( Adopted : 04/07/89; Amended : 02/01/91; Amended : 02/01/91; Amended : 07/19/91; Amended : 08/02/91; Amended : 12/04/92; Amended : 12/10/93; Amended : 04/11/97; Amended : mm/dd/yy)

AVAQMD Rule 431.1 431.1-1
Sulfur Content of Gaseous Fuels D1b: 03/29/12 

## RULE 431.1

Sulfur Content Of of Gaseous Fuels

( a A) General

(1 ) Purpose

(a) The purpose of this rule is to reduce sulfur oxides (SO x ) emissions from the burning of gaseous fuels in stationary equipment requiring a permit to operate by the South Coa st Air Quality Management District (District).

. (2) Applicability

(a) The provisions of this rule shall apply to any burning, transferring, selling or the offering for sale of any gaseous fuels containing s ulfur compounds in excess of 16 parts per million by volume (ppmv), calculated a s hydrogen sulfide (H2S), in stationary equipment requiring a Permit to Operate (PTO) by the Antelope Valley Air Quality Management District (District). [Derived from SCAQMD Rule 431.1 (b) ]



### (B) Definitions

(1) BURN means to “Air Pollution Control Officer” (APCO) – The person appointed to the position of Air Pollution Control Officer of the Di strict pursuant to the provisions of California Health & Safety Code §40750, and his or her designee. [Derived from AVAQMD Rule 1301(G)]

(2) “Authority to Construct Permit” (ATC) – A Distr ict permit required pursuant to the provisions of District Rule 201 which must be obtai ned prior to the building, erecting, installation, alteration or replacement of any Perm it Unit. Such permit may act as a temporary PTO pursuant to the provisions of Distric t Rule 202. [Derived from AVAQMD Rule 1301(K)]

(3) Burn – To combust any gaseous fuel, whether for useful heat o r by incineration without heat recovery, except for flaring of emergency vent gases.431.1-2 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 ( 2) CONTINUOUS EMISSION MONITORING SYSTEM (CEMS) is a 4) “California Air Resources Board” (CARB) – The California State Air Resources Board the powers and duties of which are described in Part 2 of Divi sion 26 of the California Health & Safety Code (commencing with section 39500). [Derived from AVAQMD Rule 1301(P)]

(5) Continuous Emission Monitoring System (CEMS) – A system of equipment that continuously measures and records all parameters ne cessary to directly determine concentrations and/or mass emissions of selected po llutants, and which meets all of the requirements of Attachment A, Section II.

( 3) CONTINUOUS FUEL GAS MONITORING SYSTEM 6) Continuous Fuel Gas Monitoring System” (CFGMS) is a – A system of equipment that continuously measures and records total sulfur concentration in the gaseous fuel prior to burning, and which meets all the requirements of Attachment A, S ection I.

( 4) DAILY AVERAGE is an 7) “Continuous Monitor” – a CEMS or CFGMS. [Derived from SCAQMD Rule 431.1(c)(4)]

(8) Daily Average – An arithmetic mean of all the of a facility’s sulfur compounds readings within a calendar day obtained according to the gui deline specified in Attachment A.

(5) EMERGENCY VENT GAS is any (9) “District” – The Antelope Valley Air Quality Management District, the geographical area of which is described in District Rule 103. [Derived from AVAQMD Rule 1301(X)]

(10) Emergency Vent Gas – Any gas released from a process unit as a result of an y process upset or breakdown.

( 6) GASEOUS FUEL is any 11) Gaseous Fuel – Any gaseous material which releases heat when burned including, but not limited to, any natu ral, refinery, field produced, process, synthetic, landfill, sewage digester, or waste gase s with a gross heating value of 2670 kilocalories per cubic meter (300 BTU per cubic foo t) or higher, at standard conditions.

( 7) LANDFILL GAS is any 12) Landfill Gas – Any gas derived through any biological process from the decomposition of organic waste bur ied within a waste disposal site.

( 8) MONTHLY WEIGHTED AVERAGE SULFUR CONTENT is the 13) Monthly Weighted Average Sulfur Content – The result of the summation of average daily sulfur contents of the fuel(s) consumed multiplied by the average daily consumption rates of the fuel(s) consumed in any month divided by the to tal gaseous fuel consumption rate for that month.

( 9) NATURAL GAS is a 14) Natural Gas – A mixture of gaseous hydrocarbons, with at least 80 percent methane (by volume), and of pipeli ne quality, such as the gas sold orAVAQMD Rule 431.1 431.1-3

Sulfur Content of Gaseous Fuels D1b: 03/29/12 distributed by any utility company regulated by the California Public Utilities

Commission.

( 10) RECLAIM SO x FACILITY is a facility that has been included in t he RECLAIM (Regional Clean Air Incentives Market) 15) “Permit to Operate” (PTO) – A District permit required pursuant to the provisions of Distr ict Rule 203 which must be obtained prior to operation of a Permit Unit. An ATC may fun ction as a temporary PTO pursuant to the provisions of District Rule 202. [Derived from AVAQMD Rule 1301(BBB)]

[Deleted-SCAQMD legacy program in accordance with the requirements of Rule 2001 "Applicability", and/or which has been issued a REC LAIM Facility Permit and is subject to the requirements of Rule 2011, "Requirem ents for Monitoring, Reporting, recinded from AVAQMD by its removal from AVAQMD Rul es and Recordkeeping for Oxide s of Sulfur (SO x ) Emissions".

(11) REFINERY GAS is any Regulations] (16) Refinery Gas – Any combustible gaseous by-product generated from a petroleum refinery proc ess unit operation, with a gross heating value of 2670 kilocalories per cubic meter (300 BTU per cubic foot) or higher, at standard conditions.

(12) SEWAGE DIGESTER GAS is any (17) Sewage Digester Gas – Any gas derived from anaerobic decomposition of organic sewage with in its containment.

( 13) SMALL REFINER means any person owning or operating a fac ility in California that produces materials from processing of petroleum cru de provided such facility: 18) “South Coast Air Quality Management District” – Th e air quality district created pursuant to Division 26, Part 3, Chapter 5.5 of the California Health & Safety Code (commencing with §40400). [Derived from AVAQMD Rule 1124.]

(A) has and at (18) [Deleted-Consolidated all times had since January 1, 1978, a crude oil capacity of not more than 55,000 barrels per stream day; and

(B) has not been, at any tim e since September 1, 1988, owned or controlled by a ny refiner that at the same time owned or controlled r efineries in California with a total combined crude oil capacity of more than 55,000 bar rels per stream day; and

(C) has not been at any time since Se ptember 1, 1988, owned or controlled by any refiner that at the same time owned or controlled r efineries in the United States with a total combined crude oil capacity of more than 137, 500 barrels per stream day; and

(D) has received a two

- year extension f or refinery gas due to expiration of extra compliance with California Air Resources Board's Phase II Refo rmulated Gasoline Requirements. time]431.1-4 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 (14) STANDARD CONDITIONS is the (19) Standard Conditions – The atmospheric state where the temperature is 60 o ° F and barometric pressure is 14.7 pounds per square inch absolute.

(15) STREAM DAY is any (20) Stream Day – Any day or part of a day when a facility or a process unit is in operation.

(21) “United States Environmental Protection Agency ” (USEPA) - The United States Environmental Protection Agency, the Administrator of the USEPA and his or her authorized representative. [Derived from AVAQMD Rule 1301(YYY)]



### ( c) Sulfur Content C) Requirements

(1) Natural gas

A person shall not sell or offer for sale for use i n the jurisdiction covered by of the District natural gas containing sulfur compound s , calculated as H 2 S, in excess of 16 parts per million by volume (ppmv) calculated as hydrogen sulfide

.

[Deleted- Provision expired by its own terms] (2) Small Refiners Refiner y gas
Anytime prior to May 4, 1996, a small refiner shall not:

(A) sell any refinery gas containing sulfur compounds i n excess of 80 ppmv calculated as hydrogen sulfide, or

(B) burn or discharge to any fuel gas system or vent ga s disposal system, refine ry gas containing sulfur compounds in excess of 800 ppmv c alculated as hydrogen sulfide, unless sulfur compounds in the stack gases are reduced to a level below that which would be emitted when using a fuel which complies with the requirements of this para graph.

For purposes of this paragraph, the 80 or 800 ppmv limit shall apply to any gaseous fuel vented from a process unit or, if applicable, as ve nted from a sulfur removal unit. On or after May 4, 1996, the applicable sulfur compounds content limit for small refiners refinery gas shall be as specified in paragraph (c) (3) of this rule. (3) Other Gaseous Fuels

On or after the applicable compliance dates specifi ed in Table 1, a A person shall not burn in equipment requiring a PTO , purchase, transfer, sell or offer for sale for use in the jurisdiction of the District, any gaseous fu el containing sulfur compounds

, calculated as ppmv hydrogen sulfide asH 2 S , in excess of the concentration limits as measured over the averaging periods for various gas eous fuels as specified in Table 1. [Derived from SCAQMD Rule 431.1(d]AVAQMD Rule 431.1 431.1-5

Sulfur Content of Gaseous Fuels D1b: 03/29/12 TABLE 1 Fuel Type Sulfur Limits
ppmv Averaging Period s Compliance Date On or After Refinery Gas 40 4 hrs Small Refiners 40 4 hrs May 4, 1996

Other Refiners 40 4 hrs May 4, 1994 Landfill Gas 150 Daily November 17, 1995
40 or Daily or July 1, 1997 40 and 200 Monthly and15

-

minutes July 1, 1997

Sewage Digester Gas 40 or 250 Daily or November 17, 1995

Sewage Digester Gas 40 and 500 or Monthly and 15

- minutes Daily or November 17, 1995

Other Gases 40 and 500 4 hrs Monthly and 15-minutes May 4, 1994

(A) Landfill gas and sewage digester gas

(i) A person who complies through monthly averaging shall install and properly operate a continuous monitor that complies Other Gases 40 4 hrs

[Deleted column with the requirements specified in subdivision (d) of th is rule. Compliance

shall be determined based on readings obtained from the approved CFGMS or as calculated from the approved CEMS readi ng.
(B) Optional Facility Compliance Plan ("OF CP")431.1-6 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 A person may comply with paragraph (c)(3) by achiev ing equivalent sulfur oxides (SO x ) emission reductions within the facility, provided that the applicant submits and complies with an Optional Facility Comp liance Plan ("OFCP") which has been approved in writing by the Executive Officer or designee. The OFCP shall:

(i) Contain, at a minimum, all data, records, and other information necessary to determine eligibility for alternative emission c ontrol, including but not limited to: (I) A list of equipm ent and a description of the equipment where the gaseous fuel is being produced and/or burned; (II) Amount of fuel produced by and/or to be burned in e ach of the equipment listed above; (III) The estimated emission of sulfur dioxide from each equipment; and (IV) Historical and projected information on fuel usage;

(ii) Demonstrate that daily total SO x emissions under the OFCP from all sources within the facility regulated under Rule 43 1.1 would be less than or equal to SO x emissions that would have been emitted based on actual total SO x emissions from each source, or the sulfur content l imits of this rule, whichever results in lower SO x emissions. The total SO x emissions generated from the subject fuel shall be determined using a continuous emission moni toring system (CEMS) specified in subdivision (d). The total emi ssions may be determined by monitoring the sulfur dioxide emissions from at lea st 70 percent of the total fuel gas consumed as obtained from a totalizing meter, a nd calculating the total emis sions using the CEMS data; (iii) Demonstrate that the permit units subject to the sp ecified rule emission limitations are in expired compliance with all applicable District rules or are on an approved schedule of compliance; and dates] (iv) Demonstrate tha t continuous monitoring requirements of SO x emissions specified in subdivision (d) of this rule are compl ied with. (4) [“OFCP” provision eliminated because in its present form did not conform to USEPAs economic incentive program (EIP). There are currently no fa cilities in the District opting to use an OFCP as a means to comply with the emission limits of Rule 43 1.1.] (3) Previously Exempt or Previously Compliant Facilities A person burning gaseous fuel containing sulfur com pounds in excess of the

limits specified in Table 1 and whose facility had been previously exempt from this rule pursuant to paragraph (g)(8 subsection (G)(6 ); or any person who, without the use of any sulfur removal or control system, had been previous ly in compliance with the limits specified in Table 1, shall:AVAQMD Rule 431.1 431.1-7

Sulfur Content of Gaseous Fuels D1b: 03/29/12 (A) submit (a) Submit for approval by the Executive Officer or

designee APCO within 30 days from the time of exceedance or non- compliance, a plan to demonstrate compliance with the requireme nts of the rule;

(B) submit (b) Submit to the Executive Officer or designee APCO an application for a fuel gas control system within si x months of the time of exceedance of the exemption criteria specified in paragraph (g)(8 subsection (G)(6 ), or non-compliance with the limit;

(C) demonstrate (c) Demonstrate compliance with the limit specified in Table 1 no later than eighteen ( 18 ) months after the time of exceedance , or by July 1, 1997, whichever is later ; and

(D) comply with paragraph (d)(3).



### (d (d) Comply with subsections (D)(1)and (D)(2), or (D )(3).

(D 

### ) Monitoring Requirements (1) A person burning landfill gas or sewage digester ga s Except as provided in subsection (D)(3), a person burning gaseous fuels, other than exclusively natural gas, in stationary equipment requiring a permit to operat e PTO by the District shall install and have a properly operate a operating continuous fuel gas monitoring system (CFGMS) to determine the sulfur content , calculated as H 2 S, of the fuel gas prior to burning, or a continuous emission monitoring system (CEMS) to det ermine SO x emissions after burning. Such All continuous monitor monitors, require District approval, which shall be approved according to based on the requirements as set forth specified in Attachment A. An alternative method that ensures adequate com pliance with the daily total sulfur content limitation of paragraphs (c)(1), (2) and (3 ) of this rule may be used upon written approval by the Executive Officers of the District, the California Air Resources Board (CARB), and the Regional Administrator of the Environmental Protection Agency (EPA), Region IX, or their designees. At a minimum , the alternative method shall meet the specifications of Attachment A, Section III.

Prior to the final compliance date specified for la ndfill gas in Table 1, ( a perso n burning landfill gas may comply with the monitoring require ments specified in this paragraph, if data regarding total sulfur content of the landfill gas is contained and submitted to the District in a Rule 1150.1 plan. (2 ) A person burning gaseous fuels other than natural gas, landfill gas, or sewage dig ester gas in stationary equipment requiring a District pe rmit to operate shall install and properly operate a the CFGMS to determine the total sulfur content upstream of any mixing of the gaseous fuel prior to burning, or a CEMS to determine the sulfur oxid es431.1-8 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 (SOx) emissions after burning according to the appl icable requirements set forth in Attachment A. A person shall not mix refinery gases with natural gas, propane or other fuels upstream of the monitori ng device

. ( 3) b) A person subject to (c)(4) subsection (C)(3) of this rule who burns gaseous fuels containing sulfur compounds in excess of the limits specified in Table 1

, shall install comply with subsections (D)(1) and properly operate a CFGMS to determin e the sulfur content in the fuel gas prior to combu stion, or CEMS to determine the sulfur oxide emissions after burning, within (D)(2) no later than twelve months from after the date a Permit to Construct a sulfur removal system an ATC is issued . Such moni tor shall be approved according to the requirements of Attachment A, or an alternative met hod may be used upon approval by the Executive Officers of the District and CARB, and the Regional Administrator of the EPA, Region IX, or their desig nees for a sulfur removal system or comply with subsection (D)(3)

. ( 4 c) Compliance with the Table 1 sulfur limits shall be determined based on readings obtained from an approved Continuous Monitor.

[Moved to section (D)(1)] [Moved to section (D)(1)] [Moved to section (D)(1)] (2 ) A person installing a continuous monitor Continuous Monitor shall submit to the District for approval, a quality assurance procedure as specified in US EPA 40 CFR Part 60, Appendix F, Procedure 1 for CEMS and, as applicable , for CFGMS.

( A a ) The quality assurance procedure specified above s hall be approved in writing by the Executive Officer or designee before submitted to the District for written approval by the APCO prior to the CFGMS or CEMS final certification.

( B b ) Any CFGMS or CEMS deemed to be out of control, as specified in Attachment A, according to the facility quality assurance proc edure approved by the Executive Officer or designee APCO shall be corrected within 72 hours , as demonstrated by meeting the performance specificati on for which it wa s deemed out of control

. (i) The person operating the CFGMS or CEMS shall no tify the Executive Officer or designee APCO by telephone or facsimile of any breakdown(s) of the monitoring systems if the duration of the br eakdown is in excess of 60 minutes or if there are three (3) or more breakdowns in any one day within 24 hours of the occurrence of the breakdown which triggers notification. Such report shall identify the time, location, equipment involved, and contact person. (ii) The person shall keep a reco rd of any breakdown of the monitors and shall maintain such record for at least two years, and make it available to the District staff upon request.AVAQMD Rule 431.1 431.1-9

Sulfur Content of Gaseous Fuels D1b: 03/29/12 (iii) The person who complies with the provisions of clauses (d)(4)(B)(i) and (ii subsection (D)(2)(b)(i) and subsection (E) (3 ) shall not be considered in violation of this rule for the 72 hour period of breakdown provided that the breakdown did not result from operator err or, neglect or improper operation or maintenance procedures

. (3) A person burning landfill gas or sewage digeste r gas, or who is subject to subsection (C)(3) of this rule may use an alternative monitori ng method, in lieu of the requirements in subsections (D)(1) and (D)(2), that ensures comp liance with the daily total sulfur content limitation as specified in Table 1. Altern ative monitoring methods shall not be used unless first approved in writing by the APCO, the California Air Resources Board (CARB), and the Regional Administrator of the Envir onmental Protection Agency (EPA), Region IX, or their designees.

(a) At a minimum, the alternative monitoring method shall meet the guidelines of Attachment A, Section III.

(b) A person subject to subsection (C)(3) of this r ule shall submit an alternative monitoring method for approval no later than 45 day s after the date an ATC for a sulfur removal system is issued.

(c) All monitoring must comply with the approved al ternative monitoring method.

(d) District personnel shall use the approved alter native monitoring method to determine compliance with the limits of this rule. [Derived from SCAQMD Rule 431.1 (e) (1 through 3)]

(E) 

### Reporting and Recordkeeping Requirements (1) All records required by this rule shall be maintain ed at the facility for at least five (5) years, and be made available to District staff upon request.

(2) Except at electric utility generating facilities an d refineries, a person burning gaseous fuel

, other than exclusively natural gas

, in stationary equipment requiring a District permit to operate PTO , shall submit to the Executive Offic er or designee APCO annual reports of the monthly fuel consumption and the tot al sulfur content of the fuel consumed. Such The annual report shall be submitted no later than 60 days following the end of the reporting year, and shall consist of the amount of any gaseous fuel consumed monthly, the applicable hourly, daily or monthly average sulfur content as determined by the device Continuous Monitor or approved alternative monitori ng method as specified in paragraph (d subsections (D )(1), ( d D )(2), or ( d D )(3) of this rule, and total SO x emissions , calculated as SO 2
. ( 2) 3) A person burning gaseous fuel in stationary equipm ent located at electric utility generating facilities or refineries shall submit to the Executive Officer or designee APCO monthly reports of the daily fuel consumption, the monthly weighted431.1-10 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 average sulfur content (except for natural gas), an d the maximum four ( 4 ) -hour average sulfur content of the fuel consumed, as determined by the device specified in paragraph (d subsection (D )(2) of this rule and the total SO x emissions , calculated as SO 2 . The report shall be submitted within no later than 30 days following the end of the reporting month.

(3) The information specified in paragraphs (e)(1) and (e)(2) shall be maintained at the facility for at le ast two years, and be made available to the Distric t staff upon request.

(4) The person operating a continuous monitor shall keep records as specified in clause (D)(2)(b)(i) for monitor breakdown (s) [Derived from SCAQMD Rule 431.1 (f) (1 through 4)]



### (F) Test Methods

The following may be used by the Executive Officer or designee APCO to verify compliance with the provisions of this rule:

(1) For determination of compliance with sulfur con tent requirements of subdivision (c section (C ):

(A (a ) The reference method for determining the concentr ation of sulfur compounds in a gaseous fuel, calculated as hydrogen sulfide, shall be District H 2 S, shall be South Coast Air Quality Management District (SCAQMD) Method 307-91 - Determination of Sulfur in a Gaseous Matrix, or any other method demonstrat ed by the applicant to be equivalent and approved in writing by the Executive Officers of the District APCO , the CARB, and the Regional Administrator of the EPA, Re gion IX, or their designees, or

(B (b ) Data obtained from a continuous monitor, which is required to be installed and properly operated according to subdivision (d section (D ) and as approved by the Executive Officer or designee APCO pursuant to the guidelines requirements specified in Attachment A.

(2) The gross heating value of gaseous fuels shall be determined by ASTM Method D 3588- 91 or, if applicable, ASTM Method D 4891-89.

(3) The methane content of gaseous fuels shall be d etermined by ASTM Method D 1945- 81.AVAQMD Rule 431.1 431.1-11

Sulfur Content of Gaseous Fuels D1b: 03/29/12 (g (G 

### ) Exemptions Unless otherwise specified, and provided that the p erson seeking the exemption supplies proof and verification upon request of applicable criteri a to the satisfaction of the Executive Officer or designee APCO , the provisions of this rule shall not apply to th e following cases :
(1) A person selling, for use in the jurisdiction o f the District, any gaseous fuel not complying with paragraphs (c) subsections (C) (1) through (c and (C )(3) provided that:

( A a ) The gaseous fuel is delivered directly to a sulfu r removal unit which is in full operation and which reduces the sulfur content to t he limits specified in paragraphs (c subsections (C )(1) through (c and (C )(3); and

( B b ) The seller notifies the Executive Officer or designee APCO prior to any such sale of the quantity, heating value, and composition of the gaseous fuel to be sold; and

( C) c) The buyer has an approved Permit to Construct ATC and/or Operate PTO for the sulfur removal unit that will be used to treat the purchased gas.

(2) Gaseous fuels containing sulfur used in the pro duction of sulfur or sulfur compounds.

(3) Waste gases being burned provided that:

( A a ) The gross heating value of such gases is less tha n 2670 kilocalories per cubic meter (300 British Thermal Units per cubic foot) at standard conditions; and

( B b ) Any supplemental fuel used to burn such waste gas es does not contain sulfur or sulfur compounds in excess of the amount specified in this rule.

(4) Gases being burned from fluidized catalytic crackin g unit (FCCU) regenerators subject to District [ Deleted- Rule 1105 or and Regulation XX. rescinded]

(5) Gases vented during refinery turnaround pursuant to District [Deleted- Rule 1123

or and Regulation XX. rescinded]

( 6 4 ) Gases vented to a control system pursuant to Dist rict Rule1173 .[Deleted- Rule 466 and 1173 or Regulation XX. rescinded]

( 7 5 ) Gases vented intermittently to fuel gas or waste disposal system from pressure control valves, sight glasses, compressor bottles, sampling systems, and pump and compressor
case vents.

( 8 6 ) Any facility which emits less than five ( 5 ) pounds per day total sulfur compounds, calculated as hydrogen sulfide H 2 S , from the burning of gaseous fuels other than natu ral gas. Emissions of total sulfur compounds shall be measured based on fuel analysis, using the test method specified in paragraph (f subsection (F )(1), and the maximum daily431.1-12 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 gaseous fuel consumption. This exemption shall not apply to the requirement of paragraph (c subsection (C )(1).

( 9 7 ) A person is exempt from the requirements of paragraph (d subsection (D )(1) and (d)(2) if the person demonstrates to the satisfaction of the Executive Officer or designee APCO that the supplier of the gaseous fuel has complied with the requirements of subdivision (d section (D ) for such fuel.

(10) Until November 17, 1997, any gaseous fuel sold or p urchased in a transaction bet ween a RECLAIM SO x facility and a Non

- RECLAIM SOx facility is exempt from the sulfur content requirements specified in paragraphs (c)(1) , (2) and (3), provided that:

(A) both the buyer and seller of the gaseous fuel submi t to the Executive Officer or desig nee monthly written report of the quantities and da ily averages of the total sulfur contents of the gaseous fuel sold to the buy er or purchased from the seller. The daily average of total sulfur contents of gase ous fuels shall be monitored and reported to the District in a manner and format specified by t he Executive Officer or designee. Such report shall be submitte d within 30 calendar days following the end of the reporting month; and

(B) the RECLAIM SO x facility reports to the District and includes all SO x emissions generated from the burning of such gaseous fuel, as part of the facility's total SO x emissions pursuant to Rule 2004. (11 () [Deleted-RECLAIM program recinded from District Rul es and Regulations]

(8 ) On or after July 1, 1997, a person previously in compliance with the limits specified in Table 1 of this rule shall be exempt from the requi rements of paragraph (c subsection (C )( 4 3 ) provided that: the alternative monitoring method pursuant to paragraph (d section (D ) yields no more than three individual readings in a calendar year in excess of the limits specified in Table 1; that no single reading exceeds a fuel sulfur limit of 50
ppm by 25 percent ; and that the sampling frequency is no longer than once per week. [Derived from SCAQMD Rule 431.1(h)(11)]

See SIP Table at http://www.avaqmd.ca.gov/Modules/S howDocument.aspx?documentid=921

[SIP: Submitted as amended 11/17/95 on 1/31/96; S ubmitted as amended 10/2/92 on 1/11/93; Submitted as amended 5/4/90 on 12/31/90; Approved 10/19/84, 49 FR 41028 , 40 CFR 52.220(c)(137)(vii)(B); Approved _______, ______, 40 CFR 52.220(c)(125)(ii)(A); approved 9/28/81, 46 FR 47451, 40 CFR 52.220(c)(65)(ii)]AVAQMD Rule 431.1 431.1-13

Sulfur Content of Gaseous Fuels D1b: 03/29/12 

### ATTACHMENT A

SECTION I

- REQUIREMENTS FOR CONTINUOUS FUEL GAS MONITORING SYSTEM (CFGMS)

A continuous fuel gas monitor used for determining the sulfur content of any gaseous fuel shall:

(1) Continuously monitor and record the concentrati on by volume (dry basis) of sulfur compounds in ppmv as H 2 S in the gaseous fuel. (2) Have the span value of the monitor set so that all readings fall between 20 and 95 percent of scale. (3) Check for calibration drift of the monitoring s ystem at least once daily (approximately 24-hr interval) at two concentrations, one high level and one low level. Whenever the daily high level or low level calibration drift exceeds 5% of analyz er full scale span, the monitoring system shall be deemed to be out of control and subject to the requirements of subparagraph (d subsection (D )(4)( B b ) of this rule. (4) Determine the relative accuracy of the monitor which shall be no greater than 20 percent of the mean value of the reference method test data. (5) Be able to record negative values of zero drift

. (6) Report the concentration of the sulfur compound s calculated as hydrogen sulfide H 2 S

.

SECTION II

- REQUIREMENTS FOR CONTINUOUS EMISSIONS MONITORING SYSTEMS (CEMS)

A stack CEMS used for monitoring the sulfur dioxide emissions from the burning of any gaseous fuel shall:

(1) Continuously monitor and record the concentrati on by volume (dry basis, zero percent excess air) of sulfur compounds in ppmv as SO 2 emitted into the atmosphere; (2) Include either an oxygen monitor for correcting the data for excess air or a fuel gas and exhaust gas flowmeter for the determination of mass emissio ns; (3) Have the span value of all the monitors set so that all readings fall between 20 and 95 percent, for four-hour and daily averages, and between 10 an d 95 percent, for monthly averages, of full scale; (4) When using an oxygen monitor for the correction of excess air, be able to measure a sulfur compound concentration emission limit of 5 ppm (dry basis, zero percent excess air), which is stoichiometrically equivalent to the limit of sulfu r compound content of 40 ppm calculated as hydrogen sulfide in the gaseous fuels; (5) Use District Methods 100.1 or 6.1 (as applicabl e for sulfur compound analysis) and District SCAQMD Method 3.1 (for oxygen content analysis), or District SCAQMD Method 2.1431.1-14 AVAQMD Rule 431.1 Sulfur Content of Gaseous Fuels

D1b: 03/29/12 (for flowrate determination), whichever is applicab le, or any other methods demonstrated by the applicant to be equivalent and approved in writing by the Executive Officers of the District APCO and the CARB, and the Regional Administrator of th e EPA, Region IX, or their designees, for conducting the relative accuracy eva luations. The relative accuracy limit shall be 1 ppm and zero drift (2-hour and 24-hour) and calib ration drift (2-hour and 24-hour) limits for sulfur compounds monitor shall be 5 percent of the span range; and (6) Check for calibration drift of the monitoring s ystem at least once daily (approximately 24-hr interval) at two concentrations, one high level and one low level. Whenever the daily high level or low level calibration drift exceeds 5% of analyz er full scale span, the monitoring system shall be deemed to be out of control and subject to the requirements of subparagraph (d subsection (D )(4)( B b ) of this rule. (7) Facilities burning fuel gas subject to this rul e shall comply with the requirements of Rule 218 and 218.1(proposed) except where specific requirements have been incorp orated into this rule.

SECTION III

- – GUIDELINES FOR APPROVAL OF ALTERNATIVE MONITORING PLAN

BY THE EXECUTIVE OFFICER APCO

In lieu of a continuous fuel gas monitoring system (CFGMS) or a continuous emission monitoring system (CEMS), a person subject to this rule may su bmit an alternative monitoring plan to the Executive Officer or designee APCO, the California Air Resources Board (CARB), an d the Regional Administrator of the Environmental Protection Agenc y (EPA), Region IX, or their designees. for his their review and decision. Submittal of such a plan must be at least 180 days prior to the applicable compliance date set forth in Table 1. The Executiv e Officer or designee shall approve or disapprove o f such plan no later than 90 days pr ior to the applicable compliance date set forth in Table 1 based upon whether the alternative monitoring plan includes al l of the following:

(1) A test program to determine the correlation bet ween hydrogen sulfide H 2 S and total sulfur in the fuel gas using District SCAQMD Method 307-91. If a correlation is established, a colorimetric test, or other alternative method approved by the Executive Officer or designee APCO as being equivalent or better in establishing such correlati on, may be conducted regularly to determine total sulfur using hydrogen sulfide H 2 S as a surrogate. (2) An error analysis between colorimetric, or othe r approved alternative method readings and the total reduced sulfur analysis obtained from District SCAQMD Method 307-91. To demonstrate equivalency between the two methods of analyses, th e relative accuracy shall not exceed 20 percent of average District SCAQMD Method 307-91 readings. (3) A schedule for a daily or more frequent analysi s of the fuel gas for hydrogen sulfide ( H 2 S ) using the colorimetric test, or other approved alte rnative method, and a minimum weekly analysis of the fuel gas using District SCAQMD Method 307-91. A different frequency of analysis may be used if the Executive Officer or designee APCO determines that such frequency is adequate to will ensure compliance with the daily total sulfur limi ts of this rule.AVAQMD Rule 431.1 431.1-15

Sulfur Content of Gaseous Fuels D1b: 03/29/12 (4) When the sulfur level is suspected to be at or above the 40 ppmv level sulfur content requirements of Table 1 as determined by the colorimetric or other alterna tive method, a procedure to obtain at minimum a daily sample to be tested according to District SCAQMD Method 307-91 until three consecutive daily samples show that total sulfur is below the 40 ppmv limit sulfur content requirements of Table 1

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