(From Gary Rubenstein, 11/1/99)
Achieved in Practice Criteria
A control technology or emission unit will be considered as achieved in practice if it meets all of the following criteria.
Commercial Availability: At least one vendor must offer this equipment for regular or full-scale operation in the United States for the type of basic equipment or process under review.
Reliability: All control technologies must have been installed and operated
continuously for at least six months, and operated at a minimum of 50% design capacity. If
the operator did not require the basic equipment to operate continuously, such as only
eight hours per day and 5 days per week, then the control technology must have operated
whenever the basic equipment was in operation during the six months
All control technologies must complete a demonstration period during which:
1) The control technology has been installed and operated reliably for at least six calendar months; and
2) The control technology has been operated: a) for at least 4380 hours within 36 consecutive calendar months, for basic equipment that involves the combustion of fuel, or b) for at least 520 hours within 36 consecutive calendar months, for basic equipment that does not involve the combustion of fuel; and
3) The control technology has operated during at least 99% of the hours that the basic equipment has been operated; and
4) The control technology has not resulted in downtime for the basic equipment in excess of 2% of the number of hours that the basic equipment operated during the demonstration period.
There must be sufficient operating data available to enable the District to evaluate the control technology in relation to these criteria.
Effectiveness: The control technology must be verified to perform
effectively while operating under a load that is equivalent to the potential to emit (PTE)
of the basic equipment or 90% of its design specification, if possible. The verification
shall be based on a performance test, when possible, or other performance data.
The control technology must be verified to perform effectively while operating in a manner typical for the basic equipment for which the control technology is being considered. Effectiveness shall be demonstrated in the following manner:
1) If the control technology is implemented at a source where continuous emissions monitoring is required for the pollutant being controlled, 99% of the valid, monitored values must be less than or equal to the applicable permit limit, excluding values associated with allowable equipment startups, shutdowns, and breakdowns. Breakdowns can be excluded from this calculation only to the extent that the breakdowns were reported to the District in accordance with the provisions of Rule 430 (if the source is located within the District), and the breakdowns are not part of a recurring pattern indicative of inadequate design, operation or maintenance.
2) For all control technologies, source performance tests performed at the beginning and end of the demonstration period indicate that the control technology is achieving the level of emission control proposed for the control technology. Where the basic equipment typically operates at various loads or production rates, the source performance tests shall be performed at a typical minimum load or production rate, and at a typical maximum load or production rate. If, in the District’s judgment, the type of control technology or basic equipment is not amenable to source performance testing, the District shall evaluate engineering and performance data collected at the beginning and end of the demonstration period to determine whether the level of emission control proposed for the control technology is being achieved.