NC0069841_Corrective Action Plan_20200911

Union County Public Works
Water/Wastewater Division
4600 Goldmine Road
Monroe, NC 28110
Union LountY T. 704-289-1434
,ove r n m e nt F. 704-289-7395
EST. 1842 www.unioncountync.gov
RECEIVED
SEP i 1 2020
NCDEQ/DWR/NPDES
To: NCDEQ
From: Union County Public Works,
Water/Wastewater Division
Subject: Crooked Creek WRF NC0069841
Corrective Action Plan
Date: 09/03/20
This Corrective Action Plan is being submitted per requirement as stated in NPDES permit#NC0069841,
page 11, A.(5.), satisfying paragraphs 1 & 2.
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 which show that we are already meeting, or exceeding, the more stringent
final limits required in 2022 (page 5, Table A.(2.) of the listed permit).
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.
Union County Government: Meeting Minutes Page 1

Union County Public Works
Water/Wastewater Division
4600 Goldmine Road
Monroe, NC 28110
Union County T. 704-289-1434
Government F. 704 289-7395
EST, 1842 www.unioncountync.gov
NOV/NOD:
• During this 24 month time period, we only had one violation. This violation (NOV-2018-MV-0171)
was a monitoring frequency violation. During the week this occurred, the WRF experienced a
hurricane and staff were unable to sample the required three times that week.
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.
• The next update to this plan will be submitted prior to January 31, 2021 to satisfy requirement in
paragraph 3 on page 11 of the listed permit.
Sincerely,
Bart T. Far er
WRF Superintendent
Union County Public Works, Water/Wastewater Division
Union County Government: Meeting Minutes Page 2

Crooked Creek Ammonia results
8/1/2018 <0.1
8/6/2018 <0.1
8/7/2018 <0.1
8/8/2018 <0.1
8/9/2018 <0.1
8/13/2018 <0.1
8/14/20218 <0.1
8/15/2018 <0.1
8/20/2018 <0.1
8/21/2018 0.16
8/22/2018 0.21
8/27/2018 <0.1
8/28/2018 <0.1
8/30/2018 <0.1
9/4/2018 <0.1
9/5/2018 <0.1
9/6/2018 <0.1
9/11/2018 0.57
9/12/2018 <0.1
9/13/2018 <0.1
9/19/2018 <0.1
9/20/2018 <0.1
9/21/2018 <0.1
9/24/2018 <0.1
9/25/2018 <0.1
9/27/2018 <0.1
10/2/2018 <0.1
10/3/2018 <0.1
10/8/2018 <0.1
10/9/2018 0.34
10/10/2018 <0.1
10/15/2018 <0.1
10/16/2018 <0.1
10/17/2018 <0.1
10/22/2018 <0.1
10/23/2018 <0.1
10/24/2018 <0.1
10/29/2018 <0.1
10/30/2018 <0.1
10/31/2018 <0.1
11/5/2018 <0.1
11/6/2018 <0.1
11/7/2018 <0.1
11/8/2018 <0.1
Page 1 of 7

11/9/2018 <0.1
11/13/2018 <0.1
11/14/2018 <0.1
11/15/2018 <0.1
11/19/2018 <0.1
11/20/2018 <0.1
11/21/2018 <0.1
11/26/2018 <0.1
11/27/2018 <0.1
11/28/2018 0.17
12/3/2018 <0.1
12/4/2018 <0.1
12/5/2018 <0.1
12/12/2018 <0.1
12/13/2018 <0.1
12/14/2018 <0.1
12/17/2018 <0.1
12/18/2018 <0.1
12/19/2018 <0.1
12/26/2018 <0.1
12/27/2018 <0.1
12/29/2018 <0.1
12/31/2018 <0.1
1/2/2019 <0.1
1/3/2019 0.11
1/7/2019 <0.1
1/8/2019 0.24
1/9/2019 0.2
1/15/2019 <0.1
1/16/2019 <0.1
1/17/2019 <0.1
1/22/2019 <0.1
1/23/2019 <0.1
1/24/2019 <0.1
1/28/2019 <0.1
1/29/2019 <0.1
1/30/2019 <0.1
1/31/2019 <0.1
2/4/2019 <0.1
2/5/2019 <0.1
2/6/2019 <0.1
2/7/2019 <0.1
2/11/2019 <0.1
2/12/2019 <0.1
2/13/2019 0.12
2/18/2019 <0.1
2/19/2019 <0.1
Page 2 of 7

2/20/2019 <0.1
2/25/2019 <0.1
2/26/2019 <0.1
2/27/2019 <0.1
3/4/2019 <0.1
3/5/2019 <0.1
3/6/2019 <0.1
3/11/2019 <0.1
3/12/2019 <0.1
3/13/2019 <0.1
3/18/2019 <0.1
3/19/2019 <0.1
3/20/2019 <0.1
3/25/2019 <0.1
3/26/2019 <0.1
3/27/2019 <0.1
4/1/2019 <0.1
4/2/2019 <0.1
4/4/2019 <0.1
4/8/2019 <0.1
4/9/2019 <0.1
4/11/2019 <0.1
4/16/2019 <0.1
4/17/2019 <0.1
4/18/2019 <0.1
4/22/2019 <0.1
4/23/2019 <0.1
4/24/2019 <0.1
4/29/2019 <0.1
4/30/2019 <0.1
5/3/2019 <0.1
5/6/2019 <0.1
5/7/2019 <0.1
5/8/2019 <0.1
5/14/2019 <0.1
5/16/2019 <0.1
5/17/2019 <0.1
5/20/2019 <0.1
5/21/2019 <0.1
5/22/2019 <0.1
5/28/2019 <0.1
5/29/2019 <0.1
5/30/2019 <0.1
6/3/2019 <0.1
6/4/2019 <0.1
6/5/2019 <0.1
6/10/2019 0.11
Page 3 of 7

6/11/2019 <0.1
6/12/2019 <0.1
6/17/2019 <0.1
6/18/2019 <0.1
6/19/2019 <0.1
6/24/2019 <0.1
6/25/2019 <0.1
6/26/2019 <0.1
7/1/2019 <0.1
7/2/2019 <0.1
7/3/2019 <0.1
7/8/2019 <0.1
7/9/2019 <0.1
7/10/2019 0.43
7/16/2019 <0.1
7/17/2019 0.45
7/18/2019 0.96
7 22 2019 <0.1
7/23/2019 0.38
7/24/2019 0.45
7/29/2019 <0.1
7/30/2019 <0.1
7/31/2019 <0.1
8/6/2019 <0.1
8/7/2019 <0.1
8/12/2019 <0.1
8/13/2019 <0.1
8/14/2019 <0.1
8/19/2019 <0.1
8/20/2019 <0.1
8/21/2019 <0.1
8/26/2019 <0.1
8/27/2019 <0.1
8/28/2019 <0.1
9/3/2019 <0.1
9/5/2019 <0.1
9/9/2019 <0.1
9/10/2019 <0.1
9/11/2019 <0.1
9/16/2019 <0.1
9/17/2019 <0.1
9/18/2019 <0.1
9/23/2019 <0.1
9/24/2019 <0.1
9/25/2019 <0.1
9/30/2019 <0.1
10/1/2019 <0.1
Page 4 of 7

10/2/2019 <0.1
10/8/2019 <0.1
10/9/2019 <0.1
10/15/2019 <0.1
10/16/2019 <0.1
10/17/2019 <0.1
10/21/2019 <0.1
10/22/2019 <0.1
10/23/2019 <0.1
10/28/2019 <0.1
10/29/2019 <0.1
10/30/2019 <0.1
11/5/2019 <0.1
11/6/2019 <0.1
11/7/2019 <0.1
11/13/2019 <0.1
11/14/2019 <0.1
11/18/2019 <0.1
11/19/2019 <0.1
11/20/2019 <0.1
11/25/2019 <0.1
11/26/2019 <0.1
11/27/2019 <0.1
12/2/2019 <0.1
12/5/2019 <0.1
12/9/2019 <0.1
12/10/2019 <0.1
12/11/2019 <0.1
12/17/2019 <0.1
12/18/2019 <0.1
12/23/2019 <0.1
12/26/2019 <0.1
12/27/2019 0.3
12/30/2019 <0.1
12/31/2019 <0.1
1/2/2020 <0.1
1/6/2020 <0.1
1/8/2020 <0.1
1/13/2020 <0.1
1/14/2020 <0.1
1/15/2020 <0.1
1/21/2020 <0.1
1/23/2020 <0.1
1/27/2020 <0.1
1/28/2020 <0.1
1/29/2020 <0.1
2/4/2020 <0.1
Page 5 of 7

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T'0> OZOZ/OZ/S
L'0> OZOZ/6T/S
T'0> OZOZ/8T/S
T'O> OZOZ/ET/S
T'0> OZOZ/ZT/S
T'0> OZOZ/LT/S
T'0> OZOZ/L/S
T'0> OZOZ/9/S
T'0> OZOZ/S/S
T'0> OZOZ/b/S
T'0> OZOZ/6Z/b
L0> OZOZ/8Z/17
1'0> OZOZ/LZ/ti
L'0> OZOZ/ZZ/t7
T'0> OZOZ/TZ/b
T'0> OZOZ/0Z/b
T'0> OZOZ/ST/t
L'0> OZOZ/i7T/b
T'0> OZOZ/ET/ti
T'0> OZOZ/8/17
T'0> OZOZ/L/ti
L'0> OZOZ/9/17
T'0> 0Z0Z/L/V
T'0> OZOZ/T£/£
L'0> OZOZ/OE/E
T'0> OZOZ/SZ/E
T'0> OZOZ/bZ/E
T'0> OZOZ/EZ/E
T'0> OZOZ/8T/E
T'0> OZOZ/LT/E
L'0> OZOZ/9T/E
T'0> OZOZ/TT/E
L'0> OZOZ/OT/E
L'0> OZOZ/6/E
T'0> OZOZ/V/E
T'0> OZOZ/E/£
L'0> OZOZ/Z/£
L'0> OZOZ/9Z/Z
T'0> OZOZ/bZ/Z
T'0> OZOZ/6T/Z
T'0> OZOZ/8L/Z
T'0> OZOZ/LL/Z
1'0> OZOZ/ZT/Z
T'0> OZOZ/TL/Z
T'0> OZOZ/9/Z
T'0> OZOZ/S/Z

5/27/2020 <0.1
5/29/2020 <0.1
6/1/2020 <0.1
6/2/2020 <0.1
6/3/2020 <0.1
6/8/2020 <0.1
6/9/2020 <0.1
6/10/2020 <0.1
6/15/2020 <0.1
6/16/2020 <0.1
6/17/2020 <0.1
6/22/2020 <0.1
6/23/2020 <0.1
6/24/2020 <0.1
6/29/2020 <0.1
6/30/2020 <0.1
7/1/2020 <0.1
7/6/2020 <0.1
7/7/2020 <0.1
7/8/2020 <0.1
7/13/2020 <0.1
7/14/2020 <0.1
7/15/2020 <0.1
7/20/2020 <0.1
7/21/2020 <0.1
7/22/2020 <0.1
7/27/2020 <0.1
7/28/2020 <0.1
7/29/2020 <0.1
High 0.96
Low <0.1
Page 7 of 7