HomeMy WebLinkAboutNC0085979_Fact Sheet_20210614Fact Sheet
Renewal May 2021 -- NPDES Permit NC00 85979
Page 1
DE Q / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NC0085979
J oe R. Corporon, P.G., Compliance & Expedited Permitting Unit 14Jun2021
Facility Information
Applicant: NCDOT – Roadside Environmental Unit
Facility Name: NCDOT- Rosman Maintenance Facility
Site Contact: Ms. Sheri Knox [sheri.knox@woodplc.com]
Applicant Address: 4809 Beryl Road, Raleigh, NC 27606
Facility Address: 100 Old Calvert Landfill Rd, Brevard, NC 287 16
Permitted Flow 0.0288 MGD
Type of Waste: Chlor ide (r oadside salt storage facility) Ground Water Remediation –
incidental parameters of concern (POCs) from landfill offsite.
Facility Class/Permit Status: PCNC/ Renewal
County: Transylvania
Miscellaneous
Receiving Stream: French Broad River Regional Office: ARO
Stream Classification: B; Trout 8-Digit HUC: 06010105
303(d) Listed? No Permit Writer: Joe R. Corporon, P.G.
Subbasin/ Stream Index: 04-03-01/ 6-(1) Date: 14Jun2021
Drainage Area (mi2): 103
Long: 82°47’57” W Lat: 35°08’56” N
Summer 7Q10 (cfs) 72
Winter 7Q10 (cfs): 86
Average Flow (cfs): 340
IWC (%): 0.06 %
Primary SIC Code: 4952
SITE HISTORY :
NCDOT operates a 0.0288 MGD Ground Water Remediation (GW-REM) facility originally permitted
under General Permit NCG510365. In 1992, investigators detected a plume of salt (sodium chloride) in the
groundwater less than 1 mile from the former salt-storage facility operated by the NCDOT. NCDOT
monitored the plume from 1992 to 1998. Samples collected on 19Oct1995 from well MW-3 revealed the
highest salt concentrations of 9,950 mg/L.
Af ter performing an EAA in 1996, Ashville Regional Office (ARO) suggested that the facility pump the
contaminated groundwater and discharge it into the French Broad River. On 02Oct1979 DWR issued
NCDOT-Rosman Maintenance Facility NP DES permit NC0085979 with monitoring requirements. In April
2008, the pumping system was modified by adding a fou rth pumping well with lower chloride
concentrations and a mixing tank to blend water from all four wells.
On 04Feb20 17, DWR acknowledged Ch an ge of Ownership from NCDOT Fleet and Material
Management Unit (Equipment Unit) to NCDOT Roadside Environmental Uni t, site contact Ms. Sheri
Knox [sheri.knox@woodplc.com].
FACILITY SUMMARY :
Th is facility pumps groundwater from four (4) recovery wells contaminated with chlorides (road salt).
The Permittee is required to continuously monitor flow and sample monthly for chloride and pH.
Quarterly monitoring is required for organic chemicals using EPA Methods 624 & 625 and Acute
To xicity [TGE6C.] (Fathead Minnow) Pass/Fail.
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
Page 2
RECEIVING STREAM :
The headwater s of the French Broad River originate in Transylvania County in Subbasin 04-03-01. Most of
this Subbasin is forested; half of the land is protected as part of the Pisgah National Forest. Although
previously impaired for turbidity (2012), the receiving segment for this discharge is not listed on North
Carolina’s final 2018 303(d) list.
TOXICITY TESTING:
Current Requirement: Acute P/F [TGE6C.] @ 90% eff luent concentration (no changes recommended for
renewal). Updated permit text.
COMPLIANCE SUMMARY:
The facility has passed all 40 WET tests from January 2010 through January 20 21. BIMS has no violation
on record for the period Jan2018 – Mar2021. BIMS shows prior monitoring frequency violations only for
EPA 624/625, 2011-2015, no action (BPJ).
DISCHARGE SUMMARY:
The Rosman Maintenance Facility has a permitted flow limit of 0.0288 MGD [no changes recommended].
Over the previous permit cycle, f lows have averaged between 0.012 and 0.014 MGD. It is noteworthy that
the French Broad River offer s a huge dilution factor (0.06 %), an Instream Waste Concentration (IWC) less
than 1%.
EPA 624/625 Monitoring - These tests do not target chloride salts, but rather target an inactive county
landfill located adjacent to the DOT facility. No parameters were detected by methods 624/625 during the
last permit cycle however there are test-method practical quantitation levels (POLs) to consider (see Table
4). Monitoring wells onsite have historically detected vinyl chloride, benzene, tetrachloroethene,
trichloroethene, and xylenes migrating from the landfill towards the site pumping ar ea.
As a periodic spot check, EPA Methods 624/625 will continue for renewal to specify the parameters listed
on the permit effluent page, Table A. (1.), Footnote 4. Quarterly sampling utilizing EPA Methods 624/625
for the listed chemicals were not detected above test-method PQLs (Jan2018-Dec2020) – see summary
Table 4.
o
INSTREAM MONITORING:
Not in current permit. Because of the extremely low IWC (0.06%), stream monitoring is not recommended.
Table 2 – ANNUAL FLOW (MGD) SUMMARY – database Jan2018-Dec2020
Year Maximum
F low
Minimum
F low
Average
Flow
Number of
Discharges
2018 0.0174 0.0078 0.0128 365
2019 0.01085 0.0057 0.0125 365
2020 0.0157 0.0097 0.0135 365
2021 0.0144 0.0137 0.0140 30
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
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Table 3 – MONTHLY FLOWS (in MGD) – Documentation of Highest Monthly Average
(EDMR database Jan2018-Dec2020): Monthly Average Maximum flow reported = 0.0148 MGD
[Jun2019]. DWR used this flow for reasonable potential analysis (RPA), as conservative in favor of the
environment (see RPA discussion below).
2018 Aver age
Flow
Number of
Discharges
Per Month (episodic)
Jan 0.00 91 31
Feb 0.0117 28
Mar 0.0115 31
Apr 0.0130 30
Ma y 0.0144 31
Jun 0.0146 30
Jul 0.0122 31
Aug 0.0132 31
Sep 0.0141 30
Oct 0.0131 31
Nov 0.0135 30
Dec 0.0126 31
2019 Average
Flow
Number of
Dischar ges
Per Month (episodic)
Jan 0.0089 31
Feb 0.0097 28
Mar 0.0104 31
Apr 0.0105 30
Ma y 0.0133 31
Jun 0 .0148* 30
Jul 0.0146 31
Au g 0.0141 31
Sep 0.0139 30
Oct 0.0137 31
Nov 0.0136 30
Dec 0.0126 31
2020 Average
Flow
Number of
Discharges
Per Month (episodic)
Jan 0.0133 31
Feb 0.0142 29
Mar 0.0131 31
Apr 0.0111 30
Ma y 0.0130 31
Jun 0.0140 30
Jul 0.0139 31
Aug 0 .0138 31
Sep 0 .0138 30
Oct 0.0138 31
Nov 0.0142 30
Dec 0.01 40 31
Jan2021 0.0140 31
* highest average monthly for three years (flow used for RPA).
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
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Table 4 – EPA Methods 624/625 - Analytical Results Summary
EPA 624/625
Parameters of Concern
(POCs)
Current
SWQ
Standard
Practical Quantitation
Level (PQL)
(First /Second PQL = subsequently
refined test method)
X = Not
Detected
2,4-Dinitrophenol none 50 µg/L X
2-Chloroethylvinyl ether none 10 µg/L / 5 µg/L X
3,3-Dichlorobenzidine none 25 µg/L / 10 µg/L X
4,6-Dinitro-2-methylphenol Aesthetic 20 µg/L / 10 µg/L X
4-Nitrophenol None 25 µg/L / 10 µg/L X
Acrolein 400 µg/L 50 µg/L / 5 µg/L X
Acrylonitrile 7 µg/L 50 µg/L / 5 µg/L X
Benzidine 0.001 µg/L 50 µg/L X
Hexachlorocyclopentadine 4 µg/L 10 µg/L X
Pentachlorophenol Aesthetic 10 µg/L X
Bis (2-Ethylhexyl) Phthalate 0.37 µg/L 5 µg/L [common lab contaminant] X
Toluene 11 µg/L 2 µg/L /1 µg/L X
Ethylbenzene 130 µg/L 2 µg/L /1 µg/L X
Total Xylenes 670 µg/L 1 µg/L X
Lab Test Method PQL r eported insufficiently sensitive to detect SWQ standard. Based on DMR data
(Jan2018 thr u Mar 20210), a note will be added to the permit cover letter instruction the Permitt ee to
inquire of its laboratory if these parameters were or are tested at the “limits of technology.” Follow-up
eDMRs may be required.
Reasonable Potential Analysis (RPA):
Some analyses could not be evaluated due to dilution PQLS reported by EPA methods 624/625 (Table 4).
Because of the PQLs, the Division could not conduct a viable RPA for toxicants other than Chloride.
Therefore, a viable RPA was conducted on Chloride only indicating no reasonable potential [max predicted
752 mg/L; allowable 722,112 mg/L]. However, the Division has added, as a POC, Benzidine (carcinogenic
discharge to Class B; Trout waters), monitoring only, no limit (BPJ), due to the extreme PQL 50 µg/L vs
standard at 0.001 µg/L [see Table 4]. The Permittee will be admonished to meet the limits of technology.
Table 5 – COMPLIANCE AND REGULATORY BASIS FOR PERMIT EFFLUENT LIMITATIONS :
EFFLUENT
CHARACTERISTICS
EFFLUENT
LIMITS
MONITORING
REQUIREMENTS RATIONALE FOR
LIMITATION Measurement
Frequency
Sample
Type
Flow 0.0288 MGD Continuous Recording 15A NCAC 02B.0400 et seq.,
02B .0500 et seq.
Whole Effluent
Toxicity (Acute)
All “Pass” last 13
Quarterly tests Quarterly Grab 15A NCAC 02B. 0200 et seq.
EPA Methods 624/625
(ug/L)
PQLs insufficient for
some analytes Quarterly Grab Best Professional Judgment
(BPJ )
Chloride (mg/L) Max = 671 mg/L; Min
= 52; Ave = 260 mg/L Monthly Grab 15A NCAC 02B.0211,
RPA, BPJ
pH standard units ≥ 6.0 and ≤ 9.0 S.U. Monthly Grab 15A NCAC 02B.0211,
NCG510000 Consistency
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
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SUMMARY OF PROPOSED PERMIT CHANGES :
The following permit changes are proposed for this permit renewal:
1. Added Benzidine monitoring only, no limit [see A. (1.)].
2. updated WE T-test language [see A. (2.)].
3. updated text for electronic reporting requirements. [see A. (3.)].
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: May 11, 202 1
[Tentative] Permit Scheduled to Issue: June 25, 202 1
[Tentative] Effective date Augu st 1 , 20 2 1
If you have questions, email [joe.corporon@ncdenr.gov]
______________________________________________________________
Joe R. Corporon, P.G., NPDES Unit. 14Jun2021
NPDES Implementation of Instream Dissolved Metals Standards – Freshwater Standards
The NC 2007 -2015 Water Quality Stand ard (WQS) Trienn ial Rev iew was approved by the NC
Environmental Manage ment Commission (EMC) on November 13, 2014. The US EPA
subseq uently approved the WQS revisions on April 6, 2016, with some exceptions. There fore,
metal limits in draft permits out to pu blic notice afte r April 6, 2016 must be calculated to protect
the new stand ards - as approve.
Table 6 . NC Dissolved Metals Water Q uality Standards/Aquatic Life Protection
Parameter Acute FW, µg/l
(Dissolved)
Chronic FW, µg/l
(Dissolved)
Acute SW, µg/l
(Dissolved )
Chron ic SW, µg/l
(Dissolved)
Arsenic 340 150 69 36
Beryllium 65 6.5 --- ---
Cadmium Calculation Calculation 40 8.8
Fact Sheet
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Ch romium III Calculation Calculation --- ---
Chromium VI 16 11 1100 50
Copper Calculation Calculation 4.8 3.1
Lead Calculatio n Calculation 210 8.1
Nickel Calculation Calculation 74 8.2
Silver Calculation 0.06 1.9 0.1
Zinc Calculation Calculation 90 81
Table 6 Notes:
1. FW= Freshwate r, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards lis ted above are expresse d 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 stand ards for all metals). It is still
necessary to evalua te total recoverable a quatic life and human health standards listed in
15A NCAC 2B.0200 (e.g., arsenic at 10 µg/l for human health p rotection; cyanide at 5
µg/L a nd fluo ride at 1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Har dness-Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Su bparagraph (11)(d)
Metal NC Dissolv ed Standard, µg/l
Ca dmium, Acute WER*{1.1 36672-[ln hardness](0.041838)} ∙ e^{0.9151 [ln hardness]-3.1485}
Cadmium, Acute Trout waters WER*{1.136672-[ln h ardness](0.041838)} ∙ e^{0.9151[ln hardness]-3.6236}
Cadmium, Chronic WER*{1.101672-[ln hardness](0.041838)} ∙ e^{0.79 98[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[ln 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}
Lea d, Acute WER*{1.46203 -[ln hardness](0.145712)} ∙ e^{1.273[ln hardness]-1.460}
Lead, Chronic WER*{1.46203 -[ln hardness](0.145712)} ∙ e^{1.273[ln hardness]-4.705}
Nickel, Acute WER*0.998 ∙ e^{0.8460[ln hardness]+2.255}
Nickel, Chron ic WER*0.997 ∙ e^{0.8460[ln hardness]+0.0584}
Silver, Acute WER*0.85 ∙ e^{1.72[ln hardness]-6.59}
Silver, Chronic Not applicable
Zin c, Acute WER*0.978 ∙ e^{0.8473[ln hardness]+0.884}
Zinc, Chronic WER*0.986 ∙ e^{0.8473[ln h ardness]+0.884}
General Information on the Re asonable Potential Analysis (R PA)
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 to
establish the numeric s tandard for each metal of conc ern of each individual discharge.
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
Page 7
The hardness-based standards require some knowledge of the effluent and instream (upstream)
hardness and so must be calculated case -by -case fo r each discharge.
Metals limits must be expresse d 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 gene rally rely on defa ult 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 m aximum 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 va lues fo r the receiving stream .
If the maximum predicted value is greater than the maximu m allowed value (chronic or ac ute), the
discharge has reasonable potential t o exceed the standard, which warrants a permit limit in most
cases. If monitorin g for a particular pollutant indicates that the pollutant is not present (i.e.
consistently below de tection level), then the Divis ion 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, 7 Q10 (the spreadsheet automatic ally
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 classif ication
2. In order to establish the numeric standard for each hardness -dependent metal of concern
and for each indiv idual discharge, the Permit Writer must first determine what effluent and
instre am (upstrea m) hard ness values to use in the equations.
The p ermit writer reviews DMR’s, Ef fluent Po llutant Scans, and Toxicity Te st 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 av ailable, the permit writer may choose to do an initial evaluation
usin g a default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum
limits on the hardness value used for wat er quality calculations are 25 mg/L and 400 mg/L,
respectively.
If th e use of a default hardness va lue results in a hardness -dependent meta l showing
reasonable potential, the permit writer contacts the Permittee and requests 5 site -specific
effluent and u pstream hardness samples over a period of one week. The RPA is rerun u sing
the new data. The overall hardness value used in the water quality calculations is calculated
as follows:
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
Page 8
Combined Hardness (chronic) =
(Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) x (s7Q10, cf s *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the c alculation uses the 1Q10 flow.
3. The permit writer converts the numeric standard for each me tal of concern to a total
recoverable metal, using the EPA Default Partition Co e fficients (DPCs) or site -specific
translators, if any have been developed using feder ally approved methodology.
4. The numeric standard for each metal of concern is divided by the default partitio n
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 conce rn 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
develo pment f or metals. For more in formation on conversion factors see the June, 1996
EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass ba lance equation to determine the total allowable
concentration (permit limits) for each pollutant using the following equation:
Ca = (s7 Q10 + Qw) (Cwqs) – (s7Q10) (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 ex cept NH3 * (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q10)
s7Q10 = 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
EPA default part ition coefficients or the “Fraction Dissolved” converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream amb ient
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 8 23-B-96-007, June 19 96) and the equation:
_Cdiss__ = _______1_______________
Ctotal 1 + { [Kpo] [ss(1+a)] [10 -6] }
Where:
ss = in -stream suspended solids concentration [mg/l], minimum of 10 mg/L used, and
Kpo and a = constants that express the equilibrium relationship between dissolv ed and
adso rbed forms of metals. A list of constants used for each hardness-dependent metal can
also be found in the RPA program under a sheet labeled DPCs.
Fact Sheet
Renewal June202 1 -- NPDES NC00 85979
Page 9
Flows other than s7Q10 may be incorporated as applicable:
1Q10 = used in the equation to protect aquatic life from acute toxicity
QA = used in the equation to protect human hea lth through the consumption o f
water, fish, and shellfish from carcinogens
30Q2 = used in the equation to protect ae sthetic quality
6. The permit writer enters the mos t recent 2 -3 years of effluent data for each pollutant of
concern. Data entered must have b een taken within four and one -half years prior to the date
of the permit applic ation (40 CFR 122.21). The RPA sprea dsheet estimates the 95th
percentile upper concentration of each pollutant. The Predicted Max concentrations are
compared to the Total allo wable c oncentrations to determine if a permit lim it is necessary.
If the predicted max exceeds the acute or chronic Total allo wable concentrations, the
discharge is considered to show reasonable potential to violate the water quality standard,
and a permit limit (Total allowable conce ntration) is include d in the permit in accordance
with th e U.S. EPA Technical Support D ocument fo r Water Quality -Based Toxics Control
published in 1991.
7. When appropriate, permit writers develop facility specific compliance sch edules in
accordance with the EPA Headquarters Me m o dated May 10, 2007 from Jam es Hanlon to
Alexis Strauss on 40 CFR 122.47 Co mpliance Schedule Requirements.
8. The To tal Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromiu m Water Quality Standards. As a cost savings meas ure, total chromium
data results may be used as a conservative surrogate in cases where there are no analytical
resu lts based on chromium III or VI. In these cases, the projected maximum concentration
(95th %) for total chromium will be compared against wa ter quality standards for
chro m ium III and chromium VI.
9. Efflue nt hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for har dness-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 Effluen t 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
1Q10 (cfs) N/A No RPA necessary
Permitted Flow (MGD) N/A No RPA necessary
ROY COOPER l'g
c:nverna
t.1:,,,,—
4'
MICHAEL S.REGAN 0...,. 4
Secretary
LINDA CULPEPPER NORTH CAROLINA
pireaor Environmental Quality
November 21, 2019
NCDOT-Roadside Environmental Unit
Attn: Sheri Knox, P.E.
4021 Stirrup Creek Drive, Ste 100
Durham, NC 27703
Subject: Permit Renewal
Application No. NC0085979
Rosman Maintenance Facility
Transylvania County
Dear Applicant:
The Water Quality Permitting Section acknowledges the November 21, 2019 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. 150E-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.
Sincerely,
7141
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
North Caro•nsDepartmentofEnvironmentalQuality I D+vso of
WaterResouroesD_E -Ashev.a Regona Offoe 12090 U.S.70 k ghway I S..annanoa,North Caro ra 28778
a--' .'+.' 828 29S4500
wood.
LETTER OF TRANSMITTAL
TO: North Carolina Department of DATE: 11/15/19
Environment and Natural Resources PROJECT NO.: 6480166127
Rosman Maintenance
Division of Water Quality/ NPDES Unit PROJECT NAME: Facility
1617 Mail Service Center
Raleigh, NC 27699-1617 SUBMITTED BY: Sheri Knox
THE ENCLOSED DOCUMENTS AND/OR DRAWINGS ARE SUBMITTED:
FOR YOUR APPROVAL AS REQUESTED FOR YOUR REVIEW AND COMMENT
FOR YOUR INFORMATION FOR YOUR SIGNATURE FINAL REPORT DOCUMENT
NUMBER OF
COPIES:
DESCRIPTION:
1 Hard Copy of NPDES Permit Application — Short Form C - GW
RECEIVED
NOV 21 2019
NCDEQIDWR/NPDES
REMARKS:
Wood Environment&Infrastructure Solutions,Inc.
4021 Stirrup Creek Drive,Suite 100
Durham,North Carolina 27703
Tel:(919)381-9900/Fax:(919)381-9901
www.woodolc.com
Licensure:NC Engineering F-1253/NC Geology C-247
NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC0085979
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 NCDOT Roadside Environmental Unit
Facility Name Rosman Maintenance Facility
Mailing Address 4021 Stirrip Creek Drive, Suite 100
City Durham
State / Zip Code NC 27703
Telephone Number 919)381-9900
Fax Number 919)381-9901
e-mail Address sheri.knox@woodplc.com
2. Location of facility producing discharge:
Check here if same as above
Street Address or State Road 100 Old Calvert Landfill Road
City Brevard
State / Zip Code NC 28716
County Transylvania
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name Jeff Walston
Mailing Address 1557 Mail Service Center
City Raleigh
State / Zip Code NC 27699
Telephone Number 919)707-2944
Fax Number 919)715-2554
4. Ownership Status:
Federal D State ® Private Public
Page 1 of 3 C-GW 03/05
NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
5. Products recovered:
Gasoline Diesel fuel Solvents El Other Chloride
6. Number of separate discharge points: 1
Outfall Identification number(s) 001
7. Frequency of discharge: Continuous ® Intermittent
If intermittent:
Days per week discharge occurs: Duration:
8. Treatment System Design flow 0.0288 MGD
9. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
French Broad River
10. Please list all additives to the treatment system, including chemicals or nutrients, that
have the potential to be discharged.
None
11. Is this facility located on Indian country? (check one)
Yes No
12. Additional Information
All applicants (including renewals):
A USGS topographical map (or copy of the relevant portion) which shows all outfalls
A summary of the most recent analytical results (effluent data, if available) containing the
maximum values for each chemical detected
NEW Applicants only:
Engineering Alternative Analysis
Description of remediation treatment system components, capacities, and removal
efficiency for detected compounds.
If the treatment system will discharge to a storm sewer, written approval from the
municipality responsible for the sewer.
A list of any chemicals found in detectable amounts at the site, with the maximum
observed concentration reported for each chemical (the most recent sample must be
collected less than one year prior to the date of this application)
For petroleum-contaminated sites -Analyses for Volatile Organic Compounds (VOC) should
be performed. Analyses for any fuel additives likely to be present at the site and for phenol
and lead should also be performed.
For sites contaminated with solvents or other contaminants - EPA Method 624/625
analysis should be performed.
Page 2 of 3 C-GW 03/05
NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
13. Applicant Certification
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.
Sheri Knox Associate Remediation Engineer
Printed name of Person Signing Title
cif , 9
Signature of Appli nt Date
North Carolina General Statute 143-215.6 (b)(2) provides that: 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.)
Page 3 of 3 C-GW 03/05
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Table 1
Summary of Recent Analytical Results
NCDOT Rosman Maintenance Facility
100 Old Calvert Road, Brevard, North Carolina
Effluent Characteristics Monitoring Requirements Effluent Limits
Maximum
Parameter Measurement Measurement Value
Permit Constituent Code Method Frequency Sample Type Permit Limit Detected1'2qYPYP
Flow3 50050 Effluent Meter Continuous Recording 0.0288 MGD 0.0139 MGD
pH3 00400 Field Measurement Monthly Grab >_6.0 and<_9.0 SU 6.1 SU
3 00940 EPA Method 300.0 MonthlyGrab NE 214 mg/LChloride
Acute Toxicity4 TGE6C Fathead Minnow Quarterly Grab NE Pass
VOCs4.5 76029 EPA Method 624 Quarterly Grab NE ND
SVOCs4,5 76028 EPA Method 625 Quarterly Grab NE ND
5.Chemicals to be monitored as referenced in permit
2-Chloroethylvinyl ether 76029 EPA Method 624 Quarterly Grab NE 10
2,4-Dinitrophenol 76028 EPA Method 625 Quarterly Grab NE 48.5
3,3'-Dichlorobenzidine 76028 EPA Method 625 Quarterly Grab NE 24.3
4,6-Dinitro-2-methylphenol 76028 EPA Method 625 Quarterly Grab NE 19.4
4-Nitrophenol 76028 EPA Method 625 Quarterly Grab NE 48.5
Acrolein 76029 EPA Method 624 Quarterly Grab NE 5
Acrylonitrile 76029 EPA Method 624 Quarterly Grab NE 50
Benzidine 76028 EPA Method 625 Quarterly Grab NE 48.5
Hexachlorocyclopentadine 76028 EPA Method 625 Quarterly Grab NE 9.7
Pentachlorophenol 76028 EPA Method 625 Quarterly Grab NE 9.7
Toluene 76029 EPA Method 624 Quarterly Grab NE 1
Bis(2-Ethylhexyl)Phthalate 76028 EPA Method 625 Quarterly Grab NE 4.9
Ethylbenzene 76029 EPA Method 624 Quarterly Grab NE 1
Xylenes 76029 EPA Method 624 Quarterly Grab NE 3
Notes:
1.Concentrations based on analytical results from most recent sampling event,based on measurement frequency and NPDES permit application short form C-
GW instructions.
2.All units are in micrograms per liter(ug/L),unless noted otherwise.
3.Results from last monthly sample collected on September 20,2019.
4.Results from last quarterly sample collected on July 29,2019.
NA=Not applicable.
ND=Not detected;concentration below laboratory reporting limit.
NE=Not established.
MGD=Million gallons per day.
SU=Standard unit.
mg/L=milligrams per liter.
2.2=Concentration below laboratory reporting limit.
Completed By:D.Young Date:October 28,2019 Reviewed By:J. Malik Date:October 30,2019
State of North Carolina | Environmental Quality | Water Resources
1617 Mail service Center | Raleigh, North Carolina 27699-1617
919 707 9000
PAT MCCRORY
Governor
DONALD R. VAN DER VA ART
Secretary
S. JAY ZIMMERMAN
Director
February 11, 2016
Mr. David Hill, Engineering Technician
Soil & Water Engineering, REU/NCDOT
1557 Mail Service Center
Raleigh, North Carolina 27699-1557
Subject: Issuance of NPDES Permit Renewal
Permit No. NC0085979
NCDOT-Rosman Maintenance Facility
Transylvania County
Facility Class PCNC
Dear Mr. Hill:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued
pursuant to the requirements of North Carolina General Statute 143-215.1 and Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency dated October
15, 2007 (or as subsequently amended).
No changes were made to the draft permit sent to you on September 23, 2015. The final permit
authorizes the NCDOT to discharge wastewater from its Rosman Maintenance Facility to French
Broad River, a class B-Trout water in the French Broad River Basin. The permit includes discharge
limitations or monitoring for flow, pH, chloride, and organic compounds (EPA Methods 624/625).
According to the definition of Physical Chemical Non Category (PCNC) provided by the NC DWR
Operator Certification Program and the agreement from the ARO that this facility does not require
an ORC, the Rosman Maintenance Facility was reclassified as PCNC. Please note that PCNC class
only indicates the Division is not requiring designated operators. All other permit requirements
shall remain in force.
As identified previously, the renewal permit contains the following significant changes from
your current permit:
The requirement to begin reporting discharge monitoring data electronically using the NC
DWR’s Electronic Discharge Monitoring Report (eDMR) internet application has been added
to your NPDES permit. [See Special Condition A.(3.)]
For information on eDMR, registering for eDMR and obtaining an eDMR user account, please
visit the following web page: http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr.
For information on EPA’s proposed NPDES Electronic Reporting Rule, please visit the
following web site: http://www2.epa.gov/compliance/proposed-npdes-electronic-reporting-
rule.
Limitations for pH have been added in accordance with surface water quality standards in
15A NCAC 2B .0211.
Effluent sampling data for chloride did not show reasonable potential to violate NC water
quality standards and the maximum predicted concentration was less than half of allowable
concentration. As a result, chloride limitations were not put in the permit; however,
monitoring was maintained since chloride is the primary pollutant of concern.
Some of the wording has changed in Special Condition A. (2.), Acute Toxicity monitoring,
please review each paragraph carefully.
The Permittee shall notice that the test results for EPA Methods 624/625 are required to include
those parameters listed in the permit effluent limitation page under Footnote #4. The list is as
follows: 2,4-Dinitrophenol, 2-Chloroethylvinyl ether, 3,3-Dichlorobenzidine, 4,6-Dinitro-2-
methylphenol, 4-Nitrophenol, Acrolein, Acrylonitrile, Benzidine, Hexachlorocyclopentadine,
Pentachlorophenol, Toluene, Bis (2-Ethylhexyl) Phthalate, Ethylbenzene, and Xylenes.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental permits that may be required.
If you have questions concerning this permit, please contact Yang Song by e-mail
(yang.song@ncdenr.gov) or phone at (919) 807-6479.
Sincerely,
Original Signed by Julie Grzyb
S. Jay Zimmerman, P.G.
Director, Division of Water Resources
Enclosure: NPDES Permit NC0085979
cc: NPDES Unit
Central Files
Asheville Regional Office / Water Quality Program
e-copy:
Susan Meadows, Aquatic Toxicity Branch
Permit NC0085979
Page 1 of 6
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
North Carolina Department of Transportation
is hereby authorized to discharge wastewater from a facility located at the
NCDOT Rosman Maintenance Facility
100 Old Calvert Landfill Road
Brevard, NC 28716
Transylvania County
to receiving waters designated as the French Broad River in the French Broad River Basin
in accordance with effluent limitations, monitoring requirements, and other applicable conditions set
forth in Parts I, II, and III hereof.
This permit shall become effective March 1, 2016.
This permit and authorization to discharge shall expire at midnight on September 30, 2020.
Signed this day February 11, 2016.
Original Signed by Julie Grzyb
S. Jay Zimmerman, P.G.
Director, Division of Water Quality
By Authority of the Environmental Management Commission
Permit NC0085979
Page 2 of 6
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit
issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to
operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included
herein.
North Carolina Department of Transportation is hereby authorized to:
1. Continue to operate an existing groundwater remediation system consisting of four (4) recovery
wells, a shed containing a control panel and flow meters, and a 4-inch diameter discharge line
that extends to the river along SR 1129 located at NCDOT Rosman Maintenance Facility, 100
Old Calvert Landfill Road, Brevard NC, Transylvania County, and
2. Discharge from said treatment works at the location specified on the attached map into the
French Broad River, classified B-Trout waters in the French Broad River Basin.
Permit NC0085979
Part I, Page 3 of 6
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge from outfall 001. Such discharges shall be limited and monitored1 by the Permittee as
specified below:
EFFLUENT
CHARACTERISTICS
EFFLUENT LIMITS MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type Sample Location
Flow 2 0.0288
MGD Continuous Recording Effluent
Acute Toxicity 3 Quarterly Grab Effluent
EPA Methods 624/625 4 Quarterly Grab Effluent
Chloride Monthly Grab Effluent
pH ≥ 6.0 and ≤ 9.0 S.U. Monthly Grab Effluent
Footnotes:
1. No later than 270 days from the effective date of this permit, begin submitting discharge monitoring reports
electronically using NC DWR’s eDMR application system. See Special Condition A.(3.).
2. All volumes of wastewater leaving the facility shall be monitored.
3. Acute toxicity (Fathead Minnow) Pass / Fail at 90% during the months of January, April, July and October.
Samples for EPA Methods 624/625 should be collected at the same time as the acute toxi city test sample.
4. Chemicals that are to be monitored using an EPA approved method equivalent to the detection levels obtainable by
Method 624 and 625 or better are as follows:
2,4-Dinitrophenol,
2-Chloroethylvinyl ether,
3,3-Dichlorobenzidine,
4,6-Dinitro-2-methylphenol,
4-Nitrophenol,
Acrolein,
Acrylonitrile,
Benzidine,
Hexachlorocyclopentadine,
Pentachlorophenol,
Toluene,
Bis (2-Ethylhexyl) Phthalate,
Ethylbenzene, and
Xylenes
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Permit NC0085979
Part I, Page 4 of 6
A.(2.) ACUTE TOXICITY MONITORING (QUARTERLY)
[15A NCAC 02B .0500 et seq.]
The Permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North
Carolina Procedure Document entitled “Pass/Fail Methodology For Determining Acute Toxicity In A Single
Effluent Concentration” (Revised-December 2010 or subsequent versions). The monitoring shall be performed
as a Fathead Minnow (Pimephales promelas) 24 hour static test. The effluent concentration at which there
may be at no time significant acute mortality is 90% (defined as treatment two in the procedure document).
The tests will be performed during the months of January, April, July and October. These months signify
the first month of each three month toxicity testing quarter assigned to the facility. Effluent sampling for this
testing must be obtained during representative effluent discharge and shall be performed at the NPDES
permitted final effluent discharge below all treatment process es.
The parameter code for Pimephales promelas is TGE6C. All toxicity testing results required as part of this
permit condition will be entered on the Effluent Discharge Form (MR-1) for the month in which it was
performed, using the appropriate parameter code. Additionally, DWR Form AT-2 (original) is to be sent to the
following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1623 Mail Service Center
Raleigh, North Carolina 27699-1623
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days
after the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent
toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during any month, the Permittee will complete the
information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number,
pipe number, county, and the month/year of the report with the notation of “No Flow” in the comment area of
the form. The report shall be submitted to the Water Sciences Section at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately. Upon submission of a valid test, this monthly test requirement will revert to
quarterly in the months specified above
Should any test data from either these monitoring requirements or tests performe d by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened
and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival and appropriate environmental controls, shall constitute an invalid test and will require
immediate follow-up testing to be completed no later than the last day of the month following the month of the
initial monitoring.
Permit NC0085979
Part I, Page 5 of 6
A. (3.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
specify that, if a state does not establish a system to receive such submittals, then permittees must submit
DMRs electronically to the Environmental Protection Agency (EPA). The Division anticipates that these
regulations will be adopted and is beginning implementation in late 2013.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
Section B. (11.) Signatory Requirements
Section D. (2.) Reporting
Section D. (6.) Records Retention
Section E. (5.) Monitoring Reports
1. Reporting [Supersedes Section D. (2.) and Section E. (5.) (a)]
Beginning no later than 270 days from the effective date of this permit, the permittee shall begin reporting
discharge monitoring data electronically using the NC DWR’s Electronic Discharge Monitoring Report
(eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and submitted
electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit
DMRs electronically using the internet. Until such time that the state’s eDMR application is compliant with
EPA’s Cross-Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR
submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR
to the following address:
NC DENR / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being
physically located in an area where less than 10 percent of the households have broadband access, then a
temporary waiver from the NPDES electronic reporting requirements may be granted and discharge monitoring
data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3) or alternative forms approved by the Director.
Duplicate signed copies shall be submitted to the mailing address above.
Requests for temporary waivers from the NPDES electronic reporting requirements must be submitted in
writing to the Division for written approval at least sixty (60) days prior to the date the facility would be
required under this permit to begin using eDMR. Temporary waivers shall be valid for twelve (12) months and
shall thereupon expire. At such time, DMRs shall be submitted electronically t o the Division unless the
permittee re-applies for and is granted a new temporary waiver by the Division.
Information on eDMR and application for a temporary waiver from the NPDES electronic reporting
requirements is found on the following web page:
http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
Permit NC0085979
Part I, Page 6 of 6
Regardless of the submission method, the first DMR is due on the last day of the month following the issuance
of the permit or in the case of a new facility, on the last day of the month following the commencement of
discharge.
2. Signatory Requirements [Supplements Section B. (11.) (b) and supersedes Section B. (11.) (d)]
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B.
(11.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A
person, and not a position, must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and
login credentials to access the eDMR system. For more information on North Carolina’s eDMR system,
registering for eDMR and obtaining an eDMR user account, please visit the following web page:
http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
Certification. Any person submitting an electronic DMR using the state’s eDMR system shall make t he
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
3. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These
records or copies shall be maintained for a period of at least 3 years from the date of the report. This period
may be extended by request of the Director at any time [40 CFR 122.41].
NC DOT -Rosman
North
Latitude:35o08’56”Sub-Basin:04-03-01
Longitude:82o47’57”
Quad #:G7NE/ Rosman
Stream Class:C-Trout
Receiving Stream:French Broad River
Permitted Flow:0.0288 MGD
NC DOT
NC0085979
Rosman Maintenance Facility
Facility
Location
Discharge Point
x
Public Notice
North Carolina Environmental Management Commission/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a NPDES Wastewater Permit NC0085979 Rosman
Maintenance Facility The North Carolina Environmental Management
Commission proposes to issue a NPDES wastewater discharge permit to the
person(s) listed below. Written comments regarding the proposed permit will be
accepted until 30 days after the publish date of this notice. The Director of t he NC
Division of Water Resources (DWR) may hold a public hearing should there be a
significant degree of public interest. Please mail comments and/or information
requests to DWR at the above address. Interested persons may visit the DWR at
512 N. Salisbury Street, Raleigh, NC 27604 to review information on
file. Additional information on NPDES permits and this notice may be found on
our website: http://deq.nc.gov/about/divisions/water-resources/water-resources-
permits/wastewater-branch/npdes-wastewater/public-notices,or by calling (919)
707-3601. The North Carolina Department of Transportation [ 4809 Beryl Road,
Raleigh, NC 27606] has requested renewal of permit NC0085979 for its Rosman
Maintenance Facility in Transylvania County. This permitted facility discharges
treated groundwater to the French Broad River in the French Broad River
Basin. Some parameters are water quality limited. This discharge may affect
future allocations in this segment of the French Broad River. (A Public Notice ad
will run in the Transylvania Times 5/17/21).
Send Comments To:
NCDEQ/DWR/NPDES
Water Quality Permitting Section
1617 Mail Service Center
Raleigh, NC 27699-1617
Or Email Comments to:joe.corporon@ncdenr.gov
Comment Period Ends: 6/16/21
View draft permit and related document
REQUIRED DATA ENTRY
Name Type Chronic Modifier Acute PQL Units
Facility Name NCDOT Brevard Par01
WWTP/WTP Class PCNC Par02
NPDES Permit NC0085979 Par03
Outfall 001 Par04
Flow, Qw (MGD)0.0148 Par05
Receiving Stream French Broad River Par06
Stream Class B; Trout Par07
7Q10s (cfs)72.00 Par08
7Q10w (cfs)86.00 Par09
30Q2 (cfs)0.00 Par10
QA (cfs)340.00 Par11
1Q10s (cfs)58.91 Par12
Data Source(s)Par13
Par14 Benzidine C 0.00014 FW 50 µg/L
Par15 Hexachlorocyclopentadine NC 0.07 FW 0.07 10 µg/L
Par16 Bis (2-Ethylhexyl) Phthalate NC 0.37 FW 5 µg/L
Par17 Chloride NC 230 TR 50 mg/L
Par18
Par19
Par20
Par21
Par22 IMPAIRED?2014 Generic RPA - 95% Probability/95% Confidence
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
0.0148 highest reported monthly average [Jun2019]
during previous permit cycle.
Table 1. Project Information Table 2. Parameters of Concern
To appy Model IWC %:
Flow ,Qw (MGD) entered
adjust 7Q10s (cfs) value
until required IWC %
obtained. 1Q10s (cfs)
defined by program.
MAXIMUM DATA POINTS = 58
85979 RPA - Chloride plus Odd Parameters pg 1 10May2021.xlsm, input
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REASONABLE POTENTIAL ANALYSISNCDOT Brevard 2014 Generic RPA - 95% Probability/95% Confidence Outfall 001
NC0085979 MAXIMUM DATA POINTS = 58 Qw = 0.0148 MGD
Qw (MGD) = 0.01 WWTP/WTP Class:PCNC
1Q10S (cfs) = 58.91 IWC @ 1Q10S = 0.0%
7Q10S (cfs) = 72.00 IWC @ 7Q10S = 0.0%
7Q10W (cfs) = 86.00 IWC @ 7Q10W = 0.0%
30Q2 (cfs) = 0.00 IWC @ 30Q2 = 100.0%
Avg. Stream Flow, QA (cfs) = 340.00 IWC @ QA = 0.0%
Receiving Stream:French Broad River Stream Class:B; Trout
PARAMETER RECOMMENDED ACTION
NC WQS /
Chronic
Applied
Standard
½ FAV /
Acute n # Det.Max Pred
Cw
Acute:NO WQS
Benzidine C 0.00014 FW(7Q10s)50 µg/L 13 13 66
Chronic:0
13 value(s) > Allowable Cw
Acute:179.83
Hexachlorocyclopentadine NC 0.07 FW(7Q10s)0.07 10 µg/L 13 13 13.1
Chronic:219.77
No value > Allowable Cw
Acute:NO WQS
Bis (2-Ethylhexyl) Phthalate NC 0.37 FW(7Q10s)5 µg/L 13 13 6
Chronic:1,162
No value > Allowable Cw
Acute:NO WQS
Chloride NC 230 TR(7Q10s)50 mg/L 37 37 752
Chronic:722,112
No value > Allowable CwPQLUNITSTYPE
(1)Allowable Cw
REASONABLE POTENTIAL RESULTSSTANDARDS & CRITERIA (2)
CHRONIC TEST N/A ASSIGN 90% ACUTE TEST
NO RP - continue monitoring as POC, no limit
NO RP - continue monitoring (624/625), no limit
NO RP - continue monitoring (624/625), no limit
RP = Yes. continue monitoring w/ limit as individual
POC (beyond 624/625)
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85979 RPA - Chloride plus Odd Parameters pg 2 10May2021.xlsm, rpa
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