NC0033448_Draft Factsheet_20230530

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO033448
Catherine Shadwell Compliance & Expedited Permitting Unit / 919-707-3613 May 2023
FACILITY INFORMATION
Owner/Facility Name
MS & SR Enterprises LLC
Valley Creek Apartments WWTP
Applicant Name
Water Quality and Operations, Inc (Paul Isenhour)
Applicant Address
P.O Box 1167, Banner Elk, NC 28604
Facility Physical
Address/Mailing Address
Mailing — 104 Helen Court, Boone, NC 28607
Physical — 10894 NC Highway 105 S, Boone, NC 28607
Permitted Flow (MGD)
0.005 MGD
Type of Waste
100% Domestic, < 1 MGD
Facility Class
WW-2
County
Watauga
Permit Status
Renewal
Regional Office
WSRO
STREAM CHARACTERISTICS
Receiving Stream
Valley Creek
Stream
Classification
C; Tr
Stream Index
8-4
Outfall Lat.
360 08' 40" N
7Q 10 - Summer (cfs)
0.3
Outfall Long.
810 48' 02" W
7Q10 - Winter (cfs)
0.36
Drainage basin
Watauga
30Q2 (cfs)
0.73
Subbasin
04-02-01
Average Flow (cfs)
2.9
HUC
060101030301
IWC (%)
Summer — 2.52%
Winter — 2.11%
303(d) List
Not listed.
Facility Summary
Valley Creek Apartments are a small residential apartment housing about 20 residents. It has a private
closed system that feeds into the onsite Valley Creek WWTP. This is a minor facility (flow < 1 MGD) with
a permitted wastewater discharge of 0.005 MGD. The permit for this facility was originally issued in March
of 1982.
• aeration basin
• clarifier
• sludge -holding basin
• chlorination / chlorine -contact chamber
• dechlorination
Renewal Summary
This renewal contains the following changes:
• Updated A (2) Electronic Reporting to reflect most updated language and added facility grade.
• Updated Map HUC code to 12 code in order to be the most accurate.
• Facility grade updated to WW2 in 2018, monitoring frequencies have been updated to reflect
change.
• Added effluent monitoring for turbidity to determine compliance with 15A NCAC 02B.0211 (21).
• Added effluent monitoring for dissolved oxygen to determine compliance with 15A NCAC
02B.0211 (6).
• Added instream monitoring for temperature to determine compliance with 15A NCAC 02B.0211
(18).
Fact Sheet for Permit Renewal
May 2023 - NPDES Permit NCO033448 - Page 1

Compliance History
Notes from WSRO — There were a couple of issues here. The drive unit is OOS with no back
up. The ORC is hand cranking the unit. Additionally, there was exposed PVC pipes. I check in
frequently on this facility. If I get any more, I'll pass along to permit writer. Upgrades are being
done, and I will keep reaching out for updates.
No recorded enforcements in the last 5 years, and most recent NOV was in 2014 for Coliform.
Comments on Draft Permit
Minor grammar and format edits
No significant comments on draft
Fact Sheet for Permit Renewal
May 2023 - NPDES Permit NCO033448 - Page 2

IWC Calculations
Facility: Valley Creek Apartments WWTP
Permit No.: NC0033448
Prepared By: Catherine Shadwell
Enter Design Flow (MGD): 0.005 0.2 <=
Permitted Flow if Different from Design
Enter s7Q10 (cfs): 0.3
Enter w7Q10 (cfs): 0.36
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
Design
Permitted
s7Q10 (CFS) 0.3 0.3
s7Q10 (CFS)
0.3 €
0.3
DESIGN FLOW (MGD) 0.005 € 0.2
DESIGN FLOW (MGD)
0.005 €
0.2
DESIGN FLOW (CFS) 0.00775 0.31
DESIGN FLOW (CFS)
0.00775
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 (%) 2.52 € 50.82
IWC (%)
2.52 €
50.819672
Allowable Conc. (ug/1) 675 33
Allowable Conc. (mg/1)
31.2
1.8
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Design Permitted
Design
Permitted
Fecal Coliform
w7Q10 (CFS)
0.36 €
0.36
Monthly Average Limit: 200/100m1 200/100ml
DESIGN FLOW (MGD)
0.005
0.2
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.00775
0.31
(If DF<331; Limit)
STREAM STD (MG/L)
1.8 E
1.8
Dilution Factor (DF) 39.71 1.97
Upstream Bkgd (mg/1)
0.22
0.22
IWC (%)
2.11
46.27
Allowable Conc. (mg/1)
75.2
3.6
'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)