On June 17, 1999, EPA issued the national emission standards for hazardous air pollutants (NESHAP) from Oil and Natural Gas Production Facilities and the national emission standards for hazardous air pollutants from Natural Gas Transmission and Storage Facilities (Oil and Gas NESHAP) (64 FR 32610). The Oil and Gas NESHAP require new and existing major sources to control emissions of hazardous air pollutants (HAP) to the level reflecting application of the maximum achievable control technology (MACT). On June 28, 2001, EPA issued technical corrections that clarify intent and correct errors in the Oil and Gas NESHAP. These corrections become effective June 29, 2001. These editorial, cross-referencing and clarifying corrections are minor in nature and are noncontroversial. However, they do contain clarifications of jurisdiction that could be important to the gas transmission industry. The corrections document is available on the Technology Transfer Network (TTN) at http://www.epa.gov/ttn/oarpg.