NC0090000_Site Mitigation Plan_20231002

Colonial Pipeline Company
JeffMorrison RECEIVED
Environmental Program Manager, Remediation
September 29, 2023 :c 0 2 2023
Via Email Delivery NCDEQIDWRINPDES
North Carolina Department of Environmental Quality
Division of Water Resources—Water Quality Permitting Section NPDES
1617 Mail Center Service Center
Raleigh, NC 27699-1617
Re: Site Mitigation Plan
Colonial Pipeline Company—2020-L1-SR2448/ Pipeline ROW Release
NPDES Permit No. NC0090000
Huntersville, Mecklenburg County, North Carolina 28078
To Whom it May Concern,
As required by National Pollution Discharge Elimination System (NPDES) Permit No.
NC0090000, Section A.9.b.(i) effective August 1, 2023, Colonial Pipeline Company (Colonial) is
submitting this Site Mitigation Plan in connection with the Huntersville-Concord Road (State Road
2448 [SR 2448]) pipeline release located in Huntersville, Mecklenburg County, North Carolina.
At the time of this submittal,the Town of Huntersville and Colonial are discussing the requirements
to finalize the plans to obtain the necessary approvals for site development. Upon finalization of
the site development plans, Colonial will submit the final plans to the North Carolina Department
of Environmental Quality/ Division of Water Resources.
If you have any questions or concerns regarding the Site Mitigation Plan, please do not hesitate
to contact me at (770).819.3566.
Respectfully,
Jeff D. Morrison
3925 Anderson Farm Road,Austell,Georgia 30106
colpipe.com I Follow us: 0000

1% TR c 114 Edinburgh S.Drive,Ste.200 T 919.827.0864
�, Cary, NC 27511 TRCcompanies.com
September 27, 2023
Jeff Morrison
Environmental Program Manager, Remediation
Colonial Pipeline Company
3925 Anderson Farm Road,
Austell, Georgia 30106
Re: Colonial Pipeline SR 2448/Pipeline ROW
NPDES Permit No. NC0090000 Site Mitigation Plan
Huntersville, North Carolina
Dear Mr. Morrison:
Enclosed is a draft version of the proposed Site Mitigation Plan (SMP) as required by National Pollution Discharge
Elimination System (NPDES) Permit No. NC0090000, Section A.9.b.(i) for the (CPC) Huntersville-Concord Road
(State Road 2448 [SR 2448]) pipeline release site located near Huntersville, Mecklenburg County, North Carolina
(the Site).
The enclosed drawings have been developed by TRC Environmental Corporation (TRC) and AECOM Technical
Services for Colonial Pipeline Company (CPC) and for submittal to the Town of Huntersville (the Town)to obtain the
necessary permits and approvals for site development. Included in the enclosed drawings being submitted as the
SMP are the following items:
• Proposed Site Plan (Sheet 12)—Depiction of existing features, proposed groundwater treatment system location,
proposed stormwater control measures, and proposed landscaping areas.
• Grading and Drainage Plan 1 (Sheet 13)—Depiction of proposed drainage features and construction specifications
for the southeast portion of the Site.
• Grading and Drainage Plan 2(Sheet 14)—Depiction of proposed drainage features and construction specifications
for the portion of the Site south of Huntersville-Concord Road and north of the groundwater treatment system.
• Grading and Drainage Plan 3(Sheet 15)—Depiction of proposed drainage features and construction specifications
for the south-central portion of the Site.
• Turning Movement Analysis(Sheet 15D)—Depiction of tanker truck movement analysis for loading and unloading
at the Site.
• Overall Site Plan (Sheet LOU)—Depiction of proposed vegetative planting areas throughout the Site.
No nuisance conditions resulting from the operation of the groundwater treatment system such as noise, odor, or
vapors are anticipated to be present at the Site; consequently, no additional mitigation measures are planned to be
installed or implemented at this time.
Please be advised that the enclosed plans are marked as"Draft" as they are being discussed with the Town. Further
edits based on comments from the Town may be necessary before the enclosed plans are considered final. Finalized
copies of the plan drawings will be provided to the Division of Water Resources once approval is received from the
Town.
Should you have any questions or require additional information, please do not hesitate to contact me at (845)-853-
5388 or by e-mail at [e-mail]
Sincerely,
Chelsea Macionus
Project Manager

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