2024-18458. Air Plan Revisions; Arizona; Maricopa County Air Quality Department

Table 1—Submitted Rules

Local agency	Rule #	Rule title	Revised	Submitted
MCAQD	350	Storage and Transfer of Organic Liquids (Non-Gasoline) at an Organic Liquid Distribution (OLD) Facility	11/18/2020	12/03/2020
MCAQD	351	Storage and Loading of Gasoline at Bulk Gasoline Plants and at Bulk Gasoline Terminals	11/18/2020	12/03/2020

On June 3, 2021, the SIP submittal containing the documents listed in Table 1 was deemed complete by operation of law.

B. Are there other versions of these rules?

We conditionally approved earlier versions of Rule 350 and Rule 351 into the SIP on February 26, 2020 (85 FR 10986). In order to fulfill the commitment the MCAQD made as part of our prior conditional approval, the MCAQD adopted revisions to the SIP-approved versions on November 18, 2020, and ADEQ submitted them to the EPA on December 3, 2020. The February 26, 2020 conditional approval, and an explanation of how the SIP submittal proposed for approval here addresses the deficiencies identified in the conditional approval, are discussed in more detail below. If we finalize this proposal to approve the November 18, 2020 versions of these rules, then these versions will replace the previously approved versions of these rules in the SIP.

C. What is the purpose of the submitted rule revisions?

Emissions of VOC contribute to the formation of ground-level ozone, which harms human health and the environment. Section 110(a) of the CAA requires States to submit plans that provide for implementation, maintenance, and enforcement of the NAAQS. In addition, CAA section 182(b)(2) requires that SIPs for ozone nonattainment areas classified as “Moderate” or higher implement RACT for sources covered by a control techniques guidelines (CTG) document. The MCAQD regulates a portion of the Phoenix-Mesa area designated as nonattainment for ozone and classified as Moderate nonattainment for the 2008 ozone NAAQS.^[1] Therefore, the MCAQD is required to submit SIP revisions that implement RACT-level controls for all sources covered by a CTG. The MCAQD submitted Rule 350 and Rule 351 to establish RACT-level controls for VOC emissions from sources covered by the petroleum liquid and gasoline storage and transfer CTGs. Rule 350 limits VOC emissions from organic liquid storage tanks and VOC emissions during transfer operations at organic liquid distribution facilities. Rule 351 limits VOC emissions from storage and loading of gasoline at bulk gasoline plants and bulk gasoline terminals. The associated CTGs are shown in Table 2.

Table 2—Rules and Associated CTGs

MCAQMD rule	Associated CTGs
Rule 350	Control of Volatile Organic Emissions from Storage of Petroleum Liquids in Fixed-Roof Tanks (EPA-450/2-77-036).
	Control of Volatile Organic Emissions from Petroleum Liquid Storage in External Floating Roof Tanks (EPA-450/2-78-047).
Rule 351	Control of Volatile Organic Emissions from Storage of Petroleum Liquids in Fixed-Roof Tanks (EPA-450/2-77-036).
	Control of Volatile Organic Emissions from Petroleum Liquid Storage in External Floating Roof Tanks (EPA-450/2-78-047).
	Control of Hydrocarbons from Tank Truck Gasoline Loading Terminals (EPA-450/2-77-026).
( print page 67016)
	Control of Volatile Organic Emissions from Bulk Gasoline Plants (EPA-450/2-77-035).