1/06 RULE 74.9 : 1 VENTURA COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 74.9 - STATIONARY INTERNAL COMBUSTION ENGINES (Adopted 7/21/81, Revised 7/2/85, 9/ 5/89, 12/3/91, 12/21/93, 11/14/00, 11/8/05)

A. Applicability

This rule applies to any stationary spark-ignite d or diesel internal co mbustion engine rated at 50 or more horsepower, operated on any gaseous fuel, includi ng liquid petroleum gas (LPG), or liquid fuel, and not subject to the provisions of Rule 74.16.

B. Requirements

1. Except as noted in Subsection B.1.a, the ow ner or operator of a stationary internal combustion engine to which this rule is applicable shall limit emissions from that engine to no more than the following:

Engine Type NOx ROC CO (ppmv) (ppmv) (ppmv)

Rich-burn, general 25 250 4500 Lean-burn, general 45 750 4500

Diesel 80 750 4500 Rich-burn, waste gas 50 250 4500 Lean-burn, waste gas 125 750 4500

where ppmv = parts per million by volume at 15 percent oxygen on a dry basis NOx = oxides of nitrogen ROC = reactive organic compounds

CO = carbon monoxide

a. Carbon monoxide emissions from an y engine installed after November 8, 2005, shall be limited to 2000 ppm by volume at 15 percent oxygen on a dry

basis.

2. In lieu of compliance with a NOx e mission limit in Subsection B.1, engines may achieve and maintain a percent NOx reduction by weight limit specified below, as measured concurrently across an emission control device:

Rich-burn, general 96 percent Lean-burn, general 94 percent Diesel 90 percent

3. No person shall allow the discharge into the atmosphere of ammonia (NH 3 ) in excess of 20 ppmv from any emission control device installed and operate d pursuant to the requirements of Subsecti ons B.1 or B.2 above.1/06 RULE 74.9 : 2 4. The owner or operator of a stationary in ternal combustion engine shall perform a biennial source test to verify compliance with all applicable emission limits. A source test shall consist of the average of three (3) runs, with data from each run averaged over 15 consecutive minutes.

5. The owner or operator of a stationary in ternal combustion engine shall perform a screening analysis of NOx and CO e missions on a quarterly basis unless:

a. the biennial source test specified in Subsection B.4 is required, or

b. the engine operated less than 32 hours in each of the three months of the applicable quarter, as measured by a non-resettable elapsed operating hour

meter.

The operator shall notify the APCD by telephone 24 hours prior to any quarterly screening analysis.

C. Engine Operator Inspection Plan

The operator of an engine subject to the provisi ons of Subsection B.1 or B.2 of this rule shall submit to the District an Engine Operator Inspection Plan for review and approval by the Air Pollution Control Officer in writing. The pl an shall be updated after any change in operation. For new engines and modifications to existing engines, issuance of the Permit to Operate shall be contingent on approval of the plan. The opera tor may request a change to the plan at any time.

The Plan shall include the following:

1. The manufacturer, model number, rate d horsepower, and com bustion method (i.e., rich-burn, lean-burn or diesel) of the engine.

2. A description of the NOx control system installed on the engine (if any), including type (e.g., nonselective catalyst, "clean-bur n" combustion) 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).

3. The company identification number and the location of the engine by a schematic of

the affected facilities.

4. A specific emission inspection procedure to assure that the engine is operated in continual compliance with the provisions of th is rule. The procedure shall include an inspection schedule. At a minimum, inspec tions shall be conduc ted quarterly unless the engine operated less than 32 hours in each of the three months of the applicable quarter, as measured by a non-rese ttable elapsed opera ting hour meter.

5. Each preventative or corrective maintenance procedure or practice that will be used to maintain the engine and NOx control system in continual compliance with the1/06 RULE 74.9 : 3 provisions of this rule, including the response time for both corrective action and reinspection.

D. Exemptions

The provisions of Sections B, C and E of th is rule shall not appl y to the operation of stationary internal combustion engine s used under the following conditions:

1. Engines rated at less than 50 brake horsepower.

2. Engines operated less th an 200 hours per calendar year. Engines claiming this exemption shall be required to install a nd operate a non-resetta ble elapsed operating

hour meter.

3. Emergency standby engine s operated during either an emergency or maintenance operation. Maintenance opera tion is limited to 50 hours per calendar year. Engines claiming this exemption shall be require d to install and ope rate a non-resettable elapsed operating hour meter.

4. Engines used in research or teaching programs.

5. Engines used directly and exclusively for agricultural operations necessary for the growing of crops or the raising of fowl or animals.

6. Engine test stands used fo r evaluating engine performance.

7. All engines rated at less than 100 hor sepower, emitting NOx at not more than 5 gm/bhp-hr (shaft), and utilized as a qua lified cogeneration f acility permanently displacing the use of a specifi ed boiler or boilers. This exemption shall apply to only those engines installed prior to Decembe r 31, 1988. A qualified co generation facility is one meeting the requirements of 18 CFR Part 292 Subpart B Section 292.205.

8. Diesel engines with a permitted capacity factor of 15 percent or less.

9. Diesel engines used to power cranes and welding equipment.

10. Diesel engines operated on Sa n Nicolas island and Anacapa Island.

E. Recordkeeping Requirements

1. The owner or operator of any engine subj ect to the provisions of Section B of this rule shall maintain an inspection log containing, at a minimum, the following data:

a. Identification and location of each engine subject to the provisions of this rule,

b. Date and results of each sc reening analysis and inspection,1/06 RULE 74.9 : 4 c. A summary of any emissions corrective maintenance taken, and

d. Any additional information required in the Engine Operator Inspection Plan.

The operator shall maintain the inspection log for a period of 2 years after the date of each entry. The log shall be available for inspection by the District upon request.

2. For each engine exempt from quarterly screening analysis pursuant to Subsection B.5.b and inspection pursuant to Subsection C.4, the owner or operator shall record total hours of operation each month. Records shall be maintained for a period of 2 years after the date of each entry.

F. Reporting Requirements

1. Within 45 days of the end date of each permit renewal peri od, the operator of a permitted engine subject to the provisions of this rule shall provide the District with the following information:

a. Engine manufacturer, model numbe r, operator identification number, and

location.

b. A summary of maintenance reports during the renewal period, including quarterly screening data if applicable.

2. For each engine exempt pursuant to Subsection D.2, total annual operating hours shall be reported annually. For each engine exempt pursuant to Subsection D.3, total annual hours of maintenance ope ration shall be reported a nnually. Reports shall be provided to the District after ev ery calendar year by February 15.

. G. Test Methods

1. Oxides of nitrogen emissions for complia nce source tests sha ll be determined by using ARB Method 100.

2. Carbon monoxide emissions for complian ce source tests shall be determined by using ARB Method 100.

3. Reactive organic compound emissions for compliance source tests shall be determined by using EPA Method 25 or EPA Method 18, referenced to methane.

4. Oxygen content for compliance source te sts shall be determined by using ARB

Method 100.

5. Screening analyses shall be performed using a portable analyzer either verified by the Environmental Protection Agency or approved in writing by the APCO. The1/06 RULE 74.9 : 5 portable analyzer shall be calibrated, maintained and operated in accordance with the

recommendations of the manufacturer.

6. Ammonia emissions shall be determined using Bay Area Air Quality Management District Method ST-1B, dated 1/20/82.

7. Non-resettable elapsed opera ting hour meters sha ll be maintained in accordance with

the recommendations of the manufacturer.

H. Violations

1. Failure to comply with any provision of this Rule shall constitute a violation of this

rule.

2. It is the responsibility of the engine opera tor to demonstrate to the satisfaction of the Air Pollution Control Officer that an engine subject to the provisions of this rule is being operated in continuous co mpliance with all applicable provisions of this rule.

An engine shall be in violation if it is operated out of complia nce with an approved Engine Operator Inspection Plan. However, if data from a source test of the engine operating under identical conditi ons indicates that the engine is in compliance with the requirements of this rule, then a violation will not have occurred. The source test

shall be conducted at the en gine operator's expense.

I. Definitions

1. "Diesel Engine": A compression ignited tw o or four-stroke engine in which liquid fuel injected into the combustion chambe r ignites when the air charge has been compressed to a temperature suffi ciently high for auto-ignition.

2. "Emergency Standby Engine": An intern al combustion engine used only as follows:

a. When normal power line or natural gas service fails. b. For the emergency pumping of water fo r either fire protec tion or flood relief.

An emergency standby engine may not be operated to supplement a primary power source when the load capacity or rating of the primary power source has been either

reached or exceeded.

3. "Engine Rating": The output of an engine as determined by the engine manufacturer and listed on the nameplate of the unit, regardless of any derating.

4. "Lean-burn Engine": Any two or four-stroke spark-ignited engine that is not a richburn engine.1/06 RULE 74.9 : 6 5. "Maintenance Operation": The use of an emergency standby engine and fuel system during testing, repair and routine maintenance to verify its readiness for emergency standby use, or to facilitate the trai ning of personnel on emergency activities.

6. "Oxides of Nitrogen": The sum of nitr ic oxide (NO) and nitrogen dioxide (NO 2 ) in flue gas, collectively expressed as nitrogen dioxide.

7. "Permitted Capacity Factor": The a nnual permitted fuel use divided by the manufacturers specified maximum hourly fuel consumption times 8760 hours per

year.

8. "Rich-burn Engine": A two or four-s troke spark-ignited engine where the manufacturers original r ecommended operating air/fuel ratio divided by the

stoichiometric air/fuel ratio is less than or equal to 1.1.

9. "Stationary Internal Combustion Engine": Any internal combustion engine of the reciprocating type that is opera ted at a site for more than one year or is attached to a

foundation.

10. "Stoichiometric Air/Fuel Ratio": The chemi cally correct air/fuel ratio where all fuel and all oxygen in the air/fuel mixture will be consumed.

11. "Waste Gas": Fuel gas produced at either waste water/sewage treatment f acilities or landfills containing no more than 25 percent by volume supplemental gas.