Apache Corporation violated the Clean Air Act, the New Mexico Air Quality Control Act, their implementing regulations, and the Texas State Implementation Plan at 23 oil and natural gas production facilities in New Mexico and Texas by failing to comply with requirements of the Federal New Source Performance Standards set forth at 40 CFR part 60, subpart OOOO and OOOOa, and failing to operate its facilities in accordance with applicable permits, namely, the New Mexico General Construction Permit for Oil and Gas Facilities and the Texas Commission on Environmental Quality Permit by Rule and Standard Permit. Under the proposed settlement, Defendant agrees to pay a civil penalty of $4,000,000 and to perform a project that will offset the excess emissions resulting from the violations. In addition, the settlement requires the Defendant to ensure ongoing compliance with all applicable regulatory requirements at 422 of its oil and natural gas production facilities in New Mexico and Texas. Specifically, the settlement requires the Defendant to undertake a field survey to identify and remedy any compromised equipment, to undertake a design analysis to ensure adequate design and sizing of the vapor control system, to install and operate extensive monitoring systems, to implement a robust inspection and maintenance program, and to hire an independent third party to verify compliance.