NC0090000_Report_20240501

Colonial Pipeline Company
Jeff Morrison RECEIVED
Environmental Program Manager, Remediation
April 29, 2024
Via Email Delivery
North Carolina Department of Environmental Quality NCDEQ/DWR/NPDES
Division of Water Resources — Water Quality Permitting Section NPDES
1617 Mail Center Service Center
Raleigh, North Carolina 27699-1617
Re: Site Mitigation Plan Quarterly Report 1Q 2024 (January 2024 — March 2024)
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 1 Q 2024 for the time period of January 2024
— March 2024 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
2Q 2024) will be submitted in July 2024.
If you have any questions or concerns regarding the attached Site Mitigation Plan Quarterly
Report 1 Q 2024, 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

TRIC
114 Edinburgh S. Drive, Ste. 200 T 919.827.0864
Cary, NC 27511 TRCcompanies.com
April 29, 2024
Mr. 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. NCO090000
Site Mitigation Plan Quarterly Report 1Q2024
Huntersville, North Carolina
Dear Mr. Morrison:
This Quarterly Site Mitigation Report for reporting period January 2024 — March 2024 (1Q2024) 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 the system 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, and March 22, 2024, 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 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.
On April 9, 2024, CPC was notified by the Town that additional modifications were necessary. CPC has discussed
with the Town to discuss the requested modifications and is working to incorporate the modifications.

Mr. Jeff Morrison
Colonial Pipeline Company
April 29, 2024
Page 2
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 as
requested, 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
[phone] or by e-mail at [e-mail].
Sincerely,
TRC Environmental Corporation
Chelsea Macionus
Project Manager
TIRC