NC0063096_Wasteload Allocation_19890321

NPDES DOCUHENT SCANNING COVER SHEET
NC0063096
Holly Springs WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Meeting Notes
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
March 21, 1989
This document is printed on paper - ignore any
content an the reYerse side

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCOO (0369(o
FACILITY NAME- Jam"'^ f / 0-')
Facility Status: EEX1TTM0) PROPOSED
(circle one)
Permit Status: RENEWAL .ATNN� UNPER rFIE NEW
(circle ons)
Major Minor,
Pipe No: 00/
Design Capacity (MGD): 0«:,Z��IGa ex, g¢�n9 j « pd P`
Domestic (% of Flow): /
Industrial (% of Flow):
Comments:
J L �r 0�,(,C(r/Q' ,Stat; ./Ley
d r`' 11�G8�'i �iG��'d• id 1k- 0, ,5ov /164,4
RECEIVING STREAM:
Class: &
Sub -Basin•
03- -07
Reference USGS Quad: E 23 Nk
County:
GUQI€
Regional Office: As Fa Mo
(circle *me)
Requested By:
Prepared By:
Reviewed By:
d Date:
SwL- Date:
(please attach)
Wi WS
4/P
Date:
Modeler
Date Rec.
1
-s� 1/
a tca as
FIZZ
•
Drainage Area (mil) 0,73° Avg. Streamflow (cfs). °•°
7Q10 (cfs) 0•0 Winter 7.Q10 (cfs) 0.0 30Q2 (cfs) 0• 0
Toxicity Limits: IWC % (circle one) Acute / Chronic
Instream Monitoring:
Parameters Temeccatur e 7o , �e c a l coL f M ion c�uc�.U,�y
Upstream Location Po 4L• a s-irec"''t
Downstream i__ Location svo 'Celt' rio441131-rcant of d�3.hu3t
ftOUED
Effluent
Characteristics
Summer
Winter
BOD5 (mg/I)
I C
2 z
NH3 N (mg/I)
q
t 1
D.O. (mg/I)
6
6
TSS (mg/I)
30
30
F. Col. (/100m1)
too°
/000
pH
6_ q
6-ei
1(SU)
ThtSe are. ex:
_I [�
si.•lly t.MirS (Of A
I-
eitS;q✓l Po. o .7.5
IZ.ecznAmcnc•
J
UENMAL oC Exi>an
J M6.1)
s:011 ,1t.. f.
7Qto= o cirt 1
.
BarnM.► n&L1 fcce.a.
L+ o4AAA. a
(3oQ2=o
t(OW s4-ici.y IA
coAi%A.A64'toll W:4k
Comments- USGS
. U-Key ! t[t
�U
show +lure '5 rsi`Fivt

a
MAR 0719)
Request No.; 5122
WASTELOAD ALLOCATION APPROVAL FORM
Facility Name:
NPDES No.:
Type of Waste:
Status:
Receiving Stream:
Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Quad:
Fecal
TOWN OF HOLLY
NC0063096
DOMESTIC
MODIFICATION
UTLEY
030607
WAKE
RALEIGH
LULA HARRIS
2/16/89
E23NE
SPRINGS
Drainage
Summer
Winter
Average
RECOMMENDED EFFLUENT LIMITS
Wasteflow (mgd):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
coliform (#/100m1):
pH (su):
Toxicity Testing Req.:
Summer Winter
0.25 0.25
16 22
9 17
6 6
30 30
1000 1000
6-9 6-9
o
MONITORING
area:
7Q10:
7Q10:
flow:
30Q2:
iV / R 13 i 89
0.730 sq mi
0.00 cfs
0.00 cfs
0.00 cfs
0.00 cfs
Existing Limits
/Y/9C.) /` CMG .mot t n .I}
; /4 3-ye.2 /, •4 • /Z %
Upstream (Y/N): Y Location: 100 feet upstream of discharge
Downstream (Y/N): Y Location: 500 feet downstream from discharge
COMMENTS
RECOMMEND DENIAL OF EXPANSION TO 0.500 MGD.
PER STANDARD DIVISIONAL PROCEDURE FOR DISCHARGES TO STREAMS WITH 7Q10=0
AND 3002=0, RECOMMEND REMOVAL OF DISCHARGE AS SOON AS AN ALTERNATE METHOD
OF WASTE DISPOSAL CAN BE FOUND. THE INSTREAM SELF -MONITORING REQUIREMENT
MAY BE DROPPED AS SOON AS THE FACILITY AGREES, IN WRITING, TO A SCHEDULE
FOR REMOVAL OF DISCHARGE. RECOMMEND INSTREAM MONITORING OF TEMPERATURE,
DO, FECAL COLIFORM, AND CONDUCTIVITY.
Recommended by: _tt .A .Sr
Reviewed by
ech Support Supervisor:
;JRegional Supervisor:
Permits & Engineering: _
RETURN TO TECHNICAL SERVICES BY:
Date:
Date: �!U
Date:
Date: _ 3
APR 04 1989
ita -use 5 • Ae...441 0(4_

DIVISION OF ENVIRONMENTAL MANAGEMENT
MEMORANDUM
r0:
FROM: Mike Scovillel MDS
THRU: David Vogt
Trevor Clements ��
Dale Overcash
March 15, 1989
SUBJECT: Permit Modification Request From the Town of Holly Springs
(NPDES No. NC0063096, Wake County)
The Town of Holly Springs has recently requested an NPDES permit modifi-
cation to increase the design flow of their WWTP from 0.25 MGD to 0.50 MGD.
Per standard Division procedure, Technical Services would recommend denial
of the expansion because USGS has estimated that there is no flow in Utley
Creek under both 7010 and 3002 conditions at the point of discharge.
Although the stream has been reported to have year-round flow from natural
springs, USGS does not take into account the presence of springs in their
flow estimation procedure and thus cannot verify a positive baseflow.
The Division does have a procedure, however, whereby a facility can con-
duct a flow study overseen by USGS for projecting low -flow statistics at an
ungaged site (copy attached). Consequently, Technical Services recommends
that the Town of Holly Springs withdraw their application for permit modifi-
cation until such a study can be completed on Utley Creek. The study could
be carried out this summer and the Town could then re -apply for an expansion
upon confirmation by USGS of positive baseflow estimates.
cc: Bill Kreutzberger
WLA file
Central Files

Procedures for. Projecting Low Flow Statistics
At '::n Un^aged Site
This summary is provided to assist in the development of data to
cietermine an acceptable projection of the low flow statistics (7Q10, 30Q2;
at stream sites where current information available to DEM yields zero 7Q10
and 30Q2 values. Low flow estimates used by the Division are based on data
collected at many stream sites under cooperative agreements with the U.S.
Geological Survey. Even though a significant data base has been accumu-
lated, it is impossible to collect data at all points on all streams in the
State. Therefore, estimates of the 7010 and the 30Q2 for streams where no
actual data has been collected are based on data collected at nearby streams
and a knowledge of the general hydrology of the area.
The Division will not approve new oxygen demanding discharges into
streams, where the estimated 7Q10 and 30Q2 are zero, unless it can be
demonstrated by the applicant for a discharge permit that there is flow at
the site under 7Q10 and/or 30Q2 conditions or that there is an appropriate
mechanism fpr establishing proper effluent limitations to protect water
quality standards and a reliable technology available to achieve those lim-
itations. To demonstrate that there is flow at the 7Q10 or 30Q2 level
requires collection of supporting data using standard engineering practices
and hydrologic techniques. The most widely used procedure requiring the
least effort and expense is to obtain direct flow measurements at the pro-
posed site, correlate those measurements with concurrent flow at nearby
gage( s) and, using a correlation curve with the 7Q10 and 3002 of the gaged
stream, project the 7Q10 and 30Q2 at the proposed site.

The accuracy of the low flow estimates :.hus determined depends largely
on how well the streamf lows compare - are t.h streams hydrologically similar
- and if they are similar, how well the relation between ,.he two is defined.
There are several factors to consider when attempting to define the corre-
lation curve:.
1. Measurements must be made during periods of base flow, that is when
streamflow is derived from groundwater; no surface runoff. Streams are
normally at base flow 5-7 days after the last rainfall event.
2. To define the curve, measurements must be made to cover a range in
flow; a minimum of 4 or 5 measurements reflecting separate hydrologic
events are normally required. It is unlikely that extreme events (e.g.
7Q10) will occur during the period you are collecting data and the
correlation will have to be extrapolated to the appropriate level. Of
course, the lower the flow is measured, the better the extrapolation
will be. Normally, the lowest streamflows occur in September and
October. Long extrapolations generally will not be accepted. (See
attached sample).
3. Diversions into or out of the stream may make correlation of flow
impossible. Streams affected by diversions will be handled on a case
by case basis.
4. Streamf low measurements must be made using generally accepted standard
engineering practices, such as, current meter measurements, calibrated
weirs, and volumetrically. Non -recognized techniques will not normally
be accepted.
5. Data from continuous stream gages can be obtained from the U.S. Geo-
logical Survey. It is important to note the station number, date and
time in your request for data.
U.S. Geological Survey
P.O. Box 2857
Raleigh, North Carolina 27602
6. The criteria for establishing a positive flow at a site will generally
be considered a projected flow (i.e. 7Q10, 3002) greater than 0.05 cfs.
However, each instance will receive individual review and a separate
interpretation.
Approval Procedures: In order to begin a 7Q10 flow study, a request must be
submitted to:
Mr. Trevor Clements and Mr.. Curtis Gunter
N.C. DNRCD/DEM 1later. Resources Division
WO Section/Technical Services Branch USGS
PO Box 27687 Raleigh, North Carolina 27602
Raleigh, North Carolina 27611-27687
- 2 -

include with this request a detailed study plan describing the following:
1. T}1e flow measurement: procedures and equipment to be used,
2. A map showing the location of the site,
3. A schedule for developing the flow data and a final report, and
4. A discussion of the facts, if any, which indicate why a positive 7Q10
flow at this site is expected.
The study must not begin until written approval of the plan is received from
DEM.
References
USGS - Techniques of Water Resources Investigations.
Book 3, Chapte.r A6. General procedures for gaging streams.
R.W. Carter and J. Davidian. 1968.
Book 3, Chapter A8. Dis-charge measurements at gaging stations.
T.J. Buchananan and W.P. Somers. 1969.
Book 3, Chapter A14. Use of flumes in measuring discharge.
F.A. Kilpatrick and V.R. Schneider. 1983.
Book 4, Chapter B1. Low -flow investigations. H.C. Riggs. 1972.
U.S. Geological Survey. Water Resources data for North Carolina.
Water Year 19--.
Yonts, W.L. Low -flow measurements of North Carolina Streams. North Caro-
lina Department of Water and Air Resources.

Discharge in cfs
1.0
.01
Example Cr-.038
EXAMPLE: CORRELATION CURVE
/
7010 Middle Cr-0.88
‘cpo,
cc.
s
1 1 r
6-15-85
(probably not base flow)
1 1 I
0.1 1.0 10.0
02088000 MIDDLE CREEK NEAR CLAYTON DA-83.5 square miles Discharge in cfs
100

INSTREAM SELF -MONITORING DATA
MONTHLY AVERAGES
Discharger: ¶owo1 of 00RSpc,/ Permit No. : NCO()63056
Receiving Stream: utlGv L�c�k Sub -basin: 030607
Upstream Location: I,, ("4- Downstream Location IOc� Y .s g„, �,
Upstream Downstream
:ATE TEMP D .0 . BOD5 COND. TEMP D .0. BOD5 ' COND
EC-88 �1 s .A
Ii��,-88\ 5 it
14_2
DCT- tea. g. S t0. w
5,G tZ
._I_ ^02Z,L
SE P-88 2 q', V r6' '. 3
AUG-88 21 ,c. (t,o) Z7.4 A, I 7.1)
JUL - 8 8 Z O l �S, o _21____ 8. 2 '7. o
SUN-88 ► M ,x (T.$) 19 T, S
MAY-88 ►S, 6 S_ 16 q 3
APR-88 13 g to. FS r3, g i0.2.
MAR-88 __4.... If,6 Io.N ro3
FEB-88 6 a _IL. IO.S
JAN-88 y,a� ►l, 8' Li, C ___II____
DE / Z 1/, S 4 ( 0,3
NO"; -87 I3.a _ill _ t%3 S,7_
O• T -8 f lo, 8 SR ILI _....t,7
EP-87
AUG- 7
J U L-87 ,
JUN-87
MAY- 87
APR-87
MAR-87 .
FEB-87
JAN-87
DEC-86
NOV-86
OCT-86
SEP-86
AUG-86
JUI - 8 6
J UN-86
MAY-86
APR-86
MAR- 8 6
FEB-86
JAN- 8 6
DEC-85
NOV-85
OCT-85
SEP-85
AUG-85
JUL-85
JUN-85
MAY-85
APR-85
MAR-85
FEB-85
JAN-85
6illy F(6-ett coabrevN vo.Lt AM, VtCy 10&J