NC0076082_Fact Sheet_20210519

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NCDEQ
FACT SHEET FOR RENEWAL
NPDES PERMIT NC0076082
Facility Information
Applicant/Facility Name:
Biltmore Investments, LTD / Bear Wallow Valley MHP WWTP
Applicant Address:
PO Box 745, Hendersonville, NC 28739
Facility Address:
1975 Bear Wallow Road, Hendersonville, NC 28739
Permitted Flow
0.010 MGD
Type of Waste:
Domestic
Facility/Permit Status:
Class II /Active; Renewal
County:
Henderson County
Miscellaneous
Receiving Stream:
Stream Classification:
303(d) Listed?
Subbasin:
Drainage Area (mi2):
s7Q10 (cfs)
w7Q10 (cfs)
Average Flow (cfs):
IWC (%):
UT to Clear Creek Regional Office:
B; Trout
State Grid /
USGS Quad:
Asheville (ARO)
F9NE / Bat Cave, NC
No
Permit Writer:
Joe R. Corporon, P.G.
04-03-02
Date:
19May2021
0.45
0.13
0.19
0.76
11%
Lat. 35° 24' 50" N Long. 82° 21' 35" W
BACKGROUND
Biltmore Investments, LTD has requested renewal of NPDES permit NC0076082 for the Bear Wallow
Valley Mobile Home Park (MHP) WWTP. The treatment system design flow is 0.010 MGD.
This permit was originally issued in 1989. During permit cycle 2006-2010 the Permittee added an EQ
basin, pumps, splitter box and electrical controls in accord with DWQ's Authorization to Construct
(ATC) executed on April 4, 2007. This permit was last renewed in 2016.
RECEIVING STREAM INFORMATION
The WWTP discharges to an Unnamed Tributary to Clear Creek, classified B-Trout within the French
Broad River Basin. The facility treats 100 % domestic waste only - no industrial dischargers. Although
this particular segment of Clear Creek is not impaired, both an upstream segment and a downstream
segment are impaired for biological integrity with a possible source, assumed impacted by agricultural
activities.
INSPECTION / CORRESPONDENCE
ARO has yet to provide a staff Report to the Central Office for this renewal, however Janet Cantwell
(ARO) last reported [28Feb2018] this facility appeared "very well operated and maintained."
PERMIT LIMIT COMPLIANCE
In April 2020 Biltmore received monitoring frequency violation for Ammonia Nitrogen. The facility
received no enforcement actions for the period Jan2018 thru May2021.
Fact Sheet
NPDES NC0076082—Renewal May2021
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INSTREAM MONITORING:
Not required [IWC = 11%] - no changes recommended.
DMR DATA SUMMARY (JAN2018-MAY2021)
Conventional Parameters Summarized Below:
Effluent Characteristics
Minimum
Average
Maximum
Sample Count
Flow (MGD)
0.002
0.0059
0.012
1153
BOD, 5-day, 20° C (mg/1)
2
3.97
19
170
Total Suspended Solids (mg/1)
2.5
5.34
20
170
Fecal Coliform (per 100 ml)
1
1.62
76
170
Total Residual Chlorine (µg/1)
< 20
23.32
28
342
Temperature ° C
4°
15.7
28
171
pH (standard units)
6.2
6.98
7.3
171
SUMMARY OF PROPOSED CHANGES
• Updated permit format
• Included eDMR requirements and application instructions
• Updated site map
PROPOSED SCHEDULE OF ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
May 25, 2021 (est.)
July 11, 2021 (est.)
NPDES DIVISION CONTACT
If you have questions on any of the above information or on the attached permit, please email Joe R.
Corporon, P.G. [[e-mail]].
NAME:
DATE: 19MAY2021
NPDESinplementa on 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.
Fact Sheet
NPDES NC0076082—Renewal May2021
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Table 5. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, 14/1
(Dissolved)
Chronic FW,
µg/1
(Dissolved)
Acute SW, 14/1
(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-[ln hardness](0.041838)} • e^{0.9151 [ln
hardness]-3.1485 }
Cadmium, Acute Trout
waters
WER* {1.136672-[ln hardness](0.041838)} • e^{0.9151[ln
hardness]-3 .6236 }
Cadmium, Chronic
WER*{1.101672-[ln hardness](0.041838)} • e^{0.7998[ln
hardness]-4.4451 }
Chromium III, Acute
WER*0.316 • e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 • e^{0.8190[In hardness]+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-Pi hardness](0.145712)} • e^{1.273[lnhardness]-
1.460 }
Fact Sheet
NPDES NC0076082-Renewal May2021
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Lead, Chronic
WER*{1.46203-[lnhardness](0.145712)} • e^{1.273[lnhardness]-
4.705 }
Nickel, Acute
WER*0.998 • e^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 • e^{0.8460[In hardness]+0.05 84 }
Silver, Acute
WER*0.85 • e^{1.72[ln hardness]-6.59}
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 • e^{0.8473[In hardness]+0.884}
Zinc, Chronic
WER*0.98 6 • 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 1Q10 using the formula 1Q10 = 0.843 (s7Q10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
Fact Sheet
NPDES NC0076082—Renewal May2021
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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 (s7Q10, 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: Guidance for
Calculating a Total Recoverable Permit Limit from 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.
Fact Sheet
NPDES NC0076082—Renewal May2021
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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 = (s7Q 10 + 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 exceptNH3* (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 s7Q10 maybe 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.
Fact Sheet
NPDES NC0076082—Renewal May2021
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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)]
N/A
No RPA necessary
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
N/A
No RPA necessary
7Q10 summer (cfs)
N/A
No RPA necessary
1 Q 10 (cfs)
N/A
No RPA necessary
Permitted Flow (MGD)
N/A
No RPA necessary
Fact Sheet
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ROYCOOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director,
Biltmore Investments, LTD
Attn: Nicholas Stefanou,
104 Low Gap Road
Hendersonville, NC 28739
Subject: Permit Renewal
Application No. NC0076082,
Bear Wallow Valley MHP WWTP
Henderson. County
NORTH CAROLINA
Environmental Quality
May 11, 2020
Dear Applicant:
The Water Quality Permitting Section acknowledges the May 11, 2020 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 currentpermit 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/perniits-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..
Sincerely,
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
cc: Kevin C. White-Whitewater Envir., LLC
ec: WQPS Laserfiche File w/application
North Ca ro9ina Department of Enviromrnemtal Quality 1 ,,Divisom of Water Resocsrces
Ashev to Regonal gf ce 12060'U.S. 74 }I ghavay I Swannarsoa, Noitfo. Ciro Tara 28778 . .
828�°845D0

DocuSign Envelope ID: E4A31513-705C-4491-814E-1280C736224A
NPDES APPLICATION - FORM D
For privately -owned treatment systems treating 100°l0 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
INC0076082
If you are completing this form in computer use the TAB key or the up - down arrows to move from 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
Biltmore Investments, LTD.
Bear Wallow Valley Mobile Home Park
P.O. Box 745
Hendersonville
N.C. 28739
[phone]
[phone]
wmcgee [e-mail]
2. Location of facility producing discharge:
Check here if same address as above ❑
Street Address or State Road 1975 Bear Wallow Rd.
City Hendersonville
State / Zip Code N.C. 28792
County Henderson
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
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
Whitewater Environmental, LLC
417 C.C. Lovelace Rd.
Rutherfordton
N.C. 28139-8345
[phone]
(N/A)
[e-mail]
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DocuSign Envelope ID: E4A31513-705C-4491-814E-1280C736224A
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 ❑ Number of Employees
Commercial ❑ Number of Employees
Residential X Number of Homes
School ❑ Number of Students/Staff
Other ❑ Explain:
49
Describe the source(s) of wastewater (example: subdivision, mobile home park, shopping centers,
restaurants, etc.):
Mobile Home Park
Number of persons served: 124
5. Type of collection system
X 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 X No
7. Name of receiving stream(s): (NEW applicants: Provide a map showing the exact location of each
outfall):
Unnamed tributary to Clear Creek.
8. Frequency of Discharge: X 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.
Facility is an extended aeration treatment process and consists of:
1 Influent Lift Station (550 gals.), 1 Flow Equalization Basin (4,100 gals.), 1 Splitter Box
(2'W x 2'L x 1'D), Dual Aeration Basins (5,000 gals. Each), Dual Clarifiers (5,200 gals.
Each), 1 Chlorine Contact Chamber (1,031 gals.), 1 DeChlorination Box, 1Sludge Holding
Aerobic Digester (2,062 gals.). Chlorine and DeChlorination units are tablet fed. Facility
is designed for 85% removal.
The Equalization basin was added in 2007 through an approved Authorization to
Construct.
2 of 3 Form-D 11/12