Injection of Carbon Dioxide: Subpart UU SEPA

		United States

Environmental Protection
Agency

Greenhouse Gas Reporting Program

Under subpart UU of the Greenhouse Gas (GHG) Reporting Program, facilities that inject carbon
dioxide (C02) underground for enhanced oil and gas recovery or any other purpose must report basic
information on the amount of C02 that is received for underground injection.

How Is This Source Category Defined?

The subpart UU source category comprises a well or group of wells that inject C02 into the subsurface,
including Underground Injection Control (UIC) Class II wells used to enhance oil and gas recovery and
wells receiving a geologic sequestration research and development (R&D) exemption from subpart RR.

Facilities that report under subpart RR for a well or group of wells are not required to report under subpart
UU for that well or group of wells.

What GHGs Must Be Reported?

All facilities that inject C02 underground must report basic information on the amount of C02 received
for injection.

When Does Reporting Begin?

Facilities subject to subpart UU must begin monitoring GHG emissions on January 1, 2011 in
accordance with the methods specified in subpart UU. For 2012 only, the GHG report must be
submitted to EPA by September 28, 2012. This reporting deadline applies to all subparts being
reported by the facility. If your subpart UU facility submitted a GHG annual report for reporting
year 2010 under another subpart (e.g., subpart C for general stationary fuel combustion), then by
April 2, 2012 you must notify EPA through e-GGRT that you are not required to submit the
second annual report until September 28, 2012 (the notification deadline according to 4 CFR
98.3(b) is March 31, 2012, however, because this date falls on a Saturday in 2012, the
notification is due on the next business day).

Starting in 2013 and each year thereafter, reports must be submitted to EPA by March 31 of each
year, unless the 31st is a Saturday, Sunday, or federal holiday, in which case the reports are due
on the next business day.

What I nformation Must Be Reported?

All facilities that inject C02 underground must report the following annually:

• The mass of C02 received for injection for the first time into a well at the facility.

The source of the C02 received, from the following categories: C02 production wells; electric
generating units; ethanol plants; pulp and paper mills; natural gas processing; gasification

November 2011

1

-------
operations; other anthropogenic sources; C02 received from a discontinued enhanced oil and gas
recovery project; or unknown.

How Should GHG Data Be Calculated?

All facilities that inject C02 underground must calculate the mass of C02 received using mass or
volumetric flow meters (or the mass or volume of containers), based on the C02 concentration in the
flow. Reporters may use best available monitoring methods (BAMM) for calculating the mass of C02
received through the first quarter of 2011 or up to the end of 2011 if a BAMM extension is approved by
EPA.

Where flow meters are used to calculate data, C02 flow and concentration data must be collected
quarterly and aggregated to an annual quantity. To minimize the purchase and installation of new
equipment, facilities subject to the UIC program may utilize the C02 flow meters installed for purposes
of compliance with their existing UIC permits in order to calculate the C02 flow data. For facilities
receiving C02 in containers, the mass or volume of contents in containers and concentration data must be
collected quarterly and aggregated to an annual quantity.

For More Information

This document is provided solely for informational purposes. It does not provide legal advice, have
legally binding effect, or expressly or implicitly create, expand, or limit any legal rights, obligations,
responsibilities, expectations, or benefits in regard to any person. The document is intended to assist
reporting facilities/owners in understanding key provisions of the rule. It is not intended to be a substitute
for the rule.

For technical information and implementation materials, please visit EPA's Web site at:
www.epa.gov/climatechange/emissions/ghgrulemaking.html. To submit a question, select Rule Help
Center, and then select Contact Us.

For background information about GHGs and climate change science and policy, please see EPA's
climate change Web site at: www.epa.gov/climatechange.

November 2011

2

-------