NC0028037_Renewal (Application)_20131003

of Lexington,
!nt of Water F
October 3, 2013
Attention: Mr. Charles H Weaver
NC DENR / DWQ/ NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: City of Lexington, NC
Davidson County
NPDES permit application—NC0028037
Lexington Water Treatment Plants #1 and #2
OCT 9 2013
Wsmo
RECEIVED
N.C. Dept. of ENR
OCT 15 2013
Winston-Salem
Regional Office
Dear Mr. Weaver:
Please find attached the renewal application and its attachments for the City of Lexington's
Water Treatment Plants #1 and #2. Also attached are two copies of this application package.
Let me use this opportunity to notify the state that it is our intention to increase the drying bed
capacity for this facility by 50% within the next two years. Plans for this will be submitted with
the request for an authorization to construct in 2014.

A
Please forward requests for additional information and corrections to my attention at 336-248-
3970 or at my new email address [e-mail].
Sincerely,
Roger Spach, Superintendent
Cc: Larry Shoaf, Water Plant Supervisor
Richard Comer, Public Services Director — w/o attachments

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NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO028037
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name
City of Lexington
Facility Name
Water Treatment Plants # 1 & #2
Mailing Address
28 West Center Street
City
Lexington
State / Zip Code
NC/27292
Telephone Number
[phone]
Fax Number
[phone]
e-mail Address
[e-mail]
2: Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 2979 Old Greensboro Street Extension
City
Lexington
State / Zip Code
NC/27292
County
Davidson
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name City of Lexington, NC
Mailing Address 28 West Center Street
City Lexington
State / Zip Code NC
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public
Page 1 of 4
Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
5. Type of treatment plant:
® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) (i.e. groundwater, surface water)
Surface Water - Abbotts Creek/Lake Thom-A-Lex
6. Describe the treatment process(es) for the raw water:
7.
Potassium permanganate and powdered activated carbon pretreatment; pH adjustment
coagulant addition (alum); flash mix; flocculation; sedimentation; filtration; pH
adjustment, chlorination; corrosion inhibitor addition, fluoride addition; storage (ground
and elevated)
S. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Sedimentation ponds ; decant supernatant from these ponds; pump sludge from these
ponds with polymer added into to sand drying beds; dechlorination
9. Number of separate discharge points: 1
Outfall Identification number(s) 01
10. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: 5 to 7 Duration: as needed
11. Plant design potable flow rate 9.4 MGD
Backwash or reject flow 0.246 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitudes See attached
Abbotts Creek
Page 2 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Alum / aluminum sulfate Yes X No
Iron sulfate / ferrous sulfate Yes No X
Fluoride Yes X No
Ammonia nitrogen / Chloramines Yes No X
Zinc -orthophosphate or sweetwater CP1236 Yes X No
List any other additives below:
Potassium Permanganate; PAC, alum, polymers; sodium hypochlorite; corrosion
inhibitor (polyphosphate); lime slurry; sodium hydroxide; sodium thiosulfate
(dechlorination)
14. Is this facility located on Indian country? (check one)
Yes ❑
i . /0/
15. Additional Information:
Provide a schematic of flow through the facility, include flow volumes at all points in
the water treatment process. The plan should show the point[s] of addition for
chemicals and all discharges routed to an outfall [including stormwater]. Attached
Solids Handling Plan Attached
16. NEW Applicants
Information needed in addition to items 1-15:
New applicants must contact a permit coordinator with the NCDENR Customer
Service Center.
Was the Customer Service Center contacted? ❑ Yes ❑ No
Analyses of source water collected
Engineering Alternative Analysis
Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
Page 3 of 4
Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
17. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
Roger SRach Superintendent
Printed name of Person Signing Title
YU-r'�Q) / o l3
Signature of
Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false statement representation, or certification in any application,
record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21
or regulations of the Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to exceed $25,000, or by
imprisonment not to exceed sic months, or by both. (18 U.S.C. Section 1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5
years, or both, for a similar offense.)
Page 4 of 4 Version 5/2012

V
Lake
Thom-A-Lex
2.846 M G D
Distribution
System
2.60MGD
Schematic of Lexington Water Plants #1 & #2
Flash
n mix
Potassium permanganate
PAC
Polymer
Alum
Sodium Hydroxide
Lime slurry
Sodium hydroxide
Lime slurry
% Flocculation
Clear Wells
—��.—Sedimentation
,
,
,
.246
qD TOJudge
r
,,'Handling
r system
rr
Sodium hypochlorite
Fluoride ;
r
r
r
r
<-- Filtration

1
Schematic of Sludge Handling System/Effluent
Calcium
Thiosulfate
pol mer
0.246 Sand
MGD�� Sludge Drying ---� De -
From Lagoons 40,
Beds chlorination
Plants #1
& #2
Sludge to
Davidson
County Landfill
.246 M G D
Effluent to
Abbott's
Creek