NC0055786_DMR Review Record_20230630

DMR REVIEW RECORD
Winston-Salem Regional Office
Facility Name: Lexington Regional WWTP Permit Number: NCO055786
Report Period: April 2023 Prior Assessments: 0 Enforcement Factor: 1.00
Waterbody
Outfall # Outfall Description
Waterbody Name
Classification
001 Effluent to Abbotts Creek
Abbotts Creek Arm of High Rock Lake
WS-V,B
Monthly Average Limit Violations
Sample Location: Outfall 001- Effluent
Violation
Unit of
Limit
Calculated
% Over
Date Parameter
Frequency
Measure
Value
Value
Limit
Action
4/30/2023 BOD, 5-Day (20 Deg. C) -
5 X week
mg/I
5
6.30
26.1
Proceed to NOI
Concentration
4/30/2023 Nitrogen, Ammonia Total (as N) -
5 X week
mg/I
1
1.80
80.3
Proceed to NOI
Concentration
Weekly Average Limit Violations
Sample Location: Outfall 001- Effluent
Violation
Unit of
Limit
Calculated
% Over
Date Parameter
Frequency
Measure
Value
Value
Limit
Action
4/1/2023 BOD, 5-Day (20 Deg. C) -
5 X week
mg/I
7.50
8.60
14.9
Proceed to NOI
Concentration
4/8/2023 BOD, 5-Day (20 Deg. C) -
5 X week
mg/I
7.50
8
6.7
Proceed to NOI
Concentration
4/29/2023 BOD, 5-Day (20 Deg. C) -
5 X week
mg/I
7.50
7.90
5.8
Proceed to NOI
Concentration
4/29/2023 Nitrogen, Ammonia Total (as N) -
5 X week
mg/I
3
4.00
31.7
Proceed to NOI
Concentration
Other Violations/Staff Remarks:
County: Davidson
MAF: 3.817241 MGD
Reported As: Non -Compliant
eDMR Comments: "In Stream Hardness was 57 Mg/L on 4/5/2023 at 08:39 am
4/25/2023 - Increase in BOD and Ammonia likely due to seasonal increase in final clarifier maintenance. Distributing maintenance
tasks more evenly to better keep water parameters in line with permit requirements."
JSB Remarks: Second consecutive month of limit violations due to maintenance activities.
JSB Recommendation: NOV

Supervisor Remarks:
Lon NOI I would like to get a response
Completed by: Jesse Barnes
Assistant Regional
Supervisor Sign -off:
Regional
Supervisor Sign -off: LTS
Permit Number: NCO055786
NOV-2023-LV-0471
Date: 6/30/2023
Date:
Date: 6/30/2023
Prior 12-Month Enforcement History
Report Period: April 2023
Limit Violation
Sample Location:
Outfall 001 - Effluent
Violation
Report
Violation
Date
Period
Parameter
Type
NOD NOV CPA
10/8/2022
10-2022
BOD, 5-Day (20 Deg. C) -
Weekly Average
NOV-2022-LV-0904
Concentration
Exceeded
3/18/2023
3-2023
BOD, 5-Day (20 Deg. C) -
Weekly Average
NOV-2023-LV-0348
Concentration
Exceeded
3/31/2023
3-2023
Nitrogen, Ammonia Total (as
Monthly Average
NOV-2023-LV-0348
N) - Concentration
Exceeded
4/30/2022
4-2022
BOD, 5-Day (20 Deg. C) -
Monthly Average
NOV-2022-LV-0472
Concentration
Exceeded
4/30/2022
4-2022
Nitrogen, Ammonia Total (as
Monthly Average
NOV-2022-LV-0472
N) - Concentration
Exceeded
5/28/2022
5-2022
BOD, 5-Day (20 Deg. C) -
Weekly Average
NOV-2022-LV-0471
Concentration
Exceeded
5/28/2022
5-2022
Nitrogen, Ammonia Total (as
Weekly Average
NOV-2022-LV-0471
N) - Concentration
Exceeded
5/31/2022
5-2022
BOD, 5-Day (20 Deg. C) -
Monthly Average
NOV-2022-LV-0471
Concentration
Exceeded
5/31/2022
5-2022
Nitrogen, Ammonia Total (as
Monthly Average
NOV-2022-LV-0471
N) - Concentration
Exceeded
6/30/2022
6-2022
BOD, 5-Day (20 Deg. C) -
Monthly Average
NOD-2022-LV-0112
Concentration
Exceeded
8/31/2022
8-2022
Nitrogen, Ammonia Total (as
Monthly Average
NOV-2022-LV-0795
N) - Concentration
Exceeded
9/30/2022
9-2022
Nitrogen, Ammonia Total (as
Monthly Average
NOV-2022-LV-0871
N) - Concentration
Exceeded