Daniel Hardin, P.E.


Proposed KY Regulations out for Public Comment (DAQ)

Daniel Hardin, P.E.

Proposed regulations for control of emissions from indirect heat exchangers were recently filed by the Kentucky Division for Air Quality (DAQ) on September 14, 2017.  The regulations are revisions of existing regulations for both existing and new indirect heat exchangers.  “Indirect heat exchanger” means a piece of equipment, apparatus, or contrivance used for the combustion […]


Changes: Louisville Air Emission Inventory forms

Daniel Hardin, P.E.

Facilities located within Jefferson County who are required to report emissions to the LMAPCD need to know that the District has changed forms and approaches for the annual emissions inventory. A complete emissions inventory must be submitted by April 15th for the previous calendar year of operations. This summary highlights the revisions to emissions inventory […]


DNA of Anammox Bacteria used for Shortcut Nitrogen Removal

Daniel Hardin, P.E.

Anammox bacteria is the active “ingredient” for shortcut nitrogen removal or deammonification.  The anaerobic ammonia oxidizing bacteria (“AnAOB” or “anammox”) convert ammonia directly to nitrogen gas, which is a shortcut method to traditional methods that require additional steps such as oxidizing ammonia to nitrite and nitrate (nitrification) followed by nitrate and nitrite reduction to nitrogen […]


EPA Requires Energy Producers to Reduce Methane

Daniel Hardin, P.E.

The EPA has issued a final rule for federal standards to reduce methane emissions from new oil and natural gas wells.  The rule will require energy producers to monitor and limit fugitive emissions during production and transmission of natural gas.  Additionally, regular inspections will also be required for the purpose of finding and correcting methane […]


Chicago’s Giant Overflow Basin

Daniel Hardin, P.E.

7.9 billion gallons is a lot of water. That is the expected storage capacity of the Thornton Composite Reservoir, another addition to the Metropolitan Water Reclamation District of Chicago’s Tunnel and Reservoir Plan (TARP) to manage stormwater and control wet weather overflows. The massive size of the hole cut into dolomite limestone is a marvel […]


EPA Enforcement for FY 2015

Daniel Hardin, P.E.

EPA has released their annual results of enforcement, referred to as accomplishments, for fiscal year 2015. The agency estimates a value of $7.3 billion to comply with actions taken in response to their enforcement actions. An additional $3.8 billion would have been added to the $7.3 billion total if a number of large cases lodged […]


EPA to Update Stormwater Urban Runoff Rules

Daniel Hardin, P.E.

EPA has agreed to update the federal regulations for permitting stormwater runoff by November 2016. The proposed rules are intended to strengthen existing regulations for communities with populations less than 100,000 people. The agreement by EPA is a result of a lawsuit filed in the U.S. Court of Appeals for the Ninth Circuit (San Francisco) in December 2014 in […]


Water Quality Sleuths: Hot on the Trail for E. coli, B-theta fecal bacteria

Daniel Hardin, P.E.

Water quality scientists are taking advantage of new laboratory technology that allows them to more accurately trace the origins of bacteria levels in streams. New deep sequencing technologies are available to help scientists track the origin of fecal bacteria such as E. coli, B-theta and others.  New DNA deep-sequencing technology will help in determining how […]


Tennessee Tests a New Silt Fence Product

Daniel Hardin, P.E.

The Tennessee Department of Transportation has conducted tests over an eight month period on the performance of a new silt fence product. Silt-Saver Inc. is the name of the company that produces the Staged Release Silt Fence (SRSF).  The study site was along interstate I-65 near Franklin, TN.  Testing was completed by the end of […]


Testing of fish from the Ohio River (Louisville to Paducah) demonstrates safe mercury levels

Daniel Hardin, P.E.

Mercury levels in fish are not as high as previously estimated.  The water quality standard for mercury is based on methyl mercury (CH3Hg+), which is the bioavailable fraction of total mercury.  The current standard for methyl mercury is 0.3 mg/Kg and was developed for safe human consumption of fish.  (Excess mercury is a health concern […]