HomeMy WebLinkAboutNC0089656_Fact Sheet_20210428DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
DEQ / DWR /NPDES
EXPEDITED FACT SHEET -NPDES PERMIT RENEWAL
NPDES Permit NC0089656
Joe R. Co>fporon, P. G., Compliance & Expedited Permitting Unit
04Jan2021
i Table 1 - Facility Information
Applicanti acility Name
DC Charlotte Plaza LLLP - Dimensional Place
Operations:
Permanent Building Dewatering (construction now complete)
Applicant Address:
191 Peachtree Street, Suite 500, Atlanta, GA 30303
Facility Address:
1515 South Tryon Street, Charlotte, NC 28203
Permitted Flow (MGD)
0.108 MGD
Waste Character:
100% industrial, privately owned, <1.0 MGD
Facility Class:
PC-1
County:
Mecklenburg
Permit Status:
Renewal
Regional Office:
MRO
Stream Characteristics
Receiving Stream:
UT to Irwin Creek
Stream Classification:
C
Stream Segment:
11-137-1
Drainage basin:
Catawba
Summer 7Q10 (cfs):
0
Subbasin [HUC]:
03-08-32
[030501030101]
Winter 7Q10 (cfs):
0
Use Support:
Impaired for
Cu, Pb & Zn
30Q2 (cfs):
0
303(d) Listed:
Average Flow (cfs):
0
State Grid:
G15NE
IWC (%):
100%
USGS Topo Quad:
Charlotte E, NC
Draft Peer Reviewer:
Brianna Young (NPDES)
Facility Summary:
Originally, this permit facilitated excavation dewatering since discontinued (March of 2019). Renewal
therefore reflects a privately owned permanent dewatering treatment system [<1MGD] in support of a
building's subterranean parking. This permanent system utilizes:
• two (2) sumps [sub -slab dewatering drainage]
• four (4) each 1,000-pound activated carbon tanks
• one (1) bag filter
• totalizing flow meter
• effluent sample port
In addition to the above treatment, captured effluent is further treated by anAquanomics system to
produce potable water for consumption and building cooling. Considering the above bag and carbon filter
system, and the absence of TSS in past effluent, both Turbidity and TSS monitoring have been
discontinued for renewal.
Stream and Outfall 001: The dewatering and treatment facility discharges via Outfall 001 [See site
location map] discharging via storm sewer to an unnamed tributary (UT) to Irwin Creek under zero -flow
receiving -stream conditions [7Q10/30Q2 = 0.0 cfs]. Effluent limitations therefore assume an instream
waste concentration (IWC) of 100%. Irwin Creek [segment 11-137-1] is currently listed as impaired for
Copper, Lead, Zinc [2018 Integrated Report 305(b)].
Fact Sheet Jan2021
NPDES Permit NC0089656
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DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
Table 2 -- Discharge — Annual Flow Rate Summary (MGD I thru Au2020
YEAR
n
MAX
MIN
AVE
Comments
2017
305
0.0.090
0.003
0.030
2018
359
0.195
0.0001
0.028
2019
363
0.068
0.004
0.025
2020
244
0.320
0.0031
0.031
Partial year
*Flow considered for RPA = 0.040 MGD Aug2018 (highest monthly average).
Renewal Parameters of Concern (POCs): See attached RPA spread sheets for Metals and
Chlorinated hydrocarbons
Table 3 — Summary of POC database Review (results in ug/L unless otherwise stated)
[NOTE: these data in part reflect excavation dewatering discontinued in March 2019.]
PERAMETER
n
MAX
MIN
AVE
Detected
Renew�Mmit
RPA Results
PCE
42
<1
<1
<1
No
—
No RP
TCE
42
<1
<1
<1
No
—
No RP
1,1 DCE
42
2.9
0.53
1.03
3
—
No RP
1,1 DCA
42
<1
0.31
0.98
6
100/100
RP = Yes
1,2 DCA
42
1.40
0.910
1.01
4
—
No RP
Chloroform
42
3.8
<1
1.18
9
—
No RP
TSS
42
1.4
2.5
3.07
5
30/45 mg/L
Lead
42
10
<1
6.93
No
—
No RP
Copper
42
20
5.1
14.22
3
—
No RP
Zinc
42
55
3.2
37.65
15
—
No RP
O&G
42
7.4
5
5.08
3
—
—
Total
Hardness
42
190
77
136
—
—
—
EPA 624
3
2.9
0.31
1.25
1 = (1,1 DCE)
—
No RP
Epa 625
3
Semi-VOCs
No
WET Test
(TAA6C)
25
—
—
—
1 Fail / retest Pass
Discontinued as
inappropriate
for pennanent
system
—
WET Test
(TGE6C)
6
—
—
—
All pass
—
—
Fact Sheet Jan2021
NPDES Permit NC0089656
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DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
Rationale for Renewal Limits
As permitted, the treatment system anticipated serving during both building excavation/construction and
long-term building dewatering. The system design addresses both physical and chemical contaminants of
concern. The new structure's subterranean parking level was completed in March of 2019 in part finished
below the local groundwater table.
It is noteworthy that local groundwater influent to the treatment system appears stable now that construction
has been completed for approximately 21 months, according to groundwater analyses. Data reported even
during turbid excavation conditions indicate no reasonable potential for a list of contaminants of concern
(see RPAs). Therefore, as recommended by the RPA (see Table 3), renewal permit limits of these
parameters reflect "no further monitoring" [see permit section A. (1 .)].
Monitoring by broad -list tests EPA 624 and 625 are continued annually as a spot check for volatile and
semi -volatile organic compounds, and Whole Effluent Toxicity (WET) testing, Acute, remains Quarterly.
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 Ouality 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. — = 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 1.1g/1 for human health protection; cyanide at 5 µg/L and fluoride at 1.8 mg/L for aquatic life
protection).
Fact Sheet Jan2021
NPDES Permit NC0089656
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DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
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 Xd)
Metal
NC Dissolved Standard, µg/1
Cadmium, Acute
WER* {1.136672-[lnhardness](0.041838)} •e^{0.9151 [ln hardness] -
3.1485}
Cadmium, Acute Trout
waters
WER* {1.136672-[lnhardness](0.041838)}•e^{0.9151[lnhardness]-
3.6236}
Cadmium, Chronic
WER* {1.101672-[ln hardness](0.041838)} • e^{0.7998 [ln hardness]-
4.4451 }
Chromium III, Acute
WER*0.3 16 • e^{0.8190[In 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}
Lead, 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[In hardness]+2.255}
Nickel, Chronic
WER*0.997 • e^{0.8460[lnhardness]+0.0584}
Silver, Acute
WER*0. 85 • e^{1.72[lnhardness]-6.59}
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 • e^{0.8473[lnhardness]+0.884}
Zinc, Chronic
WER*0.986 • e^ {0.8473 [ln 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
Fact Sheet Jan2021
NPDES Permit NC0089656
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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, 7Q 10 (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
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 (s7Q1 0, 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 1Q10 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.
Fact Sheet Jan2021
NPDES Permit NC0089656
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EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to totalrecoverable 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:
Cdjss = 1
Ctotal 1 + { [Kpo] [SS(l+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 sheet labeled DPCs.
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 s7Q10)
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
Fact Sheet Jan2021
NPDES Permit NC0089656
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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)]
-
DMR data
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca + Mg)]
-
DMR data
7Q10 summer (cfs)
0.0
BIMS
1 Q 10 (cfs)
0.0
RPA
Permitted Flow (MGD)
0.040
Aug2018 (previous cycle highest
monthly average).
Fact Sheet Jan2021
NPDES Permit NC0089656
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2016 Generic RPA (non -hardness dependent) - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q1Ow (cfs)
30Q2 (cfs)
QA (cfs)
1Q1Os (cfs)
Data Source(s)
❑ CHECK TO APPLY MODEL
❑ CHECK IF HQW OR ORW
Dimensional Place
PC-1
NC0089656
001
0.040
UT to Irwin Creek
C
0.00
0.00
0.00
0.00
0.00
0.040 MGD = highest Monthly Average flow
(Aug2018) durning previous permit cycle [eDMRs];
used by RPA as conservative to protect the
environment.
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.
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Name
Type Chronic
Modifier Acute
PQL Units
Chloroform
C
2000
HH
1
pg/L
1,1-Dichloroethane
C
100
HH
1
pg/L
1,2-Dichloroethane
C
650
HH
1
pg/L
1,1-Dichloroethylene
NC
3200
FW
1
pg/L
1,1-Dichloroethylene
NC
20000
HH
1
pg/L
Tetrachloroethylene
C
3.3
HH
1
pg/L
Trichloroethylene
C
30
HH
1
pg/L
89656 Joe's RPA for Solvents final 12Mar2021, input
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
Chloroform
Values" then "COPY"
. Maximum data
points = 58
1,1-Dichloroethane
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 2017 < 1 0.5 Std Dev. 0.6490 1 2017 < 1000 500 Std Dev. 170.6497
2 2017 < 1 0.5 Mean 0.7857 2 2017 < 1000 500 Mean 465.1405
3 2017 < 1 0.5 C.V. 0.8261 3 2017 < 1000 500 C.V. 0.3669
4 2017 < 1 0.5 n 42 4 2017 1 1 n 42
5 2017 < 1 0.5 5 2017 < 1000 500
6 2017 < 1 0.5 Mult Factor = 1.1200 6 2017 1 1 Mult Factor = 1.0600
7 2017 < 1 0.5 Max. Value 3.8 pg/L 7 2017 < 1000 500 Max. Value 1000.0 Ng/L
8 2017 < 1 0.5 Max. Pred Cw 4.3 pg/L 8 2017 < 1000 500 Max. Pred Cw 1060.0 Ng/L
9 2017 < 1 0.5 9 2017 < 1000 500
10 2017 < 1 0.5 10 2017 < 1000 500
11 2018 < 1 0.5 11 2018 < 1000 500
12 2018 < 1 0.5 12 2018 < 1000 500
13 2018 < 1 0.5 13 2018 3 2.9
14 2018 < 1 0.5 14 2018 < 1000 500
15 2018 < 1 0.5 15 2018 < 1000 500
16 2018 < 1 0.5 16 2018 < 1000 500
17 2018 < 1 0.5 17 2018 < 1000 500
18 2018 < 1 0.5 18 2018 < 1000 500
19 2018 < 1 0.5 19 2018 < 1000 500
20 2018 < 1 0.5 20 2018 1 1
21 2018 < 1 0.5 21 2018 < 1000 500
22 2018 < 1 0.5 22 2018 < 1000 500
23 2019 3.8 3.8 23 2019 < 1000 500
24 2019 < 1 0.5 24 2019 < 1000 500
25 2019 1.3 1.3 25 2019 < 1000 500
26 2019 < 1 0.5 26 2019 < 1000 500
27 2019 < 1 0.5 27 2019 < 1000 500
28 2019 < 1 0.5 28 2019 < 1000 500
29 2019 < 1 0.5 29 2019 < 1000 500
30 2019 1.4 1.4 30 2019 < 1000 500
31 2019 1.9 1.9 31 2019 < 1000 500
32 2019 1.8 1.8 32 2019 < 1000 500
33 2019 1.6 1.6 33 2019 < 1000 500
34 2019 1.8 1.8 34 2019 530 530
35 2020 1.5 1.5 35 2020 < 1000 500
36 2020 < 1 0.5 36 2020 < 1000 500
37 2020 < 1 0.5 37 2020 < 1000 500
38 2020 < 1 0.5 38 2020 < 1000 500
39 2020 < 1 0.5 39 2020 < 1000 500
40 2020 1.4 1.4 40 2020 < 1000 500
41 2020 < 1 0.5 41 2020 < 1000 500
42 2020 < 1 0.5 42 2020 1000 1000
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
Values" then "COPY"
. Maximum data
points = 58
-1-
89656 Joe's RPA for Solvents final 12Mar2021, data
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
1,2-Dichloroethane
Date Data BDL=1/2DL Results
1 2017 < 1 0.5 Std Dev. 0.1877
2 2017 < 1 0.5 Mean 0.5500
3 2017 < 1 0.5 C.V. 0.3413
4 2017 < 1 0.5 n 42
5 2017 < 1 0.5
6 2017 < 1 0.5 Mult Factor = 1.0500
7 2017 < 1 0.5 Max. Value 1.4 pg/L
8 2017 < 1 0.5 Max. Pred Cw 1.5 pg/L
9 2017 < 1 0.5
10 2017 < 1 0.5
11 2018 1.4 1.4
12 2018 < 1 0.5
13 2018 < 1 0.5
14 2018 < 1 0.5
15 2018 < 1 0.5
16 2018 < 1 0.5
17 2018 < 1 0.5
18 2018 < 1 0.5
19 2018 < 1 0.5
20 2018 < 1 0.5
21 2018 < 1 0.5
22 2018 < 1 0.5
23 2019 < 1 0.5
24 2019 < 1 0.5
25 2019 < 1 0.5
26 2019 < 1 0.5
27 2019 < 1 0.5
28 2019 < 1 0.5
29 2019 < 1 0.5
30 2019 < 1 0.5
31 2019 < 1 0.5
32 2019 1.2 1.2
33 2019 < 1 0.5
34 2019 0.91 0.5
35 2020 < 1 0.5
36 2020 < 1 0.5
37 2020 < 1 0.5
38 2020 < 1 0.5
39 2020 < 1 0.5
40 2020 < 1 0.5
41 2020 < 1 0.5
42 2020 1 1
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Values" then "COPY"
. Maximum data
points = 58
1,1-Dichloroethylene
Date Data BDL=1/2DL Results
1 2017 < 1 0.5 Std Dev. 0.3764
2 2017 < 1 0.5 Mean 0.5690
3 2017 < 1 0.5 C.V. 0.6615
4 2017 < 1 0.5 n 42
5 2017 < 1 0.5
6 2017 < 1 0.5 Mult Factor = 1.1000
7 2017 < 1 0.5 Max. Value 2.9 pg/L
8 2017 < 1 0.5 Max. Pred Cw 3.2 pg/L
9 2017 < 1 0.5
10 2017 < 1 0.5
11 2018 < 1 0.5
12 2018 < 1 0.5
13 2018 2.9 2.9
14 2018 < 1 0.5
15 2018 < 1 0.5
16 2018 < 1 0.5
17 2018 < 1 0.5
18 2018 < 1 0.5
19 2018 < 1 0.5
20 2018 < 1 0.5
21 2018 < 1 0.5
22 2018 < 1 0.5
23 2019 < 1 0.5
24 2019 < 1 0.5
25 2019 < 1 0.5
26 2019 < 1 0.5
27 2019 < 1 0.5
28 2019 < 1 0.5
29 2019 < 1 0.5
30 2019 < 1 0.5
31 2019 < 1 0.5
32 2019 < 1 0.5
33 2019 < 1 0.5
34 2019 0.53 0.5
35 2020 < 1 0.5
36 2020 < 1 0.5
37 2020 < 1 0.5
38 2020 < 1 0.5
39 2020 < 1 0.5
40 2020 < 1 0.5
41 2020 < 1 0.5
42 2020 1 1
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Values" then "COPY"
. Maximum data
points = 58
89656 Joe's RPA for Solvents final 12Mar2021, data
- 2 - 3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
1,1-Dichloroethylene
Date Data BDL=1/2DL Results
1 2017 < 1 0.5 Std Dev.
2 2017 < 1 0.5 Mean
3 2017 < 1 0.5 C.V.
4 2017 < 1 0.5 n
5 2017 < 1 0.5
6 2017 < 1 0.5 Mult Factor =
7 2017 < 1 0.5 Max. Value
8 2017 < 1 0.5 Max. Pred Cw
9 2017 < 1 0.5
10 2017 < 1 0.5
11 2018 < 1 0.5
12 2018 < 1 0.5
13 2018 2.9 2.9
14 2018 < 1 0.5
15 2018 < 1 0.5
16 2018 < 1 0.5
17 2018 < 1 0.5
18 2018 < 1 0.5
19 2018 < 1 0.5
20 2018 < 1 0.5
21 2018 < 1 0.5
22 2018 < 1 0.5
23 2019 < 1 0.5
24 2019 < 1 0.5
25 2019 < 1 0.5
26 2019 < 1 0.5
27 2019 < 1 0.5
28 2019 < 1 0.5
29 2019 < 1 0.5
30 2019 < 1 0.5
31 2019 < 1 0.5
32 2019 < 1 0.5
33 2019 < 1 0.5
34 2019 0.53 0.5
35 2020 < 1 0.5
36 2020 < 1 0.5
37 2020 < 1 0.5
38 2020 < 1 0.5
39 2020 < 1 0.5
40 2020 < 1 0.5
41 2020 < 1 0.5
42 2020 1 1
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Values" then "COPY"
. Maximum data
points = 58
0.3764
0.5690
0.6615
42
1.1000
2.9 pg/L
3.2 Ng/L
Tetrachloroethylene
Date Data BDL=1/2DL Results
1 2017 < 1 0.5 Std Dev. 0.0000
2 2017 < 1 0.5 Mean 0.5000
3 2017 < 1 0.5 C.V. 0.0000
4 2017 < 1 0.5 n 42
5 2017 < 1 0.5
6 2017 < 1 0.5 Mult Factor = 1.0000
7 2017 < 1 0.5 Max. Value 0.5 pg/L
8 2017 < 1 0.5 Max. Pred Cw 0 DETECTS pg/L
9 2017 < 1 0.5
10 2017 < 1 0.5
11 2018 < 1 0.5
12 2018 < 1 0.5
13 2018 < 1 0.5
14 2018 < 1 0.5
15 2018 < 1 0.5
16 2018 < 1 0.5
17 2018 < 1 0.5
18 2018 < 1 0.5
19 2018 < 1 0.5
20 2018 < 1 0.5
21 2018 < 1 0.5
22 2018 < 1 0.5
23 2019 < 1 0.5
24 2019 < 1 0.5
25 2019 < 1 0.5
26 2019 < 1 0.5
27 2019 < 1 0.5
28 2019 < 1 0.5
29 2019 < 1 0.5
30 2019 < 1 0.5
31 2019 < 1 0.5
32 2019 < 1 0.5
33 2019 < 1 0.5
34 2019 < 1 0.5
35 2020 < 1 0.5
36 2020 < 1 0.5
37 2020 < 1 0.5
38 2020 < 1 0.5
39 2020 < 1 0.5
40 2020 < 1 0.5
41 2020 < 1 0.5
42 2020 < 1 0.5
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Values" then "COPY"
. Maximum data
points = 58
89656 Joe's RPA for Solvents final 12Mar2021, data
- 3 - 3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
Trichloroethylene
Date Data BDL=1/2DL Results
1 2017 < 1 0.5 Std Dev. 0.0000
2 2017 < 1 0.5 Mean 0.5000
3 2017 < 1 0.5 C.V. 0.0000
4 2017 < 1 0.5 n 42
5 2017 < 1 0.5
6 2017 < 1 0.5 Mult Factor = 1.0000
7 2017 < 1 0.5 Max. Value 0.5 pg/L
8 2017 < 1 0.5 Max. Pred Cw 0 DETECTS pg/L
9 2017 < 1 0.5
10 2017 < 1 0.5
11 2018 < 1 0.5
12 2018 < 1 0.5
13 2018 < 1 0.5
14 2018 < 1 0.5
15 2018 < 1 0.5
16 2018 < 1 0.5
17 2018 < 1 0.5
18 2018 < 1 0.5
19 2018 < 1 0.5
20 2018 < 1 0.5
21 2018 < 1 0.5
22 2018 < 1 0.5
23 2019 < 1 0.5
24 2019 < 1 0.5
25 2019 < 1 0.5
26 2019 < 1 0.5
27 2019 < 1 0.5
28 2019 < 1 0.5
29 2019 < 1 0.5
30 2019 < 1 0.5
31 2019 < 1 0.5
32 2019 < 1 0.5
33 2019 < 1 0.5
34 2019 < 1 0.5
35 2020 < 1 0.5
36 2020 < 1 0.5
37 2020 < 1 0.5
38 2020 < 1 0.5
39 2020 < 1 0.5
40 2020 < 1 0.5
41 2020 < 1 0.5
42 2020 < 1 0.5
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Values" then "COPY"
. Maximum data
points = 58
89656 Joe's RPA for Solvents final 12Mar2021, data
- 4 - 3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
Dimensional Place REASONABLE POTENTIAL ANALYSIS
NC0089656
Qw (MGD) = 0.04000
1Q10S (cfs) = 0.00
7Q1OS (cfs) = 0.00
7Q1OW (cfs) = 0.00
30Q2 (cfs) = 0.00
Avg. Stream Flow, QA (cfs) = 0.00
Receiving Stream: UT to Irwin Creek
2016 Generic RPA (non -hardness dependent) - 95% Probability/95% Confidence
MAXIMUM DATA POINTS = 58
WWTP/WTP Class: PC-1
IWC @ 1Q10S = 100.0%
IWC @ 7Q1OS = 100.0%
IWC@7Q1OW= 100.0%
IWC@30Q2= 100.0%
IWC @ QA = 100.0%
Stream Class: C
Outfall 001
Qw = 0.04 MGD
PARAMETER
TYPE
(q)
STANDARDS & CRITERIA (2)
J
a
n
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS / Applied Y2 FAV /
Chronic Standard Acute
n # Det. Max Pred Cw Allowable Cw
Chloroform
C
2000 HH
1
µg/L
42 9
4.3
Acute: NO WQS
_ _ _ ---- _ _ --
Chronic:2,000
No value > Allowable Cw
---------------------------
No RP; discontinue Monitoring
1,1-Dichloroethane
C
100 HH
1
µg/L
42 6
1060
Acute: NO WQS
_
Chronic 100
38 value(s) > Allowable Cw
RP = Yes. apply Monthly Monitoring, Pollutant of
concern
1,2-Dichloroethane
C
650 HH
1
µg/L
42 4
1.5•
Acute: NO WQS
_ _ _ —650 ------------------------------
No value > Allowable Cw
No RP; discontinue Monitoring
1,1-Dichloroethylene
NC
3200 FW
1
µg/L
42 3
3.2
Acute: NO WQS
_ _ _ ---- _ _ -----------------------------
Chronic:3,200
No value > Allowable Cw
No RP; discontinue Monitoring
1,1-Dichloroethylene
NC
20000 1111
1
µg/L
42 3
3.2
Acute: NO WQS
_ _ _ ---- _ _ _
Chronic:20,000
No value > Allowable Cw
------
No RP; discontinue Monitoring
Tetrachloroethylene
C
3.3 HH
1
pg/L
42 0
NO DETECTS
Acute: NO WQS
_
Chronic 3.30
Max MDL = 1
No RP; discontinue Monitoring
Trichloroethylene
C
30 HH
1
pg/L
42 0
NO DETECTS
Acute: NO WQS
_ _ _ ___________
Chronic: 30
Max MDL = 1
_ _ _ _ _ _ ____________
No RP; discontinue Monitoring
Page 1 of 1
89656 Joe's RPA for Solvents final 12Mar2021, rpa
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
DC Charlotte Plaza LLLP - Dimensional Place
PC-1
NC0089656
001
0.040
UT to Irwin Creek
030501030101
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
0.00
0.00
0.00
0.00
0.00
Effluent Hardness
136.12 mg/L (Avg)
Upstream Hardness
25 mg/L (Avg)
Combined Hardness Chronic
Combined Hardness Acute
136.12 mg/L
136.12 mg/L
Data Source(s)
CHECK TO APPLY MODEL
0.040 MGD = highest Monthly Average flow
(Aug2018) durning previous permit cycle [eDMRs];
conservative to protect the environment. Upsteam
hardness assumed 25 mg/L [no data; zero -flow
stream conditions]
CHECK WQS
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Name
WQS
Type
Chronic Modifier
Acute
PQL Units
4
Copper
Aquatic Life
NC
33.5317
FW
51.6974
ug/L
Lead
Aquatic Life
NC
19.1125
FW
490.4600
ug/L
Zinc
Aquatic Life
NC
532.7044
FW
528.3822
ug/L
89656 Joe's RPA for metals final 12Mar2021, input
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
89656 Joe's RPA for metals final 12Mar2021, input
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
H1
Effluent Hardness
Date Data BDL=1/2DL Results
1 2017 130 130 Std Dev.
2 2017 130 130 Mean
3 2017 140 140 C.V.
4 2017 140 140 n
5 2017 120 120 10th Per value
6 2017 110 110 Average Value
7 2017 140 140 Max. Value
8 2017 77 77
9 2017 160 160
10 2017 150 150
11 2018 140 140
12 2018 150 150
13 2018 120 120
14 2018 140 140
15 2018 150 150
16 2018 150 150
17 2018 150 150
18 2018 140 140
19 2018 160 160
20 2018 150 150
21 2018 150 150
22 2018 190 190
23 2019 130 130
24 2019 100 100
25 2019 130 130
26 2019 130 130
27 2019 130 130
28 2019 140 140
29 2019 130 130
30 2019 150 150
31 2019 140 140
32 2019 120 120
33 2019 130 130
34 2019 130 130
35 2020 130 130
36 2020 130 130
37 2020 130 130
38 2020 130 130
39 2020 140 140
40 2020 140 140
41 2020 140 140
42 2020 130 130
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE SPECIAL.
values" then "COPY"
. Maximum data
points = 58
17.4862
136.1190
0.1285
42
120.00 mg/L
136.12 mg/L
190.00 mg/L
H2
Upstream Hardness
Date Data BDL=I/2DL Results
1 25 25 Std Dev. N/A
2 Mean 25.0000
3 C.V. 0.0000
4 n 1
5 10th Per value 25.00 mg/L
6 Average Value 25.00 mg/L
7 Max. Value 25.00 mg/L
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL•
Values" then "COPY"
. Maximum data
points = 58
-1-
89656 Joe's RPA for metals final 12Mar2021, data
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
Pal
Copper
Date Data BDL=1/2DL Results
1 2017 < 10 5 Std Dev.
2 2017 < 10 5 Mean
3 2017 < 10 5 C.V.
4 2017 < 10 5 n
5 2017 < 10 5
6 2017 < 10 5 Mult Factor =
7 2017 < 10 5 Max. Value
8 2017 5.1 5.1 Max. Pred Cw
9 2017 < 10 5
10 2017 < 10 5
11 2018 < 10 5
12 2018 < 10 5
13 2018 < 10 5
14 2018 < 10 5
15 2018 < 10 5
16 2018 20 20
17 2018 < 10 5
18 2018 < 10 5
19 2018 < 10 5
20 2018 < 10 5
21 2018 < 10 5
22 2018 < 10 5
23 2019 12 12
24 2019 < 10 5
25 2019 < 10 5
26 2019 < 20 10
27 2019 < 20 10
28 2019 < 20 10
29 2019 < 20 10
30 2019 < 20 10
31 2019 < 20 10
32 2019 < 20 10
33 2019 < 20 10
34 2019 < 20 10
35 2020 < 20 10
36 2020 < 20 10
37 2020 < 20 10
38 2020 < 20 10
39 2020 < 20 10
40 2020 < 20 10
41 2020 < 20 10
42 2020 < 20 10
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use"PASTE SPECIAL.
values" then "COPY"
. Maximum data
points = 58
Par14
Lead
3.2230
7.5500
0.4269
42
1.07
20.00 ug/L
21.40 ug/L
Date BDL=I/2DL Results
1 2017 < 5 2.5 Std Dev.
2 2017 < 5 2.5 Mean
3 2017 < 5 2.5 C.V.
4 2017 < 5 2.5 n
5 2017 < 5 2.5
6 2017 < 5 2.5
7 2017 < 5 2.5
8 2017 < 1 0.5
9 2017 < 5 2.5
10 2017 < 5 2.5
11 2018 < 5 2.5
12 2018 < 5 2.5
13 2018 < 5 2.5
14 2018 < 5 2.5
15 2018 < 5 2.5
16 2018 < 5 2.5
17 2018 < 5 2.5
18 2018 < 5 2.5
19 2018 < 5 2.5
20 2018 < 5 2.5
21 2018 < 5 2.5
22 2018 < 5 2.5
23 2019 < 5 2.5
24 2019 < 5 2.5
25 2019 < 5 2.5
26 2019 < 10 5
27 2019 < 10 5
28 2019 < 10 5
29 2019 < 10 5
30 2019 < 10 5
31 2019 < 10 5
32 2019 < 10 5
33 2019 < 10 5
34 2019 < 10 5
35 2020 < 10 5
36 2020 < 10 5
37 2020 < 10 5
38 2020 < 10 5
39 2020 < 10 5
40 2020 < 10 5
41 2020 < 10 5
42 2020 < 10 5
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL•
Values" then "COPY"
. Maximum data
points = 58
1.3178
3.4643
0.3804
42
Mult Factor = 1.06
Max. Value 5.000 ug/L
Max. Pred Cw 0 DETECTS ug/L
-2-
89656 Joe's RPA for metals final 12Mar2021, data
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date
1 2017
2 2017
3 2017
4 2017
5 2017
6 2017
7 2017
8 2017
9 2017
2017
2018
2018
2018
2018
2018
2018
2018
2018
2018
2018
2018
2018
2019
2019
2019
2019
2019
2019
2019
2019
2019
2019
2019
2019
2020
2020
2020
2020
2020
2020
2020
2020
Data
30
30
30
30
30
30
37
23
36
30
3.2
4.3
49
30
30
45
44
51
43
5.9
30
30
44
36
50
50
50
50
5
55
50
50
50
50
50
50
50
50
50
50
50
50
BDL=1/2DL
15
15
15
15
15
15
37
23
36
15
3.2
4.3
49
15
15
45
44
51
43
5.9
15
15
44
36
50
25
25
25
2.5
55
25
25
25
25
25
25
25
25
25
25
25
25
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use"PASTE SPECIAL•
values" then "COPY"
. Maximum data
points = 58
13.5064
25.4500
0.5307
42
1.08
55.0 ug/L
59.4 ug/L
89656 Joe's RPA for metals final 12Mar2021, data
- 3 - 3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
DC Charlotte Plaza LLLP - Dimensional Place
NC0089656
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) = 0.04
1Q1OS (cfs) = 0.00
7Q1OS (cfs) = 0.00
7Q1OW (cfs) = 0.00
30Q2 (cfs) = 0.00
Avg. Stream Flow, QA (cfs) = 0.00
Receiving Stream: UT to Irwin Creek HUC 030501030101
WWTP/WTP Class: PC-1
IWC% @ 1Q1OS = 100
IWC% @ 7Q1OS = 100
IWC% @ 7Q1OW = 100
IWC% @ 30Q2 = 100
IW%C@QA= 100
Stream Class: C
Outfall 001
Qw = 0.04 MGD
COMBINED HARDNESS (mg/L)
Acute =136.12 mg/L
Chronic = 136.12 mg/L
PARAMETER
TYPE
(1)
NC STANDARDS OR EPA CRITERIAco
Ci
°
i_
D
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
Chronic
Applied
Standard
_
Acute
n
# Det. Max Pred Cw Allowable Cw
Copper
NC
33.5317
FW
51.6974
ug/L
42
3
21
Acute: 52
No RP -discontinue monitoring
Chronic: 34
No value > Allowable Cw
No RP - discontinue monitoring
Lead
NC
19.1125
FW
490.4600
ug/L
42
0
NO DETECTS
Acute: 490
No RP - discontinue monitoring
_ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 19
Max MDL = 10
No RP - discontinue monitoring
Zinc
NC
532.7044
FW
528.3822
ug/L
42
15
59
Acute: 528
No RP - discontinue monitoring
_ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 533
No value > Allowable Cw
No RP - discontinue monitoring
Page 1 of 1
89656 Joe's RPA for metals final 12Mar2021, rpa
3/12/2021
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES Permit NC0089656
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions 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,
DC Charlotte Plaza LLLP
is hereby authorized to discharge wastewater from a facility located at the
Dimensional Place - Groundwater Remediation (GW-REM)
1515 South Tryon Street, Charlotte 28203
Mecklenburg County
to receiving waters designated as an unnamed tributary to Irwin Creek in the Catawba River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III, and IV hereof.
The permit shall become effective March 1, 2017.
This permit and the authorization to discharge shall expire at midnight on June 30, 2020.
Signed this day March 1, 2017.
S. Jay Zimmerman, P.G., Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES PermitNC0089656
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this 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 described herein.
DC Charlotte Plaza LLLP
is hereby authorized to:
1. begin operating a 0.108 MGD dewatering and groundwater remediation system consisting of, but not
limited to;
• a temporary dewatering and groundwater remediation system for during construction
consisting of;
o thirty-four (34) recovery wells
o three (3) 1,000-gallon transfer tanks
o a trailer -mounted treatment with two (2) 2,000-pound activated carbon tanks
o a bag filter
o a flow totalizer
o an effluent sample port
• a permanent dewatering and groundwater remediation system for post construction
consisting of;
o a sub -slab dewatering drainage system draining to two (2) sumps
o sump pumps
o four (4) 1,000-pound activated carbon tanks
o a bag filter
o flow totalizer
o an effluent sample port
located at Dimensional Place, 1515 South Tryon Street, Charlotte, Mecklenburg County; and
2. discharge from said treatment works via Outfall 001 at a location specified on the attached map, into
an unnamed tributary to Irwin Creek [Stream Segment 11-137-1], currently a Class C waterbody
within Subbasin 03-08-34 [HUC: 030501030101] of the Catawba River Basin.
Page 2 of 11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES PermitNC0089656
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 construction phase is
completed, the Permittee is authorized to discharge via Outfall 001. Such discharges shall be limited,
monitored and reported' by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
[Parameter Code]
LIMITS
MONITORING REQUIREMENTS 1
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations 2'3
Flow (MGD)
50050
0.108 MGD
Continuous
Recording
E
Total Suspended Solids (TSS)
C0530
30.0 mg/L
45.0 mg/L
Per Batch 5 or
Monthly
Grab
E
Turbidity (NTU) 4
00070
50 NTU
50 NTU
Per Batch 5 or
Monthly
Grab
E
pH (su)
00400
> 6.0 and < 9.0 standard units
Per Batch 5 or
Monthly
Grab
E
1,1 Dichloroethane (µg/L) 6
34496
100 µg/L
100 µg/L
Per Batch 2'5 or
Monthly
Grab
I & E
1,1 Dichloroethylene (mg/L) 6
34501
1.5 mg/L
1.5 mg/L
Per Batch2'5 or
Monthly
Grab
I & E
1,2 Dichloroethane (µg/L) 6
32103
37 µg/L
37 µg/L
Per Batch2'5 or
Monthly
Grab
I & E
Chloroform (µg/L) 6
32106
170 µg/L
170 µg/L
Per Batch 'S or
Monthly
Grab
I & E
Tetra chloroethylene (µg/L) 6
78389
3.3 µg/L
3.3 µg/L
Per Batch's or
Monthly
Grab
I & E
Trichloroethylene (µg/L) 6
7839/
3 µg/L
3 µg/L
Per Batch2'5 or
Monthly
Grab
I & E
Oil and Grease (mg/L)
[EPA Method 1664 SGT-HEM]
00556
Per Batch 5 or
Monthly
Grab
E
TotalCopper (µg/L) 6'7
01042
Per Batch 5'7 or
Monthly
Grab
E
TotalLead (µg/L) 6'7
01051
Per Batch 5'7 or
Monthly
Grab
E
Total Zinc (µg/L) 6'7
01092
Per Batch 5'7 or
Monthly
Grab
E
TotalHardness (as CaCO3)(mg/L)7
00900
Per Batch 5'7 or
Monthly
Grab
E
Acute Whole Effluent Toxicity 8
TAA6C
Monthly
Grab
E
Organics, TotalPurgeables (VOCs)
(EPA Method 624) (µg/L) 6,9
76029
Annually
Grab
E
Base Neutrals & Acids (Semi-VOCs)
(EPA Method 625) (µg/L) 6'9
76028
Annually
Grab
E
Footnotes: See next page
Page 3of11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES Permit NC0089656
Footnotes:
1. Effective December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC
DWR's eDMR application system. See Condition A. (5.).
2. I = Internal Sampling, Location and Frequency: Prior to each carbon -filter change -out, the Permittee shall
collect Internal samples immediately upstream of the final carbon -filter in order to document contaminant
"break -through" of the next -to last carbon -filter. Internal samples shall be collected at minimum Monthly, or
at a frequency matching or exceeding system -design expected filter saturation [break -through], herein defined
as a Batch (see Treatment Batch), whichever is more frequent.
3. Sample Location: E = Effluent: In order to document that contaminants have not reached the environment;
effluent samples shall be collected concurrently with break -through Internal samples. Effluent samples shall
be collected immediately after the last carbon filter designated as final treatment before storm -drain discharge.
4. Turbidity: Effluent turbidity shall not cause receiving -stream turbidity to exceed 50 NTU. If background
turbidity naturally exceeds 50 NTU, the effluent shall not cause background turbidity to increase. Any
discharge exceeding this permit limit will require sufficient instream sampling (upstream and/or downstream)
to verify compliance (effluent vs. background). [NCAC 02B. 0211(21)]
5. Treatment Batch - Batch Discharge Logs: A treatment Batch is defined as the useable life of a carbon filter,
from the time of first installation to change -out. The permittee shall document total flow to each designated
outfall; effluent discharge logs shall document Batch filter change -out to include, date, time, and total
effluent flow. Copies of these logs shall be kept onsite for the duration of the project, at all times available for
DWR inspection.
6. All practical quantitation limits (PQL) must be sufficiently sensitive to accommodate the respective water
quality standard for each parameter [see Part II. Section D. (4.)].
7. After securing a minimum of 12 sample analyses (sampling no more frequently than 2/month), the Permittee
may submit a written request for the Division to reevaluate monitoring conditions and effluent limitations.
8. Whole Effluent Toxicity (WET): Acute, Monitor Only; Monthly (Pimephales promelas) 48-hour static test.
[See Section A. (3)].
9. For the eDMR application system, any detections shall be reported by entering "1" [Yes (Y) =1] and no
detection shall be reported by entering "0" [NO (N) = 0]. Any detections for Total Purgeables Organics (EPA
Method 624) or Base Neutrals & Acids (EPA Method 625) shall be noted in the comments section by noting
the compound detected and reported concentration. Laboratory reports shall be kept on file in accordance with
records retention requirements found in Part II. Section D. 6.
Conditions:
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
• Discharge shall show no evidence as a source for oily film or sheen on the receiving stream.
Page 4of11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES PermitNC0089656
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon post construction and lasting until expiration, the Permittee is
authorized to discharge via Outfa11001. Such discharges shall be limited, monitored and reported' by the
Permittee as specified below:
EFFLUENT CHARACTERISTICS
[Parameter Code]
LIMITS
MONITORING REQUIREMENTS 1
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations 2'3
Flow (MGD)
50050
0.108 MGD
Continuous
Recording 1
E
Total Suspended Solids (TSS)
C0530
30.0 mg/L
45.0 mg/L
Per Batch 5 or
Monthly
Grab
E
Turbidity (NTU) 4
00070
50 NTU
50 NTU
Per Batch 5 or
Monthly
Grab
E
pH (su)
00400
> 6.0 and < 9.0 standard units
Per Batch 5 or
Monthly
Grab
E
1,1 Dichloroethane (µg/L) 6
34496
100 µg/L
100 µg/L
Per Batch 2'5 or
Monthly
Grab
I & E
1,1 Dichloroethylene (mg/L) 6
34501
1.5 mg/L
1.5 mg/L
Per Batch2,5 or
Monthly
Grab
I & E
1,2 Dichloroethane (µg/L) 6
32103
37 µg/L
37 µg/L
Per Batch2'5 or
Monthly
Grab
I & E
Chloroform (µg/L) 6
32106
170 µg/L
170 µg/L
Per Batch 'S or
Monthly
Grab
I & E
Tetrachloroethylene (µg/L) 6
78389
3.3 µg/L
3.3 µg/L
Per Batch2'5 or
Monthly
Grab
I & E
Trichloroethylene (µg/L) 6
78391
3 µg/L
3 µg/L
Per Batch2'5 or
Monthly
Grab
I & E
Oil and Grease (mg/L)
[EPA Method 1664 SGT-HEM]
00556
Per Batch 5 or
Monthly
Grab
E
TotalCopper (µg/L) 6'7
01042
Per Batch 5'7 or
Monthly
Grab
E
TotalLead (µg/L) 6'7
01051
Per Batch 5'7 or
Monthly
Grab
E
TotalZinc (µg/L) 6'7
01092
Per Batch 5'7 or
Monthly
Grab
E
TotalHardness (as CaCO3)(mg/L)7
00900
Per Batch 5'7 or
Monthly
Grab
E
Acute Whole Effluent Toxicity 8
TGE6C
Quarterly
Grab
E
Organics, TotalPurgeables (VOCs)
6 9
(EPA Method 624) (µg/L) '
76029
Annually
Grab
E
Base Neutrals & Acids (Semi-VOCs)
6 9
(EPA Method 625) (µg/L) '
76028
Annually
Grab
E
Footnotes:
1. Effective December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC
DWR's eDMR application system. See Condition A. (5.).
Page 5 of 11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES Permit NC0089656
2. I = Internal Sampling, Location and Frequency: Prior to each carbon -filter change -out, the Permittee shall
collect Internal samples immediately upstream of the final carbon -filter in order to document contaminant
"break -through" of the next -to last carbon -filter. Internal samples shall be collected at minimum Monthly, or
at a frequency matching or exceeding system -design expected filter saturation [break -through], herein defined
as a Batch (see Treatment Batch), whichever is more frequent.
3. Sample Location: E = Effluent: In order to document that contaminants have not reached the environment;
effluent samples shall be collected concurrently with break -through Internal samples. Effluent samples shall
be collected immediately after the last carbon filter designated as final treatment before storm -drain discharge.
4. Turbidity: Effluent turbidity shall not cause receiving -stream turbidity to exceed 50 NTU. If background
turbidity naturally exceeds 50 NTU, the effluent shall not cause background turbidity to increase. Any
discharge exceeding this permit limit will require sufficient instream sampling (upstream and/or downstream)
to verify compliance (effluent vs. background). [NCAC 02B. 0211(21)]
5. Treatment Batch - Batch Discharge Logs: A treatment Batch is defined as the useable life of a carbon filter,
from the time of first installation to change -out. The permittee shall document total flow to each designated
outfall; effluent discharge logs shall document Batch filter change -out to include, date, time, and total
effluent flow. Copies of these logs shall be kept onsite for the duration of the project, at all times available for
DWR inspection.
6. All practical quantitation limits (PQL) must be sufficiently sensitive to accommodate the respective water
quality standard for each parameter [see Part II. Section D. (4.)].
7. After securing a minimum of 12 sample analyses (sampling no more frequently than 2/month), the Permittee
may submit a written request for the Division to reevaluate monitoring conditions and effluent limitations.
8. Whole Effluent Toxicity (WET): Acute, pass/fail; Quarterly (Pimephales promelas) 24-hour static test at 90%
effluent concentration, during January, April, July and October [See Section A. (4)].
9. For the eDMR application system, any detections shall be reported by entering"1" [Yes (Y) =1] and no
detection shall be reported by entering "0" [NO (N) = 0]. Any detections for Total Purgeables Organics (EPA
Method 624) or Base Neutrals & Acids (EPA Method 625) shall be noted in the comments section by noting
the compound detected and reported concentration. Laboratory reports shall be kept on file in accordance with
records retention requirements found in Part II. Section D. 6.
Conditions:
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
• Discharge shall show no evidence as a source for oily film or sheen on the receiving stream.
Page 6 of 11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES PermitNC0089656
A. (3.) ACUTE TOXICITY MONTHLY - MONITOR ONLY
[15ANCAC 02B .0200et seq.]
The permittee shall conduct acute toxicity tests on a monthly basis using protocols defined as definitive in EPA
Document EPA-821-R-02-012 entitled "Methods for Measuring the Acute Toxicity of Effluents and Receiving
Waters to Freshwater and Marine Organisms." The monitoring shall be performed as a Fathead Minnow
(Pimephalespromelas) 48-hour static test. Effluent samples for self -monitoring purposes must be obtained
during representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all waste treatment processes.
The parameter code for Pimephalespromelas is TAA6C. 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-1 (original) is to be sent to the following
address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina27699-1621
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 any test data from either these monitoring requirements or tests performed 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.
Page 7of11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES PermitNC0089656
A. (4.) ACUTE TOXICITY PASS/FAIL MONITORING (QUARTERLY)
[15ANCAC 02B .0200et 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 processes.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring
will begin immediately until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the months specified above.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGE6C.
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
1621 Mail Service Center
Raleigh, North Carolina27699-1621
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 a month in which toxicity monitoring is required,
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 until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the months specified above. Assessment of toxicity compliance is based on
the toxicity testing quarter, which is the three month time interval that begins on the first day of the month in
which toxicity testing is required by this permit and continues until the final day of the third month.
Should any test data from either these monitoring requirements or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may b e 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.
Page 8of11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES Permit NC0089656
A. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports and specify that, if a state does not establish a system to receive such submittals, then permittees
must submit monitoring data and reports electronically to the Environmental Protection Agency (EPA).
The final NPDES Electronic Reporting Rule was adopted and became effective on December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDESPermits):
• Section B. (11.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
Effective December 21, 2016, the permittee shall report 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 / Division of Water Resources / Water Quality Permitting Section
A 11ENTION: Central Files
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. See "How to Request a Waiver from Electronic Reporting" section below.
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.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Page 9 of 11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES Permit NC0089656
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 3 16(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at: http://www2.epa.gov/compliance/final-national-pollutant-
d ischarge-elimination-system-npd es -electronic -repo rting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to
the Division. Requests for temporary electronic reporting waivers 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 submitting monitoring data and reports. The duration of a
temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data
and reports shall be submitted electronically to the Division unless the permittee re -applies for and is
granted a new temporary electronic reporting waiver by the Division. Approved electronic reporting
waivers are not transferrable. Only permittees with an approved reporting waiver request may submit
monitoring data and reports on paper to the Division for the period that the approved reporting
waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 10of11
DocuSign Envelope ID: 2FA56713-BCA3-4388-85EC-2F57769D032A
NPDES PermitNC0089656
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
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://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
"I certf, 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."
5. Records Retention [Supplements Section D. (6.)1
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].
Page 11 of 11