NC0070289_DMRFRM_20200820

DMR REVIEW RECORD
Mooresville Regional Office
Facility Name: Ridgewood Farms at Stones Throw WWTP
Permit Number: NCO070289
Report Period: June 2020
Prior Assessments:
0 Enforcement Factor: 1.00
Waterbody
Outfall # Outfall Description
Waterbody Name
Classification
001 Effluent to Caldwell Creek
Caldwell 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
6/30/2020 BOD, 5-Day (20 Deg. C) -
Weekly
mg/I 18
18.20 1.1
Concentration
6/30/2020 Nitrogen, Ammonia Total (as N) -
Weekly
mg/I 5
23.60 372.4
Concentration
Daily Limit Violations
Sample Location: Outfall 001 - Effluent
Violation
Unit of Limit
Calculated % Over
Date Parameter
Frequency
Measure Value
Value Limit Action
6/29/2020 BOD, 5-Day (20 Deg. C) -
Weekly
mg/I 27
30 11.1
Concentration
6/29/2020 Coliform, Fecal MF, MFC Broth,
Weekly
#/100ml 400
600 50.0
44.5 C
6/11/2020 Nitrogen, Ammonia Total (as N) -
Weekly
mg/I 25
28 12.0
Concentration
6/25/2020 Nitrogen, Ammonia Total (as N) -
Weekly
mg/I 25
33 32.0
Concentration
6/29/2020 Nitrogen, Ammonia Total (as N) -
Weekly
mg/I 25
28 12.0
Concentration
Other Violations/Staff Remarks: Based on
past 12-month history, poor facility conditions, and Ammonia toxicity to
receiving stream, I recommend this be issued as a NOI.
During last CEI conducted at this facility it was noted older
MLSS and sludge blanket within 18 to 24 inches
of surface of secondary clarifier.
Supervisor Remarks:
NOI

DocuSigned by:
Completed by:
91C2A007838943E...
Assistant Regional
Supervisor Sign -off:
DocuSigned by:
Regional --
Supervisor Sign -off: A14CC681AF27425 ..
Date: 8/20/2020
Date:
Date:
8/20/2020

Prior 12-Month Enforcement Histor
Permit Number: NCO070289
Report Period: June 2020
Limit Violation
Sample Location:
Outfall 001 - Effluent
Violation Report
Violation
Date Period
Parameter
Type
NOD NOV CPA
5/6/2020 5-2020
BOD, 5-Day (20 Deg. C) -
Daily Maximum
NOV-2020-LV-0548
Concentration
Exceeded
5/21/2020 5-2020
Coliform, Fecal MF, MFC
Daily Maximum
NOV-2020-LV-0548
Broth, 44.5 C
Exceeded
5/31/2020 5-2020
Flow, in conduit or thru
Monthly Average
NOV-2020-LV-0548
treatment plant
Exceeded
7/2/2019 7-2019
Coliform, Fecal MF, MFC
Daily Maximum
NOV-2019-LV-0677
Broth, 44.5 C
Exceeded
Monitoring Violation
Sample Location:
Outfall 001 - Effluent
Violation Report
Violation
Date Period
Parameter
Type
NOD NOV CPA
9/30/2019 9-2019
Nitrogen, Total - Concentration
Frequency Violation
NOV-2019-MV-0171
9/30/2019 9-2019
Phosphorus, Total (as P) -
Frequency Violation
NOV-2019-MV-0171
Concentration