Approval and Promulgation of Air Quality Implementation Plans; Maryland; Nonattainment New Source Review Requirements for the 2008 8-Hour Ozone Standard
The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of Maryland. The revision is in response to EPA's February 3, 2017 Findings of Failure to Submit for various requirements relating to the 2008 8-hour ozone national ambient air quality standards (NAAQS). This SIP revision is specific to nonattainment new source review (NNSR) requirements. EPA is approving this revision in accordance with the requirements of the Clean Air Act (CAA).
Air Plan Approval; Massachusetts; Revised Format for Materials Being Incorporated by Reference
The Environmental Protection Agency (EPA) is revising the format for materials submitted by the Commonwealth of Massachusetts that are incorporated by reference (IBR) into the Massachusetts State Implementation Plan (SIP). The regulations and other materials affected by this format change have all been previously submitted by Massachusetts and approved by EPA as part of the SIP.
National Emission Standards for Hazardous Air Pollutants: Off-Site Waste and Recovery Operations
This action finalizes amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Off-Site Waste and Recovery Operations (OSWRO). The final amendments address continuous monitoring on pressure relief devices (PRDs) on containers. This issue was raised in a petition for reconsideration of the 2015 amendments to the OSWRO NESHAP, which were based on the residual risk and technology review (RTR). Among other things, the 2015 amendments established additional monitoring requirements for all PRDs, including PRDs on containers. For PRDs on containers, these monitoring requirements were in addition to the inspection and monitoring requirements for containers and their closure devices already required by the OSWRO NESHAP. This final action removes the additional monitoring requirements for PRDs on containers that resulted from the 2015 amendments because we have determined that they are not necessary. This action does not substantially change the level of environmental protection provided under the OSWRO NESHAP, but reduces burden to this industry compared to the current rule by $28 million in capital costs related to compliance, and $4.2 million per year in total annualized costs under a 7 percent interest rate. Over 15 years at a 7-percent discount rate, this constitutes an estimated reduction of $39 million in the present value, or $4.3 million per year in equivalent annualized cost savings.
Approval and Promulgation of Air Quality Implementation Plans; State of Wyoming; Sheridan PM10
The Environmental Protection Agency (EPA) is proposing to fully approve the Limited Maintenance Plan (LMP), submitted by the State of Wyoming to the EPA on June 2, 2017, for the Sheridan moderate PM10 nonattainment area (Sheridan NAA) and concurrently redesignate the Sheridan NAA to attainment of the National Ambient Air Quality Standard (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM10). In order to approve the LMP and redesignation, the EPA is proposing to determine that the Sheridan NAA has attained the 1987 24-hour PM10 NAAQS of 150 [micro]g/m\3\. This determination is based upon monitored air quality data for the PM10 NAAQS during the years 2014-2016. Additionally, the EPA is proposing to approve the Sheridan LMP as meeting the appropriate transportation conformity requirements found in 40 CFR 93, subpart A.