NC0082139_Application_20190213

Greenville
Utilities
February 13, 2019
NC DENR, Division of Water Quality
Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Renewal Application of NPDES Permit NCO082139
Greenville Utilities Commission; Pitt County
RECEIVED/DENR/DWR
FFR 19 2019
Walel", :30Ufcea
F'ermittin9 Section
By way of this submittal the Greenville Utilities Commission is requesting renewal of the
subject permit.
Enclosed please find an original and (2) copies of the NPDES permit application
(short form C-WTP), a schematic of flow through the facility and the sludge management
plan for this facility.
If you have any questions or need additional information, please contact Julius Patrick at
[phone].
Sincerely,
Randall D. Emory, P.E.
Director of Water Resources
Enclosures
cc: Mr. Anthony C. Cannon, General Manager/CEO
Mr. David W. Springer, P.E., Assistant Director of Water Resources
Mr. D. Anthony Whitehead, Water Quality Manager
Mr. Julius E. Patrick, Superintendent, Water Treatment Plant
PO K,x 1847
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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 INCO082139
If you are completing this form in computer use the TAB key or the up - down arrows to moue 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 Greenville Utilities Commission
Facility Name Greenville Water Treatment Plant
Mailing Address 801 Mumford Road
City Greenville
State / Zip Code NC/27835
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 1721 Waterway Road
City Greenville
State / Zip Code NC/27834
County Pitt
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 Greenville Utilities Commission
Mailing Address PO Box 1847
City Greenville
State / Zip Code NC/27835-1847
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public Z
Page 1 of 3 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
S. 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
7. Describe the treatment process(es) for the raw water:
Coagulation, Flocculation, Sedimentation, Ozonation, Filtration
S. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
The waste water consists of sedimentation basin residuals/ alum sludge, filter backwash,
continuous analyzer discharge, continuous sample tap discharge and storm water. Treatment
consists of settling from the inlet to the discharge which is a distance of about 2500 ft. over a
surface area of 23 acres.
9. Number of separate discharge points: 001
Outfall Identiftcation number(s)
10. Frequency of discharge: Continuous ® Intermittent ❑
If intermittent:
Days per week discharge occurs: Duration:
11. Plant design potable flowrate 22.5 MOD
Backwash or reject now .673 MOD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfalL including
latitude and longitudes
Tar River
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
Page 2 of 3 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Fluoride Yes ❑x No
Ammonia nitrogen / Chloramines Yes El No
Zinc -orthophosphate or sweetwater CP1236 Yes No 0
List any other additives below:
Sodium Permanganate, Powered Activated Carbon, Copper Sulfate, Sodium Hydroxide, Chlorine
DPD Reagents: (Acidic Salts, Ozone Reagents: (Malonic Acid), Potassium Acid Malonate, Ortho Phosphate,
Polyacrylamide, Sodium Hypochlorite, Ammonium Hydroxide, Calcium Thiosulfate
14. Is this facility located on Indian country? (check one)
Yes ❑ No
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].
Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-15:
New applicants are highly encouraged to 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.
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.
Randall D. Emory, P.E. Director of Water Resources
Printed n e of Pe son Signing Title 'kn'� f� /11 �
Signature of Applicant
Date
North Carolina General Statute 143-215.6 (b)(2) provgLW%t: 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 six 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 bath, for a similar offense.)
Page 3 of 3 Version 5/2012

Greenville
Utilities Greenville Utilities Commission WTP Residuals Handling Plan
Greenville Utilities Commission (GUC) existing residuals comprise of sedimentation
basin blowdown, filter backwash, and filter to waste. The residuals waste streams are all
directed to a manhole. Stormwater is also conveyed to this manhole. A 30-inch manhole
with reinforced concrete pipe runs west from the manhole into another manhole where
additional stormwater is tied in. A 36-inch reinforced concrete pipe runs west from this
manhole into an outfall at the residual lagoon. During a 10-year storm an estimated
7,400 gpm of stormwater is diverted to this pipeline, which is approximately half the
flowrate of the maximum instantaneous residual stream. The residuals lagoon is
approximately 23 acres with a depth of 14 feet from the lagoon invert to grade. With an
operating depth of 11 ft., the lagoon has a corresponding volume capacity of
approximately 350,000 cubic yards at 2.25:1 slope
GUC contracted with Hazen to conduct Preliminary Engineering Report (PER) in 2017.
The final report was produced in May 2018. The PER estimates that the lagoon has
210,000 cubic yards of solids or 60 percent full. Existing residuals management
practices, solid production estimates and evaluation of future residual management
alternatives were also included in the PER. The four residual management alternatives
were:
1. Alternative 1-Use existing lagoon -continue to direct all residuals streams to the
existing lagoon.
2. Alternative 2- Construct a new lagoon -direct all residuals streams to a new
lagoon.
3. Alternative 3- Solids Thickening and Dewatering- Direct sedimentation and future
blowdown to thickening and dewatering and continue to direct filter backwash
and filter to waste to the existing lagoon.
4. Alternative 4-Solids Thickening and Dewatering and Backwash Clarification- -
Direct sedimentation and future blowdown to thickening and dewatering and
°` "clarification for filter backwash and filter to waste.

The PER recommended that GUC select Alternate 1-continue to send all residuals
stream to existing lagoon. Also, a recommendation that GUC staff annually dredge new
solids that are collected to maintain the current lagoon functionality and capacity. GUC
had previously established a residual lagoon improvement capital project prior to the
PER. In December 2018, GUC proceeded with a request for bids for sludge removal
from the residual lagoon. A -contract was awarded January 31, 2019 for removal of
approximately two times the annual average sludge production. GUC long term plan is
to remove twice the annual average solid production annually to restore additional
capacity in the current lagoon and future WTP expansion.

GREENVILLE UTILITIES WATER TREATMENT PLANT PROCESS DIAGRAM
RAW WATER RAW WATER BYPASS
'CHEMICALS ARE FED ONLY AS NEEDED '•FED ONLY DURING FILTER BACKWASH FINISHED WATER PUMP STATION

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>< �' �' • __ _ ,Eao t Approximate
` �. e•. 1' 6 � . `\ • � : s 33 `.-`, Facility Boundary
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Water `I✓
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Greenville Utilities Commission
Facility
Greenville Water Treatment Plant
Location
1721 Waterway Road, Greenville NC 27835
scale 1:24,000
Receiving Stream: Ter River Strum Class:
C; NSW
Stream Segment; 28{94) Sob -Basin:
03.OM5
r,rainsee Basin: Tar-1°emlino HIC,
03020103
NPDES Permit NCO082139
Latitude; 35' 39' 04' n i de:
71° 23' 55'
North
State Grid(USGS Ouad: E29NW/ Omenville NW, NC
Pitt County