WQ0032821 CEI

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Dimaor
Wendell Davis
County Manager
Durham County
200 East Main St.
Durham, NC 27701
Mr. Davis
NORTH CAROLINA
Environmental Quality
September 11, 2019
Subject: Compliance Evaluation Inspection
Reclaimed Water Generation, Bulk Distribution System,
And Reclaimed Water Distribution Lines
Permit Number WQ0032821
Durham County
On September 11, 2019 Rick Trone of the Raleigh Regional Office conducted a compliance evaluation
inspection of the reclaimed water generation and distribution system located at Triangle WWTP.
Reclaimed water is generated at the facility under permit NCO026051. The facility is permitted to operate
a bulk reclaimed water fill station. Reclaimed water is also distributed to the Town of Cary and NIH. The
purpose of this inspection was to ensure compliance with the subject permit. During the inspection, the
cooperation and assistance provided by Mr. Shawn Davis, ORC, Ms. Stephanie Brixey, Utility Division
Manager, and Amy Moore, Compliance Manager was helpful and appreciated.
This compliance evaluation inspection consisted of the following:
• Review of the permit;
• Review of the owner/facility information;
• Review of ORC logbooks, calibration documentation, lab bench sheets, Non -discharge
wastewater monitoring reports (NDMM), and;
• On -site inspection of treatment and storage components
The current permit was issued August 23, 2018 and expires on December 31, 2021.
Currently the facility has no users of bulk reclaimed water. Reclaimed water is distributed to Town of
Cary and NIH. The facility also utilizes reclaimed water for various uses around the facility.
The facility monitors pH, flow, residual chlorine, BOD, NH3-N, TSS, Fecal Coliform, and Turbidity.
Monitoring requirements are aligned with the facilities NPDES permit. Fecal coliform and total residual
D_E Q2� North Carolina Department of Environmental Quality I Division of Water Resources
Raleigh Regional Office 1 3600 Barrett Drive I Raleigh. North Carolina 27609
Gma"mioit 919.791.4200

chlorine are sampled at the reclaimed pump station. The monitoring and reporting requirements are being
met. Random months of NDMR forms were compared against lab bench sheets with no errors noted.
The performance standards specified in the permit were being met, including effective maintenance and
operation of the system. In addition, all requirements were being met for labeling, color -coding, and
spacing of the various elements of the reclaimed water system. Appropriate signage is also installed in
areas where reclaimed water is used. The facility maintains a map of the system. Employee training
documents on the use of reclaimed water were reviewed and are compliant with permit requirements. An
Operation and Maintenance Plan for the reclaimed system is on site and is compliant with permit
requirements.
All monitoring equipment appeared to be well maintained and functioning properly. The chlorination and
transfer equipment appear well maintained. The storage tanks, pumps, and other reclaimed components
all appeared to be well maintained. The reclaimed water system flowmeters and turbidimeters were last
calibrated on various dates in 2018 and 2019 by CITI LLC. The facility diverts water from the reclaimed
system if turbidity reaches 3 NTU.
Overall, the reclaimed water generation and distribution appeared to be extremely well maintained.
If you have any questions about this inspection or this letter, please contact Rick Trone at
rick.trone(ancdenr.eov or 919-791-4200.
Sincerely,
Rick Bolich, L.G.
Assistant Regional Supervisor
Water Quality Regional Operations
Raleigh Regional Office
Attachments: EPA Water Compliance Inspection Report
cc:
Central Files
RRO Files