| #Q001 | design | health | mandatory | Site characterization requirements | drinking water, other | Site characterization requirements to ensure the geology in the project area can receive and contain the CO2 within the zone where it will be injected, including that the area is free of faults and fractures and that induced seismicity is not a concern. | | high |
| #Q002 | corrective_action | health | mandatory | CO2 plume prediction and corrective action | drinking water, other | Requirements to predict the extent of the injected CO2 plume and associated pressure front for the project using computational modeling, and to identify and address any deficiencies of existing wells within the Area of Review through corrective action. | | high |
| #Q003 | design | health | mandatory | Well construction requirements | drinking water, other | Well construction requirements to ensure the Class VI injection well and in-zone monitoring wells are constructed in a manner that will prevent any CO2 or formation fluids from leaking outside of the injection zone. | | high |
| #Q004 | design | operational | mandatory | Well materials demonstration | drinking water, other | Owners or operators must demonstrate that the well materials are corrosion resistant and compatible with the conditions and fluids to which they may be exposed. | | high |
| #Q005 | design | operational | guidance | Appropriate construction plans methodology | drinking water, other | Laboratory testing and modeling based upon site specific conditions may be used to determine appropriate well construction plans. | | high |
| #Q006 | monitoring | health | mandatory | Testing and monitoring requirements | drinking water, other | Testing and monitoring requirements to monitor the integrity of the injection well, the integrity of other wells such as monitoring wells, groundwater quality, and the movement of the CO2 plume and pressure front. | | high |
| #Q007 | monitoring | operational | mandatory | Corrosion monitoring timeline | drinking water, other | Corrosion monitoring is required from the commencement of CO2 injection through site closure | | high |
| #Q008 | operational | health | mandatory | Operating requirements | drinking water, other | Operating requirements to ensure the injection activity is appropriate to the well’s construction and geologic characteristics so that it will not endanger USDWs or human health. | | high |
| #Q009 | operational | health | mandatory | Injection well plugging | drinking water, other | Requirements to plug the injection well in a manner that will not allow fluid movement that endangers USDWs. | | high |
| #Q010 | administrative | unknown | mandatory | Financial responsibility | drinking water, other | Requirements for the operator to establish and maintain financial instruments sufficient to cover the cost of corrective action, plugging the injection well, post-injection site care, and emergency and remedial response for the GS project (i.e., financial responsibility). | | high |
| #Q011 | administrative | health | mandatory | Emergency and remedial response plan | drinking water, other | Requirements to develop and maintain a site-specific emergency and remedial response plan. | | high |
| #Q012 | reporting | reporting | mandatory | Results reporting | drinking water, other | Requirements for the Class VI well owner or operator to report all testing and monitoring results to the permitting authority to ensure the project is operating in compliance with all permit and regulatory requirements. | | high |
| #Q013 | administrative | operational | recommended | Pre-application community engagement | drinking water, other | EPA recommends applicants engage the local community surrounding their proposed project before applying. | Before applying for a Class VI permit | high |
| #Q014 | administrative | operational | recommended | Early stakeholder engagement | drinking water, other | Applicants should engage stakeholders early in the permitting process to learn about each community’s specific concerns, especially before making any requests of that community. | Early in the permitting process | high |
| #Q015 | administrative | operational | mandatory | Class VI permit requirement | drinking water, other | Each Class VI well requires a permit to construct and operate the well through site closure. | | high |
| #Q016 | administrative | operational | mandatory | Intent notification and meeting | drinking water, other | The prospective owner or operator notifies the permitting authority of their intent to prepare a Class VI permit application and is encouraged to meet with the permitting authority to discuss the permitting process. | Pre-permitting phase | high |
| #Q017 | operational | operational | mandatory | Pre-operation well activities | drinking water, other | If a permit is issued, the Class VI well operator constructs the well, performs pre-operational testing, and submits additional information before they are authorized to inject CO2. | If a permit is issued | high |
| #Q018 | monitoring | operational | mandatory | Injection phase responsibilities | drinking water, other | Owners or operators are responsible for performing testing and monitoring, reevaluating the Area of Review described in the Class VI permit and Project Plans, and submitting the results to the permitting authority. | Injection phase | high |
| #Q019 | operational | health | mandatory | Post-injection well plugging and monitoring | drinking water, other | The Class VI well owner or operator plugs the injection well, monitors the CO2 plume and pressure front, and, after demonstrating USDW non-endangerment, closes the site. | Post-injection phase | high |
| #Q020 | administrative | health | mandatory | Site closure authorization condition | drinking water, other | Site closure may be only authorized after the operator can demonstrate that the project no longer poses an endangerment to USDWs. | Post-injection site closure | high |
| #Q021 | administrative | reporting | mandatory | Notice of Deficiency missing information provision | drinking water, other | NODs are sent to the applicant, who must provide the missing information before the application can be deemed complete. | If a Notice of Deficiency is received | high |
| #Q022 | prohibition | operational | recommended | Permit application changes prohibition | drinking water, other | Once an application is submitted to EPA, applicants should not make changes to the permit application, including the narrative, project plans, or any attachments/appendices, unless direction to do so by EPA. | Once an application is submitted to EPA | high |
| #Q023 | administrative | reporting | mandatory | Request for Additional Information (RAI) response | drinking water, other | RAIs are sent to applicants, who must provide the requested information for the agency to evaluate the suitability of the proposed project. | During the Technical Review if an RAI is sent | high |
| #Q024 | administrative | reporting | recommended | RAI response timeline | drinking water, other | Applicants should respond with 30 days or provide an alternative timeline if necessary to prepare the response. | When an RAI is received | high |
| #Q025 | reporting | reporting | mandatory | Electronic reporting format requirement | drinking water, other | Owners or operators of Class VI wells must submit permit applications and GS project information directly to EPA in an electronic format approved by EPA. | Regardless of whether the project is located in a state with primary enforcement authority | high |
| #Q026 | administrative | operational | mandatory | SWMP Development and Enforcement | other | Owners/operators of regulated municipal separate storm sewer systems (MS4s) are required to develop, implement, and enforce a stormwater management program (SWMP). | | high |
| #Q027 | operational | health | mandatory | Construction Site Runoff Control Program | other | Include a program in your SWMP to reduce pollutants in stormwater runoff to your MS4 from construction activities that disturb ≥ 1 acre of land. | construction activities that disturb ≥ 1 acre of land | high |
| #Q028 | operational | operational | mandatory | Illicit Discharge Detection and Elimination Program | other | Include a program in your SWMP to detect and eliminate illicit discharges to your system. | | high |
| #Q029 | operational | health | mandatory | Pollution Prevention/Good Housekeeping Program | other | Include a program to prevent or reduce pollutant runoff from municipal operations into the storm sewer system. | | high |
| #Q030 | operational | health | mandatory | Post-Construction Runoff Control Program | other | Include a program to reduce pollutants from new development and redevelopment projects that disturb ≥ 1 acre of land. | new development and redevelopment projects that disturb ≥ 1 acre of land | high |
| #Q031 | administrative | operational | mandatory | Public Education and Outreach Program | other | Implement a public education program on the impacts of stormwater that includes steps to reduce pollutants in stormwater runoff. | | high |
| #Q032 | administrative | operational | mandatory | Measurable Goals Requirement | other | Provide measurable goals in your SWMP so you can evaluate the program’s effectiveness and make adjustments as necessary. | | high |
| #Q033 | reporting | reporting | mandatory | Program Progress Reporting | other | As part of the program, compile a report on program progress that includes things like the status of compliance with permit conditions, results of any information collected and analyzed, summaries of planned stormwater activities, and any changes that have been made. | | high |
| #Q034 | monitoring | operational | mandatory | TMDL and Impaired Water Identification | other | Know whether your storm drain system discharges to an impaired water body or a water body with an approved Total Maximum Daily Load (TMDL). | | high |
| #Q035 | administrative | operational | mandatory | TMDL Addressing Process | other | Include a process in your SWMP for addressing the TMDL if necessary. | if the system discharges to an impaired water body or a water body with an approved TMDL | high |
| #Q036 | administrative | reporting | mandatory | Great Lakes CSO Public Notification | wastewater, aquatic life | The requirements address signage, initial notification of local public health departments and other potentially affected entities, initial notification of the public, annual notice provisions, and development of a public notification plan. | combined sewer discharges (CSOs) to the Great Lakes | high |
| #Q037 | reporting | reporting | mandatory | Electronic Reporting Requirement | wastewater, other | It requires permittees and regulators to use existing, available information technology to electronically report information and data related to the NPDES permit program in lieu of filing paper-based reports. | | high |
| #Q038 | monitoring | operational | mandatory | Sufficiently Sensitive Test Methods | wastewater | only "sufficiently sensitive" analytical test methods may can be used when completing an NPDES permit application and when performing sampling and analysis pursuant to monitoring requirements in an NPDES permit. | when completing an NPDES permit application and when performing sampling and analysis pursuant to monitoring requirements | high |
| #Q039 | treatment | operational | mandatory | Cooling Water Intake Mortality Reduction Options | aquatic life | The facilities are required to choose one of seven options to reduce mortality to fish and other aquatic organisms. | existing facilities that are designed to withdraw at least 2 million gallons per day of cooling water | high |
| #Q040 | monitoring | operational | mandatory | Cooling Water Intake Site-Specific Control Studies | aquatic life | Facilities that withdraw at least 125 million gallons per day must conduct studies to help their permitting authority determine whether and what site-specific controls, if any, would be required to further reduce mortality of aquatic organisms. | Facilities that withdraw at least 125 million gallons per day | high |
| #Q041 | treatment | operational | mandatory | Cooling Water Intake Mortality Reduction for New Units | aquatic life | New units added to an existing facility are required to reduce mortality of aquatic organisms that achieves one of two alternatives under national entrainment standards. | New units added to an existing facility | high |