NC0040011_202212VRR_20230227

DMR REVIEW RECORD
Winston-Salem Regional Office
Facility Name: Yanceyyille WWTP Permit Number: NCO040011
Report Period: December 2022 Prior Assessments: 0 Enforcement Factor: 1.00
Waterbody
Outfall # Outfall Description
Waterbody Name
Classification
001 Effluent to Country Line Creek
Country Line Creek
C
Monthly Average Limit Violations
Sample Location: Outfall 001- Effluent
Violation
Unit of
Limit
Calculated
% Over
Date Parameter
Frequency
Measure
Value
Value
Limit
Action
12/31/2022 Solids, Total Suspended -
Weekly
mg/I
30
30.50
1.7
Concentration
Weekly Average Limit Violations
Sample Location: Outfall 001 - Effluent
Violation
Unit of
Limit
Calculated
% Over
Date Parameter
Frequency
Measure
Value
Value
Limit
Action
12/31/2022 Solids, Total Suspended -
Weekly
mg/I
45
80
77.8
Concentration
Other Violations/Staff Remarks: Caswell County; MAF = 0.214226 MGD
DMR Comments: "For Validated Warnings on Upstream/Downstream Sample Frequencies, all parameters were sampled for
Week #1 on Wednesday November 30, 2022 during that calendar week. For Validated Warnings on Influent & Effluent Sample
Frequencies, all parameters were sampled for Week #1 on Tuesday November 29, 2022 during that calendar week.
Temperatures were sub -freezing for several days prior to a solids excursion that caused the high TSS concentrations. Frozen
valves caused the SBR system to enter a Storm Mode-3 which is a flow -through phase. I was able to return the system to Normal
by late Monday night. Basins were at normal solids levels by Tuesday 12127122 morning and checked again on Wednesday
morning 12128122. Weekly composite sampling began that same Wednesday morning. Sometime between Wednesday afternoon
and Thursday morning, solids from Aerobic Digester #1 back -flowed into the basins. There was still a lot of freezing activity even
though temperatures were beginning to slowly increase each day. Rags may have also become frozen in the discharge lines at
the back -flow preventers keeping them from closing completely. This digester was out of service and all valves (Wasting &
Decant) were closed and confirmed that they were closed both on Thursday 12/28/22 and Friday 12130122. It is still unknown how
this happened. Solids were pumped from the digesters over the next several days and solids that leached into the Equalization
Basin due to high blanket levels were pumped out as well as the Chlorine Contact Basins."
Permittee checked "non -compliant." Review confirmed violation.
Recommend: NOD
Supervisor Remarks:
Jenny — NOV
NOV-2023-LV-0140

Completed by: Seren Homer
Assistant Regional
Supervisor Sign -off: JG
Regional
Supervisor Sign -off:
Permit Number: NC0040011
Date: 2/27/2023
Date: 3/1/2023
Date:
Prior 12-Month Enforcement History
Report Period: December 2022
Limit Violation
Sample Location:
Outfall 001 - Effluent
Violation
Report
Violation
Date
Period
Parameter
Type
NOD NOV CPA
2/26/2022
2-2022
Coliform, Fecal MF, MFC
Weekly Geometric
NOV-2022-LV-0464
Broth, 44.5 C
Mean Exceeded
5/14/2022
5-2022
Nitrogen, Ammonia Total (as
Weekly Average
NOV-2022-LV-0638
N) - Concentration
Exceeded
8/20/2022
8-2022
BOD, 5-Day (20 Deg. C) -
Weekly Average
NOV-2022-LV-0748
Concentration
Exceeded
8/31/2022
8-2022
Nitrogen, Ammonia Total (as
Monthly Average
NOV-2022-LV-0748
N) - Concentration
Exceeded
9/3/2022
9-2022
Nitrogen, Ammonia Total (as
Weekly Average
NOD-2022-LV-0137
N) - Concentration
Exceeded