Performance Specification 18-Specifications and Test Procedures for Gaseous HCl Continuous Emission Monitoring Systems at Stationary Sources, 27689-27716 [2014-10824]
Agencies
[Federal Register Volume 79, Number 93 (Wednesday, May 14, 2014)] [Proposed Rules] [Pages 27689-27716] From the Federal Register Online via the Government Printing Office [www.gpo.gov] [FR Doc No: 2014-10824] [[Page 27689]] Vol. 79 Wednesday, No. 93 May 14, 2014 Part II Environmental Protection Agency ----------------------------------------------------------------------- 40 CFR Part 60 Performance Specification 18--Specifications and Test Procedures for Gaseous HCl Continuous Emission Monitoring Systems at Stationary Sources; Proposed Rule Federal Register / Vol. 79 , No. 93 / Wednesday, May 14, 2014 / Proposed Rules [[Page 27690]] ----------------------------------------------------------------------- ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 60 [EPA-HQ-OAR-2013-0696; FRL-9909-79-OAR] RIN 2060-5689 Performance Specification 18--Specifications and Test Procedures for Gaseous HCl Continuous Emission Monitoring Systems at Stationary Sources AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. ----------------------------------------------------------------------- SUMMARY: The Environmental Protection Agency (EPA) is proposing performance specifications and test procedures for hydrogen chloride continuous emission monitoring systems to provide sources and regulatory agencies with criteria and test procedures for evaluating the acceptability of hydrogen chloride continuous emission monitoring systems. The proposed specification (Performance Specification 18) includes requirements for initial acceptance including instrument accuracy and stability assessments. This action also proposes quality assurance procedures for hydrogen chloride continuous emission monitoring systems used for compliance determination at stationary sources. The quality assurance procedures (Procedure 6) specify the minimum quality assurance requirements necessary for the control and assessment of the quality of continuous emission monitoring systems data submitted to the EPA. This action would establish consistent requirements for ensuring and assessing the quality of data measured by hydrogen chloride continuous emission monitoring systems. The affected systems are those used for determining compliance with emission standards for hydrogen chloride on a continuous basis as specified in an applicable permit or regulation. The affected industries and their North American Industry Classification System codes are listed in the SUPPLEMENTARY INFORMATION section of this preamble. DATES: Comments. Comments must be received on or before June 13, 2014. Public Hearing. The EPA will hold a public hearing on this rule if requested. Requests for a hearing must be made by May 27, 2014. Requests for a hearing should be made to Ms. Candace Sorrell via email at sorrell.candace@epa.gov or by phone at (919) 541-1064. If a hearing is requested, it will be held on May 28, 2014 at the EPA facility in Research Triangle Park, NC. ADDRESSES: Comments. Submit your comments, identified by Docket ID No. EPA-HQ-OAR-2013-0696, by one of the following methods:https://www.regulations.gov: Follow the online instructions for submitting comments. Email: a-and-r-docket@epa.gov, Attention Docket ID Number EPA-HQ-OAR-2013-0696. Fax: (202) 566-9744, Attention Docket ID No. EPA-HQ-OAR- 2013-0696. Mail: U.S. Postal Service, send comments to: EPA Docket Center, William J. Clinton (WJC) West Building, Attention Docket ID Number EPA-HQ-OAR-2013-0696, U.S. Environmental Protection Agency, Mail code: 28221T, 1200 Pennsylvania Ave. NW., Washington, DC 20460. Please include a total of two copies. Hand Delivery: U.S. Environmental Protection Agency, WJC West Building (Air Docket), Room 3334, 1301 Constitution Ave. NW., Washington, DC, 20004, Attention Docket ID Number EPA-HQ-OAR-2013-0696. Such deliveries are only accepted during the Docket's normal hours of operation, and special arrangements should be made for deliveries of boxed information. Instructions. Direct your comments to Docket ID Number EPA-HQ-OAR- 2013-0696. The EPA's policy is that all comments received will be included in the public docket without change and may be made available online at https://www.regulations.gov, including any personal information provided, unless the comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through https://www.regulations.gov or email. The https://www.regulations.gov Web site is an ``anonymous access'' system, which means the EPA will not know your identity or contact information unless you provide it in the body of your comment. If you send an email comment directly to the EPA without going through https://www.regulations.gov, your email address will be automatically captured and included as part of the comment that is placed in the public docket and made available on the Internet. If you submit an electronic comment, the EPA recommends that you include your name and other contact information in the body of your comment and with any disk or CD-ROM you submit. If the EPA cannot read your comment due to technical difficulties and cannot contact you for clarification, the EPA may not be able to consider your comment. Electronic files should not include special characters or any form of encryption and be free of any defects or viruses. For additional information about the EPA's public docket, visit the EPA Docket Center homepage at: https://www.epa.gov/epahome/dockets. Docket: The EPA has established a docket for this rulemaking under Docket ID Number EPA-HQ-OAR-2013-0696. All documents in the docket are listed in the regulations.gov index. Although listed in the index, some information is not publicly available, e.g., CBI or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the Internet and will be publicly available only in hard copy. Publicly available docket materials are available either electronically in regulations.gov or in hard copy at the EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution Ave. NW., Washington, DC 20004. The Public Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through Friday, excluding legal holidays. The telephone number for the Public Reading Room is (202) 566-1744, and the telephone number for the EPA Docket Center is (202) 566-1742. FOR FURTHER INFORMATION CONTACT: For questions about this proposed action, contact Ms. Candace Sorrell, Office of Air Quality Planning and Standards, Air Quality Assessment Division (AQAD), Measurement Technology Group, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27709; telephone number: (919) 541-1064; fax number: (919) 541-0516; email address: sorrell.candace@epa.gov. SUPPLEMENTARY INFORMATION: Organization of this Document. The information in this preamble is organized as follows: I. General Information A. Does this action apply to me? B. Where can I get a copy of this document and other related information? C. What should I consider as I prepare my comments for the EPA? II. Background III. Summary of Proposed Performance Specification 18 A. What is the purpose of PS-18? B. Who must comply with PS-18? C. When must I comply with PS-18? D. What are the basic requirements of PS-18? E. What are the reporting and recordkeeping requirements for PS- 18? IV. Summary of Proposed Procedure 6 A. What is the purpose of Procedure 6? B. Who must comply with Procedure 6? C. When must I comply with Procedure 6? D. What are the basic requirements of Procedure 6? [[Page 27691]] E. What are the reporting and recordkeeping requirements for Procedure 6? V. Rationale for Selecting the Proposed Requirements of Performance Specification 18 and Procedure 6 A. What information did we use to develop PS-18 and Procedure 6? B. How did we select the requirements for PS-18 and Procedure 6? C. Solicitation for Comment VI. Statutory and Executive Order Reviews A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review B. Paperwork Reduction Act C. Regulatory Flexibility Act D. Unfunded Mandates Reform Act E. Executive Order 13132: Federalism F. Executive Order 13175: Consultation and Coordination With Indian Tribal Governments G. Executive Order 13045: Protection of Children From Environmental Health Risks and Safety Risks H. Executive Order 13211: Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution, or Use I. National Technology Transfer and Advancement Act J. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations I. General Information A. Does this action apply to me? The major entities that would potentially be affected by the proposed performance specification 18 (PS-18) and the quality assurance (QA) requirements of Procedure 6 for gaseous hydrogen chloride (HCl) continuous emission monitoring systems (CEMS) are those entities that are required to install a new CEMS, relocate an existing CEMS, or replace an existing CEMS under any applicable subpart of 40 CFR parts 60, 61 or 63. Table 1 of this preamble lists the current federal rules by subpart and the corresponding source categories to which the proposed PS-18 and Procedure 6 potentially would apply. Table 1--Source Categories That Would Be Subject to PS-18 and Procedure 6 ------------------------------------------------------------------------ Subpart(s) Source category ------------------------------------------------------------------------ 40 CFR part 60 ------------------------------------------------------------------------ Subpart F......................... Portland Cement Plants. Subpart Da........................ Fossil Fuel-Fired Electric Utility, Industrial-Commercial- Institutional, and Small Industrial- Commercial-Institutional Steam Generating Units. ------------------------------------------------------------------------ 40 CFR part 63 ------------------------------------------------------------------------ Subpart LLL....................... Portland Cement Manufacturing Industry. Subpart UUUUU..................... Coal- and Oil-fired Electric Utility Steam Generating Units. ------------------------------------------------------------------------ The requirements of the proposed PS-18 and Procedure 6 may also apply to stationary sources located in a state, district, reservation or territory that adopts PS-18 or Procedure 6 in its implementation plan. Should PS-18 and Procedure 6 ultimately be finalized, we plan to amend 40 CFR part 63 subpart UUUUU, National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-fired Electric Utility Steam Generating Units to offer PS-18 and Procedure 6 as an alternative to PS-15 for continuous monitoring of HCl. Note, however, that the alternative test method approval process of 63.7(f) is already available, even without any regulatory amendment, as a way for affected facilities to request approval to use PS-18/Procedure 6 in lieu of PS- 15. With regard to 40 CFR part 63, Subpart LLL which affects Portland cement manufacturing facilities and includes HCl monitoring requirements, should PS-18 and Procedure 6 be finalized, no amendments will be needed as Subpart LLL already allows for use of any promulgated performance specification for HCl CEMS in 40 CFR part 60, Appendix B. Table 2 lists the corresponding North American Industry Classification System (NAICS) codes for the source categories listed in Table 1 of this preamble. Table 2--NAICS for Potentially Regulated Entities ------------------------------------------------------------------------ Industry NAICS Codes ------------------------------------------------------------------------ Fossil Fuel-Fired Electric Utility Steam Generating 327310 Units............................................... \a\ 921150 Portland Cement Manufacturing Plants................. 327310 ------------------------------------------------------------------------ \a\ Industry in Indian Country. Tables 1 and 2 are not intended to be exhaustive, but rather they provide a guide for readers regarding entities potentially affected by this action. If you have any questions regarding the potential applicability of the proposed PS-18 and test procedures (Procedure 6) to a particular entity, consult the person listed in the FOR FURTHER INFORMATION CONTACT section. B. Where can I get a copy of this document and other related information? In addition to being available in the docket, an electronic copy of this action is available on the Internet through the EPA's Technology Transfer Network (TTN) Web site, a forum for information and technology exchange in various areas of air pollution control. Following signature by the EPA Administrator, the EPA will post a copy of this proposed action on the TTN's policy and guidance page for newly proposed or promulgated rules at: https://www.epa.gov/ttn/oarpg/t3pfpr.html. Following publication in the Federal Register, the EPA will post the signed proposal and key technical documents [[Page 27692]] on the project Web site: https://www.epa.gov/ttn/emc/proposed.html. C. What should I consider as I prepare my comments for the EPA? 1. Submitting CBI Do not submit information containing CBI to the EPA through https://www.regulations.gov or email. Clearly mark the part or all of the information that you claim to be CBI. For CBI information on a disk or CD-ROM that you will mail to the EPA, mark the outside of the disk or CD-ROM as CBI and then identify electronically within the disk or CD- ROM the specific information that is claimed as CBI. In addition to one complete version of the comments that includes information claimed as CBI, you must submit a copy of the comments that does not contain the information claimed as CBI for inclusion in the public docket. If you submit a CD-ROM or disk that does not contain CBI, mark the outside of the disk or CD-ROM clearly that it does not contain CBI. Information not marked as CBI will be included in the public docket and the EPA's electronic public docket without prior notice. Information marked as CBI will not be disclosed except in accordance with procedures set forth in 40 Code of Federal Regulations (CFR) part 2. Send or deliver information identified as CBI only to the following address: Roberto Morales, OAQPS Document Control Officer (C404-02), OAQPS, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, Attention Docket ID Number EPA-HQ-OAR-2013-0696. 2. Tips for Preparing Your Comments When submitting comments, remember to: Identify the rulemaking by docket number and other identifying information (subject heading, Federal Register date and page number). Follow directions. Respond to specific questions and organize comments by a section number. Explain why you agree or disagree; suggest alternatives and substitute language for your requested changes. Describe any assumptions and provide any technical information and/or data that you used. If you estimate potential costs or burdens, explain how you arrived at your estimate in sufficient detail to allow for it to be reproduced. Provide specific examples to illustrate your concerns and suggest alternatives. Explain your views as clearly as possible, avoiding the use of profanity or personal threats or character assassination. Make sure to submit your comments by the comment period deadline. II. Background The EPA recently promulgated the Portland Cement Maximum Achievable Control Technology (MACT) rule (75 FR 54970, September 9, 2010; 78 FR 10006, February 12, 2013) and the Mercury and Air Toxics Standards (MATS) rule (77 FR 9303, February 16, 2012; 78 FR 24075, April 24, 2013). Both rules specify the use of extractive Fourier Transform Infrared Spectroscopy (FTIR) and PS-15 when affected facilities opt or are required to continuously measure HCl emissions. To facilitate use of alternative technologies to FTIR and aid in measuring the low levels of HCl specified in those rules the EPA has developed and is proposing these new specifications and quality control (QC) procedures (PS-18 and Procedure 6) for HCl CEMS as an alternative to the use of PS-15. Multiple technologies are available for HCl emissions monitoring. The goals of the proposed PS-18 and Procedure 6 are (1) to allow for the use of different HCl CEMS sampling and analytical technologies as long as the required performance criteria set out in the performance specification (PS) are met; and (2) to establish consistent requirements for ensuring and assessing the quality of data measured by HCl CEMS. III. Summary of Proposed Performance Specification 18 A. What is the purpose of PS-18? Proposed PS-18 establishes the criteria to evaluate acceptable performance of HCl CEMS at the time of installation or soon after and when regulations require reevaluation of HCl CEMS performance. B. Who must comply with PS-18? You may comply with PS-18 as an alternative to other HCl CEMS performance specifications (e.g., PS-15) allowed under an applicable subpart if you use CEMS to monitor HCl emissions from controlled and uncontrolled emission sources subject to HCl CEMS requirements under a part 60, 61 or 63 regulation. C. When must I comply with PS-18? If you are the owner or operator of existing facilities required to install HCl CEMS in compliance with an associated rule, regulation or permit, you must comply with PS-18 if you choose and have these specifications approved as an alternative to other PS required under an applicable subpart [e.g., PS-15]. Equipment and supplies for HCl CEMS will vary depending on the measurement technology and equipment vendors. If you are the owner or operator of affected HCl CEMS at new stationary sources, you must comply with either the HCl CEMS PS [e.g., PS-15] required by the associated rule or permit or PS-18 as an approved alternative when you install and place into operation the affected HCl CEMS. D. What are the basic requirements of PS-18? The proposed PS-18 would require owners and operators subject to HCl CEMS requirements to: (1) Select an HCl CEMS that satisfies basic equipment control criteria; (2) install your HCl CEMS according to the manufacturer's specifications and the requirements set out in PS-18; (3) verify that the instrument is functioning properly; (4) calibrate and standardize your equipment; and (5) perform PS-18 procedures that demonstrate initial performance requirements for the HCl CEMS. A summary of the basic requirements is presented below. 1. HCl CEMS Equipment Selection As noted in section III.C, PS-18 equipment and supplies for HCl CEMS can and will vary depending on the measurement technology and equipment vendors you select. The proposed PS-18 describes the typical key equipment and supply components found in one or more types of HCl CEMS. Extractive HCl CEMS typically include a sample extraction system, sample conditioning module, HCl analyzer, diluent analyzer, system controller, data recorder, reference gas system and moisture measurement system. Hydrogen chloride integrated path-CEMS (HCl IP- CEMS) typically include source temperature and pressure monitors and an optical transmitter and receiver with or without optics to generate longer measurement paths in the emission stream. The proposed PS-18 defines the differing HCl CEMS equipment components and specifies design/operation basic criteria for the differing equipment components. For example, (1) for reference gas systems, PS-18 specifies that, for extractive CEMS, the system must be designed to be able to introduce reference gas flow sufficient to flood the sampling probe and prevent entry of gas from the effluent stream; and (2) for sample conditioning that, you must operate the module in such a way as to keep the particle-free gas sample above the modules, PS-18 [[Page 27693]] specifies dew point temperature of its components. For HCl IP-CEMS, you must operate and qualify equipment to measure source gas temperature and pressure. 2. CEMS Measurement Location Specifications and Pretest Preparation After you have selected the appropriate HCl CEMS for your operations, the proposed PS-18 requires that you install the system according to the manufacturer's specifications and as specified under section 8.0 of PS-18. The proposed PS-18 requires that you install the CEMS at an accessible location where the pollutant concentration or emission rate measurements are directly representative of the HCl emissions or can be corrected to be representative of the emissions from the affected facility. With regards to HCl CEMS emissions measurement location, the proposed PS-18 specifies that it should be (1) at least two equivalent diameters downstream of the nearest control device, point of pollution generation or other point at which a change of pollutant concentration may occur; and (2) at least half an equivalent diameter (calculated according to Method 1 in Appendix A-1 to part 60) upstream from the effluent exhaust. We are soliciting comment on alternative measurement location requirements in this preamble (see section V.C of this preamble). 3. HCl CEMS Measurement Range After installation, the proposed PS-18 recommends that you check, record and document the continuous emissions measurement range of the HCl CEMS to verify that the instrument is functioning correctly. Performance Specification 18 requires that the data collection device output range include zero and the upper limit of the measurement range. 4. HCl CEMS Performance Requirements and Procedures After you have installed, set up, verified, and calibrated your HCl CEMS, the proposed PS-18 requires that you follow specified performance tests and procedures for the initial demonstration of your HCl CEMS and subsequent performance evaluations of your HCl CEMS. In general, the proposed PS-18 requires that: (1) Technology used to measure gaseous HCl provides a distinct response (DR) and addresses any appropriate interference correction(s); (2) the relative accuracy (RA) be established against a reference method (RM); and (3) dynamic spiking (DS) into the CEMS using a National Institute of Standards and Technology (NIST) traceable standard may be required to demonstrate initial performance at sources with emissions near the detection level of the CEMS and for ongoing QA tests. Specific proposed PS-18 test procedures are outlined below. Interference Test. You must test to detect analyzer responses to interferences not adequately accounted for in the calibration procedure that may cause measurement bias. The combined interference response for the analyzer used for the test must not be greater than 3.0 percent of the equivalent HCl concentration used for the interference test. Beam Intensity Test for Integrated Patch CEMS (IP-CEMS). For IP-CEMS, you must establish the light attenuation tolerance of your system and demonstrate that the HCl response is independent of the beam intensity. The percent difference during the attenuated light calibration check must not be more than 3.0 percent of the measured concentration with no attenuation used for the test. Temperature Measurement Verification Procedure for IP- CEMS. You must perform a temperature verification test as part of initial installation and verification procedures for an IP-CEMS. Temperature measurement must agree with a NIST traceable calibrated temperature measuring device within 2.8 [deg]C (5.0 [deg]F). Pressure Measurement Verification Test for IP-CEMS. You must conduct a pressure measurement verification test if you have an IP-CEMS. Your pressure monitor must agree with a NIST traceable calibrated measurement device within 5 percent or <= 0.12 kilopascals (0.5 inches of water column), whichever is greater. For stack pressure verification, you should select a gauge or monitor that conforms to the design requirements of American Society of Mechanical Engineers (ASME) standard B40.100-2010, ``Pressure Gauges and Gauge Attachments'' (incorporated by reference, see Sec. 60.17). Level of Detection (LOD) Determination. You must determine the minimum amount of HCl that can be detected above the background in an HCl-free representative gas matrix (the LOD). If you choose to perform the LOD determination test in a controlled environment, you must verify the LOD during the initial field certification test using the DS test procedure (included in Appendix A of the PS). You must make three independent DS measurements at no more than five times the LOD for the detection level verification. If you cannot detect the DS HCl at the estimated LOD, you must increase the spike concentration incrementally until you establish a field verified detection level where the HCl measurement is a minimum of three times the noise for zero HCL concentration. The field verified detection level would replace the controlled environment LOD and would become the site- or installation-specific LOD. Response Time (RT) Determination. You must determine the average upscale and downscale response time as the response time for the system (the RT). This is the time it takes for the measurement system, while operating normally, to respond to a known step change in gas concentration (from a low- or zero-level to high-level gas concentration or vice versa). Stable RT measurements are made when measured HCl concentration is within five percent of the spike gas concentration (i.e., the measurements must meet the 5 percent calibration error requirement; see below). Calibration Error (CE) Test. The CE test is the mean difference between the HCl calibration gas value and the CEMS response at each calibration point expressed as a percentage of the span. The CE of your HCl CEMS must be less than five percent. Seven-Day Calibration Drift (CD) Test. Prior to conducting an RA test on your HCl CEMS, you must perform a 7-day CD test. The purpose of the 7-day CD test is to verify the ability of the CEMS to maintain calibration for each of seven, 24-hour periods. The zero-level and high-level drift for each day must be less than five percent of the span value. You must pass each day's drift checks for seven days to meet this requirement and each drift check must be recorded and reported for the 7-day drift check test. RA Test. You must determine the RA for your HCl CEMS. As noted above, the RA must be established against an RM. The RA is the absolute mean difference between the gas concentration determined by the CEMS and the value determined by the RM, plus the 2.5 percent error confidence coefficient of a series of tests divided by the average of the RM or the applicable emission standard. E. What are the reporting and recordkeeping requirements for PS-18? The proposed PS-18 specifies requirements to record and report supporting data for test procedures and calculations set out in PS-18. For example, for systems that use a gas blender and/or liquid evaporative calibrator to deliver HCl gas standards, PS-18 requires that you record and report supporting data for these devices, [[Page 27694]] including liquid feed calibrations, liquid standard(s) concentration, feed rate and gas flow calibrations for all diluent and HCl gas flows. The proposed PS-18 also requires that you record and report summaries (in tabular form) of the results of CD tests, linearity tests, RT tests, CE tests, RA tests and optional spike recovery procedures. Additionally, the proposed PS-18 requires that you record and report supporting dilution system data and LOD and system limitation verification data for installed HCl CEMS. IV. Summary of Proposed Procedure 6 A. What is the purpose of Procedure 6? This proposed procedure specifies the minimum QA requirements necessary for the control and assessment of the quality of CEMS data submitted to the EPA. The proposed Procedure 6 would have two distinct and important purposes. First, the procedure would assess the quality of the HCl CEMS data produced by estimating accuracy. Second, the procedure would assist in the control and improvement of the quality of the CEMS data by implementing QC policies and corrective actions. Both of these purposes work together to ensure that data quality is acceptable. B. Who must comply with Procedure 6? Under the proposed Procedure 6, if you are responsible for one or more CEMS used for HCl compliance monitoring, you would be required to meet the minimum requirements of Procedure 6 and are encouraged to develop and implement a more extensive QA program or to continue such programs where they already exist. The proposed Procedure 6 would apply to any HCl CEMS that is subject to PS-18. That is, if you are required under an applicable subpart to parts 60, 61, or 63 to install and operate an HCl CEMS and you choose to comply with PS-18, you would be subject to both PS-18 and Procedure 6. C. When must I comply with Procedure 6? If you are the owner or operator of an affected HCl CEMS, you must comply with Procedure 6 when you install and place into operation an HCl CEMS that is subject to PS-18 or when an existing HCl CEMS becomes subject to PS-18. D. What are the basic requirements of Procedure 6? Requirements are based on proposed PS-18. Procedure 6 includes requirements for: (1) QC plan; (2) daily quality, calibration and measurement standardization procedures; and (3) data accuracy assessment. A summary of the proposed basic requirements is presented below. 1. Quality Control Plan The proposed Procedure 6 requires that you develop and implement a QC plan that includes written procedures and manufacturer's information describing in detail complete, step-by-step measures that ensure quality data. The QC plan must cover procedures and operations for specified activities (e.g., CD checks of HCl CEMS, HCl IP-CEMS emission source temperature and pressure accuracy). Records of these written procedures must be maintained and available for inspection by enforcement agencies. The proposed Procedure 6 requires either revising the QC plan or modifying or replacing the CEMS when quality control failures occur for two consecutive quarters. 2. Daily Quality Requirements, Calibration and Measurement Procedures CD Assessment. You are required to check, record and quantify the CD at two concentration values at least once daily in accordance with the method prescribed by the manufacturer. The HCl CEMS calibration must, at a minimum, be adjusted whenever the daily zero (or low-level) CD or daily high-level CD exceeds two times the drift limits of the applicable performance specification (e.g., PS-18). Beam Intensity Requirement for HCl IP-CEMS. You must check, record and quantify the beam intensity of your IP-CEMS at least once daily according to manufacturer's specifications and procedures. If the HCl CEMS is out-of-control (the beam intensity falls outside of the operation range determined by section 11.2 of the proposed PS-18 of part 60), you must take the necessary corrective action and verify that the issue has been corrected (i.e., by documenting and reporting the results of the quality control check procedure following corrective action showing the CEMS to be operating within specifications). CEMS Data Status During Out-of-Control Period. Procedure 6 requires that CEMS data obtained during out-of-control periods not be used when calculating compliance with an emissions limit or counted toward meeting minimum data availability requirements under an applicable regulation or permit. 3. Data Accuracy Assessment Procedure 6 requires a weekly ``above span linearity'' challenge of the monitoring system with a certified calibration value greater than your highest expected hourly concentration. The ``above span'' reference gas must be introduced to the measurement system at the probe. You must record and report the results of this procedure as you would for a daily calibration. The ``above span linearity'' challenge must fall within 10 percent of the certified value of the reference gas. Temperature and Pressure Accuracy Assessment. Procedure 6 requires temperature and pressure accuracy verification for HCl IP- CEMS. The accuracy of the temperature and pressure measurement systems in each HCl IP-CEMS and stack pressure readings used with IP-CEMS data need to be verified and recorded at least once each calendar quarter (according to procedures in section 11.3 of the proposed PS-18). Procedure 6 also requires that measurement instruments or devices used to conduct verification of temperature or pressure measurement have an accuracy that is traceable to NIST. If the temperature and pressure verification exceeds criteria specified in the procedure that indicates that the HCl IP-CEMS is out-of-control, you need to take the necessary corrective action to eliminate the problem and verify that it has been corrected by repeating the failed verification (i.e., by documenting and reporting the results of the audit following corrective action showing the CEMS to be operating within specifications). Concentration Accuracy Auditing Requirements. Procedure 6 requires that the accuracy of each HCl CEMS be audited at least once each calendar quarter by a relative accuracy test audit (RATA), DS audit (DSA), a cylinder gas audit (CGA) or other acceptable alternative approved by the Administrator. Hydrogen chloride audit gases are required to be NIST certified or NIST-traceable. Procedure 6 also requires a RATA to be conducted at least once every four calendar quarters unless the affected facility is off-line. Procedure 6 would require the analysis of RM audit samples, if they are available, concurrently with RM tests as specified in the general provisions of the applicable part (i.e., based on the part [i.e., part 60, 61, or 63] that contains the subpart that requires the owner or operator to install and operate an HCl CEMS). Excessive Audit Inaccuracy. Procedure 6 requires corrective actions to eliminate problem(s) when the CEMS is out-of- control. The procedure also requires that you verify that you have eliminated the problem(s) by documenting and reporting the results of the audit following corrective action [[Page 27695]] showing the CEMS to be operating within specifications. For purposes of excessive audit inaccuracy, a CEMS is considered out-of-control when (1) RA is greater than 20 percent of the RM when RMavg is used in the denominator to determine RA or greater than 15 percent when the equivalent emission standard value in parts per million by volume wet (ppmvw) is used in the denominator to determine RA; (2) the RA of the DSA is greater than 15 percent if the average spike value is used to determine RA or greater than 20 percent of the applicable emission standard if the emission standard is used to determine RA; or (3) the error determined by the CGA is greater than five percent of span. Procedure 6 proposes that CEMS data collected during out-of-control periods not be used in calculating compliance with emission limits nor be counted towards meeting minimum data availability requirements under an applicable regulation or permit. Criteria for Acceptable QC Procedures. In situations where a CEMS experiences excessive audit inaccuracies for two consecutive quarters, the proposed procedure requires that you revise your QC procedures, or modify or replace your CEMS. Criteria for Optional QA Test Frequency. The proposed Procedure 6 specifies that, if a CEMS is determined to be in-control for eight consecutive quarters that include a minimum of two RATA, you may revise your auditing procedures to use CGA or DSA each quarter for eight subsequent quarters. Under this scenario, you would only be required to perform a RATA that meets the acceptance criteria once every two years. If a CEMS fails a RATA, CGA, or DSA, you would need to revert to the original auditing schedule until the audit results meet in-control criteria to start re-qualifying for the optional QA test frequency again. Calculations for CEMS Data Accuracy. The proposed Procedure 6 specifies RA, CGA accuracy and DSA accuracy calculation requirements. E. What are the reporting and recordkeeping requirements for Procedure 6? The proposed Procedure 6 would require that if you own or operate an affected HCl CEMS, you must report for each CEMS the accuracy and CD assessment results as a Data Assessment Report (DAR) (an example of a DAR format is provided in Procedure 6; section 9.0, Figure 1). At a minimum, the DAR must contain source owner and operator information; identification and location of monitors in the CEMS; manufacturer and model number of each monitor in the CEMS; assessment of CEMS data accuracy; and date of assessment. The DAR is required to be submitted with the report of emissions required under the applicable regulation or permit that requires continuous emission monitoring. V. Rationale for Selecting the Proposed Requirements of Performance Specification 18 and Procedure 6 A. What information did we use to develop PS-18 and Procedure 6? To develop proposed PS-18 and Procedure 6, we considered the requirements of emission standards promulgated under 40 CFR parts 60, 61 and 63; state agency requirements for CEMS; manufacturer and vendor recommendations; and current operational and design practices in the industry. As part of this consideration, the EPA's Office of Air Quality Planning and Standards (OAQPS) gathered information from instrument and gas vendors, affected facilities, testers and regulatory bodies with experience performing continuous measurements of HCl from stationary sources. Concurrent with the EPA's OAQPS' information gathering efforts, the EPA's Office of Research and Development (ORD) conducted research to establish additional data to support the new performance specification and QA test procedures. As part of the EPA's ORD's research efforts, they evaluated commercial HCl CEMS under controlled and representative emission environments, the suitability of candidate RMs and the status and quality of available gas standards. The ORD focused their testing research on interference tests, LOD tests, 7-day drift, linearity, RATAs and DS. B. How did we select the requirements for PS-18 and Procedure 6? Generally, the basic requirements proposed under PS-18 and Procedure 6 for calibration error, calibration drift, RATA, and cylinder gas audit agreement are consistent with other CEMS performance specifications. The proposed LOD requirements are based on an adequate safety margin so that equipment can measure quantitatively at the compliance limit. The proposed DS requirements are consistent with other RM recovery requirements (e.g., EPA Method 320, EPA Method 18). The above-span calibration and linearity requirements proposed are based on the PS-12 precedent used for mercury CEMS. During the development of the proposed PS-18 and Procedure 6, we evaluated all options and attempted to develop the most appropriate performance specifications and procedures based on available information, testing and feedback from vendors and industry regarding the use of HCl CEMS. Although we believe this proposal includes the most appropriate HCl CEMS performance specifications and procedures (for use as an alternative to PS-15 for HCl CEMS), we are soliciting comment on several issues provided in paragraph V.C of this preamble. C. Solicitation for Comment 1. Performance Specification 18 Topics a. Integrated Path (IP-CEMS) Line Strength Factor Calibration error procedures proposed for IP-CEMS in PS-18 require correcting for calibration cell path length, temperature, pressure, line strength factor (LSM) and, if necessary, the native source gas HCl concentration when you calculate the stack equivalent concentration of the HCl gas measured in your calibration cell. The proposed specification allows the use of the line LSM provided by the instrument manufacturer or an instrument-specific LSM experimentally determined using a heated gas cell at effective gas concentrations equivalent to between 50 and 150 percent of the emission limit. We are soliciting comment on approaches used by IP instrument vendors to determine LSM and data showing the effect of LSM on the accuracy of the stack equivalent concentration calculation. b. Optical Measurement Path Length Determination An IP-CEMS measures the gas concentration along an open optical path across the stack or duct cross section. Specifically, for IP-CEMS, measurement path is the distance of the optical path that passes through the source gas in the stack or duct correcting for ports, standoffs, and extensions or CEM-specific optical path length alterations. The optical measurement path length must be measured and not based on engineering diagrams. We are requesting information on procedures currently available to measure the optical path length for IP monitors that will result in an accuracy of at least 1 percent. (See PS-1 of Appendix B to Part 60 (Specifications and Test Procedures for Continuous Opacity Monitoring Systems in Stationary Sources); section 8.1.) [[Page 27696]] c. Alternative CEMS Probe Placement Locations Section 8.3 of the proposed PS-18 specifies HCl measurement location requirements downstream of the control device, point of pollution generation or other point at which a change of pollutant concentration may occur and upstream of the exhaust. We are seeking comment and supporting data on alternative probe placement locations such as in the breeching of the stack (i.e., in the exhaust duct or pipe that leads from the stack) that pass the RATA requirements. 2. Appendix F Procedure 6 Topics a. Effect of Temperature and Pressure on HCl Concentration Determination During DS Measurements We provided options in Appendix F Procedure 6 for initial and ongoing quality control using DS for IP-CEMS. The procedure to perform DS is described in Appendix A of PS-18. For IP-CEMS, dynamic spiking is a standard addition procedure where you spike a known concentration of HCl gas into a calibration cell. You are required to assess the accurate recovery of HCl introduced into the measurement system in the presence of potential interference from the flue gas sample matrix. The measurement involves recording the combined optical signal from HCl in the calibration cell at ambient temperature and HCl in the stack at elevated temperature. The combination of HCl absorbance at two different temperatures would create hybrid spectra features of both temperatures. Based on our evaluation, we understand there can be as much as a 10 percent difference line shape/area used for IP measurements between instrument operating temperature near 20[deg]C and typical stack temperatures up to 250[deg]C. We are requesting comment on procedures that can be used to determine the concentration when IP calibration cells contain HCl at ambient temperature (approximately 20[deg]C) or the need to heat the calibration cell to a specific temperature during DS measurements that include absorbance for both stack gas (HCl) at elevated temperature and ambient temperature calibration cell HCl. b. Use of Dynamic Spiking The proposed PS-18 and Procedure 6 require that you audit the accuracy of each HCl CEMS at least once each calendar quarter (except the quarter the RATA is conducted) by a DSA, a CGA or other acceptable alternative. Appendix A to the proposed PS-18 describes the procedure and performance requirements for DS as a quality check for HCl CEMS. We are proposing this option as one of three alternatives to a RATA in three of the four quarterly QA checks required in Procedure 6. We are soliciting comment on our proposal and data on the use of periodic DS as an alternative to the use of a CGA. c. Alternative QA for Low Level RM RATA Measurements We are proposing a mandatory RATA with the appropriate RM during initial demonstration and periodically thereafter. We are also soliciting comment and data on alternative or additional QA that should be performed when the stack HCl concentration is below the RM quantitation limit. d. Long-Term Quality Control Under Procedure 6 The proposed Appendix F to part 60 (Quality Assurance Procedure 6) requires a RATA at least once every four calendar quarters, except in the case where the affected facility is off-line (does not operate in the fourth calendar quarter since the quarter of the previous RATA). Section 5.5 of the procedure specifies that if the CEMS is in-control for eight consecutive quarters that include a minimum of two RATA, you may revise your auditing procedures to use CGA or DSA each quarter for eight subsequent quarters, but you must perform at least one RATA and demonstrate that the source meets the acceptance criteria every 2 years. We are requesting comments and data on alternative grace periods allowed between required RATAs when your audits demonstrate that the source has been in-control long-term under Procedure 6. e. Method 205 to Generate Cylinder Gas Audit Concentrations for Quarterly Audits Section 7.3 (Reagents and Standards) of the proposed PS-18 allows the use of diluted high concentration HCl standards to achieve the HCl gas concentrations required in PS-18 as long as you follow Method 205 or other procedures approved by the Administrator. We are soliciting comment and data comparing the uncertainty of gases generated by dilution using Method 205 to the tolerance allowed for cylinder gas audits in section 5.2.2.3 of Procedure 6 proposed for 40 CFR part 60, Appendix F. f. Direct Instrument Cell Calibration Checks As noted previously, for extractive CEMS, DS involves adding a known concentration of HCl gas at a known flow rate into the probe sample gas stream to assess the ability of the measurement system to recover and accurately measure HCl in the presence of potential interference from the flue gas matrix. We are considering an alternative that includes instrument calibration checks for extractive CEMS and request comment and supporting data on two topics related to calibration check procedures: (1) What is the feasibility of achieving DS accuracy to 95 percent of the theoretical spike at the span concentration? and (2) If calibration checks are performed at the instrument for extractive CEMS, what is the accuracy of dynamic spike recovery? g. Using DS and Associated Acceptance Criteria as an Alternative to Daily Calibration Check for Quality Assurance Procedure 6 Calibration drift is a quantitative assessment of whether your HCl CEMS measurements are in control. Checking calibration also allows the facility to reset the calibration and improve the consistency and quality of HCl CEMS data. We are considering using dynamic spiking as an alternative to direct cylinder gas assessment of calibration drift as a measure of QC for HCl CEMS. We are taking comment and data on the quantitative comparison of dynamic spike recovery results compared to CD results to determine if there are comparable criteria for DS to qualify as an alternative for CD tests. h. Moisture Measurements To Correct HCl Results Section 6.8 (Moisture Measurement System) of the proposed PS-18 stipulates that, if correction of the measured HCl emissions for moisture is required, either Method 4 in Appendix A-3 of part 60 or other moisture measurement methods approved by the Administrator will be needed to measure stack gas moisture content. We are requesting comment/data on conditions or situations where continuous moisture measurements should be required to correct HCl results to the units of the standard, and where periodic Method 4 tests or equivalent is good enough on a periodic basis to define moisture for the entire duration between Method 4 tests. i. Other Initial or On-Going Procedures for IP-CEMS We are soliciting comment/data on other initial or on-going procedures for [[Page 27697]] IP-CEMS not included in the proposal that are commonly performed and necessary to ensure data are of known and acceptable quality to demonstrate compliance. VI. Statutory and Executive Order Reviews A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review This action is not a ``significant regulatory action'' under the terms of Executive Order 12866 (58 FR 51735, October 4, 1993) and is therefore not subject to review under Executive Orders 12866 and 13563 (76 FR 3821, January 21, 2011). B. Paperwork Reduction Act This action does not impose an information collection burden under the provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. Burden is defined at 5 CFR 1320.3(b). This action provides performance criteria and QA test procedures for assessing the acceptability of HCl CEMS performance and data quality. These criteria and QA test procedures do not add information collection requirements beyond those currently required under the applicable regulation. C. Regulatory Flexibility Act The Regulatory Flexibility Act (RFA) generally requires an agency to prepare a regulatory flexibility analysis of any rule subject to notice and comment rulemaking requirements under the Administrative Procedure Act or any other statute unless the agency certifies that the rule will not have a significant economic impact on a substantial number of small entities. Small entities include small businesses, small organizations, and small governmental jurisdictions. For purposes of assessing the impacts of this rule on small entities, small entity is defined as: (1) A small business as defined by the Small Business Administration's regulations at 13 CFR 121.201; (2) a small governmental jurisdiction that is a government of a city, county, town, school district or special district with a population of less than 50,000; and (3) a small organization that is any not-for- profit enterprise which is independently owned and operated and is not dominant in its field. After considering the economic impacts of this rule on small entities, I certify that this action will not have a significant economic impact on a substantial number of small entities. This proposed rule will not impose any requirements on small entities. We continue to be interested in the potential impacts of the proposed rule on small entities and welcome comments on issues related to such impacts. D. Unfunded Mandates Reform Act This action contains no federal mandates under the provisions of Title II of the Unfunded Mandates Reform Act of 1995 (UMRA), 2 U.S.C. 1531-1538, for state, local or tribal governments or the public sector. This action imposes no enforceable duty on any state, local or tribal governments or the private sector. Therefore, this action is not subject to the requirements of sections 202 or 205 of UMRA. This action is also not subject to the requirements of section 203 of the UMRA because it contains no regulatory requirements that might significantly or uniquely affect small governments. This rule will not apply to such governments and will not impose any obligations upon them. E. Executive Order 13132: Federalism This action does not have federalism implications. It will not have substantial direct effects on the states, on the relationship between the national government and the states or on the distribution of power and responsibilities among the various levels of government, as specified in Executive Order 13132. Thus, Executive Order 13132 does not apply to this action. In the spirit of Executive Order 13132 and consistent with EPA policy to promote communications between the EPA and state and local governments, the EPA specifically solicits comment on this proposed rule from state and local officials. F. Executive Order 13175: Consultation and Coordination With Indian Tribal Governments This action does not have tribal implications, as specified in Executive Order 13175 (65 FR 67249, November 9, 2000). This action proposes performance specifications that can be used as an additional option to PS-15 for HCl continuous emissions monitoring. Thus, Executive Order 13175 does not apply to this action. The EPA solicits additional comment on this proposed action from tribal officials. G. Executive Order 13045: Protection of Children From Environmental Health Risks and Safety Risks The EPA interprets Executive Order 13045 (62 FR 19885, April 23, 1997) as applying only to regulatory actions that are based on health or safety risks, such that the analysis required under section 5-501 of the Executive Order has the potential to influence the regulation. This action is not subject to Executive Order 13045 because it does not establish an environmental standard intended to mitigate health or safety risks. H. Executive Order 13211: Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution, or Use This action is not subject to Executive Order 13211 (66 FR 28355 (May 22, 2001)), because it is not a significant regulatory action under Executive Order 12866. I. National Technology Transfer and Advancement Act Section 12(d) of the National Technology Transfer and Advancement Act of 1995 (NTTAA), Public Law 104-113, 12(d) (15 U.S.C. 272 note) directs the EPA to use voluntary consensus standards (VCS) in its regulatory activities unless to do so would be inconsistent with applicable law or otherwise impractical. Voluntary consensus standards are technical standards (e.g., materials specifications, test methods, sampling procedures, and business practices) that are developed or adopted by VCS bodies. The NTTAA directs the EPA to provide Congress, through OMB, explanations when the agency decides not to use available and applicable VCS. This proposed rule does not involve technical standards. Therefore, the EPA is not considering the use of any voluntary consensus standards. J. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations Executive Order 12898 (59 FR 7629, February 16, 1994) establishes federal executive policy on environmental justice. Its main provision directs federal agencies, to the greatest extent practicable and permitted by law, to make environmental justice part of their mission by identifying and addressing, as appropriate, disproportionately high and adverse human health or environmental effects of their programs, policies, and activities on minority populations and low-income populations in the United States. The EPA has determined that this proposed rule will not have disproportionately high and adverse human health or environmental effects on minority or low-income populations [[Page 27698]] because it does not affect the level of protection provided to human health or the environment. This proposed rule will help to ensure that emission control devices are operated properly and maintained as needed, thereby helping to ensure compliance with emission standards, which would benefit all affected populations. Performance Specification 18--Specifications and Test Procedures for Gaseous HCl Continuous Emission Monitoring Systems at Stationary Sources List of Subjects in 40 CFR Part 60 Environmental protection, Administrative practice and procedure, Air pollution control, Continuous emission monitoring systems, Hydrogen chloride, Performance specifications, Test methods and procedures. Dated: April 30, 2014. Gina McCarthy, Administrator. For the reasons stated in the preamble, the Environmental Protection Agency proposes to amend title 40, chapter 1 of the Code of Federal Regulations as follows: 0 1. The authority citation for part 60 continues to read as follows: Authority: 42 U.S.C., 7401-7671q. 0 2. Appendix B is amended by adding Performance Specification 18 and Appendix A to Performance Specification 18 to read as follows: Appendix B to Part 60--Performance Specifications * * * * * PERFORMANCE SPECIFICATION 18--PERFORMANCE SPECIFICATIONS AND TEST PROCEDURES FOR GASEOUS HYDROGEN CHLORIDE (HCl) CONTINUOUS EMISSION MONITORING SYSTEMS AT STATIONARY SOURCES 1.0 Scope and Application. 1.1 Analyte. This performance specification (PS) is applicable for measuring gaseous concentrations of hydrogen chloride (HCl), CAS: 7647-01-0, on a continuous basis in the units of the applicable standard or in units that can be converted to units of the applicable standard(s). 1.2 Applicability. 1.2.1 This specification is used to evaluate the acceptability of HCl continuous emission monitoring systems (CEMS) at the time of installation or soon after and when regulations require reevaluation of HCl CEMS performance. The specification includes requirements for initial acceptance including instrument accuracy and stability assessments. 1.2.2 The Administrator may require the operator under section 114 of the Clean Air Act (CAA), to conduct CEMS performance evaluations at other times besides the initial test to evaluate the CEMS performance. See 40 CFR part 60, Sec. 60.13(c) and Sec. 63.8(e)(1). 1.2.3 A source that demonstrates their CEMS meets the criteria of this PS may use the system to continuously monitor gaseous HCl. If your HCl CEMS is capable of reporting the HCl concentration in the units of the existing standard, no additional CEMS components are necessary. If your HCl CEMS does not report concentrations in the units of the existing standard, then other CEMS components (e.g., oxygen (O 2 ), temperature, stack gas flow, moisture and pressure) are necessary to convert the units reported by your HCl CEMS to the units of the standard. 1.2.4 These specification test results are intended to be valid for the life of the system. As a result, the HCl measurement system must be tested and operated in a configuration consistent with the configuration that will be used for ongoing continuous emissions monitoring. 1.2.5 Substantive changes to the system configuration require retesting according to this PS. Examples of such conditions include, but are not limited to: major changes in dilution ratio (for dilution based systems); changes in catalyst materials, if used; changes in sample conditioning, if used, such as filtering device design or materials; changes in probe design or configuration; light source or detector substitution; and changes in materials of construction. 1.2.6 This specification is not designed to evaluate the ongoing CEMS performance nor does it identify specific calibration techniques and auxiliary procedures to assess CEMS performance over an extended period of time. The source owner or operator is responsible to calibrate, maintain, and operate the CEMS properly. 2.0 Summary of Performance Specification. 2.1 This specification covers the procedures that each HCl CEMS must meet during the performance evaluation test. Installation and measurement location specifications, data reduction procedures and performance criteria are included. 2.2 The technology used to measure gaseous HCl must provide a distinct response and address any appropriate interference correction(s). It must accurately measure gaseous HCl in a representative sample (path or point sampling) of stack effluent. 2.3 The relative accuracy (RA) must be established against a reference method (RM) (e.g., Method 26A, Method 320, ASTM International (ASTM) D6348-12, including mandatory annexes, or Method 321, as appropriate for the source concentration and category). 2.4 Dynamic spiking (DS) into the CEMS using a National Institute of Standards and Technology (NIST) traceable standard may be required to demonstrate performance at sources with emissions near the detection level of the CEMS and for ongoing quality assurance tests. 3.0 Definitions. 3.1 Calibration Cell means a gas containment cell used with cross stack or integrated path (IP) monitors to perform precision and calibration checks. The cell may be a removable sealed cell or an evacuated and/or purged cell capable of exchanging calibration and zero gases. When charged, it contains a known concentration of HCl calibration gas. The calibration cell is filled with zero gas or removed from the optical path during stack gas measurement. 3.2 Calibration Drift (CD) means the absolute value of the difference between the CEMS output response and an upscale reference or a zero-level reference, expressed as a percentage of the span value, when the CEMS is challenged after a stated period of operation during which no unscheduled maintenance or repair took place. A separate CD determination must be performed for pollutant and diluent analyzers. 3.3 Calibration Error (CE) means the mean difference between the concentration measured by the CEMS and the known concentration from a calibration standard, divided by the span, when the entire CEMS, including the sampling interface, is challenged. 3.4 Calibration Range Above Span (CRAS) means the upper limit of the measurement range. The calibration range must accommodate the DS procedure if that option is selected. The CRAS should be a conservatively high estimate of the range of HCl measurements expected from the source category. The CRAS value defines the calibration and quality assurance at the upper limit of HCl concentration measurement. The CRAS may require a calibration standard above span. 3.5 Centroidal Area means a central area that is geometrically identical to the stack or duct cross section and is no greater than ten percent of the stack or duct cross-sectional area. 3.6 Continuous Emission Monitoring System (CEMS) means the total equipment required to measure the pollutant concentration or emission rate continuously. 3.7 Continuous Operation means the time between periodic maintenance when an instrument and sampling system operates without user intervention, continuously samples flue gas, analyzes the sample gas for HCl and related parameters (e.g., gas flow, diluent), records measurement data, and saves the results to a computer file. User intervention is permitted for initial set-up of sampling system, initial calibrations, periodic calibration corrections, periodic maintenance and periodic quality assurance audits. 3.8 Data Recorder means the portion of the CEMS that provides a permanent record of analyzer output. The data recorder may record other pertinent data such as effluent flow rates, various instrument temperatures or abnormal CEMS operation. The data recorder may also include automatic data reduction capabilities and CEMS control ca
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