1110.2 - 1

(Adopted August 3, 1990)(Amended September 7, 1990)(Amended August 12, 1994)

(Amended December 9, 1994)(Amended November 14, 1997)

(Amended June 3, 2005)(Amended February 1, 2008)

RULE 1110.2 EMISSIONS FROM GASEOUS- AND LIQUID-FUELED 

ENGINES

(a) Purpose

The purpose of Rule 1110.2 is to reduce Oxides of Nitrogen (NOx), Volatile Organic 

Compounds (VOCs), and Carbon Monoxide (CO) from engines.

(b) Applicability

All stationary and portable engines over 50 rated brake horsepower (bhp) are subject 

to this rule.

(c) Definitions

For the purpose of this rule, the following definitions shall apply:

(1) AGRICULTURAL STATIONARY ENGINE is a non-portable engine used 

for the growing and harvesting of crops or the raising of fowl or animals for the 

primary purpose of making a profit, providing a livelihood, or conducting

agricultural research or instruction by an educational institution. An engine used 

for the processing or distribution of crops or fowl or animals is not an

agricultural engine.

(2) APPROVED EMISSION CONTROL PLAN is a control plan, submitted on 

or before December 31, 1992, and approved by the Executive Officer prior to 

November 14, 1997, that was required by subdivision (d) of this rule as 

amended September 7, 1990.

(3) CERTIFIED SPARK-IGNITION ENGINES mean engines certified by

California Air Resources Board (CARB) to meet emission standards in

accordance with Title 13, Chapter 9, Article 4.5 of the California Code of 

Regulations (CCR).

(4) EMERGENCY STANDBY ENGINE is an engine which operates as a

temporary replacement for primary mechanical or electrical power during

periods of fuel or energy shortage or while the primary power supply is under 

repair.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 2

(5) ENGINE is any spark- or compression-ignited internal combustion engine, 

including engines used for control of VOCs, but not including engines used for 

self-propulsion.

(6) EXEMPT COMPOUNDS are defined in District Rule 102 - Definition of 

Terms.

(7) FACILITY means any source or group of sources or other air contaminant 

emitting activities which are located on one or more contiguous properties within 

the District, in actual physical contact or separated solely by a public roadway 

or other public right-of-way, and are owned or operated by the same person 

(or by persons under common control), or an outer continental shelf (OCS) 

source as determined in Section 55.2 of Title 40, Part 55 of the Code of

Federal Regulations (40 CFR Part 55). Such above-described groups, if

noncontiguous, but connected only by land carrying a pipeline, shall not be 

considered one facility. Sources or installations involved in crude oil and gas 

production in Southern California Coastal or OCS Waters and transport of 

such crude oil and gas in Southern California Coastal or OCS Waters shall be 

included in the same facility which is under the same ownership or use

entitlement as the crude oil and gas production facility on-shore.

(8) LEAN-BURN ENGINE means an engine that operates with high levels of 

excess air and an exhaust oxygen concentration of greater than 4 percent.

(9) LOCATION means any single site at a building, structure, facility, or

installation. For the purpose of this definition, a site is a space occupied or to 

be occupied by an engine. For engines which are brought to a facility to 

perform maintenance on equipment at its permanent or ordinary location, each 

maintenance site shall be a separate location.

(10) NET ELECTRICAL ENERGY means the electrical energy produced by a 

generator, less the electrical energy consumed by any auxiliary equipment

necessary to operate the engine generator and, if applicable, any heat recovery 

equipment, such as heat exchangers.

(11) NON-ROAD ENGINE is any engine, defined under 40 CFR Part 89, that

does not remain or will not remain at a location for more than 12 consecutive 

months, or a shorter period of time where such period is representative of 

normal annual source operation at a stationary source that resides at a fixed 

location for more than 12 months (e.g., seasonal operations such as canning 

facilities), and meets one of the following:
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 3

(A) Is used in or on a piece of equipment that is self-propelled or serves a 

dual purpose by both propelling itself and performing another function 

(such as a mobile crane); or

(B) Is used in or on a piece of equipment that is intended to be propelled 

while performing its function (such as lawn mowers and string trimmers); 

or

(C) By itself, or in or on a piece of equipment, is portable or transportable, 

meaning designed to be and capable of being carried or moved from 

one location to another. Transportability includes, but is not limited to, 

wheels, skids, carrying handles, dolly, trailer, platform or mounting.

(12) OPERATING CYCLE means a period oftime within which a round of 

regularly recurring events is completed, and cannot be stopped without the risk 

of endangering public safety or health, causing material damage to the 

equipment or product, or cannot be stopped due to technical constraints. 

Economic reasons alone will not be sufficient to extend this time period. The 

operating cycle includes batch processes that may start and finish several times 

within a twenty-four hour period, in which case each start to finish interval is 

considered a complete cycle.

(13) OXIDES OF NITROGEN (NOx) means nitric oxide and nitrogen dioxide.

(14) PORTABLE ENGINE is an engine that, by itself or in or on a piece of

equipment, is designed to be and capable of being carried or moved from one 

location to another. Indications of portability include, but are not limited to, 

wheels, skids, carrying handles, dolly, trailer, platform or mounting. The

operator must demonstrate the necessity of the engine being periodically moved 

from one location to another because of the nature of the operation.

An engine is not portable if:

(A) the engine or its replacement remains or will reside at the same location 

for more than 12 consecutive months. Any engine, such as a back-up 

or stand-by engine, that replaces an engine at a location and is intended 

to perform the same function as the engine being replaced, will be 

included in calculating the consecutive time period. In that case, the 

cumulative time of both engines, including the time between the removal 

of the original engine and installation of the replacement engine, will be 

counted toward the consecutive time period; or
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 4

(B) the engine remains or will reside at a location for less than 12

consecutive months where such a period represents the full length of 

normal annual source operations such as a seasonal source; or

(C) the engine is removed from one location for a period and then it or its 

equivalent is returned to the same location thereby circumventing the 

portable engine residence time requirements.

The period during which the engine is maintained at a designated storage facility 

shall be excluded from the residency time determination.

(15) RATED BRAKE HORSEPOWER (bhp) is the rating specified by the

manufacturer, without regard to any derating, and listed on the engine

nameplate.

(16) RICH-BURN ENGINE WITH A THREE-WAY CATALYST means an

engine designed to operate near stoichiometric conditions with a catalytic

control device that simultaneously reduces emissions of NOx, CO and VOC. 

(17) STATIONARY ENGINE is an engine which is either attached to a foundation 

or if not so attached, does not meet the definition of a portable or non-road 

engine and is not a motor vehicle as defined in Section 415 of the California 

Vehicle Code.

(18) TIER 2 AND TIER 3 DIESEL ENGINES mean engines certified by CARB to 

meet Tier 2 or Tier 3 emission standards in accordance with Title 13, Chapter 

9, Article 4 of the CCR.

(19) USEFUL HEAT RECOVERED means the waste heat recovered from the 

engine exhaust and/or cooling system that is put to productive use. The waste 

heat recovered may by assumed to be 100% useful unless the hot water, steam 

or other medium is vented to the atmosphere, or sent directly to a cooling tower

or other unproductive use.

(20) VOLATILE ORGANIC COMPOUND (VOC) is as defined in Rule 102.

(d) Requirements

(1) Stationary Engines: 

(A) Operators of stationary engines with an amended Rule 1110.1 Emission 

Control Plan submitted by July 1, 1991, or an Approved Emission

Control Plan, designating the permanent removal of engines or the

replacement of engines with electric motors, in accordance with

subparagraph (d)(1)(B), shall do so by December 31, 1999, or not 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 5

operate the engines on or after December 31, 1999 in a manner that 

exceeds the emission concentration limits listed in Table I:

TABLE I

ALTERNATIVE TO ELECTRIFICATION 

CONCENTRATION LIMITS

NOx VOC CO

(ppmvd)

1

11

(ppmvd)

2

30

(ppmvd)

1

70

1

Parts per million by volume, corrected to 15% oxygen on a dry 

basis and averaged over 15 minutes.

2

Parts per million by volume, measured as carbon, corrected to 15% 

oxygen on a dry basis and averaged over the sampling time required 

by the test method.

(B) The operator of any other stationary engine subject to this rule shall 

(i) Remove such engine permanently from service or replace the 

engine with an electric motor, or

(ii) Not operate the engine in a manner that exceeds the emission 

concentration limits listed in Table II.

TABLE II

CONCENTRATION LIMITS

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

bhp = 500: 36

bhp < 500: 45

250 2000

CONCENTRATION LIMITS

EFFECTIVE JULY 1, 2010

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

bhp = 500: 11

bhp < 500: 45

bhp = 500: 30

bhp < 500: 250

bhp = 500: 250

bhp < 500: 2000
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 6

CONCENTRATION LIMITS

EFFECTIVE JULY 1, 2011

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

11 30 250

1

Parts per million by volume, corrected to 15% oxygen on a dry 

basis and averaged over 15 minutes.

2

Parts per million by volume, measured as carbon, corrected to 

15% oxygen on a dry basis and averaged over the sampling time 

required by the test method.

The concentration limits effective on and after July 1, 2010 shall not 

apply to engines that operate less than 500 hours per year or use less 

than 1 x 109 British Thermal Units (Btus) per year (higher heating value) 

of fuel.

If the operator of a two-stroke engine equipped with an oxidation

catalyst and insulated exhaust ducts and catalyst housing demonstrates 

that the CO and VOC limits effective on and after July 1, 2010 are not 

achievable, then the Executive Officer may, with United States

Environmental Protection Agency (EPA) approval, establish

technologically achievable, case-by-case CO and VOC limits in place 

of the concentration limits effective on and after July 1, 2010. The 

case-by-case limits shall not exceed 250 ppmvd VOC and 2000

ppmvd CO.

If the operator of an engine that uses non-pipeline quality natural gas 

demonstrates that due to the varying heating value of the gas a longer 

averaging time is necessary, the Executive Officer may establish for the 

engine a longer averaging time, not to exceed six hours, for any of the 

concentration limits of Table II. Non-pipeline quality natural gas is a 

gas that does not meet the gas specifications of the local gas utility and 

is not supplied to the local gas utility. 

(C) Notwithstanding the provisions in subparagraph (d)(1)(B), the operator 

of any stationary engine fired by landfill or digestor gas (biogas) shall not

operate the engine in a manner that exceeds the emission concentration 

limits of Table III, provided that the facility monthly average biogas 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 7

usage by the biogas engines is 90% or more, based on the higher 

heating value of the fuels used. The calculation of the monthly facility 

biogas use percentage may exclude natural gas fired during: any

electrical outage at the facility; a Stage 2 or higher electrical

emergencies called by the California Independent System Operator

Corporation; and when a sewage treatment plant activates an

Emergency Operations Center or Incident Command System, as part of 

an emergency response plan, because of either high influent flows

caused by precipitation or a disaster. 

The concentration limits effective on and after July 1, 2012 shall

become effective provided the Executive Officer conducts a technology 

assessment that confirms that the limits are achievable, and reports to 

the Governing Board by July 2010, at a regularly scheduled public

meeting.

The concentration limits effective on and after July 1, 2012 shall not 

apply to engines that operate less than 500 hours per year or use less 

than 1 x 109 Btus per year (higher heating value) of fuel.

TABLE III

CONCENTRATION LIMITS FOR LANDFILL 

AND DIGESTOR GAS-FIRED ENGINES

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

bhp = 500: 36 x ECF3

bhp < 500: 45 x ECF3

Landfill Gas: 40

Digestor Gas: 250 x ECF3

2000

CONCENTRATION LIMITS

EFFECTIVE JULY 1, 2012

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

11 30 250

1

Parts per million by volume, corrected to 15% oxygen on a dry basis 

and averaged over 15 minutes.

2

Parts per million by volume, measured as carbon, corrected to 15% 

oxygen on a dry basis and averaged over the sampling time required 

by the test method.

3 ECF is the efficiency correction factor.

The ECF shall be 1.0 unless: 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 8

(i) The engine operator has measured the engine’s net specific 

energy consumption (qa), in compliance with ASME

Performance Test Code PTC 17 -1973, at the average load of 

the engine; and

(ii) The ECF-corrected emission limit is made a condition of the 

engine’s permit to operate. 

The ECF is as follows: 

ECF = 9250 Btus/hp-hr

Measured qa in Btus/hp-hr

Measured qa shall be based on the lower heating value of the fuel. ECF 

shall not be less than 1.0.

The Executive Officer may approve the burning of more than 10% 

natural gas in a landfill or digestor gas-fired engine, when it is necessary,

if: the only alternative to limiting natural gas to 10% would be shutting 

down the engine and flaring more landfill or digestor gas; or the engine 

requires more natural gas in order for a waste heat recovery boiler to 

provide enough thermal energy to operate a sewage treatment plant, 

and other boilers at the facility are unable to provide the necessary 

thermal energy. 

Once an engine complies with concentration limits effective on and after 

July 1, 2012, there shall be no limit on the percentage of natural gas 

burned.

(D) The operator of any new engine subject to subparagraph (e)(1)(B) shall: 

(i) Comply with the requirements of Best Available Control

Technology in accordance with Regulation XIII if the engine 

requires a District permit; or

(ii) Not operate the engine in a manner that exceeds the emission 

concentration limits in Table I if the engine does not require a 

District permit.

(E) By February 1, 2009, the operator of a spark-ignited engine without a 

Rule 218-approved continuous emission monitoring system (CEMS) or 

a Regulation XX (RECLAIM)-approved CEMS shall equip and

maintain the engine with an air-to-fuel ratio controller with an oxygen

sensor and feedback control, or other equivalent technology approved 

by the Executive Officer, CARB and EPA.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 9

(F) New Non-Emergency Electrical Generators

(i) All new non-emergency engines driving electrical-generators 

shall comply with the following emission standards:

TABLE IV

EMISSION STANDARDS FOR NEW 

ELECTRICAL GENERATION ENGINES

Pollutant Emission Standard (lbs/MW-hr)1

NOx 0.070

CO 0.20

VOC 0. 10

2

1. The averaging time of the emission standards is 15

minutes for NOx and CO and the sampling time required 

by the test method for VOC, except as described in the 

following clause.

2. Mass emissions of VOC shall be calculated using a ratio 

of 16.04 pounds of VOC per lb-mole of carbon.

(ii) Engines subject to this subparagraph that produce combined 

heat and electrical power may include one megawatt-hour

(MW-hr) for each 3.4 million Btus of useful heat recovered

(MWth-hr), in addition to each MW-hr of net electricity 

produced (MWe-hr). The compliance of such engines shall be 

based on the following equation:

Lbs = Lbs x Electrical Energy Factor (EEF)

MW-hr MWe-hr

Where:

Lbs/MW-hr = The calculated emissions that shall comply 

with the emission standards in Table IV

Lbs/MWe-hr = The short-term engine emission limit in

pounds per MWe-hr of net electrical

energy produced, averaged over 15

minutes. The engine shall comply with 

this limit at all times.

EEF = The annual MWe-hrs of net electrical

energy produced divided by the sum of
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 10

annual MWe-hrs plus annual MWth-hrs of 

useful heat recovered. The engine

operator shall demonstrate annually that 

the EEF is less than the value required for 

compliance.

(iii) For combined heat and power engines, the short-term emission 

limits in lbs/MWe-hr and the maximum allowed annual EEF 

must be selected by operator and stated on the operating

permit. 

(iv) Notwithstanding Rule 2001, the requirements of this

subparagraph shall apply to NOx emissions from new nonemergency engines driving electrical-generators subject to

Regulation XX (RECLAIM).

(v) This subparagraph does not apply to: engines installed prior to 

February 1, 2008; engines issued a permit to construct prior to 

February 1, 2008 and installed within 12 months of the date of 

the permit to construct; engines for which an application is 

deemed complete by October 1, 2007; engines installed by an 

electric utility on Santa Catalina Island; engines installed at 

remote locations without access to natural gas and electric

power; engines used to supply electrical power to ocean-going 

vessels while at berth, prior to January 1, 2014; or landfill or 

digestor gas-fired engines that meet the requirements of

subparagraph (d)(1)(C).

(2) Portable Engines:

(A) The operator of any portable engine generator subject to this rule shall 

not use the portable generator for: 

(i) Power production into the electric grid, except to maintain grid 

stability during an emergency event or other unforeseen event 

that affects grid stability; or

(ii) Primary or supplemental power to a building, facility, stationary 

source, or stationary equipment, except during unforeseen

interruptions of electrical power from the serving utility,

maintenance and repair operations, and remote operations

where grid power is unavailable. For interruptions of electrical 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 11

power, the operation of a portable generator shall not exceed 

the time of the actual interruption of power. 

This subparagraph shall not apply to a portable generator that complies 

with emission concentration limits of Table I and the other requirements 

in this rule applicable to stationary engines.

(B) The operator of any portable diesel engine shall comply with the 

applicable requirements of the Subchapter 7.5 Airborne Toxic Control 

Measures for diesel particulate matter in Chapter 1, Division 3, Title 17 

of the California Code of Regulations.

(C) The operator of any portable spark-ignited engine shall comply with the 

applicable requirements of the Large Spark Ignition Engine Fleet

Requirements, Article 2, Chapter 15, Division 3, Title 13 of the

California Code of Regulations. 

(e) Compliance

(1) Agricultural Stationary Engines:

(A) The operator of any agricultural stationary engine subject to this rule and 

installed or issued a permit to construct prior to June 3, 2005 shall 

comply with paragraph (d)(1)(B) and the other applicable provisions of 

this rule in accordance with the compliance schedules in Table V:

TABLE V

COMPLIANCE SCHEDULES FOR STATIONARY 

AGRICULTURAL ENGINES

Action Required Tier 2 and Tier 3 Diesel 

Engines, Certified SparkIgnition Engines, and All 

Engines at Facilities with 

Actual Emissions Less 

Than the Amounts in the 

Table of Rule 219(q)

Other Engines

Submit notification of 

applicability to the Executive 

Officer

January 1, 2006 January 1, 2006

Submit to the Executive Officer 

applications for permits to 

construct engine modifications, 

control equipment, or 

replacement engines

March 1, 2009 September 1, 2007
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 12

Initiate construction of engine 

modifications, control 

equipment, or replacement 

engines

September 30, 2009, or 30 

days after the permit to 

construct is issued, whichever 

is later

March 30, 2008, or 

30 days after the 

permit to construct is 

issued, whichever is 

later

Complete construction and 

comply with applicable 

requirements

January 1, 2010, or 60 days 

after the permit to construct 

is issued, whichever is later

July 1, 2008, or 60 

days after the permit 

to construct is issued, 

whichever is later

Complete initial source testing March 1, 2010, or 120 days 

after the permit to construct 

is issued, whichever is later

September 1, 2008, 

or 120 days after the 

permit to construct is 

issued, whichever is 

later

The notification of applicability shall include the following for each 

engine:

(i) Name and mailing address of the operator

(ii) Address of the engine location

(iii) Manufacturer, model, serial number, and date of manufacture of 

the engine

(iv) Application number

(v) Engine type (diesel, rich-burn spark-ignition or lean-burn sparkignition)

(vi) Engine fuel type

(vii) Engine use (pump, compressor, generator, or other)

(viii) Expected means of compliance (engine replacement, control 

equipment installation, or electrification)

(B) The operator of any new agricultural stationary engine that is not subject 

to the compliance schedule of subparagraph (e)(1)(A) for existing

engines shall comply with the requirements of subparagraph (d)(1)(D) 

immediately upon installation.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 13

(2) Non-Agricultural Stationary Engines:

(A) The operator of any stationary engine not meeting the requirements of 

subparagraphs (d)(1)(B) or (d)(1)(C) that go into effect in 2010 or 

later, shall comply with the compliance schedule in Table VI:

TABLE VI

COMPLIANCE SCHEDULE FOR NON

-AGRICULTURAL STATIONARY ENGINES

Action Required

Applicable Compliance

Date

Submit to the Executive Officer 

applications for permits to 

construct engine modifications, 

control equipment, or 

replacement engines

Twelve months before the 

final compliance date

Initiate construction of engine 

modifications, control 

equipment, or replacement 

engines

Three months before the final 

compliance date, or 60 days 

after the permit to construct 

is issued, whichever is later

Complete construction and 

comply with applicable 

requirements

The final compliance date, or

120 days after the permit to 

construct is issued, whichever 

is later

Complete initial source testing 60 days after the final 

compliance date in (d)(1)(B) 

or (d)(1)(C), or 180 days 

after the permit to construct 

is issued, whichever is later

(B) The operator of any stationary engine that elects to amend a permit to 

operate to incorporate ECF-adjusted emission limits shall submit to the 

Executive Officer an application for a change of permit conditions by

August 1, 2008, and comply with emission limits of the previous version 

of this rule until February 1, 2009 when the engine shall be in

compliance with the emission limits of this rule.

(C) The operator of any stationary engine that is required to add operating 

restrictions to a permit to operate to meet the requirements of this rule
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 14

shall submit to the Executive Officer an application for a change of

permit conditions by August 1, 2008.

(3) Stationary Engine CEMS 

(A) The operator of any stationary engine with an existing CEMS shall

commence the reporting required by Rule 218 Subdivision (f) on

January 1, 2008. The first summary report for the six months ending 

June 30, 2008 shall be due on July 30, 2008.

(B) The operator of any stationary engine that is required to modify an

existing CEMS or install a CEMS on an existing engine shall comply 

with the compliance schedule in Table VII. Public agencies shall be 

allowed one year more than the dates in Table VII, except for biogas

engines.

TABLE VII

COMPLIANCE SCHEDULE FOR NEW OR MODIFIED CEMS

ON EXISTING ENGINES

Applicable Compliance Dates For:

Action Required

Non-Biogas 

Engines Rated at 

750 bhp or More

Non-Biogas 

Engines Rated at 

Less than 750 bhp Biogas Engines*

Submit to the Executive 

Officer applications for 

new or modified CEMS

August 1, 2008 August 1, 2009 January 1, 2011

Complete installation and 

commence CEMS 

operation, calibration, and 

reporting requirements

Within 180 days of 

initial approval

Within 180 days of 

initial approval

Within 180 days of 

initial approval

Complete certification 

tests

Within 90 days of 

installation

Within 90 days of 

installation

Within 90 days of 

installation

Submit certification 

reports to Executive 

Officer

Within 45 days after 

tests are completed

Within 45 days after 

tests are completed

Within 45 days 

after tests are 

completed

Obtain final approval of 

CEMS

Within 1 year of 

initial approval

Within 1 year of 

initial approval

Within 1 year of 

initial approval

* A biogas engine is one that is subject to the emission limits of Table III.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 15

(4) Stationary Engine Inspection and Monitoring (I&M) Plans:

The operator of stationary engines subject to the I&M plan provisions of

subparagraph (f)(1)(D) shall:

(A) By August 1, 2008, submit an initial I&M plan application to the 

Executive Officer for approval;

(B) By December 1, 2008, implement an approved I&M plan or the I&M 

plan as submitted if the plan is not yet approved.

Any operator of 15 or more stationary engines subject to the I&M plan

provisions shall comply with the above schedule for at least 50% of engines, 

and for the remaining engines shall:

(C) By February 1, 2009, submit an initial I&M plan application to the 

Executive Officer for approval;

(D) By June 1, 2009, implement an approved I&M plan or the I&M plan

as submitted if the plan is not yet approved.

(5) Stationary Engine Air-to-Fuel Ratio Controllers

(A) The operator of any stationary engine that does not have an air-to-fuel 

ratio controller, as required by subparagraph (d)(1)(E), shall comply 

with those requirements in accordance with the compliance schedule in 

Table VI, except that the application due date is no later than May 1, 

2008 and the initial source testing may be conducted at the time of the 

testing required by subparagraph (f)(1)(C).

(B) The operator of any stationary engine that has the air-to-fuel ratio 

controller required by subparagraph (d)(1)(E), but it is not listed on the 

permit to operate, shall submit to the Executive Officer an application to 

amend the permit by April 1, 2008.

(C) The operator of more than five engines that do not have air-to-fuel ratio 

controllers may take an additional three months, to May 1, 2009, to 

install the equipment on up to 50% of the affected engines.

(6) New Stationary Engines

The operator of any new stationary engine issued a permit to construct after 

February 1, 2008 shall comply with the applicable I&M or CEMS 

requirements of this rule when operation commences. If applicable, the 

operator shall provide the required information in subparagraph (f)(1)(D) to the 

Executive Officer prior to the issuance of the permit to construct so that the 

I&M procedures can be included in the permit. A separate I&M plan

application is not required.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 16

(7) Biogas Engines

For any biogas engine for which the operator applies to the Executive Officer 

by April 1, 2008 for a change of permit conditions for ECF-corrected emission 

limits, or the approval to burn more than 10 percent natural gas in accordance 

with subparagraph (d)(1)(C), the biogas engine shall not be subject to the initial 

concentration limits of Tables II or III until August 1, 2008, provided the

operator continues to comply with all emission limits in effect prior to February 

1, 2008.

(8) Compliance Schedule Exception

If an engine operator submits to the Executive Officer an application for an 

administrative change of permit conditions to add a permit condition that causes 

the engine permit to expire by the effective date of any requirement of this rule, 

then the operator is not required to comply with the earlier steps required by 

this subdivision for that requirement. The effective date for the CEMS

requirements shall be one year after the date that a CEMS application is due.

(9) Exceedance of Usage Limits

(A) If an engine was initially exempt from the new concentration limits in 

subparagraph (d)(1)(B) or subparagraph (d)(1)(C) that take effect on 

or after July 1, 2010 because of low engine use but later exceeds the 

low-use criteria, the operator shall bring the engine into compliance with 

the rule in accordance with the schedule in Table VI with the final

compliance date in Table VI being twelve months after the conclusion of 

the first twelve-month period for which the engine exceeds the low-use 

criteria.

(B) If engines that were initially exempt from new CEMS by the low-use 

criterion in subclause (f)(1)(A)(ii)(I) later exceed that criterion, the

operator shall install CEMS on those engines in accordance with the 

schedule in Table VII, except that the date for submitting the CEMS 

application in Table VII shall be six months after the conclusion of the 

first twelve-month period for which the engines exceed the criterion.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 17

(f) Monitoring, Testing, Recordkeeping and Reporting

(1) Stationary engines:

The operator of any engine subject to the provisions of paragraph (d)(1) of this 

rule shall meet the following requirements:

(A) Continuous Emission Monitoring

(i) For engines of 1000 bhp and greater and operating more than 

two million bhp-hr per calendar year, a NOx and CO

continuous emission monitoring system (CEMS) shall be

installed, operated and maintained in calibration to demonstrate 

compliance with the emission limits of this rule.

(ii) (I) For facilities with engines subject to paragraph (d)(1), 

having a combined rating of 1500 bhp or greater at the 

same location, and having a combined fuel usage of

more than 16 x 109 Btus per year (higher heating value), 

CEMS shall be installed, operated and maintained in 

calibration to demonstrate compliance of those engines 

with the applicable NOx and CO emission limits of this 

rule. 

(II) Any engine that as of October 1, 2007 is located within 

75 feet of another engine (measured from engine block 

to engine block) is considered to be at the same

location. Operators of new engines shall not install

engines farther than 75 feet from another engine unless 

the operator demonstrates to the Executive Officer that 

operational needs or space limitations require it.

(III) The following engines shall not be counted toward the 

combined rating or required to have a CEMS by this 

clause: engines rated at less than 500 bhp; standby 

engines that are limited by permit conditions to only

operate when other primary engines are not operable;

engines that are limited by permit conditions to operate 

less than 1000 hours per year or a fuel usage of less 

than 8 x 109 Btus per year (higher heating value of all 

fuels used); engines that are used primarily to fuel public 

natural gas transit vehicles and that are required by a 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 18

permit condition to be irreversibly removed from

service by December 31, 2014; and engines required to 

have a CEMS by the previous clause. A CEMS shall 

not be required if permit conditions limit the

simultaneous use of the engines at the same location in a 

manner to limit the combined rating of all engines in

simultaneous operation to less than 1500 bhp. 

(IV) For engines rated below 1000 bhp, the CEMS may be 

time shared by multiple engines. 

(V) Operation of engines by the electric utility in the Big 

Bear Lake area during the failure of a transmission line 

to the utility may be excluded from an hours-per-year 

or fuel usage limit that is elected by the operator

pursuant to subclause (f)(1)(A)(ii)(III).

(VI) In lieu of complying with subclause (f)(1)(A)(ii)(I), an 

operator that is a public agency, or is contracted to 

operate engines solely for a public agency, may comply 

with the Inspection and Monitoring Plan requirements of 

subparagraph (f)(1)(D), except that the operator shall 

conduct emission checks at least weekly or every 150 

operating hours, whichever occurs later. If any such 

engine is found to exceed an applicable NOx or CO 

limit by a source test required by subparagraph

(f)(1)(C) or District test using a portable analyzer on 

three or more occasions in any 12-month period, the 

operator shall comply with the CEMS requirements of 

this subparagraph for such engine in accordance with 

the compliance schedule of Table VII, except that the 

operator shall submit a CEMS application to the

Executive Officer within six months of the third

exceedance.

(iii) All CEMS required by this rule shall:

(I) Comply with the applicable requirements of Rule 218, 

including equipment specifications and certification,

operating, recordkeeping, quality assurance and
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 19

reporting requirements, except as otherwise authorized 

by this rule;

(II) Include equipment that measures and records exhaust 

gas concentrations, both uncorrected and corrected to 

15 percent oxygen on a dry basis; and

(III) Have data gathering and retrieval capability approved 

by the Executive Officer

(iv) The operator of an engine that is required to install CEMS may 

request the Executive Officer to approve an alternative

monitoring device (or system components) to demonstrate

compliance with the emission limits of this rule. The applicant 

shall demonstrate to the Executive Officer that the proposed 

alternative monitoring device is at a minimum equivalent in

relative accuracy, precision, reliability, and timeliness to a

CEMS for that engine, according to the criteria specified in 40 

CFR Part 75 Subpart E. In lieu of the criteria specified in 40 

CFR Part 75 Subpart E, substitute criteria is acceptable if the 

applicant demonstrates to the Executive Officer that the

proposed alternative monitoring device is at minimum equivalent 

in relative accuracy, precision, reliability, and timeliness to a 

CEMS for that engine. Upon approval by the Executive

Officer, the substitute criteria shall be submitted to EPA as an 

amendment to the State Implementation Plan (SIP).

If the alternative monitoring device is denied or fails to be 

recertified, a CEMS shall be required.

(v) Notwithstanding the requirements of Rules 218 and 218.1,

operators of engines that are required to install a CEMS by 

clause (ii) of this subparagraph may:

(I) Store data electronically without a strip chart recorder, 

but there shall be redundant data storage capability for 

at least 15 days of data. The operator must

demonstrate that both sets of data are equivalent.

(II) Conduct relative accuracy testing on the same schedule 

for source testing in clause (f)(1)(C)(i), instead of
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 20

annually. The minimum sampling time for each test is 15 

minutes.

(vi) Notwithstanding the requirements of Rules 218 and 218.1,

operators of engines that are required to install a CEMS by 

clause (ii) of this subparagraph, and that are to be monitored by 

a timeshared CEMS, may:

(I) Monitor an engine with the CEMS for 15 consecutive 

minutes, purge for the minimum required purge time, 

then monitor the next engine for 15 consecutive minutes. 

The CEMS shall operate continuously in this manner, 

except for required calibrations.

(II) Record the corrected and uncorrected NOx, CO and 

diluent data at least once per minute and calculate and 

record the 15-minute average corrected concentrations 

for each sampling period. 

(III) Have sample lines to each engine that are not the same 

length. The purge time will be based on the sample line 

with the longest response time. Response times shall be 

checked during cylinder gas audits. Sample lines shall 

not exceed 100 feet in length.

(IV) Conduct a minimum of five tests for each engine during 

relative accuracy tests. 

(V) Perform a cylinder gas audit every calendar quarter on 

each engine, except for engines for which relative

accuracy testing was conducted that quarter. 

(VI) Exclude monitoring of nitrogen dioxide (NO2) for richburn engines, unless source testing demonstrates that 

NO2 is more than 10 percent of total NOx.

(VII) Conduct daily calibration error (CE) tests by injecting 

calibration gases at the analyzers, except that at least 

once per week the CE test shall be conducted by

injecting calibration gases as close to the probe tip as 

practical. 

(VIII) Stop operating and calibrating the CEMs during any 

period that the operator has a continuous record that 

the engine was not in operation. 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 21

(vii) A CO CEMS shall not be required for lean-burn engines or an 

engine that is subject to Regulation XX (RECLAIM), and not 

required to have a NOx CEMS by that regulation. 

(viii) Notwithstanding the requirements of this paragraph and

paragraph (c)(2) of Rule 2012, an operator may take an

existing NOx CEMS out of service for up to two weeks

(cumulative) in order to modify the CEMS to add CO

monitoring.

(B) Elapsed Time Meter

Maintain an operational non-resettable totalizing time meter to

determine the engine elapsed operating time.

(C) Source Testing

(i) Effective August 1, 2008, conduct source testing for NOx, 

VOC reported as carbon, and CO concentrations

(concentrations in ppm by volume, corrected to 15 percent 

oxygen on dry basis) at least once every two years, or every 

8,760 operating hours, whichever occurs first. Relative

accuracy tests required by Rule 218.1 or 40 CFR Part 75 

Subpart E will satisfy this requirement for those pollutants

monitored by a CEMS. The source test frequency may be 

reduced to once every three years if the engine has operated 

less than 2,000 hours since the last source test. If the engine 

has not been operated within three months of the date a source 

test is required, the source test shall be conducted when the 

engine resumes operation for a period longer than either seven 

consecutive days or 15 cumulative days of operation. The 

operator of the engine shall keep sufficient operating records to 

demonstrate that it meets the requirements for extension of the 

source testing deadlines.

(ii) Conduct source testing for at least 30 minutes during normal 

operation (actual duty cycle). This test shall not be conducted 

under a steady-state condition unless it is the normal operation. 

In addition, conduct source testing for NOx and CO emissions 

for at least 15 minutes at: an engine’s actual peak load, or the 

maximum load that can be practically achieved during the test,

and; at actual minimum load, excluding idle, or the minimum 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 22

load that can be practically achieved during the test. These 

additional two tests are not required if the permit limits the 

engine to operating at one defined load, ± 10%. No pre-tests 

for compliance are permitted. The emission test shall be

conducted at least 40 operating hours, or at least 1 week, after 

any engine servicing or tuning. If an emission exceedance is 

found during any of the three phases of the test, that phase shall 

be completed and reported. The operator shall correct the 

exceedance, and the source test may be immediately resumed. 

(iii) Use a contractor to conduct the source testing that is approved 

by the Executive Officer under the Laboratory Approval

Program for the necessary test methods. 

(iv) Submit a source test protocol to the Executive Officer for

written approval at least 60 days before the scheduled date of 

the test. The source test protocol shall include the name, 

address and phone number of the engine operator and a 

District-approved source testing contractor that will conduct the 

test, the application and permit number(s), emission limits, a 

description of the engine(s) to be tested, the test methods and 

procedures to be used, the number of tests to be conducted 

and under what loads, the required minimum sampling time for 

the VOC test, based on the analytical detection limit and

expected VOC levels, and a description of the parameters to 

be measured in accordance with the I&M plan required by 

subparagraph (f)(1)(D). The source test protocol shall be

approved by the Executive Officer prior to any testing. The 

operator is not required to submit a protocol for approval if: 

there is a previously approved protocol that meets these

requirements; the engine has not been altered in a manner that 

requires a permit alteration; and emission limits have not

changed since the previous test. If the operator submits the 

protocol by the required date, and the Executive Officer takes 

longer than 60 days to approve the protocol, the operator shall 

be allowed the additional time needed to conduct the test.

(v) Provide the Executive Officer at least 30 days prior notice of 

any source test to afford the Executive Officer the opportunity 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 23

to have an observer present. If after 30 days notice for an 

initially scheduled performance test, there is a delay (due to 

operational problems, etc.) in conducting the scheduled

performance test, the engine operator shall notify the Executive 

Officer as soon as possible of any delay in the original test date, 

either by providing at least seven days prior notice of the 

rescheduled date of the performance test, or by arranging a 

rescheduled date with the Executive Officer by mutual

agreement.

(vi) Submit all source test reports, including a description of the 

equipment tested, to the Executive Officer within 60 days of 

completion of the test.

(vii) By February 1, 2009, provide, or cause to be provided, source 

testing facilities as follows:

(I) Sampling ports adequate for the applicable test 

methods. This includes constructing the air pollution

control system and stack or duct such that pollutant 

concentrations can be accurately determined by

applicable test methods;

(II) Safe sampling platform(s), scaffolding or mechanical

lifts, including safe access, that comply with California 

General Safety Orders. Agricultural stationary engines 

are excused from this subclause if they are in remote 

locations without electrical power;

(III) Utilities for sampling and testing equipment. Agricultural 

stationary engines are exempt from this subclause if they 

are on wheels and moved to storage during the off

season.

(D) Inspection and Monitoring (I&M) Plan

Submit to the Executive Officer for written approval and implement an 

I&M plan. One plan application is required for each facility. The I&M 

plan shall include:

(i) Identification of engine and control equipment operating

parameters necessary to maintain pollutant concentrations within 

the rule and permit limits. This shall include, but not be limited 

to:
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 24

(I) Procedures for using a portable NOx, CO and oxygen 

analyzer to establish the set points of the air-to-fuel ratio 

controller (AFRC) at 25%, 60% and 95% load (or fuel 

flow rate), ± 5%, or the minimum, midpoint and

maximum loads that actually occur during normal

operation, ± 5%, or at any one load within the ± 10% 

range that an engine permit is limited to in accordance 

with clause (f)(1)(C)(ii);

(II) Procedures for verifying that the AFRC is controlling 

the engine to the set point during the daily monitoring 

required by clause (f)(1)(D)(iv); 

(III) Procedures for reestablishing all AFRC set points with 

a portable NOx, CO and oxygen analyzer whenever a 

set point must be readjusted, within 24 hours of an

oxygen sensor replacement, and, for rich-burn engines 

with three way catalysts, between 100 and 150 engine 

operating hours after an oxygen sensor replacement;

(IV) For engines with catalysts, the maximum allowed

exhaust temperature at the catalyst inlet, based on

catalyst manufacturer specifications;

(V) For lean-burn engines with selective catalytic control

devices, the minimum exhaust temperature at the

catalyst inlet required for reactant flow (ammonia or 

urea), and procedures for using a portable NOx and 

oxygen analyzer to establish the acceptable range of 

reactant flow rate, as a function of load.

Parameter monitoring is not required for diesel engines without 

exhaust gas recirculation and catalytic exhaust control devices.

(ii) Procedures for alerting the operator to emission control

malfunctions. Engine control systems, such as air-to-fuel ratio 

controllers, shall have a malfunction indicator light and audible 

alarm. 

(iii) Procedures for at least weekly or every 150 engine operating 

hours, whichever occurs later, emissions checks by a portable 

NOx, CO and oxygen analyzer. 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 25

(I) If an engine is in compliance for three consecutive

emission checks, without any adjustments to the oxygen 

sensor set points, then the engine may be checked

monthly or every 750 engine operating hours,

whichever occurs later, until there is a noncompliant 

emission check or, for rich-burn engines with three-way 

catalysts, the oxygen sensor is replaced.

(II) For diesel engines and other lean-burn engines that are 

subject to Regulation XX or have a NOx CEMs, and 

that are subject to a CO limit more stringent than the 

2000 ppmvd limit of Tables II or III, a CO emission 

check shall be performed at least quarterly, or every 

2,000 engine operating hours, whichever occurs later. 

(III) For diesel engines and other lean-burn engines that are 

subject to Regulation XX or have a NOx CEMs, and 

that are not subject to a CO limit more stringent than 

the 2000 ppmvd limit of Tables II or III, emission

checks are not required.

(IV) No engine or control system maintenance or tuning may 

be conducted within 72 hours prior to the emission

check, unless it is an unscheduled, required repair.

(V) The portable analyzer shall be calibrated, maintained 

and operated in accordance with the manufacturer’s 

specifications and recommendations and the Protocol 

for the Periodic Monitoring of Nitrogen Oxides,

Carbon Monoxide, and Oxygen from Stationary

Engines Subject to South Coast Air Quality

Management District Rule 1110.2, approved on

February 1, 2008, or subsequent protocol approved by 

EPA and the Executive Officer.

(iv) Procedures for at least daily monitoring, inspection and

recordkeeping of:

(I) engine load or fuel flow rate;

(II) the set points, maximums and acceptable ranges of the 

parameters identified by clause (f)(1)(D)(i), and the

actual values of the same parameters;
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 26

(III) the engine elapsed time meter operating hours;

(IV) the operating hours since the last emission check

required by (f)(1)(D)(iii);

(V) for rich-burn engines with three-way catalysts, the

difference of the exhaust temperatures (?T) at the inlet 

and outlet of the catalyst (changes in the ?T can 

indicate changes in the effectiveness of the catalyst);

(VI) engine control system and AFRC system faults or

alarms that affect emissions.

The daily monitoring and recordkeeping may be done in person 

by the operator, or by remote monitoring. 

(v) Procedures for responding to, diagnosing and correcting

breakdowns, faults, malfunctions, alarms, emission checks

finding emissions in excess of rule or permit limits, and 

parameters out-of-range. 

(I) For a breakdown resulting in a violation of this rule or a 

permit condition, or for an emission check that finds 

emissions in excess of those allowed by this rule or a 

permit condition, the operator shall correct the problem 

and demonstrate compliance with another emission

check, or shut down an engine by the end of an

operating cycle, or within 24 hours from the time the 

operator knew of the breakdown or excess emissions, 

or reasonably should have known, whichever is sooner. 

(II) For other problems, such as parameters out-of-range, 

an operator shall correct the problem and demonstrate 

compliance with another emission check within 48

hours of the operator first knowing of the problem.

(III) An operator shall not be considered in violation of the 

emission limits of this rule or in permit conditions if the 

operator complies with this subparagraph and the

reporting requirements of subparagraph (f)(1)(H). Any 

emission check conducted by District staff that finds 

excess emissions is a violation. 

(vi) Procedures and schedules for preventive and corrective

maintenance.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 27

(vii) Procedures for reporting noncompliance to the Executive

Officer in accordance with subparagraph (f)(1)(H).

(viii) Procedures and format for the recordkeeping of monitoring and 

other actions required by the plan.

(ix) Procedures for plan revisions. Before any change in I&M plan 

operations can be implemented, the revised I&M plan shall be 

submitted to and approved by the Executive Officer. The

operator shall apply for a plan revision prior to any change in 

emission limits or control equipment.

(x) An engine is not subject to this subparagraph if it is required by 

this rule to have a NOx and CO CEMS, or voluntarily has a 

NOx and CO CEMS that complies with this rule.

(E) Operating Log

Maintain a monthly engine operating log that includes:

(i) Total hours of operation;

(ii) Type of liquid and/or type of gaseous fuel;

(iii) Fuel consumption (cubic feet of gas and gallons of liquid); and

(iv) Cumulative hours of operation since the last source test required 

in subparagraph (f)(1)(C).

Facilities subject to Regulation XX may maintain a quarterly log for 

engines that are designated as a process unit on the facility permit.

(F) New Non-Emergency Electrical Generating Engines

Operators of engines subject to the requirements of subparagraph

(d)(1)(F) shall also meet the following requirements.

(i) The engine generator shall be monitored with a calibrated

electric meter that measures the net electrical output of the 

engine generator system, which is the difference between the 

electrical output of the generator and the electricity consumed 

by the auxiliary equipment necessary to operate the engine 

generator. 

(ii) For engines monitored with a CEMS, the emissions of the 

monitored pollutants in ppmvd corrected to 15% O2, lbs/hr, 

and lbs/MWe-hr and the net MWe-hrs produced shall be

calculated and recorded for the four 15-minute periods of each 

hour of operation. The mass emissions of NOx shall be

calculated based on the measured fuel flow and one of the F 
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 28

factor methods of 40 CFR 60, Appendix A, Method 19, or 

other method approved by the Executive Officer. Mass 

emissions of CO shall be calculated in the same manner as 

NOx, except that the ppmvd CO shall be converted to lb/scf 

using a conversion factor of 0.727 x

10-7. 

(iii) For NOx and CO emissions from engines not monitored with a 

CEMS and VOC emissions from all engines, the emissions of 

NOx, CO and VOC in lbs/MWe-hr shall be calculated and 

recorded whenever the pollutant is measured by a source test 

or emission check. Mass emissions of NOx and CO shall be 

calculated in the same manner as the previous clause. Mass 

emissions of VOC shall be calculated in the same manner,

except that the ppmvd VOC as carbon shall be converted to 

lb/scf using a conversion factor of 0.415 x 10-7.

(iv) For engines generating combined heat and power that rely on 

the EEF to comply with Table IV emission standards, the daily 

and annual useful heat recovered (MWth-hrs), net electrical

energy generated (MWe-hrs) and EEF shall be monitored and 

recorded.

(v) Other methods of calculating mass emissions than those 

specified, such as by direct measurement of exhaust volume,

may be used if approved by the Executive Officer. All

monitoring, calculation, and recordkeeping procedures must be 

approved by the Executive Officer. 

(vi) Operators of combined heat and power engines shall submit to 

the Executive Officer the reports of the following information 

within 15 days of the end of the first year of operation, and 

thereafter within 15 days of the end of each calendar year: the 

annual net electrical energy generated (MWe-hrs); the annual 

useful heat recovered (MWth-hrs), the annual EEF calculated in 

accordance with clause (d)(1)(F)(ii); and the maximum annual 

EEF allowed by the operating permit. If the actual annual EEF 

exceeds the allowed EEF, the report shall also include the time 

periods and emissions for all instances where emissions

exceeded any emission standard in Table IV.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 29

(G) Portable Analyzer Operator Training

The portable analyzer tests required by the I&M Plan requirements of 

subparagraph (f)(1)(D) shall only be conducted by a person who has 

completed an appropriate District-approved training program in the 

operation of portable analyzers and has received a certification issued 

by the District.

(H) Reporting Requirements

(i) The operator shall report to the Executive Officer, by telephone 

(1-800-CUT-SMOG or 1-800-288-7664) or other Districtapproved method, any breakdown resulting in emissions in

excess of rule or permit emission limits within one hour of such 

noncompliance or within one hour of the time the operator 

knew or reasonably should have known of its occurrence.

Such report shall identify the time, specific location, equipment 

involved, responsible party to contact for further information, 

and to the extent known, the causes of the noncompliance, and 

the estimated time for repairs. In the case of emergencies that 

prevent a person from reporting all required information within 

the one-hour limit, the Executive Officer may extend the time for 

the reporting of required information provided the operator has 

notified the Executive Officer of the noncompliance within the 

one-hour limit.

(ii) Within seven calendar days after the reported breakdown has 

been corrected, but no later than thirty calendar days from the 

initial date of the breakdown, unless an extension has been 

approved in writing by the Executive Officer, the operator shall 

submit a written breakdown report to the Executive Officer 

which includes:

(I) An identification of the equipment involved in causing, 

or suspected of having caused, or having been affected 

by the breakdown;

(II) The duration of the breakdown;

(III) The date of correction and information demonstrating 

that compliance is achieved;

(IV) An identification of the types of excess emissions, if any, 

resulting from the breakdown;
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 30

(V) A quantification of the excess emissions, if any, resulting 

from the breakdown and the basis used to quantify the 

emissions;

(VI) Information substantiating whether the breakdown 

resulted fromoperator error, neglect or improper 

operation or maintenance procedures;

(VII) Information substantiating that steps were immediately 

taken to correct the condition causing the breakdown, 

and to minimize the emissions, if any, resulting from the 

breakdown;

(VIII) A description of the corrective measures undertaken 

and/or to be undertaken to avoid such a breakdown in 

the future; and

(IX) Pictures of any equipment which failed, if available.

(iii) Within 15 days of the end of each calendar quarter, the

operator shall submit to the Executive Officer a report that lists 

each occurrence of a breakdown, fault, malfunction, alarm, 

engine or control system operating parameter out of the

acceptable range established by an I&M plan or permit

condition, or an emission check that finds excess emissions. 

Such report shall be in a District-approved format, and for each 

incident shall identify the time of the incident, the time the 

operator learned of the incident, specific location, equipment 

involved, responsible party to contact for further information, to 

the extent known the causes of the event, the time and 

description of corrective actions, including shutting an engine 

down, and the results of all portable analyzer NOx and CO 

emissions checks done before or after the corrective actions. 

The operator shall also report if no incidents occurred. 

(2) Portable engines:

The operator of any portable engine shall maintain a monthly engine operating 

log that includes:

(i) Total hours of operation; or

(ii) Type of liquid and/or type of gaseous fuel; and

(iii) Fuel consumption (cubic feet of gas and gallons of liquid).
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 31

Facilities subject to Regulation XX may maintain a quarterly log for engines that 

are designated as a process unit on the facility permit.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 32

(3) Recordkeeping for All Engines

All data, logs, test reports and other information required by this rule shall be 

maintained for at least five years and made available for inspection by the 

Executive Officer.

(g) Test Methods

Testing to verify compliance with the applicable requirements shall be conducted in 

accordance with the test methods specified in Table VIII, or any test methods approved 

by CARB and EPA, and authorized by the Executive Officer.

TABLE VIII

TESTING METHODS

Pollutant Method

NOx District Method 100.1

CO District Method 100.1

VOC District Method 25.1* or District Method 25.3*

* Excluding ethane and methane

A violation of any standard of this rule established by any of the specified test methods, 

or any test methods approved by the CARB or EPA, and authorized by the Executive 

Officer, shall constitute a violation of this rule.

(h) Exemptions

The provisions of subdivision (d) shall not apply to:

(1) All orchard wind machines powered by an internal combustion engine.

(2) Emergency standby engines, engines used for fire-fighting and flood control, and 

any other emergency engines approved by the Executive Officer, which have 

permit conditions that limit operation to 200 hours or less per year as

determined by an elapsed operating time meter, and agricultural emergency 

standby engines that are exempt from a District permit and operate 200 hours 

or less per year as determined by an elapsed operating time meter.

(3) Laboratory engines used in research and testing purposes.

(4) Engines operated for purposes of performance verification and testing of

engines.

(5) Auxiliary engines used to power other engines or gas turbines during start-ups.
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 33

(6) Portable engines that are registered under the state registration program

pursuant to Title 13, Article 5 of the CCR.

(7) Nonroad engines, with the exception that subparagraph (d)(2)(A) shall apply to 

portable generators.

(8) Engines operating on San Clemente Island.

(9) Agricultural stationary engines provided that:

(A) The operator submits documentation to the Executive Officer by the 

applicable date in Table V when permit applications are due that the 

applicable electric utility has rejected an application for an electrical line 

extension to the location of the engines, or the Executive Officer

determines that the operator does not qualify, due to no fault of the 

operator, for funding authorized by California Health and Safety Code 

Section 44229; and

(B) The operator replaces the engines, in accordance with the compliance 

schedule of Table IX, with engines certified by CARB to meet the Tier 

4 emission standards of 40 CFR Part 1039 Section 1039.101, Table 1. 

These Tier 4 replacement engines shall be considered to comply with 

Best Available Control Technology; and

(C) The operator does not operate the Tier 4 engines in a manner that 

exceeds the not-to-exceed standards of 40 CFR Section 1039.101, 

Paragraph (e), as determined by the test methods of subdivision (g) of 

this rule. 

TABLE IX

COMPLIANCE SCHEDULE FOR INSTALLATION OF NEW 

TIER 4 STATIONARY AGRICULTURAL ENGINES

Action Required Due Date

Submit to the Executive Officer 

applications for permits to construct 

engine modifications, control 

equipment, or replacement engines

March 1, 2013
Rule 1110.2 (Cont.) (Amended February 1, 2008)

1110.2 - 34

Initiate construction of engine 

modifications, control equipment, or 

replacement engines

September 30, 2013, or 30 days after the 

permit to construct is issued, whichever is 

later

Complete construction and comply 

with applicable requirements

January 1, 2014, or 60 days after the 

permit to construct is issued, whichever is 

later

Complete initial source testing March 1, 2014, or 120 days after the 

permit to construct is issued, whichever is 

later

(10) An engine start-up, until sufficient operating temperatures are reached for

proper operation of the emission control equipment. The start-up period shall

not exceed 30 minutes, unless the Executive Officer approves a longer period 

for an engine and makes it a condition of the engine permit.

(11) An engine start-up, after an engine overhaul or major repair requiring removal of 

a cylinder head, for a period not to exceed four operating hours.

(12) The initial commissioning of a new engine for a period specified by permit 

conditions, provided the operator takes measures to reduce emissions and the 

duration of the commissioning to the extent possible. The commissioning period 

shall not exceed 150 operating hours.