NCG020082_TIER I_20230630

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Via email
June 30, 2023
Tamera Eplin, PE
Regional Engineer, Land Quality Section
NCDEQ Winston Salem Regional Office
450 West Hanes Mill Road, Suite 300
Winston-Salem, NC 27105
RE: Vulcan Materials Company- North Quarry
COC No. NCG020082
Pit Outfall 001
Ms. Eplin:
In accordance with General Permit NO. NCG020000 Vulcan Materials Company, LLC(Vulcan) is
submitting notification within the two weeks of receipt(June 20, 2023) of analytical results indicating an
exceedance of a benchmark value as outlined in Part F Table 2 and Section F-5. In this case our Outfall
001 turbidity results indicated a result of 72.2 NTU.
Vulcan is in the process of implementing the Tier One response requirements for turbidity exceedance,
in as detailed in Part F,Table 5 of General Permit No. NCG020000. On June 29, 2023, Robert Slade,
Brooks Morrison of Vulcan and myself attempted to identify and evaluate the possible causes of the
benchmark exceedance on June 7, 2023. From this evaluation, we believe that the source of the higher
turbidity may have been from the series of rock check dams within the pit. Pit water is controlled
through the use of check dams, leading the pit sump. Vulcan will removing the sediment build up
around the inlet and rock check dams. The facility plans to take another sample once work has been
completed.
Documentation of all responses and corrective actions performed in accordance with the Tier One
requirements for turbidity will be maintained with the facility's Stormwater Pollution Prevention Plan.
If you have any questions about the above information, please contact Brooks Morrison, Plant
Supervisor at 443-252-5439 or me at 704-547-7076.
Sincerely,
d/ 12/ '--
Tony Johnson
Environmental Engineer
cc: Brooks Morrison
CHARLOTTE REGIONAL OFFICE—VULCAN CONSTRUCTION MATERIALS, L.L.C.
11020 David Taylor Drive,SUITE 400,CHARLOTTE, NC 28262,TELEPHONE [phone], FAX [phone]