NCG120101_Letter RE NCG12 Renewal Guidance_20180913

f = DUKE
ENERGY.
File: Mayo 12520-R
Ms. Bethany Georgoulias
North Carolina Division of Environmental Quality
1628 Mail Service Center
Raleigh, NC 27699-1628
Subject: Duke Energy Progress, LLC.
Mayo Electric Generating Plant
NPDES General Permit Renewal Guidance
NCG120101
Dear Ms. Georgoulias:
Duke Energy
2500 Fairfax Road
Greensboro, NC 27407
RECEIVED
SEP 13 2010
8T0 til; ATFR�'ALPTy
R"TTING
As recently discussed, Duke Energy requests guidance and clarification on the renewal of the
NCG 120101 general stormwater permit for the Mayo Steam Plant Monofill. The initial certificate of
coverage was issued to Duke Energy on January 6, 2014. Coverage under this general permit was issued
with amended conditions requiring additional sampling. Please advise if the renewal of the general permit
will continue to require this augmented sampling schedule.
The NCG120101 has been problematic with the requirement to monitor fecal coliform due to the
abundant wildlife around the monofill. Duke Energy sought and received tier relief from monthly
monitoring of fecal coliform from DEQ in December of 2017. Unlike the sanitary landfills the
NCG12000 permit was developed for, the Mayo Monofill receives only coal combustion residuals with
wildlife being the only possible source of fecal contamination.
Duke Energy plans to request a modification of NPDES Industrial Stormwater Permit NCS000580 in the
near future to include the three stormwater outfalls at the Mayo Monofill currently covered by permit
NCG120101. The industrial activity at the monofill, transport of materials, is similar in nature to the
activity at the Station's stormwater outfall 010.
As you requested, included with this correspondence is all stormwater sampling data gathered under
permit NCG120101 to date from the Mayo Monofill for your review. Should you have any questions
please contact me at Lori.TollieCtvduke-energv.com or at 1-336-854-4916.
Sincerely,
Lori Tollie

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