UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

REGION IX AIR DIVISION

Technical Support Document

for

EPA’s Direct Final Rulemaking

for the

California State Implementation Plan

YOLO-SOLANO AIR QUALITY MANAGEMENT DISTRICT

Rule 1.1, General Provisions and Definitions

Prepared by: Arnold Lazarus

Reviewed by: Andy Steckel

April 2016
RULE IDENTIFICATION

Agency Yolo-Solano Air Quality Management District (YSAQMD)

SIP Approved 

Rule

Rule 1.1 - General Provisions and Definitions

Adopted - August 13, 1997

Submitted - July 26, 2000

EPA Approved - March 22, 2004 (69 FR 13234)

Subject of this 

TSD Rule 1.1 - General Provisions and Definitions

Revised - July 8, 2015

Submitted - November 13, 2015

Completeness 

Finding

Determination of Completeness letter: January 19, 2016

BACKGROUND AND SUMMARY – Yolo-Solano Air Quality Management District

(YSAQMD) Rule 1.1, “General Provisions and Definitions,” contains definitions for

specific terms applicable to all YSAQMD rules. EPA most recently approved a

version of Rule 1.1 in 2015. The revisions incorporated in the version submitted July 

8, 2015, add several exempt organic compounds to coincide with those that EPA

has determined to have negligible photochemical reactivity as listed in Title 40 of the

Code of Federal Regulations Part 51.100 (40 CFR 51.100). As stated in the

YSAQMD Staff Report prepared for the latest revisions, “Rule 1.1 will be revised to 

update the list of exempt compounds in section 219, consistent with compounds 

exempted by the US EPA.”1 The revision adds the following compounds to the list of 

exempt compounds:

1. 2,3,3,3-tetrafluoropropene (HFO-1234yf)

2. Trans-1-chloro-3,3,3-trifluoroprop-1-ene (HFO-1233zd(E))

3. 2-Amino-2-methyl-1-propanol (AMP)

EVALUATION CRITERIA –

1. Enforceability - The Bluebook (Issues Relating to VOC Regulation Cutpoints, 

Deficiencies, and Deviations, EPA, May 25, 1988) and the Little Bluebook 

(Guidance Document for Correcting Common VOC & Other Rule 

Deficiencies, EPA Region 9, August 21, 2001) were used to help evaluate 

compliance with the CAA §110(a)(2)(A) requirement for enforceability. 

2. Stringency - SIPs must require Reasonably Available Control Technology 

(RACT) for each category of sources covered by a Control Technique 

1 Final Staff Report, “Proposed revisions to Rule 1.1, General Provisions and Definitions,” June 22,

2015. P3.

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Guideline (CTG) document as well as each major source in ozone 

nonattainment areas (see sections 182(b)(2) and 182(f)).

3. SIP Relaxation - CAA §110(l) prohibits EPA from approving any SIP revision 

that would interfere with any applicable requirement concerning attainment 

and reasonable further progress (RFP) or any other applicable requirement of 

the CAA. In addition, CAA §193 prohibits the modification of any SIPapproved control requirement in effect before November 15, 1990, in a 

nonattainment area.

EPA EVALUATION

These revisions do not have a direct effect on air pollution emissions, but they

improve clarity and enforceability of other YSAQMD rules which do reduce

emissions. Since Rule 1.1 has been approved into the SIP, we are only reviewing 

the portions of the rule that have been amended since our approval. These 

amendments add organic compounds to the list of exempted organic compounds 

that EPA has determined to have negligible photochemical reactivity.

EPA’s criteria for rule approval are satisfied for the following reasons:

1. Enforceability - The amended definitions are clear and help make other 

provisions enforceable, so they are consistent with enforceability requirements

of the federal Clean Air Act (CAA) §110(a)(2)(A).

2. Stringency - The rule does not directly establish emission controls, so it is

not relevant to evaluate it regarding CAA §182(b)(2) RACT or other criteria for 

rule stringency.

3. SIP Relaxation - Because the amendments only provide clarification to

requirements found elsewhere and will not have an effect on air quality, we

have determined that they will not interfere with any applicable requirement

concerning attainment and RFP or any other applicable requirement of the

Act (CAA §110(l)) or modify, in a nonattainment area, any SIP-approved

control requirement in effect before November 15, 1990 (CAA §193).

RECOMMENDED ACTION

EPA staff recommends approval of YSAQMD Rule 1.1 under CAA §110(k) as

meeting the requirements of CAA §110(a) and Part D. Approval of the definitions

should not be interpreted as EPA approval of the other rules in which these

definitions are used.

References

1. Final Staff Report, "”Proposed revisions to Rule 1.1, General Provisions

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and Definitions,” YSAQMD, June 22, 2015.

2. District Rule 1.1, “General Provisions and Definitions,” Clean

Copy, YSAQMD, submitted November 13, 2015.

3. District Rule 1.1, “General Provisions and Definitions,” Strikeout

Copy, YSAQMD, submitted November 13, 2015.

4. Code of Federal Regulations, Title 40, Chapter C, Part 51, Subpart F, 

Section 51.100, “Definitions” (40 CFR 51.100).

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