nc0039608_Fact Sheet_20210713

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
This form must be completed by Permit Writers for all expedited permits which do not require
full Fact Sheets. Expedited permits are generally simple 100% domestics (e.g., schools, mobile
home parks, etc.) that can be administratively renewed with minor changes but can include
facilities with more complex issues (Special Conditions, 303(d) listed water, toxicity testing,
instream monitoring, compliance concerns).
Basic Information for Ex edited Permit Renewals
Permit Writer/Date
Joe R. Corporon, PG / Jun2021
Permit Number
NC0039608
Owner
Sofield Children LTD Partnership
dba, Sofield Properties
Facility Name
Summit Woods I Apartments WWTP
WWTP Class
Grade IIBiologicalWPCS
Basin Name/Sub-basin number
New River / 05-07-01
Receiving Stream
Middle Fork of the South Fork New River
Stream Classification in Permit
WS-IV; Trout+
Stream Index: 10-1-2-(6)
Does permit need Daily Max NH3 limits?
No — already present
Does permit need TRC limits/language?
No — already present
Does permit have toxicity testing?
No
Does permit have Special Conditions?
No
Does permit have instream monitoring?
Yes, for DO and Temperature
Is the stream impaired (on 303(d) list)?
No
Any obvious compliance concerns?
None. Frequency violations only for TRC [no
action BPJ]. No enforcements during the
previous permit cycle.
Any permit mods since last permit?
No
New expiration date
31Mar2026
Changes to 2011 Permit?
Updated eDMR requirements
Updated regulatory citations
Changes to Draft Permit?
Commonly Used Expedited Language:
1. TRC Language for Compliance Level for Cover Letters/Effluent Sheet Footnote
"The Division shall consider compliant all effluent TRC values reported
below 50 µg/L. However, the Permittee shall continue to record and submit
all values reported by North Carolina certified -test methods (including field
certified), even if these values are reported below 50 µg/L."
Compliance History
Wens f Sits Comments History Inspections Indhents EMorcemearts Violations
SR. Guidelines Structures AfiliaGons Reviewers Related Permits ND Publish OuUall
Details 1 Details 2 Billing ClassJOesig. [• Events Rey. Activities
Permit 1C0039608 Status: In retiew
agave
Case Number
Tyre
Letter Sent Date
Penally Amount Paid
Case Closed
LV•2008.0432
Monitoring report has LimitVialations only
11124/2008
5210.00 S210.00
121231200E
LV-2442-9991
Monitoring report has Limit Violations only
0114442002
5323.00 $323.00
02+66/2042
LV-2002-0394
MonrtorIng report has LJmitVlotations only
09195i2002
$333.00 $333.09
10101;2002
LV-2002.02135
Monitarin9 wort has LimitVialations only
07119,2002
S333.64 $333.64
0E12712002

Summit Woods I Apartments WWTP is an existing extended -aeration wastewater
treatment system with a permitted flow of 0.0083 MGD (last inspected 15Nov2018).
Discharge flow averaged 0.0031 over the past permit cycle with a maximum discharge of
0.018 MGD and a minimum discharge of 0.0001 MGD. This 100% domestic facility
services — 24 homes utilizing the following components:
• aeration basin
• clarifier with sludge return
• effluent chlorination disinfection
• dechlorination
• flow meter
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
[Tentative] Permit Scheduled to Issue:
[Tentative] Effective date
If you have questions, email [[e-mail]]
Joe R. Crporon, P. i.,NPDESUnit. 21Jun2021
July 13, 2021
August 20, 2021
October 1, 2021

NPDES Implementation of Instream Dissolved Metals Standards — Freshwater
Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by
the NC Environmental Management Commission (EMC) on November 13, 2014. The
US EPA subsequently approved the WQS revisions on April 6, 2016, with some
exceptions. Therefore, metal limits in draft permits out to public notice after April 6,
2016 must be calculated to protect the new standards - as approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW,
µg/1
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW,
µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form.
Aquatic life standards for Mercury and selenium are still expressed as Total
Recoverable Metals due to bioaccumulative concerns (as are all human health
standards for all metals). It is still necessary to evaluate total recoverable aquatic
life and human health standards listed in 15A NCAC 2B.0200 (e.g., arsenic at 10
µg/1 for human health protection; cyanide at 5 µg/L and fluoride at 1.8 mg/L for
aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise
under 15A NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/1
Cadmium, Acute
WER* {1.136672-[lnhardness](0.041838)} •e^{0.9151 [In hardness]-3.1485}
Cadmium, Acute Trout wa ters
WER* {1.136672-[lnhardness](0.041838)} • e^ {0.9151[ln hardness]-3 .6236}
Cadmium, Chronic
WER* {1.101672-[lnhardness](0.041838)} •e^{0.7998[lnhardness]-4.4451}
Chromium III, Acute
WER* 0.316 •e^{0.8190[lnhardness]+3.7256}
Chromium III, Chronic
WER*0.860 • e^{0.8190[lnhardness]+0.6848}
Copper, Acute
WER* 0.960 • e^ {0.9422[ln hardness]-1.700 }
Copper, Chronic
WER* 0.960 • e^ {0.8545[ln hardness]-1.702 }

Lead, Acute
WER* {1.46203-[lnhardness](0.145712)} •e^{1.273[lnhardness]-1.460}
Lead, Chronic
WER* {1.46203 -[In hardness](0.145712)} • e^ { 1.273[ln hardness]-4.705}
Nickel, Acute
WER*0.998 • e^ {0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997•e^{0.8460[lnhardness]+0.0584}
Silver, Acute
WER*0.85 • e^ {1.72 [ln hardness]-6.59 }
Silver, Chronic
Not applicable
Zinc, Acute
WER* 0.978 • e^ {0.8473[ln hardness]+0.884}
Zinc, Chronic
WER* 0.986 • e^ {0.8473 [In hardness]+0.884}
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards.
However, application of the dissolved and hardness -dependent standards requires
additional consideration in order to establish the numeric standard for each metal of
concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream
(upstream) hardness and so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR
122.45(c). The discharge -specific standards must be converted to the equivalent total
values for use in the RPA calculations. We will generally rely on default translator values
developed for each metal (more on that below), but it is also possible to consider case -
specific translators developed in accordance with established methodology.
RPA Permitting Guidance/WQBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each
metal of concern, based on recent effluent data, and calculate the allowable effluent
concentrations, based on applicable standards and the critical low -flow values for the
receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or
acute), the discharge has reasonable potential to exceed the standard, which warrants a
permit limit in most cases. If monitoring for a particular pollutant indicates that the
pollutant is not present (i.e. consistently below detection level), then the Division may
remove the monitoring requirement in the reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit
Writer compiles the following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet
automatically calculates the 1 Q 10 using the formula 1 Q 10 = 0.843
(s7Q10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification

2. In order to establish the numeric standard for each hardness -dependent metal of
concern and for each individual discharge, the Permit Writer must first determine
what effluent and instream (upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test
results for any hardness data and contacts the Permittee to see if any additional
data is available for instream hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial
evaluation using a default hardness of 25 mg/L (CaCO3 or (Ca + Mg)).
Minimum and maximum limits on the hardness value used for water quality
calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal
showing reasonable potential, the permit writer contacts the Permittee and
requests 5 site -specific effluent and upstream hardness samples over a period of
one week. The RPA is rerun using the new data.
The overall hardness value used in the water quality calculations is calculated as
follows:
Combined Hardness (chronic)
= (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) x (s7Q 10, cfs *Avg. Upstream
Hardness, mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1 Q 10
flow.
3. The permit writer converts the numeric standard for each metal of concern to a
total recoverable metal, using the EPA Default Partition Coefficients (DPCs) or
site -specific translators, if any have been developed using federally approved
methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the
value for dissolved metal at laboratory conditions to total recoverable metal
at in -stream ambient conditions. This factor is calculated using the linear
partition coefficients found in The Metals Translator: Guidancefor
Calculating a Total Recoverable PermitLimitfrom a Dissolved Criterion
(EPA 823-B-96-007, June 1996) and the equation:
Cdiss =
Ctotal
1
1 + { [Kpo] [ss(1+a)] [10-6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L
used, and
Kpo and a = constants that express the equilibrium relationship between
dissolved and adsorbed forms of metals. A list of constants used for each
hardness -dependent metal can also be found in the RPA program under a

4. The numeric standard for each metal of concern is divided by the default partition
coefficient (or site -specific translator) to obtain a Total Recoverable Metal at
ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist
(ie. silver), the dissolved numeric standard for each metal of concern is divided by
the EPA conversion factor to obtain a Total Recoverable Metal at ambient
conditions. This method presumes that the metal is dissolved to the same extent as
it was during EPA's criteria development for metals. For more information on
conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total
allowable concentration (permit limits) for each pollutant using the following
equation:
Ca = (s7Q10 + Qw) (Cwqs) — (s7Q 10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3*
(µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q 10)
s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity
and human health through the consumption of water, fish, and shellfish from
noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background
concentrations
Flows other than s7Q 10 may be incorporated as applicable:
1 Q 10 = used in the equation to protect aquatic life from acute toxicity
QA = used in the equation to protect human health through the
consumption of water, fish, and shellfish from carcinogens
30Q2 =used in the equation to protect aesthetic quality
6. The permit writer enters the most recent 2-3 years of effluent data for each
pollutant of concern. Data entered must have been taken within four and one-half
years prior to the date of the permit application (40 CFR 122.21). The RPA
spreadsheet estimates the 95th percentile upper concentration of each pollutant.
The Predicted Max concentrations are compared to the Total allowable
concentrations to determine if a permit limit is necessary. If the predicted max
exceeds the acute or chronic Total allowable concentrations, the discharge is
considered to show reasonable potential to violate the water quality standard, and
a permit limit (Total allowable concentration) is included in the permit in
accordance with the U.S. EPA Technical Support Document for Water Quality -
Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules
in accordance with the EPA Headquarters Memo dated May 10, 2007 from James
Hanlon to Alexis Strauss on 40 CFR 122.47 Compliance Schedule Requirements.

8. The Total Chromium NC WQS was removed and replaced with trivalent
chromium and hexavalent chromium Water Quality Standards. As a cost savings
measure, total chromium data results may be used as a conservative surrogate in
cases where there are no analytical results based on chromium III or VI. In these
cases, the projected maximum concentration (95th %) for total chromium will be
compared against water quality standards for chromium III and chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the
discharge, are inserted into all permits with facilities monitoring for hardness -
dependent metals to ensure the accuracy of the permit limits and to build a more
robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this
permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness
(mg/L)
[Total as, CaCO3 or (Ca+Mg)]
—
Not Applicable
Average Upstream Hardness
(mg/L)
[Total as, CaCO3 or (Ca+Mg)]
—
Not Applicable
7Q10 summer (cfs)
0.0
BIMS
1 Q 10 (cfs)
—
Not Applicable
Permitted Flow (MGD)
0.0031
Max monthly average in
previous 40 months

ROY COOPER
Governor
DIONNE DELLI-GATTI
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
April 13, 2021
Sofield's Children LTD partnership DBA Sofield Properties
Attn: Heather Sofield, Manager
355 Industrial Park Dr
Boone, NC 28607
Subject: Permit Renewal
Application No. NC0039608
Summit Woods Apartments WWTP
Watauga County
Dear Applicant:
The Water Quality Permitting Section acknowledges the April 12, 2021 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 150B-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deq. nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
ec: WQPS Laserfiche File w/application
Sincerely,
ct
Wren The •rd
Administrative Assistant
Water Quality Permitting Section
North Carolina Department of Environmental Quality I Division of Water Resources
Winston-Salem Regional Office 14S0 West Hanes A911 Road, Suite 300 I Winston-Salem North Carolina 27105
336..77 9800

NPDES APPLICATION - FORM D
For privately -owned treatment systems treating 100% domestic wastewaters <1.0 MGD
Mail the complete application to:
N. C. DENR / Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit
NC0039608
If you are completing this form in computer use the TAB key or the up - down arrows to move front one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
Sofield Children LTD Parternship dba Sofield Properties
Summit Woods I Apartments WWTP
355 Industrial Park Dr
Boone
NC 28607
[phone]
( )
2. Location of facility producing discharge:
Check here if same address as above ❑
Street Address or State Road 237 Bloomfield Drive
City Blowing Rock
State / Zip Code NC 28605
County Watauga
3. Operator Information:
Name of the firm, public organization or other entity that operates the facility. (Note that this is not
referring to the Operator in Responsible Charge or ORC)
Name Water Quality Lab and Operations
Mailing Address P.O. Box 1167
City Banner Elk
State / Zip Code NC 28604
Telephone Number [phone]
Fax Number [phone]
e-mail Address [e-mail]
1 013 Form-D 11/12

NPDES APPLICATION - FORM D
For privately -owned treatment systems treating 100% domestic wastewaters <1.0 MGD
4. Description of wastewater:
Facility Generating Wastewater(check all that apply):
Industrial
Commercial
Residential
School
Other
Number of Employees
Number of Employees
Number of Homes
Number of Students/ Staff
Explain:
24
Describe the source(s) of wastewater (example: subdivision, mobile home park, shopping centers,
restaurants, etc.):
Apartment building
Number of persons served: apx. 31
5. Type of collection system
Separate (sanitary sewer only) ❑ Combined (storm sewer and sanitary sewer)
6. Outfall Information:
Number of separate discharge points 1
Outfall Identification number(s) 001
Is the outfall equipped with a diffuser? ❑ Yes /ZI No
7. Name of receiving stream(s) (NEW applicants: Provide a map showing the exact location of each
outfall):
Unnamed tributary to the Middle Fork of the new River, classified as WS-IV Trout waters in hydi
unit 05050001 of the New River Basin
8. Frequency of Discharge: ® Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: Duration:
9. Describe the treatment system
List all installed components, including capacities, provide design removal for BOD, TSS, nitrogen and
phosphorus. If the space provided is not sufficient, attach the description of the treatment system in a
separate sheet of paper.
Aeration basin, clarifier with sludge return, effluent disinfection, dechlorination, flow
meter
2 of 3 _ Form-D 11/12

NPDES APPLICATION - FORM D
For privately -owned treatment systems treating 100% domestic wastewaters <1.0 MGD
10. Flow Information:
Treatment Plant Design flow .0083 MGD
Annual Average daily flow .0027 MGD (for the previous 3 years)
Maximum daily flow .011 MGD (for the previous 3 years)
11. Is this facility located on Indian country?
❑ Yes ® No
12. Effluent Data
NEW APPLICANTS: Provide data for the parameters listed. Fecal Coliform, Temperature and pH shall be grab
samples, for all other parameters 24-hour composite sampling shall be used. If more than one analysis is reported,
report daily maximum and monthly average. If only one analysis is reported, report as daily maximum.
RENEWAL APPLICANTS: Provide the highest single reading (Daily Maximum) and Monthly Average
over the past 36 months for parameters currentl in our permit. Mark other parameters "N/A".
Parameter
Daily
Maximum
Monthly
Average
Units of
Measurement
Biochemical Oxygen Demand (BOD5)
16.7
6.08
mg/L
Fecal Coliform
200
4.94
cuf/100mL
Total Suspended Solids
24
13.2
mg/L
Temperature (Summer)
23
19.11
Degrees Celsius
Temperature (Winter)
20
13
Degrees Celsius
pH
7.9
7.35
S/u
13. List all permits, construction approvals and/or applications:
Type
Permit Number Type
Hazardous Waste (RCRA) NESHAPS (CAA)
UIC (SDWA) Ocean Dumping (MPRSA)
NPDES NC0039608 Dredge or fill (Section 404 or CWA)
PSD (CAA) Other
Non -attainment program (CAA)
14. APPLICANT CERTIFICATION
Permit Number
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information\is true, complete, and accurate.
Heather Jones System Owner
04-06-2O2l
Signature of Appli• nt Date
North Carolina General Statute 143-215.6 (b)(2) states: Any person who knowingly makes any false statement representation, or certification in any
application, record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management
Commission implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method
required to be operated or maintained under Article 21 or regulations of the Environmental Management Commission implementing that Article, shall be
guilty of a misdemeanor punishable by a fine not to exceed $25,000, or by Imprisonment not to exceed six months, or by both. (18 U.S.C. Section 1001
provides a punishment by a fine of not more Than $25,000 or imprisonment not more than 5 years, or both, for a similar offense.)
3 of 3
Form-D 11/12