NC0024538_Staff Comments_19921001 (2)

DIVISION OF ENVIRONMENTAL MANAGEMENT
October 1, 1992
MEMORANDUM
TO: Monica Swihart
THRU: J. Trevor Clements )vtS W
Carla Sanderson
FROM: Jacquelyn M. Nowell,
SUBJECT: Comments on the Environmental Assessment for City of Shelby
Wastewater Treatment Plant Upgrade
(Amendment to the Shelby Portion of the Wastewater Facilities Plan for
Greater Cleveland County, North Carolina)
Project•No. 494
The Technical Support Branch has reviewed the subject document for the
upgrade of the Shelby Wastewater Treatment Plant (WWTP) and submits the fol-
lowing comment.
On page 8 of the environmental assessment, Paragraph 3 discusses Shelby's
water supply extraction upstream of the WWTP. This paragraph should be updated
to include information on the expansion of the water treatment plant from 2.0 MGD
to 18 MGD. . Technical Support has supporting information that this expansion
will lower the 7Q10 for the First Broad River at the discharge point of the
WWTP. A decrease of the 7Q10 flow could have implications on the future efflu-
ent limits for the Shelby WWTP and more than likely more stringent limits would
be applied to protect water quality.
it should be noted that Appendix E contains a letter from the Technical
Support Branch which states tentative effluent limits for the Shelby WWTP.
These limits were developed without-knowledge of the WTP expansion and
subsequent effect on the 7Q10. A further review incorporating the lower pre-
dicted 7Q10 will probably predict tighter limits potentially for BOD5, NH3, met-
als, and toxicants.
If there are any additional questions, please contact me.
cc: Rex Gleason
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