NC0031038_Report_20230912

0 Colonial Pipeline Company
Maribeth D. Hughes, PE, CSP
Environmental Specialist
September 9, 2023
Ms. Sydney Carpenter
NCDEQ — Division of Water Resources
Central Office
512 North Salisbury Street
1617 Mail Service Center
Raleigh, NC 27699-1617
Phone: [phone]
e-mail: [e-mail]
RECEIVED
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12: 3
NCDEQ/DWR/NPDES
Re: Colonial Pipeline Company — Charlotte Delivery Facility
NPDES Permit No. NCO031038
Dear Ms. Carpenter:
Colonial Pipeline Company (CPC) owns and operates the facility located at 7524 Kenstead
Circle in Charlotte. The facility is operated under the above -referenced permit number.
As per Footnote 9 to the Table contained in Part 1.A.1 of the subject permit, CPC is required to
submit a plan to reduce the MTBE level within Outfall 010. MTBE was detected within this
outfall in February, March, and April of 2021. The detection levels ranged from 1.0 to 1.5 ug/L,
well below the current NC Surface Water Standard for MTBE of 19 ug/L. Since that time, all
monthly samples from Outfall 010 have been below laboratory method detection limits for
MTBE.
In order to reduce the chances of detecting MTBE in this outfall again, CPC has also been
cleaning the oil -water separator (OWS), which Outfall 010 discharges from, regularly. This
outfall extends the OWS that services the pipeline manifold area. Due to periodic maintenance
activities within that area, the OWS is susceptible to collecting solids which may be impacted by
historical MTBE containing material. Removing that material will eliminate potential releases of
the associated contaminants.
If you require any additional information, please contact me.
Sincerely,
Maribeth Hughes, PE, P
cc: John Wyatt — CPC
Wes Bell - NCDEQ
7524 Kenstead Circle Charlotte, North Carolina 28208 1 www.colpipe.com