(Adopted: 12/20/93; Amended: 10/26/94)

MDAQMD RULE 1160

Internal Combustion Engines 1160-1

RULE 1160

Internal Combustion Engines

(A) General

(1) Purpose: The purpose of this rule is to establish limits for emissions associated

with emergency, portable, standby, or stationary internal combustion engines.

(2) Applicability: This rule is applicable to any stationary internal combustion engine

rated at 500 or more brake horsepower (bhp), when located within the Federal

Ozone Non-attainment Area.

(B) Definitions

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

(1) "Aggregate Emissions": A facility-wide sum of actual emissions, on an

emissions category specific basis, from engines subject to this rule operated at a

single facility. Such "aggregating" of emissions will include all regulated

emissions categories subject to this rule.

(2) "Baseline Emission Rate": Emissions under normal operating conditions, prior to

control, determined by an emissions compliance test conducted in accordance

with the requirements specified in Section (F). The baseline emissions shall be

adjusted to reflect any operational limit or control equipment installed prior to

January 1, 1991.

(3) "Diesel-Cycle Engine": A two or four stroke compression ignition engine that is

operated on any liquid or gaseous fuel, and with an exhaust stream oxygen

concentration of four percent by volume or greater.

(4) "Emergency Internal Combustion Engines": For purposes of this rule, internal

combustion engines used during periods of loss of commercial power at facilities

normally serviced with commercial power. These units are normally operated

during periods of compliance and operational preparedness testing (1 hr/wk) and

during periods of actual power loss.
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1160-2 Internal Combustion Engines

(5) "Emissions Compliance Test": An emissions compliance test conducted in

accordance with a District approved test protocol pursuant to the District's

Compliance Test Procedural Manual.

(6) "Emission Control Plan": A document which outlines how an existing facility

will comply with the requirements of this rule.

(7) "Engine Rating": The output of an engine as determined by the engine

manufacturer and/or listed on the nameplate of the unit, regardless of any derating.

(8) "Federal Ozone Non-attainment Area": That portion of San Bernardino County

that lies within the lines which begin at: (a) the San Bernardino - Riverside

County boundary, running north along the range line common to Range 3 East and

Range 2 East; (b) then west along the township line common to Township 2

North and Township 3 North; (c) then north along the San Bernardino - Los

Angeles County Boundary and the San Bernardino - Kern County Boundary; (d)

then east along latitude 35 degrees, 10 minutes north; (e) then south along

longitude 115 degrees, 45 minutes west, and west along the San Bernardino -

Riverside County Boundary (see Map 1).

(9) "Lean-burn Engine": A spark-ignited engine that is operated with any liquid or

gaseous fuel and with an exhaust stream oxygen concentration of four percent by

volume, or greater.

(10) "Portable Engines": Engines which are operated at one site, but not permanently

affixed to only one location. Portable equipment includes internal combustion 

engines which are transportable and may be mounted on mobile sources, trailers,

skids, or other platforms.

(11) "Rich-burn Engine": A spark ignited engine that is operated with any liquid or

gaseous fuel, and with a exhaust stream oxygen concentration of less than four

percent by volume.

(12) "Standby Engine": Any internal combustion engine which operates as a

mechanical or electrical power source as a temporary replacement for a primary

power source during periods of fuel/energy shortage or while the primary power

source is undergoing maintenance or repairs.

(13) "Internal Combustion Engine": Any spark or compression ignited reciprocating

stationary internal combustion engine that is attached to a foundation at a location,

or is portable and operated at a location for more than 90 days in any consecutive

twelve month period, excluding engines used for self propulsion of a vehicle.
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(14) "Volatile Organic Compound" : Any compound containing at least one atom of

carbon, except for the following compounds: ethane, methane, carbon monoxide,

carbon dioxide, carbonic acid, metallic carbides or carbonates, ammonium

carbonate, and those compounds listed in 40 CFR 51.100(S)(1).

(C) Requirements

(1) Emissions Standards

(a) VOC Emissions - internal combustion engines subject to this rule shall not

exceed 106 ppmv* of Volatile Organic Compounds (VOCs), except for:

(i) internal combustion engines at Southern California Gas Newberry

Springs facility shall not exceed 255 ppmv*

 of VOCs.

(b) NOx Emissions - internal combustion engines subject to this rule shall not

exceed the following emission standards, unless opting for the alternative

NOx emissions compliance strategy:

(i) Rich-burn Engines:

Oxides of Nitrogen (NOx) 50 ppmv*

Carbon Monoxide (CO) 4500 ppmv*

(ii) Lean-burn Engines:

Oxides of Nitrogen (NOx) 140 ppmv*

Carbon Monoxide (CO) 4500 ppmv*

(iii) Diesel-cycle Engines:

Oxides of Nitrogen (NOx) 700 ppmv*

Carbon Monoxide (CO) 4500 ppmv*

*

All ppmv limitations shall be referenced at 15 percent volume stack gas oxygen

measured on a dry basis and averaged over 15 consecutive minutes.

(2) Alternative Compliance Strategy - NOx Emissions Only 

The VOC and CO standards continue to apply when the alternative NOx

emissions compliance strategy is selected by the permittee in consultation with the

District. For NOx emissions only, the alternative strategy is a specified minimum

percent reduction in emissions of NOx from the baseline emissions rate. Engines

subject to this rule, opting for the alternative compliance strategy, shall achieve at

least the following minimum reductions:
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1160-4 Internal Combustion Engines

(a) Rich-burn Engines

not less than an 90 percent reduction of NOx emissions from the baseline

emission rate

(b) Lean-burn Engines

not less than an 80 percent reduction of NOx emissions from the baseline

emission rate

(c) Diesel-cycle Engines

not less than a 30 percent reduction of NOx emissions from the baseline

emission rate

Following the baseline emission rate determination for each engine subject to this

rule, the choice of which emission compliance standard shall apply, shall be made

on a case-by-case basis by the District in consultation with the permittee. When

such a determination is made, the Authority To Construct/Permit To Operate

(ATC/PTO) shall thereafter contain specific enforceable operating conditions

which will ensure compliance with the selected standard/limit.

The percent reduction as measured across the control device or relative to the

baseline emission rate of each permit unit shall be determined on an emission rate

basis. A permittee may petition the District to be allowed to "aggregate" the

engine emissions facility-wide by submitting an Emission Control Plan. The

District may approve the facility's Emission Control Plan, pursuant to subsection

(C)(4), on a case-by-case basis. 

(3) Demonstrated Engine Efficiency Alternative

For engines subject to this rule with a demonstrated efficiency greater than 30

percent, the following procedure may be used to determine the alternate allowable

emissions limit. Each emission limit expressed in subsection (C)(1) may be

multiplied by the engine efficiency, "E", divided by the reference efficiency of 30

percent. Engine efficiency shall be determined by using one of the following two

methods, whichever is lower:

(a) E = (3413 BTU/kW-Hr)(100) 

 Actual Heat Rate at HHV of fuel (BTU/kW-Hr)

When the demonstrated percent efficiency applies to the engine only (without

consideration of any downstream energy recovery), the data and calculation shall

be averaged over 15 consecutive minutes and measured within 30 days of the first

emissions compliance test. The actual heat rate in Btu/kW-hr (which can be

converted to Btu/hp-hr by dividing by 1.34 according to the following formula),

shall be measured at peak load for each applicable engine.
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(BTU/kwhr) = (BTU/bhp-hr)

 (1.34)

(b) E= (Mfg Rated Efficiency [Continuous] at LHV)(LHV)

 (HHV)

Engine efficiency shall not be less than 30 percent. An engine with less than a 30

percent efficiency, shall be assigned an efficiency of 30 percent for the purpose of

this rule.

(4) Emission Control Plan

(a) An Emission Control Plan shall be required for those facilities that:

(i) Elect to petition the District for the purpose of aggregating internal

combustion engine emissions in order to comply with emissions

reduction limitations under the percent reduction option in

subsection (C)(2); or

(ii) Cannot meet the requirements in subsection (G)(1) - Compliance

Schedule and intend to justify a claim of impracticability per

subsection (G)(2).

(b) All affected internal combustion engines within the facility shall be

addressed within the Emission Control Plan. Each engine shall be

identified as to which option for emissions compliance applies, i.e. the per

engine ppmv limit, the per engine adjusted ppmv limit, or the per engine

percent reduction limit. The specific designation shall be recorded onto

the ATC/PTO along with any specific operating limits or emissions limits

pertaining to the specific engine, as enforceable permit conditions. 

(c) The Emission Control Plan shall be approved by the Air Pollution Control

Officer (APCO) in writing. For new engines and modifications to existing

engines, the Emission Control Plan shall be submitted to and approved by

the District prior to issuance of the ATC/PTO. The owner/operator may

petition in writing for a change to the Emission Control Plan at any time.

(d) The Emission Control Plan shall include the following (if applicable):

(i) An explanation of why installation of NOx and VOC control

technology cannot be achieved by May 31, 1995; and a schedule

that demonstrates compliance with subsections (C)(1) or (C)(2) by

the earliest practicable date.

(ii) The manufacturer, model number, unit identification (e.g. serial)

number, rated horsepower, and combustion method (i.e., rich-burn

or lean-burn or diesel) of each engine and the fuel type;
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(iii) A description of the emissions control system installed on the

engine (if any), including unit identification (e.g. serial) number,

type (e.g., nonselective catalyst, "clean-burn" combustion, etc.) and

manufacturer, as well as a description of any ancillary equipment

related to the control of emissions (e.g., automatic air/fuel ratio

controller, fuel valves, etc.). The operator shall notify the District

of any replacement of such device(s) and the new serial or

identification numbers.

(iv) The facility, company, Permit to Operate numbers and the location

of the engine by a schematic of the affected facilities.

(v) A specific emission inspection procedure for each engine to ensure

that the engine is operated in strict accordance with the

manufacturer's specifications and in continual compliance with the

provisions of this rule.

(vi) The procedure shall include an operator's inspection schedule. 

(D) Exemptions 

The provisions of this rule shall not apply to:

(1) All internal combustion engines rated at less than 500 brake horsepower.

(2) All internal combustion engines operated less than 100 hours within any

continuous four consecutive calendar quarter period.

(3) Emergency internal combustion engines.

(4) All internal combustion engines located outside the Federal Ozone Nonattainment Area.

Any facility claiming any of the above exemptions shall maintain records in the

manner prescribed by the APCO to provide documentation for compliance

determination.

(E) Monitoring and Records

(1) Monitoring

(a) Operator's of internal combustion engines subject to this rule shall conduct

their inspections, which ever is the more frequent of, at least every

calendar quarter or after every 2,000 hours of engine operation . In no

event shall the frequency of inspection be less than once per year
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(b) Compliance shall be verified at least once in every 12 months, unless

otherwise specified by the District, by an emissions compliance test. At a

minimum, emissions compliance testing shall be conducted for NOx,

VOC, CO and O2 levels in compliance with the provisions of the District's

Compliance Test Procedural Manual.

(2) Recordkeeping Requirements

The operator of any engine subject to the provisions of Section (C) of this rule

shall maintain a log for each engine containing, at a minimum, the following data:

(a) District ATC/PTO number, unit identification number and emissions

control device identification number, when applicable.

(b) Quarterly fuel use and quarterly hours of operation, on a calendar quarter

basis.

(c) The date and a summary of any emissions corrective maintenance taken.

(d) Any additional information required in the facility's District approved

Emission Control Plan, when applicable.

(e) The operator shall maintain the logs on site for a period of 2 years after the

date of each entry. The log shall be provided to the District upon request.

(F) Test Methods

(1) NOx emissions for compliance tests shall be determined by EPA Method 7E.

(2) CO emissions for compliance tests shall be determined by using EPA Method 10.

(3) The measurement of VOC emissions subject to Section (E) of this rule shall be

conducted in accordance with EPA Methods 18, 25 and/or 25A (40 CFR 60,

Appendix A) as they exist on (date of adoption) and test procedures should be

performed in accordance with a protocol approved by the APCO.

(4) Oxygen content for compliance tests shall be determined by using EPA Method

3A.

(5) Determination of the exempt compounds, shall be performed in accordance with

ASTM Test Method D 4457-85 (Solvents and Coatings) and be consistent with

the provisions set forth in the Federal Register (FR, Vol. 56, No. 52, March 18,

1991). Perfluorocarbon compounds shall be assumed to be absent from a product

or process unless a manufacturer or facility operator identifies a specific
MDAQMD RULE 1160

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compound or compounds from the broad classes of perfluorocarbons listed in 40

CFR 51.100(S)(1) as being present in the product or process. When such

compounds are identified, the facility shall provide the test method to determine

the amount(s) of the specific compound(s).

(G) Compliance Schedule

The owner or operator of permit units subject to this rule shall fulfill the following

increments of progress for permit units located in the Federal Ozone Non-attainment

Area:

(1) If a facility files an Emission Control Plan:

(a) for ICEs of 1000 bhp and larger, the plan shall be submitted to the

District not later than January 1, 1995.

(b) for ICEs of 500 bhp and larger, but less than 1000 bhp, the plan

shall be submitted to the District not later than March 15, 1995.

(2) Install control technology that meets the NOx, VOC, and CO emission

standards in (C)(1) or (C)(2) no later than May 31, 1995, unless such

installation was justified to be impracticable in the Emission Control Plan.

(3) For those permit units for which installation by May 31, 1995 is not

practicable, the Emission Control Plan shall demonstrate that actual

control technology shall be installed by the following dates.

(a) Southern California Gas (Newberry Springs Facility)

Southern California Gas shall complete installation of VOC and

NOx control technology on the following internal combustion

engines according to the following schedule:

Engine 1 November 3, 1995

Engine 2 July 12, 1996

Engine 3 March 8, 1996

Engine 4 May 3, 1996

Engine 5 November 22, 1996

Engine 6 January 17, 1997 
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(b) Pacific Gas and Electric (Hinkley Facility)

PG&E shall complete installation on at least the following

percentages of installed engine horsepower at the site, for both

VOC and NOx control technology, according to the following

schedule.

30 percent of installed horsepower November 30, 1996

50 percent of installed horsepower June 30, 1997

Complete installation on all engines June 30, 1998

(4) Demonstrate final compliance with all applicable standards and

requirements of the rule within six months of installation of the emission

control technology.

[SIP: Approved: 11/1/96. 61 FR 56470, 40 CFR 52.220(c)(207)(I)(D)(3)]