NC0089923_Modification_20201030

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Civil & Environmental Consultants,Inc.
October 26, 2020
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NCDEQ Division of Water Resources REC
NPDES Complex Permitting Unit OCT g 0 ?PO
1617 Mail Service Center
Raleigh,North Carolina 27699 NCDEQ/DU
Subject: Permit Revision Request NC0089923
Daily Flow Increase to 0.108 MGD
Charlotte,North Carolina
CEC Project 190-615
On behalf of Charlotte Water, Civil & Environmental Consultants, Inc. (CEC) is requesting the
issuance of a modification to existing NPDES permit NC0089923 for the discharge of treated
groundwater generated from dewatering activities during the Baxter Street sanitary sewer line
construction.
Applicant Information
Charlotte Water
5100 Brookshire Blvd.
Charlotte,North Carolina 28216
Attention: Bill Deal
Phone: [phone]
Email: [e-mail]
Project Location
Baxter Street and McDowell Street
Charlotte,North Carolina
Preparer
Civil &Environmental Consultants, Inc. (CEC)
3701 Arco Corporate Drive Suite 400
Charlotte,North Carolina 28273
Phone: [phone]
Attention: Bruce Reilly, Senior Project Manager
Email: [e-mail]
3701 Arco Corporate Drive. Suite 400 I Charlotte, NC 28273 I p: 980-237-0373 f: 980-237-0372 I www.cecinc.com

NCDEQ -DWR
CEC Project 190-615
Page 2
October 26, 2020
1.0 BACKGROUND
The Subject Property consists of roads and associated right-of-ways along portions of Baxter
Street, South McDowell Street, Morehead Street, Oriole Street, and Lexington Avenue. The
adjoining properties appear to have existed as an urban area, generally developed with a mix of
commercial,residential and undeveloped parcels since at 1929.Previous assessments indicate that
two contaminant plumes have impacted soils and groundwater beneath Baxter Street related to
historic dry cleaning operations (chlorinated solvents) and underground storage tank release.
Investigations as early as 1997 have consistently detected several constituents above the 15A
NCAC 02L.0202 groundwater standards: carbon tetrachloride (CT),tetrachloroethene(PCE),and
trichloroethene (TCE). CEC performed groundwater sampling in March 2019 and found the 15A
NCAC 02L.0202 groundwater and the 15A NCAC 02B surface water standard exceedances for
PCE in wells MW-3s, MW-6, and MW-8s and toluene in well MW-5s (analytical lab results are
attached). The attached site plan indicates the location of the monitoring wells in relation to the
project location.
2.0 PROJECT DESCRIPTION
The project will consist of the construction of a new sanitary sewer line along portions of Baxter
Street and McDowell Street by micro-tunneling. Groundwater from access pits and boreholes will
be pumped out and treated before discharging directly into Little Sugar Creek, part of the Sugar
Creek Watershed. Dewatering and treatment activities are estimated to last approximately twelve
(12) months. The collection, treatment, and discharge of treated groundwater will be terminated
once construction activities performed below the groundwater table are completed.
The construction has required the permitted demolition of bedrock ledges during the construction
of the vertical access shafts. This additional demolition has resulted in an increase in groundwater
flow rate beyond the initially requested flow rate of 25 gpm or 0.036 MGD. The treatment system
is capable of treating up to 100 gpm. The requested modification to the permit is to increase the
permitted daily maximum flow limit to 75 gpm or 0.108 MGD.
3.0 ENGINEERING ALTERNATIVES ANALYSIS
The initial Engineering Alternatives Analysis (EAA) was previously filed with NPDES permit
application dated March 9, 2020. CEC is unaware of new information that warrant the
modification of the March 2020 submittal.
Civil & Environmental Consultants, Inc.

NCDEQ -DWR
CEC Project 190-615
Page 3
October 26, 2020
4.0 CLOSING
If you have any questions or comments please contact Bruce Reilly by phone at 980-260-2130 or
email at [e-mail].
Sincerely,
CIVIL&ENVIRONMENTAL CONSULTANTS, INC.
Clinton Ingram,P.E. Bruce D. Reilly, P.E.
Project Consultant Senior Project Manager
Enclosures: Completed NPDES Form C
cc: Mr. Freddie Young, Sanders Utility
Mr. William Deal, Charlotte Water
Mr. Edward Watson,NCDEQ Mooresville Office
Civil & Environmental Consultants, Inc.

REVISED NPDES PERMIT APPLICATION FORM

NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC0089923
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise,please print or type.
1. Contact Information:
Owner Name Charlotte Water
Facility Name Charlotte Water
Mailing Address 5100 Brookshire Boulevard
City Charlotte
State / Zip Code NC 28216
Telephone Number [phone]
Fax Number ( )
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road Baxter Street
City Charlotte
State / Zip Code NC 28204
County Mecklenburg
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name Sanders Utility
Mailing Address 6801 Brookshire Blvd
City Charlotte
State / Zip Code NC 28216
Telephone Number [phone]
Fax Number ( )
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public El
Page 1 of 3 C-GW 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
5. Products recovered:
Gasoline ❑ Diesel fuel El Solvents ® Other
6. Number of separate discharge points: 1
Outfall Identification number(s) 0001
7. Frequency of discharge: Continuous ❑ Intermittent El
If intermittent:
Days per week discharge occurs: 6 Duration: 12 months
8. Treatment System Design flow 0.108 MGD
9. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Little Sugar Creek N 35 12 40.12 W 80 50 12.91
10. Please list all additives to the treatment system, including chemicals or nutrients, that have
the potential to be discharged.
None
11. Is this facility located on Indian country? (check one)
Yes ❑ No NI
12. Additional Information
All applicants (including renewals):
• A USGS topographical map (or copy of the relevant portion) which shows all outfalls
> A summary of the most recent analytical results (effluent data, if available) containing the
maximum values for each chemical detected
NEW Applicants only:
Engineering Alternative Analysis
• Description of remediation treatment system components, capacities, and removal efficiency
for detected compounds.
• If the treatment system will discharge to a storm sewer, written approval from the
municipality responsible for the sewer.
• A list of any chemicals found in detectable amounts at the site, with the maximum observed
concentration reported for each chemical (the most recent sample must be collected less
than one year prior to the date of this application)
• For petroleum-contaminated sites—Analyses for Volatile Organic Compounds (VOC) should
be performed. Analyses for any fuel additives likely to be present at the site and for phenol
and lead should also be performed.
• For sites contaminated with solvents or other contaminants - EPA Method 624/625
analysis should be performed.
Page 2 of 3 C-GW 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
13. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
William Deal Senior Project Manager
Printed name of Person Signing Title
W /047(202,0
Signature of Applicant Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable
by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18 U.S.C. Section
1001 provides a punishment by a fine of not more than$25,000 or imprisonment not more than 5 years, or both,
for a similar offense.)
Page 3 of 3 C-GW 03/05