NC0026441_NOV-2024-LV-0317_20240520

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Public works and Utilities
May 07, 2024
Attn: Vanessa E. Manuel, Assistant Regional Supervisor
1617 Mail Service Center
Raleigh, NC 27699-1617
RECENM
MAY 15 2024
NC DEQ/DWA
Central Office
NC Dept of E,31viro�,-,eta; Qaa!iy
Subject: NOTICE OF VIOLATION & INTENT TO ASSESS CIVIL PENALTY
Tracking Number: NOV-2024-LV-0317 MAY 2 0 2024
NPDES Permit # NCO026441
Town of Siler City
Chatham County
Raleigh Reg?cilai 0}Ijce
Dear Vanessa E. Manuel,
. This letter
is in response to the NOV & Intent for Civil
Penalty
issues on April 11, 2024, for exceeding
the following parameters for February 2024:
Sample
Limit
Reported
Type of
Location
Parameter
Date
Value
Value
Violation
001 Effluent
Nitrogen, Ammonia Total (as N)
2/3/24
6
6.62
Weekly Average Exceeded
001 Effluent
Nitrogen, Ammonia Total (as N)
2/10/24
6
7.56
Weekly Average Exceeded
001 Effluent
Nitrogen, Ammonia Total (as N)
2/10/24
6
6.66
Weekly Average Exceeded
001 Effluent
Nitrogen, Ammonia Total (as N)
2/10/24
6
6.56
Weekly Average Exceeded
001 Effluent
Nitrogen, Ammonia Total (as N)
2/10/24
2
6.15
Monthly Average Exceeded
001Effluent
BOD, 5-Day
2/10/24
15
15.9
Weekly Average Exceeded
00lEffluent
BOD, 5-Day
2/17/24
15
18.52
Weekly Average Exceeded
001Effluent
BOD, 5-Day
2/10/24
10
16.73
Monthly Average Exceeded
It is believed that these violations occurred due to nitrification inhibition in the plant starting at the end of
December and continuing into March. Once the inhibition started, we started sampling and tracking the plant's
previous data to find the reason. We had MLSS brought in from another WWTP, changed our wasting patterns and
volume amount, along with working with the Hazen and Sawyer Engineer firm to help resolve the issues. We are still
hauling the WTP solids to the plant and storing them in a basin while we decant the solids and send the solids to the
loading stand for land application. By keeping the WTP flow out of the collection system we were able to recover
the plant at the beginning of March and seem to be doing well to date. We also discovered that we may have been
phosphorus -limited in our Influent, possibly from the WTP in the collection system. We are working with Synagro
and Hazen and Sawyer regarding the WTP residuals and flow to the WWTP for solutions.

! Sincerely, - -
M
Brittany York,
WWTP Superintendent,
Siler City
Cc: Hank Raper - Town Manager, Chris McCorquodale - Utility Director
NC Dept ofEnvirol�r�e��ia] Qaif
MAY 2 a 2Q24
Raleigh 'egiO22al
t .
Brittany York Brittany York
WWTP Superintendent [e-mail]
PO Box 769.311 N Second Avenue Phone: [phone]
Slier City, NC 27344-0769 www.silercity.org
To advance a framework for our success through balanced governance, dynamic partnerships, and an engaged community.
To advance a framework for our success through balancedgovernance, dynamic partnerships, and an engaged community.