NC0089729_Fact Sheet_20180816

DEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT DEVELOPMENT
NPDES Permit NCO089729
Derek Denard, Compliance & Expedited Permittine Unit / 919-807-6307 16Aug2018
Facility Information
Applicant/Facility Name
City of Charlotte
Myrtle/Morehead Storm Drainage Improvement
Applicant Address
600 East Fourth St., Charlotte, NC 28202
area between South Bld., South Caldwell St., Templeton Ave.,
Facility Address
Euclid Ave., Rensselear Ave., and Cleveland Ave.,
in Charlotte, NC 28203
Permitted Flow (MGD)
0.050 MGD
Type of Waste
100% industrial, groundwater remediation/dewatering,
privately owned, <1.0 MGD
Facility Class
PC -1
County Mecklenburg
Permit Status
New
Regional Office MRO
Stream Characteristics
Receiving Stream UT to the Sugar Creek Stream Classification C
Stream Segment 11-137-8 Drainage basin Catawba
Summer 7Q10 (cfs)
0
Subbasin [HUC]
03-08-34
0
Use Support
[030501 301021.
Impaired (Cat 5):
Cu
Winter 7Q10 (cfs)
30Q2 (cfs)
0
303(d) Listed
Average Flow (cfs)
0
State Grid
G15NE
IWC (%)
100%
USGS Topo Quad
Charlotte E, NC
FacMtN Summary: This permit is for a publicly owned treatment system with 100% industrial wastewater
that is <1MGD. The permit authorizes the City of Charlotte to begin operating a 0.050 MGD dewatering
and groundwater remediation system that includes the following components;
• groundwater trenching project
• a weir / equalization tank (as needed)
• a holding / settling tank
• two (2) bag filters in parallel for sediment to remove sediment
• an air stripper with four (4) trays, a rate 50 gpm, air max @350 cfm; Carbonair STAT 80 or
equivalent
• two (2) bags filters in parallel following the air stripper
• transfer pumps and appurtenances
• discharge outfalls to stormwater drains
The Mowing chanes have been made for the final permit:
• The 15A NCAC 02B standard for Trichloroethylene is 30 gg/l. The limit of 3 µg/1 was a type -0.
The monthly average and daily maximum limit has been corrected to the water quality standard.
Fact Sheet
NPDES Permit NCO089729
Page 1

The facility classification has been added to the effluent page Part I, Section A. (1.). In accordance
with 15A NCAC 08G .0302, the facility has been classified as a Grade I Physical Chemical Water
Pollution Control System.
Additional VOCs have been added for the final permit with monthly effluent monitoring. These
parameters were detected in groundwater data submitted with the application. Therefore,
monitoring and limitation is required as follows [see Part I, Section A. (1.)]:
Toluene
34010
11 fL
11
Iso ro lbenzene L
77223
250
250
/L
ii -Bu lbenzene L
77342
3.9 L
3.9
1L
n -Pro lbenzene L
77224
80 L
80
L
1,2,3-Trichloro ro ane L
77443
0.001 ggfL
0.001
!L
-Iso ro ltoluene
03908
320
320
/L
2-Chlorotoluene L
38681
Monitor
& Repoli
Sec -But lbenzene L
77350
Monitor & Report
RPA: Reasonable Potential Analysis (RPA) - RPA was not conducted because there is no database to date
other than untreated groundwater samples collected sporadically during initial site assessment(s).
Electronic Reporting: Effective December 21, 2016, 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 final NPDES Electronic Reporting Rule was adopted and became effective on December 21,
2015. The requirement to begin reporting discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application has been added the this NPDES
permit. [See Special Condition A. (3.)]
Permit Parameters of Concern:
Flow (MGD) — Flow is limited as the design flow of 0.050 MGD.
Total Susvended Solids t TSSf — TSS limits of 30 mg/L Monthly Average and 45 mg/L Daily
Maximum [per 40 CFR 133.102] are deemed general indicators of effluent quality for these
facilities, and are hereby recommended as a minimum for effluent management. US EPA requires
both a Monthly Average and a Daily Maximum for all parameters limited [40 CFR 122.45 (d.)].
Turbidity — Groundwater facilities have potential to discharge turbid effluents. Considering that
North Carolina has established standards for Turbidity in accord with receiving -stream
classification, monitoring and permit limits are deemed appropriate to evaluate effluent compliance
for freshwater [NCAC 02B. 0211(21). Turbidity monitoring was added along with the Footnote 3
as follows:
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)]
Since this facility discharges to a zero -flow unnamed tributary there is no credit for dilution and the
50 NTU standard applies at the point of discharge.
Fact Sheet
NPDES Permit NC0089729
Page 2

PH — The accordance with 15A NCAC 02B .0211 (14), .0218 and .0219, shall be normal for the
waters in the area, which range between 6.0 and 9.0.
Oil & Grease,(O&G) — [EPA Method 1664 SGT -HEM] O&G monitoring is added as monitoring
only.
Volatile Organic Compounds (VOCs)-- EPA Test method 8260B (Volatile Organic Compounds
by GC/MS) was used to analyze groundwater. Monitoring well data provided in the application (see
application Table 1) indicated the presence of the following VOC compounds listed below at
detectable levels in untreated groundwater:
cis-1,2-Dichloroethylene (gg/L)
77093
Tetrachloroethylene (gg/L)
34475
trans-1,2-Dichloroethylene (mg/L)
34546
Trichloroethylene (gg/L) (gg/L)
39180
Vinyl chloride (gg/L)
39175
Xylenes (gg/L)
81551
1, 1 -Dichloroethylene (gg/L)
34501
Chloroform (mg/L)
32106
2-Butanone (mg/L)
78356
1, 1 -Dichloroethane (gg/L)
34496
1,2,4-Trimethylbenzene (gg/L)
77222
Toluene (gg/L)
34010
Isopropylbenzene (gg/L)
77223
n-Butylbenzene (gg/L)
77342
n-Propylbenzene (gg/L)
77224
1,2,3-Trichloropropane (gg/L)
77443
p-Isopropyltoluene
03908
2-Chlorotoluene (gg/L)
38681
Sec-Butylbenzene (gg/L)
77350
tert-Butylbenzene (gg/L)
77353
North Carolina 15A NCAC 02B Surface Water Standards and Protective Values & EPA Nationally
Recommended Water Quality Criteria that apply to these VOCs are listed in the attached
spreadsheet. Since Little Sugar Creek is currently classified as C waters both fresh water aquatic
(FW) and human health (HH) standards apply for these VOC parameters. The most stringent
standard will be used for the permit limit. Since the facility discharges to an unnamed tributary to
Little Sugar Creek with zero flow conditions the water quality standards apply without dilution. The
applicable standard applies at the point of discharge at Outfall 001 and is given as both the daily
maximum and monthly average limit in the permit [see permit Part I, Section A. (1.)].
Analysis for VOCs/Semi-VOCs serve to identify a comprehensive list of potential contaminants at
new facilities, or to identify parameters of concern (POCs) during GW -REM site assessment.
Additional annual monitoring for VOCs and Semi-VOC is added with the following methods:
Organics, Total Purgeables (VOCs) (EPA Method 624) and Base Neutrals & Acids (Semi -VOCs)
(EPA Method 625)*. Footnote 8 is added to provide instructions for electronic reporting for EPA
Methods 624/625 as follows:
Fact Sheet
NPDES Permit NCO089729
Page 3

8. For the eDMR application system, any detections shall be reported by entering "1" [Yes
(I) =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 keep on file in accordance with records retention
requirements found in Part H, Section D. 6.
*Note: Semi -VOCs monitoring with EPA Method 625 is added because more data is needed.
Total Copper and Hardness — Outfall 001 discharges to an unnamed tributary to Little Sugar Creek [11-
137-8], which is currently listed as impaired for Copper in the 2016 Integrated Report 305(b) [see
attached]. Quarterly monitoring for Total Copper and Hardness have been added to the effluent page for
this permit to establish a database. The stream impairment was based on previous water quality standards
(WQS); therefore, limits will not apply at this time. New WQS have been approved for that are based on
implementation of dissolved metals Criteria. The NC 2007-2014 Water WQS Triennial Review was
approved by the NC Environmental Management Committee (EMC) on November 13, 2014. The US
EPA subsequently approved the WQS revisions on April 6, 2016 with some exceptions. Implementation
of instream dissolved metals Criteria will apply to metals data upon the next renewal. Effluent hardness
sampling and instream hardness sampling, upstream of the discharge, is being inserted into all permits
with facilities monitoring for hardness -dependent metals to build a more robust hardness dataset. This
permit only requires effluent hardness samples because of the zero flow conditions of the unnamed
tributary to Little Sugar Creek. A Total Hardness default value of 25 mg/L is applied for streams with
zero flow conditions.
WET Testing — Chronic Whole Effluent Toxicity (WET) testing (Ceriodaphnia dubia) 7 -day chronic
pass/fail test, permit limit, at 90% in March, June, September and December. See condition A. (3.). Chronic
WET testing is applied due the complex waste stream from groundwater remediation.
Fact Sheet
NPDES Permit NC0089729
Page 4

ii- Final 2016 Category 5 Assessments -303(d) List
E � rt1 South Fork of the Catawba River Subbasin Catawba River Basin
Assessment Unit Name Assessment Unit Description
Assessment Unit Number
Water Quality Classification
Length/Area Units
Long Creek From Mountain Creek to South Fork Catawba River
11=129-16-(4) C 15.3 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria Fair Fish Community (Nar, AL, 'FW)
Maiden Creek
11-129-5-7-2-(3)
From dam at Maiden Reservoir located 680 feet more or less upstream
from the bridge on Catawba County SR 1810 to Pinch Gut Creek
Assessment Criteria Status Reason for Rating
Exceeding Criteria Fair
t,
Parameter of Interest
Benthos (Nar, AL, FW)
Mauney Creek From source to Hoyle Creek
0.4 FW Miles
IR Category
5
11-129-15-5 WS -Iv 4 4 FW Miles
Assessment Criteria Status
Reason for Rating
Parameter of Interest
IR Category
Exceeding Criteria
Poor
Benthos (Nar, AL, FW)
5
Exceeding Criteria
> 10% and < 90% conf
Mill Creek
11-129-8-4-(1)
From source to a point 0.5 mile upstream of mouth
WS-II;HQW
4.6 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria Fair Benthos (Nar, AL, FW) 5
Irwin Creek From source to Sugar Creek
11-137-1 C 11.8 FW Miles
Assessment Criteria Status
Reason for Rating
Parameter of Interest
IR Category
Exceeding Criteria
> 10% and >90 conf
Copper (7 pg/I, AL, FW)
5
Exceeding Criteria
> 10% and < 90% conf
Lead (25 pg/I, AL, NC)
5e
Exceeding Criteria
> 10% and < 90% conf
Zinc (50 pg/I, AL, FW)
5e
Little Sugar Creek From source to Archdale Rd
11-137-8a C 11.6 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria > 10% and >90 conf Copper (7 pg/I, AL, FW) 5
3/23/2018 Final 2016 NC Category 5 Assessments Page 35 of 196

Final 2016 Category 5 Assessments -303(d) List
Ectal
QW&Y
Assessment Unit Name
Assessment Unit Number
Little Sugar Creek
Catawba River Subbasin
Catawba River Basin
Assessment Unit Description
Water Quality Classification Length/Area Units
From Archdale Rd to NC 51
11-137-8b C
Assessment Criteria Status Reason for Rating Parameter of Interest
Exceeding Criteria > 10% and >90 conf Copper (7 ltg/I, AL, FW)
5.5 FW Miles
Little Sugar Creek From NC 51 to North Carolina -South Carolina State Line
IR Category
5
11-137-8c C 3.0 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria > 10% and >90 conf Copper (7 µg/I, AL, FW) 5
McAlpine Creek (Waverly Lake) From source to SR 3356, (Sardis Rd)
11-137-9a C 8.5 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria Fair Benthos (Nar, AL, FW) 5
McAlpine Creek (Waverly Lake) From SR 3356 to NC 51
11-137-9b
Assessment Criteria Status
Exceeding Criteria
Exceeding Criteria
Reason for Rating
Fair
Fair
G
Parameter of Interest
Benthos (Nar, AL, FW)
Fish Community (Nar, AL, FW)
6.3 FW Miles
IR Category
5
5
McAlpine Creek (Waverly Lake) From NC 51 to NC 521
11-137-9c C 4.6 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria Fair Benthos (Nar, AL, FW) 5
Exceeding Criteria Fair Fish Community (Nar, AL, FW) 5
McAlpine Creek (Waverly Lake) From NC 521 to North Carolina -South Carolina State Line
11-137-9d C 1.0 FW Miles
4ssessment Criteria Status
Reason for Rating
Parameter of Interest
IR Category
Exceeding Criteria
Fair
Benthos (Nar, AL, FW)
5
3/23/2018 Final 2016 NC Category 5 Assessments Page 36 of 196

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Supporting Information
Notes & Descriptors
Calc = hardness -dependent metal standards are calculated based on in -stream hardness
(d) = dissolved metal standard. See SSA NCAC 02B.0211 for more information.
(E) = effluent limit for High Quality Waters. See 15A NCAC 02B.0224.
(h) = hardness -dependent dissolved metal standard. See below for hardness -dependent dissolved metal equations. See 15A NCAC 02B .0211 for more information.
(FC) = Fish Consumption
(LD) = limited data.
(N) = narrative standard.
(P) = public policy document.
(s) = toxicity exceeds solubility, no visible sheen or free product in water or on sediment or shoreline per 15A NCAC 0213.0211 &.0220
(t) = based upon measurement of total recoverable metal. See 15A NCAC 026.0211 for more information.
(Tr+ HQW) = trout waters also listed ar High Quality Waters.
WER = Water Effects Ratio. See 15A NCAC 02B.0211 for more information.
(WS) = Water Supply.
Designated Use Definitions
(1) Aquatic Life standards protect both fresh and saltwater aquatic organisms to promote biological integrity. See 15A NCAC 02B.0211 and .0220.
(2) Trout
Fish Consumption standards are based on consumption offish (including shellfish) tissue. These standards are commonly referred to as "Human Health" standards.
15A NCAC 028.0208.
Secondary Recreation standards apply to activities in surface waters that result in incidental body contact. See 15A NCAC 026.0211 and .0220.
Swamp Waters have low velocities and other natural characteristics which are different from adjacent streams. See 15A NCAC 0213.0101.
Water Supply standards are applicable to all Water Supply Classifications (WS I-V) and are based on consumption offish and water. See 15A NCAC 0213 .0208, .0212,
14, .0215, .0216, and .0218.
(7) High Quality Waters area subset of waters with quality higher than the standards and are described in 15A NCAC 02B .0101 and .0224.
(8) Primary Recreation standards apply to activities in surface waters that result in full-body contact. See 15A NCAC 02B .0219 and .0222.
(9) Shellfish Area standards apply to surface waters that are used for shellfishing for market purposes. See 15A NCAC 0213.0221.
(10) Carcinogens are listed in 15A NCAC 02B.0208 and relate to Human Health water quality standards which include fish consumption and water supply. All standards in
this table that are designated as carcinogens were calculated from oral cancer slope values obtained through EPA's Integrated Risk Information System (IRIS).
(11) Acute & chronic values for all metals on the NC 02B Standards table are based on the following language in 15A NCAC 02B .0211:Acute = "Compliance with acute
instream metals standards shall only be evaluated using on average of two or more samples collected with one hour." Chronic = "Compliance with chronic instream
metals standards shall only be evaluated using averages of a minimum of four samples taken on consecutive days, or as a 96 -hour average"
Reference Sources
= Code of Federal Regulations - Title 40
/CSC = Enviromental Protection Agency Ambient Water Quality Criteria
W = Enviromental Protection Agency Quality Criteria for Water
WQCCC = Environmental Protection Agency Nationally Recommended Water Quality Criteria. (FC) denotes Fish consumption, (WS) denotes water supply, and (AL)
s aquatic life Water Quality Criteria.
{ = The ECOTOXicology knowledgebase.
SP = US Food & Drug Administration National Shellfish Sanitation Program.
) = GEI Consultants -Chadwick Ecological Division. Reviewed EPA 2001 Update of Ambient Water Quality Criteria for Cadmium.
IRIS = Integrated Risk Information System.
NPDWR= National Primary Drinking Water Regulations (EPA)
NSDWR = National Secondary Drinking Water Regulations (EPA)
RAIS = The Risk Assessment Information System