(Adopted January 9, 1976)(Amended April 1, 1977)(Amended August 5, 1977) 

(Amended April 6,1979)(Amended August 7,198 l)(Amended May 14, 1999) 

PI PROPOSED AMENDED RULE 21 8 - STMX CONTINUOUS EMISSION MONITORTNG 

(g g) Definitions 

(1) ANALYZER- the part of the continuous emission monitoring system (CEMS) 

that analyzes the appropriate gaseous constituents of the conditioned gaseous 

sample or measures stack gas volumetric flow and 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 

concentrations in a signal output. 

(C) Fuel Flowmeter - the part of the CEMS that detects the parameters of all 

essential measurement sub-systems (ex.. temperature. pressure, 

differential pressure, frequency, gas density, gas com~osition. heating 

value) and generates signal outputs which are a function of the fuel flow 

rate and all essential measurement sub-system parameters. 

(D) Stack Flowrneter - the part of the CEMS that detects the parameters from 

all essential measurement sub-systems (ex., temperature. static and 

atmospheric pressure, gas density, gas composition, molecular weight, 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 

(42) CALIBRATION . . - a procedure performed to ensure 

fhaf the ---;'-...-- CEMS CEMS accurately measures and 

recordkgs sf air contaminant or diluent gas 

concentration, flow rate and other parameters necessary to generate data, as 

evidenced by calibration checks, and achieved by periodic manual or automatic 

adj ustrnent . 

(23) CALIBRATION CHECK 1 is a procedure performed to determine the CEMS 

response d%hesy%em to a given gaseous compound concentration, +mass-& 

kje&kg+ A certified calibration gas mixture is iniected into the CEMS as close 

to the probe tip as practical. +y.tem~+'.-~ sf 2 ~l

(4) CERTIFIED CEMS - a CEMS installed, tested. operated, maintained, and 

calibrated according to the applicable requirements of Rule 218; that has met the 
Rule 218 (Cont.) Amended May 14,1999 

applicable performance specifications according to Rule 21 8(c)(l MB), and, has 

received written approval and conditions thereto applying. from the Executive 

Officer. 

(6% CERTIFIED GAS MIXTURE - Is a mixture manufactured, analyzed* 

,,,1,,,., 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 incornorates by reference EPA Protocol. 
Rule 218 (Cont.) Amended May 14,1999 

t 1 2 ?--Ahcy is s . . 

(13) ?=?mST!MSis: 

(1 5 ) =xx7 cnn . . 

(4-66) STLACK ?.4GPIITm- EYETEM, r CONTINUOUS EMISSION 

MONITORING SYSTEM {CEMS) is - the total combined equipment and 

systems required &e&e continuouslv determink- -C air 

contaminants and diluent gases concentrations andlor mass emission rate iff of a 

source effluent {as apwlicable). The system CEMS consists of three major 

subsystems: sampling interface, analyzer and data acquisition system. 

tlA4 

- 

fi> 
Rule 218 (Cont.) Amended May 14,1999 

(7) CONTINUOUS MOMTORING - monitoring in which a minimum of one 

measurement (ex., concentration. mass emission, flow rate) 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 terms of concentration, flow rate, and/or any other 

applicable parameter necessary to generate the required data in units of applicable 

standard. The DAS consists of all equipment such as a computer required to 

convert the original recorded values to any values required for reporting. 

(79) DILUENT GAS - is a gas present in a calibration gas mixture or in the source 

emissions A which is present in quantities significantly larger than the 

air contaminant. 

(KjJ 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 REQUIRING RECERTIFICATION - any change to the basic 

equipment, control equipment, contaminant concentration, interfering substances, 

or CEMS (or SCEMS) that is deemed by the Executive Officer to have a potential 

for adversely affecting the ability of the CEMS to provide accurate, precise and 

timelv data representative of the stack emissions for which the CEMS (or 

SCEMS) is required. 

QUALITY ASSURANCEIQUALITY CONTROL (OAIOC) PLAN - a written 

document in which the specific procedures for the operation, calibration and 

maintenance of a certified CEMS are described in detail, including additional 

quality assurance assessments and the corrective action svstem. The purpose of 

. this plan is to 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 standards of Rules 2 1 8 and 2 1 8.1. 

(14 U)ROUTINE MAINTENANCE - preventive evaluation and 

repair (if necessary) of CEMS p.erformed at specified intervals to preclude system 

failure, Routine maintenance mav be performed as recommended by the 
Rule 218 (Cont.) Amended May 14,1999 

manufacturer or a documented standard operating procedure determined through 

operating experience and approved by the Executive Officer. Repairs to a 

malfunctioning system are excluded from this 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 

sample from a designated source. 

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-continuouslv determine air 

contaminant and diluent gas concentrations andfor the mass emission rate in a 

source effluent (as applicable) The system consists of three ma-ior 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 integration based technologies, and time-shared CEMS. 

(47 l7) SYSTEM FAILURE 

- inabilitv of the CEMS to meet 

. . 

the requirements of 

-- 

(we~ 

Rule 2 1 8.1, "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 on more than one source. 

(19) WORKING DAY - Monday through Friday excluding, holidays. 

. . /1--b, - 

w =c 'U''f'L~""- 

m:: 

. . 

2 st- ** ' . . 
Rule 218 (Cont.) Amended May 14,1999 

r20) ZERO CHECK- a procedure performed to determine the response of the CEMS to 

a given zero gas standard by means of injecting the zero gas into the CEMS as 

close to the probe tip as practical. 

(21) ZERO GAS - a gas containing less than a specified amount of the air contaminant 

or diluent gas which, when periodically iniected into the CEMS, is used to check 

CEMS' response to the absence of the air contaminant or diluent gas. 

(a bJ Stask Applicabili~ and Monitoring Requirements for New, Modified and Existing 

CEMS 

(1) The provisions of this Rule shall apply to all sources that require CEMS as 

specified in the regulations or permit conditions, with the following exceptions: 

(A) This Rule shall not apply to CEMS subiect 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 CNESHAPS), or Regulation XXXI 

- "Acid Rain Program". 

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

purpose of the CEMS is to monitor the performance of the basic andor 

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 subiect to this Rule 

shall provide, properly install, operate, and maintain in calibration* and good . . working order 0 a certified 

CEMS to measure the concentration andor emission rates, as applicable, of the 

i%dhwag air contaminants and diluent gases, flow rates. and other required . , . . parameter^.^ th The owner or operator 

shall also provide the necessary records and my other data necessary &F 
Rule 218 (Cont.) Amended May 14,1999 

calculatM- air contaminant emission rates or concentrations. as specified in Rule 

2 18. Sections (el and (0. 

. . (b G) Appwd cCf Requirements for New and Modified CEMS and 

SCEMS 

(1) Application and Approval Requirements for New and Modified CEMS 
Rule 218 (Cont.) Amended May 14,1999 

(A) The owner or operator of any equipment subiect to this Rule shall submit to 

the Executive Officer an "Application for CEMS" or "Application for 

CEMS Modification". as applicable. Any application submitted AU . . 

&iJ 

onAr after Ap2 6, ! 979 May 14, 1999, 

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 notifv the applicant in writing within 60 calendar 

days of receipt of an application for a new CEMS. or within 30 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 & 

dv 2n information, plans or 

specifications tz c- 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 -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 ..-..--'..t..'.". CEMS performance pursuant 

to (e)-bkw 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. wha-6 

e. . .. . . dData from such tests 

shall be submitted to the Executive Officer &+qqmw& within 45 days 

following test completion. If satisfactory performance is demonstrated, a 

final approval of the sy%m CEMS shall be granted. Subsequent overation 

and maintenance of the certified CEMS shall be in accordance with the 

provisions of Rule 2 18. Section (cMl MB). After final approval, 
Rule 218 (Cont.) . Amended May 14,1999 

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. 

JB) Upon submission of an "Application for CEMS" or "Application for CEMS 

Modification" as prescribed in Rule 21 8 Section (c)(l)(A), the applicant 

shall indicate either one of the following conditions: 

II) 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 in 

accordance with the provisions of Rule 218. Sections (b), (e), (f) 

and (p) and of the requirements of Rule 2 18.1 (b) and (d), or, . . (11) That the CEMS shall be reviewed and certified according to the 

applicable provisions of the Code of Federal 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 21 8, Sections (b), (e), (f) 

and (a), and the requirements of 40CFR60, Appendix F - "Ouality 

Assurance Procedures" (Appendix F). 

Notwithstanding the requirements of Section (c)(l)(B)(ii), any 

alternative test methods for 40CFR60, Appendices B and F shall be 

those that are listed in Rule 2 18.1. Table 1 - Reference Methods. 

JC) 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 the Executive Officer. 

(2) Application and Approval Requirements for New and Modified SCEMS 

(A) In-lieu of submitting an application for CEMS per Rule 218, Section 

Jc)(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 

- applicable limits(s) for which the CEMS is required is 24 hours or greater; 

or. if the owner or operator demonstrates, to the satisfaction of the 
Rule 218 (Cont.) Amended May 14,1999 

-v Executive Officer, that no CEMS technology is commercially available for 

the applicable contaminant and 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 subiect to this Rule may still elect to 

submit an application for a SCEMS in lieu of a CEMS. subject to the 

following: 

(1) The owner or operator demonstrates that the concentrations and/or 

emissions required to be monitored would be equivalent to that 

monitored by a CEMS for the applicable averaging period, to the 

satisfaction of the Executive Officer; *. Jii) The SCEMS shall be capable to take and record a minimum of one 

measurement (concentration. mass emission rate and/or flow rate, 

as applicable) every 15 minutes allowing as equally spaced data 

points as practical; 

Jiii) The owner or operator shall include in the QNQC plan the method 

of calculating the 15-minute averages for compliance 

determination to the applicable limit or standard; 

Jiv) 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, as applicable) to verify the calculated exeedance; 

(v) If a time shared SCEMS is proposed, it shall meet the performance 

specifications of Rule 2 1 8.1, Section (e); 

JC) The requirements for the application submittal and approval of CEMS as 

provided in Rule 21 8. Section (c)(l) shall also apply for SCEMS 

applications. 

(3) Operation of CEMS or SCEMS During Certification Testing 

CEMS or SCEMS shall be certified as configured 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 Assurance/Quality Control Plan for New or Modified CEMS or SCEMS 

(A) The owner or operator of CEMS or SCEMS who elects the performance 

specifications according to Rule 21 8, Section (c)(l)(B)(i), shall submit to 

the Executive Officer for approval a CEMS ONOC Plan within 45 days 

of CEMS installation and no later than 30 days before the certification 

tests. 
Rule 218 (Cont.) Amended May 14,1999 

JB) 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 

develov alternative CEMS operational test requirements to be included in 

the CEMS QNQC procedures that assure data of equivalent or better 

quality. These alternative QNQC procedures shall be submitted with the 

facility ONOC Plan and are subject to the apvroval of the Executive 

Officer. 

v-= 

< 

4. 

6. 

44% 

Jd) Requirements for Existing CEMS and SCEMS 

(1) Requirements for Existing CEMS 

(A) A CEMS installed and granted final approval before May 14, 1999 shall 

be maintained and operated according to the provisions of Rule 2 18, 

Sections (b), (e), (f) and (a), and the requirements of Rule 21 8.1, Sections 

(c) and (d). 

(B) A CEMS application for initial and final approval submitted to the 

Executive Officer before Mav 14, 1999 shall 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 maintained according to the provisions of Rule 2 18, Sections 
Rule 218 (Cont.) Amended May 14,1999 

Jb), (e), (f) and (a). and the requirements of Rule 21 8.1. Sections (c) and 

0 

JC) Modifications requiring recertification to any existing: CEMS shall be 

reviewed and approved according to the conditions under Rule 2 18 

Section (c)(l)(B)(i) or (ii). as ap~licable. After final approvh. the 

modified CEMS shall be operated and maintained according to the 

conditions under Rule 21 8, Section (c)(l)(B)(i) or (ii), as ap~licable. 

JD) (1) All existing CEMS as prescribed in Rule 2 18, Sections (d)(l)(A) 

and (B) shall comply with the ~rovisions of Rule 2 18.1. Sections 

Jb) and (d), or 40CFR60 Appendices B and F, as auulicable, and of 

Rule 2 18, Sections (b) and (c), no later than May 14.2006. 

Jii) The requirements of Rule 21 8. Section (d)(l)(D)(i) shall be waived 

for a period of three years if the owner or operator demonstrates, to 

the satisfaction of the Executive Officer, that the existing CEMS is 

providing; data that are of a quality commensurate with the original 

performance specifications and other indicators of consistent data 

quality. Data quality factors that will be considered include: 

JI) Relative Accuracy 

(11) Calibration Error 

(111) Calibration Drift 

JIV) Zero Drift 

Valid data return percentage 

JVI) Availability or up-time percentage 

JVII) Breakdown frequency and duration 

JVIII) Excursions beyond quality control limits in OA ~lan. 

The owner or operator may applv for a waiver under this subsection every three years after May 14,2006. This sub-section 

shall not apply to existing CEMS that are required to comply with 

the provisions of Rule 21 8.1, Sections (b) and (d), or, 40 CFR60, 

Appendices B and F. as applicable, and Rule 21 8. Sections (b) and 

Jc), 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 Oualitv Assurance1 Quality Control (OAIQC) Plan no later than 

May 14,2000. The written ONQC Plan shall be kept on record and 

available for inspection upon request by the Executive Officer. 
RuIe 218 (Cont.) Amended May 14,1999 

, - JF) On or before May 14.2005, the owner or operator of any existing CEMS 

shall submit to the Executive Officer for approval: 

(1) A certification signed by an authorized representative of the 

facility that the existing CEMS meets the requirements of Rule 

21 8, Section (c). or, 

Jii) An "Application for CEMS Modification", with the applicable 

fee(s) as specified in Rule 3 0 1, or, 

(iii) An application for waiver according to Rule 2 18. Section 

Jd)(l )(D)(i), with documentation supporting the required 

demonstration; 

(2) Requirements for Existing SCEMS 

(A) A SCEMS installed and granted final approval before May 14. 1999 shall 

be maintained and operated according to the provisions of Rule 2 18, 

Sections (b), (e), (0 and (g), and the requirements of Rule 2 18.1. Sections 

(c) and (d). 

B A SCEMS application for initial and final approval submitted to the 

Executive Officer before May 14,1999 shall be reviewed and approved by 

the Executive Officer according to the specifications and requirements of 

Rule 21 8.1. Sections (c) and (d). After final approval, the SCEMS shall be 

operated and maintained according to the provisions of Rule 2 18. Sections 

(b), (e). (f) and (a), and the requirements of Rule 2 18.1. Sections (c) and 

0 

JC) Modifications requiring recertification to any existing SCEMS shall be 

reviewed and approved according to the conditions under Rule 2 18 

Section (c)(l )(B)(i) or (ii), as applicable. After final approval, the 

modified CEMS shall be operated and maintained according to the 

conditions under Rule 21 8, Section (c)(l)(B)(i) or (ii), as applicable. 

JD) 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 2 18.1 

Section (e) - "Time Sharing; Requirements" and with the provisions of 

Rule 2 18.1 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: 

(1, One or more of the sources monitored requires a new monitoring 

range, 
'lo 

~UUO~!UOLU snonuguo3 aqnbal 01 paypour s! ,!mad auylelado ayL (!I) 
Rule 218 (Cont.) Amended May 14,1999 
Rule 218 (Cont.) Amended May 14,1999 

(Be) Retention of Records for New, Modified and Existing CEMS and SCEMS 

(1) The records of the data obtained from the CEMS recording devices ekke &a& 

. . 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 nC for a minimum period of &east two 

years, unless otherwise specifically provided bv 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 
Rule 218 (Cont.) Amended May 14,1999 

. . test, evaluation, calibration, adjustment and maintenance of the 

CEMS as well as calibration gas traceability e+qxm cz!! sgu~ 

shall be retained by the CEMS operator for a 

minimum period of a&ba& two years unless otherwise specifically provided by 

another District regulation or permit conditions, and shall be made available to the 

Executive Officer upon request. 

(e fJ Reporting Requirements for New, Modified and Existing CEMS and SCEMS 

Unless otherwise specifically provided by another District regulation or permit 

conditions, the following reporting requirements shall auply to new, modified and 

existing CEMS and SCEMS: . . (1) A CEMS owner or operator " shall 

provide a summary of the concentration and/r emission data, as auwlicable, 

obtained from the CEMS, as well as any additional information 

specified by the Executive Officer, to evaluate the accuracy and precision of the 

measurements. The summary shall be submitted mei44y 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 case-by-case 

basis. determines that more frequent reporting is necessary to accurately assess the 

compliance status of the source. The summary report shall be submitted within 30 

days &followinn - the end of the &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 summary& shall be available for 

public inspection at the ~ District. 

. . (2) The CEMS owner or operator p. shall 

report any concentration level andor emission rate, as applicable, in excess of the 

regulated limit ,- within 9Q 24 hours or the next working 

& after such occurrence in the form and manner prescribed by kifft the Executive 

Officer. The report shall include the following information: 

(A) Time intervals, date, and magnitude of the excess concentration level, 

nature and cause of the excess concentration (if known), corrective 

action(& taken, ifRB preventive measure(& adopted, specific location of 

CEMS. the equipment or CEMS involved and the facility contact person. 
Rule 218 (Cont.) Amended May 14,1999 

(B) Agveraging period used for data reporting shall correspond to the 

averaging period specified in the rule or permit condition governing the 

concentration and/or emission rate, if applicable. . . (3) Reports of CEMS Failure or Shutdown 

(A) The CEMS owner or operator a 

shall notify the Executive Officer within 94 24 hours or the next working 

&, ;- 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 of Rule 218, Section (b) is waived 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 aHearing Board approval of an 

alternative operating condition following the established procedure in 

District Rule 5 18.2 - Federal Alternative Operating Condition. . . (Fa Regularly scheduled CEMS maintenance- shall 

be deferred until the report required under Rule 218, ssection (e f)o is 

made, if the system is measuring a concentration equal to or exceeding the 

emission standard, and if such deferral is not reasonably expected to result 

in damage to the system. 

( H~Continuous emission monitoring requirements shall 

not apply during @ Regular calibration 

checks of the system,* or Routine maintenance and repair e# lasting 60 

minutes or less*. 

0 - 

Cg) Posting of Written Approval for New, Modified and Existing CEMS and SCEMS 

The CEMS owner or operator of an approved CEMS mei&wkg 

sptem shall affix & a written notice of approval or a legible facsimile thereof, upon 
Rule 218 (Cont.) Amended May 14,1999 

the equipment or within 26 feet of the equi~ment as prescribed in District Rule 206, in a 

manner such that it is clearly visible, & legible, and safelv accessible. In the event that 

the equipment is se constructed or operated that the notice of approval or its legible 

facsimile cannot be so placed, such notice or legible facsimile shall be mounted on a 

location approved by the Executive Officer.