From: 
Jones, DonnaLee <Jones.Donnalee@epa.gov>
Sent:
Friday, May 8, 2020 7:10 PM
To: 
Katie.Kistler@aksteel.com; Chris.Potts@aksteel.com
Cc:
Raymond, Gabrielle <graymond@rti.org>
Subject: 
EPA comments on QA file-AKS-Middletown


Hello Katie and Chris,
 
Thank you for providing missing data and also for reviewing and correcting responses for the Coke Oven Enclosure 2 Middletown, OH data.
 
We have reviewed your QA revisions and have a few questions. 
Please see the `Questions for Facility' Tab in the attached file, which is the QA file you sent me with added EPA comments.
 
We have specific comments in Column BL of the `A-1. Air Stack Tests' tab. Please review these comments and provide the reason/rationale/equation for changes to concentration and emission rate values in Column BJ of the `A-1. Air Stack Tests' tab.
 
In Columns BO and BS we have calculated the percent difference from the original reported value to the industry revised values. Please provide reason/rationale/equation for changes in data that have >5% differences (in RED highlight). 
 
In response to your note about certain rows being duplicates of D/F values, these are not duplicates but the calculated toxicity equivalence (TEQ) values. They were calculated by multiplying each individual D/F congener by the appropriate Toxic Equivalency Factor (TEF) value. See the calculations in the `A-3 DF TEQ' tab.
 
The dioxin/furan concentration and emission rate values in the `A-3 DF TEQ' tab were calculated starting with the laboratory reported mass values. Those values were then copied ("paste special" for values only, no algorithms), into the main `A-1. Air Stack Tests' tab for industry review. You can review the `A-3 DF TEQ' tab for any errors that need to be updated. 
 
Please review this file and provide your comments back to me by June 8, 2020. If you have any problems or need more explanation, let me know by email.
 
Regards,
Donna Lee Jones, Ph.D.
Senior Technical Advisor, Metals Sector
U. S. Environmental Protection Agency
Office of Air Quality Planning and Standards
Sector Policies and Programs Division / Metals & Inorganic Chemicals Group (D243-02)
Research Triangle Park, NC  27711  Tele:  (919)  541-5251  Fax  (919)  541-3207
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Reasonableness never fails to be appreciated."  - anon



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