NC0004308_Report_20200227

,Are' R OS
February 17, 2020
North Carolina Department of Environmental Quality
Mooresville Regional Office
610 East Center Ave.
Mooresville, NC 28115
ATTN: Roberto Sheller
Re: Badin Business Park LLC NPDES Permit No. N00004308
To Whom It May Concern:
Badin Business Park LLC
Highway 740
P.O. Box 576
Badin, NC 28009
Tel: [phone]
This submittal is to satisfy the five (5) day written notification requirement of the Badin
Business Park LLC (BBP) NPDES Permit specifically Part II Section E.6. BBP determined an
exceedance of the monthly average permit limit for cyanide at Outfall 005 on February 14th.
On February 14, 2020, Randall Kiser of my staff verbally reported this January exceedance to
Roberto Sheller of the Mooresville Regional Office.
A total of 5 grab samples representative of the Outfall 005 discharge were collected during the
month of January. The resulting average of the 5 grab samples were 6.12ug/l.
Alcoa is continuing to pursue finding a laboratory, certified in North Carolina, who can perform
the ASTM D7511 Method for Cyanide. As we have previously discussed with the Department,
we believe the existing method that we are using has interferences particularly at low
concentrations closer to the method detection limit that are causing false positives for Cyanide
at our outfalls.
We will keep the Department apprised of any further findings and additional actions that we
take to address this matter. Please do not hesitate to contact me at [phone] or Randall
Kiser of my staff at [phone].
1 certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate
the information submitted. Based on my inquiry of the person or persons who manage the system, or those
persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. 1 am aware that there are significant penalties for submitting
false information, including the possibility of fines and imprisonment for knowing violations.
Sincerely,
Robyn L. Gross
cc:Randall Kiser