NC0085707_Report_20010727

optimizing environmental resources ♦ water, air, earth
July 27,2001
Mr. Michael Myers, Environmental Engineer
NPDES Unit - Room 925C
Division of Water Quality
North Carolina Department of Environment and Natural Resources
512 North Salisbury Street
Raleigh, North Carolina 27604
RE: Final Report - Diffuser Dye Performance Test
Cape Hatteras Water Treatment Plant
Effluent Discharge to the Pamlico Sound
NPDES Permit No. NC0085707
Dear Mr. Myers:
rAeTer
011184
AquAeTer Inc. (AquAeTer) is pleased to present this Final Report regarding the diffuser dye
performance test conducted on May 15-16, 2001. This Final Report is being submitted on behalf of Mr.
John Contestable; Frisco Plant Superintendent; Dare County, NC - Water Department. The test was
conducted to determine the mixing around the Cape Hatteras Water Treatment Plant (WTP) discharge to
Pamlico Sound. The study was conducted according to the Work Plan approved by the North Carolina
Department of Environment and Natural Resources (NCDENR), as part of the National Pollutant
Discharge Elimination System (NPDES) permit for the RO reject discharge. The study methodology
complied with the requirements specified in Section A (3) of NPDES Permit No. NC0085707.
The report presents detailed information on the methodology used, the field data compiled, and
the estimated dispersion in the study area for the Sound and weather conditions encountered. During the
test, the Sound was calm and the weather was very mild, which were the conditions desired by NCDENR.
With these ambient conditions, the dispersion estimates measured should be fairly conservative with
respect to normal conditions in the study area.
If you should have questions or comments concerning this report, please contact us by telephone
at [phone], by FAX at [phone], or by e-mail at [e-mail] or
mcorn acuaeter com.
Sincerely,
AquAeTer, Inc.
Ray "J.LLawii
P.E.
Tee
JJ k4ift,
Michael R. Com, P.E.
President
P.O. Box 1187 ♦ Brentwood, Tri ♦ 37024-1187 ♦ Phone [phone] Fax [phone]

DYE PERFORMANCE TEST
CAPE HATTERAS WATER TREATMENT PLANT
EFFLUENT DISCHARGE TO PAMLICO SOUND
NPDES PERMIT NO. NCO085707
, ;mV
DARE COUNTY WATER - CHS
FRISCO, NORTH CAROLINA
00
AqueTer A
215 JAMESTOWN PARK, SUITE 100 7340 EAST CALEY AVE., SUITE 200
BRENTWOOD, TN 37027 CENTENNIAL, CO 80111
[phone] [phone]
JULY 2001
uptimi-mg environmental revmrres - wmer. air, canh

-
r
optimlzing environmental resources ♦ water, air, earth
July 27, 2001
Mr. John Contestable, Frisco Plant Superintendent
Dare County Water — CHS
,. 50253 Water Association Road
Frisco, North Carolina 27936
RE: Final Report - Diffuser Dye Performance Test
Cape Hatteras Water Treatment Plant
Effluent Discharge to the Pamlico Sound
NPDES Permit No. NCO085707
r
Dear Mr. Contestable:
011184
r AquAeTer Inc. (AquAeTer) is pleased to present this Final Report regarding the diffuser dye
performance test conducted on May 15-16, 2001. The test was conducted to determine the mixing around
the Cape Hatteras Water Treatment Plant (WTP) discharge to Pamlico Sound. The study was conducted
r according to the Work Plan approved by the North Carolina Department of Environment and Natural
Resources (NCDENR), as part of the National Pollutant Discharge Elimination System (NPDES) permit
for the RO reject discharge. The study methodology complied with the requirements specified in Section
A(3) of NPDES Permit No. NC0085707.
The report presents detailed information on the methodology used, the field data compiled, and
r the estimated dispersion in the study area for the Sound and weather conditions encountered. During the
test, the Sound was calm and the weather was very mild, which were the conditions desired by NCDENR.
With these ambient conditions, the dispersion estimates measured should be fairly conservative with
_ respect to normal conditions in the study area.
We have also forwarded a copy of the Final Report to Mr. Michael Myers, Environmental
Engineer, NPDES Unit, Division of Water Quality, North Carolina Department of Environment and
— Natural Resources as required by your NPDES Permit.
We appreciate the opportunity of working with you on this study. If you should have questions or
— comments concerning this report, please contact us by telephone at [phone], by FAX at (615) 373-
8512, or by e-mail at rlawing(a acuaeter.com or mcom@aauaeter mm.
.� Sincerely,
AquAeTTeer, In .
Rayon. Lawin , E.
Technical Director
JIB,;, R.
Michael R. Corn, P.E.
President
P.O. Box 1187 ♦ Brentwood, TN ♦ 37024-1187 ♦ Phone [phone] Fax [phone]

DYE PERFORMANCE TEST
CAPE HATTERAS WATER TREATMENT PLANT
EFFLUENT DISCHARGE TO PAMLICO SOUND
INTRODUCTION
The objective of this dye dispersion test was to determine the mixing around the Cape
Hatteras Water Treatment Plant (WTP) discharge to Pamlico Sound, located as shown on Figure
1. This discharge is the reject stream from a reverse osmosis (RO) anion exchange (AE) water
treatment plant with a total design effluent flow at about 1.8 million gallons per day (mgd). The
WTP processes brackish water from 300 ft deep wells for domestic and commercial water
supply. The RO reject has a conductivity of/around 36.000 microsemens per centimeter S/cm
.. or microSiemens/cm or micromhos/cm) and the Pamlico Sound water has a conductivity of
round 26 700 S /cm. The plant is currently discharging about 510 gallons per minute (gpm) or
about 0.734 mg . Additional information pertaining to the WTP is provided in Appendix 1.
The North Carolina Department of Environment and Natural Resources (NCDENR), as
part of the National Pollutant Discharge Elimination System (NPDES) permit for the RO reject
., discharge, required the WTP to perform a diffuser performance test. NCDENR specified a
sampling approach and a sampling grid around the submerged diffuser and a sampling frequency
for collecting both dye and salinity/conductivity. t4 swaj 0",L U., 7-ee.ar
METHODOLOGY
The activities completed to conduct this diffuser dye performance are described in the
following sections. The basic study methodology was specified by NCDENR in the NPDES
Permit for the Cape Hatteras Water Treatment Plant.
Cape Hatteras WTP
A continuous discharge of the reject stream occurred beginning on June 14, 2001 and
continued through June 16, 2001. Conductivity was monitored in the RO/AE reject stream at the
WTP about once every 4 hours. The WTP recorded effluent conductivity on a frequent basis
during the study period. The WTP also kept a record of effluent flow during the study period.
Station Locations
On the day prior to the dye study, three- to eight -foot long stakes were placed at the
monitoring station locations specified in the NPDES Permit and shown on Figures 2 and 3. A
Laser Rangefinder was used to place the stakes at the specified monitoring station locations. As
nighttime navigation aids, battery -operated boat lights were placed on the top of the stakes
located at the monitoring stations in the outermost ring. The effluent diffuser, as shown in the

Dye Performance Test -Cape Hatteras Water Treatment Plant 011184
June 27, 2001 Page 2
design drawing presented in Figure 4, is located in the center of the 10-meter ring in about 2 feet
of water.
Temporary staff gages were placed at monitoring stations 1 and 21 to allow tidal stage
y
_
changes to be monitored during the diffuser dye performance study. The staff gages were made
z"P
from metal fence posts and 8-foot woodenlx2s with a piece of fiberglass tape attached to the
• o/a,,
N wood. Mid -depth current velocity measurements were made near monitoring station o 2 over
C'
�)'
several tidal cycles using a Wading Rod and Pygmy Velocity Meter. LWater depth, background
'�iznj
=C
fluorescence, conductivity, and water temperature were determined at each monitoring station
prior to initiation of dye injection.3 Because of the shallow depths, all fluorescence and water
quality measurements were made at approximate) mid -depth at each monitoring station.
.. Dye Injection
_ A Fluid Metering Injection (FMI) pump was used to continuously inject a dye solution
made up of 20 percent solution Rhodamine WT dye (concentration of 2 x 108 ppb) and tap water
into the effluent of the Cape Hatteras WTP. The dye was injected at a rate of 12- to 16-
milliliters per minute (ml/min) into the wastewater sampling port located about 300 to 400 feet
_ upstream from the diffuser header. Complete mix of the reject stream and the dye should have
occurred prior to discharge through the diffuser. The dye injection rate was checked prior to test
initiation, at 8 to 10 hour intervals, and at the end of the test by metering the dye discharge into a
1-L graduated cylinder for a 1 to 2-minute period. This test was performed in triplicate each
time the pump flow rate was checked. The injection of dye into the effluent discharge line was
initiated at approximately 1400 on May 15, 2001 and was continued until 1500 on May 16, 2001.
Effluent Plume Monitoring in Pamlico Sound
Water depths were measured using a six-foot folding Engineer's rule. A Turner Model
_ 10 continuous flow fluorometer was used to monitor the injected Rhodamine WT dye and a
Hydrolab Series 3 Datasonde was used to monitor temperature and conductivity in the Sound.
The fluorometer was calibrated prior to tudy using serial dilutions of Rhode
_ dye made from the concentrated dye t 2 x 1 Os p b own to dye concentrations in th to 10 b
r e_Zhe_ivdrolah wa¢ also calibrated prior to the field study using conductivity standards of
30,100 S and 16,630� The calibration of both instruments was also checked at
_ approximately 8 to 10-hr intervals during the dye study and at the end of the study.
d�

Dye Performance Test - Cape Hatteras Water Treatment Plant 011184
June 27, 2001 Page 3
The effluent plume from the diffuser was monitored according to the following general schedule
following initiation of the dye injection at 1400 on May 15, 2001:
Date
Time
Date
Time
q
`
05/15
1300 `o`aw
05/16
0800
05115
1800
05116
1000
05115
2200
05/16
1200
05/16
0200
05116
1400
05/16
0600
The measurements taken at 1300 on May 151h represented background readings for each
_ monitoring station.
All measurements were made at about mid -depth at each station. The Sound water was
pumped to the Fluorometer using a Little Giant submersible pump. Sound water was pumped a
.. minimum of 2 minutes through the fluorometer to allow removal of previous water in the hoses.
A reading was taken once the fluorometer reading stabilized. At some monitoring stations
_ especially close to the diffuser, turbulence caused the fluorometer readings to be erratic. In these
cases, a range of fluorometer readings was recorded. A complete sampling cycle required
approximately 60 minutes to complete. During each sampling cycle, monitoring was conducted
according to the following sequence:
Distance from Diffuser
10 m
50 m
100 m
200 m
Monitoring Sequence
1, 2, 3, 4, 5, 6, 7, 8
9, 10, 11, 12, 13
18, 17, 16, 15, 14
23, 22, 21, 20, 19
All measurements were recorded on Data Sheets. The information presented on the Data
Sheet for each Monitoring Station included:
.. ♦
Date
♦
Time
♦
Depth (ft)
— ♦
Fluorometer Reading
♦
Conductivity (ms)
♦
Water Temperature (F)
.. ♦
Wind Speed / Direction
♦
Crew
♦
Comments (Sample Type and/or Staff Gage Reading)

am
OR
0"
Dye Performance Test - Cape Hatteras Water Treatment Plant 011184
June 27, 2001 Page 4
Background Conductivity Measurements
A continuous recording Hydrolab DataSonde 3 was placed in the first canal west of the
study area to measure background Specific conductance at 25 °C (conductivity) for about a 48-hr
period beginning about 24 hrs before the study begins. Unfortunately, the recording device
failed and the readings were lost. The continuous recording Hydrolab DataSonde 3 was re-
deployed near the upper end of the canal and allowed to accumulate conductivity data for about a
13-hr period after conclusion of the field study. Background temperature and conductivity was
recorded on 15-minute intervals. The continuous recording datasonde was calibrated prior to its
placement in the background location and after it was removed.
RESULTS AND DISPERSION ANALYSES
The field data compiled during this study and the associated dispersion analyses are
presented in the following sections. Copies of the Field Data Sheets and the Field Book Notes
are included in Appendix 2. A series of photographs documenting various study activities are
presented in Appendix 3. Descriptions are provided with each photograph.
Cape Hatteras WTP
A summary of the . effluent monitoring data collected by WTP personnel during the
diffuser dye performance study is presented in Table 1. During the study the effluent discharge
rate was 516 gallons per minute (gpm) and the effluent temperature at the plant was 16.8 °C
(62.20). The conductivity ranged from 37,800- to 40,100- S / cm with an average value of
39,500 S/cm.
Ambient Conditions
General ambient conditions in the study area on June 15-16, 2001 are summarized below:
,.s Phase of the Moon Last Quarter
Tidal Cycles Covered Two Full
Tidal Fluctuation 0.2 Ft
Wind Direction Varied - North to East
Wind Speed Calm - Mild
Current Velocity (Range) 0.00 — 0.27 fps
�+ Current Velocity (Average) 0.14 fps
No precipitation occurred during the study. The water was very calm except for one short period
of mild swells. A summary of the wind direction during each monitoring period is presented in
Table 2. A summary of tide data for Cape Hatteras is presented in Table 3. This Table shows the
M

OR
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4"
Dye Performance Test - Cape Hatteras Water Treatment Plant 011184
June 27, 2001 Page 5
approximate stage of the tidal cycle for each of the study monitoring cycles. The temporary staff
gage readings for the staff gages located at Monitoring Stations 1 and 21 are presented in Table
4. The current velocity measurements taken during the study are presented in Table 5 and shown
graphically in Figure 5. Due to the clam winds and small tidal fluctuation, current velocities
were very low during the study. Current velocities in the vicinity of the diffuser are also probably
impacted by the irregularities of the shoreline in the study area, as shown previously in Figure 2.
Background temperature and conductivity measurements recorded at the dock in the fist canal
west of the study are presented in Table 6. There was negligible change in conductivity over the
15 hours surveyed at the background station near the head of the canal in Brigand Bay.
Monitoring Station Data
The monitoring station data collected are presented by monitoring cycle in Tables 7
through 15 beginning with the collection of background data at 1300 on May 15`h and continuing
through 1400 on May 16`h. The data presented for each monitoring cycle includes:
♦ Date
„^ ♦ Monitoring Cycle
♦ Tidal Period
♦ Wind Direction (from)
►� ♦ Date and Time
♦ Monitoring Station
♦ Water Depth (R)
♦ Fluorometer Reading
♦ Conductivity ( S /cm)
♦ Temperature (OF)
The maximums, minimums, and averages are also presented for water depth, conductivity, and
temperature for each monitoring cycle. These statistical values are also summarized in Table 16.
�' The tidal cycle maximums, minimums, and averages for these constituents are presented at the
bottom of this table. Tidal Cycle ranges and averages over all the monitoring stations for these
water quality constituents during the study period were as follows:
Station Water Depth (Range) 1.1— 2.8 R
Station Water Depth (Average) 1.8 R
Station Water Conductivity (Range) 32,000 — 36,100 S/cm
Station Water Conductivity (Range) 33,700 S/cm
Station Water Temperature (Range) 63.3 — 71.5 OF
Station Water Temperature (Average) 66.7 OF
am
No

M1
Dye Performance Test - Cape Hatteras Water Treatment Plant 011184
am June 27, 2001 Page 6
Dye Injection
Based on an effluent flow rate of approximately 510 gallons per minute (gpm) and a
target dye concentration of 10- to 20-parts per billion (ppb) in the Sound, a dye solution was
prepared for injection into the effluent stream. The dye mixture was composed of three (3) liters
of Rhodamine WT dye (20% solution) with a dye concentration of 2 x 108 ppb and 32 liters of
tap water (community well water). The 35-liter dye mixture had a resultant dye concentration of
17,142,857.1429 ppb. The target injection rate for the dye mixture was 12- to 15- milliliters per
minute (mL/min). .
The flow rate of the Fluid Metering Injection (FMI) pump was checked before dye
injection was initiated, periodically during the study, and after the study was completed. A
summary of the pump calibration tests is presented in Table 17. All checks were completed in
triplicate. Since the pump was operated near the low end of its operating range, the dye injection
rate drifted upward during the course of the study as shown below:
Date And Flow Rate
Time mL, mi
05/15/01 14:00 11.18
05/15/01 23.15 13.55
05/16/01 7:33 16.26
05/16/01 15:54 16.59
Using the effluent flow rate of 516-gpm and the resultant dye concentration of the dye mixture,
dye delivery concentrations at the diffuser were calculated for each of these flow rates. The
calculated dye delivery rates are presented in Table 18 and shown graphically in Figure 6 with a
best -fit line. This equation was used to calculate the dye delivery concentration for various flow
rates rather than use an average flow rate for the entire study. This equation was developed
using serial dates as represented in Microsoft Excel.
Fluorometer Readings
The fluorometer calibration was checked against standard dye concentration samples
prior to the field study to ensure that the instrument was operating properly. The relationship
between dye concentration and fluorometer reading was determined after the field monitoring
activities were completed to determine a range of fluorometer readings for standard dye
concentrations ranging from 2- to 50-ppb. These data are presented in Table 19 and shown
graphically in Figure 7 with a best -fit line. This equation was used to calculate the base
fluorometer readings for the range of dye injection pumping rates that occurred during the study.
The calculated base fluorometer readings for each of the monitoring cycles are presented in
�+ Table 20.
PM

I+
0"
Dye Performance Test - Cape Hatteras Water Treatment Plant 011184
June 27, 2001 Page 7
Dispersion Analyses Results and Conclusions
Dispersion estimates for each monitoring cycle are presented in Tables 21 through 29 and
shown graphically in Figures 8 through 15. Dispersion values were calculated by dividing each
monitoring station fluorometer reading by its respective monitoring cycle base fluorometer
reading. The calculated dispersion values were plotted on scale drawings at their respective
monitoring station locations and isopleths drawn for various dispersion values.
The tidal period, wind direction (from), calculated effluent dye concentration, and calculated
base fluorometer reading for the monitoring cycle are presented on each Table. The tidal period
and wind direction are also shown on the Figures. The dispersion estimates for -the_ 10-meter
circle are as follows:
Monitoring
Cycle
Lowest Dispersion
Average Dispersion
5115101
1800
5.3:1
24.4:1
5115101
2200
21:1
_2.8 :1
5/16/01
0200
3.6:1
9.0:1
5/16/01
0600
3.9:1
8.7:1
5/16/01
0800
5.2:1
10.8:1
5/16/01
1000
5.4:1
14.3:1
5/16/01
1200
6.6:1
19.2:1
5/16/01
1400
5.8:1
38.2:1
Based on the dispersion estimates within the 10-meter circle and the overall data shown in the
Tables and Figures, dispersion in the system appears to be primarily wind -driven. Based on the
mild conditions encountered during this study, the dispersion estimates presented should be
fairly conservative for conditions that typically exist in the Sound in the vicinity of the Cape
Hatteras Water Treatment Plant wastewater effluent diffuser.
OM
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MR
fm
om
MR
MR
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ow
TABLE 1. WATER TREATMENT PLANT EFFLUENT MONITORING DATA 011184
DIFFUSER DYE PERFORMANCE STUDY .
CAPE HATTERAS WATER TREATMENT PLANT
DATE
DAY
TIME
FLOW
(gpm)
CONDUCTIVITY
(us/cm)
TEMPERATURE
(°C)
(OF)
5115101
Tuesday
9:00
516
40,100
16.8
62.2
11:00
516
39,800
16.8
62.2
13:00
516
39,900
16.8
62.2
15:00
516
37,800
16.8
62.2
17:00
516
38,500
16.8
62.2
19:00
516
39,700
16.8
62.2
23:00
516
39,600
16.8
62.2
5/16/01
Wednesday
2:00
516
39,500
16.8
62.2
4:00
516
39,700
16.8
62.2
7:00
516
39,800
16.8
62.2
10:00
516
39,400
16.8
62.2
13 :00
516
40,100
16.8
62.2
15:00 1
516
39,600
16.8
62.2
NIINIMUM 37,800
MAXIMUM 40,100
AVERAGE 39,500
im NOTE: DATA PROVIDED BY TERRY GOLDMAN, CAPE HATTERAS WATER TREATMENT PLANT.
fm
FM
f"
sm

MM
TABLE 2. GENERAL WIND DIRECTION DATA 011184
MR DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
fm
p"
MR
fm
DATE
TIME
WIND
DIRECTION
TIDAL STAGE
5115101
13:00
NORTH
5/8 - 3/4 Flood
5115101
14:00
NORTH
7/8 Flood
5115101
18:00
EAST
1/2 - 5/8 Ebb
5115101
22:00
EAST
1/4 - 3/8 Flood
5115101
2:00
NORTH-NORTHEAST
7/8 Flood - High Tide - 1/8 Ebb
5115101
6:00
NORTH-NORTHEAST
3/8 -5/8 Ebb
5115101
8:00
NORTH
3/4 - 7/8 Ebb
5115101
10:00
NORTH
Low Tide - 1/4 Flood
5115101
12:00
NORTH
3/8 - 1/2 Flood
5115101
14:00
NORTH-NORTHEAST
3/4 - 7/8 Flood
mm NOTE: TIDAL STAGE INFORMATION TAKEN FROM TABLE 3.
R,
Im
am
am
MR
mm
om

MR
M-' TABLE 3. TIDE DATA FOR HATTERAS INLET 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
MR
mm
MR
MR
MR
m
fmq
m"
m"
mm
m"
m
DATE
TIME
DATE AND
TIME
TIDAL STAGE
MONITORING
CYCLE
TABLE
ADJUSTED
5/14/01
19:15
19:41
5/14/01 19:41
Low Tide
5115101
1:46
2:01
5/15/01 2:01
High Tide
5115101
8:28
8:54
5/15/01 8:54
Low Tide
51151019:38
1/8
Flood
5/15/0110:22
1/4
Flood
5/15/0111:06
3/8
Flood
511510111:51
1/2
Flood
5/15/0112:35
5/8
Flood
511510113:19
3/4
Flood
Background
511510114:03
7/8
Flood
5115101
14:33
14:48
5115101 14:48
High Tide
5/15/01 15:32
1/8
Ebb
5/15/01 16:17
1/4
Ebb
5115101 17:02
3/8
Ebb
5115101 17:47
1/2
Ebb
1800
5115101 18:31
5/8
Ebb
511510119:16
3/4
Ebb
5115101 20:01
7/8
Ebb
5115101
20:20
20:46
5115101 20:46
Low Tide
5/15/0121:32
1/8
Flood
5/15/0122:18
1/4
Flood
2200
5/ 15101 23:05
3/8
Flood
511510123:51
1/2
Flood
5/16/010:37
5/8
Flood
51161011:24
3/4
Flood
5/16/012:10
7/8
Flood
0200
5/16/01
2:42
2:57
5/16/01 2:57
High Tide
5116101 3:47
1/8
Ebb
5/16/01 4:38
1/4
Ebb
5/16/015:29
3/8
Ebb
0600
5116101 6:20
1/2
Ebb
5/16/017:10
5/8
Ebb
5/16/01 8:01
3/4
Ebb
0800
5/16/018:52
7/8
Ebb
5/16/01
9:17
9:43
5/16/01 9:43
Low Tide
1000
5/16/0110:28
1/8
Flood
5/16/0111:13
1/4 -
Flood
5/16/0111:58
3/8
Flood
1200
5/16/0112:44
1/2
Flood
511610113:29
5/8
Flood
5116101 14:14
3/4
Flood
1400
5/16/0114:59
7/8
Flood
5/16/01
15:30 1
15:45
5/16/01 15:45
High Tide
M Note: Thninig of tides adjusted per instructions on Tide Tables.

MR
T T
m
ON
em
MR
F"
F,
lwq
fop
mm
TABLE 4. TEMPORARY STAFF GAGE READINGS
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
STATION 1
DATE
TIME
READING
(ft)
5/14/01
15:58
2.4
5115101
9:52
2.4
511-5101
10:12
2.2
5115101
11:00
2.3
5115101
12:10
2.3
5115101
12:26
2.3
5115101
13:40
2.3
5115101
15:20
2.4
5115101
16:04
2.3
5115101
17:20
2.3
5115101
17:56
2.2
5/15101
22:02
2.3
5116101
2:17
2.4
5/16/01
5:58
2.4
5116101
7:55
2.3
5116101
9:03
2.3
5116101
9:57
2.2
5/16/01
10:54
2.2
5116101
11:58
2.2
5/16/01
12:50
2.2
5/16/01
13:56
2.2
5/16/01
14:57
2.2
muNrnnrM
2.2
MAXIMUM
2.4
RANGE
0.2
011184
STATION 21
DATE
TIME
READING
(ft)
5115101
10:37
11.2
5115101
18:43
11.2
5115101
22:56
11.2
5116101
3:43
11.3
5/16/01
6:38
11.4
5/16/01
8:40
11.2
5116101
10:40
11.2
5/16/01
12:38
11.2
5/16/01
14:42
11.2
MINIMUM 11.2
MAXEM UM 11.4
RANGE 0.2
NOTE: NEITHER TEMPORARY STAFF GAGE REFERENCED TO PERMANENT DATUM.

OR
FIn
ON
go
on
MR
MR
fm
sm
Fie
Im
MR
Fm
TABLE 5. CURRENT VELOCITY MEASUREMENTS
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
TIME
DATE AND
TIME
TOTAL TIME
(sec)
NUMBER OF
REVOLUTIONS
VELOCITY
(ft/sec)
5/14/01
14:34
5/14/0114:34
43
8
0.21
5/14/01
15:08
5/14/0115:08
43
6
0.17
5/14/01
15:58
5/14/0115:58
55
6
0.13
5/14/01
16:55
5/14/0116:55
41
10
0.27
5/14/01
17:57
5/14/0117:57
41
6
0.17
5115101
8:13
5/15/018:13
50
0
0.00
5115101
9:11
5/15/01 9:11
50
0
0.00
5115101
10:00
5115101 10:00
45
1
0.00
5115101
11:00
511510111:00
46
2
0.00
5115101
12:15
5/15/0112:15
46
1 6
0.17
5115101
14:01
5115101 14:01
43
5
0.14
5115101
15:03
5115101 15:03
44
5
0.14
5115101
16:03
511510116:03
41
8
0.22
5115101
17:18
5115101 17:18
42
3
0.10
5115101
17:59
511510117:59
45
3
0.09
5115101
22:07
511510122:07
52
4
0.10
5/16/01
2:08
5/16/012:08
42
6
0.17
5/16/01
6:52
5/16/016:52
43
7
0.19
5116101
8:01
5/ 16/01 8:01
40 1
8
0.22
5/16/01
9:03
5/ 16/01 9:03
44
4
0.12
5/16/01
10:00
5/16/01 10:00
42
8
0.21
5116101
10:54
511610110:54
59
3
0.08
5/16/01
11:58
511610111:58
45
8
0.20
5/16/01
12:50
5/16/0112:50
41
7
0.20
5/16/01
14:00
5/16/0114:00
47
8
0.20
5/16/01
14:57
511610114:57
45
7
0.18
1vmvIMUM 0.00
MAXIMUM 0.27
AVERAGE 0.14
NOTE: VELOCITY TAKEN FROM RATING TABLE 1205-19 FOR MODEL 1205 MM METER.

on
am
FM
m"
am
fm
am
wo
w
Im
No
mo
a"
TABLE 6. BACKGROUND TEMPERATURE AND CONDUCTIVITY DATA
HEAD OF FIRST CANAL IN BRIGAND BAY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
TIME
TEMPERATURE
CONDUCTIVITY
(us/cm)
(°C)
(OF)
5/16/01
16:30
21.7
71.0
34,200
5/16/01
17:00
21.6
70.9
34,300
5/16/01
17:30
21.8
71.2
34,300
5/16/01
18:00
21.7
71.0
34,300
5/16/01
18:30
21.6
70.9
34,300
5/16/01
19:00
21.4
70.6
34,300
5/16/01
19:30
21.3
70.3
34,300
5/16/01
20:00
21.1
70.0
34,400
5/16/01
20:30
21.0
69.7
34,400
5/16/01
21:00
20.9
69.6
34,400
5/16/01
21:30
20.8
69.4
34,400
5/16/01
22:00
20.7
69.3
34,400
5/16/01
22:30
20.6
69.0
34,400
5/16/01
23:00
20.6
69.0
34,400
5/16/01
23:30
20.5
68.9
343,400
5/17/01
0:00
20.4
68.7
34,400
5/17/01
0:30
20.3
68.6
34,400
5/17/01
1:00
20.3
68.5
34,400
5/17/01
1:30
20.2
68.3
34,500
5/17/01
2:00
20.1
68.1
34,400
5/17/01
2:30
20.0
68.1
34,500
5/17/01
3:00
20.0
67.9
34,500
5/17/01
3:30
19.8
67.6
34,500
5/17/01
4:00
19.7
67.4
34,400
5/17/01
4:30
19.5
67.2
34,500
5/17/01
5:00
19.4
67.0
34,500
5/17/01
5:30
19.3
66.7
34,400
5/17/01
6:00
19.2
66.6
34,400
5/17/01
6:30
19.1
66.5
34,400
5/17/01 1
7:00
19.0 1
66.2
34,400
5/17/01 1
7:30
19.0 1
66.2
34,400
MINIMUM
19.01
66.22
34,200
MAXIMUM
21.76
71.17
34,500
AVERAGE
20.40
68.72
34,394
mm

mo
FM
TABLE 7. FIELD DATA SUMMARY 011184
no DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
am
MR
m"
MR
am
po
PAR
ow
am
MR
on
DATE
MONITORING CYCLE
1300 (BACKGROUND)
TIDAL PERIOD
3/4 - 7/8 FLOOD TIDE
WIND DIRECTION (from)
NORTH
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(OF)
5/15/01 13:40
1
1.4
10
33.7
68.3
5/15/01 13:42
2
1.6
10
33.8
68.1
5/15/01 13:43
3
1.6
10
33.8
68.2
5/15/01 13:44
4
1.4
20
33.9
68.3
5/15/01 13:45
5
1.4
25
35.1
68.4
5/15/01 13:46
6
1.3
21
34.9
68.5
5/15/01 13:47
7
1.1
18
34.1
68.3
5/15/01 13:47
8
1.3
19
34.0
68.5
5/15/01 13:50
9
1.2
11
33.8
67.8
5/15/01 13:51
10
1.9
10
33.5
67.8
5/15/01 13:52
11
2.6
11
33.4
67.7
5/15/01 13:54
12
2.0
13
34.3
67.6
5/15/01 13:55
13
1.5
14
34.2
68.6
5/15/01 13:06
14
2.4
8
33.6
67.8
5/15/01 13:10
15
2.3
11
33.2
67.3
5/15/01 13:13
16
2.3
9
33.2
67.3
5/15/01 13:15
17
2.0
9
33.1
67.5
5/15/01 13:20
18
1.3
10
34.0
67.7
5/15/01 13:24
19
1.1
11
33.9
67.8
5/15/01 13:27
20
2.4
10
32.9
67.5
5/15/01 13:29
21
2.4
10
32.5
68.3
5/15/01 13:331
22
2.3
11
32.7
68.1
5/15/01 13:35
23
1.7
12 -+-33.0
67.8
STATION MINIMUM
1.1
32.5
67.3
STATION MAXIMUM
2.6
35.1
68.6
STATION AVERAGE
1.8
33.7
68.0
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
ON

pq
em
mm
Fm
mw
MR
p,
TABLE 8. FIELD DATA SUMMARY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5/15/01
MONITORING CYCLE
1800
TIDAL PERIOD
1/2 - 5/8 EBB TIDE
WIND DIRECTION (from)
EAST
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/CM)
TEMPERATURE
(°F)
5/15/01 17:56
1
1.7
330
34.6
68.3
5/15/01 18:00
2
1.6
141
34.1
68.0
5/15/01 18:01
3
1.6
349
34.6
68.1
5/15/01 18:03
4
1.4
341
33.9
68.1
5/15/01 18:04
5
1.3
128
33.8
68.2
5/15/01 18:05
6
1.3
94
33.9
68.3
5/15/01 18:06
7
1.2
20
33.7
68.3
5/15/01 18:07
8
1.2
70
33.9
68.3
5/15/01 18:10
9
1.2
12
33.6
68.2
5/15/01 18:12
10
2.0
34
33.4
67.9
5/15/01 18:14
11
2.6
145
33.6
68.0
5/15/01 18:17
12
2.1
11
33.6
67.9
5/15/01 18:19 -
13
1.3
11
33.7
68.3
5/15/01 18:31
14
2.4
58
33.6
68.1
5/15/01 18:29
15
2.4
29
32.9
67.7
5/15/01 18:26
16
2.3
13
33.1
67.7
5/15/01 18:24
17
2.0
17
33.2
67.8
5/15/01 18:21
18
1.3
10
33.7
68.1
5/15/01 18:50
19
1.2
11
33.5
67.5
5/15/01 18:46
20
2.4
10
32.9
67.8
5/15/01 18:43
21
2.5
11
32.5
67.7
5/15/01 18:40
22
2.3
11
32.7
67.5
5/15/01 18:35
23
1.8
58
33.5
67.9
5/15/0117:45
Dock
-----
-----
33.8
69.2
5/15/0119:03
Dock
-----
-----
33.8 1
69.0
STATION MINIMUM
1.2
32.5
67.5
STATION MAXEM[UM
2.6
34.6
68.3
STATION AVERAGE
1.8
33.6
68.0
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
MR

m
wo
ow
on
am
Im
ma
A.
am
fm
MR
MR
TABLE 9. FIELD DATA SUMMARY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5115101
MONITORING CYCLE
2200
TIDAL PERIOD
1/4 - 3/8 FLOOD TIDE
WIND DIRECTION (from)
EAST
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/CM)
TEMPERATURE
(°F)
5/15/01 22:02
1
1.6
593
33.2
66.9
5/15/01 22:11
2
1.6
494
34.0
66.9
5/15101 22:13
3
1.6
739
33.6
66.9
5/15/01 22:15
4
1.5
787
33.6
67.1
5/15/01 22:16
5
1.4
811
33.9
67.1
5/15/01 22:17
6
1.3
843
33.9
67.2
5/15/01 22:20
7
1.2
910
33.7
66.9
5/15/01 22:23
8
1.4
797
33.8
66.8
5/15/01 22:28
9
1.2
24
33.6
66.3
5/15/01 22:27
10
1.8
59
33.2
66.5
5/15/01 22:32
11
2.8
11
33.0
66.5
5/15/01 22:34
12
2.1
7
33.2
66.4
5/15/01 22:35
13
1.5
8
33.5
66.4
5/15/01 22:48
14
2.3
93
33.5
66.5
5/15/01 22:45
15
2.3
46
33.0
66.7
5/15/01 22:43
16
2.4
111
32.6
66.8
5/15/01 22:41
17
2.1
8
32.8
66.5
5/15/01 22:38
18
1.2
23
33.4
66.3
5/15/01 23:03
19
1.2
8
33.2
66.2
5/15/01 23:00
20
2.4
8
32.3
66.6
5/15/01 22:56
21
2.4
7
32.2
66.7
5/15/01 22:53
22
2.3
8
32.7
66.4
5/15/01 22:50
23
1.7
30
33.2
66.4
5/15/0117:45
Dock
-----
-----
33.7
68.6
STATION MINIMUM
1.2
32.2
66.2
STATION MAXIMUM
2.8
34.0
67.2
STATION AVERAGE
1.8
33.3
66.7
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
pm

no
TABLE 10. FIELD DATA SUMMARY
ma DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
no
ow
pmq
p"
ON
m
m"
OR
ow
ma
011184
DATE
5/16/01
MONITORING CYCLE
0200
TIDAL PERIOD
7/8 FLOOD -1/8 EBB TIDE
WIND DIRECTION (from)
NORTH-NORTHEAST
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(OF)
5/16/01 2:17
1
1.6
120
33.9
65.2
5/16/01 2:21
2
1.7
145
33.7
65.3
5/16/01 2:22
3
1.7
150
33.7
65.2
5/16/01 2:23
4
1.5
386
34.0
65.4
5/16/01 2:25
5
1.6
582
35.4
65.8
5/16/01 2:26
6
1.5
409
34.7
65.6
5/16/01 2:27
7
1.3
363
34.4
65.4
5/16/01 2:28
8
1.5
421
34.5
65.4
5/16/01 2:31
9
1.5
37
33.8
65.6
5/16/01 2:33
10
2.0
83
33.5
66.3
5/16/01 2:35
11
2.7
119
33.3
65.2
5/16/01 2:37
12
2.2
214
33.5
65.2
5/16/01 2:39
13
1.6
151
34.0
64.8
5/16/01 3:31
14
2.5
24
33.4
64.8
5/16/01 2:50
15
2.5
33
32.9
65.4
5/16/01 2:47
16
2.5
43
32.7
65.6
5/16/01 2:45
17
2.2
49
33.0
65.4
5/16/01 2:42
18
1.5
170
34.0
65.0
5/16/01 3:46
19
1.5
153
34.0
64.6
5/16101 3:51
20
2.6
7
32.4
65.2
5/16/01 3:43
21
2.6
5
32.2
65.7
5/16/01 3:40
22
2.5
6
32.0
65.3
5/16/01 3:35
23
2.0
8
32.9
64.7
Dock-----
-----
-----
-----
STATION MINIMUM
1.3
32.0
64.6
STATION MAXIMUM
2.7
35.4
66.3
STATION AVERAGE
1.9
33.6
65.3
ow NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
am
m
mo

No
mm
OR
ow
MR
on
m
I"
mm
ow
TABLE 11. FIELD DATA SUMMARY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5/16/01
MONITORING CYCLE
0600
TIDAL PERIOD
3/8 FLOOD - 518 EBB TIDE
WIND DIRECTION (from)
NORTH-NORTHEAST
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(°F)
5/16/01 5:58
1
1.7
298
34.6
64.3
5/16/01 6:00
2
2.8
200
33.9
64.1
5/16/01 6:01
3
1.8
348
34.2
64.1
5/16/01 6:02
4
1.5
574
36.1
64.8
5/16/01 6:03
5
1.5
245
34.5
63.9
5/16/01 6:04
6
1.5
227
34.4
63.9
5/16/01 6:05
7
1.3
200
34.3
63.7
5/16/01 6:07
8
1.5
227
34.4
63.9
5/16/01 6:10
9
1.4
221
34.3
63.9
5/16/01 6:13
10
2.1
106
33.4
64.1
5/16/01 6:14
11
2.7
74
33.3
64.1
5/16/01 6:17
12
2.3
140
33.9
63.9
5/16/01 6:19
13
1.6
120
34.2
63.3
5/16/01 6:35
14
2.5
25
33.3
63.9
5/16/01 6:31
15
2.6
26
32.8
64.1
5/16/01 6:24
16
2.5
27
32.8
64.3
5/16/01 6:23
17
2.1
52
33.2
64.2
5/16/01 6:22
18
1.5
137
33.9
63.7
5/16/01 6:43
19
1.3
95
33.6
63.6
5/16/01 6:42
20
2.6
15
32.7
64.3
5/16/01 6:41
21
2.6
5
32.3
64.3
5/16/01 6:38
22
2.5
5
33.4
64.4
5/16/01 6:37
23
2.0
12
32.9
63.8
5/16/017:02
Dock
-----
18
33.9
66.8
STATION MINIMUM
1.3
32.3
63.3
STATION MAXIMUM
2.8
36.1
64.8
STATION AVERAGE
2.0
33.8
64.0
a" NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
am

MR
eye
mw
00
ow
I"
��
a*
am
No
MR
p"
TABLE 12. FIELD DATA SUMMARY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5/16/01
MONITORING CYCLE
0800
TIDAL PERIOD
3/4 - 7/8 EBB TIDE
WIND DIRECTION (from)
NORTH
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(OF)
5/16/01 7:55
1
1.6
310
34.8
64.1
5/16/01 7:58
2
1.8
218
34.5
63.7
5/16/01 8:00
3
1.8
272
35.0
64.2
5/16/01 8:02
4
1.6
444
35.3
64.5
5/16/01 8:03
5
1.6
409
34.3
64.0
5/16/01 8:04
6
1.4
106
33.9
63.7
5/16/01 8:05
7
1.2
119
34.0
63.6
5/16/01 8:07
8
1.5
130
34.1
63.6
5/16/01 8:09
9
1.3
142
34.3
63.5
5/16/01 8:11
10
2.0
80
33.2
64.1
5/16/01 8:13
11
2.7
78
33.2
64.3
5/16/01 8:15
12
2.1
47
33.2
64.3
5/16/01 8:18
13
1.6
76
33.4
63.8
5/16/01 8:30
14
2.4
157
34.7
64.1
5/16/01 8:28
15
2.4
61
33.3
64.4
5/16/01 8:26
16
2.4
62
33.1
64.5
5/16/01 8:23
17
2.0
65
33.5
64.0
5/16/01 8:21
18
1.4
94
33.7
63.9
5/16/01 8:47
19
1.2
45
33.4
63.6
5/16/01 8:43
20
2.5
5
33.2
64.2
5/16/01 8:40
21
2.5
5
32.6
64.6
5/16/01 8:36
22
2.4
19
32.5
64.5
5/16/01 8:33
23
1.8
51
33.6
64.4
5/16/017:46
Dock
-----
18
33.7
66.7
5/16/019:11
Dock
-----
23
33.7
66.9
STATION MINIMUM
1.2
32.5
63.5
STATION MAXIMUM
2.7
35.3
64.6
STATION AVERAGE
1.9
33.8
64.1
are
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
op
ow
Am

a'w
No
me
MR
r�
m"
ON
pm
ow
ow
aw
A"
ow
r._-�mj
am
TABLE 13. FIELD DATA SUMMARY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5/16/01
MONITORING CYCLE
1000
TIDAL PERIOD
1/8 -1/4 FLOOD TIDE
WIND DIRECTION (from)
NORTH
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(OF)
5/16101 9:57
1
1.5
242
34.2
65.6
5/16/01 9:58
2
1.6
245
34.4
65.6
5/16/01 10:00
3
1.6
344
34.9
66.0
5/16/01 10:02
4
1.4
443
35.4
66.2
5/16/01 10:03
5
1.4
251
34.0
65.5
5/16/01 10:04
6
1.3
100
33.9
65.5
5/16/01 10:05
7
1.1
98
33.7
65.6
5116/01 10:07
8
1.4
95
33.8
65.6
5/16/01 10:09
9
1.2
156
33.7
66.1
5/16/01 10:11
10
2.0
136
33.9
65.3
5/16/01 10:14
11
2.6
64
33.7
65.2
5/16/01 10:15
12
2.1
34
33.7
63.6
5/16/01 10:17
13
1.5
62
33.7
65.6
5/16/01 10:31
14
2.3
140
33.8
66.0
5/16/01 10:28
15
2.3
36
33.5
65.4
5/16/01 10:26
16
2.3
6
33.3
65.3
5/16101 10:23
17
2.0
5
32.9
65.2
5/16/01 10:20
18
1.4
58
33.7
65.5
5/16/01 10:47
19
1.1
9
33.4
66.4
5/16/01 10:43
20
2.4
6
32.5
65.7
5/16/01 10:40
21
2.4
8
32.8
65.8
5/16/01 10:36
22
2.3
7
33.2
65.8
5116/01 10:33
23
1.7
117
33.5
66.0
5/16/019:51
Dock
21
33.8
67.2
5/16/01 11:001
Dock
-----1
16 1
33.5 1
68.9
STATION MINIMUM
1.1
32.5
63.6
STATION MAXIMUM
2.6
35.4
66.4
STATION AVERAGE
1.8
33.7
65.6
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.

MR
r
MR
A.
mw
p"
w
0"
r
mm
wo
TABLE 14. FIELD DATA SUMMARY
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5/16/01
MONITORING CYCLE
1200
TIDAL PERIOD
3/8 -1/2 FLOOD TIDE
WIND DIRECTION (from)
NORTH
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROM[ETER
READING'
CONDUCTIVITY
(MS/CM)
TEMPERATURE
(OF)
5/16/01 11:58
1
1.6
242
34.3
68.2
5/16101 11:59
2
1.6
239
34.1
68.1
5/16101 12:01
3
1.5
184
34.1
68.3
5/16/01 12:02
4
1.4
370
34.7
68.4
5/16/01 12:03
5
1.4
118
33.8
68.6
5/16/01 12:05
6
1.2
77
33.7
69.3
5/16/01 12:06
7
1.1
74
33.7
69.7
5/16/01 12:06
8
1.3
88
33.7
69.7
5/16/01 12:08
9
1.2
158
33.9
69.8
5/16/01 12:10
10
1.9
78
33.4
67.5
5/16/01 12:12
11
2.5
196
32.9
67.8
5/16/01 12:15
12
2.0
19
32.9
67.9
5/16/01 12:17
13
1.4
37
32.9
69.0
5/16/01 12:28
14
2.3
78
33.6
68.2
5/16/01 12:26
15
2.5
29
33.9
67.6
5/16/01 12:24
16
2.2
43
32.9
67.6
5/16/01 12:22
17
1.9
5
32.7
67.5
5/16/01 12:19
18
1.3
11
33.0
68.5
5/16/01 12:44
19
1.1
14
33.0
69.3
5/16/01 12:41
20
2.3
4
32.3
67.9
5/16/01 12:38
21
2.4
5
32.6
67.9
5/16/01 12:35
22
2.3
5
33.0
67.8
5/16/0112:31
23
1.7
100
33.3
68.5
5/16/0111:52
Dock
-----
15
33.7
69.7
5/16/0112:69
Dock I
----- 1
16 1
33.8 1
70.4
STATION MINIMUM
1.1
32.3
67.5
STATION MAXIMUM
2.5
34.7
69.8
STATION AVERAGE
1.7
33.4
68.4
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
as

0"
mm
TABLE 15. FIELD DATA SUMMARY
an DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
mm
m"
MR
6-1
m
No
r"
No
am
oft
m,
011184
DATE
5/16/01
MONITORING CYCLE
1400
TIDAL PERIOD
3/4 - 7/8 FLOOD TIDE
WIND DIRECTION (from)
NORTH-NORTHEAST
DATE AND
TIME
MONITORING
STATION
WATER DEPTH
(ft)
FLUOROMETER
READING'
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(°F)
5/16/01 13:56
1
1.4
345
34.7
70.2
5/16/01 13:57
2
1.5
193
33.8
70.0
5/16/01 13:59
3
1.6
404
34.8
70.1
5/16/01 14:00
4
1.5
432
35.3
69.9
5/16/01 14:02
5
1.3
118
33.4
70.4
5/16/01 14:03
6
1.2
19
33.3
70.9
5/16/01 14:04
7
1.1
44
33.1
71.2
5/16/01 14:05
8
1.3
41
33.3
71.0
5/16/01 14:07
9
1.2
72
33.4
71.5
5/16/01 14:10
10
2.0
63
32.9
69.6
5/16/01 14:14
11
2.6
19
32.9
69.5
5/16/01 14:16
12
2.1
12
32.8
69.6
5/16/01 14:19
13
1.5
37
33.1
70.8
5/16/01 14:33
14
2.3
116
33.2
69.9
5/16/01 14:30
15
2.3
19
32.7
69.2
5/16/01 14:27
16
2.4
4
32.7
69.1
5/16/01 14:25
17
2.0
6
32.6
69.5
5/16/01 14:22
18
1.3
7
33.1
70.6
5/16/01 14:50
19
1.1
10
32.8
70.9
5/16/01 14:46
20
2.4
4
32.8
69.7
5/16/01 14:42
21
2.4
10
32.0
69.2
5/16/01 14:39
.22
2.3
5
32.2
69.1
5/16/01 14:35
23
1.7
115
33.5
69.4
5/16/0113:50
Dock
14
33.8
70.7
5/16/0115:04 1
Dock I
-----
16 1
33.9
70.1
STATION MINIMUM
1.1
32.0
69.1
STATION MAXIMUM
2.6
35.3
71.5
STATION AVERAGE
1.8
33.2
70.1
m"
NOTE: 1) AVERAGE READING ENTERED FOR RANGES RECORDED.
mm
p"

4"
MR
p"
no
�w
ON
I"
f"
No
mo
a"
MR
a"
am
P"
mo
TABLE 16. FIELD DATA MONITORING SUMMARY - AVERAGE VALUES 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
5/15-16/01
MONITORING CYCLE
ALL
TIDAL PERIOD
FULL
WIND DIRECTION (from)
NORTH TO EAST
DATE AND
TIME
MONITORING
CYCLE
WATER DEPTH
(ft)
CONDUCTIVITY
(MS/cm)
TEMPERATURE
(°F)
5115101
1300 (BACKGROUND)
STATION MINIMUM
1.1
32.5
67.3
STATION MAXIMUM
2.6
35.1
68.6
STATION AVERAGE
1.8
33.7
68.0
5115101
1800
STATION MINIMUM
1.2
32.5
67.5
STATION MAXIMUM
2.6
34.6
68.3
STATION AVERAGE
1.8
33.6
68.0
5115101
2200
STATION MINIMUM
1.2
32.2
66.2
STATION MAXIMUM
2.8
34.0
67.2
STATION AVERAGE
1.8
33.3
66.7
5/ 16/01
0200
STATION MINIMUM
1.3
32.0
64.6
STATION MAXIMUM
2.7
35.4
66.3
STATION AVERAGE
1.9
33.6
65.3
5/ 16/01
0600
STATION MINIMUM
1.3
32.3
63.3
STATION MAXIMUM
2.8
36.1
64.8
STATION AVERAGE
2.0
33.8
64.0
5/ 16/01
0800
STATION MINIMUM
1.2
32.5
63.5
STATION MAXIMUM
2.7
35.3
64.6
STATION AVERAGE
1.9
33.8
64.1
5116101
1000
STATION MINIMUM
1.1
32.5
63.6
STATION MAXIMUM
2.6
35.4
66.4
STATION AVERAGE
1.8
33.7
65.6
5/16/01
1200
STATION MINIMUM
1.1
32.3
67.5
STATION MAXIMUM
2.5
34.7
69.8
STATION AVERAGE
1.7
33.4
68.4
5/ 16/01
1400
STATION MINIMUM
1.1
32.0
69.1
STATION MAXIMUM
2.6
35.3
71.5
STATION AVERAGE
1.8
33.2
70.1
TIDAL CYCLE MINIMUM
1.1
32.0
63.3
TIDAL CYCLE MAXIMUM
2.8
36.1
71.5
TIDAL CYCLE AVERAGE
1.8
33.6
66.7

am
TABLE 17. DYE METERING PUMP CALIBRATION DATA 011184
No DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
w"
am
p"
am
ON
ow
M"
No
MR
on
f"
MR
DATE
TIME
VOLUME
(MI)
Time
(min)
RATE
(ml/min)
AVERAGE RATE
(ml/min)
5115101
14:00
11.5
1.028
11.187
11.5
1.0395
11.063
11.5
1.018
11.297
11.18
5115101
23:15
15.0
1.107
13.550
13.55
5/16/01
7:33
17.0
1.045
16.263
16.26
5/16/01
16:00
17
1.031
16.484
17
1.026
16.572
18
1.0765
16.721
16.59
ow

am
tam
TABLE 18. DYE CONCENTRATION DELIVERY CALCULATIONS
ow DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
mo
ow
am
DATE
DATE AND
EXCEL
FLOW
CONCENTRATION
TIME
SERIAL DATE
RATE
TO DIFFUSER
AND TIME
(m1/min)
(ppb)
5/15/2001
5/15/200114:00
37026.58333
11.18
98.14
5/15/2001
5/15/200123:15
37026.96875
13.55
118.93
5/16/2001
5/16/20017:33
37027.31458
16.26
142.72
5/16/2001
5/16/200115:54
37027.6625
16.59
145.62
m NOTES: CONCENTRATION TO DIFFUSER DETERMINED BY MASS BALANCE.
CONC = DYE FLOW RATE X DYE CONC / (DYE FLOW RATE + EFFLUENT FLOW RATE).
CONC = DYE FLOW RATE X 17,142,857.1429 / (129539060 + DYE FLOW RATE).
FLOW RATES ARE IN MILLI -METERS PER MINUTE.
CONCENTRATIONS ARE IN PARTS PER BILLION.
w"
sm
am
m
pa
rm
L-1
am
Am

am
am
TABLE 19. DYE CONCENTRATION AND FLUOROM ETER READING DATA 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
STANDARD
(PPb)
FLUOROMETER READING
(PPb)
2.00
27.6
2.00
29.4
2.00
30.2
2.00
30.8
5.00
70.1
5.00
71.5
5.00
79.6
5.00
80.4
10.00
155
10.00
166
25.00
400
25.00
421
33.33
544
33.33
558
49.99
824
49.99
851

TABLE 20. CALCULATED BASE FLUOROMETER READINGS BY MONITORING CYCLE
.. DIFFUSER DYE PERFORMANCE STUDY! '
CAPE HATTERAS WATER TREATMENT PLANT / } k I�
DATE
MONITORING
DATE AND
CALCULATED
CALCULATED
CYCLE
TIME
DYE DELIVERY
BASE FLUOROMETER
CONCENTRATIONS
READINGS
(PPb)
5/15/2001
14:00
5/15/2001 14:00
103.1
1,728
5/15/2001
18:00
5/15/200118:00
110.9
1,859
5/15/2001
22:00
5/15/2001 22:00
118.6
1,989
5/16/2001
2:00
5/16/20012:00
126.4
2,120
5/16/2001
6:00
5/16/20016:00
134.2
2,250
5/16/2001
8:00
5/16/20018:00
138.0
2,315
5/16/2001
10:00
5/16/200110:00
141.9
2,381
5/16/2001
12:00
5/16/200112:00
145.8
2,446
5/16/2001
14:00
5/16/2001 14:00
149.7
2,511
_ NOTES: DYE DELIVERY CONCENTRATIONS FROM EQUATION ON FIGURE 6.
CONC = 46.538 X (EXCEL SERIAL DATE) - 1,723,040.
BASE FLUOROMETER READINGS FROM EQUATION ON FIGURE 7.
BASE=16.826 X (DELIVERY CONCENTRATION)-7.1464.
m
m
m
m

m
TABLE 21. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
no DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
f"
m
on
fmq
REA
im
fm
am
DATE
5115101
MONITORING CYCLE
1300 (BACKGROUND)
TIDAL PERIOD
3/4 - 7/8 FLOOD TIDE
WIND DIRECTION (from)
NORTH
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
CALCULATED BASE FLUOROMETER READING
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5115101
13:40
5/15/0113:40
1
10
-----
5/15/01
13:42
5/ 15/01 13:42
2
10
-----
5/15101
13:43
5/15/0113:43
3
10
-----
5/15101
13:44
5/15/0113:44
4
20
-----
5/15/01
13:45
5/ 15/01 13:45
5
25
-----
5/15/01
13:46
5/15/0113:46
6
21
-----
5/15/01
13:47
5/15/0113:47
7
18
-----
5115101
13:47
5/15/0113:47
8
19
-----
5/15101
13:50
5/15/0113:50
9
11
-----
5/15/01
13 :51
5/ 15/01 13:51
10
10
-----
5/15101
13:52
5/15/0113:52
11
11
-----
5/15/01
13:54
5/15/0113:54
12
13
-----
5/15101
13:55
511510113:55
13
14
-----
5115101
13 :06
5/ 15/01 13:06
14
8
-----
5115/01
13:10
5/ 15/01 13 :10
15
11
-----
5/15101
13:13
5/15/0113:13
16
9
-----
5115101
13:15
5115101 13:15
17
9
-----
5/15/01
13:20
5/ 15/01 13:20
18
10
-----
5/15101
13:24
511510113:24
19
11
- -----
5/15101
13:27
5/15/0113:27
20
10
-•---
5/15101
13:29
5/15/0113:29
21
10
-----
5/15101
13:33
5/15/0113:33
22
11
-----
5/15101
13:35
5/15/0113:35
23
12
-----
"" NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
mm

TABLE 22. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
5/15/01
MONITORING CYCLE
1800
TIDAL PERIOD
1/2 - 5/8 EBB TIDE
WIND DIRECTION (from)
EAST
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
110.9
CALCULATED BASE FLUOROMETER READING
1,859
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5/15/01
17:56
5/15/0117:56
1
330
5.6
5/15/O1
18:00
5/15/0118:00
2
141
13.2
5115101
18:01
5/1510118:01
3
349
5.3
5/15/01
18:03
5/15/0118:03
4
341
5.5
5/15/O1
18:04
5/15/0118:04
5
128
14.5
5/15/O1
18:05
511510118:05
6
94
19.9
5115101
18:06
5/15/0118:06
7
20
91.3
5115101
18:07
5/15/0118:07
8
70
26.6
5115101
18:10
5/15/0118:10
9
12
157.5
5115101
18:12
5/15/0118:12
10
34
54.4
5115101
18:14
5/15/0118:14
11
145
12.8
5115101
18:17
5115/01 18:17
12
11
170.5
5/15/01
18:19
5/15/0118:19
13
11
177.0
5115101
18:31
5/15/0118:31
14
58
32.1
5/15/O1
18:29
5/15/0118:29
15
29
64.5
5115101
18:26
5/15/0118:26
16
13
141.4
5115101
18:24
5/15/0118:24
17
17
108.7
5115101
18:21
5/15/01 18:21
18
10
184.0
5/15/O1
18:50
5/15/0118:50
19
11
177.0
5115101
18:46
5/15/0118:46
20
10
180.5
5/15/01
18:43
5/15/0118:43
21
11
175.4
5/15/01
18:40
5/15/0118:40
22
11
172.1
5/15/OI
18:35
5/1510118:35
23
58
32.1
5/15/01
17:45
5/15I0117:45
Dock
-----
5/15101
19:03
5/15/0119:03
Dock
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
I
7YJ nlct Subr�s G-.-+

MR
mm
Im
Im
m"
mm
mm
MR
mm
as
Im
fim
fm
MR
am
TABLE 23. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
5115101
MONITORING CYCLE
2200
TIDAL PERIOD
1/4 - 3/8 FLOOD TIDE
WIND DIRECTION (from)
EAST
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
118.6
CALCULATED BASE FLUOROMETER READING
19989
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5115101'
22:02
511510122:02
1
593
3.4
5115101
22:11
5/ 15/01 22:11
2
494
4.0
5115101
22:13
5/15/0122:13
3
739
2.7
5115101
22:15
5/15/0122:15
4
787
2.5
5115101
22:16
5/15/0122:16
5
811
2.5
5115101
22:17
5/ 15/01 22:17
6
843
2.4
5115101
22:20
511510122:20
7
910
2.2
5115101
22:23
511510122:23
8
797
2.5
5115101
22:28
5/15/0122:28
9
24
83.1
5115101
22:27
511510122:27
10
59
33.5
5115101
22:32
5/15/0122:32
11
11
188.9
5115101
22:34
5/15/0122:34
12
7
274.4
5115101
22:35
511510122:35
13
8
258.3
5115101
22:48
5/15/0122:48
14
93
21.4
5115101
22:45
511510122:45
15
46
43.3
5115101
22:43
5/ 15101 22:43
16
111
18.0
5115101
22:41
5/15/01 22:41
17
8
250.2
5115101
22:38
511510122:38
18
23
88.2
5115101
23:03
511510123:03
19
8
256.8
5115101
23:00
511510123:00
20
8
265.2
5115101
22:56
511510122:56
21
7
268.8
5115101
22:53
511510122:53
22
8
253.4
5115101
22:50
511510122:50
23
30
65.9
5/15/01
17:45
511510121:52
Dock
----•
-----
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
Imm

No
m"
mm
MR
MR
fm
mm
p"
mm
TABLE 24. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
5/16/01
MONITORING CYCLE
0200
TIDAL PERIOD
7/8 FLOOD -1/8 EBB TIDE
WIND DIRECTION (from)
NORTH-NORTHEAST
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
126.4
CALCULATED BASE FLUOROMETER READING
27120
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5116101
2:17
5/16/012:17
1
120
17.7
5/16/01
2:21
5/16/01 2:21
2
145
14.6
5/16/01
2:22
5/16/012:22
3
150
14.2
5/16/01
2:23
5/16/012:23
4
386
5.5
5116101
2:25
5/16/012:25
5
582
3.6
5/16/01
2:26
5/16/012:26
6
409
5.2
5/16/01
2:27
5/16/012:27
7
363
5.8
5/16/01
2:28
5/16/012:28
8
421
5.0
5/16/01
2:31
5/16/01 2:31
9
37
57.1
5116101
2:33
5/16/012:33
10
83
25.5
5/16/01
2:35
5/16/012:35
11
119
17.8
5/16/01
2:37
5/16/012:37
12
214
9.9
5/16/01
2:39
5/16/012:39
13
151
14.1
5/16/01
3:31
5/16/01 3:31
14
24
88.3
5/16/01
2:50
51161012:50
15
33
63.6
5116101
2:47
5/ 16/01 2:47
16
43
49.6
5/16/01
2:45
5/16/012:45
17
49
43.6
5/16/01
2:42
5/16/012:42
18
170
12.5
5/16/01
3:46
5/16/013:46
19
153
13.9
5/16/01
3:51
5/16/01 3:51
20
7
325.1
5/16/01
3:43
51161013:43
21
5
441.6
5/16/01
3:40
5/16/013:40
22
6
374.5
5/16/01
3:35
5/16/013:35
23
8
259.8
5/16/01
Dock i
-----
-----
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
MR

OR
FM
ME
am
m"
Im
mm
OR
im
FM
mm
m
fm
mm
mo
mm
TABLE 25. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
5/16/01
MONITORING CYCLE
0600
TIDAL PERIOD
3/8 FLOOD - 5/8 EBB TIDE
WIND DIRECTION (from)
NORTH-NORTHEAST
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
134.2
CALCULATED BASE FLUOROM ETER READING
29251
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5/16/01
5:58
5/16/015:58
1
298
7.6
5/16/01
6:00
5/16/016:00
2
200
11.3
5/16/01
6:01
5116101 6:01
3
348
6.5
5116101
6:02
51161016:02
4
574
3.9
5/16/01
6:03
5/16/016:03
5
245
9.2
5/16/01
6:04
5/16/016:04
6
227
9.9
5/16/01
6:05
51161016:05
7
200
11.3
5/16/01
6:07
5/ 16/01 6:07
8
227
9.9
5/16/01
6:09
5/ 16/01 6:09
9
221
10.2
5/16/01
6:13
5/16/016:13
10
106
21.2
5/16/01
6:14
5/16/016:14
11
74
30.4
5/16/01
6:17
5/16/016:17
12
140
16.1
5/16/01
6:19
5/16/016:19
13
120
18.8
5/16/01
6:35
6/16/016:35
14
25
90.0
5/16/01
6:31
5/16/01 6:31
15
26
86.6
5/16/01
6:24
5/16/016:24
16
27
83.4
5/16/01
6:23
5/ 16/01 6:23
17
52
43.3
5/16/01
6:22
5/16/016:22
18
137
16.4
5/16/01
6:43
5/16/016:43
19
95
23.7
5/16/01
6:42
5/16/016:42
20
15
150.1
5/16/01
6:41
5/ 16/01 6:41
21
5
450.2
5/16/01
6:38
5/16/016:38
22
5
450.2
5/16/01
6:37
5/16/016:37
23
12
187.6
5/16/01
7:02
5/16/017:02
Dock
18
125.1
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
m

w"
TABLE 26. FLUOROMETER READINGS AND DISPERSION CALCULATIONS
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
011184
DATE
5/16/01
MONITORING CYCLE
0800
TIDAL PERIOD
3/4 - 7/8 EBB TIDE
WIND DIRECTION (from)
NORTH
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
138.0
CALCULATED BASE FLUOROMETER READING
21315
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5116101
7:55
5/16/017:55
1
310
7.5
5116101
7:58
5/16/017:58
2
218
10.6
5/16/01
8:00
5/ 16/01 8:00
3
272
8.5
5/16/01
8:02
5/16/018:02
4
444
5.2
5/16/01
8:03
5/16/018:03
5
409
5.7
5/16/01
8:04
5/ 16/01 8:04
6
106
21.8
5/16/01
8:05
5116101 8:05
7
119
19.5
5/16/01
8:07
5/16/018:07
8
130
17.8
5/16/01
8:09
5/ 16/01 8:09
9
142
16.3
5/16/01
8:11
5/ 16/01 8:11
10
80
28.9
5/16/01
8:13
5/16/018:13
11
78.
29.7
5116101
8:15
5/16/018:15
12
47
49.3
5/16/01
8:18
5/16/018:18
13
76
30.5
5/16/01
8:30
5/16/018:30
14
157
14.7
5116101
8:28
5/16/018:28
15
61
37.9
5/16/01
8:26
51161018:26
16
62
37.3
5116101
8:23
5/16/018:23
17
65
35.6
5/16/01
8:21
5/ 16/01 8:21
18
94
24.6
5/16/01
8:47
5/16/018:47
19
45
51.4
5/16/01
8:43
5/16/018:43
20
5
463.0
5/16/01
8:40
5/16/01 8:40
21
5
463.0
5/16/01
8:36
5/16/018:36
22
19
122.5
5/16/01
8:33
5/16/018:33
23
51
45.4
5/16/01
7:46
5/16/017:46
Dock
18
128.6
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.

ON
m"
TABLE 27. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
m, DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
mm
No
Im
mm
a"
m"
rya
mm
Rm
MR
mm
DATE
5/16/01
MONITORING CYCLE
1000
TIDAL PERIOD
1/8 -1/4 FLOOD TIDE
WIND DIRECTION (from)
NORTH
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
141.9
CALCULATED BASE FLUOROMETER READING
29381
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5/16/01
9:57
5/16/019:57
1
242
9.8
5/16/01
9:58
5/16/019:58
2
245
9.7
5116101
10:00
5/ 16/01 10:00
3
344
6.9
5/16/01
10:02
5/16/0110:02
4
443
5.4
5/16/01
10:03
5/16/0110:03
5
251
9.5
5/16/01
10:04
5/16/01 10:04
6
100
23.8
5/16/01
10:05
5/16/0110:05
7
98
24.3
5116101
10:07
5/16/0110:07
8
95
25.1
5/16/01
10:09
5/16/01 10:09
9
156
15.3
5/16/01
10:11
5/16/01 10:11
10
136
17.6
5/16/01
10:14
5/16/0110:14
11
64
37.5
5/16/01
10:15
5/16/0110:15
12
34
70.0
5116101
10:17
5/16/01 10:17
13
62
38.7
5/16/01
10:31
5/16/01 10:31
14
140
17.0
5/16/01
10:28
5/16/0110:28
15
36
67.1
5116101
10:26
5/16/0110:26
16
6
396.8
5/16/01
10:23
5/16/0110:23
17
5
476.1
5/16/01
10:20
5/16/0110:20
18
58
41.4
5116101
10:47
511610110:47
19
9
264.5
5/16/01
10:43
5/16/0110:43
20
6
432.9
5/16/01
10:40
511610110:40
21
8
317.4
5/16/01
10:36
5/16/0110:36
22
7
340.1
5/16/01
10:33
5/16/0110:33
23
117
20.4
5116101
9:51
5/16/01 9:51
Dock
21
113.4
5116101
11:00
511610111:00
Dock
16
153.6
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
MR

fm
�I
TABLE 28. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
MR DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
MR
im
m"
m"
MR
mm
W9
am
No[;;-_:
5/16/01
MONITORING CYCLE
1200
TIDAL PERIOD
3/8 -1/2 FLOOD TIDE
WIND DIRECTION (from)
NORTH
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
145.8
CALCULATED BASE FLUOROMETER READING
2,446
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5/16/01
11:58
5/16/0111:58
1
242
10.1
5/16/01
11:59
5/16/0111:59
2
239
10.2
5/16/01
12:01
5/16/01 12:01
3
184
13.3
5/16/01
12:02
5/16/0112:02
4
370
6.6
5/16/01
12:03
5/16/0112:03
5
118
20.7
5/16/01
12:05
5/ 16/01 12:05
6
77
31.8
5/16/01
12:06
5/16/01 12:06
7
74
33.1
5/16/01
12:06
511610112:06
8
88
27.8
5/16/01
12:08
5/16/0112:08
9
158
15.5
5/16/01
12:10
5/16/01 12:10
10
78
31.5
5/16/01
12:12
5/16/0112:12
11
196
12.5
5/16/01
12:15
5/ 16/01 12:15
12
19
131.5
5/16/01
12:17
5/16/0112:17
13
37
66.1
5/16/01
12:28
5/16/0112:28
14
78
31.4
5/16/01
12:26
5/16/0112:26
15
29
84.3
5/16/01
12:24
5/16/0112:24
16
43
57.6
5/16/01
12:22
5/16/0112:22
17
5
472.7
5/16/01
12:19
5/16/0112:19
18
11
233.0
5/16/01
12:44
5/16/0112:44
19
14
172.9
5/16/01
12:41
5/ 16/01 12:41
20
4
613.8
5/16/01
12:38
5/16/0112:38
21
5
543.6
5/16/01
12:35
5/16/0112:35
22
5
493.2
5/16/01
12:31
5/16/01 12:31
23
100
24.5
5/16/01
11:52
5/16/0111:52
Dock
15
159.4
5/16/01
12:59
5/16/0112:59
Dock 1
16
149.2
NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
mm

m"
mm
m"
am
MR
Iv
MR
MR
f"
mm
m,
A.
TABLE 29. FLUOROMETER READINGS AND DISPERSION CALCULATIONS 011184
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
DATE
5/16/01
MONITORING CYCLE
1400
TIDAL PERIOD
3/4 - 7/8 FLOOD TIDE
WIND DIRECTION (from)
NORTH-NORTHEAST
CALCULATED EFFLUENT DYE CONCENTRATION (ppb)
149.7
CALCULATED BASE FLUOROMETER READING
21512
DATE
TIME
DATE AND
TIME
MONITORING
STATION
FLUOROMETER
READING'
DISPERSION
(:1)
5116101
13:56 .
5/16/01 13:56
1
345
7.3
5116101
13:57
5/16/0113:57
2
193
13.0
5/16/01
13:59
5/16/0113:59
3
404
6.2
5/16/01
14:00
5/16/0114:00
4
432
5.8
5116101
14:02
5/16/0114:02
5
118
21.3
5/16/01
14:03
5/16/0114:03
6
19
132.2
5/16/01
14:04
5/16/0114:04
7
44
57.7
5/16/01
14:05
5/16/0114:05
8
41
62.0
5/16/01
14:07
5/16/01 14:07
9
72
35.1
5/16/01
14:10
5/16/0114:10
10
63
40.2
5/16/01
14:14
5/16/0114:14
11
19
135.8
5/16/01
14:16
5/16/0114:16
12
12
209.3
5/16/01
14:19
5/ 16/01 14:19
13
37
68.8
5/16/01
14:33
5/16/0114:33
14
116
21.7
5/16/01
14:30
5/16/0114:30
15
19*
132.2
5/16/01
14:27
511610114:27
16
4
627.9
5/16/01
14:25
511610114:25
17
6
456.7
5/16/01
14:22
5/16/0114:22
18
7
386.4
5/16/01
14:50
5/16/0114:50
19
10
251.2
5/16/01
14:46
5/16/0114:46
20
4
627.9
5116101
14:42
5/16/0114:42
21
10
251.2
5/16/01
14:39
5/16/0114:39
22
5
558.2
5116101
14:35
5/16/0114:35
23
115
21.9
5/16/01
13:50
5/16/0113:50
Dock
14
186.1
5/16/01
15:04
5/16/0115:04
Dock
16
157.0
m, NOTE: AVERAGE READING ENTERED FOR RANGES RECORDED.
m
p,
fm

CAPE HATTERAS, NORTH CAROLINA
•___ 9• CAPE HATTERAS
WTP '
_1Ryids /����`: ��I� � SL. t •s'sf�w"x�u'_ Y'. .
„ ;v .� V .J a• s•
cn Px He rTER,s .
F �
'F1MY x Y v L
w � a
Y li
FIGURE 1
LOCATION MAP
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

Kings Island Brooks lit,
'- STUDY AREA
r }
DYE INJECTION -
�— EFFLUENT PIPELINE--
}:: h -
- j' WATER TREATMENT PLANT
M A s 'f E H -4
Note: Diffuser header 100-ft offshore in approximately 3-ft of water.
Source: USGS 7.5-min. Topographic Map, Buxton, NC, 1983. FIGURE Z
DYE AND CONDUCTIVITY MONITORING GRIDS
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

LOCATION OF SALINITY CONDUCTIVITY MONITORING STATIONS
10, 509 AND 100 METERS FROM POINT OF DISCHARGE
1
LOCATION OF DYE MONITORING STATIONS
109 50, 100, AND 200 METERS FROM POINT OF DISCHARGE
21
aq eTer
BRENTWOOD. TENNESSEE
FIGURE 3
STATION LOCATIONS
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

1
1
1
1
.l
1
1
1
.I
1
1
12" HOPE DIRECTIONAL
BORE PIPE
. I l
8' DIFFUSER CHECK VALVES
t8"
X-0"
1 1 I 1
6 O 18',D.C. BOTH SIDES 2-XI/4- S.S. STRAP W/
(i2 TOTAL) 6'X3/4' S.S. ANCHOR BOLTS.
WASHERS do NUTS '
PLAN
12' HOPE DIFFUSER
MANIFOLD
15 r(7)
PROVIDE NEOPRENE PADS BETWEEN S.S. STRAPS AND HOPE PIPE — f
AND BETWEEN CONCRETE ANCHOR AND HOPE PIPE. EXISTING GRADE
12' HOPE DIRECTIONAL( 1
BORE PIPE r I I
/� r I1 T I /1 •. a a
HOPE END CAP
12' I 1e• p
12" 3W HOPE (TMp) A I
WITTEREO ELL
• I
30' .
' A ��� ;
EXISTING CRAOE 18. "
a
12' HOPE DIRECTIONAL
BORE PtPE
•
SI
ELEVATION 9
J.
SE A•L
14996
12 DISCHARGE HEADER DETAIL INEr�.�
i:k:-! �ivWEA
; •
»... ,
CAPE* HATTERAS WATER PROJECT
R.O. PLANT CONCENTRATE DISCHARGE
HOBBS, UPCHURCH & ASSOCIA TES, P.A. SCALE: DESIGNED: ETW
qjCON&LTWO Bps 1 /2 =1 —0 DRAWN: DCJ
KILL. DEVIL 1fU$ NORTH CAROUNA 27g48 DATE: CHECKED: ETW
2Gi09S C�OATANIf�G1�WAY NOVEMBER 1998
252-44kVD FAX [phone] SHEET: 3 OF 4
m� FIGURE 4
DIFFUSER DETAIL
quAeTer
DIFFUSER DYE PERFORMANCE STUDY
BRENTWOOD, TENNESSEE CAPE HATTERAS WATER TREATMENT PLANT
I

0.50
0.45
0.40
H 0.35
a
0.30
t�
O
w 0.25
i-
Lu 0.20
v 0.15
0.10
0.05
0.00
FIGURE 5
CURRENT VELOCITY MEASUREMENTS
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
-------•---------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------ -------♦-`-`----------------
-
----------------------------------------------------------------------------------------------------------
------------------------------------------------------ ♦,j------ * ---------------------------------------------
5/14/01 12:00 5115101 0:00 5/15101 12:00 5/16/01 0:00 5/16/01 12:00 5/17/01 0:00
TIME

i I I I a 1 I I 1 I I I I I I l I I
FIGURE 6
DYE CONCENTRATION DELIVERY CURVE
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
160
150----------------------------y = 46.538x-1,------0---------------------------------------------- -----------
7239
x = Excel Serial Value for Date and Time
Rz = 0.9338
140----------------------------------------------------------------------------------------------------------
a 130
a
..
C
0
i 120
L
C
d
V
C
v 110
100
90
80
51151019:36 511510114:24 511510119:12 5/16/010:00 5/16/014:48 5/16/019:36 5/16/0114:24 5/16/0119:12
Time

I 1 l I I 1 I I l 1 1 1 1 1 1 1 1 1
900
800
700
Im 600
c
500
m
d
0 400
0
LL' 300
mirl :
100
0
0
FIGURE 7
DYE CONCENTRATION VS FLUOROMETER READING
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT
----------------------------------------------------------------------------------------- ---------------------
y=16.826x - 7.1464
W = 0.9992
------------------------------------------------------------------------------ --------------------------------
--------------------------------------------
-------------------------------------------------------
♦-----------------------------------------------------------------
-----------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------
10 20
30
Standard Concentration (ppb)
40 50 60

17Q.1
•
150
_---�100
51
32.1
175.4
180.5
•
18 EBB TIDE
'7
Calculated Effluent Dye Concentration (ppb) m 110.9 FIGURE 8
Calculated Base Flo 10 ter Reading 1,859
in 10
Lowest Dispersion m Circle 5 1 DIFFUSER DYE PERFORMANCE STUDY
rquAeTer Average Dispersion in 10 m Circle 24.4:1 AUGUSTSCA Or2001
0 501eet
BRENTWOOD, TENNESSEE ! DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

253.4
268.8
.a
265.2
S FLOOD TIDE
caculated Effluent Dye Concentration (ppd) = 118.5 FIGURE 9
Calculated Base Fluaromater Reading — 1,969 DIFFUSER DYE PERFORMANCE STUDY
Lowest Disperson in 10 m Circle 2.2:1
Average Dispersion in 10 m Circle e 2.8:1 AUGUST 15, 2001
AquAeTer erei[ 2200
D 50 teat
BRENTWOOD, TENNESSEE o DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

259.8
rquAeTer
374.5
50
Calculated Effluent Dye Concentration (ppb, m 128.4
Calculated Base Fluorometer Reading - 20
Lowest Dispersion in 10 m Circle — 3.8:1
Average Dispersion in 10 m Circle v 9.0;1
SCALE
0 50 feet
441.6
Z
325.1
•
49.6
7/8 FLOOD TIDE -HIGH TIDE
1/8 EBB TIDE
.9
FIGURE 10
DIFFUSER DYE PERFORMANCE STUDY
AUGUST 16, 2001
0200
BRENTWOOD, TENNESSEE
DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

1 1 1 .1 1 1 1 1 1 i 1 1 1 1 I _1 i 1 I
450.2
•
50
100
50
187.E 90.0
• •
450.2
•
83.4
•
30.4
•
Z
150.1
3/8 - 5/8 EBB TIDE
Calculated Effluent Dye Concentration (ppb) a 134.2 FIGURE 11
Calculated Bass Fluarameter Reading s 2,231
DIFFUSER DYE PERFORMANCE STUDY
Lowest Dispersion In 10 m Circle o 3.9:1
Average Dispersion in 10 m Circle - 8.71 AUGUST 16, 2001
quAeTer WALL 0600
0 50 fact
BRENTWOOD. TENNESSEE DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

I I 1 ➢ I I l I 1 I l I i I I l I I 1
122.5
150
100
/ 50
1.0
b
463.1
•
463.1
•
37.3
•
29.7
•
3
28.9 49.3
20
10 5
10.6 • 2
16.3 30.5
• 5 • ©• 7 •
17.8 •••
2
19.5 1.8
N
oy�
3/4 — 7/8 EBB TIDE
51.5
Calculated Effluent Dye Concentration (ppb) a 138.0 FIGURE 12
Calculated base fluorometer Reading - 2.315 DIFFUSER DYE PERFORMANCE STUDY
Lowest Dispersion In 10 m Circle - 5.2:1
quAeTer Average Dipersion In 10 m Circle o 10.8:1 AUGUSOT800, 2001
0 50 feat
BRENTWOOD, TENNESSEE I IDIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

I l I I I I I I I I I I i I I I I I I
340.1
•
2C
150
317.4
•
396.8
•
432.9
•
L9
1 /8 - 1 /4 FLOOD TIDE
1.5
1
Calculated Effluent Dye Concentration (ppb) = 141.9 FIGURE 13
Calculated Base FlIn 10 ter Reading = 2,3t31 DIFFUSER. DYE PERFORMANCE STUDY
Lowest Dispersion [n 10 m Circle = 5.4:1
quAeTer Average Dispersion in 10 m Circle = 14.3:1 AUGUS T000 ' 2001 SCA
0 50 fed
BRENTWOOD, TENNESSEE DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

l 1 1 � � ➢ 1 1 1 i 1] 1 �l 1 �i 1 1 1
543.6
•
493.1
•
613.8
•
Z
.000 TIDE
�9
1
Calculated Effluent Dye Concentration (ppb) - 145.8 FIGURE 14
Calculated Base Ruorometer Reading - 2,446 DIFFUSER DYE PERFORMANCE STUDY
Lowest Dispersion In 10 m Circle = 6.6:1
uAAverage Di%spersion
pLE ion to 10 m Circle � 19.2:1 AUGUST 100 , 2001
qeTer
0 50 feet
BRENTWOOD, TENNESSEE DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

558.2
•
15(
• 21.7
251.2
•
_Z
627.9
•
627.9
• 3/4 - 7/8 FLOOD TIDE
11 .2
Calculated Effluent Dye Concentration (ppb) = 149.7 FIGURE 15
Calculated Base
siinr10°Rdeigs512
Lowest Dispersion mCi=8:1 DIFFUSER DYE PERFORMANCE STUDY
raquAeTer Average Di.�SpeLE ion in 10 m Ctrcle = 38.2:1 AUGUS14UU,20U1
0 50 feet
BRENTWOOD, TENNESSEE DIFFUSER DYE PERFORMANCE STUDY
CAPE HATTERAS WATER TREATMENT PLANT

n�+
APPENDIX 1
CAPE HATTERAS WATER TREATMENT PLANT INFORMATION

® Uv 0 �0�
peso
4. >.
rk C
COUNTY OF DARE
FRISCO, NORTH CAROLINA 27936
`"-' WATER DEPARTMENT 50253 WATER ASSOCIATION RD.
P.O. BOX 578
BUXTON, NC 27920
PHONE: [phone]
FAX: [phone]
0[?a] CFUI
To: FLME
r�
From: Terry Goldman, Frisco WTP Discharge Facility. ORC
F-E9 Date: November 27, 2000
Re: Process Waste Stream
The Dare County Cape Hatteras' Water Treatment Plant utilizes a combination of Reverse Osmosis and
Anion Exchange treatment processes to produce a maximum of 2 MGD drinking water.
The waste stream from the water treatment plant consists of the concentrate discharge from our RO
process and backwash/spent regenerant wastewater from periodic maintenance of the Anion Exchange
and filtration units.
While in operation the Reverse Osmosis units produce'a.continuous,:concentrate flow of 520 GPM,
which is piped directly to the dischargipoint in the�Pamlico Sound at Brigand's Bay. Wastewater from
the Anion Exchange process is blended with ; yROj.corcentrate during;he service cycles of the Anion
Exchange and filter units.
The service cycles of the anion exchange process units consist of;,
1: Filter vessel backwash with finished product water @ 780 GPM for 20 minutes
2. Filter vessel rinse with shallow well raw water @ 200 GPM for 10 minutes
3. Anion Exchange unit backwash with RO permeate water @ 150 GPM for 10 minutes
F
4. Anion Exchange spent regenerant with 10% brine solution @ 100 GPM for 30 minutes
5. Slow rinse with RO permeate water @ 70 GPM for 60 minutes
6. Fast rinse with shallow well raw water @ 200 GPM for 45 minutes
Total water used per filter vessel: 17,600 gal.
Total water used per Anion Exchange vessel 17,700 gal.
This water is piped to a 128,000 gal settling basin where the supernate is pumped off, metered and piped
to blend with the RO concentrate for discharge.
Cc:l Robert W. Oreskovich, Utilities Director
C. Randy McPhee, Assistant Utilities Director
John Contestable, Frisco Water Plant Superintendent
I"
LAND OF BEGINNINGS
PRINTED ON RECYCLED PAPER

I---- 1---- L- I_
1 1 1 1 1 1 1 1 1 1
Dare County North Carolina
Cape Hatteras Frisco RO/AE Treatment Plant
Discharge Disposal Process Flow
The Dare County Water Treatment Plant (WTP) utilizes a
combination of reverse osmosis (RO) and anion exchange (AE)
treatment processes to produce a maximum of 2.0 MGD of finished
product drinking water.
The waste stream from the WTP consists of the concentrate
discharge from our RO process and backwash fregeneration
wastewater from periodic maintenance of the AE and filtration units.
• While in operation, the RO units produce a continuous concentrate
flow of 520 gpm-. Wastewater from the AE process is blended with
this RO concentrate during the service cycles of the AE and filter
units.
• In the event of a minor chemical spill, the containment fluids will be
diluted in the waste from the AE process before disposal.

Dare County (North Carolina
Cape Hatteras Frisco RO/AE Treatment Plant
Discharge Disposal Process Flow
Chemical Storage Containment
Chemical Sump Pumps (2)
Polishing Filter vessels (3)
110
Anion Exchange vessels (2)
RO/AE
Treatment
Plant
Both Waste flows
Flow
meters
Reverse Osmosis trains (2)
O
RO Waste Discharge
1-1
0
Process Flows
OFilter vessel back -wash at 780 gpm for 20 minutes.
OFilter vessel rinse at 200 gpm for 10 minutes.
OAnion Exchange backwash at 150 for 10 minutes.
OAnion Exchange regeneration at 100 gpm for 30 minutes.
OSlow rinse at 70 gpm for 60 minutes.
® Fast rinse at 200 gpm for 45 minutes.
ORO waste discharged at 520 gpm
® Rare flow from chemical room containment
40,000 gallon waste
storage tank
Combined RO & AE treatment processes waste streams to Brigand's Bay Discharge site.
128,000 gallon Settling Basin
Basin
PUMPS
Settling Basin diluted effluent
Flow
meter

Dare County North Carolina
Cape Hatteras Frisco ROME Treatment Plant
Discharge Disposal Process Flow- Waite Water Quality
k Total water used per filter vessel backwash=17,600 gallons
Total water used per anion exchange vessel regeneration = 17,700 gals.
4. Continuous flow of RO discharge = 520 gpm
Ic
Sample
(All analyses
b
i n L "rri
'
: i o0
•- L
.r II r �i✓
.. 9r
-
C c
t t r
t
�t e
Cl 4a
P.erm�t; limit 0 3:O
r
2S O
N/A ,
._
N/A. _ N/A N/A
-�--• _:�.:...
N/A
pent
Rgenerant
:L.w 8* �'1�2
-
'I ,_7Q0 O 990
E
3, 1 00 E o 005 �Q. 1 O O.60077 ,
o. 08
B 2c kW2s 1 1 = 5 g 0
: 2_ g
90 0. 003
36." 0 _O--. •_003-
'
190 = moo: 005 ::0_.77 t 4.750
-- _ ._._...__._._
._..68..0 _..._O..__. _0-_0-0 1 - O. 0. 590'
__..:.._�... _. ...__
_ ..�.._
*
0.27
O. 33821
S ett B as in
_CEffluen^ O
om om.
RD/AE . Effl u. ;18. 01
2. 2
: 8 A 501 O. 003
'14, 740 f <0. 005 " O: 86 4 O. �65
O: 78
Metals analyzed that were below detectable limits: Arsenic, Beryllium, Cadmium
Chromium, Cyanide, Lead, Mercury, Nickel, Selenium, and Silver.

M"
r"
ow
fm
an
FM
MR
M
fm
DARE COUNTY CAPE HATTERAS WATER
Date Sample Drawn: 04/19/01 Date Analysis Completed: 04/20/01
BY Whom: Terry Goldman
Wells Running: 1,3,4
Certificate of Analvaia nr Tpct
Raw
Finish
Distributed
M.C.L.
P-Alkalinity as CaCO3, mg1I
0
0
0
N/A
Total Alkalinity CaCO3. mg/I
I36
26.4
26.4
N/A
Bicarbonate as HCO3, mg/1
166
32.2
32.2
N/A
Carbonate as CO3, mg/1
0
0
0
N/A
Hydroxide as OH, mg/l
0
0
0
N/A
Total Hardness as CaCO3, mg/I
2200
60
60
150.0*
Calcium Hardness as CaCO3, mg/I
820
20
20
N/A
Magnesium as CaCO3, mg/1
1400
40
40
NIA
Calcium as Ca, mg/l
320
8
8
60.0*
Color, C.U. (Color Units)
2
0
0
15.0`
Silica as Si%, mg/l
24
.02
.02
N/A
Conductivity as µmhos/cm
20320
823
801
N/A
Iron, Fe, mg/I
.210
0
.0
0.30`
Potassium, K, mg/l
34
1.8
1.9
N/A
Copper, Cu, ©g/l
< 70 ug/I
< 70 ug/l
< 70 ug/I
1,300 ug/I II
Manganese, Mn, mg/l
.198
.001
.001
.05 <
Phosphate as PO4i mg/l
.248
1.26
1.34
5.0*
Chloride as Cl', mg/l
6705
210
210
250.0*
Fluoride as F, mg/I
.29
1.01
1.03
4.0*
Nitrate as NO3, mg/I
0
0
0
10.0
Zinc as Zn, mg/1
.197
.31
.28
5.0`
Chlorine (freeClz), mg/l
0
.72
.58
0.2H
Lead as Pb, 4g/l
< 5 ug/l
< 5 ug/I
< 5 ug/l
15 ug/l II
Corrosiveness
.50
-1.37
-1.53
N/A
pH
7.56
7.99
7.84
6.5 - 8.5*
pHs
7.49
- 9.37
9.36
N/A
Turbidity, N.T.U.
.04
.04
.04
1.0`
Total Suspended Solids, mg/l
N/A
Total Dissolved Solids, mg/l
13410
466
458
500.0*
Sulfate as SO4i m9/1
454
12.5
12.6
250.0*
Sodium as Na, mg/l (est.)
1593
63
69.7
250.0`
Sulfide as S, mg/l
0
0
0
N/A
* Recommended State Maximum H-Mandatory State Minimum <Mandatory State Maximum
mg/I = Parts Per Million ug/I = Parts Per Billion ri - Action Level N/A Not Available - No limit
FM

7
APPENDIX 2
COPIES OF DATA SHEETS AND FIELD NOTEBOOKS

Inn
fm
37
19 17
Colo h
_---_----_MR
"IM
'-fm__-'
_
fRo In
RKYLj
IAm
.... ............
o�
_ ---_.... ......
-
o�
—`—`-- ` — --'-- -` - ' ------------

LOCATION OF SALINITY/ CONDUCTIVITY MONITORING STATIONS
10, 50, AND 100 METERS FROM POINT OF DISCHARGE
LOCATION- OF DYE MONITORING STATIONS
10, 50, 100, AND 200 METERS FROM POINT OF DISCHARGE
21
7
FIGURE 3
quAeTer STATION LOCATIONS
BRENTWOOD. TENNESSEE

Cape Hatteras 'WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
c�� I
Date
Time
Stage 1
(ft)
Stage 2
(ft)
Comments
Date Time Stage 1 Stage 2 Comments
(ft) I (ft)

Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
S-rA 2 I
Date
Time
Stage 1
(ft)
Stage 2
(ft)
Comments
��-
Date Time Stage 1 Stage 2 Comments
(ft) (ft)

Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
Z"q"rz
Wind Speed
Direction
Crew
Comments
J C� O
33 ..5 �
�u. t '�
.
. �- i 5(.%+
r`Fi-- / `' (n 6
`TS
Background
34c>
10,0
3 3 y 7
b. 3
`TS �
.5/is o�
175�
3ia-3q?
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eas-f
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aba
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mgc ��'K
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-
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a ,rN,
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a y
3 y,3
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wrc r
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1;TK
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1 y
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2
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70.�
-
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C ��77 .^^��
5&G - oC.oC
4�BAZ L�-(A6miZ74V PoR 134c) ( t4goi l.)e

Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. 4
Date
Time
Depth
-Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
eft)
(ppb)
(MS)°
�F
J 1)
130 Q)
ao II a(z
Background
r&Z
1011
33,8
68.1
40 5- a 1
I g oo
X- IS 7
,3 y .1
(0 9, a
rl) YYl
DL JW LT
a
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a3 j7" a s�
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1397
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tl RC/7,S z
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
(aG)
,5 (�l ©l
i:3 _
t7
O
�� .
? .
Q:'L ZTM C
Background
Z
j +5l 0
-
. IS of
1$0 1
1•�
o270-q-27
3y.to
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met/Ulm
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lot
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If
1)9, , �0
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0800
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l
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3 y.8
Lb4lwn•1
.
ro�G-� c A� �eD�Pa, ; �s

I
Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)(7)
�
(I;T L Z MC
Background
1 sz.
9)-15 d�
3�-�
2©,
�.mc.
�sz.
33.E
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67.1
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A
A
A A P%,
1-3 zy-2. ~ SAD r L-4 v 101 (b N-7 ;?Jr `�R wU I Iv lrQ )q WU)

Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
�
Background
�
rrTL z`Mi-
S )5-Q
18a9
1.3
loq -lqf
33•0
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L. liv T LJ
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I 1 I
Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
% F .
Wind Speed
Direction
Crew
Comments
5)15101
Q4S
44
�8 , 1
Background
-5� ��
�l
3
l 3
0
z
5 is oI
I Y()s
1.3
39- N1
33.19
0913
MA(liMC
3bc. wry T
'S 01
s
al
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1 .3
e
33, 5
6 7,
M&A IT-sz
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,
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33.9
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J baq
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loo
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
r4ZI
Wind Speed
Direction
Crew
Comments
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1 1 1 1 1 i 1 i i 1 1 i
Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Proj ect No. 011184
STATION NO. 3
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
F
5)
3q 14
Background
L�ML
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
I
9
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
(ft)
Concentration
(PPb)
(MS)
Temp
Direction
,G) iS�Oj
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
�f 131� �
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
Rhoda -mine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
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,
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TS �.
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
r4q F
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. 1-?,S
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)�
F
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. 1 +
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
i_
Wind Speed
Direction
Crew
Comments
V1/��p 1
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. I S
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
'(aQ F
Wind Speed
Direction
Crew
Comments
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. 1I
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
rc—)
Wind Speed
Direction
Crew
Comments
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. I %
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
(ft)
Concentration
(PPb)
(MS)C�
Temp
Direction
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. I
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
(°C)
Wind Speed
Direction
Crew
Comments
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. 19
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
(°C)
Jo,s
Background
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO.
Date
Time
Depth
(ft)
Rhodamine WT _
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
(OC)
Wind Speed
Direction
Crew
Comments
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. -4) j
Date
Time
Depth
Ut)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
(0C)
Wind Speed
Direction
Crew
Comments
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. Q 2
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
Concentration
Temp
Direction
(ft)
(ppb)
(MS)
(°C)
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. 0 3
Date
Time
Depth
(ft)
Rhodamine WT
Concentration
(ppb)
Conductivity
(MS)
Water
Temp
M P
Wind Speed
Direction
Crew
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Comments
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184
STATION NO. ( e-k,6 Roh X)4
Date
Time
Depth
Rhodamine WT
Conductivity
Water
Wind Speed
Crew
Comments
(ft)
Concentration
(ppb)
(MS)
Temp
"ram
Direction
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Cape Hatteras WTP Diffuser Perfomance Study
AquAeTer Project No. 011184 � ,e 0 �0S"
--
Date
Time
Stage
(ft)
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(ft)
Comments
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Step 1 Start with 1mL 2*10^8 ppb Number of Liters
am Add 999 mL DI water 1
Now have 2* 10^5
MR With 2* 101\5 ppb solution
Actual Concentrations
Add x mL to get y pp in 8 L mL ppb
MO
on
1.000125
25
ppb
1
25.00
2.0005
50
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2
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100
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20.05013
500
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1 20
1 498.75
36.162731
900
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1 36
895.97
8
8
8
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1I 8
Step 2 Add 1 mL 2* 101\5 ppb dye to 999 mL DI water 1
Now have 200 ppb dye
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Actual Concentrations
Add x mL to get y pp in 8 L mL ppb
80.80808
2
81
. 2.00
205.12832
5
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421.0526
10
421
10.00
8
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q, s
APPENDIX 3
PHOTOGRAPHS

M
M
�1
M
View looking NNE across study area
Diffuser and marker buoy.
Installing stake at monitoring station location
001184
View looking SSW across study area.
Laser rangefinder at diffuser station.
Measuring distance from baseline to shoreline
Using laser rangefinder.

View along baseline southeast to northwest.
Preparing Hydrolab Datasonde for deployment at
Canal background station.
View along radial to the north.
Checking operation of Turner Model 10 fluorometer.
Measurement of current velocities using a pygmy meter. Layout of monitoring equipment in boat.
001184

Dye injection station, dye reservoir, metering pump, Preparation of dye injection equipment.
And injection port.
Monitoring crew taking readings at a station.
Dye cloud extending northwest and
southeast from the diffuser.
Dye cloud at the diffuser and monitoring stake
with light beacon.
View from end of first canal west of
Diffuser location.
001184

Re: NC0085707/Hatteras WTP - dye study
Subject: Re: NC0085707/Hatteras WTP - dye study
Date: Wed, 19 Jan 2000 09:08:13 -0500
From: Jim Blose <[e-mail]>
To: [e-mail]
CC: Charles Weaver <[e-mail]>, Ruth Swanek <[e-mail]>
Eric,
I am responding to your inquiry as requested by Charles Weaver of the NPDES
Unit. As conveyed to me, your question pertained to the submission of the
dye study data for the Cape Hatteras WTP discharge (NC0085707). As stated
in the permit, the purpose of the study is to determine circulation
patterns, the behavior of the effluent plume and the actual extent of
dilution. The sampling locations and minimum sampling intervals are
specified in the permit.
My comments on the data are as follows:
--Data resulting from the study for each sample should include at a minimum:
station, time of sample, water depth, tracer concentration, calculated
dilution relative to initial concentration.
--Data should be recorded in a spreadsheet or data base. Excel is
preferred. All field and laboratory results should be included.
--Analysis should summarize the dispersion of the plume and evaluate
dilution levels over time at various distances from the outfall in order to
address the study purposes outlined in the permit.
--A graphic display of results would be helpful.
--A listing of the data should be provided
--An electronic copy of the data should be provided (e.g. Excel file)
--Study methodology should be described, including calibration of
instruments, the rate of dye injection, and methodology for all
calculations. Any departures from the study plan should be discussed.
Prevailing weather condition, including wind speed should be described.
Please let me know if I can be of any further assistance.
--Jim Blose
Charles Weaver wrote:
> Please call (ore mail) Eric and let him know how he should prepare the
> data from the dye study. The instructions on study procedure are in the
> text of the permit and seem fairly straightforward. However, there s
> not a lot of info on how to arrange and submit the data. The study
> hasn't been conducted yet, so if you have a wish list please let Eric
> know. Eric s number is [phone].
> I'm copying Eric on this e-mail so that he knows who to contact on this
> issue (his e-mail is eweatherly@hobbsupchurch. com).
> Thanks for your help, Jim.
> CHW
Jim Blose Modeling/TMDL Unit
Division of Water Quality, Planning Branch
NC DENR
1617 Mail Service Center
Raleigh, NC 27699-1617
[e-mail]
919-733-5083 ext 514 fax: [phone]
1 of 2 1/19/00 11:24 AM

JAMES H. BLOODWORTH
From: Jay H. Sauber <[e-mail]>
To: Hobbs Upchurch & Associates <[e-mail]>
Cc: [e-mail]; [e-mail]; [e-mail];
., [e-mail]; [e-mail]; [e-mail];
Steve [e-mail]
Subject: Re: HATTERAS DYE STUDY
Date: Monday, February 02, 19982:05 PM
> WE REQUEST YOUR ASSISTANCE IN PROVIDING TECHNICAL GUIDANCE FOR PERFORMING
>A DYE STUDY FOR THE CONCENTRATE DISCHARGE OF THE PROPOSED CAPE HATTERAS
>R.O. WATER TREATMENT PLANT.
> THANK YOU,
> HOBBS, UPCHURCH &ASSOCIATES
> KILL DEVIL HILLS BRANCH OFFICE
> ERICT. WEATHERLY, P.E.
Eric,
your request for information on the dye study for the RO facility came to
me from Jimmie Overton. Since that time I have discussed the issue with
Debra Sawyer and Alton Hodge from the Washington Regional office. It is my
understanding that the RO discharge will be about 1 to two MGD's into the
Pamlico Sound in the vicinity of Brooks Point and Kngs Point between
Frisco and Buxton. It is also my understanding that the RO effluent will
come from the treatment of Yorktown aquifer groundwater and will result in
an effluent of approximately 16ppt saltwater. The current permit condition
of performing a continuous 24 hour dye injection study is related to a
proposed outfall of approximately 1,000 feet.
The Intensive Survey Unit does have some experience in conducting dye
studies of this type but normally this information is utilized in the
construction of a wastewater assimilation model. Based on my conversations
with you and Alton Hodge it seems that the only pollutant of concern is
that of the saltwater and potential nearby SAV.
From 1981 to 1986 the Water Quality Section conducted ambient water quality
monitoring near Frisco. Results of these observations indicated that 19
samples for salinity were collected with an average of 21.1ppt Samples
ranged from 16 to 28ppt. It has been my experience that given the very
shallow nature of the recieving watersj2 tb 4 feet deep, that wind
conditions will routinely provide a vertically mixed condition and any dye
movement will be directly related to the current and wind conditions. The
dye study is fairly specific under the permit conditions of Part 3 F.
Sampling stations out to approximately 1,000 feet are noted in the plan.
However, depending on the prevailing winds and current conditions there may
not be an opportunity to achieve a stead state condition. Based on the
needs for the model you may wish to perform a few instantaneous dye drops
to futher evaluate conditions prior to a significant continuous injection
study. In either case,'you mentioned to me the possibility of discharging
-� effluent into a nearby canal. Obviously, moving to a canal discharge would
change the nature of a dye study tremendously. I do not believe that
results from a dye study analyzed through an appropriate wasteload
allocation model will have the necessary resolution to determine any
impacts from the 16ppt effluent on a receiving system with salinities
frequently in the 16 to 21 ppt range. If you are trying to obtain data on
dilution and mixing for the purpose of setting toxicity testing parameters,
I would suggest that you continue your discussions with David Mathews (our
.+ aquatic Toxicity Supervisor). In any case, if you are indeed looking at
potentially moving the discharge point into a canal system perhaps you may
Page 1

wish to revisit this permit study requirement and its related Issues with
Afton Hodge and David Goodrich.
® I will be happy to futher discuss the potential dye study specifics with
you after you determine such important factors as exact discharge
locations, and purposes for conducting the dye study.
Please Confirm to:
[e-mail],state, nc, us
Thhank You,
Jay H. Sauber
N.C. Division of Water Quality
4401 Reedy Creek Rd.
Raleigh, N.C. 27607
voice) [phone]
fax) [phone]
M9
MW
SM
MM
MM
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Page 2

1 :0
TO 19197156048 P.03iO3
State of North Carolina
Department of Environment
and Natural Resources
Division of Marine Fisheries
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Preston P. Pate, Jr., Director
MAI
NCDENR
NoRrm C + QUNA D�Or
FWRONMEW Me NIPI:aAI. RESOUR=5
MEMOTZAL!iAU1VI:
t..o
r�tJ
17
O`=ri,
TO:...... Coleen Sullins, Section Chief DWQ
ut
�mm
FROM: Sara E. Winslow, Biologist Supervisor
00
N
Z_
SUBJECT: Hatteras R.Q. Water Treatment Plant
C-0
C
w
DATE: September 4, 1998
1 was contacted by Mr. Jason Dolls, DWQ today relative to any concerns DMF may continue to
have relative to the proposed Hatteras RO. Water Treatment Plant discharge. This agency has received
and reviewed the recent Dispersion Model report and the Fish Population Assessment report.
As noted in the Dispersion Model report, the RO reject water will have a lower specific
conductance (21,700 umhos/em) than the canal water, while the chloride levels (13,300—16,900 mg/1)
will be higher. The effluent from the RO plant will have a higher speoiflc gravity (1.015, with no
temperature) than the canal water.
DMF agrees with the Fish Assessment Report that the temperature and salinity of the discharge
must be relatively constant. Large fluctuations in the temperature and/or salinity of the discharge could
result in mortality or emigration of various finfish and invertebrates from the area. This agency is
concerned with the existing high sedimentation rates and decreased flow in Canal #4 and #5.
Based on DMF sampling near Brigands Bay from 1991-1997 salinity ranged from 16.8 — 28 ppt..
For the entire period the mean salinity by month was:
May 18.8 ppt
June 20.5 ppt
July 25.1 ppt
August 24.6 ppt
September 22.9 ppt
October 26.2 ppt
If you have any questions feel free to contact me (1-800-338-7805).
wez
WE
P. O. Box 769, fAvrehend City, North Carolina 28557-0769 Telaphene 252.726.7021 FAX [phone]
An Equal Opportunity Affirmative Action employer 50°/> recyded/ 10% poet -consumer paper
TOTAL P-03