NC0026441_NOV-2020-LV-0533 Response_20200722

?caw 4Sam Gaf
Public works and Utilities
July 22,2020
ATTN.' Vanessa E. Manuel, Assistant Regional Supervisor
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NOTICE OF VOLATION
Tracking Number: NOV-2020-LV-0533
Permit No. NCO026441
Town of Siler City WWTP
Chatham County
!W-1-
W Dept of Envrranmentai Quality
RSleigh Re,, 0ifii.6:
Dear Vanessa E. Manuel,
This letter is in response to the Notice of Violation issued on July 14,2020 for the following violations
• Exceeding weekly average of BOD,5-Day on 5/23/2020. Limit value = 7.5 mg/1 Reported value =10 mg/I
• Exceeding weekly geometric mean for Coliform, Fecal MF on 5/23/2020 Limit value = 400 Reported value
5,280.02
• Exceeding weekly average Nitrogen, Ammonia Total (as N) on 5/30/2020 Limit value = 3mg/I Reported
value = 3.82
• Exceeding monthly average BOD, 5-Day on 5/31/2020 Limit value = 5 mg/I Reported value = 5.53 mg/I
• Exceeding monthly average of Nitrogen, Ammonia Total (as N) 5/31/2020 Limit value = 1 mg/I Reported
value =1.47 mg/I
It is believed that these violations are a continuous situation that we have experienced for the past few
months. A combination of things could be the reason these violations accrued, including high flow events,
holding onto sludge longer due to not being able to land apply due to the wet season, and a potential high
load of carbon interfering with our treatment process. We have had Synagro here the end of June beginning
of July. While here they were able to haul and land apply 900,000 gals. We have wasted as much as our
storage allows us to in hopes of improving our treatment process. The plant seems to be responding well
since we have been able to waste more, we are beginning to see more normal results within the past few
weeks. If you have any questions, please do not hesitate to contact me.
Sincerely, L
Town of Siler City WTP
Brittany York — WWTP Superintendent
Cc: Roy Lynch Town Manager, Chris McCorquodale Public Works & Utility Director
Brittany York
WWTP Superintendent [e-mail]
PO Box 769 + 311 N Second Avenue Phone: [phone]
Siler City, NC 27344-0769 wwwzilercity.org