NC0040070_Fact Sheet_20190416

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
This form must be completed by Permit Writers for all expedited permits which do not require
full Fact Sheets. Expedited permits are generally simple 100% domestics (e.g., schools, mobile
home parks, etc) that can be administratively renewed with minor changes, but can include
facilities with more complex issues (Special Conditions, 303(d) listed water, toxicity testing,
instream monitoring, compliance concerns).
Basic Information for Expedited Permit Renewals
Permit Writer / Date
Brianna Young 4/16/19
Permit Number
NCO040070
Facility Name / Facility Class
Two Rivers Utilities WTP Alum De -watering
Facility / PC-1
Basin Name / Sub -basin number
Catawba / 03-08-36
Receiving Stream / HUC
UT to Long Creek / 0305010206
Stream Classification / Stream Segment
C / 11-129-16- 4
Does permit need Daily Maximum NH3
limits?
N/A
Does permit need TRC limits/language?
Alread resent
Does permit have toxicity testing? IWC (%) if
so
Yes; IWC = 90%
Does permit have Special Conditions?
Yes; condition for restarting discharge
Does permit have instream monitoring?
No
Is the stream impaired on 303 d list)?
Yes; see below
Any obvious compliance concerns?
None
Any permit mods since lastpermit?
None
New expiration date
1/31/2024
Comments on Draft Permit?
Facility Overview:
The City of Gastonia — Two Rivers Utilities operates a conventional WTP (coagulation,
sedimentation, and filtration) with discharge of wastewaters from filter backwash and
sedimentation basins. The designed potable flowrate is 23.3 MGD and design wastewater
discharge is 0.75 MGD. The facility generates backwash with an intermittent discharge.
There was only 1 month of discharge between January 2014 and December 2018, which
occurred in January 2018, and resulted in a monthly average discharge of approximately
0.313 MGD. This facility was granted a monitoring waiver in June 2018 effective May 1,
2018 as the facility pumps their wastewater to the Long Creek WWTP.
Per the permittee: Due to catastrophic equipment failures on January 6, 2018, the
permittee requested their NPDES Permit be reactivated to allow for discharge to the
designated stream until permanent repairs could be planned and completed. The repairs
were completed in January 2018, and they have not discharged since January 19, 2018.
Water and wastewater treatment consists of.
• Coagulation with aluminum sulfate (alum)
• Disinfection with sodium hypochlorite

• Sedimentation
• Filtration
• pH adjustment with sodium hydroxide
• Corrosion control with sodium bicarbonate, hexameta-phosphate, and
orthophosphate
• Two (2) 0.600 MG sedimentation basin
• Dechlorination with sodium thiosulfate
• Additional chemical treatment consisting of.
o Fluoride in finished water
o Polymer in wastewater (for sludge settling)
303(d) listing:
Long Creek From Mountain Creek to South Fork Catawba River
11-129-16-(4) C 15.3 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria Fair Fish Community 5
(Nar, AL, FW)
Compliance History:
• There are no NOV or enforcements January 2014 to December 2018
• Limited monitoring was performed during the January 2018 discharges
o Contacted MRO 1/23/19 to determine if there was communication
allowing permittee to not monitor for everything required in the permit
o Response from Ori Tuvia (MRO; via email 1/24/19): I don't have it in
writing but I recall at the time he sampled only the items listed. On later
time it was mentioned that the missing quarterly sampling but was
instructed not to discharge just to sample.
There are no tox test results from January 2015 to October 2018 — all months
reported no flow
o They had discharge in January 2018, and that is a month they are required
to report per the permit
o Contacted aquatic toxicity group 1/23/19 to determine if there was
communication allowing permittee to not monitor for toxicity in the event
of a discharge
o Response from Susan Meadows (Aquatic toxicity; via email 1/25/19): I
don't know anything about this. I don't ever recall conversing with them
because they don't normally discharge. I looked in BIMS as well and it
appears they didn't test for anything except Chlorine. Only thing I know to
tell you is to talk with the MRO, which it sounds like you already
have ... Not sure what to think.
RPA:
The maximum monthly average flow between January 2014 and December 2018 was
approximately 0.313 MGD (discharge only occurred in January 2018).

• Limited monitoring was performed during discharge events, therefore there is no
data to run an RPA on
NCG59 General Permit Eligibility:
• There is a lack of toxicity data, therefore they are not eligible by tox standards
• Conclusion: They are not eligible for the NCG59
Changes from previous permit to draft:
• Updated eDMR footnote in A(1) and language as A(4)
• Updated outfall map
• Updated language on the Supplement to Permit Cover Sheet (added stream
characteristics, updated components list, updated discharge descriptions)
• Facility grade added in A(1)
• Limit removed for turbidity in A(1) as receiving stream is not impaired for
turbidity, and monitoring decreased to 2/month per 2012 WTP guidance
• Added monitoring for hardness and associated footnotes in A(1) per WTP
guidance
• Removed former footnote #2 in A(1) stating "The City will have 18 months from
the effective date of this permit to install a continuous flow meter. Until then
instantaneous measurements can be taken with the duration of discharge to be
noted in log books and a total daily discharge reported on the DMR" as the
deadline has passed
• Removed former footnote #4 in A(1) stating "Samples shall be collected
concurrently with WET -test samples" as this is no longer required
• Changed tox test in A(1) and A(2) from chronic 7-day to acute 48-hour based on
discharge schedule and per toxicity group recommendation
Changes from draft to final:
• None
Comments received on draft permit:
• Ori Tuvia (MRO, via email 1/17/19): The facility for the most part does not
discharge, only discharge in case of an emergency or some maintenance is needed
(usually flow is pumped to the city's WWTP). For that reason, not knowing what
month the emergency would accrue I believe their sampling requirement for
chronic toxicity should be quarterly but not in specific months as listed in the
footnote.
o DWR Response: The specified months are probably from when the
permit was issued and likely determined by the aquatic toxicity group. I
believe months need to be included as the standard tox permitting

language available to us requires it, and to my knowledge, other facilities
that only discharge in emergency situations still have months specified for
their toxicity testing. I can reach out to the tox folks, though, and get their
thoughts.
• Susan Meadows (via email 3/7/2019). So, your intent is to change from Chronic
Monitoring only Cerio 7 day PF @ 90% to Acute Monitoring only Cerio 48 hr PF
@ 90%, correct?
o DWR Response: Yes, that is correct. Given their infrequent discharge, the
7-day chronic test did not seem the appropriate test to use. Between 2014
and 2018, they only discharged in the month of January 2018 due to
catastrophic equipment failure. This discharge event lasted from January
7, 2018 to January 19, 2018 while repairs were conducted. Please let me
know if you think otherwise.
o Susan Meadows Response (via email 3/7/2019): I agree and think it
looks good.

PUBLIC NOTICE
North Carolina
Environmental
Management
Commission/
NPDES Unit
1617 Mail Service
Center
Raleigh, NC
27699-1617
Notice of Intent
to Issue a
NPDES
Wastewater
Permit ' .
The North Carolina Envi-
ronmental Management
Commission proposes to
issue a NPDES waste-
water discharge permit to
the person(s) listed below.
Written comments regard-
ing the ProP�d perrnit
will be accepted until 30
days after the publish data
of this notice. The Director
of the NC Division of Water
Resources (DWR) may`
hold a public hearing
should there be a signifl-
cant degree of public inter-
est. Please mail comments
andror information re-
quests to DWR at the
above address. Interested
persons may visit the DWR
at 512 N. Salisbury Street,
Raleigh, NC to review in-
formation on file. Addf
tional information on
NPDES permits and this
notice may be found on our
website: M:# dea.nc.aov/
about/divisions/water-resou
rces/water-resources f r
tr mIewater branch/rmode
F WcnStgjt,^!E..r :#q-n0fM
or by calling (919)
7w-wi. The City of
Gastonia -Two Rivers Utili-
ties, Gaston County, ap-
plied to renew NPDES per-
mit , NCO040070 for its
water treatment plant - dis-
charging treated
fitter -backwash wastewater
to an unnamed tributary to
Long Creek in the Catawba
River Basin. This dis-
charge may affect future
allocations in this portion of
Long Creek.
3/9, 2019
54598754
AFFIDAVIT OF INSERTION OF ADVERTISEMENT
The Gaston Gazette
Gastonia, N.C.
Gaston County
The Gaston Gazette does certify that the advertisement for:
PUBLIC NOTICE North Carolina Environmental Management Commission/ NPDES Unit
1617 Mail Service
Measuring 7.76 inches appeared in The Gaston Gazette, a newspaper published in
Gaston County, Gastonia, N.C., in issue(s):
03/09/2019
Name of Account: NCDENR-Division of Water Resources - Gazette
Order Number: 54598754
Ad Number: 54735636
Sworn to, and subscribed before me this 13 th day of March, 2019,
Print Name (Classifiel Representative) Signatu(e ified Representative)
--Lp�aasi �-LA
Stephanie B. Sisk, Notary Public
lvly Commission Expires March 23, 2020

MONITORING REPORT(MR) VIOLATIONS for:
Permit: nc0040070 MRS Between 1 - 2014 and 1 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: % L
Violation Category%
Subbasin:%
Report Date: 01/18/19 Page: 1 of 1
Program Category:
Violation Action: %
PERMIT: FACILITY: COUNTY: REGION:
MONITORING OUTFALU VIOLATION UNIT OF CALCULATED %
REPORT PPI LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION

Water Resources
iENWeRONMENTAL QUALITY
June 22, 2018
Edward Cross, Division Manager
City of Gastonia
PO Box 1748
Gastonia, NC 28053
Subject: Permit Renewal
Application No. NCO040070
Two Rivers Utilities WTP
Gaston County
Dear Applicant:
ROY COOPER
G�nrernaT
NIICHAEL. S- REGAN
Secret
L=A CULPEPPER
lWerim Dtracwr
The Water Quality Permitting Section acknowledges the June 22, 2018 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW
permitting branch. Per G.S. 15OB-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit.
The permit writer will contact you if additional information is required to complete your permit renewal. Please respond
in a timely manner to requests for additional information necessary to allow a complete review of the application and
renewal of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deq.nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Siincce�erely,
'-21W
'6a4-kJ
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application(MRO)
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carohna 27699-1617
919-807-6300

NC DENR / DWR / NPDES
Renewal Application Checklist
The following items are REQUIRED for all renewal packages:
o A cover letter requesting renewal of the permit and documenting any changes at the facility since
issuance of the last permit. Submit one signed original and two copies.
o The completed application form (copy attached), signed by the permittee or an Authorized
Representative. Submit one signed original and two copies.
o If an Authorized Representative (such as a consulting engineer or environmental consultant) prepares
the renewal package, written documentation must be provided showing the authority delegated to the
Authorized Representative (see Part II.B.11.b of the existing NPDES permit).
o A narrative description of the sludge management plan for the facility. Describe how sludge (or other
solids) generated during wastewater treatment are handled and disposed. If your facility has no such
plan (or the permitted facility does not generate any solids), explain this in writing. Submit one signed
original and two copies.
The following items must be submitted by any Municipal or Industrial facilities discharging
process wastewater:
o Industrial facilities classified as Primary Industries (see Appendices A-D to Title 40 of the Code of
Federal Regulations, Part 122) and ALL Municipal facilities with a permitted flow >_ 1.0 MGD must
submit a Priority Pollutant Analysis (PPA) in accordance with 40 CFR Part 122.21.
The above requirement does NOT apply to non industrial facilities.
Send the completed renewal package to:
Wren Thedford
NC DENR / DWR / NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RECEIVEDMENRIDWR
JUN 22 2M
Water Resources
Permitting Section

TWO
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UTILITIES
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We are TR U to our customers!
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June 18, 2018
=
Ms Wren Thedford
NC DENR / DWR/ NPDES Unit
1617 Mail Service Center RECENEDIDENPOWR
Raleigh, NC 27699-1617
JUN 5 % 2018
Water PkeSource n
p,,rm►ttjng
Ms. Thedford,
The City of Gastonia -Two Rivers Utilities is requesting renewal of its NPDES permit #NC0040070 for
the Two Rivers Utilities Water Treatment Plant's Alum Sludge De -watering Facility. Please find
attached the permit request, the permit application form, our process description narrative, and
copies as requested. The current permit will expire January 31, 2019. There have been no changes
to this facility or equipment since the last renewal.
If additional information is required, please contact me at [phone].
Your assistance in this matter is greatly appreciated.
C Edward Cross, Division Manager
Water Supply & Treatment Division
City of Gastonia —Two Rivers Utilities
pc: File

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 INCO040070
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
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
City of Gastonia - Two Rivers Utilities
City of Gastonia - Alum De -watering Facility
NRIDWR
P.O. Box 1748
Gastonia JUN 22 Z018
28053 Water Resources
Permitting Section
704-866-6827
704-854-6685
[e-mail]
2. Location of facility producing discharge:
Check here if same as above
Street Address or State Road
City
State / Zip Code
County
298 West Page Ave.
Gastonia
NC 28052
Gaston
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 Gastonia
Mailing Address P.O. Box 1748
City Gastonia
State / Zip Code NC 28053
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 (Mt. Island Lake)
7. Describe the treatment process(es) for the raw water:
Raw Water is pumped to the WTP from Mt. Island Lake. Aluminum Sulfate (Alum) and Sodium
Hypochlorite are added for coagulation and disinfection respectively. After coagulation,
sedimentation and filtration, Sodium Hydroxide is added for pH adjustment, sodium
bicarbonate, hexameta-phosphate and ortho-phosphate are added for corrosion control, fluoride
is added as a dental health aid and Sodium Hypochlorite is added to maintain a chlorine
residual in the distribution system.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Sedimentation basin washwater and filter backwash water are sent to the Alum Sludge De
watering Facility via a gravity discharge line from the WTP. When the sedimentation basins are
cleaned, the effluent is discharged to the Alum Sludge De -watering Facility and a polymer is
added to assist in sludge settling. After the sludge has settled (usually 3-5 days) the clear water
is decanted to the creek. When the sludge tank (tank #2) is full, the sludge is addressed as in the
attached Sludge Management Plan.
When a filter wash occurs, the effluent is discharged to the Alum Sludge De -watering Facility
(tank #1). There is no coagulant aid needed as the filter backwash contains very little sludge.
After the sludge has settled (usually 2-4 hours) the clear water is dechlorinated with sodium
thiosulfate and decanted to the creek. Any sludge is transferred to the sludge tank (tank #2) and
addressed as in the attached Sludge Management Plan.
9. Number of separate discharge points: 1 Outfall Identification number(s) 001
10. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: 7 Duration: 4-6 hrs/d;
11. Plant design potable flowrate 23.3 MGD
Backwash or reject flow 0.75 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Unnamed tributary to Long Creek (Please see attached map)
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
1
Ammonia nitrogen / Chloramines Yes No X
Zinc -orthophosphate or sweetwater CP1236 Yes X No
List any other additives below:
Sodium hypochlorite, Sodium hydroxide, Fluoride, Sodium Bicarbonate,
Hexameta-phosphate, Ortho-phosphate
14. Is this facility located on Indian country? (check one)
Yes ❑
l m
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].
(Please see attached)
Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-I5:
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.
signature of Applicant Late
Page 3 of 4 Version 5/2012

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
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 Version 5/2012

TWO VERS
U T I L I T I E S
We are T R U to our customers!
June 18, 2018
Water Supply & Treatment Division
Sludge De -watering Facility
Sludge Management Plan
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wjwa .t.rori,��ts t�lie.�oE
The City of Gastonia —Two Rivers Utilities' Water Supply & Treatment Division's Sludge De -watering
Facility, NPDES #NC0040070, receives its total in -flow from the Water Treatment Plant. The majority
of this flow consists of effluent from filter backwashes, sedimentation basin clean -outs, ancillary
leakage from pipes and sample points, and drainage from in —line analytical equipment. Most of the
solids received at the plant are associated with the sedimentation basin clean -outs and are treated
with polymer to enhance settling when necessary.
Flow received by this plant is directed to one of two 0.6 million -gallon basins, where the solids are
allowed ample time to settle. The water is removed by decant pumps which are operated on a float -
ball system to insure that sludge is not inadvertently pumped to the discharge. Also, operational
personnel at the Water Treatment Plant monitor the turbidity of the discharge effluent while the
decant pumps are in operation. From March 2006 to present, the effluent has been discharged to
the Long Creek Wastewater Treatment Plant under City of Gastonia — Two Rivers Utilities
Wastewater Treatment Division SIU Permit #1064. Due to this fact, a request to place our NPDES
Permit in an "inactive" status was made to the NCDENR Division of Water Quality and approved in a
letter dated May 26, 2009. In January, 2018 the permit was reactivated due to critical equipment
failures at the facility. A request to deactivate the permit was requested and approved in May, 2018.
Presently, sludge is stored in basin #2 until it is filled. When readyto be moved, the sludge is analyzed
and is disposed of by an outside vendor who removes the sludge via a portable sludge pressing
operation that de -waters the sludge and transports the residuals to a permitted landfill.
This facility also has the capability to pump residuals directly to the City of Gastonia — Two Rivers
Utilities' Long Creek Wastewater Treatment Plant, if necessary.
C Edward Cross, Division Manager
Water Supply and Treatment Division
City of Gastonia —Two Rivers Utilitie
ti�

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,0ngitude:81°11'16" Gastonia WTP Location
�uad: Gastonia Nortb, N.C.
tream Class: C -- Am
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receiving Strea:UT Long Creek ®

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ROAD CLASSIFICATION
PRIMARY HIGHWAY LIGHT -DUTY ROAD, HARD OR
HARD SURFACE IMPROVED SURFACE
SECONDARY HIGHWAY
HARD SURFACE C::30EM= UNIMPROVED ROAD
Latitude 35-16'06". Longitude 81111'16"
Map # F14SW Sub -basin 030836
Stream Class WS-II
Discharge Class Water Treatment Plant -
I Receiving Stream UT to Long Creek/Catawba River I
I Design Q 1.2 MGQ
7
SCALE 1:24 000
0 1 MILE
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0
700 FEL;
0 1 KILOMETER
RUM
CONTOUR INTERVAL 20 FEET
QUAD LOCATION City of Gastonia
NCO040070
Gaston County
WTP

City of Gastonia — Two Rivers Utilities
Alum Sludge De -watering Facility
Line Diagram - (July 2014)
Basin #1
600,000 gals. ,
Polymer
addition
600,000 gals.
Sludge
Inventory
Alum Sludge
Facility
De -chlorination
Effluent
----------= ----- ► Collection
Box
Water Plant
To Long Creek
WWTP
'4 To discharge to
tributary to
Long Creek
Legend
► Influent
------► Effluent