NC0087998_Fact Sheet_20241109 (2)

FACT SHEET
EXPEDITED PERMIT RENEWAL
DEQ/DWR/NPDES
Basic Information for Expedited Renewal
Permit Writer/Date Joe R. Corporon,L.G. /updated 09Nov2024
Permit Number NCO087998
Facility AQUA of NC—Rand Meadows Phase II WTP
Near Ten Ten Rd and Rand Road,Wake Co.
Basin Name/Sub-basin number Neuse River/03-04-03
Receiving Stream UT to Juniper Branch
Stream Class/HUC C-NSW/
Stream Segment 27-43-15-10-1
Does permit need Daily Max NH3 limits? No
Does permit need TRC limits/language? Existin
Does permit have toxicity testing? No
Does permit have Special Conditions? No
Does permit have instream monitoring? No
Is the stream impaired on 303 d list)? No
Any obvious compliance concerns? No
Any permit MODS since lastpermit? No
Current expiration date 30A r2023
New expiration date 30A r2028
Not eligible for General Permit NCG59 due to
Comments: need to monitor TN/TP in accord w/the Neuse
Management Rules.
DRAFT RENEWAL
DWR/NPDES drafted this renewal permit in accord with the Greensand-Filter section of
the 2009 WTP permitting guidance, as amended in 2012. The following considerations
and changes to existing permit are applicable:
• reviewed discharge and compliance records in BIMS
• compliance record indicates no significant problems with treatment
operation or reporting.
• evaluated wastewater monthly average flows
• updated facility description(Supp. to Permit Cover Sheet)
• updated text of eDMR requirements [section A. (2)].
• updated site-location map
• Discontinued monitoring for Manganese (Mn)per WTP Permitting Guidance.
COMPLIANCE
Good. Since September 2021 DWR has issued no Notices of violations (NOVs)/no Civil
Penalty Assessments (CPAs), according to BIMS.
Page 1 of 7

PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: September 12, 2023
Draft submitted for final signature September 24, 2024
[Tentative] Permit Scheduled to Issue: November 15, 2024
[Tentative] Effective date January 1, 2025
NPDES Division Contact
If you have questions on any of the above information or in the attached permit, please
email Joe R. Corporon, P.G. [e-mail]].
NAME: DATE: UPDATED 09NOy2024
r
NPDES Implementing 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 Chronic FW, Acute SW, µg/l Chronic SW,
(Dissolved) µg/1 (Dissolved) µg/1
(Dissolved) (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
Page 2 of 7

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, /l
Cadmium, Acute WER*{1.136672-[In hardness](0.041838)} e^{0.9151 [ln
hardness]-3.14851
Cadmium, Acute Trout WER*{1.136672-[In hardness](0.041838)} e"{0.9151[ln
waters hardness]-3.62361
Cadmium, Chronic WER*{1.101672-[In hardness](0.041838)} e^{0.7998[ln
hardness]-4.4451}
Chromium III, Acute WER*0.316 • eA10.8190[ln hardness]+3.7256}
Chromium III, Chronic WER*0.860 eA10.8190[ln hardness]+0.6848}
Copper, Acute WER*0.960 eA10.9422[ln hardness]-1.7001
Copper, Chronic WER*0.960 eA10.8545[ln hardness]-1.7021
Lead, Acute WER*{1.46203-[In hardness](0.145712)} e All.273[In
hardness]-1.4601
Lead, Chronic WER*{1.46203-[ln hardness](0.145712)} e^{1.273[ln
hardness]-4.705}
Nickel, Acute WER*0.998 • eA10.8460[ln hardness]+2.255}
Nickel, Chronic WER*0.997 • eA10.8460[ln hardness]+0.0584}
Silver, Acute WER*0.85 • e^{1.72[ln hardness]-6.59}
Silver, Chronic Not applicable
Zinc, Acute WER*0.978 eA10.8473[ln hardness]+0.884}
Zinc, Chronic WER*0.986 eA10.8473[ln hardness]+0.884}
Page 3 of 7

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/WOBELs 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 an 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
(s7Q 10, CfS) 0.993
• Effluent hardness and upstream hardness, site-specific data is preferred
• Permitted flow
• Receiving stream classification
2. 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.
Page 4 of 7

The overall hardness value used in the water quality calculations is calculated as
follows: Combined Hardness (chronic) =
(Permitted Flow, cfs *Avg. Eff Hardness,mg/L)+s7Q10, cfs *Avg.Upstream Hardness,mg/L)
(Permitted Flow, cfs+ s7Q 10, 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 = I
Ctotal I + { [Kpo] [SS(I+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= (s7Q 10 +Qw)Cwgs)—(s7Q 10) (Cb)
Qom'
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)
Page 5 of 7

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
Flows other than s7Q10 may be incorporated as applicable:
IQ 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.
Page 6 of 7

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) Ave 216 mg/L
[Total as, CaCO3 or(Ca+Mg)]
Average Upstream Hardness mg/L)
[Total as, CaCO3 or(Ca+Mg)]
7Q 10 summer(cfs) 0.0 Zero flow conditions
[7Q10 and 30Q2 = 0.0 cfs
1 Q 10 (cfs) 0.0 Zero flow conditions
[7Q10 and 30Q2 = 0.0 cfs
Permitted Flow(MGD) Flow not limited Average for previous
[Greensand] permit cycle 0.042 MGD
Page 7 of 7

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AFFIDAVIT OF PUBLICATION
Account/ Order Number Identification Order PO Amount Cots Depth
19489 466308 Print Legal Ad-IPL01394800-IPLO139480 $416.44 1 1 1 41 L
Attention: Wren Thedford STATE OF NORTH CAROLINA
DEPARTMENT OF WATER RESOURCES-RALEIGH COUNTY OF WAKE,COUNTY OF DURHAM
1617 MAIL SERVICE CENTER Before the undersigned,a Notary Public of Dallas
RALEIGH,NC 276991617 County,Texas,duly commissioned and authorized to
administer oaths.affirmations,etc.,personally
[e-mail] appeared Tara Pennington,who being duly sworn or
affirmed,according to law,cloth depose and say that he
---------------------------------------------------------------------------
Public Notice or she is Accounts Receivable Specialist of the News&
North Carolina Environmental Man- Observer Publishing Company,a corporation organized
agement Cummission/NPDES Unit and doing business under the Laws of the State of North
1617 Mail Service Center
Raleigh,NC 27699-1617 Carolina,and publishing newspaper known as The
Notice of Intent to Issue a NPDES News&Observer.Wake and State aforesaid,the said
Wastewater Permit NCO087998 Rand
Meadows Phase a WTP The North newspaper in which such notice.paper,document,or
Carolina Environmental Management legal advertisement was published was,at the time of
Commission proposes to issue a NP-
DES wastewater discharge permit to each and every such publication,a newspaper meeting
the person(s) listed below. Written all of the requirements and qualifications of Section 1-
comments regarding the proposed
permit will be accepted until 30 days 597 of the General Statutes of North Carolina and was a
after the publish date of this notice. qualified newspaper within the meaning of Section 1.597
The Director of the NC Division of
Water Resources (DAR) may hold of the General Statutes of North Carolina,and that as
a public hearing should there be a significant degree of public interest. such he or she makes this affidavit;and is familiar with
Please mail comments and/or infor- the books,files and business of said corporation and by
oration requests to DNR at the above reference to the files of said publication the attached
address.Interested persons may visit
the DWR at 512 N.Salisbury Street advertisement for DEPARTMENT OF WATER RESOURCES-
Raleigh,NC 27604 to review the infor- RALEIGH was inserted in the aforesaid newspaper on
mation on file. Additional information
on NPOES permits and this notice may dates as follows:
be found on our webstle:Mtps://deq.
nc gov/public-notices-hearings,or by
calling(919)707-3601.AQUA of NC, ; 1 insertion(s)published on:
Inc.requested to renew NPDES permit 0913'23
N00087998 for the Rand Meadows
Phase II WTP,[at Ten Ten Rd&Rand
Rd.l,Wake County,discharging treat-
ed plant backwash to a Ur of Juniper
Branch,Neuse River Basin.Currently,
Total Residual Chlorine 17RC) is we-
tar-quality limited.This discharge my
affect future wasteload allocations in
this portion of the watershed.
I9480
Sep 13 202 11,.�'
certify or declare)under penalty of perjury t at t e
foregoing is true and correct.
otary u is in—and for the state of T exas,rest d ing in
Dallas County
STEPHANIE HATCHER
=•; •: Expires
My Notary IU#1335344M
Januaryr 14,2021i
Extra charge for lost or duprlmate affidavits.
Legal document please do not destroy!
1 of 1 9/19/2023, 12:37 PM

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AQUA North Carolina, Inc. Facility
Rand Meadows Phase II WTP Location
Receiving Stream:UT to Juniper Branch River Basin: Neuse (Map not to scale)
Grid/Quad: E24NW/Lake Wheeler Stream Class: C;NSW
Latitude: 350 34'59"N Subbasin: 03-04-03 NPDES Permit NCO087998
Longitude: 780 40'49"W Stream Segment: 27-43-15-10-1 North
Wake County