NC0030210_Meeting Notes_19980227

NPDES DOCUMENT SCANNING: COVER SHEET
NPDES Permit:
NC0030210
Charlotte / Mallard Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Meeting Notes
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
February 27, 1998
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State of North Carolina
' Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
September 15, 1997
Mr. Douglas O. Bean, Director
Charlotte -Mecklenburg Utility Department
5100 Brookshire Boulevard
Charlotte, North Carolina 28216
Subject: Re -rating Comments
Permit No. NCO030210
Mallard Creek WWTP
Mecklenburg County
Dear Mr. Bean:
A preliminary review of your request to re -rate the Mallard Creek WWTP from 6.0 MGD to 8.0 MGD
has been completed. The Division can not approve the re -rating, without further plant improvements, based
on the following concerns:
Influent wastewater characteristics used in the calculations were lower than in previous years. The
maximum numbers should be used.
No pilot tests have been performed for possible chemical additions. Sludge storage capabilities must
be greater than 30 days per NCAC 2H .0138 (b)(8)(B). Sufficient sludge storage cannot be
determined without pilot tests being performed.
The report assumes that the same removal efficiencies attained at the plant at 75% capacity will be
reached at 133% capacity. Stress tests on the treatment system at the increased flow must be
performed in order to determine if the same efficiencies can be met.
There will be no backup chlorination system at the increased flow, which is required per 2H .0124 (3).
The plant has not met the ammonia limit of 2.0 mg/1 (summer) and 4.0 mg/I (winter). There have been
3 violations in the last year. If the facility can not meet its current limits, how can the facility meet the
reduced limits of 1.0 mg/I (summer) and 2.0 mg/I (winter) at the expanded flow?
The facility may submit plans and specifications for the construction of additional treatment units to
increase the capacity of the plant to 8.0 MGD. If the Division does not receive a request within 30 days, the
re -rating submittal will be returned.
The Division will move forward with the permit modification from 6.0 MGD to 8.0 MGD, unless
otherwise advised. This application has been assigned to Mary Cabe for review. If you have any questions,
comments or concerns, she may be contacted at [phone], extension 518.
Sincerely,
David A. Goodrich
NPDES Unit Supervisor
cc: Mooresville Regional Office / Water Quality Section
NPDES Unit
Mr. Don Safrit, P.E. / Point Source Branch
Mr. J. Reed Atkinson / CMUD
Mr. David M. Parker, P.E. / Black & Veatch
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
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