NC0083941_Fact Sheet_20240416

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO083941
Catherine Shadwell, Compliance & Expedited Permitting Unit / 919-707-3613 March 2024
FACILITY INFORMATION
Applicant/Facility Name
Aqua North Carolina, Inc. (Lauren Raup-Plummer)
Spring Creek WWTP
Applicant Mailing Address
202 MacKenan Court Cary NC 27511
Facility Physical Address
Central Rd Clemmons NC 27012
Permitted Flow (MGD)
0.08 MGD
Type of Waste
100% Domestic, < 1 MGD
Facility Class
WW-2
County
vidson
Permit Status
Renewal
Regional Office+Da
SRO
STREAM CHARACTERISTICS
Receiving Stream
Fryes Creek
Stream
Classification
C
Stream Segment
12-94-15
Outfall Lat.
350 58' 37" N
7Q10 - Summer (cfs)
0.64
Outfall Long.
800 18' 10.1" W
7Q10 - Winter (cfs)
1.59
Drainage basin
Yadkin -Pee Dee
30Q2 (cfs)
2.03
Subbasin
03-07-04
Average Flow (cfs)
8.93
HUC
030401011308
IWC (%)
16.23% (summer) /
7.23% (winter)
303(d) List
Not listed.
BASIC INFO FOR EXPEDITED PERMIT RENEWAL
Does permit need Daily Max NH3 limits?
Already present in permit
Does permit need TRC limits/footnote?
Already present in permit
(Does permit have toxicity testing?
No
Does permit have any Special Conditions?
Yes, nutrient reopener for high rock lake.
Does permit have instream monitoring?
No
New expiration date:
May 31, 2029
Facility Summary
Aqua North Carolina, Inc. Operates a small wastewater treatment plant for Spring Creek Subdivision.
Spring Creek WWTP treats 100% domestic wastewater. This facility is a minor facility (flow < 1 MGD)
with a design capacity and permitted wastewater discharge of 0.08 MGD. The WWTP was originally
permitted in 1994. This facility utilizes the following treatment components:
• Bar screen
• Flow equalization basins
• Dual aeration basins
• Dual Secondary clarifiers
• UV Disinfection
• Back up chlorination and de -chlorination
• Single aerated sludge digesters
• Effluent flow meter and weir
• Emergency generator
• Post aeration
Fact Sheet for Permit Renewal
April 2024 - NPDES Permit NCO083941 - Page 1

Renewal Summary
This renewal contains the following changes:
• Updated Section A. (3.) to reflect current federal requirements for Electronic Reporting of
Discharge Monitoring Reports.
• Updated Outfall map
• Added new winter ammonia nitrogen limits to be in compliance with 2B .0404(c) - Winter Limits
can be no less stringent than 2 times the summer limits. New limits will go into effect January 1,
2029.
Compliance History
In the past 5 years, this facility has received 1 NOV in 2024 for violations detected during a compliance
inspection. Inspection found that facility was monitoring flow rates at a constant rate instead of permitted
requirement of composite sampling.
Comments on Draft Permit
Fact Sheet for Permit Renewal
April 2024 - NPDES Permit NC0083941 - Page 2

IWC Calculations
Facility:Spring Creek WWTP
Permit No.: NC0083941
Prepared By: Catherine Shadwell
Enter Design Flow (MGD): 0.08 <= Permitted Flow if Different from Design
Enter s7Q10 (cfs): 0.64
Enter w7Q10 (cfs): 1.59
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
Design Permitted
s7Q10 (CFS)
0.64
s7Q10 (CFS)
0.64
DESIGN FLOW (MGD)
0.08
DESIGN FLOW (MGD)
0.08 €
DESIGN FLOW (CFS)
0.124
DESIGN FLOW (CFS)
0.124
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
16.23
IWC (%)
16.23
Allowable Conc. (ug/1)
105
Allowable Conc. (mg/1)
5.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
Design Permitted
Fecal Coliform
w7Q10 (CFS)
1.59
Monthly Average Limit:
200/100mi € #VALUE!
DESIGN FLOW (MGD)
0.08
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.124
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
6.16 #VALUE!
Upstream Bkgd (mg/1)
0.22
IWC (%)
7.23
Allowable Conc. (mg/1)
22.1
*2B .0404 (c) Applies
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
By Policy dischargers < 1 MGD get limits no lower than 2 & 4 due to BAT
* From 2B .0404(c) - Winter Limits can be no less stringent than 2 times the summer limits
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)