Memos
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This is a list of natural gas-fired turbine projects authorized by TCEQ that generate 20 megawatts (MW) or more greater electric output. It shows their permit numbers, turbine models, number of turbines, power output per turbine and site wide in MW, emissions controls, mode of operation (simple cycle [SC], combined cycle [CC], or cogeneration), and BACT emission concentrations for NOx and CO.
TCEQ Interoffice Memo - Use of permits by rule for Proprietary On-Site Sewage Facility (OSSF) treatment systems authorized under 30 TAC Chapter 285 - June, 2025
This document is part of the NSR Policy and Guidance Database
TCEQ - NSPS OOOO-series-implementation-guidance-memo
EPA - Merps Data Distribution and Errata Memo 02-23-2017
From EPA: Clarification on the Use of AERMOD Dispersion Modeling for Demonstrating Compliance with the NO2 National Ambient Air Quality Standard
EPA Interim 1-Hour SO2 Screening Background Concentrations - For use in PBR / standard permit demonstrations, as applicable
This document is a technical justification for screening background concentrations for SO2
This document may be of assistance in applying the New Source Review (NSR) air permitting regulations including the Prevention of Significant Deterioration (PSD) requirements. This document is part of the NSR Policy & Guidance Database.
Interim 1-Hour NO2 Screening Background Concentrations in micrograms per cubic meter
The purpose of this memo is to describe the process to be used in the determination of GACT as it relates to the issuance of a Voluntary Emission Reduction Permit (VERP) in nonattainment and near nonattainment areas of the state and outline factors that should be considered.
This memo is to address a change in Air Permits Division policy to specifically identify allowable limits for highly-reactive volatile organic compound (HRVOC) emissions within the maximum allowable emission rate table (MAERT) for all permits issued to sites located in the Houston/Galveston/Brazoria (HGB) nonattainment area.
This letter addresses a growing concern at the Texas Natural Resource Conservation Commission (TNRCC) regarding air permitting and the State Implementation Plan (SIP). The TNRCC is developing a SIP for the Houston/Galveston nonattainment area and has proposed rules to implement controls on nitrogen oxides (NOx ) and volatile organic compounds (VOC) to achieve compliance with the National Ambient Air Quality Standard for ozone.
A number of regulation changes are expected this year driven by the State Implementation Plan (SIP) to achieve attainment status for our ozone nonattainment areas. This has prompted questions regarding the impact these changes might have on New Source Review permitting.
Guidance for Slaughterhouse Processing Plants with Pathological Waste Incinerators Permits by Rule under 30 Texas Administrative Code §§ 106.241 and 106.494
Q/A regarding compliance with 40 CFR Part 63 Subpart MMMM
The EPA develops environmental rules that apply to various types of industries, and one particular rule affects surface coaters of metal parts. This rule is found in the Code of Federal Regulations, under 40 CFR Part 63 Subpart MMMM - National Emission Standards for Hazardous Air Pollutants: Surface Coating of Miscellaneous Metal Parts and Products.
This memorandum revises the January 19, 2006 memorandum, same subject, and supersedes all previous memos. It is intended to clarify the authorization mechanism for some engines or turbines used for electric generation under permit by rule (PBR) §106.512.
Authorization Options for Required Diesel Additives