NCG030078_Email RE Benchmark Exceedances_20220419

Georgoulias, Bethany
From: Nicole Johnston <[e-mail]>
Sent: Tuesday, April 19, 2022 2:29 PM
To: Georgoulias, Bethany; Khan, Zahid; Morman, Alaina; Carson, Brittany
Cc: Graybeal, Chris
Subject: [External] CommScope, Inc. (Certificate of Coverage NCG030078) - Exceedances for
Stormwater for Sampling Event on April 5th, 2022
Importance: High
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Bethany, Zahid, Alaina, and Brittany,
Per the general permit for CommScope, Inc. (NCG030000) — Catawba Facility (under COC NCG030078), sampling was
completed on the following ROS outfalls on April 5t", 2022 with a rainfall event totaling 0.96" of rain: ROS Outfall 003,
004, 005, 006, 008, 009, and 012. For this event all parameters were below the benchmark EXCEPT for the following for
Copper and Zinc:
Outfall No.
Copper, Total
Recoverable (as
Cu)
Benchmark (in
mg/L):
0.010 mg/L
Zinc, Total
Recoverable (as
Zn)
Benchmark (in
mg/L):
0.126 mg/L
003
0.028
0.010
0.168
0.126
004
0.015
0.010
005
0.023
0.010
0.18
0.126
009
0.028
0.010
012
0.026
0.010
0.18
0.126
1) For this facility, we will still conduct some non-stormwater background sampling to further investigate these
exceedances.
2) For this set of samples, we did grab a rainwater sample in a 2.5 gallon bucket that did show a positive result
for copper of 0.006 mg/L.
3) Please note that these exceedances will be documented in the SWPPP, and corrective action steps will be
implemented to reduce them. Furthermore, best management practices will be utilized to assist with this
reduction as well.
Please let me know if you need anything further, and you all have a very blessed day. Thank you for your
assistance with this matter. Please feel free to call me at 336-366-0870 if you need any other information.
Be safe and blessed! Thanks.
Nicole Johnston