NCG030650_Email RE Cu Zn Sep 2022 Exceedances_20221027

Georgoulias, Bethany
From: Nicole Johnston <[e-mail]>
Sent: Thursday, October 27, 2022 3:24 PM
To: Carson, Brittany; Georgoulias, Bethany; Young, Brianna A
Subject: [External] FW: Stormwater exceedances for Copper and Zinc for NCG030650 for
September 2022 CommScope Claremont (Please note Bucket Sampling results)
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Bethany,
Oops — sent a little early — still correcting some mistakes .... so use this for the reporting requirement to NCDEQ please for
exceedances for September for CommScope Claremont (NCG030650). I also sent you another notice for exceedances
for August 2022 providing that I had amended the eDMR. The eDMR for September will be submitted later today.
Thank you.
Nicole
From: Nicole Johnston
Sent: Thursday, October 27, 2022 3:21 PM
To: 'Georgoulias, Bethany'<[e-mail]>; Carson, Brittany <[e-mail]>; Young,
Brianna A <[e-mail]>
Subject: Stormwater exceedances for Copper and Zinc for NCG030650 for September 2022 ope Claremont (Please note
Bucket Sampling results)
Per the general permit for CommScope, Inc. (NCG030000) Claremont Facility (under COC NCG030650), sampling was
completed on ROS Outfall 003 for the site on Friday, September 30th, 2022 with a rainfall even totaling 1.99" of rain. I
received results from the laboratory (Statesville Analytical) on Tuesday, October 25th, 2022. For this event, all
parameters were below the benchmark EXCEPT for Copper and Zinc. Please note that following:
1) The benchmark for Copper under General Permit NCG030000 is 0.010mg/L. The result obtained for Copper for
Outfall 003 was 0.079 mg/L, which exceeded the benchmark of 0.010 mg/L.
2) The benchmark for Zinc under General Permit NCG030000 is 0.126 mg/L. The result obtained for Copper for
Outfall 003 was 0.25 mg/L, which exceeded the benchmark of 0.126 mg/L.
3) However, I grabbed a rainwater sample on that same day in a small bucket and had copper, lead, and zinc
analyzed as well. The results from the analyses obtained for the stormwater bucket sample were the following:
Copper: 0.005 mg/L
Lead: <0.0005 mg/L
Zinc: 0.015 mg/L
4) The rainwater sample was utilized to try and investigate background levels and determine other influences on
benchmark exceedances. These results (as for last month) do provide some background levels to consider for the
copper and zinc benchmark exceedances.
5) It is worth noting at the time of these exceedances, the facility was still undergoing some construction for some
new storage buildings (as state for last month). These buildings were constructed right beside the outfall site, and due

to displaced metal being moved near the construction site for temporary purposes, this may have led to the metal
exceedances.
6) These benchmark exceedances for copper and zinc will be documented in the SWPPP, and corrective action
steps will be implemented to reduce such occurrences. Furthermore, best management practices will be utilized to
assist with reductions for the metal parameters exceeding their respective benchmark values.
Please note that rainfall totals for the Claremont CommScope site are obtained from the National Weather Service.