NC0020567_Request to Modify for Reduced Monitoring_20240124

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EXECUTIVE DIRECTOR
Nicole Johnston
SECRETARY
Rheajean Benge
TREASURER
Wayne V. Moore
January 16, 2024
At
�A
CHAIR
Woody Faulk
VICE -CHAIR
Anita Darnell
BOARD OF DIRECTORS
Rheajean Benge
Wayne V. Moore
Robert Ball
RECEIVED
Mr. Gary Perlmutter
Division of Water Resources JAN ti; 4 %'G'L4
Water Quality Permitting Section — NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617 NCDEQ/0WR/NPDES
Re: Request to modify the Yadkin Valley Sewer Authority WWTP NPDES permit, NC0020657,
for reduced monitoring of BOD, TSS, and Fecal Coliform
Dear Mr. Perlmutter,
The Yadkin Valley Sewer Authority would like to request maintaining the reduced monitoring of
1) BOD, 2) TSS, and 3) Fecal Coliform - at current twice per week frequency for the YVSA
WWTP NDPES permit renewal.
Per Section B of DWQ Guidelines Regarding the Reduction of Monitoring Frequencies in
NPDES Permits for Exceptionally Performing Facilities that you provided, the YVSA WWTP
facility meets all the approval criteria presented. Please see the attachment and enclosed SD card
which presents information and data to justify the request.
If you have any questions or need further information, please let me know.
Sincerely,
Nicole Johnston
Executive Director
Yadkin Valley Sewer Authority
Attachment: Criteria information and data summary
Enclosure: SD card w/ Excel file - WWTP DMR Data 3 Yrs from 11-2023.xlsx
500 NC Hwy 268 W — Elkin, NC 28621
Phone: [phone] — www.yysa.org — Fax: [phone]

Attachment: Criteria information and data summary
Section B. Criteria Approval
• YVSA WWTP has no civil penalty assessments for permit limit violations for BOD, TSS and Fecal
Coliform during previous three years.
• YVSA nor any of its employees have been convicted of criminal violation of the Clean Water Act
within the previous five years.
• YVSA WWTP is not currently under an SOC for target parameter effluent limit noncompliance.
• YVSA WWTP is not on EPNs Quarterly Noncompliance Report for target parameter limit
violations.
• YVSA WWTP BOD and TSS 3-year arithmetic means are less than fifty percent of the monthly
average permit limit (see below). Fecal coliform 3-year geometric mean is less that 50 percent of
the monthly average permit limit (see below).
• YVSA WWTP had zero (0) daily sampling results for BOD and TSS over the 3-year review period
exceeded 200% of the monthly average limit (see below).
• YVSA WWTP had one (1) daily sampling result for fecal coliform over the 3-year period exceeded
200% of the weekly average limit (see below).
• YVSA WWTP had none of the four target parameters sampling results showed any non -monthly
average limit violations during the previous year
• YVSA WWTP reduced effluent monitoring will not impair assessment of sensitive downstream
uses.
3-Years WWTP DMR Data - Dec 2021 thru Nov 2023
Sampling Location - Effluent Discharge No.: 001
Sample
Mthly Avg
% of Mthly
Results
Total
Arithmetic
Permit
Avg Permit
>200%of
Type
Sum
Occ
Mean
Level
Limit
Mtly Limit
BOD
387.88
314
1.235287
30.0
4.1%
0
TSS
824.40
190
4.338947
30.0
14.5%
0
SampleResults
Mthly Avg
% of Mthly
Wkly Avg
Geometric
Permit
Avg Permit
Permit
> 200% of
Type
Mean
Level
Limit
Level
Wkly Limit
FCOLI
8.489841
200.0
4.2%
400.0
1
RECEIVED
J� i �4 _, T
NCDEO/D`NFgNPDES