NCG080822_EXCEED BENCHMARK_20210607

Charlotte -Mecklenburg
STORM
WATER
June 2, 2021
NC Department of Environmental Quality
Division of Energy, Mining, and Land Resources
Attention: Mr. Zahid Khan & Mr. James Moore
610 E. Center Avenue, Suite 301
Mooresville, NC 28115
Re: Tier III status at City of Charlotte Central Yard
NPDES Industrial Stormwater General Permit NCG080000
Dear Mr. Khan:
600 I . I our h Street
Charlotte, NC:. 28202
1`ax 70d.373.0473'
This letter is to inform you that the City of Charlotte's Central Yard has exceeded its permit
benchmark for total suspended solids (TSS) at Outfall 005 four times during the current permit
tern.
The NPDES Industrial Stormwater General Pen -nit NCG080000 standard for TSS is 100 mg/L.
The following summarizes the exceedances that have occurred:
Central Yard - Outfall 005
Permit Term - TSS Exceedances to date
Date
TSS (m /L)
9/29/2020
162
2/11/2021
130
3/25/2021
238
5/3/2021
510
e,.
Outfall 005 is new and serves as a bypass from a new underground detention structure installed to
help reduce polluted discharges from the site. It had not been cleaned out since construction, but
a full cleanout and inspection was completed on May 21, 2021. Please note that regular
inspection and maintenance will be done going forward. Additional response measures include
enhanced in person site -specific training for staff.
Please feel free to contact me at [phone] if you would like to discuss this issue further.
Sincerely,
Andrew DeCristofaro
Water Quality Program Specialist
City of Charlotte Storm Water Services
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