CALIFORNIA AIR RESOURCES BOARD 

APCD/AQMD RULE EVALUATION FORM – Page 1 

(Electronic Format) 

I. GENERAL INFORMATION 

District: SJVUAPCD 

Rule No(s): 4308 Date adopted/Amended/Rescinded: Amended November 14, 2013 

Rule Title(s): Boilers, Steam Generators, and Process Heaters--0.075 MMBtu/hr to less than 2.0 MMBtu/hr 

Date Submitted to ARB: December 6, 2013 

If an Amended Rule, Date Last Amended (or Adopted): Last Amended December 17, 2009 

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: Chelsea Gonzales Phone Number: (559) 230-6100 E-mail Address: Chelsea.Gonzales@valleyair.org 

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

Amendments to Rule 4308 satisfy a control measure commitment included in the District's 2012 PM2.5 Plan. The 

amendments to Rule 4308 incorporate a lower NOx emission limit for instantaneous water heaters with a rated 

heat input of 0.075-0.4 MMBtu/hr. There are also several administrative amendments to clarify rule applicability 

and to remove outdated and redundant language. 

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: reductions not specified 

Inventory Year Used to Calculate Changes in Emissions: 2015 Area Affected: SJV Air Basin 

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

Cumulative NOx Emission Reductions (tons per year)- 2019: 0.34 tpy, 2024: 0.76 tpy, 2029: 1.25 tpy, 2034: 1.82 tpy 
 

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: not specified 

Revised Baseline Inventory (if any): 2.92 tpy 

Revised Emission Reduction Estimate (if developed): 1.82 tpy upon full rule implementation 

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: N/A

Percent in Nonattainment Area: 100% 

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

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

necessary): N/A 

IV. EMISSION REDUCTION TECHNOLOGY 

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

If Yes, Those Limits are in Section(s) 5.0 of the Rule. 

Other Methods in the Rule for Achieving Emission Reductions are: N/A 

V. OTHER REQUIREMENTS 

The Rule Contains: 

Emission Limits in Section(s): 5.0 Work Practice Standards in Section(s): 6.0 

Recordkeeping Requirements in Section(s): 6.0 Reporting Requirements in Section(s): 6.0 
 

5/1/2002 

CALIFORNIA AIR RESOURCES BOARD 

APCD/AQMD RULE EVALUATION FORM - Page 3 

(Electronic Format) 

VI. IMPACT ON AIR QUALITY PLAN 

 No Impact Impacts RFP Impacts attainment 

Discussion: Rule 4308 is the District’s point-of-sale rule for boilers, steam generators, and process heaters with a rated 

heat input capacity of 0.075 to less than 2.0 million British thermal units per hour (MMBtu/hr). In the District’s 2012 PM2.5 

Plan, the District committed to further reduce emissions from this source category by lowering the NOx emission limit for 

natural gas-fired instantaneous water heaters with a rated heat input of 0.075-0.4 MMBtu/hr (instantaneous units). Rule 

amendments lower the NOx emission limit for these instantaneous units from 55 ppmv to 20 ppmv, effective on and after 

January 1, 2015. Amendments satisfy the commitment included in the 2012 PM2.5 Plan and will contribute to the Valley’s 

progress towards attainment of federal air quality standards for PM2.5 and ozone by reducing NOx emissions.