Response Plan. This plan describes the actions that the owner or
operator intends to take in the event of movement of the injectate or formation fluids in a
manner that may cause an endangerment to a USDW, including the appropriate people to
contact.
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These detailed, site-specific GS project plans are necessary to ensure that management of the GS
project is based on the most up-to-date site characterization, modeling, operational, and
monitoring data to protect USDWs from endangerment. The plans also afford the flexibility
needed to address the variety of types of geologic formations in which GS will occur, while also
facilitating dialogue between the Class VI injection well owner or operator and the UIC Program
Director.
Class VI well permits are issued for the operating life of the project (i.e., from authorization of
injection through site closure, which may occur many decades later). Thus, unlike some other
injection well classes regulated under the UIC Program, there is no periodic reapplication for, or
reissuance of, a Class VI permit. Instead, these five GS project plans, which are reviewed as part
of the Class VI permit application review and approval process and incorporated into the Class
VI permit, must be amended periodically, as specified in the Class VI Rule. The iterative process
of developing and executing the GS project plans described in this guidance is tailored to the
unique aspects of GS and is intended to ensure that time and resources are committed to the most
critical aspects of managing Class VI injection well operations (see Exhibit 1).
The project plans must be submitted with the permit application for each Class VI well. While
area permits are not an option for permitting of Class VI wells per 40 CFR 144.33(a)(5), owners
or operators can realize some efficiencies in developing and implementing project plans where
certain aspects of multiple wells in an area are common. For example, owners or operators may
develop Testing and Monitoring Plans or PISC and Site Closure Plans that include ground water
monitoring or carbon dioxide plume and pressure front tracking over an area that would satisfy
the requirements for several permits simultaneously. Additionally, if several wells in a field have
similar construction, owners or operators may plan to plug each well in a similar manner;
however, a separate Injection Well Plugging Plan is required for each well (i.e., tailored to its
depth and any other unique characteristics of the well).
In addition to providing permitting efficiency, collectively considering all wells in a field will
ensure that the site is evaluated and operated in a holistic manner and that all aspects of the
project that may impact USDWs have been evaluated and addressed. The owner or operator
should discuss the implications of combining common elements and activities associated with
multiple wells/permits with the UIC Program Director to ensure that every well is constructed,
operated, monitored, plugged, and closed in a manner that is protective of USDWs.
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Exhibit 1: Process for Developing, Approving, and Amending GS Project Plans
Permitting
Collect
geologic
data
Operation
Discussions
Collect injection
and monitoring
data
operator
develops plans
Revise
if needed
Revisions
Director
issues Class
VI permit
Owner/
operator
drills well
(finalizes plans
if needed)
T
Director
authorizes
injection
If amendment
is needed
Post-Injection
Cease injection;
notify of intent
to plug well*
Review AoR,
Plugging,
PISC, and ERR
plans
Plug well;*
do PISC monitoring
(per approved plan)
Review
AoR, PISC, and
ERR plans
Director
authorizes
site closure
Update
if needed
(Director
approval
required)
Update
if needed
(Director
approval
required)
Key:
Owner/operator
activities
"'Owners or operators may choose to keep the injection well open as
a monitoring well; see the Draft UIC Program Class VI Well Plugging,
PISC, and Site Closure Guidance for additional information.
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1.2 Interaction of GS Project Plans
Development, approval, and implementation of the project-specific plans involve an iterative
process. Exhibit 1 presents a general overview of the process of gathering data for, developing,
approving, and periodically reviewing and amending the plans throughout the life of a GS
project. Note that this Exhibit is a conceptual overview only and may not capture all of the
permutations of activities or the order in which they may happen at every GS project. The
Sections below describe this process in greater detail.
Pre-Operatiom Development of the GS Project Plans
Before a Class VI permit may be issued, the owner or operator must develop and obtain the UIC
Program Director's approval of each of the five project plans. The initial plans are to be based on
the extensive site-specific data collected during site characterization (e.g., geologic and
geochemical data on subsurface formations and hydrologic data on aquifers), preliminary
predictions of plume movement and pressure perturbations, and planned operational conditions.
See the Draft UIC Program Class VI Well Site Characterization Guidance at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm for additional information on
the types and collection of required site-specific data.
Owners or operators must submit the five proposed GS project plans with their Class VI permit
application. The UIC Program Director should evaluate the proposed plans in the context of
other geologic and operational data submitted with the Class VI permit application. The owner or
operator and the UIC Program Director are encouraged to discuss the plans as they are written
and evaluated (especially while site-specific data are being collected). This coordination can
improve the likelihood that the proposed plans will be approved and help both the owner or
operator and the UIC Program Director anticipate any issues related to the operation of a GS
project that may be of concern to the public.
EPA recommends that owners or operators consider revising or adjusting portions of the project
plans as additional data become available during the site characterization process. All five of the
project plans must be submitted with the Class VI permit application, i.e., prior to operation of
the injection well or drilling of any test wells. (While a stratigraphic test well that is not an
injection well does not require a Class VI permit, if drilling one is planned, EPA recommends
that the owner or operator and UIC Program Director discuss this to ensure that all planned
activities associated with the test well would support an approvable Class VI permit application.)
Therefore, the owner or operator will need to develop the plans prior to the formal modeling of
the AoR.
While certain preliminary information would be available prior to AoR modeling, e.g., the
estimated extent of the AoR based on initial geologic data and planned injection volumes, EPA
recommends that the owner or operator revisit and revise the operational-phase plans (e.g., the
AoR and Corrective Action Plan, Testing and Monitoring Plan, and Emergency and Remedial
Response Plan) as necessary once the AoR modeling has been completed. This would, for
example, help ensure that the AoR and Corrective Action Plan addresses all improperly
abandoned artificial penetrations throughout the delineated AoR, that planned testing and
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monitoring is thorough, or that the Emergency and Remedial Response Plan addresses all
potential resources and infrastructure that may be impacted by the project.
Unless the site characterization or pre-injection testing revealed information about the site that is
significantly different than the data on which the plans were based, fmalization of the plans
should not entail major revisions to the plans; instead, EPA anticipates that only slight
adjustments to the plans would be needed to incorporate the latest available information about
the site. However, if the AoR or any of the project plans require significant changes based on the
final site characterization data, the permit would have to be modified. Depending on the extent of
the modifications, the UIC Program Director may need to re-initiate the public notice process. To
avoid any potential delays associated with this, EPA encourages owners or operators to collect as
much site-specific data as possible before submitting the initial Class VI permit application.
In their discussion of the plans, EPA recommends that the owner or operator and UIC Program
Director consider the advantages of tailoring activities to project conditions, and not necessarily
performing only the minimum activities required by the Class VI Rule. For example, increasing
the number of monitoring locations or the frequency of AoR reevaluations may help ensure that
future reviews of the project plans will not necessitate amendments or permit modifications.
Owners or operators planning to deploy certain technologies several years into the life of the
injection project (e.g., bringing additional monitoring wells online) may want to consider
building the deployment schedule into the appropriate project plan so that adding or modifying a
technique would not necessitate a permit modification (see below). This type of proactive
planning early in the process may help ensure that the owner or operator and the UIC Program
Director have considered both the current and possible future conditions at the proposed Class VI
injection well site based on all available site-specific information.
Plan Reviews and Amendments
Throughout the operational (injection) phase of a GS project, owners or operators will collect
operating data (e.g., injection pressures, volumes, rates) and monitoring data (e.g., the position of
the carbon dioxide plume and pressure front, ground water quality data). In addition to verifying
that the site is operating as planned/modeled, this data will inform reevaluations of the AoR [40
CFR 146.84(e)] and any subsequent project plan revisions and amendments.
The AoR reevaluation involves the comparison of recently collected monitoring data to earlier
model predictions, which must take place at least every five (5) years [40 CFR 146.84]. Based on
these comparisons, the AoR delineation model may need to be modified or run again in order to
incorporate additional monitoring, site characterization, or operational data. Within one (1) year
of an AoR reevaluation, the owner or operator must review the AoR and Corrective Action Plan,
Testing and Monitoring Plan, and the Emergency and Remedial Response Plan, and determine if
any amendments are necessary.
Following this project plan review, the owner or operator must either submit amended project
plans to the UIC Program Director or submit information that demonstrates why no amendments
to the project plans are needed. Amended project plans must be subsequently approved by the
UIC Program Director. (Periodic amendments of the Injection Well Plugging Plan and the PISC
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and Site Closure Plan are not required throughout the operational phase of the project because
these plans would not be implemented until the cessation of injection operations.)
The amended plans would then be incorporated into the Class VI operating permit, which would
constitute a modification of the permit. Unless the modification to the permit is a minor
modification (as defined at 40 CFR 144.41), a draft modified permit must be prepared and the
procedures specified in 40 CFR Part 124 (public participation) must be followed. For additional
information regarding the procedures that must be followed for a Class VI permit modification,
see 40 CFR 144.39, as well as the Draft UIC Program Class VIImplementation Manual.
The five GS project plans are inter-related. Changes to (or information acquired through the
implementation of) one plan may necessitate a review of, or possibly a change to, some or all of
the other plans. For example, data collected pursuant to the approved Testing and Monitoring
Plan will inform the AoR reevaluation, which may, in turn, indicate that a revision of the
Emergency and Remedial Response plan is needed. Plan reviews and amendments may also be
triggered if there are indications based on monitoring data (collected per the approved Testing
and Monitoring Plan) that the site is not performing as predicted. Table 1 presents examples of
how, in the course of implementing one plan, changes may be identified that trigger the need for
review ofand possible amendments tothe other project plans associated with a GS project.
Note that the list presented in Table 1 is not intended to be exhaustive.
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Table 1. Examples of Interaction of Class VI Injection Well Project Plans
Plan
AoR and Corrective
Action Plan
Testing and
Monitoring Plan
PISC and Site Closure
Plan
Emergency and
Remedial Response
Plan
Changes identified in
implementing the plan
Revised modeling delineates a
larger/differently shaped AoR
Ground water monitoring
indicates leaching/mobilization
of toxic metals or organics
Monitoring detects impairment
ofaUSDW
Monitoring indicates the
carbon dioxide plume is
moving faster than predicted,
or in a different direction
Pressures within the injection
zone vary from modeled
predictions
Monitoring detects ground
water contamination or plume
excursions
An adverse event required
implementation of Emergency
and Remedial Response Plan
Potential impacts on other plans
Amend the AoR and Corrective Action Plan
to address newly identified deficient wells
Add monitoring locations to the Testing and
Monitoring Plan
Revise the Emergency and Remedial
Response Plan if new resources/
infrastructure are identified in the AoR
Adjust corrective action methods to address
water quality changes
Adjust injection well plugging methods
Modify operational and post-injection
ground water monitoring
Implement the Emergency and Remedial
Response Plan
Modify operational and post-injection
ground water monitoring
Adjust corrective action schedule; conduct
more frequent AoR reevaluations
Expand ground water monitoring/pressure
monitoring network
Adjust post-injection pressure monitoring
Reevaluate AoR, considering current
pressure data
Revise AoR and Corrective Action Plan
Implement Emergency and Remedial
Response Plan
Modify post-injection monitoring regime
Revisit all plans to identify lessons learned
A detailed and thorough periodic reevaluation of the AoR, and the review and applicable
revisions of the project plans throughout the life of the project are key components of the Class
VI Rule. EPA recommends that the plans be reviewed simultaneously to promote a holistic
approach that considers all available information and ensures that the site is managed in a
manner that protects USDWs from endangerment. This iterative plan review and revision
process is unique in the UIC Program for Class VI wells, and it is required in place of the
periodic permit renewals conducted for other injection well classes regulated under the UIC
Program. Linking GS project plan reviews to the AoR reevaluation frequency will ensure that
these reviews are conducted on a defined schedule (i.e., no less than every five [5] years). This
adds little burden on the Class VI injection well owner or operator if the AoR reevaluation
confirms that the project plans are appropriate and can continue to be implemented as written.
There are reasons other than the AoR reevaluation to update project plans. For example, it may
be necessary to review the project plans outside of the AoR reevaluation cycle, and owners or
operators should consider updating their GS project plans whenever monitoring or operational
data indicate such a need. Owners or operators may also consider planning for more frequent
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reevaluations or project plan reviews early in the project life, when unexpected results are most
likely to arise. While it is possible that fewer unanticipated events would occur in the later years
of injection, owners or operators must reevaluate the AoR and determine whether updates to the
plans are needed at least every five (5) years, as required at 40 CFR 146.84(e).
1.3 Other Relevant Guidance
Other Draft UIC Program Class VI guidance documents prepared by EPA on specific technical
aspects of GS projects provide additional, more technically detailed information on the activities
to be included in the GS project plans than is provided in this guidance. The Draft UIC Program
Class VI guidance documents can be found on EPA's website at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm:
The Draft UIC Program Class VI Well Area of Review Evaluation and Corrective
Action Guidance: This draft guidance document describes recommended approaches to
apply computational modeling to delineate the AoR, perform corrective action at GS sites,
and periodically reevaluate the AoR. It contains information that will support the
development of the AoR and Corrective Action Plan for a proposed GS project.
The Draft UIC Program Class VI Well Testing and Monitoring Guidance: This draft
guidance document describes the available technologies for implementing a Testing and
Monitoring Plan for a Class VI injection well site, including well testing such as MITs and
corrosion monitoring, groundwater quality monitoring, carbon dioxide plume and pressure
front tracking, and surface air and/or soil gas monitoring (which may be required by the UIC
Program Director). It contains information that will support the development of the required
Testing and Monitoring Plan for a proposed GS project.
The Draft UIC Program Class VI Well Plugging, Post Injection Site Care (PISC) and
Site Closure Guidance: This draft guidance document describes how EPA recommends that
owners or operators plug injection and monitoring wells, and perform post-injection
monitoring, non-endangerment demonstrations, and site closure activities. It contains
information that will support the development of the required Injection Well Plugging Plan
and the PISC and Site Closure Plan and explains how owners or operators can demonstrate
that an alternative PISC timeframe is appropriate.
Additionally, three other Agency guidance documents address topics related to the development
or submittal of the GS project plans:
The UIC Program Class VI Financial Responsibility Guidance explains the requirements
related to demonstrating and maintaining financial responsibility for corrective action on
wells in the AoR, injection well plugging, PISC and site closure, and emergency and
remedial response at 40 CFR 146.85. Since many of these activities will be performed
pursuant to UIC Program Director-approved GS project plans, the coordination of activities
associated with demonstrating financial responsibility and developing the project plans is
crucial so that cost estimates for financial responsibility demonstrations accurately address
all the covered injection well operation, monitoring, and post-injection activities. EPA
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recommends that the financial responsibility demonstration requirements be considered
throughout the development, implementation, and future amendments to the GS project
plans.
The Draft UIC Class VI Implementation Manual provides recommendations for UIC
Program Directors as they consider various types of information about the site when
evaluating and approving the project plans, including areas on which the UIC Program
Director is afforded discretion in setting permit criteria or reviewing the project plans.
The Draft UIC Program Class VI Well Recordkeeping, Reporting, and Data
Management Guidance provides detailed information for owners or operators on how to
submit all required data for a permitted Class VI injection well, including how to submit the
five project plans and any necessary amendments.
Other EPA-developed guidance documents available to assist owners or operators of Class VI
wells address: the site characterization process, well construction, injection depth waivers for
Class VI wells, and transitioning wells from Class II to Class VI.
1.4 Organization of this Document
The next five Sections of this guidance describe each of the five GS project-specific plans as
follows:
Section 2 - AoR and Corrective Action Plan
Section 3 - Testing and Monitoring Plan
Section 4 - Injection Well Plugging Plan
Section 5 - Post-Injection Site Care and Site Closure Plan
Section 6 - Emergency and Remedial Response Plan
For each of the required plans, the following is described:
Developing the plan (Sections 2.1, 3.1, 4.1, 5.1, and 6.1): these Sections describe the required
content of the plan as specified in the Class VI Rule, recommended approaches for
developing plans that meet EPA's requirements, and the site-specific considerations that EPA
recommends owners or operators account for in developing each plan.
UIC Program Director's evaluation of the plan (Sections 2.2, 3.2, 4.2, 5.2, and 6.2): these
Sections describefor the benefit of the owner or operatorwhat the UIC Program Director
should consider and evaluate as he/she reviews the proposed plan, including any areas of
UIC Program Director's discretion regarding the Class VI Rule requirements.
Amending the plan (Sections 2.3, 3.3, 4.3, 5.3, and 6.3): these Sections describe the
recommended scope of the periodic review of each plan and information that EPA
recommends to be considered in the course of the review, the timing of the review, and what
must be reported to the UIC Program Director [40 CFR 146.84(e), 146.90(j), 146.92(c),
146.93(a)(3), and 146.94(d)].
Appendices A through E contain sample templates for each of the required project plans.
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Note that each Section of this guidance provides a thorough discussion of the process for
development, evaluation, and review/amendment of each of the required plans. Therefore, there
is some repetition when the processes are the same for the different plans. Each Section of this
Plan Development guidance is intended to serve as a "how to" manual for each individual plan.
2.0 Area of Review and Corrective Action Plan
Owners or operators of Class VI injection wells must submit a Class VI Area of Review (AoR)
and Corrective Action Plan that describes how they intend to delineate the AoR (using
appropriate models and assumptions), address all deficient artificial penetrations within the AoR,
and update the AoR modeling periodically throughout the life of the project. This comprehensive
planning is necessary to ensure that an appropriate site-specific strategy is in place to predict the
extent of the carbon dioxide plume and pressure front (i.e., to delineate the AoR) and ensure that
all deficient artificial penetrations within the AoR that could serve as conduits for fluid
movement into USDWs are addressed through appropriate and timely corrective action methods.
Implementation of the AoR and Corrective Action Plan also supports the development of
effective monitoring strategies by identifying the locations where ground water quality or
pressure monitoring should be performed. Additionally, data gathered by implementing the AoR
and Corrective Action Plan will help direct emergency response planning by identifying potential
vulnerable areas (e.g., public water supplies) within the AoR that could require consideration
when implementing an emergency response. AoR and Corrective Action Plans will also guide
the ongoing process of periodic AoR reevaluations, which are essential to informed site
management and monitoring over the lifecycle of the injection project.
2.1 Developing the AoR and Corrective Action Plan
The Class VI Rule, at 40 CFR 146.84(b), presents the required content of an AoR and Corrective
Action Plan for a GS project. In the proposed AoR and Corrective Action Plan, the owner or
operator must demonstrate to the satisfaction of the UIC Program Director that the modeled AoR
will be based on the detailed site-specific geologic data collected during the site characterization
process and that all necessary corrective action within the modeled AoR will be performed in a
timely manner to protect USDWs.
Guidance and recommended approaches on performing the activities to be carried out under the
approved plan (e.g., performing AoR delineation modeling and addressing wells that require
corrective action) are presented in the Draft UIC Program Class VI Well Area of Review
Evaluation and Corrective Action Guidance, available on EPA's website at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm. Exhibit 2 presents highlights
of the information presented in that guidance.
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Exhibit 2: Draft DIG Program Class VI Well AoR Evaluation and Corrective Action
Guidance Highlights
The Draft UIC Program Class VI Well Area of Review Evaluation and Corrective Action Guidance provides EPA
recommendations regarding modeling to delineate the AoR for a GS project, under what circumstances the AoR is
reevaluated, and performing AoR reevaluations. In addition, the guidance covers recommended approaches to
identify, evaluate, and perform corrective action on any artificial penetrations identified within the delineated AoR
that require remediation.
The introductory Section reviews the definition of the AoR for Class VI projects and Class VI regulations pertaining
to AoR and corrective action. Remaining Sections of the guidance address the following topics:
The data to be considered in running a model for the initial AoR delineation;
The computational modeling needed to delineate the AoR;
The identification and evaluation of, and performing corrective action on, artificial penetrations located within
the delineated AoR; and
AoR reevaluations.
For each Section, the guidance:
Explains how to perform activities necessary to comply with the Class VI Rule AoR and corrective action
requirements (e.g., performing computational modeling). Illustrative examples are provided in several cases.
Provides references to other, more comprehensive documents and published scientific literature for further
information.
Explains how and when to report to the UIC Program Director the results of activities related to AoR and
corrective action.
The AoR and Corrective Action Plan must be submitted with the Class VI permit application for
approval by the UIC Program Director [40 CFR 146.82(a)(13)], and must include a description
of how the owner or operator will meet the Class VI AoR and corrective action requirements [40
CFR 146.84]. The Sections below provide a description of the required content of the AoR and
Corrective Action Plan, how EPA recommends the content be described in the plan to
demonstrate that the plan is sufficient and approvable, and other topics that Class VI injection
well owners or operators might consider as they develop their plan. Appendix A of this guidance
document presents a sample template of an AoR and Corrective Action Plan.
2.1.1 The method for delineating the AoR
The Class VI Rule requires Class VI injection well owners or operators to describe in their AoR
and Corrective Action Plan how they will delineate the AoR. Specifically, the plan must describe
the computational model that will be used for the AoR delineation process, the assumptions that
will be made, and the site characterization data on which the model will be based [40 CFR
146.84(b)(l)].
Several computational codes are available that are appropriate for modeling to delineate the AoR
for Class VI wells. EPA recommends that the model be appropriate to the site-specific geologic
conditions (i.e., be able to accurately predict movement of the plume and pressure front, given
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the particular geologic conditions at the site), and the model must meet the requirements
specified in the Class VI Rule [40 CFR 146.84(c)(l)]. See Section 3 of the Draft UIC Program
Class VI Well AoR Evaluation and Corrective Action Guidance for additional information on the
required AoR modeling for a Class VI injection well.
A detailed geologic site characterization is essential to evaluating the presence and adequacy of
the geologic formations in a proposed area to both receive and confine the injected carbon
dioxide. The AoR and Corrective Action Plan must describe the site characterization data on
which the model will be based (e.g., porosity, permeability, geochemistry, artificial penetrations,
or stratigraphy). As discussed in Section 1, developing the plan will be an iterative process.
Developing and submitting a plan before the well is drilled will ensure that the owner or operator
and UIC Program Director agree on the approach, while allowing for the plan to be adjusted if
necessary as information is gathered during drilling and pre-operational testing. See the Draft
UIC Program Class VI Well Site Characterization Guidance for details on collecting this data,
including the use of strati graphic test wells, and the Draft UIC Program Class VI Well AoR
Evaluation and Corrective Action Guidance for EPA-recommended approaches for
incorporating this data into AoR delineation modeling.
Additionally, prior to authorizing injection, the UIC Program Director should evaluate the
delineated AoR along with all information submitted regarding the model and its assumptions.
This evaluation is necessary to ensure that the delineated AoR encompasses a sufficient area in
which corrective action will be performed so that no improperly constructed, plugged, or
abandoned wells are present that could serve as conduits for fluid movement into USDWs. An
AoR and Corrective Action Plan that includes a detailed and complete description of the model
and its planned inputs will be helpful for the UIC Program Director and facilitate and expedite
the review of the plan.
EPA recommends that the owner or operator convey in the plan to the UIC Program Director
how the model's code, input, and assumptions will be considered or accounted for, and that the
model will appropriately address local conditions and delineate an accurate AoR. Owners or
operators might use the following types of information when selecting a computational modeling
code for the AoR delineation and developing input parameters and assumptions:
Site Geology and Hydrogeology Information
The type and number of subsurface formations from the surface to the injection zone,
as determined by borehole sampling and logging, geophysical, and other tests or methods
to characterize the site geology;
For each formation, initial fluid pressures, horizontal and vertical gradients, and ground
water flow directions and velocity;
The presence and characterization of faults or fractures;
The presence of wells and mines;
Baseline geochemistry and the compatibility of the carbon dioxide stream with fluids in
the injection zone and minerals in the subsurface formations;
Multiphase flow parameters, and relevant permeability-saturation relationships and
equations of state; and
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The measures of porosity and permeability (and/or geostatistical or stochastic estimates
of these parameters).
Proposed Operating Data and Information
Proposed injection rates, pressures, and well depths;
The presence, or planned presence, of other injection (or production) wells, including
Class VI injection wells operated as part of separate projects, within the injection zone or
other pertinent zones; and
Information on all USDWs above the injection zone. If an injection depth waiver is
sought, all USDWs above and below the injection zone.
2.1.2 The minimum fixed frequency to reevaluate the AoR
The Class VI Rule requires owners or operators to periodically reevaluate the AoR to incorporate
monitoring and operational data. In the plan, owners or operators must describe the minimum
frequency at which this reevaluation will occur [40 CFR 146.84(b)(2)(i)]. In no case can this
reevaluation happen less frequently than every five (5) years from the date on which the UIC
Program Director grants approval for operation per 40 CFR 146.82(c). However, it may be
appropriate to reevaluate the AoR more frequently based on site-specific information, as
described below. This may be particularly important for the first reevaluation to verify, once
injection commences, that the carbon dioxide plume is behaving in the subsurface as predicted.
Owners or operators with multiple permitted wells at the same site may also opt to modify the
reevaluation schedule for wells brought online later to consolidate the reevaluation schedule for
all of the wells.
Below are some factors to consider when determining the minimum AoR reevaluation
frequency, including whether a reevaluation more frequently than every five (5) years would be
appropriate. EPA recommends that the AoR and Corrective Action Plan describe how these
factors were considered in determining the AoR reevaluation frequency.
The presence of multiple injection wells or planned additional injection wells: a
reevaluation may be warranted once all of the injection wells come online, or after a
threshold volume of carbon dioxide has been injected;
The pace of population growth and development or land use changes in the region:
rapid growth may indicate that additional public and private wells have been drilled or
that ground water supplies within the AoR are being developed for use;
Planned phased corrective action (see Section 2.1.5): an AoR reevaluation may be
warranted following commencement of injection and after a significant number of wells
are plugged;
Confidence in the modeling assumptions or the amount and quality of site
characterization data that will be used for AoR delineation or the general modeling
approach: significant uncertainties in site characterization data and the AoR delineation
modeling may be addressed by more frequent reevaluation and comparison to monitoring
data, particularly early in the project;
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Project duration: owners or operators of short-duration projects (i.e., injecting for less
than five [5] years) should consider planning for at least one AoR reevaluation or review
of monitoring and operating data during the life of the project;
Injection volumes and rates: UIC Program Directors may consider that higher volume
projects warrant more frequent reviews, particularly early in the injection phase;
Planned changes in operation: these changes may include the addition of injection
wells, changes to injection or production rates (e.g., associated with enhanced oil
recovery operations or dewatering/depressurization), or a change in the source of the
carbon dioxide; and
Public acceptance: if the public expresses concerns about the project (e.g., about safety
or environmental justice considerations) or if the public opposes the proposed siting of a
Class VI injection well, the publication of GS project monitoring results and an early
AoR reevaluation may help allay some of these concerns.
2.1.3 Conditions that would warrant an early AoR reevaluation
It may be necessary, based on site-specific circumstances or events, to reevaluate the AoR before
the next planned reevaluation (see Section 2.1.2 of this guidance document). The owner or
operator must describe in the AoR and Corrective Action Plan what monitoring or operational
conditions may warrant a reevaluation of the AoR prior to the next scheduled reevaluation [40
CFR 146.84(b)(2)(ii)]. EPA recommends that the owner or operator convey in the plan how the
following monitoring data and operating conditions would be considered in determining the need
for an unscheduled AoR reevaluation:
If monitoring data reveal an unexpected change in the rate or direction of carbon dioxide
plume movement, the areal extent of the plume, or formation pressures;
Changes in operation, including the addition of injection wells, changes to injection
rates or volumes injected, a change in production rates from the injection zone (e.g.,
associated with enhanced oil recovery operations or dewatering/depressurization), or
changing the source of the carbon dioxide. Similarly, if other owners or operators plan
to inject into the same formation as the subject Class VI well and their pressure effects
are anticipated to influence the well, then the AoR should be reevaluated to incorporate
those effects;
Following any seismic event, whether related to the GS project or not (the area over
which seismic events are considered would be site-specific);
Following an exceedance of any Class VI operating permit condition (e.g., exceeding
the permitted volumes of carbon dioxide injected); or
Newly available site characterization data that may impact model predictions.
2.1.4 How monitoring and operational data will inform AoR reevaluations
The Class VI Rule requires that the AoR delineation and reevaluations account for all available
operating, site characterization, and monitoring data. Owners or operators must describe in the
AoR and Corrective Action Plan how these data will be incorporated into the AoR reevaluation;
e.g., how the data will be collected and compared to model predictions, and if necessary,
incorporated into future modeling runs [40 CFR 146.84(b)(2)(iii)].
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An AoR reevaluation may not necessarily need to result in additional modeling or changes to the
site computational model. If, based on a comparison of the site monitoring data, project
information, and the current AoR model predictions, the owner or operator determines that no
changes to the model are necessary, then the owner or operator need only demonstrate to the UIC
Program Director that no model revision is necessary. EPA recommends that the plan discuss
how monitoring and modeling data will be compared, and how this demonstration of no model
revision will be made, if that demonstration is appropriate.
In the event that the owner or operator determines that revisions to the model are necessary, the
plan must discuss how the newly available data will be used to revise the model and AoR
delineation [40 CFR 146.84(b)(2)(iii)]. EPA recommends that these discussions tie closely to
how operating data will be collected and how the Testing and Monitoring Plan will be
implemented (see Section 3 of this guidance document). Owners or operators may consider
factors similar to those used to incorporate the site characterization data into the original model.
EPA recommends that the revised AoR and Corrective Action Plan discuss how the owner or
operator intends to consider the following:
How specific types of monitoring data (e.g., ground water quality or plume tracking
results) will be quantitatively compared to modeling results: EPA recommends that
the plan outline under what conditions deviations between monitoring data and model
results will be deemed "significant" and trigger a revision of the site computational
model and AoR delineation;
How model parameters will be adjusted to reflect monitoring data (i.e., model
calibration process) if a model revision is necessary;
How operational parameters (injection rate, injection pressure, and the total volume
injected) will be compared to the original model inputs: EPA recommends that the
plan outline when (and the threshold magnitude for which) deviations between model
inputs and actual operational conditions warrant a revision of the computational model
and AoR delineation;
How newly available site characterization data will be compared to existing data
used as model input parameters, and under what conditions newly available site
characterization data will trigger a revision of the computational model and AoR
delineation; and
How the impacts of other injection well owners or operators in the AoR (or new
owners or operators), including consideration of their operating procedures, may affect or
require alterations to the modeling.
2.1.5 How corrective action will be conducted
Owners or operators of all classes of injection wells, including Class VI injection wells, must
perform corrective action on all improperly plugged artificial penetrations identified within the
delineated AoR in order to ensure that they will not serve as conduits for fluid movement into
USDWs. All improperly plugged artificial penetrations within the AoR must be plugged using
materials that can withstand the potentially corrosive environment that results when the carbon
dioxide stream mixes with formation fluids [40 CFR 146.84(d)]. Additionally, at 40 CFR
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146.84(b)(2)(iv), the Class VI Rule affords owners or operators the option (if approved by the
UIC Program Director) of phased corrective action, (i.e., deferring corrective action for those
wells that are not expected, based on modeling and site-specific information, to be impacted by
the carbon dioxide plume or pressure front for several years).
The AoR and Corrective Action Plan must describe how the corrective action will be performed,
including the corrective action methods to be used, the schedule for completing all corrective
action, and what corrective action will be phased [40 CFR 146.84(b)(2)(iv)]. The plan must
address all wells in the AoR that are determined to need corrective action. It may be appropriate
to include a table that lists all wells identified within the AoR that need corrective action, the
scheduled date for performing corrective action (both pre-injection and during injection
operations), and the planned corrective action method(s). Specific information on determining
the appropriate corrective action methods and schedule for completion is presented below.
Corrective Action Methods
The Class VI Rule requires that all improperly plugged artificial penetrations located within the
AoR be addressed, but it does not specify the corrective action methods to be used. Instead, the
Class VI Rule affords flexibility in order to ensure that all corrective action methods employed
are appropriate to the specific artificial penetration needing plugging, the characteristics of the
injectate, and any other site-specific conditions that may be warranted (e.g., the formation
geochemistry).
The AoR and Corrective Action Plan must describe the specific corrective action activities that
will be taken for each type of improperly plugged artificial penetration located within the AoR
(e.g., depth and type of plugs; cement to be used). Well schematics may be appropriate.
Section 4 of the Draft UIC Program Class VI Well AoR Evaluation and Corrective Action
Guidance describes how to identify improperly plugged artificial penetrations within the AoR,
assess their integrity, and perform corrective action when necessary. EPA recommends that the
AoR and Corrective Action Plan convey how the following factors about the site and the
artificial penetrations within the AoR will be considered in determining the appropriate
corrective action methods:
The age of each improperly plugged well, the condition of the cement, and the overall
maintenance of the improperly plugged well (including maintenance records or the
lack thereof);
Well depth, which would affect the number of plugs and the types and amount of cement
needed;
The composition of the carbon dioxide stream, formation fluid geochemistry, and
the presence of other corrosive native fluids (e.g., hydrogen sulfide), which can
interact to impact the potential formation of carbonic acid that could react with or
degrade well materials or cements;
The presence of all USDWs and the characteristics of the formations penetrated by
the well, which may affect the number of plugs and the amount and types of cement
required; and
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The remedial techniques that will be used to address improperly plugged wells within
the AoR.
Corrective Action Schedule
The AoR and Corrective Action Plan must include a schedule for completing corrective action
on all improperly plugged wells located within the AoR. The Class VI Rule allows for phased
corrective action, so that improperly plugged wells that are not anticipated to be intersected by
the carbon dioxide plume and pressure front for several years may not need to be addressed prior
to commencing injection. However, for improperly plugged wells that will need corrective action
prior to injection, and whenever otherwise practical, EPA recommends that the AoR and
Corrective Action Plan include approximate timeframes for performing corrective action. The
plan should also include a schedule for performing corrective action on all improperly plugged
wells located within the AoR that are determined to need corrective action (i.e., which wells will
be plugged in year 1, year 2, etc.). EPA encourages owners or operators to be as specific as
possible in identifying the dates of planned corrective action activities or notify the UIC Program
Director when the dates are set to give the UIC Program Director an opportunity to witness the
corrective plugging activities.
The AoR and Corrective Action Plan must describe the following [40 CFR 146.84(b)(2)(iv)]:
What corrective action will be performed prior to the start of injection: The plan must
demonstrate that all improperly plugged wells located within the AoR that are determined
to need corrective action, and are likely to be intersected by the carbon dioxide plume and
pressure front early on, will receive corrective action in a timely manner. This
determination would be tied to modeled predictions of the rate of plume movement. If
phased corrective action is approved, pre-injection corrective action would only be
necessary in areas with a high certainty of carbon dioxide exposure during the first
several years of injection as informed by site characterization data and modeling.
Conversely, if modeling indicates that the injected carbon dioxide plume and pressure
front will expand throughout the AoR in a short time, all corrective action should be
completed prior to the initiation of carbon dioxide injection operations.
What corrective action will be phased: If phased corrective action is planned, the AoR
and Corrective Action Plan must describe which portions of the AoR will have corrective
action performed on a phased basis. The plan must also describe how the phasing was
determined; i.e., it must justify why corrective action on certain improperly plugged wells
can be deferred until a later date, based on modeled predictions.
It is important to note that phased corrective action must be approved by the UIC
Program Director. If an owner or operator seeks to phase corrective action, consultation
with the UIC Program Director is encouraged in order to identify whether phased
corrective action is appropriate based on information about a proposed Class VI injection
well site and to avoid unnecessary delays in injection operations.
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To ensure that corrective action activities on all improperly plugged wells will be
possible, the owner or operator must also describe in the plan how surface access to all
wells needing corrective action will be guaranteed. The owner or operator will need to
obtain the right of access to improperly plugged wells in order to perform the necessary
corrective action and demonstrate in their submitted AoR and Corrective Action Plan that
these access rights have been granted. This demonstration may include information
regarding how the owner or operator will maintain current information on land ownership
changes or enter into necessary agreements with current land owners to be able to access
and address the improperly plugged wells. If surface access rights cannot be guaranteed,
or if additional development of the land area around the improperly plugged well is
anticipated, it may be beneficial to complete all corrective action activities prior to
commencing injection activities or prior to the additional land development.
How the corrective action schedule will be adjusted if there are changes in the AoR: The
plan must also describe how any changes to the delineated AoR will be addressed (i.e., if
the reevaluation determines that the carbon dioxide plume is moving differently than
modeled/expected). For example, EPA recommends that the plan describe how additional
improperly plugged wells will be identified and corrected expeditiously in advance of
being intersected by the carbon dioxide plume or pressure front.
While every attempt must be made to identify and address all wells needing corrective action,
some corrective actions may need to be conducted on an emergency basis. Owners or operators
should consider this possibility and develop procedures for implementing emergency corrective
actions (see also Section 6.1 on emergency and remedial response planning). Owners or
operators might consider the following factors in determining which improperly abandoned wells
located within the AoR need to be corrected prior to initiating injection and in developing the
corrective action schedule to be submitted with the plan. EPA recommends that the owner or
operator convey in the plan how these factors will be considered in complying with the Class VI
Rule corrective action requirements:
Any predictions of plume or pressure front migration rates that may be available
during the preparation of the plan;
The historical use of wells and the location and density of artificial penetrations in the
AoR of the well. For GS projects in saline reservoirs, there may be few, if any, existing
well bores. However, older/well-developed oil and gas fields may have a significant
number of wells.
The number of deficient wells. If there are many improperly plugged wells to correct,
then the corrective action implementation schedule may need to account for a larger
effort; and
The pace of development or land use changes in the region, which may increase the
chance that additional wells, including other Class VI injection wells will be drilled (or
abandoned) between AoR evaluations.
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2.2 UIC Program Director's Evaluation of the AoR and Corrective Action Plan
The UIC Program Director must evaluate the proposed AoR and Corrective Action Plan, along
with the geologic and proposed operating data submitted with the Class VI permit application in
order to determine whether to approve the plan. Therefore, the owner or operator must
demonstrate in the proposed plan, to the UIC Program Director's satisfaction, that implementing
the plan will result in: an appropriately modeled AoR, a thorough identification of the
improperly plugged wells located within the AoR, and a justifiable schedule for correcting all
deficient wells located within the AoR.
The UIC Program Director should evaluate the proposed AoR and Corrective Action Plan to
verify that all of the required elements, as described in 40 CFR 146.84(b), are present and that
the plan accounts for all of the site-specific conditions that need to be addressed in order to
ensure that USDWs will be protected from endangerment. Examples of possible considerations
by the UIC Program Director are given below:
Examples of Considerations Related to the AoR Delineation:
Is the code that will be used to develop the AoR delineation model sufficient to accurately
predict movement of the carbon dioxide plume and pressure front; and does it have the
capability to incorporate multiphase flow, the relative buoyancy of carbon dioxide, and three-
dimensional geologic heterogeneity?
Does the proposed model incorporate all relevant site geology, data on subsurface pressures
and fluid movement, and proposed operating data submitted with the Class VI permit
application?
Have sensitivity analyses of the model been performed; do they corroborate the initial
modeling results?
Is sufficient information submitted regarding modeling assumptions, including relative
permeability/saturation relationships and equations of state?
Is the proposed AoR reevaluation schedule appropriate based on the operational conditions or
anticipated monitoring data?
Have the geologic factors and operational conditions that could warrant a change in the
reevaluation schedule been included in the plan?
Examples of Considerations Related to Corrective Action:
Has a reasonable effort been made to locate all improperly plugged wells located within the
AoR? Has the condition of each improperly plugged well been established, and based on this
information, is the plan sufficient to ensure that no wells in the AoR will serve as conduits
for fluid movement into USDWs?
Are the remediation techniques proposed to be used appropriate to the number and condition
of all the improperly abandoned wells located within the AoR?
The UIC Program Director has discretion to allow for phased corrective action activities. In
determining whether to exercise this discretion, the UIC Program Director may consider:
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The proposed carbon dioxide injection rate, total injection volumes, and the duration of
the project;
The composition of the carbon dioxide stream and potential impacts on native/formation
fluids and the rock matrix;
The density of artificial penetrations in the vicinity of the injection project;
The anticipated number of wells that will need corrective action, and possible "work
load" issues in addressing all of the deficient wells in a large or densely penetrated AoR;
Whether there is a guarantee that all wells can be accessed and remediated at the
appropriate time; and
The AoR delineation modeling uncertainty and the resulting impact on the size and shape of
the AoR.
The submittal, evaluation, and approval of the AoR and Corrective Action Plan may be an
iterative process, involving multiple drafts, until all the information required is submitted at the
appropriate level of detail, as determined by the UIC Program Director. If the UIC Program
Director has reason to believe (e.g., based on site-specific conditions) that additional data are
needed to sufficiently address the anticipated risk associated with the proposed injection (e.g.,
through adjustments to the model or corrective action methods), it is within his/her authority to
request that additional site-specific information be collected, or additional activities be included
and described in the AoR and Corrective Action Plan.
EPA recommends that owners or operators consider revising portions of the AoR and Corrective
Action Plan as site characterization data become available and modeling is performed. For
instance, if AoR modeling indicates that the carbon dioxide plume and pressure front will move
faster than initially anticipated based on preliminary geologic data (especially if abandoned wells
are to be intersected by the carbon dioxide plume/pressure front), EPA recommends that the
owner or operator consider whether the originally planned corrective action schedule is
appropriate. Likewise, it may not be possible to prepare a final tabulation of all the improperly
abandoned wells in the AoR that require corrective action until the AoR delineation modeling is
complete.
The owner or operator and the UIC Program Director are encouraged to discuss the AoR and
Corrective Action Plan prior to final submittal, e.g., to review the advantages and disadvantages
of various modeling approaches, whether to phase corrective action, etc. Such discussions prior
to developing and submitting the proposed AoR and Corrective Action Plan can increase the
chance that the plan will be approved and avoid any need to revise and resubmit the plan. This
background preparation may also limit the need for future amendments to the AoR and
Corrective Action Plan. The approved AoR and Corrective Action Plan (including all approved
activities and schedules) is enforceable, whether or not the plan is a condition of the permit,
because the plan itself and the UIC Program Director's approval are required by the Class VI
Rule [40 CFR 146.84(b)].
Appendix F presents a checklist of questions and considerations that UIC Program Directors may
use when evaluating the proposed AoR and Corrective Action Plan and other GS project plans.
For additional information on the UIC Program Director's evaluation of the plan, including
exercising discretion regarding phased corrective action, see the Draft UIC Program Class VI
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Implementation Manual, available on EPA's website at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cftn.
2.3 Amending the AoR and Corrective Action Plan
The Class VI Rule requires that the AoR and Corrective Action Plan be reviewed and, if
necessary, amended following each reevaluation of the AoR [40 CFR 146.84(e)]. The purpose of
this review is to ensure that the management of the GS project is based on the most up-to-date
information available in order to protect USDWs from endangerment. This review of the AoR
and Corrective Action Plan follows the required AoR reevaluation, which must occur at least
once every five (5) years (see the Draft UIC Program Class VI Well AoR Evaluation and
Corrective Action Guidance for additional information on performing AoR reevaluations).
Reevaluations of the AoR must continue throughout the life of the GS project, including the
post-injection phase. It is likely that, following cessation of injection, the area of increased
pressure will reduce in size as pressures dissipate. Therefore EPA expects that the reviews will
entail an examination of monitoring data and confirmation and communication to the UIC
Program Director that no modifications to the AoR or amendments to any plans are needed.
However, this step is necessary to ensure that USDWs are not endangered and that all of the
plans in force (i.e., including the PISC and Site Closure and Emergency and Remedial Response
Plans) remain protective of USDWs.
The owner or operator must submit the amended AoR and Corrective Action Plan to the UIC
Program Director for approval following an AoR reevaluation or any other event that triggers an
AoR and Corrective Action Plan review [40 CFR 146.84(e)]. EPA recommends that owners or
operators submit the revised AoR and Corrective Action Plan along with revisions to the Testing
and Monitoring Plan and the Emergency and Remedial Response Plan, both of which are due
within (1) year of an AoR reevaluation, or within one (1) year of any other event that triggers an
AoR reevaluation.
To assess the need for amending the AoR and Corrective Action Plan, EPA recommends that
owners or operators use the results of the AoR reevaluation, along with monitoring data (e.g.,
carbon dioxide plume and pressure front tracking and ground water monitoring) and operational
data (e.g., injection rates and volumes) collected since the last reevaluation. It is recommended
that the owner or operator also undertake a review of the AoR and Corrective Action Plan if
there are significant changes to the facility, such as the permitting of an additional injection well,
or if any adverse events occur that require the implementation of an emergency response.
EPA recommends that, as part of their ongoing dialogue, the owner or operator and the UIC
Program Director discuss the most recent AoR delineation or reevaluation, along with
monitoring and operational data collected, and any other pertinent information about the carbon
dioxide injection operation during this plan review. This communication and coordination is an
important part of the process to ensure that the GS project is (and continues to be) managed
appropriately to protect USDWs, and that injection operations remain in compliance with permit
conditions. These discussions can also help the owner or operator understand the UIC Program
Director's expectations, including whether an amended plan might be needed, so that the UIC
Program Director receives all the required information up front in order to facilitate the review
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process. The Sections below describe a recommended process by which the owner or operator
may review and amend the AoR and Corrective Action Plan:
Step 1: Review the results of the AoR reevaluation or relevant monitoring and operational
data. The purpose of this review is to identify whether an amendment to the AoR and Corrective
Action Plan is needed. Questions and potential approaches that may be considered in the review
include:
Did the most recent AoR reevaluation identify a need to revise the AoR computational
model? If so, the AoR and Corrective Action Plan may need to be amended to reflect any
changes to the modeling approach or the modeled AoR.
Do the most recent AoR modeling results closely match monitoring results? If not, it may be
necessary to revise the model, adjust the modeling assumptions, and/or review or supplement
input data.
Is the plume or pressure front moving faster or in a different direction than previously
predicted? This may indicate that more frequent AoR reevaluation is appropriate.
Do additional wells need corrective action, or do some wells previously identified for
corrective action need to be addressed earlier than planned, based on modeling results or
monitoring data? Either of these situations may necessitate revisions and amendments to the
corrective action plan.
Have land use changes potentially affected the owner's or operator's ability to secure rights
to access wells identified as needing corrective action? These land use changes may
necessitate revisions to the corrective action schedule, e.g., to implement corrective action on
some improperly abandoned artificial penetrations before the planned changes to land
ownership take place.
Step 2: Discuss the results with the VIC Program Director. EPA recommends that the owner or
operator and the UIC Program Director discuss whether an amendment to the AoR and
Corrective Action Plan is needed, based on the considerations in Step 1. The final decision
regarding the need for an amended plan will be made by the UIC Program Director.
If a review of the AoR delineation or other project data indicates that an amendment to the AoR
and Corrective Action Plan is needed, it is important that the owner or operator begin revising
the plan as soon as practical and coordinate this revision with review of the Testing and
Monitoring Plan and the Emergency and Remedial Response Plan, so that the one (1) year
deadline for amending those plans can be met. Regardless of whether a conversation with the
UIC Program Director takes place, it is recommended that the owner or operator use the site-
specific monitoring and operational data to prepare and present a recommendation for action on
an amended AoR and Corrective Action Plan.
If, based on a review of all available data and information, no amendment is needed, the owner
or operator must continue to implement the existing approved AoR and Corrective Action Plan,
i.e., continue any phased corrective action as described in the approved schedule and perform
AoR reevaluations as planned.
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Step 3: Amend the AoR and Corrective Action Plan if needed. EPA recommends that the
amended AoR and Corrective Action Plan include the same categories of information that were
included in the original plan developed before injection commenced (see Section 2.1 of this
guidance document for a description of the required plan elements). After injection has begun,
and as new operational and monitoring data become available, the following changes may
necessitate an amendment to the plan:
Based on a comparison of previous modeling results and monitoring data, revisions may be
required for the AoR modeling approach and can include justified modifications to the code
used, parameterization process, assumptions (e.g., relative permeability/saturation
relationship), or the representation of site-specific geologic conditions in the model;
If the predicted extent of the AoR changes, additional improperly plugged wells may be
located within the newly defined AoR boundary. Likewise, if the plume and pressure front
are moving at a faster rate than originally predicted (as evidenced through monitoring data or
modeling), revisions to the phasing schedule for corrective action activities may be needed;
Information about when the next AoR reevaluation will be performed, or confirmation that
the next scheduled reevaluation is appropriate, versus identifying the conditions that would
warrant an AoR reevaluation ahead of schedule; or
Any newly developed procedure that was not in the approved plan should be described in the
amended plan and be submitted for the UIC Program Director's approval.
Step 4: Submit the amended plan. The Class VI Rule requires that the owner or operator submit
the amended AoR and Corrective Action Plan to the UIC Program Director for approval
following an AoR reevaluation or any other event that triggers an AoR and Corrective Action
Plan Review [40 CFR 146.84(e)]. EPA recommends that owners or operators submit the revised
AoR and Corrective Action Plan along with revisions to the Testing and Monitoring Plan and the
Emergency and Remedial Response Plan, both of which are due within one (1) year of an AoR
reevaluation or after any other event that triggers a revision of those plans.
The amended plan must be approved by the UIC Program Director and would then be
incorporated into their Class VI permit [40 CFR 146.84(e)(4)]. If changes to the AoR and
Corrective Action Plan are needed, the UIC Program Director may need to modify the Class VI
permit. A permit modification under 40 CFR 144.39 (e.g., to incorporate a larger AoR or a larger
number of wells needing corrective action) would require notification to the public and an
opportunity for public participation and comment. See 40 CFR Part 124 for the details of the
process. Minor changes to the plan, as defined under 40 CFR 144.41 (e.g., to provide
clarification, correct typographical errors, or other minor changes), do not require a permit
modification or a public process under 40 CFR Part 124. See the Draft UIC Program Class VI
Implementation Manual., available on EPA's website, for additional information about the
procedures for modifying Class VI permits and the related plan amendments.
3.0 Testing and Monitoring Plan
Testing and monitoring are important components of managing a GS project to ensure that
USDWs are not endangered. Information generated through a rigorous testing and monitoring
regime can provide information about site performance (e.g., the behavior and extent of the
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carbon dioxide plume and pressure front) when compared to baseline site characterization
information submitted prior to injection or to any previously collected monitoring results.
Monitoring data can also be used to demonstrate that the project is performing as predicted, or
provide warning that unexpected fluid movement has occurred and that USDWs may be
endangered. For example, monitoring data can demonstrate that the carbon dioxide is confined in
the injection zone as predicted; identify the potential corrosion of well construction materials and
signal needed construction/mechanical integrity fixes; or identify changes in formation fluid
geochemistry (e.g., pH decreases that could cause metals to leach into the ground water).
Appropriate monitoring of a GS site can also provide data to maintain the efficiency of the
storage operation, minimize costs, provide input data for AoR reevaluation modeling, or target
future corrective action.
3.1 Developing the Testing and Monitoring Plan
The Class VI Rule, at 40 CFR 146.90, describes the required elements of a Testing and
Monitoring Plan, including: injectate analysis, monitoring the injection operation, corrosion
monitoring, monitoring of geochemical changes in the subsurface, mechanical integrity tests
(MITs), pressure fall-off testing, tracking the carbon dioxide plume and area of elevated
pressure, surface air and/or soil gas monitoring for carbon dioxide fluctuations (at the discretion
of the UIC Program Director), and any additional tests determined by the UIC Program Director
to be necessary to ensure protection of USDWs from endangerment.
Guidance presenting recommended approaches to performing the activities under the approved
Testing and Monitoring Plan (e.g., how to select appropriate testing equipment, monitoring
techniques, locations, and frequencies) can be found in the Draft UIC Program Class VI Well
Testing and Monitoring Guidance posted on EPA's website at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm. Exhibit 3 presents highlights
of the information presented in that guidance.
The Testing and Monitoring Plan must be submitted with the Class VI permit application for
approval by the UIC Program Director [40 CFR 146.82(a)(15)]. It must include a description of
how the owner or operator will meet the requirements of 40 CFR 146.90, including quality
assurance and surveillance measures, and obtaining necessary access to sites for all testing and
monitoring during the life of the GS project. The Testing and Monitoring Plan should be site-
specific and reflect the unique properties of the proposed site to ensure that early warning of
USDW endangerment is provided.
The Sections below present the required elements of the Testing and Monitoring Plan, how they
may be described to demonstrate to the UIC Program Director's satisfaction that the plan is
sufficient and can be approved, and the issues that owners or operators may consider as they
develop their plan. Some of the elements of the Testing and Monitoring Plan are highly site-
specific (e.g., monitoring well placement) and will require detailed descriptions of how these
specific factors were identified and considered in developing the plan. Other elements of the
Testing and Monitoring Plan (e.g., where testing frequency is set in the Rule) may require less
site-specific consideration and description. Appendix B of this guidance document presents a
sample template of a Testing and Monitoring Plan.
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Exhibit 3: Draft UIC Program Class VI Well Testing and Monitoring Guidance Highlights
The Draft UIC Program Class VI Well Testing and Monitoring Guidance presents recommended approaches for
performing the monitoring and testing activities required of Class VI well owners or operators during the lifetime of
a GS project.
The introductory Section reviews the Class VI regulations related to testing and monitoring. Remaining Sections of
the guidance address the following topics:
Performance of internal and external mechanical integrity tests during operation;
Conducting operational testing and monitoring during injection;
Ground water monitoring and geochemical monitoring above the confining zone(s);
Tracking of the carbon dioxide plume and pressure front; and
Monitoring of surface air and/or soil gas around the injection site.
For each Section, the guidance:
Presents recommended ways to perform activities necessary to comply with Class VI Rule testing and
monitoring requirements (e.g., ground water monitoring, MITs).
Provides references to other, more comprehensive, reference documents and published scientific literature for
further information.
Explains how and when to report to EPA the results of activities related to testing and monitoring and all
relevant information that the UIC Program Director may evaluate.
3.1.1 Analysis of the carbon dioxide stream
The Class VI Rule requires owners or operators to analyze the carbon dioxide stream with
"sufficient frequency to yield data representative of its chemical and physical characteristics" [40
CFR 146.90(a)]. Chemical characteristics include the fluid composition (e.g., the concentration
of impurities in the carbon dioxide). Physical characteristics include temperature and pressure.
The Draft UIC Program Class VI Well Testing and Monitoring Guidance provides detailed
information and recommended approaches on performing analyses of various physical and
chemical parameters of carbon dioxide streams.
EPA recommends that the Testing and Monitoring Plan describe parameters and the frequencies
at which they will be tested, and that the Plan specify, for each analyte/parameter, sampling
methods; the analytical technique to be used; whether the testing will be done in-house or at a
laboratory; and quality assurance and surveillance measures. To demonstrate that the proposed
analysis will be performed at an appropriate frequency, the schedule may include testing dates as
appropriate (e.g., the first day of each quarter or month), and describe how the test results are to
be recorded and reported to the UIC Program Director.
The necessary type and frequency of injectate analysis will be project-specific and will depend
on the carbon dioxide source and the likelihood of variability in injectate composition. EPA
recommends that the owner or operator consider and include the following in developing the
Testing and Monitoring Plan:
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The source of the carbon dioxide: it is important that the suite of parameters tested
reflect the potential for impurities, based on the process generating the carbon dioxide
and the capture technologies. Note: if the presence or concentrations of impurities render
the carbon dioxide a hazardous waste, the injection well would need to be permitted as a
Class I hazardous waste injection well.
Whether the source of the carbon dioxide will vary over the life of the well: for
example, a carbon dioxide-capture process from a coal-fired power plant with a
consistent coal source and operating parameters is likely to produce a carbon dioxide
stream with a fairly consistent composition. Frequent changes in the carbon dioxide
source, or multiple carbon dioxide sources, may necessitate more frequent or varied
analysis that aligns to changes in the source facility or may necessitate testing and
monitoring for additional parameters.
The potential for changes in the composition of the carbon dioxide stream based on
contamination during transport (i.e., within a pipeline), including any mixing with water.
3.1.2 Installation and use of continuous recording devices
Owners or operators of Class VI wells must install and use continuous recording devices to
monitor: injection pressure, injection rate, and volume of fluid injected; the pressure on the
annulus between the tubing and the long-string casing; and the annulus fluid volume added [40
CFR 146.90(b)]. Continuously monitoring these parameters (required in lieu of internal MITs)
helps to verify that the well has internal mechanical integrity and ensure that the injection facility
is operating within permitted limits so as to not fracture the confining zone(s). These data can
also serve as inputs for modeling to support AoR reevaluations. See the Draft UIC Program
Class VI Testing and Monitoring Guidance at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm for descriptions of the types of
gauges and meters available for use when monitoring these types of parameters.
In the Testing and Monitoring Plan, EPA recommends that owners or operators describe the
recording devices to be used for continuous monitoring, as well as the associated quality
assurance and surveillance measures, the frequency at which the information will be recorded
(e.g., every 20 seconds), and how the data will be retained and reported to comply with the
reporting and recordkeeping requirements at 40 CFR 146.91.
3.1.3 Corrosion monitoring
The Class VI Rule requires owners or operators to monitor the injection well materials for signs
of corrosion, including loss of mass, thickness, cracking, pitting, and other signs of corrosion [40
CFR 146.90(c)]. This corrosion monitoring must be performed on a quarterly basis. Corrosion
monitoring is necessary to verify that the well components meet the minimum standards for
material strength and performance, and to identify well maintenance needs. Corrosion of well
construction materials is a particular concern for Class VI wells given that carbon dioxide in the
presence of water becomes acidic, potentially accelerating the corrosion of construction
materials. The carbon dioxide stream for a GS project may also contain small volumes of
impurities (e.g., sulfur dioxide) that could contribute to corrosion.
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Class VI well operators can meet the Class VI Rule corrosion monitoring requirement by
analyzing coupons of the well construction materials that are placed in contact with the carbon
dioxide stream or by routing the carbon dioxide stream through a loop constructed of the
material used in the well and inspecting the materials in the loop. Owners or operators may also
use an alternative method, if it is approved by the UIC Program Director. See the Draft UIC
Program Class VI Well Testing and Monitoring Guidance for additional information on
corrosion testing methods.
EPA recommends that the Testing and Monitoring Plan describe the corrosion monitoring
program, including the monitoring method to be used and any associated quality assurance and
surveillance measures. If the owner or operator seeks to use an alternative corrosion testing
method, the Testing and Monitoring Plan should describe the method to be used and why it is
appropriate for the project, e.g., to the specific injectate or the well characteristics. The owner or
operator must discuss with the UIC Program Director the appropriateness of alternative methods
as the plan is developed [40 CFR 146.90(c)(3)]. EPA recommends that the Testing and
Monitoring Plan also include a schedule for performing the quarterly tests (e.g., anticipated
testing dates) and how the data will be reported.
3.1.4 Ground water quality monitoring
Owners or operators must perform periodic monitoring of ground water quality and geochemical
changes above the confining zone(s) [40 CFR 146.90(d)]; EPA recommends that this monitoring
also include USDWs. This monitoring is important for identifying any geochemical changes that
may be a result of fluid movement through the confining zone(s) and/or any fluid movement into
USDWs, including whether formation fluids have acidified and might have leached (or may
leach in the future) metals into the ground water.
Site characterization data (particularly baseline geochemical data) should be considered in
selecting ground water monitoring parameters, and ground water monitoring data should be
compared to the initial data collected during site characterization. See the Draft UIC Program
Class VI Well Site Characterization Guidance for suggestions about what information must be
generated as part of the baseline data collection required under 40 CFR 146.82(a). The location
and number of monitoring wells must be based on specific information about the GS project,
including site-specific geology and baseline geochemistry, the presence of artificial penetrations,
and planned operations (carbon dioxide injection rates and volumes).
Where injection depth waivers are sought, the plan must also describe the ground water quality
monitoring that will be done below the lower confining zone, e.g., in the first USDW below the
lower confining zone. See the Draft UIC Program Class VI Well Injection Depth Waivers
Guidance for additional monitoring considerations for wells operating under injection depth
waivers. See the Draft UIC Program Class VI Well Testing and Monitoring Guidance for
additional information on ground water monitoring, including analytical methods and monitoring
well design.
It is recommended that the Testing and Monitoring Plan describe the number and placement of
monitoring wells, the parameters to be monitored, and the frequency at which sampling and
analysis will be performed. EPA also recommends that the plan include maps that identify the
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injection well, the AoR, and the placement of all planned monitoring wells. Ground water quality
monitoring is site-specific and depends on many factors; considerations for each of these aspects
of the Testing and Monitoring Plan are described below.
Monitoring Well Placement
Planning of monitoring well placement should include the number of wells, their distribution
within the AoR, and their depth; the subsurface formations to be sampled; and the screened
interval(s). The Testing and Monitoring Plan should identify (e.g., with the use of maps and
cross sections) the location and depth of each monitoring well. The owner or operator must also
indicate in the plan that they will be able to access (e.g., have rights to drill and sample the
ground water) all planned monitoring well locations.
EPA recommends that owners or operators consider the installation and operation of more than
the minimally acceptable number of monitoring wells. For example, owners or operators may
consider and discuss with the UIC Program Director what monitoring may be needednot only
in the near term, but also during the period of active injection operations (i.e., as the injected
carbon dioxide is moving away from the well). More extensive and frequent monitoring from the
outset of the injection operation may eliminate the need for future amendments to the Testing
and Monitoring Plan or to the permit. This more extensive and frequent monitoring throughout
the injection phase may also support more dependable non-endangerment demonstrations during
the post injection site care (PISC) phase of a GS project (see Section 5 of this guidance
document).
EPA recommends that owners or operators consider the tradeoff between a monitoring program
with a large number of monitoring wells versus a minimum number of wells, based on site-
specific geologic conditions and the subsurface impacts of drilling monitoring wells. An
extensive monitoring program involving many monitoring wells could better characterize
changes in subsurface geochemistry and more closely track the carbon dioxide plume; however,
with a larger number of wells, there is an increased chance that one or more wells could serve as
a conduit for fluid movement into USDWs. Where possible, owners or operators may consider
using monitoring wells for multiple purposes, such as ground water monitoring above the
confining zone and pressure monitoring in the injection zone, to satisfy the requirements at 40
CFR 146.90(g); see Section 3.1.7 of this guidance document. While wells with multiple
screenings (i.e., in the injection and confining zones) may be more expensive to construct, this
multiple usage of a single monitoring well may ultimately reduce costs. Appropriate design
specifications for wells with multiple screenings in different zones are provided in the Draft UIC
Program Class VI Well Testing and Monitoring Guidance.
Existing wells in the AoR may be considered for use as monitoring wells. Enhanced oil or gas
recovery fields, for example, might contain existing production or monitoring wells that could be
adapted for use as monitoring wells instead of being plugged.
It is important that monitoring wells be properly designed and constructed in order to reduce
their potential to serve as conduits for fluid movement into USDWs. This is particularly
important where the monitoring wells perforate the confining zone (e.g., to allow pressure
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monitoring in the injection zone or to sample ground water below the lower confining zone for
wells operating under injection depth waivers). EPA recommends that the Testing and
Monitoring Plan include schematics of the planned monitoring wells, including the sampling
equipment the owner or operator plans to use. The Draft UIC Program Class VI Well Testing
and Monitoring Guidance provides additional information on monitoring well construction.
Monitoring wells that are not used to inject carbon dioxide are not Class VI wells and do not
need to have all of the project plans that are required for Class VI wells. However, drilling these
wells may require a state permit, so owners or operators should confer with appropriate state
permitting authorities to confirm what state requirements apply. EPA clarifies that the
monitoring well is part of the Testing and Monitoring Plan, which must be approved by the UIC
Program Director.
The location, number, and depth of monitoring wells must be based on site-specific information
about the project [40 CFR 146.90(d)(l)]. See the Draft UIC Program Class VI Well Testing and
Monitoring Guidance for additional information on proper well spacing. The Testing and
Monitoring Plan must describe how the following information has been considered in
determining appropriate monitoring well placement [40 CFR 146.90(d)(l)]:
The depth, thickness, and permeability of the injection and confining zones,
USDWs, and any relevant additional zones;
The size and shape of the AoR, based on the current delineation;
The presence of artificial penetrations; and
The planned injection rates and volumes
Other site-specific considerations the owner or operator may consider in planning monitoring
well placement include:
Land use changes in the region and the pace of development, including the presence
of sensitive populations such as children and environmental justice concerns, which
may warrant additional monitoring to address public concerns. EPA recommends that
owners or operators work with the UIC Program Director on any issues pertaining to
environmental justice concerns and sensitive populations, as the UIC Program
Director may have additional tools and resources to assist in this process;
Proximity to USDWs, public water supplies, or private wells, which may
necessitate additional monitoring, particularly if all residents in the vicinity of the
well rely on one USDW for their drinking water supply;
The presence of other injection operations, which may impact geochemical
changes in formation fluids or subsurface fluid movement; and
The possibility of conducting water quality monitoring in the injection zone using
wells needed for pressure monitoring (i.e., monitoring for the presence or absence
of elevated pressure) [40 CFR 146.90(g)]. See Section 3.1.7 of this guidance
document for more information.
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Monitoring Parameters
Determining the ground water monitoring parameters to be analyzed is site-specific. EPA
expects that ground water collected above the confining zone, or from any additional zones,
would most likely be monitored for, at a minimum, carbon dioxide species; total dissolved solids
(IDS); specific conductivity (SC); temperature; potential for hydrogen ions (pH), i.e., a measure
of water acidity; and carbon dioxide. In addition, based on site-specific considerations, owners or
operators may also monitor for major anions and cations; trace metals (e.g., arsenic, mercury, or
lead); carbon dioxide tracers; hydrocarbons; and volatile organic compounds (VOCs). EPA
suggests that the choice of monitoring parameters be based on the baseline geochemical data
collected during the initial site characterization, all previous monitoring data, and any available
geochemical modeling information.
To satisfy the UIC Program Director that the plan is approvable, the Testing and Monitoring Plan
should describe the specific parameters to be monitored and detail any additional factors that
were considered in developing the list of monitoring parameters. In addition, EPA recommends
that the planned sample collection, handling (i.e., chain of custody), and analytical procedures be
provided; the plan should also describe the analytical methods and the name of the certified
laboratory that will perform the analysis. The Draft UIC Program Class VI Well Testing and
Monitoring Guidance describes examples of acceptable sampling procedures for ground water
monitoring at GS sites.
EPA recommends that owners or operators consider and convey to the UIC Program Director the
following in determining which geochemical parameters to include in the Testing and
Monitoring Plan:
If any impurities are present (or may be anticipated to be present) in the carbon dioxide
stream (e.g., hydrogen sulfide) because it is important that these be included in routine
ground water monitoring;
The type of target formation; for example, EPA recommends that owners or operators
of GS projects located in depleted (or depleting) oil and gas reservoirs monitor for
residual hydrocarbons that may be in the formation and potentially mobilized into ground
water as a result of carbon dioxide injection; and
If site-specific data generated during the baseline geochemical survey indicate the
presence of arsenic or other metals that have the potential to be mobilized by the
injection activity, it may be appropriate to monitor for heavy metals, organic
contaminants, and dissolved minerals.
Monitoring Frequency
EPA recommends that the Testing and Monitoring Plan describe, for each monitoring parameter,
the proposed frequency of sampling and analysis. Testing for more typical parameters, such as
TDS, aqueous and pure carbon dioxide, and pH will likely occur relatively frequently, while
parameters less likely to occur in ground water may warrant less frequent analysis.
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The Class VI Rule requires that the owner or operator consider baseline geochemical data and
AoR modeling results in determining the monitoring frequency [40 CFR 146.90(d)(2)]. Thus, the
Testing and Monitoring Plan must describe how these factors were considered. EPA
recommends that owners or operators also consider the schedule for planned AoR reevaluations,
so that the ground water monitoring data are available to serve as inputs for future modeling
runs, if necessary.
3.1.5 A demonstration of external mechanical integrity
Owners or operators of GS projects must perform external MITs to determine the absence of
significant fluid movement into a USDW through potential channels adjacent to the injection
well bore [40 CFR 146.90(e)]. Regular MITs are an important protective measure that can
indicate the need for well repairs in order to avoid potential contamination through the well bore.
The Class VI Rule, at 40 CFR 146.89(c), specifies the approved MIT methods for Class VI
wells: an approved tracer survey, such as an oxygen-activation log, or a temperature or noise log.
Other MIT methods may be approved by the EPA Administrator. However, a request for using
alternative methods other than those currently approved by EPA requires an additional EPA
approval process to become acceptable and the eventual publication of the alternative method
approval in the Federal Register, as required at 40 CFR 146.89(e). Therefore, EPA recommends
that owners or operators discuss any such need for an alternative MIT method with the UIC
Program Director as early as possible to determine what course of action may be preferred to
avoid delays in approving the Testing and Monitoring Plan.
Note that periodic internal MITs are not required for Class VI injection wells. The continuous
monitoring that is briefly described in Section 3.1.2 of this guidance document is required to be
performed in lieu of internal MITs during injection operations. However, internal MITs must still
be performed before commencing injection and before plugging the well [40 CFR 146.82(c)(8)
and 146.92(a)].
Selecting the specific MITs to be used at an injection well should be based on the well design
and the planned use of automatic surface or down-hole shut off devices [40 CFR 146.88(e)(2)
and 146.88(e)(3)]. See the Draft UIC Program Class VI Well Testing and Monitoring Guidance
for additional information on available MITs. See Section 2 of the Draft UIC Program Class VI
Well Construction Guidance for additional information on using surface and down-hole shut off
devices.
The UIC Program Director has the discretion to require the use of casing inspection logs to
determine if there is any casing corrosion [40 CFR 146.89(d)]. The frequency of this casing
corrosion test is established based on site-specific and well-specific conditions, and EPA
recommends that this information be incorporated into the Testing and Monitoring Plan. See
Section 3.1.3 for additional information on other types of corrosion monitoring.
External MITs must be performed at least once per year. However, the owner or operator may set
the testing schedule to coincide with regularly scheduled well workovers or other routine well
maintenance. EPA recommends that the plan describe the specific MITs to be employed, the
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associated quality assurance and surveillance measures, anticipated testing dates, and the
owner's or operator's plans to record and report the MIT results.
3.1.6 A pressure fall-off test
Pressure fall-off tests are designed to verify that pressure declines agree with modeled
projections of reservoir pressure changes, in addition to providing information about formation
characteristics (e.g., transmissivity and injectivity). A pressure fall-off test must be performed
every five (5) years, unless more frequent testing is required by the UIC Program Director [40
CFR 146.90(f)]. However, the owner or operator may set the testing schedule to coincide with
scheduled well workovers or other testing or maintenance. EPA recommends that the owner or
operator and the UIC Program Director discuss what conditions may trigger the need for more
frequent pressure fall-off testing. See the Draft UIC Program Class VI Well Testing and
Monitoring Guidance for additional information about performing pressure fall-off tests.
EPA recommends that the Testing and Monitoring Plan describe the pressure fall-off tests to be
employed, the associated quality assurance and surveillance measures, anticipated testing dates,
and how the owner or operator plans to record and report the results.
3.1.7 Carbon dioxide plume and pressure front tracking
Owners or operators must perform testing and monitoring to track the extent of the carbon
dioxide plume and the presence or absence of elevated pressure, i.e., the pressure front [40 CFR
146.90(g)]. This monitoring provides information about the rate and direction of carbon dioxide
plume and pressure front movement, demonstrates that formation pressures are stable, and
verifies that the injectate is safely confined (or provides early warning that it is not).
The purpose of this requirement is to ensure that the owner or operator and the UIC Program
Director know, and discuss, the position of the carbon dioxide plume and pressure front during
the lifetime of the GS project. This is necessary to ensure that carbon dioxide and/or mobilized
formation fluids are not endangering USDWs or migrating in a manner contrary to the initial
estimates generated by the AoR delineation modeling. Ongoing monitoring data must also be
used to inform AoR reevaluations.
All owners or operators must use direct methods to monitor the pressure front and determine the
presence or absence of elevated pressure in the injection zone [40 CFR 146.90(g)(l)]. Owners or
operators may also find it useful to perform pressure monitoring in ground water quality
monitoring wells (i.e., in the first permeable formation above the confining zone). This could
provide additional data to verify confinement without the construction of additional monitoring
wells. See Section 3.1.4 of this guidance document for additional information on the use and
benefits of multiple-purpose monitoring wells.
Class VI injection well owners or operators must use indirect methods (e.g., seismic, electrical,
gravity, or electromagnetic surveys) to track the carbon dioxide plume, unless the UIC Program
Director determines, based on the site-specific geology, that such indirect methods are not
feasible [40 CFR 146.90(g)(2)]. If indirect geophysical techniques cannot be used to track the
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plume at a sufficient resolution, the UIC Program Director may require direct geochemical
sampling for tracking of the carbon dioxide plume in the injection zone.
Various subsurface indirect monitoring techniques are available to track the extent of a carbon
dioxide plume, including seismic and electrical methods. EPA recommends that the owner or
operator discuss with the UIC Program Director the use and feasibility of indirect geophysical
methods, including which methods are most appropriate based on site-specific geologic
information. If the owner or operator believes that no indirect plume tracking methods are
feasible, it is important that this be discussed with the UIC Program Director early in the
planning process. The Draft UIC Program Class VI Well Testing and Monitoring Guidance
provides detailed information on carbon dioxide plume and pressure front tracking methods.
The Testing and Monitoring Plan must describe which direct and indirect tracking methods will
be used. This might include pressure monitoring locations, the types of indirect surveys to be
performed, their resolution, and the areal extent of geophysical surveys. The associated quality
assurance and surveillance measures must also be included in the plan. It is important that the
plan describe the testing frequency, how site access will be guaranteed, and how the owner or
operator plans to record and report the results.
EPA recommends that owners or operators consider and include the following in developing the
plan for carbon dioxide plume and pressure front tracking:
The predicted size and shape of the AoR, which would affect the pressure monitoring
locations and the areal extent of geophysical surveys;
Any site-specific geologic conditions that inform what indirect geophysical techniques
may be used, including the presence of any features that may impact the feasibility of
geophysical methods;
The presence of multiple subsurface layers that are defined as USDWs, which may
affect the placement of pressure monitoring wells;
Whether an injection depth waiver is sought. This would necessitate additional
geochemical monitoring or pressure monitoring, both above the upper confining zone and
below the lower confining zone;
The presence of other injection operations, which may impact pressure changes in the
subsurface; and
The presence, location, and construction of any additional wells at the site, including
monitoring wells, which may be used for plume and pressure-front tracking.
3.1.8 Surface air and/or soil gas monitoring (if required)
The Class VI Rule provides the UIC Program Director discretion to require surface air and/or
soil gas monitoring to detect movement of carbon dioxide that could endanger a USDW [40 CFR
146.90(h)]. All surface air and/or soil gas monitoring must be based on potential risks to USDWs
within the AoR.
The UIC Program Director's decision to require surface air and/or soil gas monitoring and the
selection of monitoring methods will be site-specific (e.g., based on geology or injection depth).
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Therefore, it is important that the owner or operator and UIC Program Director discuss the
proposed Testing and Monitoring Plan and the site characterization data collected as the plan is
developed. This dialogue can support a UIC Program Director's determination as to whether any
surface air and/or soil gas monitoring is necessary to protect USDWs from endangerment. The
owner or operator should consider what baseline surface air and/or soil gas monitoring data may
need to be collected prior to the commencement of injection activities.
If the UIC Program Director requires the installation and use of surface air and/or soil gas
monitoring technologies, Class VI well owners or operators may demonstrate that monitoring
employed under Subpart RR of the Greenhouse Gas Reporting Program [40 CFR 98.440 to
98.449] meets the requirements of the Class VI Rule at 40 CFR 146.90(h)(3). Where the UIC
Program Director approves the use of monitoring employed under Subpart RR, Class VI well
owners or operators may use the same technologies as they will employ to comply with Subpart
RR and present this as part of the Testing and Monitoring Plan. Compliance with these 40 CFR
Part 98 requirements is considered a condition of the Class VI permit if surface air and/or soil
gas monitoring is required by the UIC Program Director [40 CFR 146.90(h)(3)], and the UIC
Program Director approves the use of monitoring employed under Subpart RR.
If surface air and/or soil gas monitoring is determined by the UIC Program Director to be
necessary, then the owner's or operator's Testing and Monitoring Plan must describe how the
proposed monitoring will yield useful information for the AoR delineation and/or for compliance
with standards that prevent movement of fluids to USDWs under 40 CFR 144.12 [40 CFR
146.90(h)(2)]. The Testing and Monitoring Plan must also describe the carbon dioxide
monitoring techniques and equipment, quality assurance and surveillance measures, monitoring
locations (including how the owner or operator will access the monitoring sites), monitoring
frequency (e.g., anticipated dates), and how the owner or operator plans to record and report the
results. See the Draft UIC Program Class VI Well Testing and Monitoring Guidance for
additional information on surface air and/or soil gas monitoring technologies. The owner or
operator should also consider the requirements of 40 CFR Part 98 when developing this
particular aspect of the Testing and Monitoring Plan.
The Subpart RR General Technical Support Document (TSD) provides additional technical
information on the required testing and monitoring under Subpart RR. A copy of the Subpart RR
TSD is available at http://www.epa.gov/climatechange/emissions/downloadslO/Subpart-RR-
UU TSD.pdf. For additional information on Subpart RR under 40 CFR Part 98, see
http://www.epa.gov/climatechange/emissions/subpart/rr.html.
EPA recommends that the owner or operator and the UIC Program Director discuss and consider
the following in determining whether surface air and/or soil gas monitoring is needed or when
developing the plan:
The presence or proximity of USDWs that could be endangered, which will drive the
need for this monitoring;
Baseline geologic information regarding the existence and location of any fractures,
faults, or other discontinuities that could serve as conduits for fluid and/or gas movement;
Baseline geochemical data (e.g., background natural carbon dioxide concentrations);
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The pace of development or land use changes in the region, which would drive
monitoring locations (e.g., the need to monitor near structures or populated areas); and
Public input and concerns, including environmental justice considerations. A robust
monitoring scheme that includes surface air and/or soil gas monitoring for carbon dioxide
may be one component of local acceptance of the project.
3.1.9 Any additional monitoring required by the VIC Program Director
The Class VI Rule provides the UIC Program Director discretion to require the owner or
operator to perform any additional monitoring necessary to support, upgrade, and improve
computational modeling of the AoR, and to determine compliance with standards that prevent
movement of fluids into USDWs [40 CFR 146.90(1)].
Another monitoring technique that may be applicable at a GS project is the use of tracers. These
may include stable isotopes of carbon and oxygen, perfluorocarbon, or radioactive tracers.
Tracers can be useful tools for monitoring, plume tracking, and verification at GS sites and may
help improve public confidence in certain projects. However, tracer use is not appropriate in all
situations. For this reason, they are not required at all GS sites, although the UIC Program
Director has the discretion to require their use if he/she determines that using tracers is necessary
to support, upgrade, and improve computational modeling of the AoR required under 40 CFR
146.84(c) or to determine compliance with standards under 40 CFR 144.12. Another example of
additional monitoring is, based on the results of indirect methods, using direct methods for
geochemical sampling for tracking of the carbon dioxide plume in the injection zone (see Section
3.1.7).
EPA recommends that, while developing the plan, the owner or operator discuss the proposed
Testing and Monitoring Plan and the site characterization data collection process with the UIC
Program Director in order to determine whether any additional monitoring would be necessary at
the proposed Class VI injection well site. If the UIC Program Director requires additional testing
and monitoring, the plan must describe the testing techniques, equipment to be used and the
associated quality assurance and surveillance measures, testing frequency (e.g., anticipated test
dates), and how the owner or operator plans to record and report the results [40 CFR 146.90].
3.2 UIC Program Director's Evaluation of the Testing and Monitoring Plan
The UIC Program Director must evaluate the proposed Testing and Monitoring Plan, along with
the geologic and proposed operating data submitted with the Class VI permit application, to
determine whether to approve the plan. Therefore, the owner or operator must demonstrate, to
the satisfaction of the UIC Program Director, that the proposed plan will be sufficient to meet the
requirements of 40 CFR 146.90 and account for all site-specific conditions to ensure that
USDWs are protected from endangerment. For example, the UIC Program Director may consider
the following:
Is the planned testing and monitoring sufficiently robust (e.g., the proposed frequency,
location, parameters) to provide early warning if USDWs are endangered or when emergency
or remedial response is needed?
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Does the proposed Testing and Monitoring Plan address all potential risks identified in the
site characterization process, e.g., all nearby USDWs or non-transmissive faults or fractures?
Will the proposed plan provide the necessary data and model inputs on which to verify
predictions of carbon dioxide plume movement and to reevaluate the AoR?
Is monitoring appropriate to address the additional risk associated with injection into non-
USDWs that are below/between USDWs if an injection depth waiver is sought?
Are the planned monitoring wells located and constructed in a way to ensure that they do not
provide a conduit for fluid movement to USDWs?
The submittal, evaluation, and approval of the Testing and Monitoring Plan are meant to be parts
of an iterative process. This may involve multiple drafts of the plan until all required information
is submitted in an appropriate format and level of detail. If the UIC Program Director has reason
to believe, based on site-specific conditions, that additional monitoring is needed to sufficiently
assess the behavior of the GS project or to protect USDWs from endangerment, it is within
his/her authority to request that additional monitoring be included. This may include more
frequent monitoring or the monitoring of additional parameters. The approved Testing and
Monitoring Plan is enforceable, whether or not it is a condition of the permit, because the plan
itself and the UIC Program Director's approval are required by the Class VI Rule [40 CFR
146.90].
Interaction and conversation are encouraged to discuss the areas of UIC Program Director's
discretion, such as more frequent monitoring or surface air and/or soil gas monitoring. Having
such discussions prior to developing and submitting the plan may increase the chance that the
proposed plan can be approved, and it may avoid the need for plan revision or future
amendments.
Appendix F of this guidance document presents a checklist of questions and considerations that
UIC Program Directors may use when evaluating the proposed Testing and Monitoring Plan and
other GS project plans. See the Draft UIC Program Class VIImplementation Manual for
additional information on how the UIC Program Director may evaluate the plan, including
exercising any discretion regarding requiring additional monitoring.
3.3 Amending the Testing and Monitoring Plan
The Class VI Rule requires that the Testing and Monitoring Plan be reviewed and, if necessary,
amended following each reevaluation of the AoR [40 CFR 146.90(j)]. The purpose of this review
is to ensure that the management of the GS project and all of the project plans are based on the
most up-to-date information available and continue to provide for the protection of USDWs from
endangerment. This review of the plan follows the required AoR reevaluation timeframe, which
must occur at least once every five (5) years. See Section 5 of the Draft UIC Program Class VI
Well AoR Evaluation and Corrective Action Guidance for additional information on performing
AoR reevaluations. The amended Testing and Monitoring Plan (or a demonstration that no
amendment is needed) is due no later than one (1) year after the reevaluation [40 CFR
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Owners or operators must use the results of the AoR reevaluation, along with monitoring data
(e.g., the results of carbon dioxide plume and pressure front tracking and ground water
monitoring); operational data (e.g., injection rates and volumes); and any newly acquired site
characterization data collected since the last AoR reevaluation, to assess the need for amending
the Testing and Monitoring Plan. The owner or operator must also review the plan if there are
significant changes to GS facility operations, such as the addition of a Class VI injection well, or
if any adverse events require the implementation of an emergency response.
EPA recommends that the owner or operator and the UIC Program Director coordinate and
discuss the most recent AoR evaluation, along with monitoring and operational data and other
information about the facility during this plan review. EPA considers this dialogue to be an
important part of the process to ensure that the GS project continues to be managed appropriately
and that compliance with the Class VI permit is achieved. These discussions can also help the
owner or operator to understand the UIC Program Director's expectations, including whether an
amended plan is needed, so that the UIC Program Director receives all the required information
up front in order to facilitate the review process.
The Sections below describe a recommended process by which the owner or operator may
review and amend the Testing and Monitoring Plan.
Step 1: Review the results of the AoR reevaluation or relevant monitoring and operational
data. The purpose of this review is to identify whether an amendment to the Testing and
Monitoring Plan is needed. Topics that may be considered in the review include:
Carbon dioxide plume and pressure front monitoring data, e.g., any changes in the size or
shape of the AoR or indications that the plume is moving differently than predicted. These
changes may indicate the need for additional monitoring locations, pressure monitoring in
more locations, or more frequent/extensive geophysical surveys. Since some variability is
expected, the owner or operator is advised to evaluate the significance of these changes and
discuss with the UIC Program Director the need for any additional testing and monitoring.
Evidence of leaching/mobilization of metals or organic constituents in the subsurface, which
may indicate a need to modify ground water monitoring parameters or analytes. An analysis
of the location of the subsurface reactions (i.e., in the injection zone) and the risks posed by
fluid movement that would require additional monitoring.
Model revisions: if the most recent AoR reevaluation necessitates a revision to the AoR
computational model, EPA recommends that the Testing and Monitoring Plan be amended to
reflect any changes to the prediction of plume and pressure front movement.
Well construction, mechanical integrity, and corrosion testing data, which may indicate the
need to modify the well testing regime, e.g., by revising MITs or corrosion monitoring
activities.
The availability of new, more site-suitable, testing and monitoring methods.
If an expansion to the areal extent of an existing Class II enhanced recovery aquifer
exemption was issued for the project, whether testing and monitoring data confirm that the
estimated extent of the exemption is adequate.
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Step 2: Discuss the results with the VIC Program Director. EPA recommends that the owner or
operator and the UIC Program Director discuss whether an amendment to the Testing and
Monitoring Plan is needed. If the AoR reevaluation and monitoring/operating data indicate that
the plume is moving as predicted, an amendment may not be necessary. The final decision
regarding the need for an amended plan will be made by the UIC Program Director.
If a review of the AoR reevaluation or other project data indicate that an amendment to the plan
is needed, then EPA recommends that work on revising the plan begin as soon as possible so that
the one (1) year deadline for amending this plan (along with any related amendments to other
project plans) can be met [40 CFR 146.90(j)(l)]. Regardless of whether a conversation with the
UIC Program Director takes place, it is recommended that the owner or operator use the site-
specific monitoring and operational data to prepare and present a recommendation for action on
an amended Testing and Monitoring Plan.
If, based on a review of all available data and information, no amendment is needed, the owner
or operator must continue to monitor the well and the site as described in the existing approved
Testing and Monitoring Plan.
Step 3: Amend the Testing and Monitoring Plan if needed, EPA recommends that the amended
Testing and Monitoring Plan include the same categories of information that were required for
the original plan that was developed before injection commenced (see Section 3.1 of this
guidance document for a description of the required plan elements). The amended plan might
incorporate the following (as appropriate):
Changes in monitoring/testing frequency, e.g., carbon dioxide stream analysis, ground water
monitoring, and carbon dioxide plume and pressure front tracking;
New monitoring well locations;
Additional parameters for ground water testing;
Changes to indirect or direct plume tracking methods, scope, or frequency;
Additional MITs or corrosion monitoring;
The addition of surface air and/or soil gas monitoring determined to be needed to protect
USDWs from endangerment; and
Any newly developed testing or monitoring procedure that was not in the approved plan.
Step 4: Submit the amended plan. The owner or operator must submit the amended plan to the
UIC Program Director for approval within one (1) year of the AoR reevaluation or within one (1)
year of any other event that triggers a Testing and Monitoring Plan review [40 CFR 146.90(j)(l)-
146.90(j)(3)]. The amended plan must be approved by the UIC Program Director and would then
be incorporated into the Class VI permit. If changes to the plan are needed, the UIC Program
Director may need to modify the Class VI permit. A permit modification under 40 CFR 144.39
(e.g., to incorporate changes to the needed types of testing, additional monitoring locations, or
new testing methods) would require an opportunity for public notification and comment. See 40
CFR Part 124 for details on the public notice and comment process. Minor changes to the plan,
as defined under 40 CFR 144.41 (e.g., to provide clarification, require more frequent ground
water sampling, or correct typographical errors), do not require a permit modification or a public
process under 40 CFR Part 124. See the Draft UIC Program Class VIImplementation Manual
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for additional information about the procedures for modification of Class VI permits and the
related plan amendments.
4.0 Injection Well Plugging Plan
Improperly plugged injection wells have the potential to become conduits for fluid movement
into USDWs. Therefore, developing, maintaining, and implementing an Injection Well Plugging
plan is important to assuring that Class VI injection wells will be plugged properly, so as to not
endanger USDWs following the cessation of injection.
Owners or operators of other injection well types may be familiar with preparing an Injection
Well Plugging Plan (also known as a plugging and abandonment plan), and EPA expects that
developing an Injection Well Plugging Plan will involve a similar effort. However, because
carbon dioxide in the presence of water has the potential to degrade the materials used to plug
the injection well, the plugging of Class VI wells presents additional challenges that may not
have been addressed in the course of plugging other classes of injection wells.
4.1 Developing the Injection Well Plugging Plan
The Class VI Rule, at 40 CFR 146.92(b), presents the required elements of an Injection Well
Plugging Plan. Developing a plugging plan is also required of Class I and Class II injection well
owners or operators. Many of the plugging procedures used by Class I and Class II well
operators may be acceptable for Class VI injection wells. However, one important consideration
is that Class VI injection wells must be plugged using methods and materials that are compatible
with the carbon dioxide stream. Additionally, EPA recommends that, when selecting plugging
materials and methods, the owner or operator consider the formation fluids and conditions to
which the materials will be exposed. Therefore, the owner or operator must demonstrate, to the
satisfaction of the UIC Program Director, that Class VI wells will be plugged in a manner that
will resist degradation in the presence of carbon dioxide or carbonic acid.
The Injection Well Plugging Plan must be submitted with the Class VI permit application for
approval by the UIC Program Director [40 CFR 146.82(a)(16)], and must include a description
of how the owner or operator will meet the Class VI injection well plugging requirements at 40
CFR 146.92.
Guidance on carrying out the approved plan (e.g., selection and emplacement of plugs and
cement) is presented in the Draft UIC Program Class VI Well Plugging, PISC, and Site Closure
Guidance. Exhibit 4 presents the highlights of that guidance document.
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Exhibit 4: Draft UIC Program Class VI Well Plugging, PISC, and Site Closure Guidance
Highlights
The Draft UIC Program Class VI Well Plugging, PISC, and Site Closure Guidance provides information describing
how to correctly plug and abandon injection wells, conduct PISC monitoring, and perform site closure activities.
Furthermore, the guidance discusses under what conditions the PISC monitoring timeframe may be lengthened or
shortened, how the owner or operator of a Class VI project will demonstrate to the UIC Program Director that the
risks posed to USDWs have been reduced during the PISC phase, and how the owner or operator will demonstrate
non-endangerment prior to site closure.
The introductory Section reviews the various phases of a GS project, and the Class VI requirements pertaining to
well plugging, PISC, and site closure. Remaining Sections of the guidance address the following topics:
Injection and monitoring well plugging;
PISC monitoring;
Demonstration of an alternative post-injection site care timeframe;
Demonstration of reduction of risks posed to USDWs;
Demonstration of non-endangerment of USDWs; and
Site closure.
For each Section, the guidance:
Explains various approaches to perform activities necessary to comply with well plugging, PISC, and site
closure requirements. Illustrative examples are provided in several cases.
Provides references to other, more comprehensive documents and published scientific literature for further
information.
Explains various approaches for how and when to report to the UIC Program Director the results of activities
related to well plugging, PISC, and site closure.
The following information must be described, to the UIC Program Director's satisfaction, in
order to ensure that the planned injection well plugging activities are sufficient to protect
USDWs from endangerment [40 CFR 146.92(b)]. Appendix C presents a sample template of an
Injection Well Plugging Plan.
Appropriate tests or measures to determine bottom-hole reservoir pressure [40 CFR
146.92(b)(l)]. The purpose of testing bottom-hole reservoir pressure is to determine the
appropriate density of plugging fluids to achieve static equilibrium prior to plug placement;
Appropriate testing methods to ensure external mechanical integrity [40 CFR 146.92(b)(2)].
An external MIT is necessary to ensure that the long-string casing and cement that are left in
the ground after the well is plugged will maintain their integrity over time. The Draft UIC
Program Class VI Well Testing and Monitoring Guidance provides additional information on
performing MITs;
The type and number of plugs to be used [40 CFR 146.92(b)(3)];
The placement of each plug, including the elevation of the top and bottom of each plug [40
CFR 146.92(b)(4)]. EPA recommends that the plan describe the placement of all plugs.
Schematics and drawings may be appropriate to demonstrate this;
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The type, grade, and quantity of material to be used in plugging [40 CFR 146.92(b)(5)]. EPA
recommends that the plan demonstrate that the cement is appropriate to withstand contact
with the carbon dioxide or acidified formation fluids; and
The method of plug placement, e.g., the balance method, retainer method, or two-plug
method [40 CFR 146.92(b)(6)].
EPA recommends that the owner or operator consider the following when developing the
Injection Well Plugging Plan:
The location and thickness of the lowermost injection zone and USDW-containing strata,
which dictate the location of all plugs;
Well construction details, particularly the depth of the bottom of the intermediate and
surface casings, which would affect the number of plugs and the types and amount of cement
needed;
Types of subsurface formations penetrated by the well and their geochemistry, which may
influence both plugging methods and the types of cement needed (for open-hole plugging).
EPA recommends drilling out the casing before plugging the well to avoid the potential for
the casing to corrode;
The composition of the carbon dioxide stream and formation fluid geochemistry,
including any geochemical changes anticipated during the post-injection period, which can
affect appropriate plugging and cementing materials; and
If the well will operate under an injection depth waiver, EPA recommends that the
Injection Well Plugging Plan describe any additional considerations to protect USDWs
below the injection zone.
4.2 UIC Program Director's Evaluation of the Injection Well Plugging Plan
The UIC Program Director must evaluate the owner's or operator's proposed Injection Well
Plugging Plan, along with the geologic site characterization data, proposed construction plans,
and proposed operating conditions that are submitted with the Class VI permit application. The
owner or operator must demonstrate, to the satisfaction of the UIC Program Director, that the
planned injection well plugging will prevent the well from serving as a conduit for fluid
movement, particularly given the corrosiveness of carbon dioxide in the presence of water.
The UIC Program Director should evaluate the proposed Injection Well Plugging Plan to verify
that all of the elements required in 40 CFR 146.92(b) are present, and that they account for all
site-specific conditions to ensure that USDWs are protected from endangerment. For example,
the UIC Program Director may evaluate the following:
Are the plugs and the cement that the owner or operator proposes to use appropriate for the
injectate and formation fluid geochemistry, including any geochemical changes anticipated
during the injection period?
Is the proposed placement of the plugs and cement appropriate based on the location of the
injection zone, any production zones, any formations with USDWs, other geologic features,
and the location of the bottom of the surface and intermediate casings?
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Is the proposed plugging plan appropriate to the planned construction of the well, e.g., to the
sizes and depths of the various casing strings or the use of horizontal drilling techniques?
Are the proposed post-injection tests of the well (e.g., MITs and bottom-hole reservoir
pressure tests) sufficient to characterize the well integrity and formation pressures?
If an injection depth waiver is to be granted, is the proposed well plugging plan designed to
protect USDWs both above and below the injection zone?
The submittal, evaluation, and approval of the Injection Well Plugging Plan may be an iterative
process, involving multiple drafts of the plan until all required information is submitted in an
appropriate format and level of detail. If the UIC Program Director has reason to believe, based
on site-specific conditions, that additional data are needed to sufficiently address risk at the site,
it is within his/her authority to request that additional information be collected or additional
activities be included in the Injection Well Plugging Plan. The approved Injection Well Plugging
Plan is enforceable, whether or not it is a condition of the permit, because the plan itself and the
UIC Program Director's approval are required by the Class VI Rule [40 CFR 146.93(a)].
Interaction and conversation between the owner or operator and UIC Program Director on the
proposed plugging methods and materials are encouraged. Such discussions prior to developing
and submitting the plan can increase the chance that the proposed plan is approved and can
minimize the need for plan revisions.
Appendix F of this guidance document presents a checklist of questions and considerations that
UIC Program Directors may use when evaluating the proposed Injection Well Plugging Plan or
other GS project plans. See the UIC Class VIProgram Implementation Manual for additional
information on how the UIC Program Director may evaluate the Injection Well Plugging Plan.
4.3 Amending the Injection Well Plugging Plan
The Class VI Rule does not require formal periodic reviews and amendments to the Injection
Well Plugging Plan throughout the injection phase (i.e., following any AoR reevaluations, as
with other project plans) because changes to this plan would not be implemented until the end of
injection activities. However, EPA suggests that owners or operators discuss with the UIC
Program Director how any changes in facility operations or any other data that would warrant
amendments to the other plans may affect the Injection Well Plugging Plan. EPA also
recommends that the owner or operator review the Injection Well Plugging Plan if there are
significant changes to the facility, such as the addition of another Class VI injection well, or if
any adverse events require an emergency response.
The Class VI Rule requires that the owner or operator submit a notice of intent to plug the
injection well to the UIC Program Director at least sixty (60) days prior to plugging [40 CFR
146.92(c)]. If any changes have been made to the original Injection Well Plugging Plan (e.g.,
based on operational and monitoring data or data collected during AoR reevaluations), the owner
or operator must submit a revised plan at the same time as providing the notice of intent [40 CFR
146.92(c)].
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Prior to plugging the injection well, owners or operators may choose to consider the operational
and monitoring history of the facility and identify whether any information or events warrant
amendment of the Injection Well Plugging Plan. Data that may be considered include:
Monitoring data related to chemistry of the carbon dioxide plume and formation fluids;
MIT results, including any mechanical integrity problems that may have occurred during the
injection phase;
Operational data (e.g., injection rates and volumes); and/or
Any significant changes to the facility that may affect plugging of the injection well.
EPA encourages early interaction if the owner or operator or the UIC Program Director believe
that changes to the Injection Well Plugging Plan are needed to ensure that the well is properly
plugged in a manner that will be protective of USDWs. These discussions can also help the
owner or operator understand the UIC Program Director's expectations for the process. If the
Injection Well Plugging Plan requires amendment, such open communication between the owner
or operator and the UIC Program Director can improve the chances that the amended plan will be
approved with as few revisions as possible.
EPA recommends that the amended Injection Well Plugging Plan include the same type of
information that was included in the original plan developed before injection commenced (see
Section 4.1 of this guidance document for a description of the required elements). The amended
plan must be approved by the UIC Program Director, and would then be incorporated into the
permit. If changes to the plan are necessary, the UIC Program Director may need to modify the
permit. A permit modification under 40 CFR 144.39 (e.g., to incorporate significant changes to
planned injection well plugging activities because the initially planned activities were later
determined to be inadequate) would require notification to the public and an opportunity for
comment. See 40 CFR Part 124 for the details on the process. Minor changes to the plan, as
defined under 40 CFR 144.41 (e.g., to provide clarification or correct typographical errors), do
not require a permit modification or a public process under 40 CFR Part 124. See the Draft UIC
Program Class VI Implementation Manual for additional information about the procedures for
modification of Class VI permits and the related plan amendments.
5.0 Post-Injection Site Care (PISC) and Site Closure Plan
Following cessation of injection activities, Class VI injection well owners or operators must
conduct comprehensive site monitoring until the owner or operator can demonstrate to the UIC
Program Director that the GS project does not pose a risk of endangerment to USDWs. The PISC
requirements for GS projects incorporate a combination of both a fixed timeframe and a
performance standard approach that recognizes that carbon dioxide plumes and associated
pressure fronts may continue to move in the subsurface for long periods of time, while
accounting for the variety of site-specific circumstances that may be brought to bear on
determining the appropriate duration of PISC [40 CFR 146.93].
The Class VI injection well PISC and Site Closure Plan will ensureprior to commencement of
carbon dioxide injectionthat the owner or operator and the UIC Program Director agree on the
procedures that need to be implemented to confirm that site monitoring continues after injection
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operations cease. The plan will also help ensure that appropriate procedures are in place to
protect USDWs from endangerment. Development of the PISC and Site Closure Plan will
facilitate the identification of the appropriate types and amounts of data needed to determine that
the injected fluid and the carbon dioxide plume and pressure front do not endanger USDWs, and
it will support a determination of the conditions that warrant an end to PISC (i.e., the GS project
no longer poses an endangerment to USDWs) [40 CFR 146.93(a)].
5.1 Developing the Post-Injection Site Care and Site Closure Plan
The Class VI Rule, at 40 CFR 146.93(a), presents the required elements of a PISC and Site
Closure Plan. Owners or operators must submit a PISC and Site Closure plan that outlines the
proposed post-injection monitoring strategies and how non-endangerment of USDWs will be
ensured throughout the PISC period.
EPA suggests that, in developing the PISC and Site Closure Plan, owners or operators consider
how non-endangerment will be demonstrated (i.e., what post-operational monitoring data will be
needed to make this demonstration), and develop a plan that collects an appropriate amount and
the appropriate types of data. EPA also recommends that owners or operators consider how the
data collected during PISC will eventually inform a non-endangerment demonstration and ensure
that enough data are generated (i.e., a sufficient history) to make a satisfactory demonstration.
Guidance on how to perform the activities to be carried out under the approved PISC and Site
Closure Plan (e.g., performing the necessary monitoring) will be presented in the Draft UIC
Program Class VI Well Plugging, PISC, and Site Closure Guidance, available at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm. Exhibit 4 of this guidance
document presents the highlights of the Draft UIC Program Class VI Well Plugging, PISC, and
Site Closure Guidance.
The PISC and Site Closure Plan must be submitted with the Class VI permit application for
approval by the UIC Program Director [40 CFR 146.82(a)(17)], and it must include a description
of how the owner or operator will meet the requirements of 40 CFR 146.93(a). The Sections
below provide a description of the required elements, how they may be described in the plan to
demonstrate to the UIC Program Director's satisfaction that the plan is sufficient, and
considerations for owners or operators as they develop the plan. Appendix D of this guidance
document presents a sample template of a PISC and Site Closure Plan.
5.1.1 Pre-injection and predicted post-injection pressure differentials in the injection
zone
The PISC and Site Closure Plan must include a prediction of the magnitude of the pressure
differential between pre-injection and post-injection [40 CFR 146.93(a)(2)(i)]. These predictions
are integral to estimating the risk of endangerment to USDWs and, therefore, the amount of
monitoring that will be necessary throughout the PISC timeframe. Pressure differential plots
should be provided at various locations within the AoR as a function of time.
Predictions of pressure differential will be provided by the computational modeling performed
for the AoR delineation (see Section 2.1 of this guidance document). As with the AoR
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delineation, estimates of pressure decline should be based on site-specific geologic data (e.g.,
injection zone permeability, compressibility, the volume of the formation, and the presence of
lateral strati graphic confining features) and the planned injection volumes and rates.
5.1.2 Predicted position of the carbon dioxide plume and pressure front at site
closure
Also, the PISC and Site Closure Plan must include the predicted position of the carbon dioxide
plume and associated pressure front at site closure, as demonstrated by the AoR reevaluation
process [40 CFR 146.93(a)(2)(ii)]. Site closure refers to the point at the end of PISC, following a
demonstration that fluid movement has slowed and pressures have declined to the point that there
is no longer a risk of endangerment to USDWs from the carbon dioxide injection activities.
These predictions are integral to determining the area(s) where there may be a risk of
endangerment to USDWs during PISC and, therefore, the area(s) that must be subject to PISC
monitoring. These predictions should be presented as information overlain on regional base
maps.
The predictions of the extent of the carbon dioxide plume and pressure front will be provided by
the computational modeling performed for the AoR delineation and reevaluations under 40 CFR
146.84(b); see Section 2.1 of this guidance document. It is expected that the owner or operator
would use these modeling results in order to comply with this plume position prediction
requirement. As with the AoR delineation, these plume predictions should be based on the site-
specific geologic data (e.g., injection zone permeability, compressibility, the volume of the
formation, and the presence of lateral strati graphic confining features), and planned injection
volumes and rates.
5.1.3 Monitoring location, methods, and proposed frequency
The PISC and Site Closure Plan must describe the owner's or operator's planned monitoring
regime to be conducted following the cessation of injection [40 CFR 146.93(a)(2)(iii)]. In
general, it is recommended that post-injection monitoring be an extension of relevant
operational-phase monitoring activities, including ground water monitoring and carbon dioxide
plume and pressure front tracking.
In the early post-injection phase, it may be appropriate to continue monitoring at the same
locations, parameters, and frequency as specified in the operational-phase Testing and
Monitoring Plan. Thus, the PISC and Site Closure Plan may resemble certain aspects of the
Testing and Monitoring Plan (see Section 3 of this guidance document). Reduced monitoring
frequencies and parameters may be appropriate as the owner or operator demonstrates, based on
monitoring data, that movement of the carbon dioxide plume and pressure front is slowing and
that there are no adverse changes in ground water geochemistry that could indicate that USDWs
are being endangered. Conversely, if there is evidence of changes in ground water chemistry or
plume movement, additional monitoring may be warranted.
As with injection-phase monitoring, appropriate monitoring technologies may vary depending on
site-specific conditions; therefore, the techniques used to collect and interpret this data are not
specified in the Class VI Rule. In developing a post-injection monitoring regime, EPA
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recommends that the owner or operator consider what data will be needed as inputs for the non-
endangerment demonstration. That demonstration will need to be based on a sufficient
monitoring history to demonstrate that pressures have declined and that there is no risk of
endangerment to USDWs from GS activities.
5.1.4 Schedule for submitting post-injection site care monitoring results
The owner or operator must propose, in the PISC and Site Closure Plan, an appropriate schedule
for reporting all testing and monitoring results collected during the post-injection monitoring
phase [40 CFR 146.93(a)(2)(iv)]. The owner or operator and the UIC Program Director may
wish to consider the submittal of these reports as an opportunity to discuss the rate of fluid
movement, pressure changes, and any other significant processes within the subsurface, as well
as whether modifying the testing frequency is appropriate.
Many of the considerations applied in developing the operational-phase Testing and Monitoring
Plan may also be used in planning for post-injection site monitoring. Discussions between the
owner or operator and the UIC Program Director are encouragedas the PISC and Site Closure
Plan is developed, and as PISC monitoring proceeds.
5.1.5 Demonstration of an alternative post-injection site care timeframe
At the UIC Program Director's discretion, the owner or operator may demonstrate during the
permitting process that an alternative post-injection site care timeframe, other than the 50 year
default, is appropriate and ensures non-endangerment of USDWs [40 CFR 146.93(a)(2)(v)].
To be acceptable to the UIC Program Director, the demonstration should be based on site-
specific information, including the results of site-specific computational modeling; the predicted
timeframe for pressure decline; the predicted rate of carbon dioxide plume migration; site-
specific chemical processes that will result in carbon dioxide trapping; the predicted rate of
carbon dioxide trapping; characterization of the confining zone(s); laboratory analyses or studies
to verify the information on trapping; the presence of potential conduits for fluid movement and
the quality of abandoned well plugs within the AoR; the distance between the injection zone and
USDWs above and/or below the injection zone; and any additional site-specific factors
determined by the UIC Program Director.
The demonstration must meet the criteria at 40 CFR 146.93(c)(2) for ensuring the quality and
accuracy of the data and models on which the demonstration is based. This demonstration would
be submitted as part of the permit application, per 40 CFR 146.82(a)(18), in addition to the PISC
and Site Closure Plan. The PISC and Site Closure Plan would reference this demonstration and
include information about the appropriate alternative timeframe, if applicable.
The following factors may be considered and included in developing the PISC and Site Closure
Plan:
The predicted size and shape of the AoR, which would affect the number and location of
monitoring wells or the extent of geophysical surveys;
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Predicted pressure changes during and following injection, e.g., the rate at which pressures
are predicted to decline, which would impact appropriate testing frequencies;
The site characteristics, depth and proximity of USDWs, and the depth and thickness of the
confining zone(s), which may affect the amount of monitoring needed;
Baseline subsurface aqueous- and solid-phase geochemistry at the site and the composition
of the carbon dioxide, which would impact ground water monitoring needs; and
Planned information needs for non-endangerment demonstrations for determining the
end of the PISC period.
5.1.6 Information that will Support the Non-Endangerment Demonstration
EPA recommends that owners or operators include in the PISC and Site Closure Plan a
discussion of what data will inform the non-endangerment demonstration at the end of post-
injection site care and how the owner or operator envisions the non-endangerment demonstration
will be developed. This section of the Plan may take the form of a rough outline of the
information that will comprise the non-endangerment demonstration, e.g., trends in subsurface
pressures or certain ground water monitoring data and may include predicted values based on
project-specific information and modeling. Such a discussion would allow the owner or operator
and the UIC Program Director to agree, up front, on the types of project data that will be
collected and used to indicate that the carbon dioxide plume is stabilizing and there is no further
risk of endangerment to USDWs. This approach would ensure that the data the owner or operator
plans to collect (e.g., the types of data described in Section 5.1.5) will be of the appropriate type
and frequency to provide sufficient data to inform a demonstration that site closure is
appropriate.
5.1.7 Site Closure Plan
EPA recommends that owners or operators also describe in their PISC and Site Closure Plan how
they plan to close the site following the conclusion of the PISC period. Site closure activities
may include: plugging all monitoring wells, removing all surface equipment, and restoring the
site to its prior condition (e.g., planting vegetation).
The primary activity associated with site closure is plugging all monitoring wells in a manner
that will not allow movement of injection or formation fluids that endangers a USDW [40 CFR
146.93(e)]. An improperly abandoned monitoring well poses as great a threat to USDWs as an
improperly abandoned injection well. EPA anticipates that plugging monitoring wells will
involve similar activities as those required for plugging the injection well(s), i.e., flushing the
well with a buffer fluid, testing the external mechanical integrity of the well, and emplacing
cement in the well in a manner that will prevent fluid movement that may endanger USDWs.
Owners or operators may consider the same types of information in planning the closure of
monitoring wells as they did for plugging the injection well: well depth and construction; the
location, type, and depth of subsurface formations penetrated; and how the composition of the
carbon dioxide may impact plugging materials. See Section 4.1 of this guidance document and
the Draft UIC Program Class VI Well Plugging, PISC, and Site Closure Guidance for additional
information on well plugging.
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5.2 UIC Program Director's Evaluation of the Post-Injection Site Care and Site Closure
Plan
The UIC Program Director will evaluate the owner's or operator's proposed PISC and Site
Closure Plan, along with the geologic and proposed operating data submitted with the Class VI
permit application. Therefore, the owner or operator must demonstrate in the proposed PISC and
Site Closure Plan, to the satisfaction of the UIC Program Director, that the planned PISC will be
adequate to detect any endangerment to USDWs from injection operations.
The UIC Program Director should evaluate the proposed PISC and Site Closure Plan to verify
that all required elements as described in 40 CFR 146.93(a) are present and that they account for
all site-specific conditions to ensure that USDWs are protected from endangerment. For
example:
Are predictions of pressure decline and fluid movement consistent with AoR modeling and
do they accurately reflect geologic and operating data?
Is the proposed carbon dioxide plume and pressure front tracking appropriate to the predicted
changes in subsurface conditions during post-injection?
Is the proposed post-injection monitoring (e.g., ground water quality monitoring) adequate to
provide early warning of USDW endangerment?
If an alternative PISC timeframe is proposed, does substantial data exist to demonstrate that
an alternative timeframe would be protective of USDWs and does it meet the criteria at 40
CFR 146.93(c)(2)?
EPA envisions that the submittal, evaluation, and approval of the PISC and Site Closure Plan
will be an iterative process. This may involve multiple rounds of drafts until all required
information is submitted in an appropriate format and level of detail. In particular, if the owner
or operator plans to demonstrate that an alternative PISC timeframe is appropriate, it is
recommended that they discuss this with the UIC Program Director, including the types of data
that are available to support the demonstration. The demonstration must be submitted as part of
the permit application [40 CFR 146.82(a)(18)], and the timeframe must be incorporated into the
PISC and Site Closure Plan. If the UIC Program Director has reason to believe (e.g., based on
site-specific conditions) that additional data are needed to sufficiently address the risks at the site
during the post-injection phase, it is within his or her authority to request that additional
monitoring be performed. The approved PISC and Site Closure Plan is enforceable, whether or
not it is a condition of the permit, because the plan itself and the UIC Program Director's
approval are required by the Class VI Rule [40 CFR 146.93(a)].
Interaction and conversation about the proposed monitoring and other site care activities are
encouraged. In particular, it is important that the owner or operator discuss with the UIC
Program Director how he or she plans to demonstrate a reduction in risk to USDWs posed by the
GS project during the PISC period. Such demonstrations can support reductions in the frequency
of PISC monitoring or reduce the PISC monitoring timeframe (i.e., by allowing non-
endangerment to be demonstrated in less than 50 years after the cessation of injection). EPA
recommends that the owner or operator discuss the anticipated data that will be used and how it
will be presented and analyzed. For more information on performing the non-endangerment
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demonstration, see the Draft UIC Program Class VI Well Plugging, PISC, and Site Closure
Guidance.
The owner or operator must notify the UIC Program Director, in writing, of their intent to close
the site at least 120 days prior to site closure and cessation of PISC activities [40 CFR
146.93(d)]. At this time, the owner or operator should submit to the UIC Program Director any
changes to the PISC and Site Closure Plan.
Appendix F of this guidance document presents a checklist of questions and considerations that
UIC Program Directors may use when evaluating the proposed PISC and Site Closure Plan and
other GS project plans. See the Draft UIC Program Class VIImplementation Manual for
additional information on how the UIC Program Director might evaluate the PISC and Site
Closure Plan.
5.3 Amending the Post-Injection Site Care and Site Closure Plan
Upon cessation of injection, the Class VI Rule requires that owners or operators either submit an
amended PISC and Site Closure Plan or demonstrate to the UIC Program Director, through
monitoring data and modeling results, that no amendment to the plan is needed [40 CFR
146.93(a)(3)].
The Class VI Rule does not require formal periodic reviews and amendments to the PISC and
Site Closure Plan during the injection phase (i.e., following AoR reevaluations, as with other
project plans), because it is not expected that changes to this plan would be implemented until
the end of injection activities. However, if any changes in facility operations or monitoring or
operational data warrant changes to other GS project plans, EPA recommends that the owner or
operator consider discussing the PISC and Site Closure Plan and potential impacts to planned
PISC and site closure activities with the UIC Program Director. If any adverse events or a
significant deviation from predicted performance occur, the UIC Program Director may require a
review of the PISC and Site Closure Plan. EPA recommends that the owner or operator also
undertake a review of the plan if there are significant changes to the facility, such as the addition
of an injection well, or if any adverse events requiring the implementation of an emergency
response occur.
During the post-injection monitoring phase, EPA
expects the owner or operator to continue to
review the PISC and Site Closure Plan. As the
owner or operator performs post-injection
monitoring, they may take into account similar
considerations that guide amendments to the
other project plans. For example, if carbon
dioxide plume and pressure front tracking data
indicate a divergence from modeled predictions
or ground water monitoring data indicates
leaching/ mobilization of contaminants (or reductions in previously observed reactions), an
amendment to the PISC and Site Closure Plan may be appropriate.
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The PISC Timeframe
The Class VI Rule sets a default timeframe of
fifty (50) years of PISC, and it affords the UIC
Program Director the discretion to shorten the
PISC timeframe if the owner or operator can
demonstrate that there is substantial evidence that
the GS project no longer poses a risk of
endangermentto USDWs [§146.93(b)].
Likewise, the UIC Program Director may
lengthen the PISC timeframe if, after fifty (50)
years, USDWs still may become endangered.
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The purpose of reviewing the PISC and Site Closure Plan is to consider:
Whether post-injection site care is adequate to ensure that USDWs are protected from
endangerment from carbon dioxide injection activities (or provide early warning of potential
endangerment);
Whether changes to monitoring are needed, e.g., if the types of monitoring can be reduced as
data indicate post-injection stabilization of the carbon dioxide plume and pressure front; and
Whether appropriate amounts and types of data are being collected to support an eventual
non-endangerment demonstration, and whether making this demonstration before the
required fifty (50) year PISC timeframe is appropriate. The UIC Program Director may
determine whether a shorter or longer PISC timeframe is necessary.
The owner or operator may choose to amend the PISC and Site Closure Plan if monitoring or
operational data indicate that changes to the PISC timeframe are warranted. The owner or
operator may, at any time during the life of the project, submit information to support a revised
PISC timeframe other than the initial or previously approved timeframe in the PISC and Site
Closure Plan. This demonstration must be based on monitoring and operational data collected
during site operations and modeling of the extent of the carbon dioxide plume and pressure front.
EPA recommends that, if the owner or operator opts to revise their PISC timeframe as part of a
PISC and Site Closure Plan update, they submit information that meets all of the criteria at 40
CFR 146.93(c) to demonstrate that the timeframe is appropriate and protective of USDWs.
This option is available to either amend an alternative PISC timeframe that was included in the
original PISC and Site Closure Plan submitted with the Class VI permit application or to justify
that a revised timeframe is appropriate if the Class VI permit included the default PISC
timeframe. If the UIC Program Director approves the revised PISC timeframe, it would be
incorporated into the PISC and Site Closure Plan and the Class VI operating permit. Such a
change would require the UIC Program Director to modify the Class VI permit. A permit
modification under 40 CFR 144.39 would require notification to the public and an opportunity
for comment.
As discussed earlier, the Class VI Rule does not set a required frequency or a schedule for the
review of the PISC and Site Closure Plan during the PISC phase. However, EPA encourages the
owner or operator and UIC Program Director to discuss the monitoring data collected during the
PISC phase in order to identify whether amendments to the plan are needed. These discussions
can coincide with the reporting schedule identified in the owner or operators original PISC and
Site Closure Plan [40 CFR 146.93(a)(2)(iv)].
EPA encourages the owner or operator and the UIC Program Director to coordinate and discuss
monitoring data and other information about the facility throughout PISC, particularly if the
owner or operator seeks to amend the PISC timeframe. This dialogue is an important part of the
process to ensure that the GS project is (and continues to be) managed appropriately to protect
USDWs and that compliance with the Class VI operating permit is achieved. These discussions
can also help the owner or operator understand the UIC Program Director's expectations,
including whether an amended PISC and Site Closure Plan is needed and, if so, improve the
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chance that the amended plan will be approved by the UIC Program Director with minimal
revisions.
If any changes to the original PISC and Site Closure Plan are needed at the time of cessation of
injection, the owner or operator must submit an amended PISC and Site Closure Plan for the UIC
Program Director's approval within thirty (30) days of making the changes [40 CFR
146.93(a)(4)]. If the UIC Program Director determines that a plan amendment is needed during
the post-injection phase, the owner or operator and UIC Program Director are encouraged to
agree on a schedule for submittal of the amended PISC and Site Closure Plan.
If an amendment is needed, the amended PISC and Site Closure Plan may include the same type
of information that was included in the original plan developed and submitted with the Class VI
permit application (see Section 5.1 of this guidance document for a description of the required
plan elements).
Any amendments to the PISC and Site Closure Plan (either at the time of cessation of injection
or during the PISC phase) must be incorporated into the Class VI operating permit once the
amendments are approved by the UIC Program Director. If changes to the plan are needed, the
UIC Program Director may need to modify the permit. A permit modification under 40 CFR
144.39 (e.g., to incorporate a plan with changes to the initially planned types of monitoring or an
expansion of the area covered by post-injection monitoring, or to establish or revise the
alternative PISC timeframe) would require notification to the public and an opportunity for
comment. Minor changes to the plan, as defined under 40 CFR 144.41 (e.g., to provide
clarification or correct typographical errors), do not require a permit modification or a public
process under 40 CFR Part 124. See the Draft UIC Program Class VIImplementation Manual
for additional information about the procedures for modification of Class VI permits and the
related plan amendments.
6.0 Emergency and Remedial Response Plan
While the goals of proper siting, construction, and operation of a GS project are to prevent the
occurrence of an emergency or adverse event, advance planning is vital for mitigating the effects
of such an event, if it should ever occur. The Emergency and Remedial Response Plan helps
ensure that in the unlikely event of an emergency or USDW endangerment, an approved process
is implemented in order to facilitate and expedite the necessary and appropriate response efforts.
Evidence of advance planning can also allay public concerns about the project's safety. The
Emergency and Remedial Response Plan will apply over the life of the GS project, including
throughout the PISC period [40 CFR 146.94(a)].
The purpose of requiring an Emergency and Remedial Response Plan is to ensure that owners or
operators can comprehensively plan for what actions would be necessary in the unlikely event of
an emergency. The plan will also ensure that operators know which entities and individuals are
to be notified, and what actions need to be taken, to expeditiously mitigate any emergency
situations and protect USDWs from endangerment.
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6.1 Developing the Emergency and Remedial Response Plan
The Class VI Rule, at 40 CFR 146.94(a), requires that the Emergency and Remedial Response
Plan describe the measures that would be taken in the event of adverse conditions at a GS
project, such as a loss of the well's mechanical integrity, or if movement of injection or
formation fluids caused an endangerment to a USDW. The Emergency and Remedial Response
Plan must be submitted with the Class VI permit application for approval by the UIC Program
Director [40 CFR 146.82(a)(19)]. It must include a description of how the owner or operator will
meet the requirements of 40 CFR 146.94, and it must demonstrate, to the satisfaction of the UIC
Program Director, that in the event of an emergency, the appropriate response actions would be
performed in a timely manner to prevent or mitigate any damage to USDWs.
The Class VI Rule does not identify the specific elements of the Emergency and Remedial
Response Plan. EPA envisions that each plan will be site-specific and risk-based, and depend on
a variety of factors, including the nature of any movement of carbon dioxide or other fluids, the
presence of USDWs, and what, if any, impacts could result from carbon dioxide movement into
unintended zones, carbon dioxide leaks, or ground water or surface water contamination.
This Section describes an EPA-recommended process that an owner or operator may undertake
in developing an Emergency and Remedial Response Plan. This approach includes
considerations of site-specific factors, potential risk scenarios to USDWs or resources, and
appropriate response actions and personnel. Appendix E of this guidance document presents a
sample template for an Emergency and Remedial Response Plan. For more information on
conducting outreach and communicating with the public on any potential Class VI injection well
project, see the Public Participation Considerations for Geologic Sequestration Projects Fact
Sheet, available on EPA's website at
http://water.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm. The steps recommended for
developing an Emergency and Remedial Response Plan include the following:
1. Identify and list resources/infrastructure. EPA recommends that the plan identify all
potentially impacted environmental resources (e.g., ground water or surface water) or
infrastructure (e.g., the well or nearby structures) near the well; such information will be of
interest to the public. This list may be based on site-specific data collected in the site
characterization and AoR processes.
Potentially impacted resources or infrastructure near Class VI injection wells may include:
the injection well, any public water systems, private drinking water wells, other deep wells
within the AoR, aquifers and USDWs, surface water bodies, the soil column, buildings or
other structures, biosphere/ecosystems, the atmosphere, and the geosphere.
2. Identify potential risk scenarios. EPA recommends that the plan consider, for each
identified resource or infrastructure element potentially at risk, any potential adverse events
that may occur (e.g., a well blowout, unanticipated/emergency corrective action on deficient
wells in the AoR, equipment failure, fluid movement, metals leaching, contamination of the
water supply, earthquakes/land deformation, or carbon dioxide seeps into buildings that
endanger occupants). The purpose of this analysis is to consider the "worst case" scenarios
and to ensure that response plans are in place for all eventualities. If the responses would be
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similar (e.g., if any type of damage to the well would be addressed by engaging the services
of an environmental contractor), it may be appropriate to describe categories of risks.
The Emergency and Remedial Response Plan may also consider whether the likelihood of
the event is high, medium, or low, and tier the actions in the plan accordingly. For example,
if baseline geochemical analyses indicate that there are no constituents in the rock matrix that
could be potentially mobilized as a result of carbon dioxide exposure, ground water
contamination from injection activities may be considered a low-risk scenario. However, it is
still important that the scenario be considered and included in the plan.
3. Describe response actions to address the identified risk scenarios, e.g., remedial cementing
of the well or treatment of ground water or drinking water supplies. Some situations may
require an immediate response (e.g., shutting down the well), while other "non-immediate"
actions would occur following consultation with the UIC Program Director. The proposed
response actions should be tied to planned testing and monitoring so that the owner or
operator can quickly respond to any endangerment detected at the site.
High-impact risk scenarios may warrant special consideration in the Emergency and
Remedial Response Plan. For example, if all residents in the vicinity of the well rely on one
USDW for their drinking water supply, the plan might highlight how the owner or operator
would respond expeditiously to any evidence of the contamination of that supply (including
notifying the public of such an event).
All response actions must be initiated by immediately ceasing injection, taking all steps
reasonably necessary to identify and characterize any release, notifying the UIC Program
Director within twenty-four (24) hours, and implementing the approved Emergency and
Remedial Response Plan [40 CFR 146.94(b)].
4. Identify the personnel and equipment needed to implement the response actions. These
personnel may include first responders (e.g., fire departments or haz-mat units), GS project
facility staff, or environmental contractors. EPA recommends that the plan be as specific as
possible (e.g., by providing the names and titles of people who will respond) to avoid
confusion in an emergency situation. Where facility staff are identified as responding
personnel, the plan might describe their relevant training and exercises (e.g., emergency
drills) and verify that qualified staff are always onsite during operations. For example, the
plan may describe which staff receive training, the training materials used, and what actions
staff will be able to perform after receiving this training. EPA also recommends that the plan
identify where the necessary equipment will be procured.
Because response personnel may change from time to time, EPA encourages owners or
operators to ensure that this list is reviewed and updated periodically. While such personnel
changes would not necessarily warrant an amendment to the Emergency and Remedial
Response Plan, the owner or operator may consider including a schedule for verifying and
updating the list (i.e., every few months) in the plan.
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EPA recommends that the Emergency and Remedial Response Plan also include the following
information:
Facility emergency 24-hour contacts, including phone/pager numbers and e-mail
addresses;
A list of people to notify in case of an adverse event (e.g., local water systems, carbon
dioxide generators and pipeline operators, nearby land owners, the permitting authority,
other states or countries in the AoR, or Regional Response Teams);
The location of the well, such as the specific town or county (this often drives who are
first responders, applicable local ordinances, etc.);
A map of the area, including the location of the well and nearby population centers or
sensitive environments. This map may be an adaptation of or enhancement to the map of
the AoR required at 40 CFR 146.82(a)(2);
Schematics and diagrams of the facility and well, including the location of monitoring
equipment and emergency shutoffs; and
A communications plan and emergency notification procedures that describe
potential audiences (e.g., the public, community leaders), communication methods (e.g.,
newspapers or public service announcements), and messages.
The details of an Emergency and Remedial Response Plan may be influenced by a variety of
site-specific factors. EPA recommends that the following be considered in planning for
emergency and remedial response:
The size of the site and the AoR, including the volume of carbon dioxide injected and
proposed operating conditions and properties of the carbon dioxide. For larger AoRs,
more resources and infrastructure are potentially impacted;
The number of wells in the AoR and their age (for converted wells), which may affect
the likelihood of a well failure or fluid movement;
The composition of the carbon dioxide and subsurface geochemistry and
mineralogy, which would impact the potential for contamination of ground water or
private and public water supplies;
Proximity and depth to potentially affected USDWs or other drinking water sources
and public water supplies;
Resources located in the AoR, e.g., the presence of communities and sensitive
populations, drinking water systems, residences, land uses, population centers, or
buildings;
Whether the project will operate under an injection depth waiver. See the Class VI
Rule and the Draft UIC Program Class VIInjection Depth Waivers Guidance for more
information about Class VI injection wells operating under approved waivers; and
Procedures for immediate well shut-down and creating alternate options for the carbon
dioxide stream.
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6.2 UIC Program Director's Evaluation of the Emergency and Remedial Response Plan
The UIC Program Director will evaluate the owner's or operator's proposed Emergency and
Remedial Response Plan, along with the geologic and proposed operating data submitted with
the Class VI permit application in determining whether to approve the plan. Therefore, the owner
or operator must demonstrate in the proposed Emergency and Remedial Response Plan, to the
satisfaction of the UIC Program Director, that any needed response will be adequate for
mitigating any adverse events that may arise during injection and through the PISC period.
The UIC Program Director should evaluate the proposed Emergency and Remedial Response
Plan to verify that it meets the requirements of 40 CFR 146.94(a) and that the plan accounts for
all site-specific conditions. For example:
Are all potentially affected activities within the AoR, including the presence of population
centers and all land uses, addressed in the plan?
Is special consideration given to events with the highest potential of occurring or to events
that may have the highest impacts?
Are all reasonably anticipated potential adverse events at the facility addressed in the plan
and are appropriate procedures, equipment, and trained personnel identified?
Are the planned response activities appropriate to the risk scenarios identified and their
potential impacts on resources or infrastructure?
Does the plan include proper procedures, including ties to the Testing and Monitoring Plan,
for quickly detecting and responding to situations that may endanger USDWs?
The submittal, evaluation, and approval of the Emergency and Remedial Response Plan are
meant to be part of an iterative process. This may involve multiple rounds of drafts until all of
the required information is submitted in an appropriate format and level of detail. If the UIC
Program Director has reason to believe (e.g., based on site-specific conditions) that additional
data are needed to sufficiently address risk at the site, it is within his/her authority to request that
additional information be provided. The approved Emergency and Remedial Response Plan is
enforceable, whether or not it is a condition of the permit, because the plan itself and the UIC
Program Director's approval are required by the Class VI Rule [40 CFR 146.93(a)].
Interaction and conversation between the owner or operator and the UIC Program Director are
encouraged. Such discussions prior to developing and submitting the plan can increase the
chance that the proposed plan will be approved and avoid the need to revise the plan.
Appendix F of this guidance document presents a checklist of questions and considerations that
UIC Program Directors may use when evaluating the proposed Emergency and Remedial
Response Plan and other GS project plans. See the Draft UIC Program Class VIImplementation
Manual for additional information on the UIC Program Director's evaluation of the Emergency
and Remedial Response Plan.
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6.3 Amending the Emergency and Remedial Response Plan
The Class VI Rule requires that the Emergency and Remedial Response Plan be reviewed and, if
necessary, amended following each reevaluation of the AoR [40 CFR 146.94(d)]. The purpose of
this review is to ensure that management of the project and all of the project plans are based on
the most up-to-date information available to allow a prompt response to potential USDW
endangerment. This review of the Emergency and Remedial Response Plan follows the required
AoR reevaluation, which must occur at least once every five (5) years (see the Draft UIC
Program Class VI Well AoR Evaluation and Corrective Action Guidance for additional
information on performing AoR reevaluations). The amended Emergency and Remedial
Response Plan (or a demonstration that no amendment is needed) is due no later than one (1)
year after the reevaluation [40 CFR 146.94(d)(l)].
EPA recommends that reviews of the Emergency and Remedial Response Plan continue through
the post-injection phase. As the owner or operator submits monitoring data collected during
PISC (See Section 5.1.4 of this guidance document), they are encouraged to discuss the results
with the UIC Program Director to identify whether any amendments to the Emergency and
Remedial Response Plan are needed.
EPA recommends that owners or operators use the results of the AoR reevaluation, along with
the monitoring (e.g., carbon dioxide plume and pressure front tracking and ground water
monitoring) and operational data (e.g., injection rates and volumes) collected since the last AoR
reevaluation, to assess the need for amending the Emergency and Remedial Response Plan. The
owner or operator is also encouraged to review the plan if there are significant changes to GS
facility operations, such as the addition of an injection well or if any adverse events occurred that
required the implementation of the Emergency and Remedial Response Plan.
The owner or operator and the UIC Program Director are encouraged to coordinate and discuss
the most recent AoR evaluation, along with monitoring and operational data, and other
information about the Class VI injection well during this review. This dialogue is an important
part of the process to ensure that the GS project is (and continues to be) managed appropriately
to protect USDWs, and that compliance with the Class VI operating permit is achieved. These
discussions can also help the owner or operator understand the UIC Program Director's
expectations, including whether an amended plan is needed so that the UIC Program Director
receives all the required information up front in order to facilitate the review process.
The Sections below describe a recommended process by which the owner or operator may
review and amend the Emergency and Remedial Response Plan.
Step 1: Review the results of the AoR reevaluation or relevant monitoring and operational
data. The purpose of this review is to identify whether an amendment to the Emergency and
Remedial Response Plan is needed. Topics to be considered in the review include:
If the most recent AoR reevaluation required a revision to the AoR computational model or
any changes to the prediction of plume and pressure front movement;
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Whether any of the considered emergency scenarios are more likely to occur than originally
considered (e.g., if ground water chemistry is changing);
Whether MIT results indicate increased concerns for well failures;
If recent (or planned) land use changes brought new resources or infrastructure near or into
the AoR; or
If there has been a need to implement emergency procedures at the site, lessons learned
might be incorporated into an amended Emergency and Remedial Response Plan.
Step 2: Discuss the results with the VIC Program Director. The owner or operator and the UIC
Program Director are encouraged to discuss whether an amendment to the Emergency and
Remedial Response Plan is needed. If the AoR reevaluation and monitoring/operating data were
to show that the plume is moving as predicted, an amendment may not be needed. The final
decision regarding the need for an amended plan will be made by the UIC Program Director.
If a review of the AoR reevaluation or other project data indicate that an amendment to the
Emergency and Remedial Response Plan is necessary, then EPA recommends that work on
revising the plan begin so that the one (1) year deadline for amending this plan (along with any
necessary amendments to other related project plans) can be met. In lieu of a conversation with
the UIC Program Director, the owner or operator might use the site-specific monitoring and
operational data to prepare and present a recommendation for action on an amended Emergency
and Remedial Response Plan. If, based on a review of all available data and information, no
amendment is needed, the existing approved Emergency and Remedial Response Plan remains in
force.
Step 3: Amend the Emergency and Remedial Response Plan if needed. EPA recommends that
the amended Emergency and Remedial Response Plan include the same categories of
information that were in the original plan developed before injection commenced (see Section
6.1 of this guidance document). EPA recommends that the amended plan include the following
information (as warranted):
The addition of newly identified resources or infrastructure that should be addressed in the
Plan, e.g., additions to the facility, new construction within the AoR, or newly identified
resources based on changes to the modeled AoR;
Updates to the list of responding personnel or their training;
Modifications to communications and notification procedures to address population or land
use changes;
Any newly developed procedure that was not in the approved Emergency and Remedial
Response Plan; and
Lessons learned, if any events necessitated the prior implementation of the Emergency and
Remedial Response Plan.
Step 4: Submit the amended plan. The Class VI Rule requires that the owner or operator submit
the amended Emergency and Remedial Response Plan to the UIC Program Director for approval
within one (1) year of the AoR reevaluation or within one (1) year of other event that triggers an
Emergency and Remedial Response Plan review [40 CFR 146.94(d)(l) and 146.94(d)(2)]. The
owner or operator and UIC Program Director are encouraged to establish a schedule for
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submitting amendments to the Emergency and Remedial Response Plan during the post-injection
monitoring phase.
The amended plan must be approved by the UIC Program Director and would then be
incorporated into the Class VI permit. If significant changes to the plan are needed, the UIC
Program Director may need to modify the permit. A permit modification under 40 CFR 144.39
(e.g., to incorporate a plan that involves additional resources or infrastructure) would require
notification to the public and an opportunity for comment. See 40 CFR for more details on the
process. Minor changes to the plan, as defined under 40 CFR 144.41 (e.g., to provide
clarification, change contact information, or correct typographical errors), do not require a permit
modification or a public process under 40 CFR Part 124. See the Draft UIC Program Class VI
Implementation Manual for additional information about the procedures for modification of
Class VI permits and the related plan amendments.
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Appendix A
Sample Template of an Area of
Review and Corrective Action
Plan
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Appendix A: Sample Template of an Area of Review and Corrective Action Plan
Facility Information
Facility name:
Facility contacts (names, titles, phone numbers, email addresses):
Location (town/county/etc.):
Computational Modeling
Model Name:
Model Authors/Institution:
Description of model:
Model Inputs and Assumptions:
EPA recommends that this section describe how each of the following types of
information will be used to inform the computational modeling. EPA recommends that
owners or operators reference geologic reports and data submitted with the Class VI
permit application as appropriate. The owner or operator should also provide the values
of all model parameters, any constitutive relationships, proposed modeling timeframe,
and proposed initial and boundary conditions.
Subsurface formations (including the type and number of formations between the
uppermost USDWand the injection zone, heterogeneity of the geologic
stratigraphy, and permeability);
Geologic structure (including faults or fractures);
Hydrogeologic information (including initial fluid pressures, horizontal and
vertical gradients, ground water flow direction and velocity);
Geochemistry and compatibility of injectate fluids (including soil and rock
chemistry or potential mineralization reactions);
Proposed operating data (e.g., injection rates and pressures and injection
depths);
Other injection operations, mines or other subsurface activities, and abandoned
wells (including the number, depth, and description of injection points in each
geologic formation); and
If an injection depth waiver is being requested, explain here how the model
accounts for all USDWs that can be affected.
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Corrective Action Plan and Schedule
Pre-Injection Corrective Action Schedule
Well Name/
Location
Include each
deficient well in
theAoR.
References to
map(s) may be
appropriate.
Planned Date of
Corrective
Action
The dates should
be consistent with
AoR model
results.
Planned Corrective
Action Method
Including the type, volume,
and depth of plugs to be
used or other risk
management strategies.
Reference well schematics
as appropriate.
Notes
Considerations that drive the
corrective action plans, e.g., age
and maintenance of the well;
cement condition; well
depth/subsurface formations
penetrated; or formation
fluid/carbon dioxide stream
geochemistry. Confirmation of
site access.
Plan for Site Access
Describe here how access to all wells needing corrective action will be guaranteed.
Phased Corrective Action Schedule
Well Name/
Location
Planned Date of
Corrective Action
Planned Corrective
Action Method
Notes
Justification of Phased Corrective Action
Describe why corrective action on certain wells can be deferred based on preliminary
information about the AoR.
Attachments
Preliminary maps of the AoR with deficient wells identified
Plugging schematics
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Area of Review Reevaluation Plan and Schedule
Reevaluation Strategy
Describe what will be involved in an AoR reevaluation, including the types and amount
of input data that will be used to update the model, e.g., operating data, carbon dioxide
plume and pressure front tracking results, geochemical monitoring data, or information
on other operators (i.e., of injection or production wells) in the AoR.
Proposed Reevaluation Cycle
Identify the frequency at which reevaluations are planned (in no case can this be less
often than every five [5] years). Present a justification, based on:
Anticipated plume movement relative to land uses or other features that may
be potentially affected or intersected.
Neighboring projects expected to come online or that will also be injecting
carbon dioxide.
Development, land use changes, and population growth.
Phased corrective action, if planned.
Modeling issues, i.e., whether any uncertainty in the model or assumptions
may warrant frequent reevaluations.
Planned injection volumes and rates.
Public opinion or concerns.
Triggers for AoR Reevaluations Prior to the Next Scheduled Reevaluation
Trigger
Change in rate, direction, or extent of carbon dioxide plume
movement
Operating changes, e.g., carbon dioxide injection rates/volumes
New owners or operators in AoR/ new injection well(s) online
New site characterization data
Seismic Event or Other Emergency
Violation of Permit Conditions
Other...
Time Frame for Reevaluation
e.g., within one (1) month of
detection
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Appendix B
Sample Template of a Testing
and Monitoring Plan
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Appendix B: Sample Template of a Testing and Monitoring Plan
Facility Information
Facility name:
Facility contacts (names, titles, phone numbers, email addresses):
Location (town/county/etc.):
Carbon Dioxide Stream Analysis
Parameter/Analyte
pH
Temperature
Etc...
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/chain of custody procedures:
Quality assurance and surveillance measures:
Continuous Recording of Injection Pressure, Rate, and Volume; Annulus Pressure
Describe the recording devices to be used, quality assurance and surveillance measures,
the frequency at which the information will be recorded, and how the data will be
recorded and reported.
Corrosion Monitoring
Describe the corrosion monitoring method to be used and associated quality assurance
and surveillance measures, and a schedule for performing the quarterly tests (e.g.,
anticipated testing dates) and how the data will be reported.
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Ground Water Quality Monitoring
Monitoring well name/location/map reference:
Well depth/formation(s) sampled:
Parameter/Analyte
Aqueous and pure phase carbon dioxide
Total dissolved solids
pH
Specific conductivity (SC)
Temperature
Other parameters (e.g., major anions and cations; trace metals;
tracers; hydrocarbons; and volatile organic compounds)
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/ chain of custody procedures:
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
External Mechanical Integrity Testing
Describe specific MIT(s) to be employed, associated quality assurance and surveillance
measures, anticipated testing dates, and plans to record and report the results.
Pressure Fall-Off Testing
Describe the pressure fall-off tests to be employed, associated quality assurance and
surveillance measures, anticipated testing dates, and plans to record and report the test
results.
Carbon Dioxide Plume and Pressure Front Tracking
Direct Pressure Monitoring
Well Location/Map Reference
Depth(s)/Formation(s)
Frequency
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
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Indirect Carbon Dioxide Plume and Pressure Front Tracking
Describe indirect methods to be used (e.g., types of indirect surveys to be performed, the
planned areal extent/resolution of geophysical surveys, and planned frequency/schedule)
and their associated quality assurance and surveillance measures, and plans to record
and report the results.
If indirect methods cannot be used, describe why.
Direct Geochemical Plume Monitoring
If it is determined that direct geochemical monitoring of the plume is necessary, describe
the locations where samples will be taken and parameters to be monitored.
Monitoring Location/Map Reference
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/ chain of custody procedures:
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
Surface Air and/or Soil Gas Monitoring (if required by the VIC Program Director)
Monitoring Location/Map Reference
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/ chain of custody procedures:
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
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Additional Monitoring (if required by the VIC Program Director)
Describe testing techniques and methods and their associated quality assurance and
surveillance measures, testing frequency (e.g., anticipated test dates), and plans to record
and report the results.
Attachments
Map showing monitoring well locations; boundary of geophysical survey areas
Monitoring well schematics
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Appendix C
Sample Template of an
Injection Well Plugging Plan
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Appendix C: Sample Template of an Injection Well Plugging Plan
Facility Information
Facility name:
Facility contacts (names, titles, phone numbers, email addresses):
Locati on (town/county/etc.):
Planned tests or measures to determine bottom-hole reservoir pressure:
Planned external mechanical integrity test(s):
Information on Plugs:
Diameter of Boring in
Which Plug Will be Placed
Depth to Bottom of Tubing
or Drill Pipe
Sacks of Cement to be
Used (each plug)
Slurry Volume to be
Pumped
Slurry Weight
Top of Plug
Bottom of Plug
Type of Cement or Other
Material
Method of Emplacement
(e.g., balance method,
retainer method, or two-
plug method)
Plug#l
Plug #2
Plug #3
Plug #4
Plug #5
Plug #6
Plug #7
Attachments:
Injection well construction plan/schematics showing depth to tubing stub, exposed formation
intervals, casing diameters, depths, etc.
Information on formations, depths to USDWs, etc.
Schematic/drawings of the placement of all plugs.
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Appendix D
Sample Template of a PISC and
Site Closure Plan
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Appendix D: Sample Template of a PISC and Site Closure Plan
Facility Information
Facility name:
Facility contacts (names, titles, phone numbers, email addresses):
Location (town/county/etc.):
Pre- and Post-Injection Pressure Differential
Figure: Predicted pressure changes (pre-injection to the cessation of injection).
Source: AoR delineation modeling.
Predicted Position of the Carbon Dioxide Plume and Associated Pressure Front at Site
Closure
Figure: Map showing the extent of the carbon dioxide plume and pressure front at site closure.
Source: AoR delineation modeling.
Post-Injection Monitoring Plan
Ground Water Quality Monitoring
Monitoring well name/location/map reference:
Well depth/formation(s) sampled:
Parameter/Analyte
Aqueous and pure phase carbon dioxide
Total dissolved solids
pH
Specific conductivity (SC)
Temperature
Other parameters (e.g., major unions and cations; trace metals;
tracers; hydrocarbons; and volatile organic compounds)
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/ chain of custody procedures:
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
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Carbon Dioxide Plume and Pressure Front Tracking
Direct Pressure Monitoring
Well Location/Map Reference
Depth(s)/Formation(s)
Frequency
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
Indirect Carbon Dioxide Plume and Pressure Front Tracking
Describe indirect methods to be used (e.g., types of indirect surveys to be performed, the
planned areal extent/resolution of geophysical surveys, and planned frequency/schedule)
and their associated quality assurance and surveillance measures, and plans to record
and report the results.
Direct Geochemical Plume Monitoring
If it is determined that direct geochemical monitoring of the plume is necessary, describe
the locations where samples will be taken and parameters to be monitored.
Monitoring Location/Map Reference
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/ chain of custody procedures:
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
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Surface Air and/or Soil Gas Monitoring (if required by the VIC Program Director)
Monitoring Location/Map Reference
Frequency
Sampling methods:
Analytical techniques:
Laboratory to be used/ chain of custody procedures:
Quality assurance and surveillance measures:
Plan for guaranteeing access to all monitoring locations:
Additional Monitoring (if required by the VIC Program Director)
Describe testing techniques and equipment and their associated quality assurance and
surveillance measures, testing frequency (e.g., anticipated test dates), and plans to record
and report the results.
Proposed Schedule for Submitting Post-Injection Monitoring Results
Planned Testing/Monitoring
Ground Water Quality Monitoring Data
Carbon Dioxide Plume and Pressure Front
Tracking Data
Direct Pressure Monitoring Data
Indirect Carbon Dioxide Plume and Pressure
Front Tracking Data
Surface Air and/or Soil Gas Monitoring Data
(if required by the UIC Program Director)
Additional Monitoring Data (if required by
the UIC Program Director)
Reporting Schedule
e.g., quarterly
Alternative Post-Injection Site Care Timeframe
Describe the alternative post-injection site care timeframe and the demonstration made
under 40 CFR 146.82(a)(18) if approved by the UIC Program Director. The
demonstration of an alternative post-injection site care timeframe must meet the criteria
under 40 CFR 146.93(c)(l).
This description should also include the expected timing that the non-endangerment
demonstration may be made and advanced schedules for PISC and site closure.
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Non-endangerment Demonstration Criteria
Describe the criteria and conditions that will be used to demonstrate non-endangerment
at the site. This may include the predicted AoR extent, injection formation pressures,
information on USDWs within the AoR, and relevant monitoring results.
Site Closure Plan
Planned Remedial/Site Restoration Activities:
Describe plans for removing all surface equipment and restoring vegetation.
Information on Plugs for Monitoring Well #1:
Diameter of Boring in
Which Plug Will be Placed
Depth to Bottom of Tubing
or Drill Pipe
Sacks of Cement to be
Used (each plug)
Slurry Volume to be
Pumped
Slurry Weight
Top of Plug
Bottom of Plug
Type of Cement or Other
Material
Method of Emplacement
(e.g., balance method,
retainer method, or two-
plug method)
Plug#l
Plug #2
Plug #3
Plug #4
Plug #5
Plug #6
Plug #7
Include additional tables for other monitoring wells.
UIC Program Class VI Well Project Plan
Development Guidance
D-6
August 2011
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Appendix E
Sample Template of an
Emergency and Remedial
Response Plan
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UIC Program Class VI Well Project Plan E-2 August 2012
Development Guidance
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Appendix E: Sample Template of an Emergency and Remedial Response Plan
Facility Information
Facility name:
Facility contacts (names, titles, phone numbers, email addresses):
Location (town/county/etc.):
List of Resources/Infrastructure
List/describe the resources and infrastructure that may be impacted by an adverse event
(e.g., wells, USDWs, surface water bodies, sensitive nearby environments, structures).
Indicate the potential for any scenarios to be of high impact, e.g., if all people in the area
are served by a single drinking water source.
Infrastructure/Resource-Specific Events and Response Plan
Describe the type(s) of adverse event(s) that may occur at each resource/infrastructure; whether
the risk is considered to be high, medium, or low; and planned response actions, response staff,
and equipment. Exhibit E-l at the end of this appendix provides examples of potential adverse
events and corresponding response actions at Class VI well sites.
Infrastructure: Injection well (map reference)
Potential adverse event #1: e.g., a well blowout
Risk level:
Potential response action(s):
Response personnel:
Equipment:
Potential adverse event #2:
Risk level:
Available response action(s):
Response personnel:
Equipment:
Etc...
Resource: USDW
Potential adverse event #1:
Risk level:
Available response action(s):
Response personnel:
Equipment:
UIC Program Class VI Well Project Plan E-3 August 2012
Development Guidance
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Resource: [Name of municipality] water supply (map reference)
Potential adverse event #1:
Risk level:
Available response action(s):
Response personnel:
Equipment:
Resource: [Name of surface water body] (map reference)
Potential adverse event #1:
Risk level:
Available response action(s):
Response personnel:
Equipment:
List other applicable resources/infrastructure.
Staff Training and Exercise Procedures:
Describe any such procedures. The description may include:
- Which staff are priority to receive the relevant training;
- What training materials or potential source of materials may be used; and
- What actions staff will be able to perform after receiving training.
Communications Plan and Emergency Notification Procedures:
Emergency response contact(s) and role(s):
Communication methods (e.g., Internet, newspapers, public service announcements):
Audience:
Other contacts: e.g., local water systems, carbon dioxide source(s) and pipeline operators,
land owners, other states or countries in the AoR, Regional Response Teams (Regional
Response Teams represent geographic regions of the U.S. and are made up of
representatives from federal agencies as part of the National Response Team).
Attachments:
Safety and Health Plan
Map of the AoR showing resources and infrastructure
UIC Program Class VI Well Project Plan E-4 August 2012
Development Guidance
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Exhibit E-l
Examples of Potential Adverse Class VI Events and Emergency Response Options
Adverse Event
Leaking well/Loss of
mechanical integrity
Well blowout
Ground water
contamination
Surface water
contamination
Leakage through faults
and fractures
Accumulation of carbon
dioxide in indoor air
Potential Response Actions
o Stop injection and notify the UIC Program Director within 24 hours.
o Repair the well by plugging it with cement.
o Pull and replace the tubing or the packer.
o Create a hydraulic barrier by increasing reservoir pressure up-gradient of
the leak.
o Install chemical sealant barrier to block leaks.
o Stop injection and notify the UIC Program Director within 24 hours.
o Close the blowout preventer; insert rams into the well.
o Kill the well by pumping a fluid down the well bore that is heavier than
the blowout fluid until the well stops flowing.
o Drill another hole to intersect the well and pump fluid down.
o Stop injection and notify the UIC Program Director within 24 hours.
o Pump carbon dioxide-contaminated groundwater to the surface and aerate
it to remove carbon dioxide.
o Apply "pump and treat" methods to remove trace elements.
o Drill wells that intersect the accumulations in groundwater and extract
carbon dioxide.
o Provide an alternative water supply if ground water-based public water
supplies are contaminated.
o Stop injection and notify the UIC Program Director within 24 hours.
o Shallow surface water bodies that have significant turnover (e.g., shallow
lakes) or turbulence (e.g., streams) will quickly release dissolved carbon
dioxide back into the atmosphere.
o Create a hydraulic barrier by increasing reservoir pressure upstream of
the leak.
o Stop injection and notify the UIC Program Director within 24 hours.
o Lower injection rates/pressures.
o Install chemical sealant barriers to block leaks.
o Stop injection and notify the UIC Program Director within 24 hours.
o Manage potential slow indoor releases with basement/substructure
venting or pressurization.
o Use fans to disperse carbon dioxide similar to radon fans.
Adapted from: World Resources Institute. CCS Guidelines: Guidelines for Carbon Dioxide Capture,
Transport, and Storage. Washington DC. 2008. Table 8, p. 77.
UIC Program Class VI Well Project Plan
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E-5
August 2012
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UIC Program Class VI Well Project Plan E-6 August 2012
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Appendix F
Checklist of Recommended
Considerations for Evaluating
Plans and Amendments
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UIC Program Class VI Well Project Plan F-2 August 2012
Development Guidance
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Appendix F: Checklist of Recommended Considerations for Evaluating Plans and
Amendments
Below is a checklist of questions and considerations that UIC Program Directors may use when
evaluating the proposed project-specific plans and/or amendments.
Geology and Hydrogeology
Geologic conditions, including structures and the type and number of subsurface
formations:
o The presence of faults and fractures, which may affect plume movement and
containment.
o The presence of oil/gas/water, which may impact the feasibility of geophysical
tests or necessitate monitoring for released hydrocarbons.
o The type, number, and thickness of subsurface formations between the lowermost
USDW and the injection zone, which impact AoR model selection and
assumptions and the amount of monitoring needed.
o Heterogeneity of the geologic stratigraphy, permeability, or other parameters,
which impact AoR model selection and assumptions.
Baseline geochemical and mineralogical data:
o The geochemistry of formations that are penetrated by the well, which may affect
compatibility with the injectate, ground water monitoring needs and the
parameters to be analyzed, and corrective action and injection well plugging
methods and the types of cement.
o Composition and mineralogy of the subsurface soil/rock matrix and the potential
for mineralization reactions and porosity changes, which may impact ground
water analysis.
o Fluid pressures, horizontal and vertical gradients, and groundwater flow direction
and velocity of subsurface formations, which impact AoR model selection and
assumptions.
o Multiphase flow parameters, and assumed relative permeability-saturation
relationships and equations of state, which impact AoR model selection and
assumptions.
Hydrogeological data and USDWs:
o Proximity and depth to USDWs or other drinking water sources, which may
necessitate additional monitoring.
o The presence of multiple subsurface layers with USDWs and the types of
subsurface formations penetrated by the well, which may affect the placement of
monitoring wells and injection well plugging and cement.
o If an injection depth waiver is sought, all USDWs above and below the injection
zone must be addressed.
UIC Program Class VI Well Project Plan F-3 August 2012
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Land Uses and Activities in the AoR
Land uses include population, sociological, and demographic considerations:
o Activities in the AoR, e.g., the presence of communities, residences, population
centers, or buildings, which may drive monitoring needs.
o The pace of development or land use changes in the region, which may impact
monitoring needs or AoR reevaluation schedules (e.g., if additional wells may be
drilled, or abandoned, between AoR evaluations).
o Past and planned land use changes, which may affect the owner's or operator's
ability to access monitoring sites or wells for corrective action.
o Proximity and depth to public water supplies or private wells, which may
necessitate targeted monitoring and considerations for emergency and remedial
response planning.
o Environmental justice concerns and potentially disproportionate impacts on health
to a particular subpopulation (low income or minority) or children's health.
o Public input and concerns.
Physical properties of the land due to human impacts:
o The presence of active and abandoned wells, which must be accounted for in AoR
modeling, addressed in corrective action, and may impact monitoring locations.
o The presence (or planned presence) of other operators. Where multiple operators
are involved, AoR models should account for pressure changes that may result
from all injection operations in a formation or a series of hydraulically connected
formations.
o The presence (or planned presence) of mineral exploration, drilling, or abandoned
wells, which can affect containment.
Injection Well/Operations
UIC Program Directors might consider several factors related to planned injection well
operations:
Carbon dioxide stream geochemistry:
o The potential for impurities in the carbon dioxide stream, e.g., based on the
process generating the carbon dioxide and capture technologies. This can impact
the potential degradation of well materials (and therefore corrective action
methods and methods to plug the injection well) and carbon dioxide analysis
needs.
o Whether the source of the carbon dioxide will vary over the life of the well.
Frequent changes in the carbon dioxide source or multiple sources may
necessitate more frequent carbon dioxide stream analysis.
o If the carbon dioxide will be injected on site or be piped/transported somewhere
else for injection, which may result in contamination or mixing with water.
UIC Program Class VI Well Project Plan F-4 August 2012
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Operational data (e.g., injection rates and volumes) collected. This will affect the size of
the AoR, and therefore, required corrective action, monitoring sites, and the resources/
infrastructure to address in the Emergency and Remedial Response Plan.
The AoR model/predicted size and extent of the carbon dioxide plume:
o The anticipated size and shape of the AoR, which would affect monitoring
locations and the areal extent of geophysical surveys, and the resources/
infrastructure to address in the Emergency and Remedial Response Plan.
o The anticipated rate of plume movement and which wells will be intersected by
the carbon dioxide plume and pressure front, which will affect AoR reevaluation
and corrective action schedules.
o Confidence in the assumptions that will be used for AoR delineation or the
general modeling approach. Significant uncertainties in AoR delineation
modeling may be addressed by more frequent reevaluation and comparison to
monitoring data, particularly early in the project.
Additional Considerations for AoR Reevaluations and Plan Amendments
Evidence of leaching/mobilization of metals, organics, etc., which may indicate a need to
change ground water monitoring parameters.
Indications that the carbon dioxide plume is moving faster than predicted or in a different
direction, which may warrant more pressure monitoring (i.e., in more locations) or more
frequent geophysical surveys and AoR reevaluation.
Comparison of model results and monitoring data. If the original model (or the previous
AoR model) does not closely match monitoring results, or if there was a significant
change in results from the last modeling run, the modeling assumptions may need to be
revised or additional inputs may be needed.
MIT results that may indicate concerns about the well.
Any significant changes to the facility, e.g., to injection volumes or the number of wells.
If there are new owners or operators in the AoR or new mines or other subsurface land
uses.
If recent (or planned) land use changes brought new receptors or infrastructure near/into
the AoR.
If there has been a need to implement emergency procedures or any of the considered
emergency scenarios are more likely to occur than originally considered.
UIC Program Class VI Well Project Plan F-5 August 2012
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Sources of Additional Information
Final Class VI Rule and Preamble. Available on the Internet at:
http://water.epa.gov/type/groundwater/uic/wells sequestration.cfm).
Environmental Protection Agency (EPA) Class VI Rule Guidance documents. Available on the
Internet at: http://owpubauthor.epa.gov/type/groundwater/uic/class6/gsguidedoc.cfm.
Emergency Planning and Community Right-to-Know Act (EPCRA) Local Emergency Planning
Requirements. Available on the Internet at:
http://www.epa.gov/emergencies/content/epcra/epcra_plan.htm.
EPA Office of Emergency Management. Available on the Internet at:
http://www.epa.gov/emergencies.
EPA. 2008. Vulnerability Evaluation Framework for Geologic Sequestration of Carbon Dioxide.
EPA430-R-08-009. July 10.
EPA. 2010. Technologies Available to Address Induced Faults and Fractures: Considerations for
GS Sites. 816-R10-0018.
EPCRA Emergency Release Notification Requirements. Available on the Internet at:
http://www.epa.gov/OEM/content/epcra/epcra_report.htm.
Homeport: U.S. Department of Homeland Security, U.S. Coast Guard. Available on the Internet
at: http://homeport.uscg.mil/mycg/portal/ep/home.do.
National Oil and Hazardous Substances Pollution Contingency Plan Overview. Available on the
Internet at: http://www.epa.gov/OEM/content/lawsregs/ncpover.htm.
National Response Team. Available on the Internet at:
http ://www. epa. gov/OEM/content/partners/nrsrrt. htm.
Regional Response Teams. Available on the Internet at:
http://www.epa.gov/OEM/content/partners/nrsrrt.htm;
http://www.epa.gov/OEM/content/nrs/nrsworks.htm.
Requirements for Oil Facility Response Plans. 33 CFR Part 154 subpart F.
World Resources Institute. CCS Guidelines: Guidelines for Carbon Dioxide Capture, Transport,
and Storage. Washington DC. 2008.
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