Utah Admin. Code 307-509-2
"Difficult-to-Monitor" means difficult-to-monitor as defined 40 CFR 60.5397a, which is incorporated by reference in Rule R307-210.
"Fugitive emissions" are considered any visible emissions observed using optical gas imaging or a Method 21 instrument reading of 500 ppm or greater.
"Fugitive emissions component" means any component that has the potential to emit fugitive emissions of VOC, including valves, connectors, pressure relief devices, open-ended lines, flanges, covers and closed vent systems, thief hatches or other openings, compressors, instruments, and meters.
"Shut-in or temporarily abandoned" means a well that is closed off such that it stops producing for longer than seven calendar days.
"Unsafe-to-Monitor" means unsafe-to-monitor as defined 40 CFR 60.5397a, which is incorporated by reference in Rule R307-210.
Utah Admin. Code R307-509-2