NCG030130_LETTER GRANTING TIER RELIEF_20200303

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
BRIAN WRENN
Acting Director
March 3, 2020
NORTH CAROLINA
Environmental Quality
Daimler Trucks North America — Gastonia Facility
Attention: Ryan Pennington
1400 Tulip Drive
Gastonia, North Carolina 28052
Subject: Relief from Monthly Monitoring
Stormwater Permit # NCG030130
Daimler Trucks North America
Gaston County
Dear Mr. Pennington:
We are in receipt of your January 29, 2020 letter requesting relief from monthly monitoring at the Daimler
Trucks North America — Gastonia Facility. Based on a site inspection conducted on February 18, 2020, the
facility is in compliance with the tiered response actions and other conditions of the NCG030000 Permit.
Therefore, the Division is granting regulatory relief from the Tier responses. Upon receipt of this letter, the
subject facility may resume the permit specified semi-annual analytical monitoring for the remainder of the
current permit term which expires on May 31, 2021. This decision applies only to the pH and Copper
benchmarks. A benchmark exceedance of any other parameter listed in your permit will trigger the tiered
response actions as described in the general permit.
You must notify this office, in writing, within five business days if you become aware of any other significant
source of copper or pH at your facility that has the potential to be exposed to stormwater. The relief granted in
this letter is contingent upon the current industrial practices at Daimler Trucks North America— Gastonia
Facility.
Please retain and append this letter to your Stormwater Pollution Prevention Plan (SPPP) or permit. If you have
any questions or comments concerning this letter, please contact me or James Moore at 704-663-1699.
Sincerely,
Zahid S. Khan, CPM, CPESC, CPSWQ
Regional Engineer
Land Quality Section
Enclosure: Inspection Report
cc: Stormwater Laserfiche File
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North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Mooresville Regional Office 1 610 East Center Avenue, Suite 301 1 Mooresville, North Carolina 28115
704.663.1699

Compliance Inspection Report
Permit: NCG030130 Effective: 11/01/18 Expiration: 05/31/21 Owner: Daimler Trucks Na
SOC: Effective: Expiration: Facility: Daimler Trucks NA
County: Gaston 1400 Tulip Dr
Region: Mooresville
Gastonia NC 28052
Contact Person: Ryan Pennington Title: Phone: [phone]
Directions to Facility:
System Classifications:
Primary ORC:
Secondary ORC(s):
On -Site Representative(s):
Related Permits:
Inspection Date: 02/18/2020
Primary Inspector: Matthew J Gigante
Secondary Inspector(s):
Certification:
Phone:
Entry Time: 01:20PM Exit Time: 02:20PM
Phone: [phone]
Reason for Inspection: Routine Inspection Type: Compliance Evaluation
Permit inspection Type: Metal Fabrication Stormwater Discharge COC
Facility Status: Compliant Not Compliant
Question Areas:
0 Other
(See attachment summary)
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permit: NCG030130 Owner - Facility: Daimler Trucks Na
Inspection Date: 02/18/2020 Inspection Type: Compliance Evaluation Reason for Visit: Routine
Inspection Summary:
The inspection was a result of a tier relief letter recieved January 29, 2020 for outfall 001. Based on the letter and this
inspection, the facility is in compliance with NCG030000 and has evaluated sources of copper and high pH. Based on test
results, it appears that most of the copper and pH impacts from the roof were from limestone roof ballast. The limestone has
been replaced and other measures have been implemented to reduce copper in outfall 001. Therefore tier relief for copper
and pH for outfall 001 is recommended.
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