AQ_F_0100010_20221222_CMPL_Fac-Ltr_BypassLtr

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Environmental Quality
Received
DEC 2 2 2022
December 16, 2022 Winston-Salem
Regional Office
Davis Murphy Pam,
Compliance Supervisor
NCDAQ
450 West Hanes Mill Road, Suite 300
Winston-Salem, North Carolina 27105
RE: Notification of Malfunction Event
Stericycle, Inc. — Haw River, NC Facility
Permit No. O5896T25
Dear Mr. Murphy:
Stericycle, Inc. owns and operates a hospital, medical, and infectious waste incinerator
(HMIWI) facility in Haw River, NC (Haw River facility) pursuant to Permit No. 05896T25
(Title V Permit) issued by the North Carolina Department of Environmental Quality
(NCDEQ). This letter provides a written report detailing the recent malfunction event
resulting in use of the bypass stack that occurred on December 12, 2022 Notification of
the event was made to your office via telephone on the following day.
The malfunction event occurred on Unit 1. The bypass stack cap was open for a total of
approximately 6 minutes from 6:06 pm until 6:12 pm.
Stericycle has determined that the malfunction was due to a fault in the newly installed
PLC logic. Due to the fault, the entire control system failed, causing the bypass stack to
open. During the bypass, the unit was 1 hour into a burndown and planned shutdown,
therefore no waste was being charged into the incinerator. After the shutdown was
completed, the facility investigated, identified the cause, and reprogrammed the logic.
The new logic was tested and the incinerator was restarted to resume normal operation.
The event was not attributable to a failure to adhere to the facility's Bypass Reduction
Plan. Stericycle has maintained and operated the facility in accordance with good practices
for minimizing emissions, and actions were taken expeditiously to minimize the duration
of the malfunction and any excess emissions. Due to the event occurring during a
shutdown, any excess emissions would have already been minimal.
stericycle.com

Stericycher We protect what matters.
Stericycle maintains that this incident is not part of a recurring pattern of inadequate
design, operation, or maintenance. Thus, under 15A NCAC 02D .0535(c), any excess
emissions that may have occurred would not be considered a violation of any emissions
standards.
Please feel free to contact me at [phone] if you have questions regarding this
submittal.
Sincerely,
ericycle, Inc.
'D n Nuss
Regional Compliance Manager
cc: Dale Rich — Stericycle
stericycle.com