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The Texas Commission on Environmental Quality (TCEQ) Non-Rule Barnett Shale Standard Permit (6002 Non-Rule) has specific Best Available Control Technology (BACT) requirements included for stationary internal combustion engines (ICE) within Table 6 in section (m), titled Engine and Turbine Emission and Operational Standards. Sites authorized under the Non-Rule Barnett Shale Standard Permit are required to meet the BACT limits for Table 6 based on the engine type, size, and manufacturer date. Please be aware that new rich burn non-emergency, spark-ignited engines that are placed at a site or existing rich burn non-emergency, spark-ignited engines that are modified after January 1, 2015 will need to meet a reduced NOX emission factor of 0.5 g/hp-hr. There are a few exceptions to this rule based on the hp of the engine. Additional clarification for the compliance dates for the lowered BACT limits are provided in the table below.

Table 1. Rich Burn Non-emergency Spark-ignited Engines
Engine Authorization DateNOX BACT Compliance Date (0.5 g/hp-hr)
No changes to existing engines. Engines are located and authorized at the site prior to January 1, 2015.Comply with 0.5 g/hp-hr BACT requirement upon renewal AFTER December 2015. If the renewal date occurs prior to December 2015, the site will have another 10 years to come into compliance. For example, if no changes are made to the site and the renewal occurs in August 2015, the site will have until August 2025 to come into compliance unless a modification is made at the site.
Modification to engine occurs after 1/1/2015 but before renewal date1 year after permit issuance for the modification
Modification or addition of engine occurs before 1/1/2015If the authorization is issued BEFORE 1/1/2015, the site should comply with appropriate BACT as listed in Table 6 (e.g. 2 g/hp-hr). If the authorization is issued AFTER 1/1/2015, the site will have one year after permit issuance to come into compliance with 0.5 g/hp-hr emission factor
New engine installed after 1/1/2015Time of authorization

 

Table 2. 4 Stroke Lean Burn Non-emergency Spark-ignited Engines
Engine Authorization DateNOX BACT Compliance Date (2.0 g/hp-hr)
Engines manufactured on or after July 1, 2010 regardless of authorization dateMUST meet the more stringent limit of 1 g/hp-hr
Before or on 1/1/20121/1/2020
After 1/1/2012, before 1/1/20151/1/2015
After 1/1/20153 years after permit issuance

 

In order to meet BACT requirements, it may be necessary to install controls on or before the corresponding compliance dates. Notification or registration with the TCEQ may be required for these changes. A different set of dates and emission limits are provided for sites authorized under the Barnett Shale Permit By Rule (PBR) and this clarification does not apply to these facilities.