(Adopted January 9, 1976)(AmendedApril l,1977)(Amended August 5,1977) (Amended April 6,1979)(Amended August 7,198l)(AmendedMay 14,1999)



### RULE218. 

### CONTINUOUS EMISSIONMONITORING

(a) Definitions (1) ANALYZER- the part of the continuous emission monitoring system (CEMS) that analyzes the appropriate gaseous constituents of the conditioned gaseous sampleor measures stackgasvolumetric flowand fuel flow rates, as applicable. (A) Contaminant Analyzer 

### - the part of the CEMS that detects the air contaminant and represents those concentrations in a signal output. (B) Diluent Analyzer 

## - the part of the CEMS that detects oxygen, carbon dioxide or other diluent gas concentrations and represents those concentrationsin a signal output. (C) Fuel Flowmeter 

### - the part of the CEMS that detects the parameters of all essential measurement sub-systems (e.g., temperature, pressure, differential pressure, frequency, gas density, gas composition, heating value) and generates signal outputs which are a function of the fuel flow rate and all essential measurement sub-systemparameters. (D) Stack Flowmeter 

### - the part ofthe CEMS that detects the parameters from all essential measurement sub-systems (e.g., temperature, static and atmosphericpressure, gas density, gas composition, molecularweight, gas moisture content) and generates signal outputs which are a function of the stack gas volumetric flow rate and all essential measurement sub-system parameters. (2) CALIBRATION 

### - a procedure performed to ensure that the CEMS accurately measures and record air contaminant or diluent gas concentration, flow rate and other parameters necessary to generate data, as evidenced by calibration checks, and achievedby periodicmanual or automaticadjustment.



### (3) CALIBRATION CHECK 

## - a procedure performed to determine the CEMS

response to a given gaseous compound concentration. A certified calibrationgas mixture isinjected intothe CEMSas closeto the probe tip aspractical. (4) CERTIFIED CEMS - a CEMS installed, tested, operated, maintained, and calibrated according to the applicable requirements of Rule 218; that has met the applicable performance specifications according to Rule 218(c)(l)(B), and, hasRule218 (Cont.) (Amended 

### May 14,1999)

received written approval and conditions thereto applying, from the Executive Officer. CERTIFIED GAS MIXTURE 

### - a gas mixture manufactured, analyzed and certified according to "EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards" - EPA-600/R97/121, September 1997 Revision (EPA Protocol) or any subsequent version published by EPA. This definition incorporatesby reference EPA Protocol. CONTINUOUS EMISSION MONITORING SYSTEM (CEMS) 

## - the total combined equipment and systems required to continuously determine air contaminants and diluent gas concentrationsand/or mass emission rate of a source effluent (as applicable). The CEMS consistsof three major subsystems: sampling interface, analyzer and data acquisition system. CONTINUOUS MONITORING 

## - monitoring in which a minimum of one measurement (e.g., concentration,mass emission, flowrate) is taken and recorded each minute. DATA ACQUISITION SYSTEM (DAS) 

## - the part of the CEMS that processes data generated by the analyzer and records the results, thus creating a permanent record of the output signal in terns of concentration,flow rate, and/or any other applicable parameter necessaryto generatethe required data in units of applicable standard. The DAS consists of all equipment such as a computer required to

convertthe original recorded values to any valuesrequired forreporting. DILUENT G.4S 

### - a gas present in a calibration gas mixture or in the source emissions which is present in quantities significantly larger than the air contaminant. LABORATORY APPROVAL PROGRAM (LAP) 

### - a program administered by the District that grants test-method-specific approvals to independent testing laboratories or firms that perform tests to determine source compliance with District rules and regulations. MODIFICATION REQUIRINGRECERTIFICATION

### - any change to thebasic equipment, control equipment, contaminantconcentration, interfering substances,

or CEMS (or SCEMS) that isdeemedby the Executive Officer to have a potential for adversely affecting the ability ofthe CEMSto provide accurate, precise and timely datarepresentative of the stackemissions for which the CEMS (or SCEMS) isrequired. QUALITY ASSURANCE/QUALITY CONTROL (QNQC) PLAN 

### - a written document in which the specific procedures for the operation, calibration andRule 218 (Cont.) (Amended 

### May 14,1999)

maintenance of a certified CEMS are described in detail, including additional quality assurance assessments and the corrective action system. The purpose of thisplan isto ensure that the CEMS generates, collects and reports valid data that is precise, accurate, complete, and of a quality that meets the requirements, performance specifications, and standardsofRules 218 and 218.1. (1

### 3) ROUTINE MAINTENANCE 

### - preventive evaluation and repair (ifnecessary) of CEMS performed at specified intervals to preclude system failure. Routine maintenance may be performed as recommended by the manufacturer or a documented standard operating procedure determined through operating experience and approved by the Executive Officer. Repairs to a malfunctioning system are excluded fromthis definition. (14) SAMPLING INTERFACE 

### - that part of the CEMS that performs sample acquisition using one or more of the following operations: extraction, physical/chemical separation, transportation or conditioning of a representative samplefrom a designated source. (15) SEMI-CONTINUOUS EMISSION MONITORING 

## - a monitoring technique in which a minimum of one measurement (e.g. concentration, mass emission, flow rate) is taken and recorded every fifteen (1

### 5)minutes. (16) SEMI-CONTINUOUS EMISSION MONITORING SYSTEM (SCEMS) 

### - the total combined equipment and systems to semi-continuously determine air contaminant and diluent gas concentrations andfor the mass emission rate in a source effluent (as applicable) The system consists of three major subsystems: sampling interface, analyzer and data acquisition system. This class of monitoring includes but is not limited to gas chromatography, integrated sensitized tape analyzer,other sample integrationbased technologies, and time-shared CEMS. (17) SYSTEM FAILURE 

## - inability of the CEMS to meet the requirements of Rule 218.1, "Continuous Emission Monitoring Performance Specifications", or, Code of Federal Regulations, Title 40 

### - "Protection of Environment", Part 60 

### - "Standards of Performance for New Stationary Sources", Appendix F 

## - "Quality Assurance Procedures". (18) TIME-SHARING 

### - a monitoring technique where an analyzer and possibly the associated sample conditioning system is used onmore than one source. (1

### 9) WORKINGDAY 

### - Monday throughFriday excluding holidays. (20) ZERO CHECK- a procedure performedto determine the response of the CEMSto

a given zero gas standard by means of injecting the zero gas into the CEMS as close to the probe tip aspractical.Rule218 (Cont.) (Amended May 14,1999)

(21) ZERO GAS 

### - a gas containing less than a specified amount ofthe air contaminant

or diluent gas which, when periodically injected into the CEMS, is used to check CEMS' response to the absence ofthe air contaminant or diluent gas.



### (b) Applicability and Monitoring Requirements forNew, Modified and Existing CEMS (1) The provisions of this Rule shall apply to all sources that require CEMS as specified in the regulations orpermit conditions, withthe following exceptions: (A) This Rule shall not apply to CEMS subject to Regulation 

### XX 

## - "Regional Clean Air Incentives Market (RECLAIM)", Regulation IX 

## - "New Source Performance Standards (NSPS)", Regulation X 

### - National Emission Standards for Hazardous Air Pollutants (NESHAPS), or Regulation 

### XXXI



### - "Acid Rain Program". 

### (B) This Rule shall not apply to CEMS subject to permit conditions where the

purpose of the CEMS is to monitor the performance of the basic and/or control equipment and not to determine compliance with any applicable limit or standard. 

# - (C) This Rule shall not apply to CEMS where alternative performance specifications are required by another District rule. (2) The owner or operator of any equipment subject to this Rule shall provide, properly install, operate, and maintain in calibration and good working order a certified CEMS to measure the concentration and/or emission rates, as applicable, of air contaminants and diluent gases, flow rates, and other required parameters. The owner or operator shall also provide the necessary records and other data necessary to calculat air contaminant emission rates or concentrations, as specified in Rule 21 8, Sections (e) and (f).

(c) RequirementsforIVew and Modified CEMS and SCEMS (1) Application and Approval Requirements forNew and Modified CEMS (A) The owner or operator ofany equipment subject to this Rule shall submitto the Executive Officer an "Application for CEMS" or "Application for CEMS Modification", as applicable. Any application submitted on or after May 14, 1999, shall require an initial approval by the Executive Officer prior to installation of a new CEMS or modification of an existing CEMS. The Executive Officer shall notify the applicant in writing within 

### 60 calendar days of receipt of an application for a new CEMS, or within 

### 30Rule218 (Cont.) (Amended May 14,1999)

calendar days of receipt of an application for a modification to an existing CEMS, if the application contains sufficient information to be deemed complete. Where an application has been determined to be incomplete, the Executive Officer shall request specific information needed to complete the application. Upon receipt of any complete resubmittal or the additional information, plans or specifications after the application has been deemed incomplete, a new 30-day period shall begin during which the Executive Officer shall determine the completeness of the application and notify the applicant. Within 90 days of installation, a person operating or using CEMS shall undertake a series of certification tests. If the equipment served by the CEMS is not operating at the time of complete CEMS installation, then the CEMS shall undergo a series of certification tests within 90 days from the next start-up of the equipment served by the CEMS. The purpose of the certification tests is to demonstrate the CEMS performance pursuant to the specifications in accordance with the provisions of Rule 218, Section (c)(l)(B). The owner or operator shall notify the Executive Officer in writing at least 14 days before the scheduled certification test dates. The certification tests shall be performed by a testing laboratory approved under the District Laboratory Approval Program. Data from such tests shall be submitted to the Executive Officer within 45 days following test completion. If satisfactory performance is demonstrated, final approval of the CEMS shall be granted. Subsequent operation and maintenance of the certified CEMS shall be in accordance with the provisions of Rule 218, Section (c)(l)(B). After final approval, modifications made to the CEMS shall be reviewed and approved by the Executive Officer according to the specifications stipulated in Rule 218, Section (c)(l)(B), and may require all or a portion of performance tests to be conducted. (B) Upon submission of an "Application for CEMS" or "Application for CEMS Modification" as prescribed in Rule 218 Section (c)(l)(A), the applicant shall indicateeither one ofthe following conditions: (i) That the CEMS shall be reviewed and certified according to the provisions of Rule 2 18.1, "Continuous Emission Monitoring Performance Specifications", Section (b), and the subsequent operation and maintenance of the certified CEMS shall be inRule218 (Cont.) (Amended May 14,1999)

accordance with the provisions of Rule 218, Sections (b), (e), (f) and (g) and ofthe requirements ofRule 218.1 (b) and (d), or, (ii) That the CEMS shall be reviewed and certified according to the applicableprovisions of the Code ofFederal Regulations, Title 40 

### - "Protection of Environment", Part 60 

### - "Standards of Performance for New Stationary Sources" (40CFR60), Appendix B 

## - "Performance Specifications" (Appendix B), and the subsequent operation and maintenance of the certified CEMS shall be 

### in accordance with the provisions of Rule 218, Sections (b), (e), (f) and (g), and the requirements of 40CFR60, Appendix F 

### - "Quality Assurance Procedures" (AppendixF). Notwithstanding the requirements of Section (c)(l)(B)(ii), any alternativetest methods for 40CFR60,Appendices B and F shall be thosethat are listed in Rule 2 18.1, Table 1

### - ReferenceMethods. 

### (C) A "Notification of Pre-Approved Modification" and report of results of prescribed quality assurance checks may be submitted in-lieu of the "Application for CEMS Modification" when the modification has been made in accordance with the written technical guidance document approved by theExecutiveOfficer. (2) Application and Approval Requirements for New and Modified SCEMS (A) In-lieu of submitting an application for CEMS per Rule 218, Section (c)(l), the owner or operator of any equipment subject to this Rule, may elect to submit an application for a SCEMS if the averaging time for the applicablelimits(s)for which the CEMS isrequired is 24 hours or greater; or, if the owner or operator demonstrates, to the satisfaction of the Executive Officer,that no CEMStechnology is commercially available for the applicablecontaminantand the applicable limits. (B) If the conditions in Rule 218, Section (c)(2)(A), above, do not apply, the

owner or operator of any equipment subject to this Rule may still elect to submit an application for a SCEMS in lieu of a CEMS, sudject to the following: (i) The owner or operator demonstratesthat the concentrationsand/or emissions required to be monitored would be equivalent to that monitored by a CEMS for the applicable averaging period, to the satisfactionof the Executive Officer;Rule218 (Cont.) (Amended May 14,1999)

(ii) The SCEMS shallbe capable to take and record a minimum of one measurement (concentration, mass emission rate andlor flow rate,

as applicable) every 15 minutes allowing as equally spaced data points aspractical; (iii) The owner or operator shall include inthe QNQCplan the method of calculating the 15-minute averages for compliance determination to the applicable limit or standard; (iv) If an exeedance of the allowable limit or standard is calculated using fewer than 100% valid data points, then the District shall use any relevant data for the operation of the equipment (basic and control, asapplicable)to verifjthe calculated exeedance; (v) If a time shared SCEMS isproposed, it shall meet the performance specifications ofRule 2 1 8.1, Section (e); (C) The requirements for the application submittal and approval of CEMS as provided in Rule 218, Section (c)(l) shall also apply for SCEMS applications. (3) Operation ofCEMS or SCEMS During Certification Testing CEMS or SCEMS shall be certified asconfigured for the normal operation of the CEMS or SCEMS with respect to sample acquisition, sample conditioning, pollutant/diluent detection, data requirements and reporting. (4) Quality AssuranceIQuality Control Plan forNew orModified CEMS or SCEMS (A) The owner or operator of CEMS or SCEMS who elects the performance specifications according to Rule 218, Section (c)(l)(B)(i), shall submit to the Executive Officer for approval a CEMS QNQC Plan within 45 days of CEMS installation and no later than 30 days before the certification

tests. (B) Alternative Quality Assurance Practices The owner or operator of CEMS or SCEMS who elects the performance specifications according to Rule 218, Section (c)(l)(B)(i), may choose to develop alternative CEMS operational test requirements to be included in the CEMS QNQC procedures that assure data of equivalent or better quality. These alternative QNQCprocedures shall be submitted with the facility QNQC Plan and are subject to the approval of the Executive Officer. (d) Requirements for Existing CEMS and SCEMS (1) Requirements for Existing CEMSRule 218 (Cont.) (Amended May 14,1999)

(A) A CEMS installed and granted final approval before May 14, 1999 shall be maintained and operated according to the provisions of Rule 218, Sections (b), (e), (f) and (g), and the requirements of Rule 218.1, Sections (c) and (4. (B) A CEMS application for initial and final approval submitted to the Executive Officerbefore May 14, 1999shall be reviewed and approved by the Executive Officer according to the specifications and requirements of Rule 2 18.1, Sections(c) and (d). After final approval, the CEMS shall be operated and maintainedaccordingto the provisions of Rule 218, Sections (b), (e), (f) and (g), and the requirements of Rule 218.1, Sections (c) and (dl. (C) Modifications requiring recertification to any existing CEMS shall be reviewed and approved according to the conditions under Rule 218 Section (c)(l)(B)(i) or (ii), 

### as applicable. After final approval, the modified CEMS shall be operated and maintained according to the conditionsunder Rule 218, Section(c)(l)(B)(i) or (ii), as applicable. (D) (i) All existing CEMS as prescribed in Rule 218, Sections (d)(l)(A) and (B) shall comply with the provisions of Rule 2 1 8.1, Sections (b) and (d), or40CFR60Appendices B and 

### F, as applicable, and of Rule 218, Sections 

### (b)and (c), 110laterthan May 14,2006. (ii) Therequirements of Rule 218, Section (d)(l)(D)(i) shallbe waived for a period of three years ifthe owner or operatordemonstrates,to the satisfactionof theExecutive Officer, that the existing CEMS is providing datathat are of a quality commensuratewith the original performance specifications and other indicators of consistent data quality. Dataquality factors that will be consideredinclude: (I) RelativeAccuracy (11) CalibrationError (111) CalibrationDrift (IV) Zero Drift (V) Valid datareturn percentage (VI) Availabilityorup-timepercentage (VII) Breakdown frequency and duration (VIII) Excursionsbeyond quality control limits in QA plan. The owner or operator may apply for a waiver under this subsection every three years after May 14, 2006. This sub-sectionRule 218 (Cont.) (Amended May 14,1999)

shall not apply to existing CEMS that are required to comply with the provisions of Rule 218.1, Sections 

### (b) and (d), or, 40 CFR60, Appendices B and 

### F, as applicable, and Rule 218, Sections (b) and (c), as a result of CEMS modifications requiring recertification, rule implementation, or, compliance with a permit condition. (E) The owner or operator of existing CEMS shall develop and implement a written Quality Assurance1 Quality Control (QAIQC) Plan no later than May 14, 2000. The written QNQC Plan shall be kept on record and available for inspection upon request by the Executive Officer. (F) On or before May 14, 2005, the owner or operator of any existing CEMS shall submitto the Executive Officer for approval: (i) A certification signed by an authorized representative of the facility that the existing CEMS meets the requirements of Rule 2 18, Section (c), or, (ii) An "Application for CEMS Modification", with the applicable fee(s) as specifiedin Rule 301, or, (iii) An application for waiver according to Rule 218, Section 

# - (d)(l)(D)(i), with documentation supporting the required demonstration; (2) Requirements forExisting SCEMS (A) A SCEMS installed and granted final approval before May 14, 1999 shall be maintained and operated according to the provisions of Rule 218, Sections 

### (b), (e), (f)and (g), and the requirements of Rule 218.1, Sections (4 and (dl. (B) A SCEMS application for initial and final approval submitted to the Executive OfficerbeforeMay 14, 1999shall be reviewed and approved by the Executive Officer according to the specifications and requirements of Rule 218.1, Sections (c) and (d). After final approval, the SCEMS shallbe operated and maintained according to the provisions ofRule 218, Sections (b), (e), (f)and (g), and the requirements of Rule 21 8.1, Sections (c) and (4- (C) Modifications requiring recertification to any existing SCEMS shall be reviewed and approved according to the conditions under Rule 218 Section (c)(l)(B)(i) or (ii), as applicable. After final approval, the modified CEMS shall be operated and maintained according to the conditionsunder Rule 218,Section(c)(l)(B)(i) or (ii), as applicable.Rule 218 (Cont.) (Amended May 14,1999)



### (D) The owner or operator of an existing SCEMS operating on or before May 14, 1999 shall be required to comply with the provisions of Rule 218.1 Section (e) 

### - "Time Sharing Requirements" and with the provisions of Rule 218.1 Sections (b) and (d), or, 40CFR60 Appendix 

### B and F, 

### as applicable, when the equipment served by the time-shared SCEMS is modified such that: (i) One or more of the sourcesmonitored requires a new monitoring

range, (ii) The operatingpermit ismodified to require continuous monitoring,

or, (iii) 

### An applicable source specific rule is adopted or revised to require continuousmonitoring. Subsequent operation and maintenance of the SCEMS shall be according to the provisions ofRule 218, Section(c)(l)(B)(i) or (ii), 

### as applicable. (e) Retention ofRecords forNew, Modified and Existing CEMS and SCEMS (1) The records of the data obtained from the CEMS recording devices shall clearly indicate concentrations or emission rates, or both, as specified by the Executive Officer. Records shall be maintained by the CEMS owner or operator for a minimum period of two years, unless otherwise specifically provided by another District regulation or permit conditions, and, shall be made available to the Executive Officer upon request. (2) All calculations, raw parameter data used for calculations, records of the

occurrence and duration of any start up, shutdown or malfunction, performance test, evaluation, calibration, adjustment and maintenance of the CEMS as well as calibration gas traceability shallbe retained by the CEMS operator for a minimum period of two years unless otherwise specifically provided by another District regulation or permit conditions, and shall be made available to the Executive Officer upon request.



### (f) Reporting Requirements forNew, Modified and Existing CEMS and SCEMS Unless otherwise specifically provided by another District regulation or permit conditions, the following reporting requirements shall apply to new, modified and existing CEMS and SCEMS: (1) A CEMS owner or operator shall provide a summary of the concentration andlor emission rate data, as applicable, obtained from the CEMS, as well as any additional informationspecifiedby the Executive Officer,to evaluate the accuracyRule 218 (Cont.) (Amended May 14,1999)

and precision of the measurements. The summary shall be submitted once every six months to 'the Executive Officer, except when more frequent reporting is specifically required by another District rule, or the Executive Officer, on a caseby-case basis, determines that more frequent reporting is necessary to accurately

assessthe compliance status of the source. The summaryreport shallbe submitted within 30 days following the end of the six-month period being reported, in the form and manner prescribed by the Executive Officer. The summary shall be maintained on-site in a retrievable and readable form and shall be made available to the Executive Officer upon request. The submitted summaries shall be availableforpublic inspection atthe District.

(2) The CEMS owner or operator shall report any concentrationlevel andoremission rate, as applicable, in excess of the regulated limit within 24 hours or the next working day after such occurrence in the form and manner prescribed by the Executive Officer. Thereport shall includethe following information: (A) Time intervals, date, and magnitude of the excess concentration level, nature and cause of the excess concentration (if known), corrective action(s) taken, preventive measure(s) adopted, specific location of CEMS, the equipment or CEMS involved and the facility contactperson. (B) The averaging period used for data reporting shall correspond to the averaging period specified in the rule or permit condition governing the concentration andoremissionrate, ifapplicable. (3) Reportsof CEMS Failure or Shutdown (A) The CEMS owner or operator shall notify the Executive Officer within 24 hours or the next working day, in the event of a system failure or shutdown, which exceeds 24 hours. Zero and calibration checks and routine maintenance do not require reporting. (B) In the case of a CEMS failure or shutdown, compliance with the provisions ofRule 2 18, Section(b) iswaived for a period not to exceed 96 consecutive hours. Such waiver is extended beyond 96 consecutive hours only if a petition for an interim variance is filed in accordance with Regulation V and shall terminate at the time the Hearing Board acts upon such variance petition. CEMS owners or operators of qualified facilities

may obtain a Hearing Board approval of an alternative operating condition following the established procedure in District Rule 518.2 

### - Federal Alternative Operating Condition.Rule 218 (Cont.) (Amended May 14,1999)

(C) Regularly scheduled CEMS maintenance shall be deferred until the report required under Rule 2 18, Section(f)(2)is made, ifthe system is measuring

a concentration equal to or exceeding the emission standard, and if such deferral is not reasonablyexpected to result in damage to the system. (D) Continuous emission monitoring requirements shall not apply during regular calibration checksof the system, orroutine maintenance and repair lasting 60 minutes or less. Posting ofWrittenApproval forNew, Modified and Existing CEMS and SCEMS The CEMS owner or operator of an approved CEMS shall affix a written notice of approval or a legible facsimile thereof, upon the equipment or within 26 feet of the equipment as prescribed 

### in District Rule 206, 

### in a manner such that it is clearly visible, legible, and safely accessible. In the event that the equipment is constructed or operated that the notice of approval or its legible facsimile cannot be so placed, such notice or legiblefacsimile shall be mounted on a location approvedby the ExecutiveOfficer.