NC0028746_1996 permit renewal info_19961231

Staff Review and Evaluation
NPDES Wastewater Permit
FACILITY INFORMATION
Facility Briarwood Subdivision
NPDES No. NCO028746
Design Flow (MGD) 0.05
Facility Class II
STREAM CHARACTERISTICS
Stream Name
Stream Class
Sub -basin
Drainage Area (mit)
S7Q10 (cfs)
W7Q10 (cfs)
30Q2 (cfs)
IWC (%)
UT to Brushy Fork Creek
C
030201
0.42
0.08
49% (@0.05 MGD)
Proposed Changes
Parameters Affected
Basis for change(s)
Monitoring Frequencies
NH3,Feca1, H,BOD,TSS,TRC
NCAC 2B.0500 Regulations
Compliance Schedule: None
Special Condition(s): Quarterly Chronic Toxicity Test
Permits & Engineering Comments:
There have been no facility modifications since the last renewal. Facility has consistently
met permit limits. Recommend continuing WET test @ 49%. Monitoring frequencies have
changed based on .0500 regs. Recommend renewal of permit.
Prepared b V '
p Y
Regional Office Evaluation and Recommendations:

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ROAD CLASSIFICATION
PRIMARY HIGHWAY LIGHT-DUTY ROAD, HARD OR
HARD SURFACE IMPROVED SURFACE
SECONDARY HIGHWAY
HARD SURFACE UNIMPROVED ROAD
Latitude 36019'15"
Longitude 80119'17"
Map # B17SE
Sub -basin 03-02-01
Stream Class
C
Discharge Class
05
Receiving Stream -
Brushy Fork Creek
Design Q 0.05 MGD
Permit expires 1/31/02
SCALE 1:24 000
QUAD LOCATION Rayco Utilities, Inc.
NCO028746
' Stokes County
Briarwood Subdivision WWTP

From:
Date:
Subject:
To:
Cc:
5�veum Pa9.,
Note for Carla Sanderson
Carla Sanderson
�p
Thu, Jun 29, 1995 9:09 AM
C�G�Gv�
X11
RE: Briarwood Subdivision .
Coleen Sullins (-
Farrell Keough Auaw—(�( v
Thanks for the info. We do have the initial flow study results in our files, but the file ends
with a letter written back to L. Stogner concerning continuation of the study (dated in Sept
'94) since the results for 7Q10 in the initial flow study are inconclusive. I do not feel
comfortable with accepting the 0.08 cfs especially since the USGS did not concur with the
outcome of the study - and they further suggested continuation of the study until January '95
in order to get more data points and a valid 7Q10 flow for the UT Brushy Fork Creek. I
realize this may be a mute point at this time since they have already received a permit
reflecting an IWC into 0.08 cfs flow stream.
My concern at this point is using that flow for future allocations.
From: Coleen Sullins on Wed, Jun 28, 1995 6:22 PM
Subject: RE: Briarwood Subdivision
To: Carla Sanderson; Dave Goodrich
Because the low flow study was accepted even with the minimal information that was
collected. I don't know why the information on the results of the study is not in our files,
but Farrell may have it with the WLA files. Leonard did not want to have to accept his
results initially, but felt that if he continued to do the testing the results would increase the
flow. The study resulted in only two (three?) data points all grouped together from which to
extrapolate the flow estimate and Leonard was not happy with the 0.08 cfs figure. I think he
was aiming for an ammonia limit of greater than 2 and he wasn't going to get one and any
additional data was not going to give him much additional wiggle room. However, since he
had no option to adjudicate the permit (he had filed a withdrawal) and he could not meet the
ammonia limit, he agreed to accept the tox test. The region was also pushing for the
dechlorination unit to be installed. I even think the region was the one who did not want us
to allow him another year to collect more data and the permit had a kick in date that was past
for complying with the ammonia limits. Since this is a 100% domestic, I believe the
consensus was that the option of a tox test was appropriate. Why the low flow data was
accepted with this minimal information, I don't recall. Sorry
From: Dave Goodrich on Wed, Jun 28, 1995 1:09 PM
Subject: FW: Briarwood Subdivision
To: Coleen Sullins
Coleen - Do you know/remember what's going on with this one? Farrell and Carla have
been inquiring also.
From: Nancy Owens on Mon, Jun 26, 1995 2:20 PM
Subject: Briarwood Subdivision
To: Dave Goodrich
Mike Mickey of WSRO called about NC0028746 (Briarwood Subdivision. This was Sean
Goris' project. Did not know who else to ask for. IMS down at this time. He posed the
-�ol(bwI � t ueshgr,: W T 0461- 1 z+q°jD 4\.6+C&d 4 1b °/a

Page 1
Note for Carla Sanderson
From: Carla Sanderson
Date: Tue, Jun 27, 1995 9:28 AM
Subject: Rayco Utilities
To: Coleen Sullins
NPDES Permit No. NCO028746
Coleen - this permit had a modification letter sent in January '95 for the Chronic Tox Test
change from 90% to 49% (original signed by you and contact was Sean Goris). The facility
performed low flow studies on Brushy Fork back in the summer of '94 in order to disprove
the 0 7Q10. Last bit of info concerning stream flow measurements we have for our files is
the suggestion in concurrence with USGS to continue the stream study until January'95. We
have no further info on the stream flow. Do you know the details or verification of the new
7Q10 that allowed us to change the IWC?
I need to return a call to the region since they are inquiring about this.
Thanks!

Page 1
Note for Sean Gods
From:
Farrell Keough
Date:
Mon, Dec 12,1994 10:14 AM
Subject:
RE: Rayco Utilities
To:
Sean Goris
File(s):
QCL P/F
enclosed is the toxicity test..., fill in the top and bottom and the highlighted % and months
the test should be taken in.
for 0.08 cfs, the IWC is 49%
for 0.16 cfs, the IWC is 32.5 %
From: Sean Goris on Dec 9, 1994 9:33 AM
Subject: Rayco Utilities
To: Coleen Sullins; Farrell Keough
I spoke to Leonard Stogner today. I asked him if he felt the new numbers from stream
testing were going to change the 7Q10 estimate of the stream significantly. He said no and
felt that there was no way the stream flow would double. I calculated the IWC using a 7Q10
of .08 cfs. to be 49%. I told him he would receive a QCL at 49%, subject to RAG
confirmation, if he chose to take that option. He felt that if dechlorination were installed at
the facility, he may be able to meet that limit. He is going to speak with Thurman Horne
concerning the stream flow estimate and talk to me on Monday. Farrell if you can confirm
what the tox. test would be given a 0.08 cfs, I belive we can work out a solution where
Stogner will accept the tox test. I belive we should write the permit such that Stogner will
have a grace period to install the dechlor. and get the thing issued.
,zl,Zls4
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<'�� 4e,4�

ENVIRONMENTAL WASTEWATER SERVICES, INC.
4200 Highway 29
Harrisburg, NC 28075
NC License RC1378
Ms. Coleen Sullins, Supervisor
Permits & Engineering Group
NC Department of ENHR-DEM
P.O. Box 29535
Raleigh, 27626-0535
RE: Stream Flow Study
Briarwood WWTP
NPDES NCO028747
Stokes County
Dear Ms. Sullins:
[phone]
October- 21, 1994
SC License 5341
Imt,
g: -
1)
I am in receipt of a letter dated September- 12, 1994 from Mr. Donald L. Safi -it, P.E.
stating that the stream flow study conducted on the above referenced facility was
inconclusive and the original 7Q 10 flow estimate of @ cfs will remain in effect.
The purpose of this study was to establish an actual stream flow from which NPDES limits
could be established. Since this could could be accomplished with more stream flow
information, we respectfully request that stream flow monitoring can be resumed the week
of November 1st and continue until sufficient information has been collected.
I trust that this meets with your approval. If you have any additional comments or require
additional information, please contace me at [phone],
LES/bh
Sincerely,
Leonard E. Stogner, Jr.
President

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Leonard E. Stogner, Jr.
Vice President
Rayco Utilities, Incorporated
4200 Highway 29
Harrisburg, North Carolina 28075
LT�!W'j
-A I
EDEHNR
September 12, 1994
Subject: Stream Flow Measurement Results
Briarwood Subdivision
NPDES Permit No. NCO028746
Stokes County
Dear Mr. Stogner:
The Technical Support Branch of the Water Quality Section has reviewed the report dated August 18,
1994 concerning new flow measurements for the unnamed tributary to Brushy Fork Creek. After review
and consultation with the USGS it has been determined that the results of this study are inconclusive.
The data were taken during a two week period and therefore the points were clustered and cannot be
used to correlate a flow at your location. At this time the original estimate of 0 cfs s7Q10 will remain in
effect.
If your future plans still include reassessing the summer 7Q10 for this location, we would encourage you
to continue obtaining data for this study. Data should be collected up until the next high flow period which
starts in January.
Please feel free to call Mr. Farrell Keough of this office at [phone] if you have any questions or
comments regarding this issue.
Sincerely,
Donald L. Safrit, P. E.
Assistant Chief for Technical Suppo
cc: Winston-Salem Regional Office
Mr. Robert Mason
U.S. Geological Survey
P.O. Box 30728
Raleigh, NC 27622
Susan Wilson, P & E
Central Files
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

NC License RC1378
RAYCO UTILITIES, INC.
4200 Highway 29
Harrisburg, NC 28075
[phone]
Augurt 18, 1994
MA. Donatd L. Sa�Ait, P.E.
N.C. Dept. o� EnviAonment, Heatth 8
Natunat Rezoukcez
Divizion o4 EnviAonmentat Management
Wates 2uat.ity Section
Subject: Stkeam stow Meazutement Rezuttz
BAiaAwood Subdivizion
NPVLS Pekmit No. NC0028746
Stok ens County
DeaA Mx. Sa�Ait:
Pu,ltzuant to PaAt III, Condition F o� the subject peAmit, I am zubm-itting
herewith the ftezutts o� the zVteam Atow meazwtement 4on BAianwood Subdiv-
-izion. These nezuttz conctude that a pozitive 7210 Atow ex.iztz in the
amount o4 0.081 cAz. In accordance with the teams o6 the penm-i-t, I
undeAztand that the pexmit witt be reopened to neevatuate toxicity and
ammonia nequ-iAementz.
A copy o4 thiz tetter, the nezuttz and a video tape o4 the mea�sunement
pnocedunez hays been 4onwanded to Mn. Rbbeftt Mason, USGS.
I twit that this ink otmation iz w44 icient, but i4 you have any queztionz,
etc., pteaze contact Mn. Thunmon Hohne at 704-282-1533 on myzet� at 704-
788-9497.
S.incenety,
Leonard StogneA
c_: Mit. Robeltt Mason
Mn. ThuAmon HoAne,P.E.

�(�`\ �� � NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
HEALTH AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT,
September 9, 1993
ME M 0 R A N D U M
— — — — — — — — — —
TO: Carla Sanderson, W.Q. Technical Support
THRU: Steve Mauney, WQ Supervisor® WSRO'—;Z�
FROM: Abner Braddy, WQ, WSRO
SUBJECT: Proposed Plan of Stream Flow Measurement
Briarwood Subdivision
NPDES Permit No. NC0028746
Stokes County
We have reviewed the subject package, submitted on behalf of
the permittee by Thurman Horne,, P.E. While we will leave the
assessment of the propriety of the methodology to you, we offer the
following on the location of the measurement:
(A) The proposed location is just upstream of the discharge.
(B) The Region knows of no upstream discharges or water
intakes which could 'affect the stream flow.
Should you have questions, please call.
SM/AB/ahl
CC: Sean Goris, Permits and Engineering
Central Files
WSRO

S tate of North Carolina
Department of Environment,
Health and Natural Resources ` •
Division of Environmental Management
IL
James B, Hunt, Jr., Governor
Jonathan B, Howes, Secretary H NF=1
A. Preston Howard, Jr., P.E., Director
September 2, 1993
J. Thurman Home, P.E.
Post Office Box 1386
Monroe, North Carolina 28111
Subject: Proposed Plan of Stream Flow Measurement
Briarwood Subdivision NCO028746
Stokes County
Dear Mr. Horne:
The stream flow measurement plan submitted has been reviewed by the Technical
Support Branch and a simple change in the methodology proposed would be requested. The
plan calls for the use of a five gallon bucket as a measuring device. Tom Zembrzuski, [USGS]
pointed out that, if during the measurement periods) the stream flow is similar to that portrayed in
the pictures attached to this report, these buckets will fill up too fast for an accurate measurement.
The general time frame required for an accurate measurement needs to be from ten to fifteen,
(10-15) seconds. In other words, a container more in the vicinity of twenty-five (25) gallons would
be appropriate. The only other item(s) requiring comment were two technical problems that can
be easily remedied by an amendment letter form you; (1) submission of the final results,
calculations, extrapolations, etc. need to be sent to:
Donald L. Safrit, P.E.
Assistant Chief for Technical Support
Division of Environmental Management
Water Quality Section
PO Box 29535
Raleigh, NC 27626-0535
and (2), the calculations, [page 3] for Average Measurement (gal/sec) = 5 gallons i T(UQJ should not be
5
divided by five. The calculation for Average measurement (gal/sec) should read as follows:
(# buckets * 5) / total seconds.
After discussing this plan with Tom Zembrzuski and Robert Mason, [USGS] the Technical
Support Branch will concur with their assessments of this plan. It was at Robert Mason's
suggestion that you take pictures of the site for verification. Mason also suggested that a video
recording of the measurement process be taken for further documentation. The Technical
P.O, Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Support Branch feels this is a valid solution to any documentation problems which may arise
during this process.
The use of a pipe as a release to this dam was discussed with Mr. Mason. He felt that it
would be appropriate to insert a pipe at the bottom of the stream dam to create a 'drop' of the
release for placement of the container to take measurements. Mr. Mason's understanding of this
set up was that leakage could occur around the insertion point of this pipe; if anything, this would
lead to more conservative measurement.
Because of current weather conditions, (i.e. lack of rain for an extended period of time) it
is imperative to begin this study immediately. The report implies these measurements will be
taken sometime in September or October, but immediate implementation would derive more
representative results. The Division of Environmental Management will need documentation as to
what changes will be made in the submitted plan, (i.e. the size of measuring container you will use,
will this process be taped on video, and what Average Measurement (gal/sec) formula will you
use).
If you require any more information on this matter, please contact Mr. Farrell Keough at
[phone].
cc: Coleen Sullins
Winston-Salem Regional Office

August 23, 1993
N.C. Department of Environment, Health & Natural Resources
Division of Environmental Management
Technical Support Branch
P.O. Box 27687
Raleigh, NC 27611-7687
Subject: Proposed Plan of Stream Flow Measurem �-,. -. -�
Briarwood Subdivision _
ANTH
NPDES Permit No. NC0028746��'
Stokes County
Gentlemen:
Attached is a plan describing our proposed method for measuring and
determining flow in our receiving stream. This plan is submitted pursuant to
Part Ili. F of the subject permit.
I believe that the proposed location and methodology represent a reasonable
method of obtaining reliable information on stream flow conditions. I hope
that this proposal meets with your approval.
If you have any questions, comments or need any additional information,
please call me (704/282-1533) or Mr. Leonard Stogner (704/788-9497).
I understand that flow measurements should begin only after receipt of your
approval. I will look forward to your reply.
Sincer�y,
urman Horne, P.E.
JTH/ml
c: Winston-Salem Regional Office
Mr. Robert Mason, USGS
Attachment

Summary of Permit Status
Ravco Utilities Briarwood Subdivision NC0028746
The previous permit for this facility contained standard 30/45, BODS and TSS limits but
did not have a limit on ammonia. When the permit was renewed the permittee was given,
along with 30/45 BOD/TSS limits, the choice of ammonia limits or toxicity testing in
accordance with the current zero 7Q 10 policy. The permittee informed the Division that he
could not comply with either toxicity testing or ammonia limits and refused to decide
between the two. Given this non -decision, the region suggested that ammonia limits be
placed in the permit, which they were according to instrearn ammonia toxicity criteria.
Apparently the previous permit did not contain a zero flow clause because the stream,
which has a positive 30Q2 flow, is not technically a zero flow stream The permittee is
now adjudicating the ammonia limits he received in the renewed permit and is also
adjudicating the Divisions zero 7Q 10 estimate of the stream. In a response to the
adjudication, the division offered to drop the anrnionia limits and put toxicity testing in its
place, while giving the permittee the option of perfoi-n-iing a low glow study of the stream.
Upon submittal of the low flow study, the Division offered to reconsider the terms of the
renewed permit based on data gathered in the study, in response to this offer, the permittee
says he still cannot meet either the ammonia or toxicity requirements and would like the
Division to drop these requirements for a period of at least six months so a low flow study
can be completed.
The ammonia limits in the renewed permit were effective on the date that the permit was
issued.
b+

33TATE OF NORTH CAROLINA
�OUNTYOF Sfofi eS
Ra Ko aft 11 �'��, SNC, Petitioner
Briql"Wood
V.
DEPARTMENT OF ENVIRONMENT,
HEALTH, AND NATURAL RESOURCES
DIVISION OF
Respondent.
IN THE OFFICE OF
ADMINISTRATIVE HEARINGS
FILE NO. 73 �5HR 0/1f3
NOTICE OF WITHDRAWAL
OF PETITION
Petitioner hereby withdraws its petition for a contested case hearing.
No further proceedings are needed or required to resolve the contested case
captioned above.
This the day of
Petiti ner/Authori y or Petitioner
CERTIFICATE OF SERVICE
hereby certify that I have served a copy of the attached NOTICE OF
WITHDRAWAL on by having same placed in the United States Mail bearing
sufficient postage for delivery by first class mail and addressed as
follows:
Attorney General's Office
Environmental Protection Section
PO Box 629
Raleigh, NC 27602-0629
7
( ate) Petitioner/A o ey for —
Petitioner

August 23, 1993
N.C. Department of Environment, Health & Natural Resources
Division of Environmental Management
Technical Support Branch
P.O. Box 27687
Raleigh, NC 27611-768793
/ t
Subject: Proposed Plan of Stream Flow Measure tij!; �_ � r -ANCH
Briarwood Subdivision
NPDES Permit No. NC0028746
Stokes County
Gentlemen:
Attached is a plan describing our proposed method for measuring and
determining flow in our receiving stream. This plan is submitted pursuant to
Part III. F of the subject permit.
believe that the proposed location and methodology represent a reasonable
method of obtaining reliable information on stream flow conditions. I hope
that this proposal meets with your approval.
If you have any questions, comments or need any additional information,
please call me (704/282-1533) or Mr. Leonard Stogner (704/788-9497).
I understand that flow measurements should begin only after receipt of your
approval. I will look forward to your reply.
Sinc_er-ely,
urman Horne, P.E.
JTH/ml
c: Winston-Salem Regional Office
Mr. Robert Mason, USGS
Attachment

PROCEDURES FOR PROJECTING LOW FLOW STATISTICS
AT
INCORPORATED
BRIARWOOD SUBDIVISION
STOKES
CARO' '.
.•,......,•l �'�fy •,�
Stpy�% 9
s SE AL
10436 ,+
r
THURMO
l G%C%
RAYCO UTILITIES, INC.
4220 HWY. 29
HARRISBURG, NC 28075
J. THURMAN HORNE, P.E.
P.O. BOX 1386
MONROE, NC 28111

TABLE OF CONTENTS
1.0
Background Information 1
2.0
Field Investigations 1
3.0
Flow Measurement and Gauging Procedures 2
4.0
Correlation to Flow Conditions at USGS Guaging Station 4
5.0
Additional Discussion and Conclusions 4
6.0
Technical Contents 5
FIGURES
Figure 1 Site Location
Figure 2 USGS Gauging Station Location
APPENDICES
Appendix I Draft NPDES Permit Part III, Subpart F
Appendix II Procedure for Projecting a Seven -Day Ten -Year Low Value at
an Ungauged Site
Appendix III Sample of Extrapolation Curve
Appendix IV Pictures

Briarwood Subdivision is located on N.C. Highway 66 Southeast of
Mount Olive in Stokes County, North Carolina. Figure 1 illustrates the
facility location on the USGS topographical map for the area. The facility is
permitted through the North Carolina Department of Environment, Health
and Natural Resources (NCDEHNR) to discharge wastewater under National
Pollutant Discharge Elimination System (NPDES) Permit No. NC0028746.
The receiving water designated in the NPDES permit is an unnamed tributary
to Brushy Fork Creek in the Roanoke River basin.
Part III, subpart F of the draft above referenced NPDES Permit
requires that the permittee submit a plan to NCDEHNR that will provide
measurements detailing low flow statistics for the seven-day ten-year
stream discharge (7Q10) event. Appendix I presents a copy (part III,
subpart F) of the subject Permit. It is the intention of this plan to meet the
requirements of subpart F and to determine an acceptable projecton of the
low flow statistics at the receiving stream.
This plan was developed in accordance with the NCDEHNR and USGS
published document, "Procedures for Projecting a Seven -Day Ten -Year Low
Value at an Ungauged Site". The purpose of this plan is to outline the
procedures to be used for estimating low flow conditions in the receiving
stream. Appendix II presents a copy of the NCDEHNR document. It is the
intent of this study to provide site-specific flow estimates for the section of
unnamed tributary to Brushy Fork Creek that receives wastewater
discharges from the Briarwood Subdivision wastewater treatment plant.
2.0 FIELD INVESTIGATIONS
A field investigation was conducted on August 7, 1993 to assess the
characteristics of the receiving stream and the point of waste water
discharge. See Figure I for the location of the existing discharge and
proposed stream flow measurement location.
The stream is best described as being fairly narrow, ranging from ten
to thirty feet in width. The stream is approximately one to three feet deep
with a rocky bottom. Water appears to flow slowly through broad deeper
areas, but the stream is predominantly narrow and shallow with fairly rapid
flow velocity.
The flow upstream of the site is the result of the confluence of two
(2) smaller tributaries. Flow appears to be derived from ground water
seepage, storm water runoff, and perhaps underground springs.
Page 1

The following, factors were used in evaluating sampling and gauging
locations to be used for estimating low flow conditions in the receiving
water:
Accessibility to sampling points across entire span of creek;
Safety of personnel performing flow measurement activities;
Proximity to facility wastewater discharge point; and
Flow conditions at the sampling location are representative of
flow conditions at the discharge point.
The natural characteristics of the tributary lend themselves well to a
fairly simple, yet very accurate method of measuring flow. Immediately
upstream of the discharge, the stream bed is solid rock and forms a natural
"slide" that drops an elevation of approximately eight (8) to ten (10) feet.
(See pictures in Appendix IV).
It will be fairly simple to temporarily constrict the stream flow to
come out of a small diameter pipe from which the flow can be accurately
measured.
3.0 FLOW MEASUREMENT AND GAUGING PROCEDURES
The following describes procedures that will be used to collect flow
measurements at the site:
1. A rain guage will be installed at the wastewater treatment
plant. Rainfall will be measured to insure that no rainfall has
occurred prior to stream measurements that will occur 5 to 7
days later. Weekly measurements will be made beginning
seven (7) days after receiving NCDEHNR approval and will
continue for a minimum of twelve weeks or until at least five
acceptable measurements have been obtained during base flow
conditions. Measurements will only be taken when there has
been a preceding five (5) days with no measurable
precipitation.
2. Measurements will be collected during periods of base flow,
that is when stream flow is derived primarily from ground water
f intrusion and not surface runoff. Streams are normally at base
flow 5-7 days after the last rainfall event.
Page 2

3. The stream fow will be temporarily constricted above the
location of the wastewater treatment plant discharge such that
all of the stream flow will pass thru a small diameter (4" or 6")
PVC pipe. The stream flow will be diked on the crest of the
rock slide upstream of the discharge by using tightly packed
sandbags and clay (if necessary to seal small cracks). The
small diameter pipe shall be installed thru the temporary dike
and sealed so as to make all of the flow pass thru the pipe.
(NOTE: At low flow conditions such as those observed during
the investigation, the width of stream bed to be diked should
be less than ten (10) feet, and the required height less than one
foot.)
The pipe shall be extended downstream approximately five (5)
to ten (10) feet as necessary to allow sufficient vertical
clearance to easily capture free falling water in a five (5) gallon
bucket. (NOTE: The natural characteristics of the rock "slide"
are such that the elevation downstream drops quickly.
Therefore, it will be an easy matter to get enough drop to
enable catching the flow in a bucket and at the same time, will
require very little to block or impound the stream.)
4. Measurements of the stream flow will be taken at base flow
conditions by using a stop watch to record the amount of time
(in seconds) required to fill a five (5) gallon bucket. This
procedure will be repeated three (3) times each time base flow
conditions have occurred that allow measurement. The
average of the three (3) results shall be considered to
constitute a measurement.
The resulting measurement shall be converted mathematically
to terms of cubic feet per second by means of the following
formulae:
Average Measurement (gal/sec) = 5 oallons/Tfsec)
5
Average Measurement (cfs) = Ava. Measurement (gal /sec)
7.48 gal/cu. ft.
A minimum of five (5) measurements reflecting separate
hydrologic events will be collected. It is expected that these
measurements can be obtained over a twelve (12) week period.
However, an extension may be necessary to collect at least five
Page 3

measurements under base flow conditions. Normally, the
_v lowest stream flows occur in September and October. It is
unlikely that extreme events will occur during the period we are
collecting data and a correlation will be performed to
extrapolate flow conditions to the appropriate level.
4.0 CORRELATION TO FLOW CONDITIONS AT USGS GAUGING
STATION
USGS was consulted to determine an appropriate existing
gauging station that could be used for flow correlation. Whereas
there are no existing gauging stations on the receiving stream, a
suitable gauging station was selected considering the frequency of
USGS measurements, proximity to the study area and similarity of
hydrogeologic characteristics.
USGS recommends and the engineer agrees that it would be
best to correlate flow measurements to data derived from USGS index
station number 02114450. This station is located on Little Yadkin
River in Dalton and is the closest continuous gauging station for this
location. A request has been made with USGS to provide printouts of
their flow recordings at this station durinn, the period of flow
measurement.
The results of the flow measurements will be plotted versus the
measurements at the USGS station to develop a correlation curve as
depicted in DEM's "Procedures for Projecting a Seven -Day Ten -Year
Low Value at an Ungauged Site". From the correlation curve, the
estimated 70.10 for the receiving stream will be extrapolated.
Upon completing the flow measurements, a report will be
forwarded to DEM and USGS which summarizes the measurements
dates and times of measurements, rainfall measurements, calculated
flows, USGS flow correlation data, projected correlation curve and
projectd 7Q10 flow. The report will contain the above information
plus details and descriptions as appropriate to describe encountered
conditions, etc. to substantiate the validity of the measurements
made.
5.0 ADDITIONAL DISCUSSION AND CONCLUSIONS
The criteria for establishing a positive flow at a site will
generally be considered a projected flow (i.e., 7Q10, 30Q2) greater
Page 4

than 0.05 cu. ft./sec. From the correlation curve, the estimated
7Q10 for the receiving stream will be extrapolated. A positive 7Q10
flow is expected based on the amount of drainage area, observed
physical characteristics (including aquatic life) and the reported
history of stream flow by the operator. It is our understanding that
NCDEHNR will review the findings of the field sampling as presented
in a final report.
A final report will be prepared that will contain at a minimum
the following:
1. A summary of all discharge measurements and sampling
methodology;
2. Rainfall measurements;
3. Stream flow measurements and calculations;
4. USGS discharge correlation data; and
5. Extrapolations and flow projection curves.
This sampling plan will be submitted to the individuals identified
below for approval. Upon approval, sampling activities shall
commence, followed by necessary calculations and extrapolations,
and submission of a final report to the appropriate agencies listed
below:
Mr. Trevor Clements and
NC DNRCD/DEM
WO Section/Technical
Services Branch
PO Box 27687
Raleigh, NC 27611-27687
6.0 TECHNICAL CONTACTS
Mr. Robert Mason
Water Resources Div.
USGS
Raleigh, NC 27602
Questions regarding this protocol should be directed to one of
the following technical contacts:
Mr. J. Thurman Horne, P.E.
[phone]
Page 5
Mr. Leonard Stogner
EWS/Rayco
[phone]

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G Site Location From USGS Map

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FIGURE 2
USGS Gauging Station Location

e1�s
215
PEE DEE RIVER BASIN
.r
f'
02114450
LITTLE YADKIN RIVER AT DALTON, NC
LOCATION. --Let 36017'56•, long 80°25'530, Stokes County, Hydrologic
of bridge on D.S. Highway 52, 1.0 mi southwest of Dalton,
Unit 03040101 on left bank 1,200
1.3 mi downstream of Southern Railway
ft downstream
bridge, and
2.0 mi downstream of Danbury Creek.
DRAINAGE AREA. --42.8 mil.
PERIOD OF RECORD. --August
1960 to
current year.
REVISED RECORDS.--WSP 2104:
Drainage area.
GAGE.--Water-stage recorder. Datum of gage
is 813.7
ft above National
Geodetic Vertical Datum of 1929 (North
Carolina State Highway
Commission bench mark).
REMARKS. --No estimateddaily
drainage
discharges. Records good. A Soil Conservation Service flood -control dam on upstream
tributary, area 4.7 mit with flood storage of 695 acre -ft was completed on
dischazgo: 9,400 ft3/s, from rating curve extended above 2,700 ftS/s on basis of slope
June 21, 1977. Maximum
-area measurement; gage
height: 17.86 ft.
DISCHARGE,
CUBIC FEET PER
SECOND,
WATER YEAR OCTOBER 1991 TO SEPTEMBER
1992
DAILY
MEAN VALUES
DAY OCT NOV
DEC
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
1 12 18
74
29
26
36
29
30
27
32
16
24
2 13 18
135
26
25
34
28
28
24
38
13
18
3 13 18
212
86
25
32
27,
25
23
51
14
18
4 13 18
102
523
25
30
27
23
95
29
14
23
5 12 18
43
118
25
28
28
29
126
23
13
351
6 26 18
32
58
25
45
26
37
56
28
13
72
7 16 18
28
42
24
212
26
29
37
23
14
42
8 15 18
25
35
24
75
26
60
497
21
14
31
9 14 19
25
34
23
49
25
55
449
20
14
26
10 15 58
29
31
23
51
25
42
222
19
12
31
11 15 28
24
28
24
193
25
34
126
18
11
145
12 15 21
23
27
24
70
25
29
95
17
12
51
13 15 19
23
27
25
48
24
43
69
16
624
38
14 15 18
24
28
24
40
23
97
71
15
169
33
15 16 18
22
26
51
36
23
36
93
15
54
29
16 17 18
21
25
61
32
23
29
70
20
32
27
17 17 18
21
25
38
31
24
26
44
17
25
26
18 17 17
21
24
38
31
23
26
38
17
23
24
19 17 17
19
24
35
33
22
29
35
16
20
24
20 17 18
20
24
31
30
26
25
33
15
18
52
21 17 18
20
23
29
28
584
22
29
14
18
35
22 '17 22
20
23
28
28
376
21
27
14
18
30
23 18 23
21
58
31
28
111
20
25
32
18
28
24 18 19
23
66
46
26
63
20
25
21
18
25
25 19 18
20
41
106
26
48
20
25
25
18
24
26 19 17
20
35
235
77
42
25
25
18
17
25
27 19 17
20
31
93
52
37
23
27
16
19
29
28 19 17
35
30
56
38
36
25
23
15
30
36
29 19 17
128
29
44
33
36
38
22
13
22
38
30 18 17
51
28
---
32
33
51
21
12
18
29
31 18 ---
35
27
---
31
---
35
---
14
18
---
TOTAL 511 598
1316
1631
1264
1535
1871
1032
2479
644
1339
1384
MEAN 16.5 19.9
42.5
52.6
43.6
49.5
62.4
33.3
82.6
20.8
43.1
46.1
MAX 26 58
212
523
235
212
584
97
497
51
624
351
MIN 12 17
19
23
23
26
22
20
21
12
11
18
CFSM .39 .47
.99
1.23
1.02
1.16
1.46
.78
1.93
.49
1.01
1.08
IN. .44 .52
1.14
1.42
1.10
1.33
1.63
.90
2.15
.56
1.16
1.20
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960
- 1992,
BY WATER YEAR (WY)
MEAN 39.4 31.4
48.1
57.0
67.4
79.8
61.1
48.0
41.9
33.7
31.1
28.5
MAX 171 79.9
113
136
163
250
217
154
155
128
120
172
(WY) 1991 1986
1974
1978
1990
1975
1967
1964
1962
1978
1970
1979
MIN 7.47 11.2
16.4
17.2
25.0
20.1
18.0
14.0
7.15
4.27
6.48
5.08
(WY) 1987 1968
1966
1981
1977
1967
1967
1986
1986
1986
1986
1968
SUMMARY STATISTICS
FOR
1991 CALENDAR YEAR
FOR 1992 WATER YEAR
WATER YEARS 1960 - 1992
ANNUAL TOTAL
18117
15604
ANNUAL MEAN
49.6
42.6
47.1
HIGHEST ANNUAL MEAN
75.2
1990
LOWEST ANNUAL MEAN
22.1
1967
HIGHEST DAILY MEAN
1540
Mar 29
624
Aug 13
3350
Jun
21 1972
LOWEST DAILY MEAN
12
Sep 22
11
Aug 11
1.6
Auq
2 1977
ANNUAL SEVEN-DAY MINIMUM
12
Sep 29
13
Aug 6
2.3
Jul
28 1986
INSTANTANEOUS PEAK FLOW
2730
Jun 8
9400*
Sep
22 1979
INSTANTANEOUS PEAK STAGE
7.96
Jun 8
20.29
Sep
22 1979
INSTANTANEOUS LOW FLAW
11Aug
11
1.3
Aug
2 1977
ANNUAL RUNOFF (CFSM)
1.16
1.00
1.10
ANNUAL RUNOFF (INCHES)
15.75
13.56
14.95
10 PERCENT EXCEEDS
77
67
73
50 PERCENT EXCEEDS
30
25
26
90 PERCENT EXCEEDS
15
16
12
* See REMARKS.

Permit No. NCO028746
F. Low Flow Study Reopener
Upon submittal to the Division of a low flow study which provides an estimate of the 7Q10 flow
of the tributary to Bushy Creek, the Division will reopen the permit and reevaluate the
toxicity testing and ammonia requirements of this permit. To assure quality, the methods used in
the study must be approved by the Division and the permittee will coordinate closely with the
Division and the United States Geological Survey in gathering data.

Procedures for Projecting 7 Low Flow Statistics
At An Unpaged Site
This summary is provided to assist in the development of data to
determine an acceptable projection of the low flow statistics (7Q10, 30Q2)
at stream sites where current information available to DEM yields zero 7Q 10
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
r
State. Therefore, estimates of the 7Q10 and the 30Q2 for streams where no
actual data has been collected are based on data collected at nearbystreams
ams
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 for 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
gages) and, using a correlation curve with the 7Q10 and 30Q2 of the
gaged
stream, project the 7Q10 and 30Q2 at the proposed site.

-TTfe accuracy of the low flow estimates thus determined depends largely
on how well the streamf lows compare - are the streams
hydrologically similar
acid if they are similar, how well the relation between the 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 S-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. Streamflow 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, 30Q2) 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 Water Resources Division
WQ Section/Technical Services Branch USGS --
PO Box 27687 Raleigh, North Carolina 27602
Raleigh, North Carolina 27611-27687
2

V* _ � -
Include with this request a detailed studylan describing ibing the following:
1. The 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 w
flow at this site is expected. why a positive 7Q10
The study must not begin until written approval of the
plan is received from
DEM.
References
USGS - Techniques of Water Resources -Investigations.
Book 3, Chapter A6. General procedures for gaging stream
R.W. Carter.and J. Davidian. 1968. g g s'
Book 3, Chapter A8. Discharge measurements ata in
T.J. Buchananan and W.P. Somers. 1969. g g 8 stations.
Book 3, Chapter A14. Use of flumes in measurin di
F.A. Kilpatrick and V.R. Schneider. 1983. g scharge.
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. N
lina Department of Water and Air Resources. orth Caro-
- 3 -

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