NC0026000_Updated Mercury Minimization Plan_20180606

rDI�CI<SON
community infrastructure consultants
June 4, 2018
Ms. Morella Sanchez King, PhD, PE
Environmental Program Supervisor III
NCDEQ-Wilmington Regional Office/Water Quality Operation Section
127 Cardinal Drive Extension
Wilmington, NC 28405
RE: Updated Compliance Evaluation of the Mercury Minimization Plan
Town of Tabor City WWTP/NPDES Permit No. NC0026000
Columbus County
Dear Ms. Sanchez King:
On behalf of the Town of Tabor City, we are pleased to provide updated information
regarding the Town's ongoing compliance with its Mercury Minimization Plan.
1. Supporting documentation showing the progress and status of activities listed in
Section III of the MMP.
Since January 2016, the Town has continued to maintain compliance with the NPDES
permit limit (12 ng/L for 12-month average). The table below details the monthly
mercury sampling results for the 3 required sampling points: influent, mixed liquor
suspended solids (MLSS) and effluent. A 12-month running average for these effluent
samples is also included in the table. As of March 2018, the running annual average
for mercury (effluent) is 3.92 mg/L and no changes in mercury influent levels have
been detected.
The Town has maintained information on its website that provides details to residents
and wastewater customers regarding minimizing the potential for discharging
mercury into the wastewater system. The information is provided by the USEPA and
outlines what routine products may contain mercury and what individuals can do to
reduce impacts. No new industrial users have been added to the Town's wastewater
system since the last update was provided.
616 Colonnade Drive
Charlotte, NC 28205
Tel. [phone]
www.wkdickson.com
Aviation • Water Resources • Land Development • Geomatics

NCDEQ-WRO Response: Tabor City WWTP (NC0026000)
June 4, 2018
Page 2
Tabor City WWTP (NC0026000) Mercury Results 1/2016 - 3/2018
Date
Influent Mercury
(ng/L)
MLSS Mercury
(ng/L)
Effluent
Mercury (ng/L)
12-month Effluent
Mercury Average
Jan-16
800
1300
2.81
Feb-16
<200
1000
4.09
Mar-16
<200
1100
1.28
Apr-16
<200
1100
1.68
May-16
<200
1800
3.8
Jun-16
<200
1900
9.96
Jul-16
<200
1400
3.08
Aug-16
<200
<1000
6.66
Sep-16
<200
2200
7.19
Oct-16
<200
1000
1.75
Nov-16
<200
1500
2.31
Dec-16
200
2000
4.2
r 4.07
Jan-17
200
1700
3.41
r 4.12
Feb-17
<200
1400
2.38
r 3.98
Mar-17
<200
2100
2.37
r 4.07
Apr-17
<200
1100
1.72
r 4.07
May-17
200
4900
4.67
r 4.14
Jun-17
200
1100
3.3
r 3.59
Jul-17
<200
900
8.44
r 4.03
Aug-17
<200
2500
5.04
r 3.90
Sep-17
<200
700
5.15
r 3.73
Oct-17
<200
1000
2.16
r 3.76
Nov-17
<200
700
2.48
r 3.78
Dec-17
<200
800
5.26
r 3.87
Jan-18
<200
900
2.78
r 3.81
Feb-18
<200
1400
1.14
r 3.71
Mar-18
<200
<200
4.86
r
3.92

NCDEQ-WRO Response: Tabor City WWTP (NC0026000)
June 4, 2018
Page 3
Please let me know if you have any questions or comments regarding this update. You may
contact me at 843-540-1015 or [e-mail].
Sincerely,
WK Dickson & Co., Inc.
Angela G. Mettlen, Program Manager
cc: Al Leonard, Town Manager - Town of Tabor City