NC0020389_More Information (Received)_20201209

OF 8E44,
MAYOR
JERRY M MEDLIN A. j TOWN MANAGER
* v I* FREDERICK NELSON
MAYOR PRO-TEM
CASANDRA P STACK ♦o�TN T C �f ? ASSISTANT
KIMBERLY
TOWN
P CKETT MANAGER
COMMISSIONER
MAXINE HOLLEY TOWN OF BENSON TOWN CLERK
JAMES D. JOHNSON ANGELA THORNTON
DEAN MCLAMB P 0 BOX 69
WILLIAM NEIGHBORS 303 EAST CHURCH STREET TOWN ATTORNEY
DR R. MAX RAYNOR BENSON, NC 27504 R ISAAC PARKER
[phone]
FAX[phone]
www townofbenson.corn
December 4,2020
RECEIVED
NC DEQ/DWR
Attn: NPDES Unit DE 09 7020
1617 Mail Service Center NCDEQ/DWR/NPDES
Raleigh,NC 27699-1617
Subject: NPDES Permit Renewal
Permit Renewal - Supplemental Information
Benson WWTP
NPDES Permit#NC0020389
Johnston County
Dear Permitting Unit:
The Town of Benson WWTP has received a draft permit for review for NPDES#NC0020389. We have
recently been informed that a request for reduced monitoring could be made during the renewal process.
We are submitting this additional information to be considered during the renewal process. We are
requesting that monitoring for BOD5, TSS, NH3-N and Fecal Coliform be reduced under the
"exceptionally performing facilities"criteria to two times per week.
The attached data (summarized in the following table) indicates that the WWTP effluent has greatly
exceeded the minimum criteria for reduced monitoring. The most restrictive summer limits were used
for calculating removal rates for BOD5, TSS and Fecal Coliform. For NH3-N, a weighted average was
calculated using the winter and summer limits. The data used for this 3-year analysis was for the period
of October 2020—November 2017.
Analysis of testing results for the past three years:
- Percent of Monthly Average Limit
Parameter Monthly Limit 3-Year Average % of Limit
BOD5 5.0 mg/1 2.1 mg/1 42 %
TSS 30.0 mg/L 2.0 mg/L 7 %
Fecal Coliform 200/100 ml 1.4 colonies/100 ml 2%
NH3-N 1.42 mg/1 (Average) 0.5 mg/1 35.3%

- Number of Samples Over 200% of Monthly Average Limit
Parameter 200% of Monthly Limit ; Number of Samples Over
BOD5 10.0 mg/1 8
TSS 60 mg/L 11
NH3-N 2.0/4.0 10
- Number of Samples Over 200% of Weekly Average Limit
Parameter 200% of Weekly Limit Number of Samples Over
Fecal Coliform 800 0
In addition to the exceptional test results, the Benson WWTP is in compliance with all other criteria
listed in Section B Approval Criteria of the October 22, 2012 guidance document regarding reduction
of monitoring frequencies.
The Town appreciates the Division's effort to reduce the regulatory and monetary burden on systems
that strive consistently to provide exceptional wastewater treatment.We thank you for your consideration
in these matters. If you have any additional questions or comments, please contact Brian Leavitt at:
[phone] or [e-mail].
Sincerely,
Tim Robbins, Public Utilities Director
Town of Benson

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