NC0004308_WLA_20211020

Strickland, Bev
From: Hill, David A
Sent: Wednesday, October 20, 2021 1:46 PM
To: Basinger, Corey; Scheller, Roberto
Subject: Fw: Badin Business Park discharge to Little Mountain Creek (USGS request #2021-133)
I'm forwarding this FYI since BBP is still questioning flows in Little Mountain Creek.
David Hill
Environmental Specialist II
Industrial Permitting Unit
**Email preferred during this time*
NC DEQ / Division of Water Resources / Water Quality Permitting Section
NPDES Industrial Permitting Unit
919 707 3612 office
919 707 9000 main office
david.hill©ncdenr.gov
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Hill, David A
Sent: Wednesday, October 20, 2021 1:27 PM
To: Mibroda, Jason <[e-mail]>
Cc: Dowden, Doug <[e-mail]>; Denard, Derek <[e-mail]>; Hennessy, John
<[e-mail]>; Weaver, John C <[e-mail]>
Subject: Badin Business Park discharge to Little Mountain Creek (USGS request #2021-133)
Hello Jason,
I'm following up on our call earlier. After reviewing prior wasteload allocations (WLAs) for the Badin WWTP
(NC0074756: 1987 & 1989) and Alcoa (NC0004308: 1988) and reviewing the supplementary information
provided by Curtis Weaver from the USGS (email 8/20/2021), it's unclear if the singular measurement taken at
gage 02123629 on 10/9/70 was balanced with respect to upstream point source discharges from the upstream
Alcoa facility (outfalls 003, 004, & 005) and the now closed Badin West WWTP (NC0046671 rescinded 1992
when the current Badin came online), these plants show up in the 1988 Alcoa WLA as 0.181 MGD and 0.13
MGD respectively. It is also unclear from the notes how that singular measure was used to determine critical
low -flows for Little Mountain Creek and whether that analysis was performed by USGS or Department staff. It
is also unclear whether the information provided from the other gages in the USGS email were evaluated for
upstream point source flow as well, nor is there information on how those small sets of measures were used
to develop low -flows for LMC. As such, we cannot use this data for developing critical flows for new,
expanding, or modified permits to LMC.
Sincerely,
David Hill
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Environmental Specialist II
Industrial Permitting Unit
**Email preferred during this time*
NC DEQ / Division of Water Resources / Water Quality Permitting Section
NPDES Industrial Permitting Unit
919 707 3612 office
919 707 9000 main office
david.hill©ncdenr.gov
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
2