NCG030687_TIER II_20220705

NC Department of
Environmental Quality
Received
Date: 6/28/2022 JUL 0 5 2022
Facility:Altec Industries, INC, 200 Altec Way, Mount Airy, NC, 27030
Winston-Salem
Notification Type: Stormwater Tier Two Response Regional Office
Inspector:Tyler Nelson - EH&S Specialist, Sr.
Reason for Notification:The stormwater sample analysis for the compliance sample taken on June 2, 2022, revealed
levels of copper at Outfall 001 that exceeded the State's benchmark value. Sample analysis showed copper at 0.0124(1)
mg/L, which exceeds the benchmark value of 0.010 mg/L. This is the second consecutive sampling result above the
benchmark value for copper at Outfall 001, which places our facility in Tier Two status.
Inspection Findings:The benchmark exceedance was observed in the sample taken from Outfall 001. Outfall 001 is the
facility's northernmost outfall that receives stormwater runoff from paved parking areas. During the stormwater
sampling conducted on June 2, 2022, there were no indications of potential or possible causes of the increased levels of
copper observed in the sample analysis. A follow-up stormwater management inspection that occurred after sample
analysis results were received on June 27, 2022, did not reveal any sources of copper that may have led to the
benchmark exceedance.
Response Actions:A stormwater management inspection was completed on 6/27/2022. The facility currently stores raw
materials such as carbon steel, stainless steel, and aluminum in the courtyard that discharges to Outfall 001. The facility
has made a concerted effort to minimize the amount of uncovered raw material stored outdoors in this location.
However, during the inspection, metal racking was found at a storm drain that discharges to outfall 001. This racking was
observed to be rusty and may have contributed to the copper identified in the sample.This racking will be discarded or
stored under cover.
The facility will continue to conduct monthly stormwater management inspections to monitor possible contamination
sources. Stormwater management inspections include chemical container integrity, secondary containment, waste and
raw materials storage, signs of erosion,trash and debris, spill prevention and response, non-stormwater discharge, and
storm drain sediment filters.
Per permit requirements,the facility plans to conduct monthly stormwater sampling from Outfall 001 during a
representative rain event starting in July 2022. Required qualitative monitoring will also be conducted during these
sampling events as well.
Other Comments:The facility will continue to investigate possible causes of the copper benchmark exceedance and
implement corrective action through best management practices within the one-month time frame required in the
stormwater permit.
Should you have any questions, please contact me directly.
Thank you,
Tyler Nelson
EH&S Specialist, Sr.
[e-mail]
cell: 336-504-9464
office: 336-786-3435