CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 1

(Electronic Format)

I. GENERAL INFORMATION

District: Imperial County Air Pollution Control District

Rule No(s): 400.2 Date adopted/Amended/Rescinded: 02/23/2010

Rule Title(s): Boilers, Process Heaters and Steam Generators

Date Submitted to ARB: March 15, 2010

If an Amended Rule, Date Last Amended (or Adopted): N/A

Is the Rule Intended to be Sent to the U.S. EPA as a SIP Revision? Yes No (If No, do not complete remainder of form)

District Contact: Monica N. Soucier Phone Number: (760) 482-4606 E-mail Address: monicasoucier@co.imperial.ca.us

Narrative Summary of New Rule or Rule Changes: New Rule Amended Rule

Rule 400.2 Boilers, Process Heaters and Steam Generators requires any unit with a rated heat input capacity of 5 

million British Thermal uniter per hour (MMBtu/hr) to meet new NOx limits of 30 parts per million by volume 

(ppmv) for gaseous fuel-fired units and 40 ppmv (0.052 lb/MMBtu) for liquid fuel-fired units. Generally, the limits 

are achievable via low-NOx burners and flue gas recirculation. For those units which do not operate throughout 

the year such as peaking or seasonal units, Rule 400.2 establishes an alternative NOx emissions limit of 70 ppmv 

for those units with an annual capacity factor of 30% or less. The rule also contains NOx thresholds for biomass 

boilers, 120 ppmv at 12% CO2 or as an alternative, biomass boilers will be required to reduce NOx emissions at a 

minimum of 80% of the uncontrolled NOx emissions concentration in the exhaust gas stream. New and existing 

sources that do NOT require modification for compliance must be in full compliance upon adoption of the rule. 

However, for existing sources not in compliance Rule 400.2 allows sources to ease into compliance utlizing a 

compliance schedule which requires full compliance by June 30, 2011. There are 13 units located at three 

Imperial County major source facilities which are affected by this rule. Imperial Irrigation District, United States 

Gypsum, and Spreckles (Holly) Sugar. 

Pollutant(s) Regulated by the Rule (Check): ROG (NOx) SO2

(CO) PM TAC (name):

II. EFFECT ON EMISSIONS

Complete this section ONLY for rules that, when implemented, will result in quantifiable changes in emissions. Attach reference(s) for emission factor(s) 

and other information. Attach calculation sheet showing how the emission information provided below was determined.

Net Effect on Emissions: Increase Decrease N/A

Emission Reduction Commitment in SIP for this Source Category: N/A

Inventory Year Used to Calculate Changes in Emissions: 2008 Area Affected: Imperial County 

Future Year Control Profile Estimate (Provide information on as many years as possible):

According to the Imperial County permit system review and analysis there are 13 units located at three Imperial Conyt 

major source facilities which are impacted by Rule 400.2. The analysis indicated the potential NOx emissions reductions 

resulting from the implementation of Rule 400.2 at 143.3 tons per year. The overall percent reduction from source specific 

baseline per year is approximately 48 percent.
CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 2

(Electronic Format)

Baseline Inventory in the SIP for the Control Measure: N/A

Emissions Reduction Commitment in the SIP for the Control Measure: N/A

Revised Baseline Inventory (if any): N/A

Revised Emission Reduction Estimate (if developed): N/A

Note that the district’s input to the Rule Evaluation Form will not be used as input to the ARB’s emission forecasting and 

planning.

III. SOURCES/ATTAINMENT STATUS

District is: Attainment Nonattainment Split

Approximate Total Number of Small (<100 TPY) Sources Affected by this Amendment: 446

Percent in Nonattainment Area: 100%

Number of Large (> 100 TPY) Sources Controlled: 5 Percent in Nonattainment Area: 100%

Name(s) and Location(s) (city and county) of Large (> 100 TPY) Sources Controlled by Rule (Attach additional sheets as 

necessary): All sources located in Imperial County: Imperial Irrigation DIstrict (Rockwood) Unit 1, Dogwood Road Brawley; 

Imperial Irrigation District, EL Centro; Holly Sugar (Spreckles), Keystone Road Brawley; Imperial Valley Resource 

Recovery, Keystone Road Brawley; United States Gypsum, Plaster City/Ocotillo; 

IV. EMISSION REDUCTION TECHNOLOGY

Does the Rule Include Emission Limits that are Continuous? Yes No

If Yes, Those Limits are in Section(s) C of the Rule.

Other Methods in the Rule for Achieving Emission Reductions are: Compliance with the NOx emission limits in Section C 

shall be determined using United States Environmental Protection Agency (U.S. EPA) Method 7, 7A, 7C, 7E, California 

Air Resources Board (CARB) Method 100, or any other applicable EPA approved test method.

V. OTHER REQUIREMENTS

The Rule Contains:

Emission Limits in Section(s): C Work Practice Standards in Section(s): N/A

Recordkeeping Requirements in Section(s): H Reporting Requirements in Section(s): H
CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 3

(Electronic Format)

5/1/2002

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VI. IMPACT ON AIR QUALITY PLAN

 No Impact Impacts RFP Impacts attainment

Discussion: The new rule is expected to result in the emissions reductions of 0.39 tons per day of NOx. These additional 

reductions will help Imperial County and the air basin maintain attainment of the 1997 ozone standard.