NC0085511_Renewal (Application)_20150526

City of Asheville, NC
1.
Mills River Water Treatment Facility
Mills River Water Treatment Plant—City of Asheville
4037 Haywood Rd
Mills River, NC 28759 RECEIVED/DENR/DWR
May 22, 2015 MAY 2 6 2015
Water Wren Thedford Permitting Section
NC DENR/ DWR/ NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Mr. Thedford,
Please renew NPDES permit# NC0085511 for the Mills River Water Treatment Facility. There
are no expected changes in the nature and volume of the waste to be treated. Attached are the
completed application forms and our sludge management plan.
Sinc ely,
Reginald Widemon
Mills River Water Treatment Plant Supervisor

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 RECEIVED/DENR/DWR
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617 MAY 2 6 2015
NPDES Permit Number NC008551 I Water Qua�ec ion
Permitting e
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 Asheville N.C.
Facility Name Mills River Water Treatment Faciliy
Mailing Address 4037 Haywood Road
City Mills River
State / Zip Code N.C./28759
Telephone Number (828-232-4574)
Fax Number (828-232-4590)
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above
Street Address or State Road
City
State / Zip Code
County Henderson
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
Mailing Address
City
State / Zip Code
Telephone Number (
Fax Number ( )
4. Ownership Status:
Federal ❑ State 0 Private 0 Public
5. Type of treatment plant:
Page 1 of 4 C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
El 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
7. Describe the treatment process(es) for the raw water:
Water is drawn from the Mills River and pumped to an untreated water storage reservoir
where suspended materials are settled out. The settled water is pumped to the pre-
ozonation system to begin disinfection where ozone gas is used to eliminate pathogens
and other bacterial contamination. The water then flows to the rapid mix and flocculation
basins where aluminum sulfate and sodium hydroxide are added to produce suspended
particles. Sedimentation follows where suspended particles settle to the bottom of the
sedimentation basin. The water then proceeds to another ozonation chamber for further
disinfection as well as taste, color, and odor control. Next, the water flows through filters
containing granular activated carbon where the media traps suspended solids and adsorbs
other organic material in the water. Following filtration, a small amount of sodium
hypochlorite is added for disinfection and to prevent the reintroduction of pathogens into
the drinking water. Enough is added to maintain a minimum residual concentration
throughout the distribution system. Fluoride is added to prevent tooth decay, sodium
bicarbonate and zinc orthophosphate are added for corrosion control and sodium
hydroxide to control pH. The inclusion of sodium bicarbonate also increases the buffering
capacity of water thereby helping to prevent pH swings in the distribution system.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
The wastewater is process water primarily from filter backwashes and periodic sludge
discharges from the sedimentation basins. This wastewater flows to a lagoon where the
suspended solids are allowed to settle and the supernate flows to the river. Each year, a
predetermined amount of sludge solids and liquid is contracted for removal from the
lagoon and the solid/liquid waste is delivered to the local sewerage treatment facility.
9. Number of separate discharge points: 1
Outfall Identification number(s) 001
10. Frequency of discharge: Continuous ® Intermittent El
If intermittent:
Days per week discharge occurs: Duration:
11. Plant design potable flowrate 7.5 MGD
Backwash or reject flow 0.05 MGD
Page 2 of 4 C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
French Broad River
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Aluminum sulfate, sodium hydroxide
Sodium hypochlorite, sodium bicarbonate
Hydrofluosilic acid
Zinc orthophosphate
Sodium thiosulfate, lime (calcium hydroxide)
14. Is this facility located on Indian country? (check one)
Yes ❑ No El
15. Additional Information:
• Provide a schematic of flow through the facility, include flow volumes at all points in
the treatment process, and point of addition of chemicals.
• Solids Handling Plan
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 0 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 a d belief such information is true, complete, and accurate.
/..
..weet 440,40.112
Water Plant Supervisor
Prin name of Person Signing Title
Page 3 of 4 C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Signature of Applicant 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 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 both,
for a similar offense.)
Page 4 of 4 C-WTP 03/05

I
Ttaik
•t 1
I _ -4:4+0.1.C--.1t IA �,.rte_ 't �. -. I 1 V
P
t
,._ 1 , ytvd - ;-
r t , ( I t`t.- N c- . ti -. ''), "l'-
NC O C 8 5 511 ••• , .Lc
. ' -/d "
fiDischarge ,' ;i'.:, . `..• ,
i Wit I ii./7 } ~_� 1 . i :.-f
0.
� 1\EIS River 7N.1.1, • , ., :� ., ,., 1,
NC0085511 •• :• '. ' 4 �i • ,..1,7,7-:,.:,
; . r.-- •,_;,
Aft a• t/ J t_4•n; . _ ;�.i `:
I ♦�
cr -tea` ' .� i tiE
4
._----3, (lU o2 ',t"10 gale i -tit r tl/�� r—--1 •:),6 11.---,) \-1,--\--=..„-.'..:_'---'
/ f
—f,,GN. `.— 171 . --F_. !'"j t}t 1`,, ..•!'
:.•!� i..r'f i' { ` .
cA�
fit. - •' . �\ { it f{ •� C = y` Y': . �" i?
.r t ..- �4 I- ..k--- �.1 ', 4- •-:�t :_i tir e • Sg"
bre
. rear. -_ 4„ /,11.7, --)t( \- d '; ,Ci ze- /7 •..
USGS Quad: F8NE Skyland, NC
Outfall Facility t •
Latitude: 35° 23' 14.5"N 35°22' 43.6"N
-...,...1, ;
Longitude: 82° 31' 56.4" W 82° 32' 46.4" W
Stream Class: WS-IV, B, CA North Facility Location
Subbasin: 04-03-02 HUC: 06010105 Mills River WTP NC0085511
Receiving Stream: French Broad River Henderson County

OVERVIEW OF THE MILLS RIVER WATER TREATMENT PLANT
Aluminum Sodium
Sulfate Hydroxide
(Alum) (Caustic)
I
..-1-1 - ,.
Reservoir
r
Mills River , ;���i I Rapid Flocculation Tanks ' Sedimentation Basins (3)
I �� Ozone Mix Tanks
',i' i
Sodium Hypochlorite
i
i
Sodium Bicarbonate — i
Fluoride
Zinc '
Ortho Filters (3)
Phosphate _a__I -.FF._rrx,...`
_.,. 1'
-
Clearwell t' _..1
Sodium i
i
Hydroxide i
(Caustic) i
' > To Distribution
Lagoons
3.,
To French Broad River

., - .., City of Asheville, NC
.111 ,
1
Mills River Water Treatment Facility
SLUDGE MANAGEMENT PLAN
The facility's waste water is primarily generated during the filter backwash process.Treated/filtered
water is used to back flush the filters.The contaminants that are removed plus the water used for
backwashing, drains to one of two lagoons located on the premises. Once in the lagoon,the suspended
solids are allowed to settle to the bottom and the supernatant flows to the French Broad River. In
addition to backwashes, the contamination flushed out during wash ups and spill clean ups,filter
excursions that initiate the filter to waste sequence, leaks and the daily discharge of sludge that
accumulates in the sedimentation basins also contribute to sludge/waste generation. Once a year a
commercial firm is contracted to dredge, dewater and remove the sludge from the lagoon.The
liquid/solid waste that is removed is delivered to the local sewerage treatment plant for
processing/disposal.
41:(.4420 iji4441-4°11--
Reginald Widemon
Mills River Water Treatment Plant Supervisor

Aidi
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory Donald R. van der Vaart
Governor Secretary
May 27, 2015
Reginald L.Widemon
Mills River WTP
4037 Haywood,Rd
Mills River,NC 28759
Subject: Acknowledgement of Permit Renewal
Permit NC0085511
Henderson County
Dear Permittee:
The NPDES Unit received your permit renewal application on May 26, 2015. A member of the
NPDES Unit will review your application. They will contact you if additional information is required to
complete your permit renewal. You should expect to receive a draft permit approximately 30-45 days
before your existing permit expires.
If you have any additional questions concerning renewal of the subject permit, please contact Joe
Corporon(919) 807-6394.
Sincerely,
Wsre rvTIS-eo( rd,
Wren Thedford
Wastewater Branch
cc: Central Files
Asheville Regional Office
NPDES Unit --•
1617 Mail Service Center,Raleigh,North Carolina 27699-1617
Location:512 N.Salisbury St.Raleigh,North Carolina 27604
Phone:[phone] Fax:[phone]/Customer Service:1-877-623-6748
Internet::www.ncwater.ory
An Equal OpportunitylAffirmative Action Employer