DEQ-CFW_00067521

Sands, Heather
From: Johnson, Michael E <[e-mail]>
Sent: Tuesday, June 09, 2015 8:30 AM
To: Sands, Heather .
Cc: McGaughy, Ellis H
Subject: Chemours Fayetteville Permit No. 03735T39 Renewal -- Request for modification of
monitoring condition for ID No. NS-B
Heather:
Since the Title V renewal permit has not been issued yet, Chemours requests the below minor addendum to the
renewal application.
Per your instructions, the facility's Responsible Official, Ellis McGaughy, is a recipient of this email.
We are having problems with one of our vent flow meters in the VE North Process (ID No. NS-B). The actual
flow is on the low end of the dP scale of the meter and we are getting erroneously high flow measurements and
therefore corresponding erroneously high VOC emission rates.
Currently Section 2. 1 (B)(4)(c)(i) states the followings:
i. Using measured vent flow rates and assumed compositions, determine the process vent mass flow rates
of non-acid fluoride VOC (Q„AF) and acid fluoride VOC (QAF) during the previous calendar month (in
lb/month);
This requires us to exclusively use "measured vent flow rates" in lieu of "estimated vent flow rates" using
engineering calculations.
We request this sentence be modified to read:
i. Using measured or estimated vent flow rates and assumed compositions, determine the process vent
mass flow rates of non-acid fluoride VOC (Q„AF) and acid fluoride VOC (QAF) during the previous
calendar month (in lb/month);
This would give us some flexibility and allow us to more accurately estimate the true VOC emission rates.
Thank you for your consideration of this request.
Mike
Michael E. Johnson, PE
Environmental Manager
DuPont Company — Fayetteville Works
[phone]
DEQ-CFW 00067521

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DEQ-CFW 00067522