NC0034703_Draft Fact Sheet_20240430

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO034703
Caroline Robinson / Compliance & Expedited Permitting Unit / caroline.robinsongdeq.nc. og_v / April 2024
FACILITY INFORMATION
Applicant/Facility Name
Rowan - Salisbury Schools (Jamie Durant, Chief Operations
Officer)
Knollwood Elementary School WWTP
Applicant Address/Mailing
Address
PO Box 2349, Salisbury, NC 28145
Facility Physical Address
3075 Shue Road, Salisbury NC 28147
Permitted Flow (MGD)
0.011 MGD
Type of Waste
100% Domestic, < 1 MGD
Facility Class
WW-2
County
Rowan
Permit Status
Renewal
Regional Office
MRO
STREAM CHARACTERISTICS
Receiving Stream
Little Creek
Stream
Classification
C
Stream Segment
12-110-3
Outfall Lat.
350 37' 29" N
7Q10 - Summer (cfs)
0.6
Outfall Long.
800 34' 22" W
7Q10 - Winter (cfs)
1.4
Drainage basin
Yadkin -Pee Dee River Basin
30Q2 (cfs)
1.8
Subbasin
03-07-04
Average Flow (cfs)
8
HUC
030401030101
IWC (%)
2.76% (summer) /
1.20% (winter)
303(d) List
No
BASIC INFO FOR EXPEDITED PERMIT RENEWAL
Does permit need Daily Max NH3 limits?
No — Already present in permit
Does permit need TRC limits/footnote?
No — Already present in permit
Does permit have toxicity testing?
No — not a complex wastestream
Does permit have any Special Conditions?
Yes, Nutrient Reopener for High Rock Lake
Does permit have instream monitoring?
No
New expiration date:
June 30, 2029
FACILITY SUMMARY
Rowan - Salisbury Schools operates a 100% domestic wastewater treatment plant for an estimated
population of 750 people. The Knollwood Elementary School WWTP is a minor facility (flow < 1 MGD)
with a design capacity and permitted wastewater discharge of 0.011 MGD. The original NPDES permit was
issued in September 1981. This facility utilizes the following treatment components:
• Grease trap
• Bar screen
• Equalization basin
• Aeration basin
• Clarifier
• Dosing tank
• Distribution box
• Surface sand filter
• Chlorine contact tank with tablet chlorinator and tablet de -chlorination
Fact Sheet for Permit Renewal
April 2024 - NPDES Permit NCO034703 - Page 1

• Ultrasonic flow meter
RENEWAL SUMMARY
This renewal contains the following changes:
• Updated eDMR language for electronic data submission in Part L A. (3).
COMPLIANCE HISTORY
Knollwood Elementary School WWTP has had one enforcement on record for a fecal coliform limit
violation in August 2022. The facility has been issued 18 NOVs for Fecal Coliform and Total Suspended
Solids limit violations and one proceed to enforcement case since the permit was originally issued in July
2019.
Most recent inspection (August 2022) showed the facility to be in compliance. On June 9, 2022, the
permittee requested to move the effluent sampling point out of manhole to a constructed sampling point.
The Division sent an approval letter dated June 24, 2022, to the permittee. Inspection of the new sampling
point was conducted August 4, 2022.
Fact Sheet for Permit Renewal
April 2024 - NPDES Permit NCO034703 - Page 2

IWC Calculations
Facility: Knollwood Elementary School WWTP
Permit No.: NC0034703
Prepared By : Caroline Robinson
Enter Design Flow (MGD): 0.011
Enter s7Q10 (cfs): 0.6
Enter w7Q10 (cfs): 1.4
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/1)
IWC (%)
Allowable Conc. (ug/1)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
Design
0.6
0.011
0.01705
17.0
0
2.76
615
Permitted
Design Permitted
200/100ml #VALUE!
36.19€ #VALUE!
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
<= Permitted Flow if Different from Design
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
s7Q10 (CFS)
0.6
DESIGN FLOW (MGD)
0.011
DESIGN FLOW (CFS)
0.01705
STREAM STD (MG/L)
1.0
Upstream Bkgd (mg/1)
0.22
IWC (%)
2.76
Allowable Conc. (mg/1)
28.4
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
w7Q10 (CFS)
1.4
DESIGN FLOW (MGD)
0.011
DESIGN FLOW (CFS)
0.01705
STREAM STD (MG/L)
1.8
Upstream Bkgd (mg/1)
0.22
IWC (%)
1.20
Allowable Conc. (mg/1)
131.5
*213 .0404 (c) Applies
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)

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