WQ0007349_Annual Report_20230724

North Carolina Department of Environmental Quality | Division of Water Resources
Winston-Salem Regional Office | 450 W. Hanes Mill Rd, Suite 300 | Winston-Salem, North Carolina 27105
336.776.9800

July 24, 2023

Delivered via email to: [e-mail]

Nicole Johnston, Executive Director
Yadkin Valley Sewer Authority
P.O. Box 828
Elkin, NC 28621

SUBJECT: 2022 Residuals Annual Report Review
Yadkin Valley Sewer Authority, Residuals Land Application Program
Permit No. WQ0007349
Surry County

Dear Ms. Johnston:

Division of Water Resources staff Kristen Potwora conducted a review of the 2022
Residuals Annual Report. This review mostly reflected compliance with the subject permit.
The following items of concern were noted:

1. As a reminder, land application notifications must be completed at least one
business day in advance of land application per Permit Condition III.3. Based
on available records, there was no notification prior to the March 22, 2022, land
application event. All land application notifications can be directed to Caitlin
Caudle at [e-mail] or 336-776-9699.
2. All Field Summary Forms reported the incorrect Plant Available Nitrogen (PAN)
rate. The reported rate was 194 lbs/ac. According to the North Carolina State
University Realistic Yield Database the PAN rate for Fairview (FcB2) soils in Wilkes
County is 188 lbs/ac. This was also noted in correspondence dated May 4, 2022.
There was no concern for over application. Moving forward, please ensure that
the correct PAN rate is reported.
3. The Sodium Absorption Rate (SAR) calculation incorrectly reported the
magnesium concentration as 64.015mg/L and SAR as 0.971494. Staff calculated
the magnesium concentration as 93.515 mg/L and SAR as 0.900497. Moving
forward, please ensure all calculations are correct.

North Carolina Department of Environmental Quality | Division of Water Resources
Winston-Salem Regional Office | 450 W. Hanes Mill Rd, Suite 300 | Raleigh, North Carolina 27105
336.776.9800

Please refer to the enclosed inspection report for additional comments and observations.
If you have any questions, please contact Kristen Potwora by phone at [phone]
or by email at [e-mail].

Sincerely,

Jennifer F. Graznak, Assistant Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources, NCDEQ-WSRO

Enc: Inspection Report

Cc: Zach Key, US Biosolids (electronic copy)
Hal Transou, United Water (electronic copy)
Surry County Environmental Health (electronic copy)