NC0086517_Permit Issuance_20111128

NCDEE R
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
November 28, 2011
David L. Edwards
Cousins Property, Inc.
800 West Trade Street, Suite 100
Charlotte, NC 28202
Subject: Issuance of NPDES Permit
Permit NCO086517
Dee Freeman
Secretary
Gateway Village Groundwater Remediation
Facility Class I
Mecklenburg County
Dear Mr. Edwards:
Division personnel have reviewed and approved your application for reinstatement of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant
to the requirements of North Carolina General Statute 143-215.1 and 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 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.
Summary Final Permit Requirements
1) Instantaneous flow monitoring with a monthly limit.
2) Monthly monitoring for Total Suspended Solids, Tetrachloroethene, and Cis-1,2 dichloroethene with
monthly and daily limits.
3) Monthly monitoring for pH with a daily limit range.
Page 1 of 2
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] \ FAX: [phone] \ Customer Service: 1-877-623.6748
Internet: w .nmaterquality.org
An Equal Opportunity \ Aflirmabve Action Employer
NorthCarolina
Naturally,

4) Quarterly monitoring for Total Copper, Total Lead, Total Zinc, Chloroform, 1,2 dichloroethane,
Trichloroethene, Oil and Grease, Total Iron, and Total Manganese.
5) Quarterly monitoring for Chronic Toxicity with a limit narrative.
6) Submittal of influent Volatile Organic Compounds analysis with the next permit renewal application.
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 aftennotice 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 Quality or permits
required by the Division of Land Resources, the Coastal Area Management Act or any other federal 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].
Sincerely, �, Q
oleen H. Sullins
Attachments
Cc: Mooresville Regional Office/Surface Water Protection Section (email with Fact Sheet)
Environmental Sciences Section/Aquatic Toxicology Unit/Susan Meadows (email)
Hunter Hicks E.I. AMEC (emaiL•HMHICKS@mactec,com)
Mecklenburg County/ Erin Hall (email:[e-mail])
NPDES Files
Central Files
Page 2 of 2

Permit: NCO086517
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
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,
Gateway Village LLC
is hereby authorized to discharge wastewater from a facility located at
Gateway Village
800 Block of West Trade Street
Charlotte
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.
This permit shall' become January-1, 2012.
This permit and authorization to discharge shall expire at midnight on June 30, 2015.
Signed this day November 28, 2011.
en H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit: NC0086517
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of
this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the
exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements,
terms, and provisions included herein.
Gateway Village LLC
is hereby authorized to:
1. To operate a 0.05 MGD ground water treatment facility discharging treated groundwater, and consisting
of:
0 1200 gallon collection tank with pump
o Two (2) bag filters
o Two (2) 1000 lb activated carbon canisters (in series)
o Effluent meter with recorder
Facility is located in Charlotte on the 800 block of West Trade Street in Mecklenburg County.
2. Discharge from said treatment works at the location specified on the attached map through outfall 001
(via a storm sewer) to an unnamed tributary to Irwin Creek, which is classified C water in the Catawba
River Basin.

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Gateway Village
Facility NC40$6517'in `
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NC0086517�
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USGS Quad: G15NE Charlotte, East, NC
Outfall Facility
Latitude: 35' 14' 4.2" N 350 14' 4.4" N
r
Longitude: 80051' 6" W 800 51' 5.7" W
Facility Location
Stream Class: C
North
Subbasin: 03-08-34 HUC: 03050103
Gateway Village NC0086517
Receiving Stream: Unnamed tributary to Irwin Creek
Mecklenburg County

Permit N0008651.7
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to
discharge treated groundwater from Outfall 001. Such discharges shall be limited and monitored by the
Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily .`
Maximum
Measurement
Frequency-
Sample
Type
Sample
Location
Flow
0.05 MGD
WeeklyInstantaneous
Effluent
Tetrachloroethene
8.9 µg1l
8.9 jLg1l
Monthly
Grab
Effluent
Cis 1,2 dichloroethene
4.9 µg/l
4.9 µg/1
Monthly
Grab
Effluent
Total Suspended Solids (TSS)
30.0 m 1
45.0 mg/1
Monthly
Grab
Effluent
pH
Not greater than 9.0 S.U. nor
less than 6.0 S.U.
Monthly
Grab
Effluent
Total Copper, Ag1l
Quarterly
Grab
Effluent
Total Lead, g/l
Quarterly
Grab
Effluent
Total Zinc, µg/1
Quarterly
Grab
Effluent
Chloroform, µg/1
Quarterly
Grab
Effluent
1,2 dichloroethane, µg/1
Quarterly
Grab
Effluent
Trichloroethene (TCE), AgIl
Quarterly
Grab
Effluent
Oil and Grease, mg/1
Quarterly
Grab
Effluent
Total Iron, µ 1
Quarterly
.'Grab
Effluent
Total Manganese, µg/1
Quarterly
Grab
Effluent
Chronic Toxicity
Quarterly
Grab
Effluent
Footnotes:
1. Flow must be determined by an effluent meter.
2. A minimum detection limit of 1.0 µg/l is required.
3. The sample to be skimmed from the surface of a quiescent zone if possible.
4. Chronic Toxicity (Ceriodaphnia), P/F at 90 °Io, January, April, July, and October; or first month in
each quarter that a discharge occurs. A quarter is defined as January — March, April — June, July —
September, and October — December. See Special Condition A. (2) Chronic Toxicity Permit Limit
(Qrtrly). Sample to be collected at same time as monitored pollutants samples.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
There shall be no oily sheen traceable from the receiving stream to this outfall.

Permit NCO086517
A. (2) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or
subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) or subsequent versions. The tests will be performed during the months of
January, April, July, and October. Effluent sampling for this testing shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the
highest concentration having no detectable impairment of reproduction or survival and the lowest
concentration that does have a detectable impairment of reproduction or survival. The definition of
"detectable impairment," collection methods, exposure regimes, and further statistical methods are
specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
All toxicity testing results required as . part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed. If reporting pass/fail
results using the parameter code TGP3B, DWQ Form AT-1 (original) is sent to the below address. If
reporting Chronic Value results using the parameter code THP3B, DWQ Form AT-3 (original) is to be
sent to the following address:
Attention: NC DENR / DWQ I Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental 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, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. 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
Environmental Sciences Section at the address cited above.

Permit NCO086517
(Continued from A. (2) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY))
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of such
monitoring shall be included in the calculation and reporting of the data submitted on the DMR and AT
Forms.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, 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.
A. (3) INFLUENT VOLATILE ORGANIC COMPOUND ANALYSIS
The Permittee shall perform an analysis of the influent Volatile Organic Compound (VOC) and submit
the analysis as an addendum in the next permit renewal application. This VOC analysis shall be from a
representative influent sample taken in the same calendar year the application is submitted.

DENR/DWQ ,
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES Permit NCO086517
Facility Information
Applicant/Facility
Name:
Gateway Village, LLC GWR
Applicant Address:
800 West Trade Street; Charlotte, NC 28202
Facility Address:
800 West Trade Street; Charlotte, NC 28202
Permitted Flow
0.05 MGD
Type of Waste:
GW dewatering treated wastewater
Facility/Permit Status:
Class I /Deactivated; Activation/Renewal
County:
Mecklenburg County
Miscellaneous
Receiving Stream:
UT to Irwin Creek
Stream Classification:
C
Subbasin:
03-08-34
Index No.
11-137-1
Drainage Area (mi):
-
HUC:
03050103
Summer 7Q10 (cfs)
0
303(d) Listed?
Yes , see History
Winter 7Q10 (cfs):
0
Regional Office:
Mooresville
30Q2 (cfs)
0
State Grid / USGS
Quad:
G15NE
Charlotte East, NC
Average Flow (cfs):
0
Permit Writer:
Ron Berry
IWC (%):
100
Date:
9/14/11
Irwin Creek has 7Q 10s = 0.49 cfs (2000 fact sheet)
History
Development and construction at the Gateway Village site was begun in 1998, the site previously
had other commercial businesses including a gas station and a meat processing facility.
Consequently, the site ground water was identified as being impacted by petroleum and
chlorinated solvents. During the construction dewatering phase and temporary dewatering after
construction, and until a permanent remediation system could be permitted with the state, the
Charlotte Mecklenburg Utility Department accepted the waste water discharge.
A slurry wall to stop the migration of contaminates off site, collection sumps, and the approved
ground water treatment system to remove contaminates were installed. The local utility agreed to
allow the direct discharge of the parking garage dewatering sump that contained relatively clean
ground water to the storm drain. A NPDES permit was granted in 2001 to discharge treated
wastewater from the treatment system to the storm drain which eventually flows into Irwin
Creek via an unnamed tributary. The unnamed tributary is considered a "zero" flow stream.
The ground water treatment operation consisted of a single collection sump and pump that
conveyed captured contaminated ground water intermittently to the treatment system 1200 gal
collection tank. Once the collection tank was full, it was pumped at a maximum rate of 50 GPM
through bag -type particle filters, through replaceable GAC filters, and through an effluent flow
meter. Then the treated wastewater was discharged into the local storm drain. With the
extremely low flow from the sump and large storage capacity of the collection tank this system
did not run very often.
From 2001 to 2005, the discharge from the treatment system had only occurred a few days a
year. Beginning in 2005 and until the permit's scheduled 2010 renewal there had been no
Fact Sheet
NPDES NCO086517
Page 1 of 3

discharges. The Permittee requested the permit not be revewed but rescinded which was granted
in June 2010.
As part of the City of Charlotte green initiative, the property owner incorporated the parking
garage dewatering sump water as a water supply to its building cooling systems. However, 2010
analyses of the parking garage dewatering sump water indicated chlorinated solvent intrusion
had occurred. The owner rerouted the parking garage dewatering sump to the idle groundwater
remediation system for pre-treatment prior to recycling to internal users.
The treatment system present operation is to collect wastewater from multiple sumps, remove
contaminates, and provide treated wastewater as cooling tower make up, or if needed divert the
treated wastewater to the NPDES outfall. The Permittee has requested re -activation of the
NPDES permit and submitted a NPDES permit application.
Irwin Creek and its unnamed tributaries are currently impaired for copper, lead, zinc, turbidity,
fecal coliform, and ecological/biological integrity to the fish community. A TMDL has been
completed for turbidity and fecal coliform but are not applicable to this discharge at this time.
Permitting Strategy
EAA Review
The Permittee was asked to re -submit the original EAA with any changes that may apply. There
were no changes to the treatment system or alternative non -discharge options. The numbers
provided indicate the typically influent rate is anticipated to be less than 5 gpm. The Permittee
will be reminded in the cover letters that any planned equipment changes or influent changes
need to be reviewed by the Division. Also, the Permittee will be instructed to provide new
influent data as part of his next permit renewal.
Data Review
As part of the permit application, the Permittee was required to submit analyses on the
wastewater influent. Because of the limited historical DMR data points and anticipated continued
long periods of no discharge, the rescinded permit requirements will be adopted with
additions/changes to monitoring frequency and parameters based on the latest sump influent data
and Division guidelines. Mooresville Regional Office conducted a site inspection in April 2011,
and recommends re -activating this permit contingent on their review and approval of its
requirements.
Oil and Grease; 1,2 dichloroethane; chloroform; iron; manganese; and trichloroethene
monitoring were reduced to quarterly to be consistent with Division guidelines.
Tetrachloroethene and cis-1,2 dichloroethene were present in the influent data is excess of water
quality standards, monthly limits with monthly monitoring will be required. Tetrachloroethene
and cis-1,2 dichloroethene have no acute standard or daily limit criteria. To be in compliance
with EPA guidance the tetrachloroethene and cis-1,2 dichloroethene monthly limit will also be
assigned as the daily limit.
Monthly pH monitoring with a daily limit range will be added to this permit. Flow and TSS
monitoring and limits remain unchanged from the rescinded permit.
Toxicity Review
Only one chronic toxicity test had ever been completed during the history of this discharge and
was failed. To define the unknown toxic nature of the new effluent and assist with this permit
Fact Sheet
NPDES NC0086517
Page 2 of 3

f.
development, the owner was required to provido the results of a chronic toxicity test at 90%
concentration. The new effluent passed its chronic toxicity test. Will continue to require
quarterly chronic toxicity testing with narrative limit. Will update narrative in footnote to remind
Permittee that the first discharge in any given quarter is subject to the required quarterly chronic
test. Will update the special condition narrative to the current version.
Impairment Review
Copper, lead, and zinc are listed impairments for this watershed. New influent data for copper,
lead, and zinc and effluent chronic toxicity test were requested and provided. The effluent
chronic toxicity test was passing. Reported copper and zinc levels were above 300 µg/L, but
copper and zinc are action level so quarterly monitoring will be required. The influent lead level
did not exceed WQS so only quarterly monitoring will be required. The reported data will be
reviewed at the next renewal. Turbidity and fecal coliform are also listed impairments for this
watershed but are not considered parameters of concern from this discharge. The Division
impairment notification statement will be included in all cover letters.
Other Regulatory Authority Review
Since this discharge is in Charlotte Mecklenburg Utility Department jurisdiction, they will be
sent this permit for review.
SUMMARY OF PROPOSED REQUIREMENTS
In keeping with Division policies the following will be incorporated into the permit:
• Quarterly monitoring for Oil and Grease; 1,2 dichlorethane; chloroform; copper; iron;
lead; manganese; trichlorethene; and zinc; will be established.
• Monthly monitoring for TSS, pH, tetrachloroethene, and cis-1,2 dichloroethene with
limits will be established.
• Quarterly chronic toxicity testing with narrative limit will be established.
• A footnote narrative defining the minimum report limit for various pollutants will be
established.
• A special condition narrative defining chronic toxicity testing and reporting will be
established.
• A special condition requiring submittal of influent VOC with the next renewal
application will be established.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: September 28, 2011
Permit Scheduled to Issue: November 2011
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please
contact Ron Berry at (9121807-6396 or email [e-mail].
REGIONAL OFFICE COMMENTS
SUPERVISOR: DATE:
Fact Sheet
NPDES NCO086517
Page 3 of 3

NPDES Permit NCO086517
From: Hicks, Hunter [[e-mail]]
sent: Wednesday, March 23, 2011 11:22 AM
To• Berry, Ron
subject: NPDES Permit NCO086517
Attachments: system Schematic.pdf; original Permit Application.pdf
Mr. Berry,
I found the original permit application with the EAA on page 4. I will attach this
and a schematic of the
system to this email. I will also mail a hard copy of the original permit
application with EAA for your
records.
For clarification, the water reuse program is proposed and no changes have been made
to the system.
At some point in the future, Gateway plans to tap into the system after the flow
meter and use water
for part of the buildings cooling system. This is reflected in the attached
schematic. If you need any
more information, please let me know.
Thanks
Hunter M. Hicks IV, E.I. ? staff Engineer II
MACTEC Engineering and Consulting, Inc.1 Charlotte, NC
office 704-357-5554 ? Fax [phone]
Email [e-mail]? web www.mactec.com
Page 1

• r a
i
NC 2010 Integrated Report Categories 4 and 5 Impaired Waters
=Alll§§ 23 Watemin NC are in Category 5-303(0) List for Mercury du:e to statewide fish. consumption advice for several fish species
AU ,Number ALIName ALIDescription LengthArea AU_Units Classification
Category Parameter Reason for Rating Use Category Collection Year 303(d)year
Catawba River Basin
Catawba River Basin
Sugar Creek Watershed 030SO10301
Catawba River Subbasin 03050103
Catawba River Basin
Q 11-137-1 Irwin Creek
5 Copper
From source to Sugar Creek
Standard Violation
Sugar Creek Watershed 0305010301
11.8 FW Miles C
Aquatic Life 2006 2010
4s
Ecological/biological Integrity FishCom
Poor Bioclassification
Aquatic Life
2004
1998
4t
Fecal Coliform (recreation)
Standard Violation
Recreation
2008
2008
S
Lead
Standard Violation
Aquatic Life
2006
2008
4t
Turbidity
Standard Violation
Aquatic Life
2008
2000
5
Zinc
Standard Violation
Aquatic Life
2006
2010
Q
11-137-8a Little Sugar Creek
5 Copper
From source to Archdale Rd
Standard Violation
Aquatic Life
11.6 FW Miles
2008
C
2008
4s
Ecological/biological Integrity Benthos
Poor Bioclassification
Aquatic Life
2008
2008
4s
Ecological/biological Integrity FishCom
Fair Bioclassification
Aquatic Life
2007
2010
4t
Fecal Coliform (recreation)
Standard Violation
Recreation
2008
1998
4t
Turbidity
Standard Violation
Aquatic Life
2008
2010
5
Water column Mercury
Standard Violation
Fish Consumption
2008
2010
Q
11-137-8b Little Sugar Creek
5 Copper
From Archdale Rd to NC 51
Standard Violation
Aquatic Life
S.S FW Miles
2006
C
2010
4s
Ecological/biological Integrity Benthos
Fair Bioclassification
Aquatic Life
2007
1998
4s
Ecological/biological Integrity FishCom
Fair Bioclassification
Aquatic Life
2007
2010
4t
Fecal Coliform (recreation)
Standard Violation
Recreation
2008
1998
Q
11-137-8c Little Sugar Creek
4s Ecological/biological Integrity Benthos
From NC 51 to North Carolina -South
Carolina State Line
Poor Bioclassification Aquatic Life
3.0 FW Miles
1983
C
2000
4t
Fecal Coliform (recreation)
Standard Violation
Recreation
2008
1998
4t
Turbidity
Data Inconclusive
Aquatic Life
2008
2000
Q
11-137-9a
5
McAlpine Creek
(Waverly Lake)
Ecological/biological Integrity Benthos
From source to SR 3356, (Sardis Rd)
Fair Bioclassification Aquatic Life
8.5 FW Miles
1987
C
1998
4t
Fecal Coliform (recreation)
Standard Violation
Recreation
2008
1998
NC 2010 Integrated Report Category 4 and 5 303(d) List EPA Approved Aug 31, 201 9/20/2010 Page 28 of 145

RE Gateway village reply comment
From: Berry, Ron
Sent: Monday, October 17, 2011 3:22 PM
To: 'Hicks, Hunter'
subject: RE: Gateway village
Hunter,
No problem, the narrative will be amended to "if possible".
Ron
Ron Berry [e-mail]
Engineer I
DWQ/Point Source/NPDES Complex Permitting unit
NCDENR
Phone: [phone]
Fax: [phone]
office: Archdale Building Room 925N
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and
may be disclosed to third parties unless the content is exempt by statute or other
regulation.
From: Hicks, Hunter [mailto:[e-mail]]
Sent: Thursday, October 13, 2011 1:49 PM
To: Berry, Ron
Cc: Reed, Kerry
Subject: RE: Gateway village
Ron,
In looking over the permit (NC0086517) we had a question about the oil and grease
sampling: In the
permit, it states that "the sample must be skimmed from the surface of the quiescent
zone." Due to
the setup at our facility, there is not a quiescent zone. Can we get the language
changged to "the
sample must be skimmed from the surface of the quiescent zone if possible." This
would be the same
as the previous permit.
I have attached a picture of the sampling location and there is not an open area to
"skim" a sample.
The flow goes through the flow meter into a closed storm drain. Please excuse the
MS Paint graphics.
Thanks
Hunter M. Hicks IV, E.I. ? staff Engineer II
AMEC E & I
office 704-357-5554 ? Fax [phone]
Email [e-mail]? web www.amec.com
From: Berry, Ron [mailto:[e-mail]]
sent: Tuesday, October 04, 2011 3:28 PM
To: Hicks, Hunter
subject: RE: Gateway village
Hunter,
I regret I had not sent you a copy as promised, but attached is the draft permit and
Page 1

RE Gateway village reply comment
cover letter.
Ron
Ron Berry [e-mail]
Engineer I
DWQ/Point Source/NPDES Complex Permitting unit
NCDENR
Phone: [phone]
Fax: [phone]
office: Archdale Building Room 925N
Email correspondence to and from this address is subject to the North Carolina
Public Records Law and
may be disclosed to third parties unless the content is exempt by statute or other
regulation.
From: Hicks, Hunter [mailto:[e-mail]]
Sent: Tuesday, October 04, 2011 11:24 AM
To: Berry, Ron
subject: Gateway village
Ron,
we just saw the Gateway village notice on the DENR website posted 9/28/11. Can we
get a copy of
the draft permit?
Thanks
Hunter M. Hicks IV, E.I. ? Staff Engineer II
AMEC E & I
office 704-357-5554 ? Fax [phone]
Email [e-mail]? web www.amec.com
Page 2

The Charlotte Observer Publishing Co.
Charlotte, NC
North Carolina ) ss Affidavit of Publication
Mecklenburg County)
THE CHARLOTTE OBSERVER
NCDENR/DWD/POINT SOURCE B
1617 MAIL SERVICE CENTER
RALEIGH NC 27699
REFERENCE: 40508896 D.SPRINKLE
031155/6604641 GATEWAY - NPDES
Before the undersigned, a Notary Public of said
County and State, duly authorized to administer
oaths affirmations, etc., personally appeared,
being duly sworn or affirmed according to law,
doth depose and say that he/she is a
representative of The Charlotte Observer
Publishing Company, a corporation organized and
doing business under the laws of the State of
Delaware, and publishing a newspaper known as The
Charlotte Observer in the city of Charlotte,
County of Mecklenburg, and State of North Carolina
and that as such he/she is familiar with the
books, records, files, and business of said
Corporation and by reference to the files of said
publication, the attached advertisement was
inserted. The following is correctly copied from
the books and files of the aforesaid Corporation
and Publication.
PUBLISHED ON: 09/30
Public Notim
NaM Cerollaa Emironmanfal Managerneat
CommsebnJNPDES Unit
1617 Mee Service Canter
aelelgh, NC 27SO W 7
Nabial of Intent in Iwue a NPDES WaetawaUX Parma
Nolan Carolina Environrtreniel Management Commvsslon
ogee to weal a NPDES wagtevwd rdacharge Permit to the
,ntgt all babes. ....
100. ChafbnG.
17 for Gateway
q County; the
an uanabled
Woman, quaiay
e In this partion
AD SPACE: 64 LINE
FILED ON: 10/06 1
________ ____ __ _ _________%� ( /�
NA TITLE: fJ�I�n"L� CS ✓
DATE:
In Tes mony Whereof I have hereunto set my hand and affixed my seal, the `
day and yfir aforesaid./,/J� ����J,(/, _
Nota / 6� 1� V ""' M Okni sMn Expires:
My CommmW EXPWVS MW V, 2016

August 15, 2011
Mr. Ron Berry
North Carolina Department of Environment and Natural Resources
DWQ/Point Source/NPDES Complex Permitting Unit
1628 Mail Service Center
Raleigh, NC 27699-1628
Subject: Additional Information for NPDES Permit Developmer
Gateway Village
800 West Trade Street
Charlotte, Mecklenburg County, North Carolina 28202
AMEC Project: 6228-08-4564
=D
n�_AUG-..22
NRQUALITY
Dear Mr. Berry:
On behalf of Gateway Village, LLC care of Cousins Properties, Inc., AMEC submits the
additional information as requested by the NCDENR to complete the NPDES permit.
On July 18, 2011, AMEC collected a sample from the effluent of the system for analyses of
chronic toxicity by the LC50/Acute Toxicity Test method. The effluent sample passed with 0%
mortality at all analyzed concentrations. The results are attached. As stated in an email on July
11, 2011 from Mr. Berry to Mr. Hunter Hicks of AMEC, "The purpose of passing this toxicity test
is to demonstrate the current dewatering sources can be successfully treated and thus eliminate
the addition of copper and zinc limits based on the current Division policy for NPDES permit
development."
Additionally, as an engineering alternative analysis, Mr. Berry requested that AMEC contact
Charlotte -Mecklenburg Utilities to determine if Charlotte -Mecklenburg Utilities would accept
effluent from the system. On August 2, 2011, Mr. Hicks spoke with Mr. Bill Gintert of the
Systems Protection, Environmental Management Division of Charlotte -Mecklenburg Utilities.
Mr. Gintert informed AMEC that Charlotte -Mecklenburg Utilities does not accept groundwater
and therefore, would not accept effluent from the system since it originates from a groundwater
sump. A letter from Mr. Gintert summarizing the conversation is attached.

Additional Information for NPDES Permit Development
Gateway Village
AMEC Project. 6228-10-5369
August 15, 2011
AMEC, on behalf of Gateway Village, requests that NCDENR considers the above information
for permit development. If the NCDENR has additional questions or comments, please contact
Hunter Hicks or Kerry Reed at AMEC at 704-357-8600. AMEC respectfully requests that the
NCDENR provides both Cousins Properties and AMEC with a copy of the draft permit when it is
issued for public notice.
Sincerely,
AMEC E & I, INC.
Kerry A. Reed, P.E., LEED AP
Senior Engineer
, �h ;
Robert C. Foster, L.G.
Project Manager
cc: Mr. Samar Bou-ghazale, NCDENR — Mooresville Regional Office
Mr. David Edwards, Cousins Properties
Attachments:
Laboratory Report
Letter from Charlotte Mecklenburg Utilities, dated Aug 10, 2011

aceAnalytical e
w pawlaasmff.
July 29, 2011
Mr. Hunter Hicks
AMEC-Charlotte
2801 Yorkmont Road, Ste 100
Charlotte, NC 28208
Pace Analytical Services, Inc.
205 East Meadow Road - Suite '
Eden, NC 27288
[phone]
RE: Project: EFFLUENT
Pace Project No.: 9298459
Pace Analytical Services, Inc.
2225 Riverside Dr.
Asheville, NC 28804
[phone]
b� 1�lz
Pace Analytical Services, Inc.
9800 Kincey Ave. Suite 100
Hunlersville, NC 28078
[phone]
Dear Mr. Hicks:
Enclosed are the analytical results for sample(s) received by the laboratory on July 18, 2011. The
results relate only to the samples included in this report. Results reported herein conform to the
most current TNI standards, where applicable, unless otherwise narrated in the body of the report.
Analyses were performed at the Pace Analytical Services location indicated on the sample analyte
page for analysis unless otherwise footnoted.
If you have any questions concerning this report, please feel free to contact me.
Sincerely,
r:l
Kevin Godwin
[e-mail]
Project Manager
Enclosures
REPORT OF LABORATORY ANALYSIS
This report shall not be reproduced, except in full,
without the written consent of Pace Analytical Services, Inc..
Page 1 of 2

01
• ' ® Pace Analytical Services, Inc. Vace Analytical Services, Inc. Pace Analytical Services, Inc.
ice Analytical 205 East Meadow Road - Suite A 2225 Riverside Dr. 9800 Kincey Ave. Suite 100
I -- www.pacelabs.com Eden, NC 27288 Asheville, NC 28804 Huntersville, NC 28078
[phone] [phone] [phone]
PROJECT NARRATIVE
Project:
Pace Project No.:
Method:
Description:
Client:
Date:
This data package has been reviewed for quality and completeness and is approved for release.
REPORT OF LABORATORY ANALYSIS
Page 2 of 2
This report shall not be reproduced, except in full.
without the written consent of Pace Analytical Services, Inc..

Effluent Toxicity Report Form- Chronic Pass/Fail and Acute LC50 Date
Facility O(A- l 11 NPDES#NC Pipe # C?)I County
Laboratory Performing Test r, izn Comments UA I 1 t�=4 -C
of Operator
Signature of LaboratorK*9 rvisor 61 I
MAIL ORIGINAL TO- Div.ironmental ofWaterQu Sciences
Branch
N.C. DENR
1621 Mail Service Center
North Carolina Ceriodaphnia Chronic Pass/Fail Reproduction Toxicity Test Raleigh, North Carolina 27699.1621
CONTROL ORGANISMS 1 2 3 4 5 6 7 8 9 10 11 12 . I Chronic Test Resuits
Calculated t
# Young Produced Tabular t
Reduction
Adult (L )ive (D )ead
Effluent% '.1
TREATMENT 2 ORGANISMS 1 2 3 4 5 6 7 8 9 10
9 Young Produced
Adult (L )ive (D )ead
1st sample 1st samole 2nd sample
Control
PH
Treatment 2
s s s
t e t e t e
a n a n a n
r d r d r d
t t t
1st sample 1st sample 2nd sample
Control
D.O.
Treatment 2
LC501Acute Toxicity Test
(Mortality expressed as %, combining replicates) .
M
LC50= � I 00 °/,
95% Confidence Limits
%- %
Organism Tested
DWQ form AT-1 (3/87) rev. 11195
Sample 1
11 12
Control Cv
PASS FAIL
pmoudrp 3rt1 isrn
Check One
Sample 2
Sample Type/Duration
Grab lComo. IDuration
3ampie.1 t/
O
3ampie 2 _
Hardness(mgA) 3�
Spec.Cond.(pmhos) idt.
Chlodne(mgA)
Sample temp. at receipt
Method of Determination
Moving Average ❑ Probit ❑
Spearman Kerber ❑ Other"
Duration
R w a
o 0i
X -n X
U) e. CO
Concentration
Mortality Note; Please
Complete This
���i Section Also
start/end
starVend
7Z
Gs
Control
I.aS
(4
?. KS
li
High
ui'i
.$
Cone.
PH
D.O.

Acute Fish Test-24 Hr Survival
Start Date:
7/19/2011
Test ID:
NCO086517
Sample ID:
Gateway
End Date:
7/20/2011
Lab ID:
TRITEST -NC Lab#016
Sample Type:
Effluent
Sample Date:
7/18/2011
Protocol:
EPAA 91-EPA Acute
Test Species:
PP-Pimephales promelas
Comments:
Cone-%
1
2
Control
1.0000
1.0000
12.5
1.0000
1.0000
25
1.0000
1.0000
50
1.0000
1.0000
75
1.0000
1.0000
100
1.0000
1.0000
Transform: Aresin Square Root
Isotonic
Conc-%
Mean
N-Mean
Mean
Min Max
CVO/0
N
Mean
N-Mean
Control
1.0000
1.0000
1.4120
1.4120 1.4120
0.000
2
1.0000
1.0000
12.5
1.0000
1.0000
1.4120
1.4120 1.4120
0.000
2
1.0000
1.0000
25
1.0000
1.0000
1.4120
1.4120 1.4120
0.000
2
1.0000
1.0000
50
1.0000
1.0000
1.4120
1.4120 1.4120
0.000
2
1.0000
1.0000
75
1.0000
1.0000
1.4120
1.4120 1.4120
0.000
2
1.0000
1.0000
100
1.0000
1.0000
1.4120
1.4120 1.4120
0.000
2
1.0000
1.0000
Auxiliary Tests
Statistic
Critical Skew
Kurt
Normality of the data set cannot be confirmed
Equality of variance cannot be confirmed
Linear Interpolation (200
Resamples)
Point
%
SD
95% CL(Exp) Skew
IC05
>100
IC10
>100
IC15
>100 1.0
IC20
>100 0.9
IC25
>100
IC40
>100 0.8
IC50
>100 0.7
00.6
c
Q 0.5
0.4
0.3
0.2
0.1
0.0
0 50 100 150
Dose %
Page 1 ToxCalc v5.0.23 Reviewed by:

1
Tritest, Inc.
Data Sheet for Acute Definitive Test (24hrs) - Fathead minnow Pimephales promelas
Client:CYx4ew��. NDPES #: NC tx&� Test Organism Source: �zur.�vx
Test Organism: < , P_ a _ Organism Born (Date/Time): )i I,/ I O Age of Organism: N t< Time Fed: 16�13oy
# Replicates per Treatment: _Z Total Organisms per Vessel: i d Test Vessel Size: 53DIL Volume/Vessel: PG -
Dilution Water Batch: SSit'S�
Start Date: A(Rilk
End Date: A 2,,'�,L__
Comments:
Temperature: Q6.2
Time: IQ
Time: .�
Randomized: ✓
Analyst: ?8C-
Analyst: DBL
Incubator: 'M --�-
Reviewed by:

Tritest, Inc.
Bioassay Chain of Custody Form
Facility Name: 2g 6ci�-_W*x
Address: F O. Box
Phone # .3 7 (cc5 O
Contact
County : mecate.ti Sr NPDES permit # pipe:
% Effluent Dilution (IWC): Test Method: .5s
Plant Flow:
Sample Collector: print
signature
Sample Type:
Composite
Date Started Time: AM Qr PM
Date Ended Time: AM or PM `
Samples per Hr: # Hrs:
Grab
Date: JI�ZltTime: J� AM or PM
Sample Volume: Chilled during Collection? Yes or No
Method of Transportation to the Lab:
Chain of Custody Release
Relinquoi he
Received By
imam
IN. WWI
Work Order Number Lo I -dIq-73 Received By:
Receiving Temperature:
For Laboratory Use Only
Residual Chlorine: COMMENTS:
Conductivity: �,?,2q.g� &p
pH:
# of Bottles
TriTest, Inc. Address: 6701 Conference Or., Raleigh, NC 27607 Phone: [phone]
0

Z3
Chain of Custody(�5aceAnalyAcal-
%-mv.pacvMb1q.00M
•.,__�___�_� L1_ Y_. MCI 1 ICAI'i'
Results Reauested 7/25/2011
-
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:'Re
Kevin Godwin
P.O. C l�.5 f�� (Z-
Pace Analytical Charlotte
4-
9800 Kincey Ave. Suite 100
Huntersville, NC 28078
Phone [phone]
Email: [e-mail]
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`.4onday, July 18, 2011 4:21:42 PM FMT-ALL-C-002rev.00 24Marcnzuuu Page 1 of

CHARLOTTEmi
August 10, 2011
Mr. Hunter Hicks
AMEC Environment and Infrastructure
Dear Mr. Hicks,
This letter is in response to your request of August 2, 2011 to discharge treated groundwater to the Charlotte -Mecklenburg Utilities'
(CMU) sanitary sewer on behalf of the owners of the Gateway Village located at 800 West Trade Street, Charlotte, NC.
The City of Charlotte Sewer Use Ordinance prohibits discharge of groundwater in Section 23-79 (b)(14) "....unless specifically
authorized by CMU". At this time CMU-System Protection (SP) is unable to grant discharge privileges.
When staffing levels allow, CMU has issued Local Control Document s (permits) for long tern remediation projects in the past. The
permit acts as a control mechanism for monitoring non -domestic discharges into the sanitary serer. However, hi more recent history,
CMU-SP has required other groundwater remediation projects to obtain NPDES permits.
CMU-SP understands you are requesting discharge to the CMU system to reduce costs for your client. For information purposes,
based upon typical remediated groundwater discharges, we would anticipate the following costs associated with discharge to the CMU
system:
• Due to flow volume and concentration levels of organic compounds discharge would require continued treatment and testing
on a regular basis under a permit with CMU.
• The flow would have to be metered.
• The standard sewer charge of $4.14 per CCF would apply along with Industrial Waste Control Charge of $0.24 per CCF.
• In addition high strength charges may apply based upon monitoring performed.
However, as stated previously, we are unable to issue a permit and accept the groundwater discharge at this time.
If you have any questions you may contact me at 704-336-4636 or Tim Downs at 704-336-5042.
esp c ull ,
Bill Gintert
Environmental. Compliance Manager
System Protection
Environmental Management Division
Charlotte -Mecklenburg Utilities
System Protection 4222 Westmont Drive Charlotte, NC 28217 Phone: [phone] Fax: [phone]
Charlotte -Mecklenburg Utilities

SOC PRIORITY PROJECT: Yes No X
To: Western NPDES Program Unit
Surface Water Protection Section
Attention: Ron Berry
Date: April 12, 2011
NPDES STAFF REPORT AND RECOMMENDATION
County: Mecklenburg
Permit No. NCO086517
PART I - GENERAL INFORMATION
1. Facility and Address: Gateway Village, LLC c/o Cousins Properties, Inc.
800 West Trade Street
Charlotte, North Carolina 28034
2. Date of Investigation: March 30, 2011
3. Report Prepared By: Samar Bou-Ghazale, Env. Engineer II
4. Persons Contacted and Telephone Number: Mr. Hunter Hicks, with MACTEC, Tel#
[phone].
5. Directions to Site: From the intersection of I-77 and West Trade Street, travel west on
West Trade Street to the 800 block. The facility is located in the basement of the 800
West Trade building.
6. Discharge Point(s). List for all discharge points:
Latitude: 350 14' 03" Longitude: 80° 51' 03"
Attach a U.S.G.S. map extract and indicate treatment facility site and discharge point on
map.
USGS Quad No.: G 15 NE
7. Site size and expansion are consistent with application? 4cl
Yes X No If No, explain:8. Topography (relationship to flood plain included): The facility is locn ` e
underground parking area of the building. o
9. Location of nearest dwelling: This facility is located in the parking area of

building in downtown Charlotte.
10. Receiving stream or affected surface waters: Irwin Creek
a. Classification: C
b. River Basin and Subbasin No.: Catawba and 03-08-34
C. Describe receiving stream features and pertinent downstream uses: Discharge
into a Charlotte storm drain system. The receiving stream is approximately 10- 20
feet width and ranges from 6" to 3' in depth.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 0.05 MGD (Ultimate Design Capacity).
b. What is the current permitted capacity of the wastewater treatment facility? 0.05
MGD.
C. Actual treatment capacity of the current facility (current design capacity)? 0.05
MGD.
d. Date(s) and construction activities allowed by previous Authorizations to Construct
issued in the previous two years: N/A.
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: The existing facilities consist of one transfer tank, one dual
bag filter for sediment filtration, and two 1,000 pound activated carbon canisters
connected in series.
f. Please provide a description of proposed wastewater treatment facilities: N/A.
g. Possible toxic impacts to surface waters: This discharge is known to be toxic in
nature.
2. Residuals handling and utilization/disposal scheme: N/A
a. If residuals are being land applied, please specify DWQ: N/A
b. Residuals stabilization: N/A
C. Landfill: N/A
d. Other disposal/utilization scheme (specify): N/A

3. Treatment plant classification (attach completed rating sheet): Class I.
4. SIC Code(s): 5541
Primary: 02 Wastewater Code (s): 22
Main Treatment Unit Code: 42018
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? N/A.
2. Special monitoring or limitations (including toxicity) requests: Toxicity should be limited.
3. Important SOC, JOB or Compliance Schedule dates: (please indicate) N/A.
4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge
options available. Please provide regional perspective for each option evaluated.
Spray Irrigation: N/A.
Connection to Regional Sewer System: Not evaluated.
Subsurface: Not evaluated.
Other Disposal Options: N/A
5. Air Quality and/or Groundwater concerns or hazardous materials utilized at this facility
that may impact water quality, air quality or groundwater? No air quality concerns.
groundwater is impacted already.
6. Other Special Items: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
Cousins Properties, Inc., is applying for Permit to discharge from its facility Gateway
Village located in Charlotte. The facility consists of office/retail complex. Prior to construction
in 1990, a portion of the site was occupied by commercial developments that included a gasoline
station, restaurant and meat processing facility. During the construction of the existing building,
a portion of the site was identified as impacted by petroleum and chlorinated compounds. The
finished grade elevation for the underground service structure for this building is approximately 5
to 8 feet below the static groundwater level. A permanent dewatering system was designed for

the site that incorporated, an injected slurry wall in combination with an under -drain system. The
purpose of the slurry wall was to impede the migration of contaminant from one side to the other.
Two sump pumps were installed on either side of the slurry wall. Discharge from sump 1 was
permitted in July 2001 since it was identified by being contaminated. Sump 2 was installed on the
un-contaminated side of the slurry wall and the discharge was considered allowable.
No flow from sump 1 has been reported on the DMR since 2006 and the permit was not
renewed after it was expired in May 31, 2010. Recently, as apart of a LEED green initiative,
Cousins Properties proposed using reclaimed groundwater for use in the cooling system. In
January 18, 2011, MACTEC conducted groundwater quality sampling from sump 2(supposedly
clean) and found it to be contaminated with Chloroform, cis-1, 2 Dichloroethene and
Tetrachloroethene. Discahrge from sump 2 was directed to the existing remediation system and
the effluent was noted as being ND for all three contaminants. According to MACTEC, sump 1
continued to remain at low water levels that did not trigger the need to pump. Both pumps are
now directed to existing treatment system. The existing treatment system was constructed to
accommodate flows up to 50gpm. Sump 1 has not produced water for several years and sump 2
has an observed flow rate of between 1-3 gpm according to MACTEC. Based on the above,
Cousins properties, Inc., is requesting renewal of the permit. Raleigh has approved the renewal
application.
Pending review and approval by the Western NPDES Program Unit, It is
recommended that the NPDES permit be renewed as requested.
Signature of Rep P parer
Water Quality Regional Supervisor
Date

I R 4,1 W C a r�I e
J A 14 a,�
engineering and constructing a better tomorrow
February 3, 2011
Mr. Bradley Bennett
N.C. Department of Environmental and Natural Resources
Division of Water Quality
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: NPDES Permit Application
Gateway Village
800 West Trade Street
Charlotte, North Carolina
MACTEC Project: 6228-10-5369
Dear Mr.Bennett:
FEB 2 4 2011
Enclosed please find three copies of a completed National Pollutant Discharge Elimination System
(NPDES) Permit Application - Short Form C-GW for the subject property (Attachment A). This
application is being submitted on behalf of Gateway Village, LLC c/o Cousins Properties, Inc. (Cousins
Properties) by MACTEC Engineering and Consulting, Inc. (MACTEC).
Background Information
The subject site, Gateway Village office/retail complex, is located between West Trade Street and West
Fifth Street (Figures 1 and 2 in Attachment B) in downtown Charlotte. Prior to construction of Gateway
Village in the late 1990's, portions of the site were previously occupied by commercial developments
which included a gasoline station, restaurant, and a former meat processing facility. During construction
activities, groundwater in portions of the site was identified as impacted by petroleum and chlorinated
compounds.
In 1998, Gateway Village was authorized by Charlotte -Mecklenburg Utilities to discharge remediated
groundwater from de -watering operations during construction efforts. The finished grade elevation for the
underground service structure for Gateway Village's building at 800 West Trade Street is approximately 5
to 8 feet below the static groundwater level. A permanent dewatering system was designed for the site
that incorporated an injected slurry wall in combination with an under -drain system. The purpose of the
slurry wall was to minimize the amount of dewatering required during excavation and construction
activities and to impede migration of contaminated groundwater into the underground service structure
area from on -site and off -site sources.
Gateway Village, LLC, on behalf of Cousins Properties, was authorized to operate a 0.05 MGD
dewatering treatment system at the site in July 2001. Treated water from the treatment system would
discharge into Irwin Creek (via stone sewer) under NPDES Permit NC0086517. The dewatering
treatment system was designed to treat petroleum and chlorinated contaminated groundwater from Sump
1 in the southeastern portion of the site. MACTEC, on behalf of Gateway Village, LLC, designed and
supervised construction of the dewatering treatment system, has performed operations and maintenance of
the treatment system, provided an Operator in Responsible Charge (ORC) to supervise system operations,
MACTEC Engineering and Consulting, Inc,
2801 Yorkmont Road, Suite 100 • Charlotte, NC 28208 • Phone: [phone] • Fax: [phone]
www.mactec.com
&Oned,Fifl�fmlmnmenmlly-Rerry+nTlA(e Pmdun.
P(eyeRmele'

NPDES Permit Application
Gateway Village — Charlotte, North Carolina
MACTEC Project: 6228-10-5369
February 3, 2010
and prepared monthly Discharge Monitoring Reports (DMRs) since 2001. Due to prolonged dewatering
system inactivity as a result of no flow through the system, the permit was not renewed after it expired on
May 31, 2010.
Sump 1 is located within the building hydraulically up -gradient of the slurry wall. It was designed to
collect groundwater from the under -drains used to dewater the site's underground structures in the
southeastern portions of the 800 block between West Trade Street and West Fifth Street. The impacted
groundwater would be pumped to the treatment system before discharge to the storm system. Since the
slurry wall was installed at the site, groundwater levels in the sump have not triggered the high level
pump switch.
Sump 2 is located adjacent to the dock office hydraulically down -gradient of the slurry wall. It was
designed to dewater the site's underground structures located in the northwestern portions of the 800
block between West Trade Street and West Fifth Street. The northwestern portion of the 800 block
between West Trade Street and West Fifth Street was previously identified as "uncontaminated".
Considered an "allowable non-stormwater discharge", uncontaminated groundwater from Sump 2 could
be discharged to the storm system without treatment or a NPDES permit.
In 2010, Cousins Properties proposed using reclaimed groundwater as a non -potable water supply for the
site as part of a LEED green initiative. Cousins Properties requested an investigation of the potential to
use components of the current dewatering and remediation system (i.e. sumps, pumps, piping, holding
tank, and filters) for this purpose. In December 2010, plumbing retrofit designs were completed for the
proposed use of groundwater for alternative uses at the site, specifically for use in the cooling system.
Assessment Activities
On January 18, 2010, MACTEC conducted groundwater quality sampling of the groundwater from Sump 2
(Influent). Groundwater from Sump 1 continued to remain at low water levels that did not trigger the need
to pump from the sump. During the sampling event, Cousins Properties was testing the plumbing retrofits
and groundwater from Sump 2 was pumped through the remediation system. MACTEC collected an
effluent sample after the groundwater was pumped through the system to assess the continued remediation
efficiency of the system. The influent and effluent samples were analyzed for volatile and semi -volatile
organic compounds using EPA Method 624/625 as well as Lead by EPA Method 200.7 and Phenol by
EPA Method 420.4. The results of the influent and effluent sampling are summarized below. The
laboratory analytical report is provided in Attachment C.
Table 1: Summary of Influent/Effluent Analytical Results
Constituen
FINFLUENT
EFFLUENT
Chloroform
5.6
ND
cis-1,2-Dichloroethene
5.0
ND
Tetrachloroethene
58.8
ND
Notes: Prepared by: 41h *
s-sT
1. Concentrations in µg/L Checked by: JAq_, s, J I t
2. ND is below laboratory
detection limits.

NPDES Permit Application
Gateway Village — Charlotte, North Carolina
MACTEC Project: 6228-10-5369
Conclusions
February 3, 2010
The sampling results identified chlorinated solvents in the influent sample from Sump 2. Since the
sampling results indicate that groundwater from Sump 2 has been impacted by chlorinated solvents,
Cousins Properties is requesting a NPDES permit for treatment and discharge of the groundwater to the
stormwater system.
No compounds were identified above laboratory detection limits in the effluent sample. Based on the
results of the sampling, it appears that the remediation system will effectively treat the groundwater at the
site. The plumbing system will be retrofitted to pump groundwater from both Sumps 1 and 2 through the
remediation system prior to use at the site for the cooling tower and potentially discharge, if necessary
based on the quantity used by the cooling tower, to the stormwater system.
The groundwater quantity and quality both for influent to and effluent from the remediation system will
remain similar to the permitted discharge under NPDES Permit NC0086517. The difference is that
groundwater from both Sumps 1 and 2 will be pumped through the system whereas the system was
previously only connected to Sump 1. MACTEC anticipates that groundwater levels in Sump 1 will
continue to remain low enough not to trigger the high level pump switch. Therefore, the current 0.05
MGD dewatering system consisting of a 700-gallon holding tank, dual bag filters, dual 1,000-pound
activated carbon canisters, and effluent flow meter is sufficient and a new NPDES permit, similar to
NPDES Permit NC0086517 is requested per the attached application. A copy of the previous permit is
included in Attachment D.
If you have questions concerning this report, please contact the undersigned at [phone].
Sincerely,
MACTEC ENGINEERING AND CONSULTING, INC.
Hunter M Hicks E.I. re ark, .G.
Staff Engineer Principal Geologist
Attachments
A- Permit Application
B- Figures
C- Laboratory Analytical Report
D- Previous NPDES Permit NC0086517

27
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MOTs i
Source: USGS 7.5-Minute Topographical Map, Derita, North Carolina Quadrangle, dated 1994
Q Site Location * Discharge to Stream
0 500 1,000 2,000 3,000 4,000
Feet
OMACTEC SITE LOCATION
800 WEST TRADE STREET
IN-jCHARLOTTE, NORTH CAROLINA
PREpp1�R D D T CHECKED DATE JOB NUMBER FIGURE
By
H n )� By A- p >, 6228-10-5369 1

Source: POLARIS MECKLENBURG COUNTY 2009
Q Site Location * Storm Sewer Discharge Location
0 125 250 500 750 1,000
Feet
/J��MACTEC AERIAL PHOTOGRAPH
800 WEST TRADE STREET
CHARLOTTE, NORTH CAROLINA
BY"=4 I V L/ 3 //I IBYcL,� 1 Ivnic/ 5 r I% Iwo rvLimo�rt 6228-10-5369 Irluumc 2