### EPA’s Responses to Public Comments on the Proposed Geologic Sequestration Rule On July 25, 2008, EPA published the proposed “ Federal Requirements Under the Underground Injection Control (UIC) Program for Carbon Dioxide (CO 2 

### ) Geologic Sequestration (GS) We lls ” (73 FR 43492). Following publication of the proposed rule, the Agency invited the public to comment over a 150 - day comment period (including a 30 - day extension) , which ended on December 24, 200 8. EPA received submittals from 190 commenters (this num ber includes a few comment letter s received after the close of the public comment period ). EPA held two public hearing s on the proposed rule on September 30, 2008 , in Chicago, Illinois , and October 2, 2008 , in Denver, Colorado . Eleven people commented at the Chicago hearing , and 19 people provided comments at the Denver hearing (some stakeholders commented at both). A ttendee s' comments were transcribed and responded to in the same way that the Agency addressed written comments (i.e., those submitted to th e EPA docket ). EPA reviewed, evaluated, and responded to all comments submitted. EPA prepared line - by - line responses to each commenter’s submittal. The rulemaking docket contains responses to each comment letter ( i. e., from individual commenters or organi zations ) . These responses are also compiled and presented according to topic area (e.g., on testing and monitoring requirements for Class VI wells) . Note: responses to comments on EPA’s Notice of Data Availability and Request for Comment (74 FR 44802) are available elsewhere in the rulemaking docket. To view EPA's responses to a particular comment letter : For each comment letter, EPA created a corresponding commenter - specific response document. See Attachment 1 for a list of all commenters , the associat ed docket number of the original comment (from www. regulations.gov) , and the docket number of EPA’s response. The table in A ttachment 1 is presented in alphabetical order by the organization of the commenter (or the commenter’s name, where no organization was provided). Please note the correct docket number for organizations that submitted multiple comments; higher docket numbers correspond to later submittals. To view EPA's responses to all comments on a specific topic : The final rulemaking docket al so contains a compilation of all comments on a given topic ( e.g., on testing and monitoring requirements for Class VI wells) , and EPA's responses to each individual comment. Note that, due to the nature of the comments and “common themes” in the submitted comments, there is a great deal of repetition in these sections . Conversely, some topics may not have any comments associated with them. The table below presents : (1) the major topic areas into which EPA organized individual comments ; (2) the associated EPA - assigned comment codes, and , (3) the docket ID where the topic - specific compiled summary may be found. For a detailed list of all comment codes, see Attachment 2.Summary of Comment Code Topics on the Proposed GS Rule Topic Comment Codes Docket ID 1.1 General comments (e.g., comments about the proposed rule, including terminology, definitions, and the regulatory text; the need for more flexibility or stringency; comments on other rules/issues; and general comments about GS) 1000 to 1390 EPA - HQ - OW -2008-0390- 0578 1.2 EPA's Authority (includes comments supporting/opposing the rulemaking or EPA's authority to regulate CO 2 injection, other related authorities, and State regulatory efforts on GS) 1400 to 1540 EPA - HQ - OW -2008-0390- 0579 1.3 Risk Associated with GS (e.g., risks to USDWs; i nduced seismicity; RCRA/CERCLA issues; and human health and ecosystem impacts) 1600 to 1680 EPA - HQ - OW -2008-0390- 0580 1.4 Scientific Background (e.g., research on identifying risks to USDWs, field research on GS, technical workshops and stakeholder outreach on the rule, and EPA's Technical Guidance for Pilot GS Projects) 1800 to 1980 EPA - HQ - OW -2008-0390- 0581 1.5 Need for a New Class of Well (comments related to the appropriateness of Class I, Class II, or Class V requirements to GS and grandfathering existing wells) 2000 to 2066 1.6 Target Geologic Formations (includes comments on GS in deep saline formations, depleted oil and gas reservoirs, unmineable coal seams, basalts, etc.) 2100 to 2200 EPA - HQ - OW -2008-0390- 0582 1.7 Regulatory Alternatives Considered 2300 to 2340 1.8 Adaptive Rulemaking Approach 2400 2.1 Geologic Siting ( comments on the need for injection/confining zones and required permit information) 3100 to 3150 EPA - HQ - OW -2008-0390- 0584 2.2 AoR and Corrective Action (e.g., delineating the AoR using computational models, identifying and addressing wells that need corrective action, AoR r eevaluations, phased corrective action, and AoR and corrective action plans) 3200 to 3700 EPA - HQ - OW -2008-0390- 0585 2.3 Inject ion Well Construction (including well construction procedures, e.g., for surface casing, long - string casing, tubing and packer; horizontal well drilling techniques; use of corrosion - resistant materials and cements; and pre - injection logging and testing) 38 00 to 3866 EPA - HQ - OW -2008-0390- 0586 2.4 Operating Requirements (e.g., injection pressure limitations, use of hydraulic fracturing for GS, down - hole shut - off devices , corrosion monitoring and control, injection depth, and use of tracers) 4000 to 4490 EPA -HQ- OW -2008-0390- 0587 2.5 Mechanical Integrity Testing (internal and external) 4500 to 4546 2.6 Testing and Monitoring (e.g., testing and monitoring plans and required monitoring, including well testing, ground water quality monitoring, CO 2 plume and pres sure front tracking, and air monitoring and/or soil gas monitoring) 4600 to 4670 EPA - HQ - OW -2008-0390- 0588 2.7 Recordkeeping & Reporting (e.g., submissions required for permit applications, operational recordkeeping and reporting, and electronic reporting) 4700 to 4760 EPA - HQ - OW -2008-0390- 0589 2.8 Injection Well Plugging, Post - Injection Site Care, and Site Closure 5000 to 5300 2.9 Financial Responsibility and long - term care requirements 5400 to 5460 EPA - HQ - OW -2008-0390- 0590 2.10 Involving the Public in Permitting Decisions 55 00 to 5560 EPA - HQ - OW -2008-0390- 0583 2.11 Class VI Primacy , including independent primacy for Class VI 5600 2.12 Duration of Class VI Permits 5700 2.13 Emergency and Remedial Response 5800 2.14 Other administrative require ments 5900 3. Cost and Benefits of the Proposed Rule 6000 to 6300 EPA - HQ - OW -2008-0390- 0591 4. Statutory and Executive Orders 7000 to 8000

### Attachment 1: Reference table for locating EPA’s responses to individual comments on the proposed GS rule (73 FR 43492)

Commenter Docket ID - Comment Docket ID – EPA Response A. J. Mayer International on behalf of the American Energy Security Initiative EPA - HQ - OW - 2008 - 0390 - 0230 EPA - HQ - OW - 2008 - 0390 - 060 7 Alston & Bird LLP EPA - HQ - OW - 2008 - 0390 - 0261 EPA - HQ - OW - 2008 - 0390 - 061 0 Ameren Corporation EPA - HQ - OW - 2008 - 0390 - 0198 EPA - HQ - OW - 2008 - 0390 - 070 3 Ameren Corporation on behalf of USWAG – copy of testimony at Denver hearing EPA - HQ - OW - 2008 - 0390 - 0111 EPA - HQ - OW - 2008 - 0390 -0 59 7 American Electric Power (AEP) EPA - HQ - OW - 2008 - 0390 - 0294 EPA - HQ - OW - 2008 - 0390 - 060 9 American Gas Association EPA - HQ - OW - 2008 - 0390 - 0228 EPA - HQ - OW - 2008 - 0390 - 06 11 American Petroleum Institute EPA - HQ - OW - 2008 - 0390 - 0170 EPA - HQ - OW - 2008 - 0390 - 070 2 American Petroleum Institute EPA - HQ - OW - 2008 - 0390 - 0191 EPA - HQ - OW - 2008 - 0390 - 070 9 American Petroleum Institute (API) EPA - HQ - OW - 2008 - 0390 - 0289 EPA - HQ - OW - 2008 - 0390 - 061 5 American Petroleum Institute (API), on behalf of Multi - Stakeholder Discussion (MSD) group EPA - HQ - OW - 2008 - 0390 - 0290 EPA - HQ - OW - 2008 - 0390 - 06 12 American Petroleum Institute (API), on behalf of Multi - Stakeholder Discussion (MSD) group EPA - HQ - OW - 2008 - 0390 - 0298 EPA - HQ - OW - 2008 - 0390 - 061 3 American Public Power Association EPA - HQ - OW - 2008 - 0390 - 0169 EPA - HQ - OW - 2008 - 0390 - 071 0 American Water Works Association (AWWA) EPA - HQ - OW - 2008 - 0390 - 0181 EPA - HQ - OW - 2008 - 0390 - 071 3 American Water Works Association (AWWA); American Public Power Association (APPA) EPA - HQ - OW - 2008 - 0390 - 0204 EPA - HQ - OW - 2008 - 0390 - 071 4 Anadarko Petroleum Corporation EPA - HQ - OW - 2008 - 0390 - 0200 EPA - HQ - OW - 2008 - 039 0- 07 06 Anonymous Public Comment EPA - HQ - OW - 2008 - 0390 - 0101 EPA - HQ - OW - 2008 - 0390 - 059 8 Anonymous Public Comment EPA - HQ - OW - 2008 - 0390 - 0288 EPA - HQ - OW - 2008 - 0390 - 061 4 Anonymous public comment EPA - HQ - OW - 2008 - 0390 - 0138 EPA - HQ - OW - 2008 - 0390 - 0599 Anonymous public comment EPA - HQ - OW - 2008 - 0390 - 0147 EPA - HQ - OW - 2008 - 0390 - 060 0 Anonymous public comment EPA - HQ - OW - 2008 - 0390 - 0194 EPA - HQ - OW - 2008 - 0390 - 070 7 Anonymous public comment EPA - HQ - OW - 2008 - 0390 - 0195 EPA - HQ - OW - 2008 - 0390 - 070 8 Arizona Department of Environmen tal Quality (ADEQ) EPA - HQ - OW - 2008 - 0390 - 0286 EPA - HQ - OW - 2008 - 0390 - 06 08 Arizona Public Service Company EPA - HQ - OW - 2008 - 0390 - 0187 EPA - HQ - OW - 2008 - 0390 - 071 1 Association of Metropolitan Water Agencies (AMWA) EPA - HQ - OW - 2008 - 0390 - 0206 EPA - HQ - OW - 2008 - 0390 - 070 4 Ass ociation of Metropolitan Water Agencies (AMWA) EPA - HQ - OW - 2008 - 0390 - 0213 EPA - HQ - OW - 2008 - 0390 - 070 5 Association of State Drinking Water Administrators (ASDWA) EPA - HQ - OW - 2008 - 0390 - 0172 EPA - HQ - OW - 2008 - 0390 - 071 2 B. Sachau EPA - HQ - OW - 2008 - 0390 - 0105 EPA - HQ - OW - 2008 - 0390 - 060 1 Bardwell Consulting EPA - HQ - OW - 2008 - 0390 - 0115 EPA - HQ - OW - 2008 - 0390 -0 592 Basin Electric Power Cooperative (BEPC) EPA - HQ - OW - 2008 - 0390 - 0260 EPA - HQ - OW - 2008 - 0390 - 061 8 Battelle Energy Technology (BET) EPA - HQ - OW - 2008 - 0390 - 0229 EPA - HQ - OW - 2008 - 0390 - 061 7 Blue Source EPA - HQ - OW - 2008 - 0390 - 0232 EPA - HQ - OW - 2008 - 0390 - 061 9 BP Alternative Energy – copy of testimony at Chicago hearing EPA - HQ - OW - 2008 - 0390 - 0116 EPA - HQ - OW - 2008 - 0390 -0 593 BP Alternative Energy – copy of testimony at Chicago hearing EPA - HQ - OW - 2008 - 0390 - 0118 EPA - HQ - OW - 2008 - 0390 - 059 4 BP Alternative Energy North America, Inc. (BP) EPA - HQ - OW - 2008 - 0390 - 0225 EPA - HQ - OW - 2008 - 0390 - 071 5 Bureau of Water, Division of Environment, Kansas Department of Health & Environment EPA - HQ - OW - 2008 - 0390 - 0108 EPA - HQ - OW - 2008 - 0390 - 059 5 Camco International EPA - HQ - OW - 2008 - 0390 - 0112 EPA - HQ - OW - 2008 - 0390 - 060 2Commenter Docket ID - Comment Docket ID – EPA Response Canitron Systems Inc. EPA - HQ - OW - 2008 - 0390 - 0120 EPA - HQ - OW - 2008 - 0390 - 060 3 Carbon Capture and Storage Alliance EPA - HQ - OW - 2008 - 0390 - 0178 EPA - HQ - OW - 2008 - 0390 - 071 7 Car bon Sequestration Council EPA - HQ - OW - 2008 - 0390 - 0190 EPA - HQ - OW - 2008 - 0390 - 071 6 Carnegie Mellon University on behalf of the CCS Reg Project EPA - HQ - OW - 2008 - 0390 - 0233 EPA - HQ - OW - 2008 - 0390 - 062 0 Chesapeake Energy EPA - HQ - OW - 2008 - 0390 - 0271 EPA - HQ - OW - 2008 - 0390 - 062 1 Chicago Public Hearing Transcript EPA - HQ - OW - 2008 - 0390 - 0185 EPA - HQ - OW - 2008 - 0390 - 072 0 Clean Air Task Force EPA - HQ - OW - 2008 - 0390 - 0250 EPA - HQ - OW - 2008 - 0390 - 062 3 Clean Air Task Force (CATF) EPA - HQ - OW - 2008 - 0390 - 0292 EPA - HQ - OW - 2008 - 0390 - 062 2 Clean Coal Technology Foundation of Texas EPA - HQ - OW - 2008 - 0390 - 0254 EPA - HQ - OW - 2008 - 0390 - 062 4 Coal Utilization Research Council EPA - HQ - OW - 2008 - 0390 - 0227 EPA - HQ - OW - 2008 - 0390 - 062 5 Coal Utilization Research Council EPA - HQ - OW - 2008 - 0390 - 0255 See response to duplicate submittal a t: EPA - HQ - OW - 2008 - 0390 - 06 25 Colorado Department of Public Health and Environment EPA - HQ - OW - 2008 - 0390 - 0182 EPA - HQ - OW - 2008 - 0390 - 071 8 Colorado Ground Water Association (CGWA) EPA - HQ - OW - 2008 - 0390 - 0196 EPA - HQ - OW - 2008 - 0390 - 071 9 Connecticut Department of Publi c Health EPA - HQ - OW - 2008 - 0390 - 0283 EPA - HQ - OW - 2008 - 0390 - 062 6 ConocoPhillips EPA - HQ - OW - 2008 - 0390 - 0192 EPA - HQ - OW - 2008 - 0390 - 072 1 Council of Industrial Boiler Owners (CIBO) EPA - HQ - OW - 2008 - 0390 - 0139 EPA - HQ - OW - 2008 - 0390 - 060 4 Dallas County Park Cities Municipal Utility District EPA - HQ - OW - 2008 - 0390 - 0119 EPA - HQ - OW - 2008 - 0390 - 060 5 Denbury Resources, Inc. (DRI) EPA - HQ - OW - 2008 - 0390 - 0215 EPA - HQ - OW - 2008 - 0390 - 072 3 Denver Public Hearing Transcript EPA - HQ - OW - 2008 - 0390 - 0256 EPA - HQ - OW - 2008 - 0390 - 0758 Dominion EPA - HQ - OW - 200 8- 0390 - 0175 EPA - HQ - OW - 2008 - 0390 - 072 4 DTE Energy EPA - HQ - OW - 2008 - 0390 - 0160 EPA - HQ - OW - 2008 - 0390 - 060 6 DTE Energy EPA - HQ - OW - 2008 - 0390 - 0197 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 060 6 Duke Energy EPA - HQ - OW - 2008 - 0390 - 0209 EPA - HQ - OW - 2008 - 0390 - 072 5 Eastman Chemical Company EPA - HQ - OW - 2008 - 0390 - 0210 EPA - HQ - OW - 2008 - 0390 - 072 6 Edison Electric Institute EPA - HQ - OW - 2008 - 0390 - 0177 EPA - HQ - OW - 2008 - 0390 - 072 7 Electric Power Research Institute (EPRI) EPA - HQ - OW - 2008 - 0390 - 0168 EPA - HQ - OW - 2008 - 0390 - 072 9 El ectric Power Research Institute (EPRI) EPA - HQ - OW - 2008 - 0390 - 0285 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 072 9 Environmental Defense Fund (EDF) EPA - HQ - OW - 2008 - 0390 - 0295 EPA - HQ - OW - 2008 - 0390 - 066 8 Environmental Defense Fund (EDF) EPA - HQ - OW - 2008 - 0390 - 0293 EPA - HQ - OW - 2008 - 0390 - 066 9 Environmental Defense Fund (EDF) EPA - HQ - OW - 2008 - 0390 - 0296 EPA - HQ - OW - 2008 - 0390 - 067 0 ExxonMobil Production Company (a Division of Exxon Mobil Corporation) EPA - HQ - OW - 2008 - 0390 - 0257 EPA - HQ - OW - 2008 - 0390 -0 67 1 Faske n Oil and Ranch, LTD EPA - HQ - OW - 2008 - 0390 - 0281 EPA - HQ - OW - 2008 - 0390 -0 67 2 Fond du Lac Band of Lake Superior EPA - HQ - OW - 2008 - 0390 - 0273 EPA - HQ - OW - 2008 - 0390 -0 67 4 FutureGen Alliance (FGIA) EPA - HQ - OW - 2008 - 0390 - 0167 EPA - HQ - OW - 2008 - 0390 - 073 0 G. C. Blount EPA - HQ - OW - 2008 - 0390 - 0107 EPA - HQ - OW - 2008 - 0390 - 062 8 Gasification Technologies Council (GTC) EPA - HQ - OW - 2008 - 0390 - 0158 EPA - HQ - OW - 2008 - 0390 - 063 3 Global Energy, Inc. EPA - HQ - OW - 2008 - 0390 - 0141 EPA - HQ - OW - 2008 - 0390 - 062 9 Great River Energy EPA - HQ - OW - 2008 - 0390 - 0171 EPA -HQ- OW - 2008 - 0390 - 073 1 Greater Houston Partnership (GHP) EPA - HQ - OW - 2008 - 0390 - 0155 EPA - HQ - OW - 2008 - 0390 - 063 0 Greenpeace International EPA - HQ - OW - 2008 - 0390 - 0129 EPA - HQ - OW - 2008 - 0390 - 063 1 Ground Water Protection Council (GWPC) EPA - HQ - OW - 2008 - 0390 - 0259 EPA -HQ- OW - 2008 - 0390 -0 67 5 Ground Water Protection Council (GWPC) EPA - HQ - OW - 2008 - 0390 - 0297 EPA - HQ - OW - 2008 - 0390 - 067 6 Group Against Smog and Pollution, Inc. (GASP) EPA - HQ - OW - 2008 - 0390 - 0110 EPA - HQ - OW - 2008 - 0390 - 063 2Commenter Docket ID - Comment Docket ID – EPA Response Harvard Law School's Environmental Law & Po licy Clinic EPA - HQ - OW - 2008 - 0390 - 0183 EPA - HQ - OW - 2008 - 0390 - 073 2 Harvard Law School's Environmental Law & Policy Clinic EPA - HQ - OW - 2008 - 0390 - 0287 See response to revised submi ttal at: EPA - HQ - OW - 2008 - 0390 - 073 2 Holliday Environmental Services, Inc. EPA - HQ - OW - 2008 - 0390 - 0114 EPA - HQ - OW - 2008 - 0390 - 063 4 Holliday Environmental Services, Inc. EPA - HQ - OW - 2008 - 0390 - 0127 EPA - HQ - OW - 2008 - 0390 - 063 5 Holliday Environmental Services, Inc. EPA - HQ - OW - 2008 - 0390 - 0106 See response to duplicate submittal at: EPA - HQ - OW - 2008 - 0390 -0634 Holliday Environmental Services, Inc. EPA - HQ - OW - 2008 - 0390 - 0113 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 063 4 Holliday Environmental Services, Inc. EPA - HQ - OW - 2008 - 0390 - 0128 See response to revised submittal at: EPA - HQ - OW - 2008 - 0390 - 063 5 Hydrogen Energy International EPA - HQ - OW - 2008 - 0390 - 0224 EPA - HQ - OW - 2008 - 0390 - 073 3 Hydrogen Energy International – copy of testimony at Chicago hearing EPA - HQ - OW - 2008 - 0390 - 0117 EPA - HQ - OW - 2008 - 0390 - 063 6 Illinois Stage Geological Survey EPA - HQ - OW - 2008 - 0390 - 0180 EPA - HQ - OW - 2008 - 0390 - 073 4 Illinois Stage Geological Survey EPA - HQ - OW - 2008 - 0390 - 0221 EPA - HQ - OW - 2008 - 0390 - 073 5 Independent Petroleum Association of America et al. EPA - HQ - OW - 2008 - 0390 - 0179 EPA - HQ - OW - 2008 - 0390 - 073 6 Indiana Department of Natural Re sources (IDNR) EPA - HQ - OW - 2008 - 0390 - 0236 EPA - HQ - OW - 2008 - 0390 - 0677 Indiana Department of Natural Resources (IDNR) EPA - HQ - OW - 2008 - 0390 - 0245 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0677 Indiana Department of Natural Resources (IDNR) EPA -HQ- OW - 2008 - 0390 - 0275 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0677 Inter Tribal Council of Michigan, Inc. EPA - HQ - OW - 2008 - 0390 - 0284 EPA - HQ - OW - 2008 - 0390 - 0678 Interstate Oil and Gas Compact Commission (IOGCC) EPA - HQ - OW - 2008 - 0390 - 0263 E PA - HQ - OW - 2008 - 0390 -0 679 Joint Global Change Research Institute, Pacific Northwest National Laboratory EPA - HQ - OW - 2008 - 0390 - 0156 EPA - HQ - OW - 2008 - 0390 - 0648 Joint Global Change Research Institute, Pacific Northwest National Laboratory EPA - HQ - OW - 2008 - 0390 - 0164 See response to revised submi ttal at: EPA - HQ - OW - 2008 - 0390 - 064 8 Joint Global Change Research Institute, Pacific Northwest National Laboratory EPA - HQ - OW - 2008 - 0390 - 0165 See response to revised submi ttal at: EPA - HQ - OW - 2008 - 0390 - 064 8 Joint Global Change Rese arch Institute, Pacific Northwest National Laboratory EPA - HQ - OW - 2008 - 0390 - 0208 See response to revised submittal at: EPA - HQ - OW - 2008 -0 390 - 064 8 Kansas Corporation Commission – copy of testimony at Denver hearing EPA - HQ - OW - 2008 - 0390 - 0121 EPA - HQ - OW - 2008 - 0390 - 0596 Kentucky Public Service Commission EPA - HQ - OW - 2008 - 0390 - 0231 EPA - HQ - OW - 2008 - 0390 - 0680 Kentucky Public Service Commission EPA - HQ - OW - 2008 - 0390 - 0269 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0680 L. L. Smith EPA - HQ - OW - 2008 -0 390 - 0136 EPA - HQ - OW - 2008 - 0390 - 063 8 Lawrence Berkeley National Laboratory (Berkeley Lab) U.S. Department of Energy EPA - HQ - OW - 2008 - 0390 - 0149 EPA - HQ - OW - 2008 - 0390 - 063 7 Lignite Energy Council (LEC) EPA - HQ - OW - 2008 - 0390 - 0162 EPA - HQ - OW - 2008 - 0390 - 063 9 Mendocino County Water Agency, State of California EPA - HQ - OW - 2008 - 0390 - 0102 EPA - HQ - OW - 2008 - 0390 - 064 1 Metropolitan Water District of Southern California (MWDSC) EPA - HQ - OW - 2008 - 0390 - 0279 EPA - HQ - OW - 2008 - 0390 - 0683 Michigan Department of Environmental Quality (MDEQ) EPA - HQ - OW - 2008 - 0390 - 0264 EPA - HQ - OW - 2008 - 0390 - 0681 Midwestern Governors Association (MGA) EPA - HQ - OW - 2008 - 0390 - 0159 EPA - HQ - OW - 2008 - 0390 - 0642Commenter Docket ID - Comment Docket ID – EPA Response Midwestern Governors Association (MGA) EPA - HQ - OW - 2008 - 0390 - 0199 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 064 2 Montana Department of Environmental Quality (MDEQ) EPA - HQ - OW - 2008 - 0390 - 0152 EPA - HQ - OW - 2008 - 0390 - 0640 Montana Department of Environmental Quality (MDEQ) EPA - HQ - OW - 2008 - 0390 - 0268 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 064 0 Montana - Dakota Utilities Co. EPA - HQ - OW - 2008 - 0390 - 0235 EPA - HQ - OW - 2008 - 0390 - 0682 National Association of Manufacturers (NAM) EPA - HQ - OW - 2008 - 0390 - 0258 EPA - HQ - OW - 2008 - 0390 -0 685 National Association of Manufacturers (NAM) EPA - HQ - OW - 2008 - 0390 - 02 77 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0685 National Ground Water Association EPA - HQ - OW - 2008 - 0390 - 0142 EPA - HQ - OW - 2008 - 0390 - 0644 National Rural Electric Cooperative Association (NRECA) EPA - HQ - OW - 2008 - 0390 - 0163 EPA - HQ - OW - 2008 - 0390 - 0643 National Rural Electric Cooperative Association (NRECA) EPA - HQ - OW - 2008 - 0390 - 0276 See response to duplicate submittal at: EPA - HQ - OW - 2008 - 0390 - 0643 National Tribal Air Association EPA - HQ - OW - 2008 - 0390 - 0126 EPA - HQ - OW - 2008 - 0390 - 0645 Natural Resources Defense Council (NRDC) EPA - HQ - OW - 2008 - 0390 - 0291 EPA - HQ - OW - 2008 - 0390 - 0686 Natural Resources Defense Council (NRDC) EPA - HQ - OW - 2008 - 0390 - 0272 EPA - HQ - OW - 2008 - 0390 - 0689 Natural Resources Defense Council (NRDC) EPA - HQ - OW - 2008 - 0390 - 0251 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0689 Nevada Division of Environmental Protection, Bureau of Water Pollution Control EPA - HQ - OW - 2008 - 0390 - 0222 EPA - HQ - OW - 2008 - 0390 - 0738 New Mexico Oil Conservation Division (NMOCD) EPA - HQ - OW - 2008 - 0390 - 0237 EPA - HQ - OW - 2008 - 0390 - 0687 New York State Dept. of Environmental Conservation Div. of Mineral Resources EPA - HQ - OW - 2008 - 0390 - 0186 EPA - HQ - OW - 2008 - 0390 -0 740 NiSource, Inc. EPA - HQ - OW - 2008 - 0390 - 0188 EPA - HQ - OW - 2008 - 0390 - 0739 North American Carbon Capture and Storage Associati on (NACCSA) EPA - HQ - OW - 2008 - 0390 - 0265 EPA - HQ - OW - 2008 - 0390 - 0684 North American Coal Corporation (NAC) EPA - HQ - OW - 2008 - 0390 - 0214 EPA - HQ - OW - 2008 - 0390 - 0737 North Dakota Industrial Commission EPA - HQ - OW - 2008 - 0390 - 0241 EPA - HQ - OW - 2008 - 0390 - 0688 NRG Energy, I nc. EPA - HQ - OW - 2008 - 0390 - 0234 EPA - HQ - OW - 2008 - 0390 - 0696 Oglethorpe Power Corporation EPA - HQ - OW - 2008 - 0390 - 0189 EPA - HQ - OW - 2008 - 0390 - 0741 Oklahoma Corporation Commission EPA - HQ - OW - 2008 - 0390 - 0247 EPA - HQ - OW - 2008 - 0390 - 0691 Oklahoma Department of Environmental Q uality (DEQ) EPA - HQ - OW - 2008 - 0390 - 0218 EPA - HQ - OW - 2008 - 0390 - 0722 Oklahoma Independent Petroleum Association EPA - HQ - OW - 2008 - 0390 - 0239 E PA - HQ - OW - 2008 - 0390 - 0690 Old Dominion Electric Cooperative (ODEC) EPA - HQ - OW - 2008 - 0390 - 0146 EPA - HQ - OW - 2008 - 0390 - 0646 Oregon Water Resources Department EPA - HQ - OW - 2008 - 0390 - 0270 EPA - HQ - OW - 2008 - 0390 - 0692 Pacific Northwest National Laboratory EPA - HQ - OW - 2008 - 0390 - 0207 EPA - HQ - OW - 2008 - 0390 - 0742 Peabody Energy EPA - HQ - OW - 2008 - 0390 - 0262 EPA - HQ - OW - 2008 - 0390 - 0693 Pennsylvania Dept . of Environmental Protection EPA - HQ - OW - 2008 - 0390 - 0130 EPA - HQ - OW - 2008 - 0390 - 064 7 Praxair Services, Inc. EPA - HQ - OW - 2008 - 0390 - 0144 EPA - HQ - OW - 2008 - 0390 - 064 9 Railroad Commission of Texas (RRC) EPA - HQ - OW - 2008 - 0390 - 0122 EPA - HQ - OW - 2008 - 0390 - 065 0 San Miguel Elec tric Cooperative, Inc EPA - HQ - OW - 2008 - 0390 - 0161 EPA - HQ - OW - 2008 - 0390 - 065 1 San Miguel Electric Cooperative, Inc. EPA - HQ - OW - 2008 - 0390 - 0274 See response to duplicate submittal at: EPA - HQ - OW - 2008 - 0390 - 065 1 Sandia Technologies, LLC EPA - HQ - OW - 2008 - 0390 - 0238 EPA - HQ - OW - 2008 - 0390 - 069 4 Sandridge Energy Corporation EPA - HQ - OW - 2008 - 0390 - 0219 EPA - HQ - OW - 2008 - 0390 - 0743 Schlumberger Carbon Services EPA - HQ - OW - 2008 - 0390 - 0226 EPA - HQ - OW - 2008 - 0390 - 0744Commenter Docket ID - Comment Docket ID – EPA Response Shell Exploration and Production Company (SEPCo) EPA - HQ - OW - 2008 - 0390 - 0211 EPA - HQ - OW - 2008 - 0390 - 0745 Sierra Club National Global Warming and Energy Committee EPA - HQ - OW - 2008 - 0390 - 0267 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 065 3 Sierra Club National Global Warming and Energy Committee and Sierra Club Ca lifornia Nevada Regional Conservation Committee on Energy and Climate Change EPA - HQ - OW - 2008 - 0390 - 0133 EPA - HQ - OW - 2008 - 0390 - 065 3 Sierra Club National Global Warming and Energy Committee and Sierra Club California Nevada Regional Conservation Committee on En ergy and Climate Change EPA - HQ - OW - 2008 - 0390 - 0140 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 065 3 Sierra Club National Global Warming and Energy Committee and Sierra Club California Nevada Regional Conservation Committee on Energy and Clim ate Change EPA - HQ - OW - 2008 - 0390 - 0154 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 065 3 Sierra Environmental Law Program, Sierra Club EPA - HQ - OW - 2008 - 0390 - 0242 EPA - HQ - OW - 2008 - 0390 - 0695 South Dakota Department of Environment and Natural Resour ces EPA - HQ - OW - 2008 - 0390 - 0153 EPA - HQ - OW - 2008 - 0390 - 065 2 Southern Company EPA - HQ - OW - 2008 - 0390 - 0201 EPA - HQ - OW - 2008 - 0390 - 0746 Southern Company, on behalf of Edison Electric Institute – copy of testimony at Chicago hearing EPA - HQ - OW - 2008 - 0390 - 0109 EPA - HQ - OW -2 008 - 0390 - 062 7 Southern States Energy Board EPA - HQ - OW - 2008 - 0390 - 0176 EPA - HQ - OW - 2008 - 0390 - 0747 Southern States Energy Board EPA - HQ - OW - 2008 - 0390 - 0174 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0747 Spectra Energy Corp EPA - HQ - OW - 2008 - 0390 -0 151 EPA - HQ - OW - 2008 - 0390 - 065 4 State of Wyoming EPA - HQ - OW - 2008 - 0390 - 0150 EPA - HQ - OW - 2008 - 0390 - 065 5 State of Wyoming EPA - HQ - OW - 2008 - 0390 - 0282 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 065 5 SUEZ Energy Generation NA, LLC EPA - HQ - OW - 2008 - 039 0- 0131 EPA - HQ - OW - 2008 - 0390 - 065 6 Tampa Electric Company EPA - HQ - OW - 2008 - 0390 - 0212 EPA - HQ - OW - 2008 - 0390 - 0748 Tennessee Valley Authority EPA - HQ - OW - 2008 - 0390 - 0145 EPA - HQ - OW - 2008 - 0390 - 065 8 Texas Carbon Capture and Storage Association EPA - HQ - OW - 2008 - 0390 - 0223 E PA - HQ - OW - 2008 - 0390 - 0749 Texas Commission on Environmental Quality (TCEQ) EPA - HQ - OW - 2008 - 0390 - 0280 EPA - HQ - OW - 2008 - 0390 - 0697 Texas Independent Producers and Royalty Owners Association (TIPRO) EPA - HQ - OW - 2008 - 0390 - 0184 EPA - HQ - OW - 2008 - 0390 - 0750 Texas Pipeli ne Association (TPA) EPA - HQ - OW - 2008 - 0390 - 0143 EPA - HQ - OW - 2008 - 0390 - 065 7 The Center of Environment, Energy & Natural Resources Law, University of Houston Law Center EPA - HQ - OW - 2008 - 0390 - 0103 EPA - HQ - OW - 2008 - 0390 - 065 9 The Energy and Environmental Research Ce nter at the University of North Dakota EPA - HQ - OW - 2008 - 0390 - 0220 EPA - HQ - OW - 2008 - 0390 - 072 8 The Energy and Environmental Research Center at the University of North Dakota EPA - HQ - OW - 2008 - 0390 - 0252 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 07 28 The Fertilizer Institute (TFI) EPA - HQ - OW - 2008 - 0390 - 0266 EPA - HQ - OW - 2008 - 0390 - 0673 Tri - State Generation and Transmission Association, Inc. EPA - HQ - OW - 2008 - 0390 - 0216 EPA - HQ - OW - 2008 - 0390 - 0751 Tri - State Generation and Transmission Association, Inc. EPA - HQ - OW - 2008 - 0390 - 0278 See response to duplicate submit tal at: EPA - HQ - OW - 2008 - 0390 - 0751Commenter Docket ID - Comment Docket ID – EPA Response U.S. Chamber of Commerce EPA - HQ - OW - 2008 - 0390 - 0148 EPA - HQ - OW - 2008 - 0390 - 066 0 Underground Injection Technology Group (UIT Group) EPA - HQ - OW - 2008 - 0390 - 0243 EPA - HQ - OW - 2008 - 0390 -0 698 Underground Injection Technology Group (UIT Group) EPA - HQ - OW - 2008 - 0390 - 0244 See response to duplicate submittal at: EPA - HQ - OW - 2008 - 0390 - 0698 Underground Injection Technology Group (UIT Group) EPA - HQ - OW - 2008 - 0390 - 0246 See response to duplicate s ubmit tal at: EPA - HQ - OW - 2008 - 0390 - 0698 United States Geological Survey (USGS) EPA - HQ - OW - 2008 - 0390 - 0166 EPA - HQ - OW - 2008 - 0390 - 0752 University of Utah Energy and Geoscience Institute on behalf of the Southwest Regional Partnership EPA - HQ - OW - 2008 - 0390 - 0134 EP A - HQ - OW - 2008 - 0390 - 066 1 Utah Division of Oil, Gas, and Mining EPA - HQ - OW - 2008 - 0390 - 0193 EPA - HQ - OW - 2008 - 0390 - 0753 Utah Division of Water Quality EPA - HQ - OW - 2008 - 0390 - 0253 EPA - HQ - OW - 2008 - 0390 - 0699 Utility Solid Waste Activities Group (USWAG) EPA - HQ - OW - 2008 -0 390 - 0173 EPA - HQ - OW - 2008 - 0390 - 0754 Virginia Department of Environmental Quality (DEQ) EPA - HQ - OW - 2008 - 0390 - 0157 EPA - HQ - OW - 2008 - 0390 - 066 2 W. J. Curran EPA - HQ - OW - 2008 - 0390 - 0137 EPA - HQ - OW - 2008 - 0390 - 066 3 Washington State, Department of Ecology EPA - HQ - OW - 2008 - 0390 - 0123 EPA - HQ - OW - 2008 - 0390 - 066 4 Washington State, Department of Ecology EPA - HQ - OW - 2008 - 0390 - 0202 See response to duplicate submi ttal at: EPA - HQ - OW - 2008 - 0390 - 066 4 Water Environment Association of Texas (WEAT) EPA - HQ - OW - 2008 - 0390 - 0203 EPA - HQ - OW - 2008 - 0390 - 0755 Western Business Roundtable EPA - HQ - OW - 2008 - 0390 - 0249 EPA - HQ - OW - 2008 - 0390 - 0700 Western Energy Supply and Transmission Associates EPA - HQ - OW - 2008 - 0390 - 0248 EPA - HQ - OW - 2008 - 0390 - 070 1 Western Organization of Resource Councils EPA - HQ - OW - 2008 - 0390 - 0 240 EPA - HQ - OW - 2008 - 0390 - 061 6 Wisconsin Dept. of Natural Resources (WDNR) EPA - HQ - OW - 2008 - 0390 - 0135 EPA - HQ - OW - 2008 - 0390 - 066 5 World Resources Institute (WRI) EPA - HQ - OW - 2008 - 0390 - 0124 EPA - HQ - OW - 2008 - 0390 - 066 6 Wyoming Department of Environmental Quality (DEQ ) EPA - HQ - OW - 2008 - 0390 - 0205 EPA - HQ - OW - 2008 - 0390 - 0756 Wyoming State Geological Survey EPA - HQ - OW - 2008 - 0390 - 0132 EPA - HQ - OW - 2008 - 0390 - 066 7 Xcel Energy, Inc. EPA - HQ - OW - 2008 - 0390 -0 217 EPA - HQ - OW - 2008 - 0390 - 0757

### Attachment 2: Topic - specific comment codes for the proposed GS rule (73 FR 43492) Comment Code Description Code 1. General and Administrative Comments 1000 1.1 General comments about the rulemaking 1200 1.1.1 Comments about the proposed rule 1210 1.1.1.1 Terminology and definitions 1220 1.1.1.2 Gene ral comments on the regulatory text 1230 1.1.1.3 Suggested changes/edits to rule language 1240 1.1.1.4 Flexibility is needed (performance - based standards) 1250 1.1.1.5 More certainty/stringency is needed 1260 1.1.2 Comments on other rules/issues 1270 1.1.2.1 General comments on climate change/ global warming 1280 1.1.2.2 Comments that EPA should regulate CO2 as a pollutant 1290 1.1.2.3 Comments on other aspects of CCS (capture, transport) 1300 1.1.2.4 Comments on other "out of scope" issues, e.g., pore space ownership 1310 1.1.3 General comments about GS 1320 1.1.3.1 Support use of GS in general 1330 1.1.3.2 Oppose use of GS in general 1340 1.1.3.3 Comments on the need for GS technology 1350 1.1.3.4 Effectiveness of trapping mechanisms 1360 1.1 .3.5 US storage capacity 1370 1.1.3.6 Deployment of GS 1380 1.1.4 Comments on materials in the rulemaking docket 1390 1.2 Comments on EPA's Authority to Regulate Injection of CO2 1400 1.2.1 Comments in support of EPA/rulemaking 1410 1.2.1.1 Support th e GS rulemaking 1420 1.2.1.2 Support EPA's authority to regulate CO2 injection 1430 1.2.1.3 EPA should develop guidance 1435 1.2.2 Comments opposing EPA/rulemaking 1440 1.2.2.1 Oppose the GS rulemaking 1450 1.2.2.2 Oppose EPA's authority to regulate CO2 injection 1460 1.2.2.2.1 CO2 injection is exempt from UIC 1470 1.2.2.2.2 CO2 is not a pollutant 1480 1.2.2.2.3 CO2 is not a fluid 1490 1.2.2.2.4 Some other agency should regulate GS 1500 1.2.2.3 Need for additional study 1510 1.2.3 Other authoriti es (e.g., CAA, MPRSA, London Convention) 1520 1.2.3.1 State regulatory efforts on GS 1530 1.2.3.2 Climate change legislation 1540 1.3 Risk Associated with CO2 GS 1600 1.3.1 Risks to USDWs 1610 1.3.1.1 Leaching and mobilization of contaminants; reacti ons in injection zone 1612 1.3.1.2 Impurities in captured CO2; purity standards for CO2 1614 1.3.1.3 Fluid movement 1616 1.3.1.4 Impacts on drinking water treatment 1618 1.3.2 Induced seismicity 1620 1.3.3 RCRA/hazardous waste issues 1630 1.3.4 CERC LA issues 1640 1.3.5 Human health impacts 1650 1.3.5.1 Concerns about Lake Nyos and Mammoth Mountain - type events 1655Comment Code Description Code 1.3.6 Ecosystem impacts (soil, air, surface water) 1660 1.3.7 Other/miscellaneous risks 1670 1.3.8 Don't overstate risk, don't stigm atize CO2 1680 1.4 Scientific Background/Informing the Proposal 1800 1.4.1 Research on identifying risks to USDWs 1810 1.4.1.1 Vulnerability Evaluation Framework (VEF) 1820 1.4.1.2 Lawrence Berkeley National Laboratory (LBNL) research 1830 1.4.1.3 Oth er research 1840 1.4.2 CO2 GS Field Research 1850 1.4.2.1 DOE Regional Carbon Sequestration Partnerships 1852 1.4.2.2 Other Pilot Projects 1854 1.4.2.3 Other U.S. Research (Princeton University, MIT) 1856 1.4.2.4 International GS efforts 1858 1.4.3 Technical workshops 1900 1.4.4 Stakeholder outreach 1910 1.4.4.1 Public stakeholder meetings 1920 1.4.4.2 Consultations with State, Tribal, and local Associations (e.g., GWPC, IOGCC) 1930 1.4.4.3 Consultations with Industry; experience with other wells 1940 1.4.4.4 Consultations with electric and water utilities 1950 1.4.4.5 Consultations with NGOs, e.g., environmental and citizens groups 1960 1.4.4.6 Need for other consultations 1970 1.4.5 EPA's Technical Guidance for Pilot GS Projects 1980 1.5 Nee d for a New Class of Injection Well 2000 1.5.1 Support Class VI designation 2020 1.5.2 Oppose Class VI designation 2040 1.5.2.1 Oppose Class VI/ Support Class I 2042 1.5.2.2 Oppose Class VI/ Support Class II 2044 1.5.2.3 Continuing to classify CO2 injection for EOR/EGR as Class II/ dividing line between Class II and VI 2046 1.5.2.4 Oppose Class VI/ Support Class V experimental technology well 2048 1.5.3 Comments on grandfathering of existing wells 2060 1.5.3.1 Grandfathering construction of Class I wells 2062 1.5.3.2 Grandfathering construction of Class II wells 2064 1.5.3.3 Grandfathering construction of Class V wells 2066 1.6 Target Geologic Formations for GS 2100 1.6.1 Deep saline formations 2120 1.6.1.1 Comments in favor of injection in to deep saline 2123 1.6.1.2 Comments opposing injection into deep saline 2126 1.6.2 Depleted oil and gas reservoirs 2140 1.6.2.1 Comments in favor of injection into depleted reservoirs 2143 1.6.2.2 Comments opposing injection into depleted reservoirs 2 146 1.6.3 Unmineable coal seams 2160 1.6.3.1 Comments in favor of injection into unmineable coal seams 2163 1.6.3.2 Comments opposing injection into unmineable coal seams 2166 1.6.4 Other formation types 2200 1.7 Comments on the Alternatives Considere d 2300 1.7.1 Comments on the evaluation process 2310 1.7.2 Comments on Alternative 1 2320 1.7.3 Comments on Alternative 2 2330 1.7.4 Comments on Alternative 4 2340 1.8 Comments on EPA's adaptive rulemaking process 2400Comment Code Description Code 2. Proposed Regulatory Alternat ive 3000 2.1 Proposed Geologic Siting Requirements (40 CFR 146.83) 3100 2.1.1 Proposed siting requirements (i.e., injection/confining zones, trapping mechanism) 3110 2.1.2 Need to identify additional confining and containment zones 3120 2.1.3 Comments that operators should submit more (or different) geologic data than proposed 3130 2.1.4 Comments that the proposed geologic data requirements are too stringent 3140 2.1.5 Comments on required permit information (40 CFR 146.82) 3150 2.2 Proposed Area of Review and Corrective Action Requirements (40 CFR 146.84) 3200 2.2.1 Delineating the AoR/Modeling CO2 movement 3300 2.2.1.1 Comments in favor of requiring computational models to delineate the AoR 3310 2.2.1.2 Comments opposed to requiring computation al models to delineate the AoR 3320 2.2.1.3 Applicability /adequacy of computational models 3330 2.2.1.4 Specific delineation models 3340 2.2.1.5 Use of proprietary models for GS sites 3350 2.2.2 Corrective Action 3400 2.2.2.1 Scope of the inventory process (e.g., reliance on publicly available information, depth of wells) 3420 2.2.2.2 Evaluation of wells in the AoR (e.g., types of data to be reviewed) 3440 2.2.2.3 Acceptable corrective action techniques for GS sites (e.g., cements) 3460 2.2.3 Area of Review Reevaluation 3500 2.2.3.1 AoR reevaluation frequency 3530 2.2.3.2 Conditions that merit reevaluation of the AoR 3560 2.2.4 Phased Corrective Action 3600 2.2.4.1 Comments in favor of allowing phased corrective action 3630 2.2.4.2 Commen ts opposed to allowing phased corrective action 3660 2.2.5 Comments on the requirement for an AoR and corrective action plan 3700 2.3 Proposed Injection Well Construction Requirements (40 CFR 146.86) 3800 2.3.1 Well construction procedures 3820 2.3.1.1 Depth of surface casing 3822 2.3.1.2 Cementing of long - string casing 3824 2.3.1.3 Packer requirements 3826 2.3.2 Horizontal well drilling techniques 3840 2.3.3 Well component degradation 3860 2.3.3.1 Use of corrosion - resistant construction materi als 3862 2.3.3.2 Use of corrosion - resistant cements 3864 2.3.3.3 Logging and testing requirements (40 CFR 146.87) 3866 2.4 Proposed Injection Well Operating Requirements (40 CFR 146.88) 4000 2.4.1 Injection parameters 4100 2.4.1.1 Injection pressure limitations 4110 2.4.1.2 Allowing hydraulic fracturing during GS 4120 2.4.1.3 Appropriateness of using fracturing for well stimulation 4130 2.4.1.4 Use of fracturing for GS in specific geologic settings 4140 2.4.2 Down - hole shut - off valves in GS we lls 4200 2.4.3 Corrosion monitoring and control 4250 2.4.4 Injection Depth 4300 2.4.4.1 Injection beneath the lowermost formation containing a USDW 4320 2.4.4.1.1 Comments in favor of requiring injection below the lowermost USDW 4322 2.4.4.1.2 Commen ts opposed to requiring injection below the lowermost USDW 4324 2.4.4.2 Minimum injection depth 4340 2.4.4.2.1 Comments in favor of setting a minimum injection depth 4342 2.4.4.2.2 Comments opposed to setting a minimum injection depth 4344Comment Code Description Code 2.4.4.3 All owing injection above or between USDWs 4400 2.4.4.3.1 Comments in favor of allowing injection above/between USDWs in certain circumstances 4410 2.4.4.3.2 Comments opposing injection above/between USDWs in all cases 4420 2.4.4.3.3 Injection into coal se ams above USDWs 4430 2.4.4.3.4 Injection into organic - rich shales above USDWs 4440 2.4.4.4 Use of aquifer exemptions 4450 2.4.4.4.1 Comments in favor of allowing aquifer exemptions in certain circumstances 4460 2.4.4.4.2 Comments opposing aquifer exemptions in all cases 4470 2.4.4.4.3 Under what conditions aquifer exemptions should be approved? 4480 2.4.5 Use of tracers and potential impact on human health or ecosystems 4490 2.5 Proposed Mechanical Integrity Testing (MIT) Requirements (40 CFR 146 .89) 4500 2.5.1 Continuous internal mechanical integrity monitoring 4520 2.5.2 Proposed external MIT requirements 4540 2.5.2.1 MIT procedures and methods for GS 4543 2.5.2.2 MIT frequency 4546 2.6 Proposed Plume and Pressure Front Monitoring Requir ements (40 CFR 146.90) 4600 2.6.1 Testing and monitoring plan requirement 4610 2.6.2 Injectate monitoring 4620 2.6.3 Corrosion monitoring 4630 2.6.4 Pressure fall - off testing 4640 2.6.5 CO2 plume and pressure front tracking 4650 2.6.5.1 Plume trac king techniques/geophysical methods 4655 2.6.6 Geochemical monitoring 4660 2.6.7 Surface air monitoring and/or soil gas monitoring 4670 2.7 Proposed Recordkeeping and Reporting Requirements (40 CFR 146.91) 4700 2.7.1 Proposed submissions required for permit applications 4710 2.7.2 Operational recordkeeping and reporting 4720 2.7.3 Reporting associated with closure and post - injection site care 4730 2.7.4 Electronic reporting 4740 2.7.5 Comments on the merit of annual reports 4750 2.7.6 Proposed reporting frequency 4760 2.8 Proposed Well Plugging and Post - Injection Site Care Requirements 5000 2.8.1 Injection well plugging activities (40 CFR 146.92) 5100 2.8.2 Post injection site care (40 CFR 146.93) 5200 2.8.2.1 Post - injection monitoring a ctivities 5220 2.8.2.2 Post injection timeframe 5240 2.8.2.3 Adjusting the post - injection timeframe 5260 2.8.2.4 USDW non - endangerment demonstrations 5280 2.8.3 Site closure activities (40 CFR 146.93) 5300 2.9 Proposed Financial Responsibility and L ong - Term Care Requirements 5400 2.9.1 Comments on proposed financial responsibility requirements (40 CFR 146.85) 5430 2.9.1.1 Need to adjust financial responsibility mechanisms 5432 2.9.1.2 Need for additional instruments 5434 2.9.1.3 Allowing separa te financial demonstrations for plugging and abandonment and post - injection site care 5436 2.9.2 Comments on transfer of liability for long - term care 5460 2.10 Comments on Involving the Public in Permitting Decisions 5500 2.10.1 Appropriateness of existing public participation requirements (Part 25 and Part 124) for GS 5520 2.10.2 Need for additional public participation requirements/ use of new information technology 5540 2.10.3 Enhancing the public participation process 5560Comment Code Description Code 2.11 Comments relate d to UIC Program primacy for Class VI wells 5600 2.11.1 Allowing partial primacy for Class VI wells 5610 2.12 Comments on the proposed duration of Class VI permits 5700 2.13 Comments on emergency and remedial response (40 CFR 146.94) 5800 2.14 Other administrative requirements under 40 CFR 144 5900 3. Cost of the Proposed Rule 6000 3.1 Comments on the cost estimates 6100 3.2 Comments on costing methodology 6200 3.2.1 Comments on the timeframe of the costing analysis 6210 3.2.2 Assumptions about the number of monitoring wells 6220 3.3 Benefits of the proposed rule 6300 4. Statutory and Executive Order Reviews 7000 4.1 Executive Order 12866: Regulatory Planning and Review 7100 4.2 Paperwork Reduction Act 7200 4.3 Regulatory Flexibility Act 7300 4.4 Unfunded Mandates Reform Act 7400 4.5 Executive Order 13132: Federalism 7500 4.6 Executive Order 13175: Tribal Consultation and Coordination 7600 4.7 Executive Order 13045: Children's Health Protection 7700 4.8 Executive Order 13211: Energy Supply, Distribution, or Use 7800 4.9 National Technology Transfer and Advancement Act 7900 4.1 Executive Order 12898: Environmental Justice 8000