1. (1) Regardless of construction, reconstruction, or modification date, each stationary engine at a well site shall comply with the emission standards listed in Table 1 when the engine is installed, relocated, or modified.

   Table 1

   Maximum Engine hp Emission Standards in (g/hp-hr)

   NOx CO VOC HC+NOx

   Equal or greater than - 4.85 - 2.83

   25 hp and < 100 hp

   Equal or greater than 1.0 2.0 0.7 -

   100 hp

2. (2) The owner or operator shall either:

   1. (a) purchase a certified stationary internal combustion engine as defined in 40 CFR 60.4248, or
   2. (b) conduct an initial performance test according to 40 CFR 60.4244.

3. (3) Each engine shall vent exhaust gases vertically unrestricted with the following stack height requirements:

   1. (a) For site hp ratings of 306 or greater, each engine shall have an attached stack height of no less than 10 feet.
   2. (b) For site hp ratings of 151 to 305 hp, each engine shall have an attached stack height of no less than 8 feet.
   3. (c) For site hp ratings of 150 hp or less, there are no stack height requirements on engines.

KEY: air pollution, oil, gas

Date of Last Change: March 5, 2018

Notice of Continuation: February 1, 2023

Authorizing, and Implemented or Interpreted Law: 19-2-104(1)(a)