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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Proposed Rules
attainment date by one year or more.44
Any measures that are necessary to meet these requirements that are not already either federally promulgated, or part of the states SIP, must be submitted in enforceable form as part of the states attainment plan for the area.45
2. Summary of the States Submission For the 2018 Western Nevada County Ozone Plan, the District and CARB each undertook a process to identify and evaluate potential RACM that could contribute to expeditious attainment of the 2008 ozone NAAQS in Western Nevada County. We describe each agencys efforts below.

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a. Districts RACM Analysis The Districts RACM demonstration for the 2008 ozone NAAQS is described in Chapter X, Reasonably Available Control Measures Demonstration, of the 2018 Western Nevada County Ozone Plan. This discussion summarizes the Districts analysis of potential additional control measures for stationary sources conducted in the Districts RACT SIP,46
and describes additional controls in place for areawide source categories, such as architectural and automotive coatings. Chapter X and Appendices B
44 Id. See also 44 FR 20372 April 4, 1979, and memorandum dated December 14, 2000, from John S. Seitz, Director, OAQPS, to Regional Air Directors, titled Additional Submission on RACM
From States with Severe One-Hour Ozone Nonattainment Area SIPs.
45 For ozone nonattainment areas classified as Moderate or above, CAA section 182b2 also requires implementation of RACT for all major sources of VOC and for each VOC source category for which the EPA has issued a control techniques guideline. CAA section 182f requires that RACT
under section 182b2 also apply to major stationary sources of NOX. In Serious areas, a major source is a stationary source that emits or has the potential to emit at least 50 tpy of VOC or NOX see CAA section 182c and f. Under the 2008 Ozone SRR, states were required to submit SIP revisions meeting the RACT requirements of CAA sections 182b2 and 182f no later than 24 months after the effective date of designation for the 2008 Ozone NAAQS and to implement the required RACT
measures as expeditiously as practicable but no later than January 1 of the 5th year after the effective date of designation see 40 CFR
51.1112a. California submitted the CAA section 182 RACT SIP for Western Nevada County for the 2008 ozone NAAQS on June 7, 2018. Although Western Nevada County was classified as Moderate nonattainment for the 2008 ozone NAAQS at the time of submittal, the RACT SIP evaluated the area for compliance with applicable RACT requirements based on the 50 tpy Serious major source thresholds, in anticipation of the areas reclassification to the higher classification. The EPA
found this submission complete on November 29, 2018 see letter dated November 29, 2018 from Elizabeth Adams, Acting Director, Air Divison, EPA
Region IX, to Richard Corey, Executive Officer, California Air Resources Board, and finalized the RACT SIP submission on January 15, 2020 85 FR
2313.
46 The EPA approved the Districts RACT SIP on January 15, 2020. 85 FR 2313.

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D discuss CARBs mobile source and consumer products RACM assessment.
The District concludes that there are no additional control measures reasonably available in the area that can advance attainment by a year or more.
The Districts RACM analysis builds upon a foundation of District rules developed for earlier ozone plans and approved as part of the SIP.47 The District has adopted rules to address various source categories of NOX and VOC. We provide a list of the Districts NOX and VOC rules approved into the California SIP in Table 1 of our December 3, 2020 memorandum to file in the docket for this proposed action.
The SIP-approved District VOC or NOX
rules listed in Table 1 of our memorandum establish emission limits or other types of emissions controls for a wide range of sources, including incinerator burning, orchard or citrus heaters, fossil fuel steam generator facilities, gas stations, and more. These rules have already provided significant and ongoing reductions toward attainment of the 2008 ozone NAAQS
by 2021.
Tables 2 and 3 of the December 3, 2020 memorandum provide a crosswalk of the areas top-emitting stationary and area source categories of NOX and VOC
with related District control rules. As shown in these tables, the areas 2020
stationary and area source emissions inventory includes about 0.23 tpd of NOX and 2.20 tpd of VOC. The top NOX
source categories for this year are residential fuel combustion 0.13 tpd;
4.26 percent of 2020 inventory and service/commercial fuel combustion 0.04 tpd; 1.25 percent of 2020
inventory; all other categories each represent less than 1 percent of the 2020
inventory.48 The top VOC source categories for this year are consumer products 0.44 tpd; 10.28 percent of 2020 inventory, asphalt paving/roofing 0.38 tpd; 8.98 percent of 2020
inventory, and architectural coatings 0.32 tpd; 7.55 percent of 2020
inventory.
The Districts October 26, 2020
commitment letter for contingency measures includes further analysis of potential additional controls for regulated high-emission source categories. As mentioned above, the two largest NOX source categories are residential fuel combustion and service/
commercial fuel combustion. For residential fuel combustion, the District 47 2018

Western Nevada County Ozone Plan, page
42.
48 For a further breakdown of the areas NO and X
VOC sources, see Table 3 of the EPAs December 3, 2020 memorandum to file.

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evaluated Sacramento Metropolitan Air Quality Management District SMAQMD Rule 414 for water heaters, boilers, and process heaters rated less than a million BTU per hour. Based on its analysis, and considering especially the low population in the nonattainment area, the District concluded that potential cumulative reductions in NOX from a similar rule in the District would produce only about 0.0005 tpd each year, and that these reductions would occur too slowly to make any meaningful difference in attainment. For service/commercial fuel combustion, the District evaluated SMAQMD Rule 419 for miscellaneous combustion units. The District concluded that emission reductions from applying Rule 419 controls in the area would be approximately zero, because applying the rule would not be feasible for two of the three sources in the nonattainment area that would be subject to the rule and would not result in a more stringent emissions limit for the last applicable source in the nonattainment area. For VOC
reductions, the District evaluated state measures for architectural coatings and automotive coatings,49 and found that reductions would be equivalent to 0.010
tpd and 0.003 tpd, respectively. The District found that the estimated reductions for automotive coatings was negligible and not cost effective but committed to adopting a rule for architectural coatings as a contingency measure.50
Transportation Control Measures TCMs are projects that reduce air pollutants from transportation sources by reducing vehicle use, traffic congestion, or vehicle miles traveled.
The Nevada County Regional Transportation Plan 20152035
Transportation Plan, prepared by NCTC in January 2018, summarizes and highlights TCMs in Nevada County, including the Western portion of Nevada County, and is included in the docket for this action. Sample measures in Western Nevada County are included within the TCM categories of CAA
section 108f1A. They include proposed bikeways, for example, in Grass Valley,51 a 511 traveler 49 Architectural coatings is Western Nevada Countys third largest VOC source category. The largest VOC source categories in the area are consumer products and asphalt paving/roofing, and they are already regulated, respectively, by multiple CARB regulations and District Rule 227. See Table 3 of our December 3, 2020 memorandum to file.
50 The emission reductions from the adopting an architectural coatings rule for VOC 0.010 tpd is less than the value needed to advance attainment by a year for VOC 0.075 tpd, as calculated below in Section III.C.3.
51 Transportation Plan, Appendix D, page D1.

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