Technology Transfer Network
Emission Measurement Center
Performance Specifications and Other Monitoring Information
This page includes information related to Performance Specifications and other monitoring information.
This other monitoring information includes:
Performance specifications are used for evaluating the acceptability
of the CEMS at the time of or soon after installation and whenever
specified in the regulations. Quality assurance procedures in 40 CFR
Part 60 Appendix F are used to evaluate the effectiveness of quality
control (QC) and quality assurance (QA) procedures and the quality
of data produced by any CEMS that is used for determining compliance
with the emission standards on a continuous basis as specified in
the applicable regulation.
Performance Specifications are divided into Promulgated Performance Specifications and Proposed Performance Specifications.
Other Monitoring Information
Continuous Emission Monitoring
A continuous emission monitoring system (CEMS) is the total equipment
necessary for the determination of a gas or particulate matter concentration
or emission rate using pollutant analyzer measurements and a conversion
equation, graph, or computer program to produce results in units of
the applicable emission limitation or standard. CEMS are required
under some of the EPA regulations for either continual compliance
determination or determination of exceedances of the standards. The
individual subparts of the EPA rules specify the reference methods
that are used to substantiate the accuracy and precision of the CEMS.
A predictive emission monitoring system (PEMS) is the total equipment
necessary for the determination of a gas concentration or emission
rate using processor control device operating parameter measurements
and a conversion equation, a graph, or computer program to produce
results in units of the applicable emission limitation or standard.
A performance specification for PEMS, Performance
Specification 16, was finalized in March of 2009.
Compliance Assurance Monitoring
The Compliance Assurance Monitoring, or CAM, rule is designed
to satisfy the requirements for monitoring and compliance certification
in the Part 70 operating permits program and Title VII of the 1990
Clean Air Act Amendments. The CAM rule includes a new Part 64 and
associated revisions to the Part 70 (permits program) monitoring and
compliance certification requirements. The rule would establish criteria
that define the monitoring, reporting, and record keeping that should
be conducted by a source to provide a reasonable assurance of compliance
with emission limitations and standards. These criteria address defining
the applicable monitoring approach, obligation to complete corrective
actions as indicated by the monitoring results, and how such data
are used in the annual compliance certification. The applicable monitoring
approach for any operation or facility depends on the control technology
used to meet the applicable emission limit and includes monitoring
of operational and control device parameters indicative of pollution
control performance and record keeping of work practice and inspection
procedures necessary to assure compliance operation. The final CAM
Rule was published in the Federal Register on October 22, 1997.
Voluntary Superior Monitoring
The Emissions Measurement Center of EPA's Office of Air Quality
Planning and Standards in Research Triangle Park, NC is exploring a
regulatory option called "Voluntary Superior Monitoring (VSM)."
Under this option, owners/operators of industrial air pollution
sources could volunteer to conduct "superior" monitoring which
could range from more frequent monitoring of emissions to replace
existing monitoring. In return for conducting superior monitoring,
EPA plans to offer incentives to these sources, such as less record
keeping and reporting, more flexibility in control device or process
operation, or flexibility in averaging times for determining
compliance with the standard. We are also considering pursuing
tax credits as an incentive; however, obtaining tax credits as an
incentives will present some higher than normal hurdles and will
result in EPA negotiating with agencies and groups beyond their
normal purview. In conjunction with the rulemaking, we plan to
provide guidance on how to implement Voluntary Superior Monitoring
which will contain the detailed criteria that industrial sources
would need to meet to be eligible for this program. We are still
in the data gathering stage and are seeking ideas concerning this
project, especially ideas concerning incentives and eligibility
In order to implement this program, we will need to conduct rulemaking. Revising all of the individual New Source Performance Standards (NSPS) and National Emission Standards for Hazardous Air Pollutants (NESHAP) to allow VSM would be daunting. Instead, we envision implementing this regulatory option by revising the general provisions to parts 60, 61, and 63. The general provisions contain the general monitoring, testing, recordkeeping, reporting, and other requirements common to all NSPS and/or NESHAP. In addition, we believe that this progrmam will also need to be implemented through the operating permit program in parts 70 and 71 which may need to be modified to allow this approach.
Voluntary Superior Monitoring Documents.
Metals and Mercury Emissions Monitoring
Metals Monitoring: In 1996 Performance
Specification 10 was proposed in conjunction with the original Hazardous
Waste Combustor NESHAP, but because the measurement technology
had not been fully developed and demonstrated, the specification was
not promulgated. More recently, EPA has evaluated, at several facilities, a commercial
version of an x-ray fluorescence metals CEMS capable of measuring most of the MACT
hazardous metals in nearly real time (the instrument was built by a small business instrument developer,
Cooper Environmental). Eli Lilly Company received approval from the EPA to use this
instrument as a CEMS as an alternative in lieu of parameter monitoring on a hazardous
waste incinerator. Lilly invested in much laboratory and field work to prove to the
EPA that their CEMS is accurate, reliable, and verifiable. The US Army has successfully
installed and evaluated one of these CEMS on a hazardous waste incinerator. These
studies resulted in several monitoring methods and performance standards for the x-ray
technology. These documents may be found under the
Other Methods section of this web site.
The EMC is presently evaluating ambient fence line multimetals monitoring for compliance determination, ambient health exposure studies, and for locating and evaluating unknown sources of metals emissions. The knowledge gained from, and the success of, the Lilly study has provided support in the transition to a study of the fence line monitoring platform of this x-ray fluorescence technology. A stakeholder group has been formed to provide feedback to EMC on the project. A validation field study is underway in Missouri to compare the fence line monitor to existing PM-10 ambient monitors.
Mercury Monitoring: Like Performance Specification 10, Performance Specification 12 for mercury (Hg) CEMS was also proposed in conjunction with the original Hazardous Waste Combustor NESHAP, but because the measurement technology was not fully developed nor demonstrated at that time, it was never promulgated. Between 2003 and 2005, Performance Specification 12A for Hg CEMS was proposed and promulgated in conjunction with the Clean Air Mercury Rule (CAMR) after extensive demonstration of Hg CEMS and identification of appropriate performance parameters. In 2007, CAMR was vacated by the DC Circuit Court, which called into question the legality of using Performance Specification 12A. It has since been re-proposed in conjunction with amendments to the Portland Cement NESHAP.
In order to obtain high quality mercury monitoring data, it is necessary to have Hg calibration gas standards of known concentration and known uncertainty. EPA's Clean Air Markets Division, working with EPA's Office of Research and Development and EMC, have recently completed two interim EPA traceability protocols to establish procedures for the qualification and certification of elemental and oxidized Hg gas generators.