NCG030503_Monitoring Report_20200116 (2)

250 Old Murdock Road
ENGINEERED ESC Troutman, NC 28166
SINTERED ATSUMI [phone]
COMPONENTS TECH, LLC www.engsin.com
January 2, 2020
RE: COC- NCG030503
CERTIFIED MAIL/RETURN RECEIPT
NCDEQ Mooresville Regional Office
Division of Water Quality
Attn: Mr. James Moore
610 East Center Avenue - Suite 301
Mooresville, NC 28115
Dear Mr. Moore:
RECEIVED
JAN i � REC'0
Land Quality Section
&�
Enclosed are the results of December 2019 Monthly Storm Water Discharge
Outfall Monitoring Report. After two consecutive tests with pH being out of
range, June and October of 2019, we started monthly sampling per the tiered
responses laid out in our Storm Water Permit. Outfall No. 1 did not flow during
this event. We have exceedances for Copper in Outfalls 2 and 3, and
exceedances for Zinc at Outfalls 2, 3 and 4. We were granted relief from the
Tiered responses for our Copper and Zinc exceedances in January of 2015.
We conducted several walk-through's as well as held several brainstorming
events where we explored possible acidic exposure. We sampled virgin
rainwater as well with this test and found the pH of the virgin rainwater to be 4.8.
This would explain the low pH at our outfalls. We will test again in January to
verify this claim. If we are able to validate this information we will then pursue
relief from monthly sampling.
If you have questions or concerns, please feel free to contact me.
D

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