NC0032212_Fact Sheet_20230613

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO032212
Catherine Shadwell, Compliance & Expedited Permitting Unit / 919-707-3613 June 2023
FACILITY INFORMATION
Facility Name
Yonahlossee WWTP
Applicant Name
Water Quality Lab and Operations, Inc (Paul Isenour)
Applicant Address
PO Box 1167 Banner Elk, NC 28604
Facility Physical
Address/Mailing Address
NCSR 1102, South of Boone
Permitted Flow (MGD)
0.04 MGD
Type of Waste
100% Domestic, < 1 MGD
Facility Class
WW-2
County
Watauga
Permit Status
Renewal
Regional Office
WSRO
STREAM CHARACTERISTICS
Receiving Stream
Lance Creek
Stream
Classification
C; Tr
Stream Segment
8-8-(2)
Outfall Lat.
360 10' 12" N
7Q 10 - Summer (cfs)
0.13
Outfall Long.
810 43' 21" W
7Q 10 - Winter (cfs)
0.17
Drainage basin
Watauga
30Q2 (cfs)
0.3
Subbasin
04-02-01
Average Flow (cfs)
1.3
HUC
060101030301
IWC (%)
Summer: 32.29%
Winter: 26.72%
303(d) List
Not listed.
Facility Summary
Water Quality Lab and Operations, Inc. operates a private 100% domestic wastewater plant called
Yonahlossee WWTP. This WWTP services about 189 residents. It is a minor facility with a current design
capacity of 0.04 MGD, but this facility also has modification on file for an expansion that has not yet
happened, this mod would change design flow to 0.15 MGD. The permit for this site was originally issued
in 1977. This facility utilizes the following treatment components.
• Aeration flow equalization basin
• Three-way splitter box
• Aeration basin
• Clarifier
• Aerated sludge holding tank
• Disinfection / post -aeration chamber with UV disinfection
• Continuous flow -recording device
Fact Sheet for Permit Renewal
June 2023 - NPDES Permit NCO032212 - Page 1

Renewal Summary
This renewal contains the following changes:
• Added the facility grade to Section A. (1.) and A. (2.)
• Updated the effluent table in Section A. (1.) with eDMR parameter codes.
• Updated Section A. (4.) to reflect current federal requirements for Electronic Reporting of
Discharge Monitoring Reports.
• Added HUC and Stream Index to Outfall Map
• Moved limit comments on pH and DO from footnotes to the tables in section A.(1.) and A.(2.)
Compliance History
Most recent NOV was in 2019 for UV system being down and site had no chart recorder.
Comments on Draft Permit
Added effluent monitoring for turbidity to determine compliance with 15A NCAC 02B.0211 (21) in
tables in sections A.(1.) and A.(2.).
Fact Sheet for Permit Renewal
June 2023 - NPDES Permit NC0032212 - Page 2

IWC Calculations
Facility: Yonahlossee WWTP
Permit No.: NC0032212
Prepared By: Catherine Shadwell
Enter Design Flow (MGD): 0.15
Enter s7Q10 (cfs): 0.13
Enter w7Q10 (cfs): 0.17
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
Design
Permitted
Design
Permitted
s7Q10 (CFS)
0.13
0.13
s7Q10 (CFS)
0.13
0.13
DESIGN FLOW (MGD)
0.15
0.2
DESIGN FLOW (MGD)
0.15 €
0.2
DESIGN FLOW (CFS)
0.2325
0.31
DESIGN FLOW (CFS)
0.2325
0.31
STREAM STD (UG/L)
17.0
17
STREAM STD (MG/L)
1.0
1
Upstream Bkgd (ug/1)
0
0
Upstream Bkgd (mg/1)
0.22
0.22
IWC (%)
64.14
70.45
IWC (%)
64.14
70.454545
Allowable Conc. (ug/1)
27
24
Allowable Conc. (mg/1)
1.4
1.3
< 1 MGD Policy Applies
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Design
Permitted
Design
Permitted
Fecal Coliform
w7Q10 (CFS)
0.17
0.17
Monthly Average Limit:
200/100m1 €
200/100m1
DESIGN FLOW (MGD)
0.15
0.2
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.2325
0.31
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
1.8
Dilution Factor (DF)
1.56
1.42
Upstream Bkgd (mg/1)
0.22
0.22
IWC (%)
57.76
64.58
Allowable Conc. (mg/1)
3.0
2.7
*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)

IWC Calculations
Facility: Yonahlossee WWTP
Permit No.: NC0032212
Prepared By: Catherine Shadwell
Enter Design Flow (MGD): 0.04
Enter s7Q10 (cfs): 0.13
Enter w7Q10 (cfs): 0.17
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
Design
Permitted
s7Q10 (CFS) 0.13 0.13
s7Q10 (CFS)
0.13
0.13
DESIGN FLOW (MGD) 0.04 0.2
DESIGN FLOW (MGD)
0.04 €
0.2
DESIGN FLOW (CFS) 0.062 0.31
DESIGN FLOW (CFS)
0.062
0.31
STREAM STD (UG/L) 17.0 17
STREAM STD (MG/L)
1.0
1
Upstream Bkgd (ug/1) 0 0
Upstream Bkgd (mg/1)
0.22
0.22
IWC (%) 32.29 70.45
IWC (%)
32.29
70.454545
Allowable Conc. (ug/1) 53 24
Allowable Conc. (mg/1)
2.6
1.3
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
Design
Permitted
Fecal Coliform
w7Q10 (CFS)
0.17
0.17
Monthly Average Limit: 200/100m1 € 200/100m1
DESIGN FLOW (MGD)
0.04
0.2
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.062
0.31
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
1.8
Dilution Factor (DF) 3.10 1.42
Upstream Bkgd (mg/1)
0.22
0.22
IWC (%)
26.72
64.58
Allowable Conc. (mg/1)
6.1
2.7
*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)