NCG020251_Upset_20240412

upipan
April 12, 2024
Central Files
Stormwater Permitting Program
1617 Mail Service Center
Raleigh, North Carolina, 27699-1617
RE: Vulcan Materials Company- Boone Quarry
COC No. NCG020251
Unanticipated Upset for Stormwater
To Whom It May Concern:
In accordance with Part C.9 of General Permit NO. NCG020000, Vulcan Materials Company,
LLC (Vulcan) is submitting notification within the 7 days of an upset condition that occurred
during an April 9, 2024 storm event.
On the morning of April 9, 2024, Vulcan became aware of an upset condition causing an
overflow of stormwater one of the facility's sedimentation ponds and subsequent discharge from
the site to the Laurel Fork Creek. Vulcan determined that the pump float switch at our pond
near the ABC stockpile malfunctioned causing the stormwater overflow. Vulcan initiated
corrective action and repaired the pump early that afternoon (i.e., within 8 hours of detection).
The discharge from the site was stormwater run-off only as no facility wastewater (e.g.- wash
screen water, etc.) is commingled with that pond. The overflow did not contain any pollutants
other than particulates.
Vulcan also discussed the issue with Jack Lawry-Popelka, Engineer II with NC Department of
Environmental Quality on the morning of April 10t", within 24 hours of detection of the upset
condition.
If you have any questions about the above information, please contact James Bear, Plant
Manager at 828-963-7100 or myself at 704-547-7076.
Sincerely,
Tony Johnson
Environmental Engineer
cc: Tamera Eplin, DEQ WRO via email
James Bear
CHARLOTTE REGIONAL OFFICE—VULCAN CONSTRUCTION MATERIALS,L.L.C.
11020 David Taylor Drive,SUITE 400,CHARLOTTE,NC 28262,TELEPHONE [phone],FAX [phone]