NC0025534_NOD-2018-PC-0033_20180228

State of North Carolina | Environmental Quality | Water Resources
2090 U.S. 70 Highway, Swannanoa, NC 28778
828-296-4500

February 28, 2018

Lee Smith, Director Utilities
City of Hendersonville
305 Williams St
Hendersonville, NC 28792

SUBJECT: NOTICE OF DEFICIENCY
Tracking Number: NOD-2018-PC-0033
Permit No. NC0025534
Hendersonville WWTP
Henderson County

Dear Permittee:

The North Carolina Division of Water Resources conducted an inspection of the Hendersonville WWTP on
February 8, 2018. This inspection was conducted to verify that the facility is operating in compliance with the
conditions and limitations specified in NPDES WW Permit No. NC0025534. A summary of the findings and
comments noted during the inspection are provided in the enclosed copy of the inspection report.

The Reconnaissance inspection was conducted by Division of Water Resources staff from the Asheville Regional
Office. The following deficiency was noted during the inspection:
Inspection Area Deficiency Description ______________________________________________________________________________________________
Flow Measurement – Influent: The influent flow meter is not operational during times of high flow events. ______________________________________________________________________________________________

Compliance issue summary:
During high flow events, wastewater backs-up into the collection system directly upstream of the facility. High flow
events are often associated with large or intense precipitation events resulting in infiltration and inflow into the
collection system. When the wastewater flow backs up into the collection sys tem, the influent flow meter can
become submerged and inoperable during these periods. The subject permit requires continuous flow monitoring.
Use of the existing collection system as temporary storage or flow equalization is resulting in sewer overflows a nd
non-compliance with your NPDES permit as described.

Please aggressively address infiltration and inflow issues in the collection system. In the interim, you are to ensure
that any use of the collection system in this manner does not result in sewer overflows. Additionally, the Division is
requiring you to install a totalizer on the existing effluent flow meter and report these values. The Division is
particularly interested in the effluent flow during high flow events, however, reporting of the flow from this meter
DocuSign Envelope ID: D4A29136-36C2-4AEB-8AE7-062D7CC95E9A

State of North Carolina | Environmental Quality | Water Resources
2090 U.S. 70 Highway, Swannanoa, NC 28778
828-296-4500

should be supplemental to the existing flow metering. If the current conditions (i.e., SSOs and flow meter failure)
observed during high flow events continue, the Division will consider requiring installation of permanent measures
(e.g., Parshall flume) to ensure flow measurement is continuous at the facility.

Remedial actions should have already been taken to correct this problem and prev ent further occurrences in the
future. The Division of Water Resources may pursue enforcement action for this and any additional violations of
State law. To prevent further action, carefully review these deficiencies and address the causes of
non-compliance to prevent the recurrence of similar situations.

If you should have any questions, please do not hesitate to contact Daniel Boss with the Water Quality
Regional Operations Section in the Asheville Regional Office at 828 -296-4500.

Sincerely,

G. Landon Davidson, P.G., Regional Supervisor
Water Quality Regional Operations Section
Asheville Regional Office
Division of Water Resources, NCDEQ

ATTACHMENTS: Inspection Report

Cc: WQS ARO Server
NPDES Laserfiche
DocuSign Envelope ID: D4A29136-36C2-4AEB-8AE7-062D7CC95E9A