HomeMy WebLinkAboutNCG030246_BENCHMARK EXCEEDANCE NOTIF_20191211CORNING
December 10, 2019
Ahmed Koilakh Hickory Manufacturing and t 828-901-5609
Plant Manage, Technology Center f 828-9015665
1164 A 231d St Sr ahmed.koilaktrCcomin9.com
Hickory. NC 28602 w .Wrnin9.com
Mr. Zahid Khan
Regional Engineer, Mooresville Regional Office
Division of Energy, Mineral, and Land Resources
610 East Center Avenue, Suite 301
Mooresville, NC 28115
RE: Stormwater Discharge Benchmark Exceedance
Certificate of Coverage No. NCG030246
111"' Tu ri"TTi l
RECEIVE®
DEC 11 2019
DENR-DEMLR
Land Quality Section
Mooresville Regional Office
The Coming Optical Communications — Hickory Manufacturing and Technology Center
(HMTC), located at 1164 231d Street SE, Hickory, NC, currently operates under General
Permit No. NCG030000 with respect to its stormwater discharges, as evidenced by Certificate
of Coverage No. NCG030246. Analytical results from Outfall # 3 have exceeded the
benchmark values for copper and zinc, and analytical results from Outfall # 5 have exceeded
the benchmark value for copper, such that the facility is subject to Tier Three requirements
under Part 11, Section B of General Permit No. NCG030000.
HMTC is in the process of conducting further investigation to identify potential sources of
these compounds and to develop methods to reduce their concentration in stormwater
discharge. HMTC previously installed filters on drain inlets leading to Outfall # 3 to reduce
the total suspended solids content, which resulted in a reduction in the metals concentration of
subsequent monitoring events, although not below the benchmark values. A new filter ivas
recently installed that is designed to remove both solids and metals, which has resulted in a
further reduction of zinc and copper levels. The facility will continue to monitor both
stormwater outfalls on a monthly basis, as required under Tier Two monitoring, and will
further evaluate what additional controls may be necessary.
Please contact me if you have any questions at 828-901-5699.
Sincerely,
1
V
Ahmed Koilakh
Plant Manager
cc: Kim Kelley
Steve Street
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