NC0034452_WASTELOAD ALLOCATION_19880927

' NPDES DOCYNENT SCANNING COVER $MEET
1
' NPDES Permit: NC0034452
Willow Creek WWTP
Document Type: Permit Issuance
QW!asteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Report
1 Instream Assessment (67B)
iEnvironmental Assessment (EA)
■ Permit
■ History
Document Date: September 27, 1988
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This document is printed on reuiae paper-igaaore any
content on the reverse side

1�r
DIVISION OF ENVIRONMENTAL MANAGEMENT
September 27 , 1988
MEMORANDUM
To : Arthur Mouberry
From: CCarla Sanderson
Through : David Vogt .L
Trevor ( lIements�\�
Subject : Willow Creek Builders , Inc .
NPDES Permit No . NC0034452
Davidson County
Technical Services has received and reviewed the letter from
the. Mayor. of Thomasville , James G . Norton, dated August 24 , 1988 .
The concerns addressed in the letter were reviewed with the
following conclusions :
1 . The Willow Creek discharge is above the City ' s drinking
water reservoir , Lake Thom-A-Lex.
a . The outfall from Willow Creek :is 6 miles above the
reservoir
b . The modeling analysis predicts the creek to be at back-
ground conditions 3 miles below the. discharge
2 . The proposed :increase in design flow should result in
more stringent limits .
a . The analysis performed in 1986 included Westchester
Academy , which no longer exists on the creek
b. The previous allocation was based on the dissolved.
oxygen minimum on an unnamed tributary above the
location of the Willow Creek discharge
3 . The limits for this facility should be at least as strin-
gent as those established for the Thomasville discharge into
Hamby Creek.
a . The 7Q10 flow in Hamby Creek :is 0 . 2 efs , and the 7Q10
flow :in Abbotts Creek is 1 . 55 cfs
b. The instream waste concentration for the City ' s dis-
charge into Hamby Creek is 97% and the instream waste
concentration for the Willow Creek' s discharge into
Abbotts Creek is 7%
The modeling analysis included all the surrounding residen
tial discharges at their existing limits . The instream self--
monitoring data show that downstream of the discharge the average
dissolved oxygen levels for summer are approximately 10 mg/l
and the D.O. saturation is 96 . 5%. The instream monitoring point
is located 0 . 5 mile below the discharge which is the approximate
location of the D.O . sag point from the modeling analysis .

Please contact David Vogt or myself-• :if you have any questions
or comments regarding this matter .
cc : Steve Mauney
Mike Mackey

ORSNCARO(/y1 (4tt}? .o
171omasvil1c. NoTLh Garolina 27360 P:1Jf
7 9
Au ust 24, 1988
`1 NpE Office of the Mayor
James G. Norton
rq
Mr. Paul Wilms, Director , 'E1
N . C. Dept. of Natural Resources and
Community Development SEP
P.O. Box 27687 17�Jci
Raleigh, N . C. 27611 -7687 ;s;7
Re: Proposed Re-Issuance and Modifications to NPDES Permit
#NC0034452 �(
Dear Mr. Wilms: -
The City of Thomasville is concerned about the proposed re-issuance
of the above referenced NPDES Permit. The discharge from this facility
is upstream of our reservoir, Lake Thom-A-Lex. It is the sole source
of water for the residents of the Cities of Thomasville and Lexington,
and the Fairgrove and Pilot communities.
The City is not opposed to any actions on the part of the State that
would improve the quality of water discharged to our impoundment. We
are opposed to the increased discharge limits proposed in this permit
established by your modeling procedures. The City feels the limits for
this facility should be at least as stringent as those established re-
gulating our discharge into Hamby Creek.
The City of Thomasville joins with the City of Lexington in calling for a
review of the discharge limits and a public hearing in Davidson County
to discuss the concerns of the cities as well as the neighbors of the
treatment plant.
Thank you for your consideration of these requests.
Very truly yours,
r—
/ 'James G. Norton
Mayor
JGN/h
CC: Roger Bryant
Kyle Williams
Duke Whisenant
Mike Mickey
Steve Mauney