Site remediation mact summary

4. What are the emission and work practice standards for affected sources under this rule?

For affected sources, the emission and work practice standards are the same for existing, reconstructed and new sources.

Process Vents

The first option to meet the emission standards is to reduce emissions of total organic HAP emissions from all affected process vents at the facility to a level less than 1.4 kilograms per hour (kg/hr) and 2.8 milligrams per year (Mg/yr), which is approximately 3.0 pounds per hour (lb/hr) or 3.1 tons per year (tpy). The facility must also achieve both hourly and annual mass emissions limits

As an alternative, the facility may comply with the emission limit that requires the facility to reduce the total organic HAP emissions listed in Table 1 of the final rule from all of the affected process vents by at least 95% weight.

Remediation Material Management Units

Tanks – For those tanks managing remediation materials with a maximum HAP vapor pressure of the remediation material less than 76.6 kPa and required to meet the air emission control requirements, the facility must achieve the applicable level of control (Tank Level 1 or 2) determined by the tank design capacity and the maximum HAP vapor pressure of the remediation material placed in the tank.

Containers – If the facility controls organic HAP emissions from containers having a design capacity greater than 0.1 cubic meters (approx. 26 gallons), the facility must achieve the applicable level of control determined by the container design capacity, the organic content of the remediation material in the container, and whether the container is used for a waste stabilization process

Surface Impoundments – For each surface impoundment required to use air pollution controls, the facility is required to use a floating membrane cover or a cover vented to a control device according to the requirements in 40 CFR part 63, subpart QQ.

Separators – For each oil-water or organic-water separator required to use air pollution controls, the facility must use a fixed roof, use a floating roof, vent emissions to a control device, or use a pressurized separator according to the requirements in 40 CFR part 63, subpart VV.

Transfer Systems – For an affected transfer system other than individual drain systems, the facility is required to comply with one of three options: use covers, use continuous hard-piping, or use an enclosure vented to a control device.

Closed Vent Systems and Control Devices – For each control device that is used to meet the requirements under the final Site Remediation NESHAP must reduce emissions of total organic HAP listed in Table 1 of the final rule or the emissions of total organic carbons (TOC) by 95% weight. If a combustion control device is used a second compliance option available is for the control device to reduce the concentration of total HAP listed in Table 1 of the final rule or TOC to 20 parts per million volume (ppmv) or less on a dry basis corrected to 3% oxygen. All control devices used to meet the requirements of the final rule must meet the operating limits for each type of control device and work practice standards for closed vent systems and certain types of control devices.

Equipment Leaks

Work practice standards have been established to control organic HAP emissions from leaks in pumps, compressors, pressure relief devices, sampling connection systems, open-ended valves or lines, valves, flanges and other connections, and product accumulator vessels that either contain or contact a regulated material that is a fluid and has a total concentration of the organic HAP listed in Table 1 of the final rule equal to or greater than 10% by weight. The work practice  standards do not apply to equipment that operates less than 300 hours per calendar year.

Facilities have a choice of two options to comply with, and both require implementation of a leak detection and repair (LDAR) program and certain equipment modifications.