NC0089371_Permit (Modification)_20150318

Arf
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory Donald R. van der Vaart
Governor Secretary
March 18, 2015
Mr. David Wolfe
Environmental Program Manager
City of Charlotte
600 East 4t•Street
Charlotte,NC 28202
Subject: NPDES Permit Modification
•
Permit NC0089371
Charlotte Area Transit System Construction
Mecklenburg County
Class I
Dear Mr. Wolfe:
Division personnel have reviewed and approved your representative, Hart and Hickman,
application for modification to the subject permit. Accordingly, we are forwarding the attached
modified NPDES discharge permit. This modified permit is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North
Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently
amended).
Please note that the receiving stream is listed as an impaired waterbody on the North Carolina
2014 303(d) Impaired Waters List. Addressing impaired waters is a high priority with the Division,
and instream data will continue to be evaluated. If there is noncompliance with permitted effluent
limits and stream impairment can be attributed to your facility, then mitigative measures may be
required.
• The permit was original issued in October 2013 for a limited timeframe to accommodate
dewatering activities associated with the Lynx Blue Line extension construction project. Two new
dewatering activities were recently defined along with new discharge locations on Little Sugar Creek.
The new outfalls predicted maximum discharge rate will be same as the existing outfalls, 0.28 MGD.
This permit modification includes the following changes to the existing permit:
1) Change the permit expiration date from September 30, 2015 to June 30, 2017 to
accommodate the extended construction schedule. The total permit duration is less than 4
years.
2) Addition of Outfalls 003 and 004, which may be used to discharge treated wastewater from
any of the four dewatering sites defined for this construction project. These additional
outfalls would discharge to the same receiving waterbody(Little Sugar Creek).
1617 Mail Service Center,Raleigh,North Carolina 27699-1617
Location:512 N.Salisbury St.Raleigh,North Carolina 27604
Phone:[phone] Fax:[phone]
Internet www.ncdenr.gov
An Equal Opportunity\Affirmative Action Employer

David Wolfe, Environmental Program Manager
March 18, 2015
Page 2 of 2
3) Amendment of Outfall 001 and 002 limitation pages, which may be used to discharge
treated wastewater from any of the four dewatering sites defined for this construction
project.
4) Amendment of special condition A. (4) to include a new reporting requirement, which will
provide information on corrective actions made for non-compliance occurrences. The report
will be mailed to the Mooresville Regional Office.
If this temporary construction activity is completed prior to January 2017, please notify the
Division whether the intention is to apply for a major permit modification for converting this permit to
a permanent groundwater remediation discharge or the permit is no longer needed, in which case
request permit rescission.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless
such demand is made,this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect the
legal requirements to obtain other permits which may be required by the Division of Water Resources
or any other Federal, State, or Local governmental permits that may be required.
If you have any questions concerning this permit,please contact Ron Berry at telephone
number(919) 807-6396 or at email [e-mail].
S'A cerely4,094Ak—
.
U BVI
Jay Zimmerman
,
Director, Division of Water Resources
Enclosure: Modified NPDES Permit NC0089371
Cc: NPDES File
Central Files
Mooresville Regional Office/Water Quality Programs(attach Fact Sheet Addendum)
ecopy:
SCDHEC/Mike Montebello(email with Fact Sheet Addendum)
Email: [e-mail]
Mecklenburg County/Richard Farmer(email)
Email: [e-mail]
Hart and Hickman/Joselyn Harriger(email)
Email:[e-mail]

•
. Permit NC0089371
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,the
City of Charlotte
is hereby authorized to discharge wastewater from a facility located at the
Charlotte Area Transit System Construction
Nearby Cullman Ave and Nearby Alpha Mill Lane
Mecklenburg County
to receiving waters designated as the Little Sugar Creek and an unnamed tributary to Little Sugar
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.
This modified permit shall become effective March 18, 2015.
This permit and authorization to discharge shall expire at midnight on June 30, 2017.
Signed this day March 18, 2015.
( "tfillAir(----
ay Zimmerman
/Director,Division of Water Resources
&I
By Authority of the Environmental Management Commission
Page 1 of 6

Permit NC0089371
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.
City of Charlotte
is hereby authorized to:
•
1. Discharge wastewater from City of Charlotte dewatering construction operation to Outfalls 001
(nearby Cullman Ave), 002 (nearby Alpha Mill Lane), 003 (nearby Norfolk Southern Intermodal
Facility), 004 (nearby Raleigh Street), estimated peak flow of 195 gpm (0.28 MGD). Permittee
anticipates treatment components to consist of combination of settling, filtering, air stripping,
activated carbon adsorption, and ionic resins adsorption.
The mobile treatment system or systems are located in Charlotte in conjunction with the
construction of Charlotte Area Transit System dewatering sites in Mecklenburg County.
2. Discharge from said treatment works at the locations specified on the attached map into the Little
Sugar Creek Outfalls 001, 003, and 004, an unnamed tributary into Little Sugar Creek Outfall 002,
classified C waters in the Catawba River Basin.
Page 2 of 6

Permit NC0089371
A. (2) EFFLUENT LIMITATIONS AND MONtT(JNG REQUIREMENTS 7'
a. During the period beginning on the effective date of this modified permit and lasting until
expiration, the Permittee is authorized to discharge treated construction dewatering wastewater
from Outfa11002. Such discharges shall be limited and monitored by the Permittee as specified
below:
EFFLUENT EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Average 1 Measurement Sample Sample 2
Frequency Type Location
Flow,MGD Continuous 3 Recording Effluent
Total Suspended Solids 30.0 mg/L Twice per Grab Effluent
Month
Not less than 6.0 S.U. nor Twice per
pH greater than 9.0 S.U. Month Grab Effluent
Tetrachloroethene• 3.3 Twice per
µ Month Grab Effluent
Trichloroethene 30 Twice per
µms` Month Grab Effluent
Twice per
Toluene 11 µg/L Month Grab Effluent
Total Chromium 50 Twice per
µms" Month Grab Effluent
Twice per
Total Copper 7118/1- Month Grab Effluent
ice
Turbidity 50 NTU 4 daily limit T Monther Grab Effluent
Footnotes:
1. If any monthly average limits are exceeded a Compliance Action Report shall be submitted
to the Mooresville Regional Office, see special condition A. (4).
2. Effluent sample shall be taken after the last treatment component and before discharge into
approved storm sewers connecting to Little Sugar Creek or direct discharge to Little Sugar
Creek tributaries.
3. An effluent meter with flow totalizer shall be installed. A daily log shall be maintained and
available for inspection indicating the date of operation, the total flow volume discharged on
that date, and the number of hours of operation on that date.
4. The Permittee can demonstrate compliance with the turbidity limit by sampling 100 ft
upstream and downstream from the discharge during a discharge event, in which case the
discharge shall not cause the downstream turbidity to exceed 50 NTU or if the upstream
turbidity is above 50 NTU then the discharge shall not cause an increase in turbidity.
b. All samples collected shall be from a representative discharge event.
c. Discharges to individual storm sewers require review and approval by Charlotte's Utility
Department.
Page 4 of 6

Permit NC0089371
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
a. During the period beginning on the effective date of this modified permit and lasting until
expiration, the Permittee is authorized to discharge treated construction dewatering.wastewater
from 014211 001. Such discharges shall be limited and monitored by the Permittee as specified
below:
EFFLUENT EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Average 1 Measurement Sample Sample a
Frequency Type _Location
Flow, MGD Continuous 3 Recording Effluent
Total Suspended Solids 30.0 mg/L Twice per Grab Effluent
Month
Not less than 6.0 S.U. nor Twice per
pH greater than 9.0 S.U. Month Grab Effluent
Tetrachloroethene 46 µg/L Twice per Grab Effluent
Month
Trichloroethene 417 µg/L Twice per Grab Effluent
Month
Toluene 22 µg/L Twice per Grab Effluent
Month
Total Chromium 101 µg/L Twice per Grab Effluent
Month
Total Copper 7118/1- Twice per Grab Effluent
Month
Turbidity 50 NTU 4 daily limit Twice per Grab Effluent
Month
Footnotes:
1. If any monthly average limits are exceeded a Compliance Action Report shall be submitted
to the Mooresville Regional Office, see special condition A. (4).
2. Effluent sample shall be taken after the last treatment component and before discharge into
approved storm sewers connecting to Little Sugar Creek, or before direct discharge into
Little Sugar Creek.
3. An effluent meter with flow totalizer shall be installed. A daily log shall be maintained and
available for inspection indicating the date of operation, the total flow volume discharged on
that date, and the number of hours of operation on that date.
4. The Permittee can demonstrate compliance with the turbidity limit by sampling 100 ft
upstream and downstream from the discharge during a discharge event, in which case the
discharge shall not cause the downstream turbidity to exceed 50 NTU or if the upstream
turbidity is above 50 NTU then the discharge shall not cause an increase in turbidity.
b. All samples collected shall be from a representative discharge event.
c. Discharges to individual storm sewers require review and approval by Charlotte's Utility
Department.
Page 3 of 6

Permit NC0089371
A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
a. During the period beginning on the effective date of this modified permit and lasting until
expiration, the Permittee is authorized to discharge treated construction dewatering wastewater
from Outfall 003 and 004. Such discharges shall be limited and monitored by the Permittee
as specified below:
EFFLUENT EFFLUENT LIMITS MONITORING REQUIRMENTS
CHARACTERISTICS Monthly Average z Measurement Sample Sample s
Frequency Type Location
Flow, MGD Continuous 4 Recording Effluent
Total Suspended Solids 30.0 mg/L Twice per Grab Effluent
Month
Not less than 6.0 S.U. nor Twice per
pHgreater than 9.0 S.U. Month Grab Effluent
Tetrachloroethene 36 Twice per
µms' Month Grab Effluent
Trichloroethene 324 Twice per
µms" Month Grab Effluent
Twice per
Toluene 19 tg/L Month Grab Effluent
Total Chromium 88 Twice per
µms" Month Grab Effluent
Twice per
Total Copper 7 RA- Month Grab Effluent
ce
Turbidity 50 NTU 5 daily limit TwiMonth r Grab Effluent
Footnotes:
1. Sampling and Discharge Monitoring Reports shall be completed for each individual Outfall
003 and 004 upon discharge to that specific outfall.
2. If any monthly average limits are exceeded a Compliance Action Report shall be submitted
to the Mooresville Regional Office, see special condition A. (4).
3. Effluent sample shall be taken after the last treatment component and before discharge into
approved storm sewers connecting to Little Sugar Creek, or before direct discharge into
Little Sugar Creek.
4. An effluent meter with flow totalizer shall be installed. A daily log shall be maintained and
available for inspection indicating for each outfall the date of operation, the total flow
volume discharged on that date, and the number of hours of operation on that date.
5. The Permittee can demonstrate compliance with the turbidity limit by sampling 100 ft
upstream and downstream from the discharge during a discharge event, in which case the
discharge shall not cause the downstream turbidity to exceed 50 NTU or if the upstream
turbidity is above 50 NTU then the discharge shall not cause an increase in turbidity.
b. All samples collected shall be from a representative discharge event.
c. Discharges to individual storm sewers require review and approval from Charlotte's Utility
Department.
Page 5 of 6

Permit NC0089371
A. (4) OPERATION LOG
A daily log shall be maintained and available for inspection that provides details for each individual
treatment system, but not limited to, that mobile treatment system's configuration, system operation's
event that significantly compromise treatment, maintenance, and indicated when treatment components
are cleaned, replaced, added, or removed. For example, when an activated carbon canister is replaced or
filter is cleaned. In addition upon completion of each DMR report, if any permit limits are not in
compliance (reported averages or turbidity exceed limits) a Compliance Action Report indicating actions
taken to mitigate the cause of the non-compliance shall be submitted to:
NCDENR/DWR
Water Quality Section
Mooresville Regional Office
610 East Center Ave, Suite 301
Mooresville,NC 28115
Atten: Compliance Action Report NC0089371
The Mooresville Regional Office/Water Quality Section (704) 663 — 1699 is the point of contact for
questions related to the scope of information to be included in the Compliance Action Report.
Page 6 of 6

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USGS Quad: G14NE Charlotte East, NC
Outfall Latitude Longitude
001 350 15' 0.7" N 800 48' 33" W
002 350 13' 59.3" N 800 49' 48.8" W
003 350 14' 35.3" N 800 48' S5.6" W Facility Location
004 350 15' 18.5" N 800 4752.7 W North
Stream Class: C Subbasin: 03-08-14 HUC: 03050103 Charlotte Area Transit System Construction
Receiving Stream: Little Sugar Creek, UT to Little Sugar Creek Mecklenburg Count