NC0020443_Annual Report_20220302

Town of Columbia
Annual Wastewater Report RECEIVED
2021 MAR 0 2 2022
General Information:
NCDEQIDWRINPDES
Name of Regulated Entity:
Town of Columbia Wastewater Treatment Plant
Responsible Persons:
Rhett White Kenneth L. Coleson
103 Main St. 103 Main St.
Columbia, NC 27925 Columbia, NC 27925
Phone: [phone] Phone: [phone]
Permits:
NPDES# N00020443
Description of Treatment Process:
Columbia Wastewater Treatment Plant is a Grade II activated sludge treatment plant utilizing
two 375,000 gal. Oxidation ditches supplying four 65,000 gal. primary clarifiers, 12,000 gal.
effluent holding tank, flow paced sodium hypochlorite chemical feed disinfection, two 11,500
gal. post aeration basins with sodium bisulfate chemical feed dechlorinating system, 52,000
gal. sludge digester tank, a 154,000 gal. sludge holding tank and a 200,000 gal. sludge holding
tank.
Number of Reportable NPDES Permit Violations:
1
Explanation of Reportable NPDES Violation:
The Enterococci Avg Monthly limit was .5m1 over the limit for the month of July
Highlights:
Columbia Wastewater Plant achieved a 99.9% BOD removal and a 99.8%TSS removal on
average for the 2020 year.

Columbia Wastewater Plant Performance Sheet 2021
Parameter Flow Bod In BOD Out TSS In TSS Out Temp. pH Out ECX Out Residule Cl2 NH3-N D.O. Total N Total P NO2NO3 TKN
Unit of Measure MGD Out mg/L mg/L mg/L mg/L °C su cfu/100ml ppb mg/L mg/L mg/L mg/L mg/L mg/L
Permit Limits 0.6 None 7 None 30 None 6.8-8.5 35 49 daily 2 >6.0 daily None None None None
January 0.213 151 0.76 83.9 9.18 8 7.7 9.1 18 0.16 10.1
Febuary 0.268 64 0.16 54 10.6 8 7.8 8.9 34 0.16 13.54
March 0.175 85 0.4 84.2 7.3 11 7.7 8.7 27 0.05 13.79 11.83 0.29 11.1 0.73
April 0.154 182 0 150.6 4.96 15 7.6 3 25 0.06 12.32
May 0.132 170 0.56 128.7 3.09 19 7.6 1.5 18 0.08 10.88
June 0.258 159 0.5 107.6 2.95 23 7.8 18.8 19 0.07 9.01 35.41 2.13 33.9 1.51
July 0.228 278 0 159.6 3.18 25 7.6 35.5* 24 0.12 8.32
August 0.288 145 0 79.5 3.09 25 7.3 25.1 17 0.1 8.1 26.37 1.55 25.6 0.77
September 0.154 144 0 68.4 3.26 23 7.9 5.2 18 0.09 8.59
October 0.153 206 0 133 3.02 19 7.3 1.5 19 0.09 8.63
November 0.105 165 0.36 86.4 3.04 12 7.6 1 20 0.1 11.14 28.95 1.57 27.8 1.15
December 0.116 153 0.32 96.3 5.79 11 7.5 2.7 20 0.08 11.83
Yearly Min. 0.105 64 0 54 2.95 8 7.3 1 17 0.05 8.1 11.83 0.29 11.1 0.73
Yearly Max 0.288 278 0.76 159.6 10.6 25 7.9 35.5 34 0.12 13.79 35.41 2.13 33.9 1.51
Yearly Avg. 0.179 158 0.25 102.6 10.7 16 7.6 10 21 0.92 10.52 25.64 1.38 24.6 1.04
*Value above permit limit

Town of Columbia
nf.uent Wastewater Treatment Plant
wastewater604 Road St. Ext.
Columbia, NC
vimpinnummer
Griti emodim
Removal
375,000 gal. 375,000 gal.
Oxidation �"'�� Oxidation
Ta' - Ditch Ditch
Returned Act vated S.udge
Numemormodi
65,000 gal. 65,000 gal. 65,000 gal. 65,000 gal.
Clarifier Clarifier Clarifier \ Clarifier
10,000ga
Return
Act-vated
S'udge
k
2 15hp
200,000 gal. 154,000 gal. Centrifuge
52,000 gal. Return
Sludge Holding Sludge Holding Digester
Tank Tank g Activated
Tank Sludge
Pumps
2 50hp Verticle Turbine 2 5gph 12,000 gal. Effluent
300 kW Pumps Discharging To fFeed Wastewater
EmergencyThe Outfall Site Feed
Pumps
Holding Tank
Generator I'
40, Ch or Hated Ef1 uent
Wastewater

Town of Columbia Outfall Site
506 Green St. j
ir Columbia, NC 4
11,500 gad, 11,500 gat.
Post Post
Aeration Aeration
Basin Basin
Sodium Bisulfate
Feed Chamber
10,000 gal.
65 kW Sodium Bisulfate
Emergency Dechlorination
Generator Tank
2 2.5 gph Chemical
Ic
eed Diaphram Pumps
2 20 hp Verticie Turbine Pumps
Discharging To The Scuppernong River
Dechlorinated Treated
Wastewa er

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Town of Columbia
Addendum to Annual Wastewater Report
Collections System
2021
General Information
Name of Regulated Entity:
Town of Columbia Collections System
Responsible persons:
Rhett B. White Kenneth L. Coleson
Town Manager ORC
103 Main St. 103 Main St.
Columbia NC, 27925 Columbia, NC 27925
Phone: [phone] Phone: [phone]
Permits:
NPDES# NC 0020443
Description of System:
The Columbia sewer collections system consists of five town maintained pumping stations
(including the WWTP influent pumping station) and 63,626 ft. of sewer lines with 185
manholes.
Reportable Violations:
0
Last Reportable Violation:
April 6, 2020

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being designated ORC, certify under penalty of law that this
report is complete and accurate to the best of my knowledge. I further certify that this report
has been made available to the users and customers of the named system and that those users
have been notified of its availability.
Responsible Person Date
Title
Public Notification Method:
Public notice of availability will be posted in the "The Coastland Times".