NC0086959_Fact Sheet_20180606

DENR/DWR
FACT SHEET FOR NPDES PERMIT RENEWAL
NPDES Permit NCO086959
Facility Information
Applicant/Facility Northwestern Wayne Sanitary District Water Treatment Plant (WTP) No. 2
Name:
Applicant Address: P.O. Box 1583, Goldsboro, North Carolina 27533-1583
Facility Address: 2165 Memorial Church Drive, Kenl , North Carolina 27542
Permitted Flow Not limited[design ca aci 0.900 MGD
Tyne of Waste: Greensand filter backwash L-ypically recycled 0.066 Ave; to max 0.132 MGD).
Facili /Permit Status: Renewal
Facility Classification PC -1
County: Wayne
Miscellaneous
Receiving Stream:
UT to Great Swamp,
Neuse River Basin
Regional Office:
Washington
Stream Classification:
C; SW; NSW
State Grid:
E26 SE
USGS Topo Quad:
Kenly East
303(d) Listed?
Not Listed
(2016 Approved list)
Permit Writer:
Joe R. Corporon, L.G.
Subbasin:
03-04-07
Date:
06Jun2018
HUC
03020203
Facility Location
Aa"r
(Not to Scale)
Drainage Area (mi2):
N/A
Summer 7Q 10 (cfs)
N/A
Winter 7Q10 (cfs):
N/A
30Q2 (cfs)
N/A
Average Flow (cfs):
N/A
IWC (%):
100
Primary SIC Code:
4941
FACILITY SUMMARY
Northwest Wayne Sanitary District's WTP No. 2 applies greensand filter technology to well water
removing iron and manganese. The facility is designed to produce 0.900 MGD of potable water and an
estimated design backwash flow range of 0.066 Ave; to max 0.132 MGD. The facility operates as 100%
recycle but is permitted to discharge treated backwash to an Unnamed Tributary to Great Swamp, Neuse
River Basin. However, backwash wastewater has been recycled and retreatediblended with potable water
with no discharge during the previous two permit cycles, except for two (2) each, two-day
discharge events in August 2017.
Water and wastewater treatment facilities [greensand] and chemical additives consists of:
• five (5) each groundwater pumping wells
• one (1) aeration tower
• one (1) raw water storage reservoir
• three (3) each greensand filters (with Potassium Permanganate regeneration)
• additional treatment applied as
o gaseous chlorination
o ammonia addition
o sodium fluoride addition
• one (1) holding tank for wastewater backwash (conditioned, as needed by)
o aluminum sulfate (flocculation), or
o calcium thiosulfate (dechlorination)

After holding -tank treatment, the Permittee typically recycles backwash supernate to the
headworks for further treatment and blending, thereby allowing for a 100% -closed wastewater
treatment system; but upon occasion as warranted, is permitted to discharge to surface waters.
PERMITTING STRATEGY
Changes for Renewal: Renewal followed permitting guidance for Greensand Water Treatment Plants
and Neuse River Basin Nutrient Requirements If the facility choses to discharge, each discharge must be
monitored. Previous Table 2 is hereby combined with Table 1 to include all monitoring for radioactivity
in the effluent. Monitoring and limits are required in accordance with 15A NCAC 2B .0200.
Whole Effluent Toxicity Testing
Toxicity testing is not required by the current permitting strategy for greensand filtration WTPs; no
changes recommended for the renewal.
Data Review and Reasonable Potential Analyses (RPA): The facility has not discharged since prior to
2008, therefore RPA was not conducted. All filter backwash water is collected in a storage tank and
treated, with alum to help with flocculation, and calcium thiosulfate for dechlorination as needed.
Treated decant is typically recycled back to the WTP treatment process. Potable water is used to
backwash the filters. If needed, the decanted wastewater can be directed to the NPDES outfall. The
Permittee wants to retain the permit for potential future discharges.
Residuals collected in the wastewater settling tank are radioactive and must be disposed in a hazardous
waste landfill in accordance with limits for conditional release of sludge waste generated by water
treatment facilities [15A NCAC 11 .1653]. Drinking water passes all PWS testing requirements.
Summary of Chan es to the Permit
Considering a routinely infrequent episodic discharge regimen (100% recycle of filter
backwash), all monitoring frequencies are hereby revised to "Each Discharge."
• Zn is required of greensand (no data to date); therefore, added Zn (monitoring only).
At last renewal, ownership changed back to Northwestern Wayne Sanitary District, from
Northwestern/Belfast - Patetown Sanitary District, therefore a BIMS update is recommended.
• The facility description has been updated (see Supplement to Permit Cover Sheet).
• The Site -Vicinity Map has been updated.
• Total Hardness monitoring (effluent and upstream] is required in support of EPA's calculation
for metals in dissolved fraction. Therefore, instream sample is hereby reintroduced to the permit.
Zero -flow conditions mandate revising upstream to "instream" [Inst = instream], this sampling
location specified a minimum 100 feet from the outfall.
BASIS FOR LIMITS:
• Due to a discharge under zero -flow conditions [30Q2 and & 7Q10 = 0.0 cfs] all limits are based
on surface water quality standards [15A NCAC 2B .0200].
• Radiological Component limits in the permit are based on North Carolina water quality standards
[15A NCAC 2B .0200] and EPA Federal Criteria.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: 13Jun2018
Permit Scheduled to Issue: O1AUg2018 (est.)
STATE CONTAGT:
If you have arty ques ons o ny the above information or on the attached permit, please contact Joe
Corporon at (919) 7- 4, o� )[e-mail].
J
NAME:
� DATE:

Four (4) days of discharge
NC0086959
Northwestern I Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
4
2017
50050 - Flow, in conduit or thru treatment plant
mgd
0.0125
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
5
2017
50050 - Flow, in conduit or thru treatment plant
mgd
0.0025
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
8
2017
00070 - Turbidity
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
8
2017
00400 - pH
ntu
26
NG0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
8
2017
50050 - Flow, in conduit or thni treatment plant
su
mgd
6.9
0.039
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
8
2017
50060 - Chlorine, Total Residual
ugA
11
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
8
2017
CO530 - Solids, Total Suspended - Concentration
mg/I
3.3
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
00070 - Turbidity
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
00400 - pH
ntu
3.7
NC0086959
Northwestern / Belfast-Patetown Sanitary District- Memorial Church Road WTP #2
8
9
2017
00951 - Fluoride, Total (as F)
su
mg/I
6.82
0.23
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
01045 - Iron, Total (as Fe)
mg/I
0.466
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
01055 - Manganese, Total (as Mn)
ug/I
3094
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
01105 - Aluminum, Total (as Al)
ug/I
198
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
03520 - Radiation,gross beta
uc/ml
8.23
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
11503 - Radium 226 + radium 228, total
pci/I
0.785
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
13501 - Strontium 90, total
pcVl
-0.604
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
22708 - Uranium, Natural, Total
ugA
0.08
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
50050 - Flow, in conduit or thru treatment plant
mgd
0.039
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
50060 - Chlorine, Total Residual
ug/I
16
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
82077 - Radiation, gross alpha
pcvl
2.15
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
82126 - Tritium, total
pcvl
191
NC0086959
Northwestern I Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
CO530 - Solids, Total Suspended - Concentration
mg/I
6.5
NC0086959
Northwestern I Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
CO600 - Nitrogen, Total - Concentration
mg/I
1.57
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
CO610 - Nitrogen, Ammonia Total (as N) - Concentratior
mg/l
0.78
NC0086959
Northwestern / Belfast-Patetown Sanitary District - Memorial Church Road WTP #2
8
9
2017
CO665 - Phosphorus, Total (as P) - Concentration
mg/I
0.1
Permit
Facility
Month
Day
Year
Parameter
UoM
Value Modifier

Arial Photo of
NPDES Permit NCO086959
Northwestern Wayne Sanitary District
Memorial Church Road Water Treatment Plant (WTP) No. 2
2165 Memorial Church Road, Kenly
Wayne County
• Closed -Loop / 100% -recycle treatment system
• Intermittent/episodic discharge, as warranted, flows NE to Great Swamp.
• See blowup

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