NC0090000_Report_20240202

Colonial Pipeline Company
Jeff Morrison
Environmental Program Manager, Remediation
January 29, 2024
Ms. Brandy Costner
North Carolina Department of Environmental Quality
Division of Water Resources — Mooresville Regional Office
610 East Center Avenue, Suite 301
Mooresville, NC 28115
RECEIVED
FB 02
NCDEQ/DWR/NPDES
Re: Site Mitigation Plan Quarterly Report 4Q 2023 (October 2023 - December 2023)
Colonial Pipeline Company — 2020-L1-SR2448 / Pipeline ROW Release
NPDES Permit No. NCO090000
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.(ii) effective August 1, 2023, Colonial Pipeline Company (Colonial) is
submitting this Site Mitigation Plan Quarterly Report 4Q 2023 for the time period of October 2023
— December 2023 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 finalizing the requirements to the civil and
landscaping plans to obtain the necessary approvals for site development. Upon finalization of
the site development plans, Colonial will submit the final Site Mitigation Plan to the North Carolina
Department of Environmental Quality / Division of Water Resources as per NC0090000, Section
A.9.b.(i). Colonial anticipates that the next quarterly report (Site Mitigation Plan Quarterly Report
1 Q 2024) will be submitted in April 2024.
If you have any questions or concerns regarding the attached Site Mitigation Plan Quarterly
Report 4Q 2023, 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: 0 0 0 0

TR114 Edinburgh S. Drive, Ste. 200 T 919.827.0864
ICCary, NC 27511 TRCcompanies.com
January 25, 2024
Jeff Morrison
Environmental Program Manager, Remediation
Colonial Pipeline Company
3925 Anderson Farm Road
Austell, Georgia 30106
Subject: Colonial Pipeline SR 2448/Pipeline ROW
NPDES Permit No. NC0090000
Site Mitigation Plan Quarterly Report 4Q2023
Huntersville, North Carolina
Dear Mr. Morrison:
This Quarterly Site Mitigation Report for reporting period October 2023 — December 2023 (4Q2023) has been
prepared as required by National Pollution Discharge Elimination System (NPDES) Permit No. NC0090000,
Section A.9.b.(i) for the Colonial Pipeline Company (CPC) Huntersville-Concord Road (State Road 2448 [SR 2448])
pipeline release site located near Huntersville, Mecklenburg County, North Carolina (Site).
The on -site groundwater treatment system construction has not yet begun and is therefore not operational at
this time. As such, there are no nuisance conditions (noise, odor, or vapors) as a result of groundwater
treatment that need to be mitigated at this time.
As required by the Town of Huntersville (Town), a series of figures were submitted to the Town on November
14, 2023 to obtain the necessary permits and approvals for site development, including assemblage of the
groundwater treatment components that are required to comply with NPDES Permit NC0090000. The
November 14, 2023 submittals to the Town included the following:
■ Proposed Site Plan — Depiction of existing features, proposed groundwater treatment system location,
proposed stormwater control measures, and proposed landscaping areas.
■ Grading and Drainage Plan 1 — Depiction of proposed drainage features and construction specifications for
the southeast portion of the Site.
■ Grading and Drainage Plan 2 — 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 — Depiction of proposed drainage features and construction specifications for
the south-central portion of the Site.
■ Turning Movement Analysis — Depiction of tanker truck movement analysis for loading and unloading at the
Site.
■ Overall Site Plan — Depiction of proposed vegetative planting areas throughout the Site.

Mr. Morrison
Colonial Pipeline Company
January 25, 2024
Page 2
On December 6, 2023, CPC was notified by the Town that modifications to some of the above -listed figures were
necessary. Upon receiving the Town's December 6 modification request, CPC requested an in -person meeting
with the Town to discuss the requested modifications.
A meeting between the Town and CPC to discuss the requested modifications occurred on January 10, 2024.
Based upon that meeting, a revised drawing set is currently being prepared and will be submitted to the Town
for approval in the near future. Upon receipt of the Town's approval of the modified submittals, the Site
Mitigation Plan originally submitted to the North Carolina Department of Environmental Quality (NCDEQ) on
September 29, 2023 will be amended with final versions of the above listed drawings, and the Revised Site
Mitigation Plan will be submitted to NCDEQ.
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,
TRC Environmental Corporation
Chelsea Macionus
Project Manager
or TIRC