WQCS00124_Annual Report_20240211

11 February 2024
NC Division of Water Quality
NPDES Permit Issuing Authority
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: System Performance Annual Report
NPDES Permit Number: NC0062855
Collections System Permit Number: WQCS0004682
Town of Robbins, Moore County, NC
Dear Permitting Authority:
Enclosed is the 2023 Annual Performance Report for the Town of Robbins Wastewater Treatment Plant
and Collections System for the time period of January 1, 2023 to December 31, 2023. We believe the
report to be complete and accurate. The violations that occurred are detailed on the following pages.
The Town of Robbins did not land apply sludge residuals in 2023 and the permit was not renewed. The
following report covers spills and plant compliance or non-compliance for the year.
Sludge residuals were held in our Aerobic Digester this year.
Sincerely,
Michael K Criscoe
Town of Robbins Wastewater Treatment Plant ORC
PO Box 296/101 N. Middleton St, Robbins, NC 27325
[e-mail]
910-571-2902 (cell)
910-948-3063 (office)

General Information
Facility/System Name: Town of Robbins Wastewater Treatment Plant
NPDES Permit Number: NC0062855
Collections System Permit Number: WQCS0014
Responsibility Entity: Town of Robbins
Contact Information:
Permittee: Clint Mack
P.O. Box 296
Robbins, NC 27325
[e-mail] 910-948-2431
WWTP ORC: Michael K Criscoe
P.O. Box 296
Robbins, NC 27325
[e-mail] 910-571-2902
Collections ORC: Michael K Criscoe
P.O. Box 296
Robbins, NC 27325
[e-mail] 910-571-2902
Description of Treatment Process:
All wastewater is conveyed to the Robbins WWTP via a permitted collection system. The collection
system consists of approximately 13.97 miles of gravity sewer, 1.58 miles of force main, and three (3)
duplex pump stations.
The Town of Robbins WWTP is an extended aeration facility. This facility has a design flow capacity of
1.3 MGD. Treatment is initiated at a preliminary treatment unit (headworks), which consists of a grit
removal unit, and an automatic screening unit to remove debris. Screened wastewater is pumped to a
secondary treatment unit. Dual activated sludge treatment units are equipped with center -feed
clarifiers. Mixing and aeration are provided by diffused aeration. Caustic soda is added at the head of
the system to add alkalinity, which promotes nitrification. Aluminum Sulfate is added prior to the
clarifiers to facilitate setting solids and to help remove phosphorus. Clarified effluent is disinfected by
gas chlorination, and then de -chlorinated with sulfur dioxide. Settled sludge is either returned to the
system as Returned Activated Sludge or wasted into an aerobic digester for further stabilization.
Digested sludge is then dewatered and transported offsite by a contract composting facility. The
treated effluent wastewater is discharged into Deep River, in the Cape Fear River Basin.
Compliance Performance:
The Town of Robbins WWTP and Collection System are regulated by the NC Department of
Environmental Quality (NCDEQ). The town holds a National Pollutant Elimination System (NPDES)
Permit that includes water quality limits and sample monitoring requirements. The NPDES Permit
requires the Town of Robbins WWTP to test 15 effluent characteristics in the treated water. The

monitoring frequency for these effluent characteristics are set at various intervals to provide consistent
results.
The Town of Robbins W WTP consistently achieves 85% efficiency of removal of BOD and TSS. The
following is a summary of testing for effluent characteristics that are assigned Water Quality Standards
by the NPDES Permit: The permit was renewed and the required number of tests were increased.
Effluent Characteristics
# of Required Tests
# of Conducted Tests
Flow
Continuous
Continuous
Biochemical Oxygen Demand
2/Week
104
Total Suspended Solids
2/Week
104
Ammonia (NH3)
2/Week
104
Dissolved Oxygen
3/Week
>156
PH
3/Week
>156
Temperature
Daily
Daily
(excluding weekends and holidays)
Fecal Coliform
2/Week
104
Total Chlorine Residual
Daily
Daily
Conductivity
3/Week
156
Total Nitrogen
Quarterly
4
Total Phosphorus
Weekly
104
Total Copper
Quarterly
4
Total Mercury
1 (once 5 years)
0
Chronic Toxicity
Quarterly
4
Instream Monitoring Requirements
Total Hardness
Quarterly
4
Dissolved Oxygen
3/Week June -September
54
(Upstream & Downstream)
1/Week October -May
12
Temperature
3/Week June -September
54
(Upstream & Downstream)
1/Week October -May
12
Please note: The summary only incorporates monitoring requirements, and does not include daily
process control testing. In addition to the required testing, the WWTP conducted in-house control tests
to ensure the proper operation of the wastewater treatment plant. Some of the plant control tests are
pH, temperature, ammonia (NH3), alkalinity, nitrates, dissolved oxygen, settle ability, suspended solids,
and oxygen uptake rate.

Performance:
Total Residual Chlorine
The Town of Robbins WWTP has a daily maximum discharge limit of 28 ug/LTotal Residual Chlorine and
was still considered compliant <50 ug/L. There were 17 instances in 2018 where the Total Residual
Chlorine (TRC) were found to be excess of the Daily Maximum Limit, but all instances were still <50 ug/L
and still considered compliant.
January 2023-Non-Compliant; pH below Limit of 6.0
February 2023-Non-Compliant; pH below limit of 6.0 and Temperature was missed
March 2023 - Compliant
April 2023-- Compliant
May 2023- Compliant
June 2023- Compliant
July 2023- Compliant
August 2023- Non -Compliant; fecal coliform exceeded daily max
September 2023 — Compliant
October 2023- Compliant
November 2023- Compliant
December 2023 — Non -Compliant; fecal coliform exceeded daily max

Collection System Spills:
January 2023 - No Spills
February 2023- No Spills
March 2023- No Spills
April 2023- No Spills
May 2023- No Spills
June 6, 2023 - 189 NC Hwy. 705-5000 Gallons
July 2023 - No Spills
August 2023 - No Spills
September 2023 - 720 East Hemp Street 500 Gallons
October 2023 — No Spills
November 22, 2023 —130 North Street 5000 Gallons
November 27, 2023 - South Emma Lane 500 Gallons
December 2023 - No Spills
Notification:
The availability of this report will be placed at Town hall, 101 N. Middleton Street, Robbins, NC, and
will be available for review via the Town's website at www.townofrobbins.com. Anyone that wishes
to obtain a copy can do so by visiting Robbins Town Hall or can receive a copy by mail upon request.

Certification:
I certify under penalty of law this report is complete and accurate to the best of knowledge. I further
certify this report will be made available to all users and/or customers of Town of Robbins Water
Treatment Plant upon request and advertised as noted above.
Michael K Criscoe
Wastewater treatment Plant ORC
Michael K Criscoe
Collections ORC
Clint Mack
Town Manager
Date: 0 t&/o7- Y
Date: OZ/13 CRY
Date: