NCG030246_Tier Response Email_20191210

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties
From: Street, Steve L. [mailto:Steve.Street corning.com]
Sent: Tuesday, December 10, 2019 3:55 PM
To: Khan, Zahid <[e-mail]>
Cc: Moore, James <[e-mail]>
Subject: [External] Stormwater Discharge Benchmark Exceedance Certificate of Coverage No. NCG030246
Dear Mr. Khan,
The Corning Optical Communications — Hickory Manufacturing and Technology Center (HMTC), located at 1164 23d
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 ll, 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 was 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.
Attached is the letter containing this information signed by the site's Plant Manager. A hard copy of the letter is also
being mailed to your office.
Regards,
Steve Street
Sr. EHS Coordinator
Hickory Manufacturing and Technology Center
(o) 828-901-6695
(c) 828-244-3921

Moore, James
From: Street, Steve L. <[e-mail]>
Sent: Friday, January 17, 2020 4:26 PM
To: Moore, James; Khan, Zahid
Subject: RE: [External] Stormwater Discharge Benchmark Exceedance Certificate of Coverage No.
NCG030246
Attachments: Stormwater DMR Summary.xlsx
Dear Mr. Moore,
Per your request, please find attached a summary spreadsheet containing monitoring data for the last two years. As I
previously referenced, HMTC has retained Wood Environment & Infrastructure Solutions for assistance. Wood is
assisting HMTC with identifying potential means to further reduce the concentration of copper and zinc in the facility's
stormwater effluent. As such, HMTC is not requesting a technical assistance inspection from NCDEQ. As previously
noted, HMTC will continue to conduct monthly monitoring at both outfalls.
Regards,
Steve Street
Sr. EHS Coordinator
Hickory Manufacturing and Technology Center
(o) 828-901-6695
(c) 828-244-3921
From: Moore, James <[e-mail]>
Sent: Wednesday, December 11, 2019 1:18 PM
To: Street, Steve L. <[e-mail]>; Khan, Zahid <[e-mail]>
Subject: RE: [External] Stormwater Discharge Benchmark Exceedance Certificate of Coverage No. NCG030246
Steve we are in receipt of your letter dated December 10, 2019 regarding benchmark exceedances. Since you are
operating under the new NCG030000 permit issued November 2018 you are required to monitor monthly until 3
consecutive sample results are below the benchmark values or until monitoring relief is granted. Please email over a
spreadsheet summarizing monitoring data for the last 2 years. Also, in Q1 next year I should be available for a technical
assistance inspection if requested.
James Moore
Assistant Regional Engineer
Land Quality Division
Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
Phone: [phone] x2138
Fax: [phone]
Email: iames.mooreC�ncdenr.gov

I" 00 t� 0 m 0 m 0 � oo � � r� cD
ri N N 00 c-i cf M
r+ o rn 0 o li OD 0 O O O O
0 0 0 0 0 0
Mlmlm00 N
lNIN lmLn (NI�o C-4 -4 r,4
Ui Ln Ln Ln Ln Ln Ln Ln Ln Ln
Ln I N N I Ln I t-i I N I Ln I r-i I Ln I Ln
O O O O O O O O O O
O O O O O O O O O O
V O O V O O V O V V
OIILl1(c-1IMIc-i(MINI�I'm o0
1p oo rn oo rn M Ln cn � 1p
lD lD I- � Ln t-� lD I lD
©©©©©©©©©m

00
00
00
00
M
Ql
m
m
m
m
1-1
0
rH
0
�
0
N
rH
0
0
r-i
0
rH
0
r-1
0
r-I
0
N
N
N
N
0
0
N
N
N
N
m
N
0
N
N
N
lDD
\
\
\
\
-I\
w
0
lD
Ql
N
N
00
m
rH
rHM
1-1