**UNITED STATES ENVIRONMENTAL PROTECTION AGENCY**

**REGION IX AIR DIVISION**

Technical Support Document

for

EPA=s Notice of Proposed Rulemaking and Direct Final Rule

for the

California State Implementation Plan

San Joaquin Valley Unified Air Pollution Control District

Rule 4905, Natural Gas-Fired, Fan-Type Residential Central Furnaces

Prepared by: Francisco Dóñez

February 2007

+----------------------+-----------------------------------------------+
| **AGENCY NAME:**     | San Joaquin Valley Unified Air Pollution      |
|                      | Control District (SJVUAPCD)                   |
+----------------------+-----------------------------------------------+
| **SUBMITTED RULE:**  | Rule 4905, Natural Gas-Fired, Fan-Type        |
|                      | Residential Central Furnaces                  |
|                      |                                               |
|                      | Adopted: October 20, 2005                     |
|                      |                                               |
|                      | Submitted: March 10, 2006                     |
|                      |                                               |
|                      | Complete: March 30, 2006                      |
+----------------------+-----------------------------------------------+
| **PREVIOUS RULE      | This is the first submittal of Rule 4905.     |
| SUBMITTALS:**        |                                               |
+----------------------+-----------------------------------------------+
| **SIP-APPROVED       | This is a new rule. No previous versions of   |
| RULE:**              | Rule 4905 have been approved into the State   |
|                      | Implementation Plan (SIP).                    |
+----------------------+-----------------------------------------------+

**RULE SUMMARY**

The purpose of SJVUAPCD Rule 4905 is to limit emissions of oxides of
nitrogen (NOx) from natural gas-fired, fan-type residential central
furnaces with a rated heat input capacity of less than 175,000 Btu per
hour, or a cooling capacity of less than 65,000 Btu per hour for
combination heating and cooling units. The rule's compliance date is
January 1, 2007.

[Rule provisions]{.underline}

-   Rule 4905 imposes an emission limit of 0.093 pounds NOx per million
    Btu of heat output or 55 ppm NOx at 3.00% O~2~ stack gas by volume
    (dry) on units to be used in the District.

-   Units installed in manufactured homes, units using fuels other than
    natural gas, and nonfan-type residential central furnaces are exempt
    from Rule 4905 requirements.

-   The rule contains requirements for demonstrating a unit's certified
    emissions levels.

-   The rule requires that compliance testing records be maintained by
    the manufacturer for five years and made available to the APCO upon
    request.

**RULE EVALUATION**

Generally, SIP rules must be enforceable (see section 110(a) of the
Clean Air Act), must require Reasonably Available Control Technology
(RACT) for major sources in ozone nonattainment areas (see section
182(a)(2)(A)), and must not relax existing requirements (see sections
110(l) and 193). The San Joaquin Valley is an "extreme" ozone
nonattainment area; therefore Rule 4307 must fulfil RACT. The San
Joaquin Valley is also a "serious" PM-10 nonattainment area, and is thus
required under sections 189(b)(1)(B) and 189(e) of the Act to implement
Best Available Control Measures (BACM) (which includes Best Available
Control Technology or BACT) for control of PM-10 precursor emissions,
including NOx.

Documents used to evaluate the rule include the following: EPA's *Issues
Relating to VOC Regulation Cutpoints, Deficiencies, and Deviations* (May
25, 1988, the \"Bluebook\"); EPA Region IX=s *Guidance Document for
Correcting Common VOC and Other Rule Deficiencies* (August 21, 2001, the
ALittle Bluebook@); and the EPA's *State Implementation Plans; Nitrogen
Oxides Supplement to the General Preamble for the Implementation of
Title I of the Clean Air Act Amendment of 1990* (the "NOx Supplement to
the General Preamble") (57 FR 55620, November 25, 1992).

The provisions of Rule 4905 are consistent with the relevant
requirements under section 110(a) and part D of the Clean Air Act as
amended in 1990. Specifically, we find that Rule 4905 implements RACT as
required for moderate and above ozone nonattainment areas under CAA
sections 182(b)(2) and 182(f), RACM/RACT as required for moderate and
above PM-10 nonattainment areas under CAA sections 189(a)(1)(C) and
189(e), and BACM/BACT as required for serious PM-10 nonattainment areas
under CAA sections 189(b)(1)(B) and 189(e) for NOx emissions from the
source category of natural gas-fired, fan-type residential central
furnaces. The NOx emission limit in Rule 4905 matches the most stringent
limit (0.093 lb/MMBtu) that has been adopted by air districts in this
source category.

[Emissions Reductions]{.underline}

The staff report for Submitted Rule 4905 indicates emissions reductions
of 0.251 tons per day by 2020.

**RECOMMENDED ACTION**

EPA staff recommends full approval of submitted SJVUAPCD Rule 4905.

**ATTACHMENTS**

1.  SJVUAPCD Rule 4905, Natural Gas-Fired, Fan-Type Residential Central
    Furnaces, adopted October 20, 2005.

2.  U.S. EPA. *Issues Relating to VOC Regulation Cutpoints,
    Deficiencies, and Deviations*. May 25, 1988 (the \"Bluebook,\" cover
    only).

3.  U.S. EPA Region IX. *Guidance Document for Correcting Common VOC &
    Other Rule Deficiencies*. August 21, 2001 (the \"Little Bluebook,\"
    cover only).

4.  *State Implementation Plans; Nitrogen Oxides Supplement to the
    General Preamble for the Implementation of Title I of the Clean Air
    Act Amendment of 1990* (the "NOx Supplement to the General
    Preamble"), U.S. EPA, 57 FR 55620, November 25, 1992.