These state rules apply to oil and gas production facilities and compressor stations located in a part of Wyoming that has experienced poor air quality (the Green River Basin). Facility-specific permit limits that meet or exceed these standards may override these rules.
This regulation sets the following requirements:
• If flashing emissions from storage tanks or vessels at a production facility equal or exceed 4 tons of volatile organic compounds (VOCs) per year, they must be controlled with equipment that can destroy at least 98% of the VOCs by January 1, 2017. Storage tanks that are on site for use during emergency or upset conditions are not subject to these control requirements. Nonetheless, all emergency, open-top, and/or blowdown tanks shall install a liquid level gauge and estimate flashing emissions.
• If dehydrator emissions equal or exceed 4 tons VOC per year, they must also be controlled to destroy at least 98% of the VOCs and equipped with reboiler still vent condensers by January 1, 2017.
• VOC emissions from gas-operated pneumatic pumps must be controlled at a 98% efficiency rate by January 1, 2017.
• VOC emissions from gas-operated pneumatic controllers exceeding 6 standard cubic feet per hour must be captured and routed into a sales line, collection line, fuel supply line, or other closed loop system by January 1, 2017.
• Where production facilities or compressor stations emit more than 4 tons VOC per year, the operator shall develop a Leak Detection and Repair (LDAR) Protocol by January 1, 2017. LDAR must take place at least quarterly, include a leak repair schedule, and use a combination of EPA Method 21, an optical gas imaging instrument, other instrument-based technologies or audio-visual-olfactory inspections.
The rules explain how to calculate annual emissions to determine if pollution control requirements are triggered.
Moreover, this regulation outlines that VOC combustion devices must be continually monitored to ensure at least a 98% destruction rate. In addition, quarterly inspections of monitoring and destruction/control equipment are required.
Quarterly reporting is required beginning January 1, 2016 and records must be kept for 5 years.