NC0069841_NOV-2020-PC-0400 CAP and Summary_20200902

Strickland, Bev
From:
Bart Farmer <[e-mail]>
Sent:
Wednesday, September 2, 2020 1:58 PM
To:
Scheller, Roberto
Cc:
Alex Laytham
Subject:
[External] Corrective Action Plan and Summary
Attachments:
Crooked Creek Ammonia Results.xlsx
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Roberto,
Thank you for the call today. I have put together the following information and hope that this email will satisfy the
requirement for a Corrective Action Plan as described in the most recent NPDES permit issued for our Crooked Creek
WRF.
The Crooked Creek WRF has historically produced excellent results in the area of compliance with the Ammonia -
Nitrogen limits. We achieve this by keeping a MLSS concentration in the neighborhood of 3200 mg/I, as well as
maintaining a dissolved oxygen concentration between 1.0-3.0. This methodology is proven out by the results of our
sampling. The attached spreadsheet shows the sample results for the past 24 months. The results are summarized here:
• 307 Samples
• 253 Results of <0.1 mg/I (95% non -detect rate)
• High result of 0.96mg/I
An interesting note: We experienced a catastrophic failure of the shaft on aerator #204, and had to get the part custom
machined. That aerator was down from 7/1/20 until 7/29/20. The entire period had results of <0.1mg/I.
Future actions:
• We are in the pre -bid phase of upgrades to the aeration process. We will be retiring the paddle brush aerators
and installing disc aerators. The disc aerators will provide greater mixing, improved aeration, better nitrification,
and increased energy efficiency.
• The Union County Master Plan projects the building of a larger regional WRF lower on the Crooked Creek basin
in the next few years. This facility will replace both the current Crooked Creek WRF and the Grassy Branch WRF.
Please let me know if you need anything further.
Thank you,
Bart T. Farmer
Water Reclamation Facilities Superintendent
. *_ L ('1iA , " ry� K I J �-.
Union County
Public Works
4600 Goldmine Rd
Monroe, NC 28112
T 704-296-4227
F 704-289-7395
C 828-260-3583
bart.farmer(o-)-unioncountync.gov
1

www.unioncountync.gov
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