Stewart W. McCollam, P.E.


Important 2015 Ozone NAAQS Update

Stewart W. McCollam, P.E.

On December 20, 2017, Kentucky and other states were notified by EPA of the areas that the Agency intends to designate as nonattainment for the 2015 Ozone National Ambient Air Quality Standard (Ozone NAAQS).  These nonattainment designations are EPA’s preliminary response to the 2016 area recommendations submitted by states and are not final.  Kentucky and […]


Facility Seeks Modification for Emissions of Toxic Air

Stewart W. McCollam, P.E.

A Louisville facility is seeking a modification to the Environmental Acceptability Goals (EAGs) of the Strategic Toxic Air Reduction (STAR) program administered by the Louisville Metro Air Pollution Control District (District). The District has opened a public comment period from March 11, 2017 through April 10, 2017 and scheduled a public hearing in the Board […]


EPA to Remove “Emergency” Affirmative Defense Provisions from Title V Permits

Stewart W. McCollam, P.E.

Consistent with recent actions by EPA to require enforceable emission standards for all periods of stationary source operation (including startup, shutdown, and malfunction), EPA is set to release a final rule in the near future to remove “emergency” affirmative defense provisions in permit language for Title V sources. The proposed rule [81 FR 114 (06/14/2016)] […]


EPA Makes Round 2 Final Area Designations for the 2010 1-Hour SO2 NAAQS: Impacts on Kentucky

Stewart W. McCollam, P.E.

On June 30, 2016 the EPA made its second round of designations for areas as “nonattainment,” “unclassifiable/attainment,” or “unclassifiable” for the 2010 Primary 1-Hour SO2 National Ambient Air Quality Standard (SO2 NAAQS). This round of designations was required to be completed by July 2, 2016 as a result of a consent decree issued by the […]


LOUISVILLE FACES POSSIBLE NONATTAINMENT DESIGNATION WITH THE 2015 OZONE NAAQS

Stewart W. McCollam, P.E.

Monday June 13, 2016 marked the 9th day this year that the Louisville metropolitan area exceeded the 2015 revised National Ambient Air Quality Standard (NAAQS) for ozone of 70 parts per billion (ppb). This ozone season (May 1st – September 30th) started with mild weather for derby week, but the recent heat wave lead to […]


EPA ANNOUNCES NEW DRINKING WATER HEALTH ADVISORY LEVELS FOR PERFLUORINATED CHEMICALS

Stewart W. McCollam, P.E.

The U.S. Environmental Protection Agency (EPA) has just issued a lifetime drinking water health advisory standard of 0.07 micrograms per liter (µg/L) or 0.07 parts per billion (ppb) for the Perfluoroalkyl substances (PFAS) perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) based on a reference dose (RfD) derived from a developmental toxicity study in mice.(1,2) […]


EPA FILES FINAL BRIEF TO U.S. DISTRICT COURT OF APPEALS

Stewart W. McCollam, P.E.

The Environmental Protection Agency (EPA) has filed a final brief with the U.S. Court of Appeals (USCA) for the District of Columbia with oral arguments to be heard on June 2, 2016 for USCA Case #15-1363. The case is being heard on an expedited schedule because the U.S. Supreme Court delayed the implementation of the […]


OZONE STANDARDS IMPLEMENTATION ACT OF 2016

Stewart W. McCollam, P.E.

The House of Representatives Energy and Commerce Committee has been assigned H.R. 4775 Ozone Standards Implementation Act of 2016, a bill that allows states to pursue cost-effective and practical implementation of EPA’s ozone standards. In March of 2008, the EPA revised the National Ambient Air Quality Standard (NAAQS) for ozone; however, due to litigation did not publish […]


Air Dispersion Modeling

Stewart W. McCollam, P.E.

Use of AERMOD for NAAQS Area Designations and State Implementation Plan Submittals


Kentucky Division for Air Quality Sends Emission Inventory Surveys to Permitted Stationary Sources

Stewart W. McCollam, P.E.

On February 22, 2016, the Kentucky Division for Air Quality (DAQ) sent letters to stationary sources that are required to complete a DAQ Web Survey for calendar year 2015 air emissions. The submission must be completed through the online web portal by March 23, 2016. To access the DAQ Web Survey, a stationary source must […]