V.A.1.

APCD General Permit GP06

GENERAL CONSTRUCTION PERMIT — Diesel Fuel – Fired Reciprocating Internal Combustion Engines (RICE) — GP06 Issuance 4, July 23, 2025

This general construction permit (GP06, Issuance 4, dated July 23, 2025) covers diesel-fueled reciprocating internal combustion engines (RICE). The permit sets out general permit applicability, emission limits, state and federal regulatory requirements, recordkeeping, reporting, testing, operating and maintenance requirements, monitoring requirements for facilities in Disproportionately Impacted Communities, registration approval procedures, general terms and conditions, and alternative operating scenarios for engines.

I.A.

GP06 can be used only for a diesel-fired RICE that is a stationary source, including portable units, that meets the requirements listed in I.A.1 through I.A.4.

The engine must be a true or synthetic minor for Operating Permits, PSD and NSR (except as I.A.5 and I.A.6 provide); a true or synthetic minor under 40 CFR Part 63 (NESHAP); compliant with all applicable NSPS Subpart IIII requirements including the relocation standards in Regulation Number 6, Part B, Section I.C; and compliant with all conditions in Section II.A of GP06.

I.A.1.

The permit applies only to a diesel-fired RICE that qualifies as a true minor or synthetic minor source for Operating Permits, PSD, and NSR purposes, except as spelled out in conditions I.A.5. and I.A.6.

I.A.2.

The permit covers only engines that qualify as true minor sources or synthetic minor sources under the federal hazardous air pollutant (HAP) rules in 40 CFR Part 63. If your engine is a major source of HAPs, you cannot use GP06.

I.A.3.

The permit covers only diesel engines that comply with all applicable NSPS Subpart IIII requirements, including the standards in Regulation Number 6, Part B, Section I.C. for engines relocating into Colorado.