NC0026051_Correspondence_19901214

101
State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
December 14, 1990
Mr. Douglas G. Cullinane, P.E.
County Engineer
120 E. Parrish Street
Law Building, Suite 100
Durham, NC 27701
Dear Mr. Cullinane,
This is in response to your October 25, 1990, request for information about Northeast Creek and the
headwaters of Jordan Lake that was used to determine appropriate limits for the Triangle W WTP NPDES permit
(No. NC0026051). Apparently the attachments to my previous letter were inadvertently not sent. Enclosed is the
complete package of requested information to ensure you have everything. This includes:
1. Water quality data from our State ambient monitoring station (No. 0209741955) at secondary road 1100.
Several maps label the roads in conflicting manners; this monitoring site is approximately 1.5 miles
downstream of the Triangle W WTP discharge. The instream data collected by the facility as part of it's
NPDES permit requirements (upstream and downstream) can be obtained from the facility itself or from the
City of Durham.
2. A graph of upstream, downstream, and effluent TP generated from the Triangle W WTP s self -monitoring
data.
3. A file memo explaining the recommended NPDES permit limits for the Triangle W WTP.
4. Results of algal growth potential tests (AGPT) performed by the EPA at four siteson Northeast Creek.
This includes maps of the sampling sites, a letter from the EPA commenting on the tests, and the raw data
resulting from the tests.
5. USGS flow data from Northeast Creek for 1988 and 1989. This data was collected at the continuous stage
gage at SR 1100, where the ambient monitoring data was collected (Item 1). More recent data can be
obtained from USGS.
I hope this information is useful to you. If you have any questions or comments, or if I can be of any further
assistance, please feel free to contact me at [phone].
Sirtcerel ,
()
J. or Clements, Asst. Ch'
r uality Section
Attachments
Pollution Prevention Pays
P.O. Box 27687. Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

Hc'..
o ( {C
'i .V
.�.N C .......
COUNTY OF DURHAM
ENGINEERING OFFICE
November 27, 1990 411
Mr. J. Trevor Clements
Asst. Chief, Water Quality Section
Post Office Box 27687
Raleigh, North Carolina 27611
Re: Water Quality Information
Dear Mr. Clements:
I have reviewed your November 14th letter supplying some
information to my office but several pieces of information were
not supplied with this letter. I am requesting that they file
a memo explaining the recommended NPDES limits for the Triangle
Wastewater Treatment Plant and the results of the algal growth
potential test (AGPT) performed by the EPA at four sites on
Northeast Creek be supplied.
I would also like to request that any flow information
at the two USGS sampling points be supplied or information on
where I can find this data. Your print-out of the water quality
information at SR 1101 in a similar format to the sampling station
at SR 1100 would also be appreciated. If I can provide any
additional information, please feel free to contact me at your
convenience.
DGC/kn
Sincerely,
0 � U
Douglas G. Cullinane, P.E.
County Engineer
120 E. Parrish Street, Law Bldg., Suite 100, Durham, N.C. 27701 [phone]
Equal Employment/Affirmadve Action Employer

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor
William W. Cobey, Jr., Secretary
November 14, 1990
Mr. Douglas G. Cullinane, P.E.
County Engineer
120 E. Parrish Street
Law Building, Suite 100
Durham, NC 27701
Dear Mr. Cullinane,
George T. Everett, Ph.D.
Director
Enclosed please find the information you requested by letter on October 25, 1990. Included are water quality
data from our State ambient monitoring station (No. 0209741955) at Secondary Road 1100, a graph of upstream,
downstream, and effluent TP generated from the Triangle W WTP's self -monitoring data, a file memo explaining the
recommended NPDES limits for the Triangle W WTP, and results from algal growth potential test (AGPT) performed
by the EPA at four sites in Northeast Creek. The ambient station at SR 1100 is approximately 1.5 stream miles
downstream from the Triangle W WTP discharge, and there is a continuous USGS gage located there as well. More
information is probably available if you can specify a parameter(s) of interest. For example, the limits for metals were
based on the stream standards and the most recent pretreatment headworks analysis provided by the plant; this can be
sent if it will be of use.
If you have any questions or comments, or if I can be of any further assistance, please feel free to contact me
at [phone].
Since y
dI
,
vor Clements, A st. Chief
a r Quality Section
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

NORTHEAST CREEK NEAR NELSON NC
At Secondary Road 1100
Station # 0209741955
TIME
WATER
CNDUCTW
BOD FEC COLI
RESIDUE
OF
DEPTH
DO
TEMP
PH
FIELD
5 DAY MFM-FCB
TOT NFLT
DATE
DAY
MEDIUM
(FT)
MG/L
CENT
SU
MICROMHO
MG/L
/100ML
MG/L
86/01/09
900
WATER
0.33
10
1
7.1
310
3.3
10
12
86/0221
840
WATER
0.33
9.6
11
7.3
140
3.1
160
55
86/03/12
850
WATER
0.33
7.7
12
6.8
323
1.2
2100
39
86/04/16
1350
WATER
0.33
7
16
502
2.7
150
86/05/14
1220
WATER
0.33
C:&
17
6.7
487
2.4
1800
30
86/06/17
940
WATER
0.33
5.2
23
6.8
530
1.8
50
39
8610728
1145
WATER
0.33
5.4
26
7
235
8610827
1110
WATER
17
7
380
1.5
22
86/10/17
850
WATER
0.33
6.2
12
6.7
405
2
2900
16
86/11/12
1015
WATER
0.33
5.9
11
6.5
301
86/12/04
945
WATER
0.33
7.6
8
6.8
138
87/01/14
1020
WATER
0.33
9.1
6
6.8
275
87/0220
1000
WATER
0.33
10.8
2
7
135
3.3
37
87/03/11
1420
WATER
0.33
11.6
7
136
87/04/08
1330
WATER
0.33
9.9
15
6
225
87/06/02
1300
WATER
0.33
6.8
24
488
1.3
34
87/0625
930
WATER
0.33
6
22
430
87/10/01
1030
WATER
0.33
6.8
19
6.9
235
87/1026
1145
WATER
0.33
6.2
13
6.35
475
1.6
18
87/11/17
930
WATER
0.33
6.2
15
6.35
472
87/12/10
1100
WATER
0.33
8.4
12
6.25
415
88/0129
915
WATER
0.33
11.8
2
7.7
267
88/0223
1300
WATER
0.33
9.9
9
7.1
283
1
5
88/0321
1130
WATER
0.33
12
9
7
220
88/0422
920
WATER
0.33
7.8
14
6.6
196
88/0526
1410
WATER
0.33
4.5
18
6.99
487
19
48
88/06/14
910
WATER
0.33
.8
19
6.52
156
88/07/07
1050
WATER
0.33
6.3
22
6.25
463
88/08/11
1158
WATER
0.33
6
26
6.33
586
0.9
4
88/09/08
945
WATER
0.33
7
19
8.36
384
88/11/14
1045
WATER
0.33
6.5
13
5.9
427
1.1
12
88/12/12
1425
WATER
0.33
10.8
5
7.2
301
89/01/18
1315
WATER
0.33
10.4
8
7.28
266
89/02/02
950
WATER
0.33
43
13.3
6.42
354
1.3
15
89/0327
945
WATER
0.33
10.3
10
6.8
66
89/04/05
1450
WATER
0.33
8.4
17.8
7.06
212
89/0524
1305
WATER
0.33
6.2
20
7.09
382
1.7
34
89/06/15
1215
WATER
0.33
5.8
24
6.99
412
89/07/11
1330
BOTTOM
0.10
6.1
26
7.1
330
89/08/15
1310
BOTTOM
0.10
6.8
23.5
7.03
240
1.6
49
89/0926
1420
WATER
0.33
7.1
18
6.95
132
8911026
1400
WATER
0.33
8.4
13.5
6.93
315
89/1128
1350
WATER
0.33
8.2
12
6.9
248
1
5
89/12/13
1425
WATER
0.33
12
4.5
6.4
97
90/0124
1405
WATER
0.33
9.6
10
7.06
278
90/0221
1440
WATER
0.33
9.5
11
6.87
179
0.8
35
90/03/15
1205
WATER
0.33
7.7
19
7.2
386
90/0426
1130
WATER
0.33
5.9
20
7.15
361

NORTHEAST CREEK NEAR Kici cnni nun
At Secondary Road 1100
Station # 0209741955
TIME
OF
DEPTH
NH4-N
TKN
NOx
TP
PO4
DATE
DAY
MEDIUM
(FT)
MG/L
MG/L
MG/L
MG/L
MG/L
86/01/09
900
WATER
0.33
10.00
10.0
3.6
4.70
4.30
8610221
840
WATER
0.33
0.34
0.6
1.6
0.71
0.55
86/03/12
850
WATER
0.33
0.08
0.5
7.9
2.80
2.70
86/04/16
1350
WATER
0.33
0.12
1.4
12.0
4.40
3.70
86105/14
1220
WATER
0.33
0.54
5.3
14.0
6.10
5.80
86/O6/17
940
WATER
0.33
0.21
1.2
14.0
4.80
4.80
86/0827
1110
WATER
0.22
1.0
11.0
4.40
3.90
86/10/17
850
WATER
0.33
0.15
1.1
14.0
7.20
5.70
86/11/12
1015
WATER
0.33
0.11
1.0
13.0
5.10
4.60
86/12/04
945
WATER
0.33
0.80
1.2
3.1
1.20
1.10
87/01/14
1020
WATER
0.33
0.12
0.8
8.8
2.70
2.70
87/0220
1000
WATER
0.33
0.12
0.4
1.1
0.39
0.31
87/03/11
1420
WATER
0.33
0.04
0.3
3.3
0.95
0.86
87)04iU8
1330
WATER
0.33
0.04
0.5
5.2
1.70
1.50
87/U6M2
1300
WATER
0.33
0.12
0.8
14.0
5.80
5.70
87/0625
930
WATER
0.33
0.53
2.5
12.0
5.20
87/10/01
1030
WATER
0.33
0.11
0.7
7.4
2.00
1.80
87/1026
1145
WATER
0.33
0.02
0.8
17.0
3.70
3.30
87/11/17
930
WATER
0.33
0.05
0.8
14.0
1.10
0.97
87/12/10
1100
WATER
0.33
0.04
0.8
16.0
3.70
3.10
88/0129
915
WATER
0.33
0.03
0.5
4.0
0.54
0.44
88/0223
130C
^ ^l
" ^"
^ '
88/0321
1130
WATER
0.33
0.04
0.5
5.5
0.92
0.79
88/0422
920
WATER
0.33
0.06
0.5
3.7
0.75
060
88/0526
1410
WATER
0.33
1.10
2.0
12.0
0.81
0.60
88/06/14
910
WATER
0.33
0.08
0.9
16.0
0.52
0.37
88/07/07
1050
WATER
0.33
0.07
1.1
20.0
0.64
0.49
88/08/11
1158
WATER
0.33
0.08
1.7
15.0
0.91
0.82
88/09/08
945
WATER
0.33
0.07
0.8
13.0
0.27
0.17
98/11/14
1045
WATER
0.33
0.05
1.0
13.0
0.65
0.50
88/12/12
1425
WATER
0.33
0.03
0.5
10.0
0.68
0.60
89/01/18
1315
WATER
0.33
0.04
0.5
6.7
0.35
0.24
89/02/02
950
WATER
0.33
0.32
1.4
10.0
1.20
0.85
8910327
945
WATER
0.33
0.09
0.5
1.4
0.20
89/04/05
1450
WATER
0.33
0.05
0.4
4.6
0.26
0.22
89/0524
1305
WATER
0.33
0.07
0.6
6.6
0.66
89/06/15
1215
WATER
0.33
0.07
0.7
11.0
0.94
89/07/11
1330
BOTTOM
0.10
0.06
0.6
7.8
0.74
89/08/15
1310
BOTTOM
0.10
0.05
0.4
4.3
0.49
0.39
89/0926
1420
WATER
0.33
0.04
0.4
1.4
0.37
0.20
8911026
1400
WATER
0.33
0.03
0.6
7.5
0.63
0.59
89/1128
1350
WATER
0.33
0.02
0.4
4.9
0.38
0.31
89/12/13
1425
WATER
0.33
0.05
0.3
0.4
0.16
0.08
90/0124
1405
WATER
0.33
0.37
0.9
2.3
0.33
0.21
90/0221
1440
WATER
0.33
0.03
0.6
3.1
0.24
0.13
90/03/15
1205
WATER
0.33
0.02
0.7
7.9
0.52
0.35
90/0426
1130
WATER
0.33
0.10
0.7
6.4
0.52
0.36

4.5
4
3.5
3
2.5
rn
E
a
2
1.5
1
0.5
0
Dec-89 Oct-89 Aug-89 Jun-89 Apr-89 Feb-89 Dec-88 Oct-88 Au9788 Jun-88 Apr-88 Feb-88
Month
+ SR 1100 (Down) 0 Triangle WWTP Effl.
Monthly Average Monitoring Data — TIP
Northeast Creek — S9- 00^ fOr, /j

DIVISION OF ENVIRONMENTAL MANAGEMENT
February 8, 1990
MEMORANDUM
TO: WLA File
FROM: Mike Scoville Y�D�
SUBJECT: Explanation of Recommended NPDES Permit Limits for Triangle WWTP
(NPDES No. NC0026051, Durham County)
The Triangle WWTP discharges to Northeast Creek at a point where the
summer 7Q10 is estimated to be 0 cfs. Northeast Creek is a tributary to
Jordan Lake and is swampy and slow -moving upstream of the lake zone. The
characteristics of the creek and the plant's location in the lake's headwat-
ers are important factors of the recommended limits.
The limitations of oxygen consuming waste (BOD and NH3) are being
reduced to protect instream DO concentrations. A rise in the DO limit to 6
mg/1 accompanies this change because the stream is dominated by the waste -
flow at 7Q10 flow conditions. Although there are currently no problems
downstream of the discharge due to the effluent, the facility is currently
operating at effluent levels below the recommended limits. The effluent
actually improves the stream quality from a DO standpoint because it often
has a higher DO and a lower BODS concentration than the upstream water. It
is expected that any increase of BOD loading to the stream will directly
impact the downstream water quality; the more stringent limits restrict the
potential impacts. Also, even though the facility is currently meeting the
proposed limits, it is operating at only about half of it's design capacity.
When the flow is increased, it is important that BOD loading be kept to a
minimum due to the sensitivity of the lake headwaters.
The recommended phosphorus limit is 0.5 mg/l in the summer and 2.0 mg/l
in the winter. This recommendation is supported by instream and effluent
data and algal growth potential tests (AGPT) performed by the EPA on this
arm of Jordan Lake. The instream and effluent monitoring data clearly show
that the effluent TP concentration is approximately double that of the
upstream concentration most of the time, and probably constitutes a signifi-
cant amount of the downstream phosphorus. Lower TP concentrations in the
effluent will be critical in the summer months when the low flows of the
Creek coincide with optimal temperature conditions for algal growth.
Results of EPA AGPT tests indicate that the Northeast Creek arm of Jor-
dan Lake is very susceptible to eutrophic conditions. EPA suggests that a 5
to 10 range of mg dry weight of algae will not create nutrient problems,
while levels greater than 10 mg dry weight "are associated with highly pro-
ductive waters which may be subjected to nuisance bloom and fish kills" (see
attached). A range of 5 to 10 mg dry weight of algae roughly corresponds to
chlorophylla concentrations of 50 to 100 ug/1. The North Carolina stream

standard for chlorophyll, is 40 ug/l for lakes, reservoirs, and other slow -
moving waters not designated as trout waters. The maximum potential algal
growth in Northeast Creek downstream of the discharge is approximately 300
mg dry weight, about 30 times the recommended trouble level. Although this
is the maximum growth potential, a 0.5 mg/l TP limit is necessary to reduce
the potential and will be especially important in the summer low flow
months. Again, when the plant is operating at full capacity, it's effluent
will be a significant source of TP to the system.
It is important to note that the proposed limits of oxygen -consuming
wastes and TP for the Triangle WWTP is consistent with the Division's hand-
ling of other wasteload allocations in similar situations. As more informa-
tion becomes available it is becoming quite clear that peidmont reservoirs,
such as Jordan Lake and Falls Lake, are very sensitive systems that need to
be carefully managed if their resources are to be protected. Recent alloca-
tions for large, dominating discharges to the headwaters of these lakes have
been given limits similar to or more stringent than those currently recom-
mended for the Triangle WWTP. Examples of these include Durham's Farrington
Road and Northside WWTPs and the John Umstead Hospital in Butner. OWASA is
also likely to receive similar limits upon the upcoming expansion of their
facility.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
REGION IV
ENVIRONMENTAL SERVICES DIVISION
ATHENS. GEORGIA 30613
VV
Daniel Vogt
North Carolina Department of Natural fa
Resources and Community Development % 7
Division of Environmental Management
Raleigh, North Carolina 27611
Dear Mr. Vogt:
I am sending you the results of the completed North Carolina
Algal Assays (AGPT) that you requested along with chemical
analysis of the autoclaved and filtered sampler. I have xeroxed
the laboratory bench sheets.
AGPT using Selenastrum capricornutum were conducted according to
EPA procedure (EPA, 1982). Autoclaved and filtered samples were
treated separately with nitrogen and phosphorus. Nitrogen and
phosphorus are the most common growth limiting nutrients in
surface waters (Gakstatter, et Al., 1975). When one of these
nutrients is added to a water sample which is growth -limiting to
that nutrient, the resulting MSC will generally reflect the level
of added nutrient. In some cases, the bioavailable nitrogen and
phosphorus in a sample may approach their optimum ratio for the
growth of the test alga and the addition of nitrogen or
phosphorus may not clearly identify the limiting nutrient. In
these situations, the sample would be considered to be co -
limiting.
Cell counts were made with a Coulter ZB-1 electronic particle
counter equipped with a mean cell volume (MCV) computer. Algal
cells were counted on days 12-14 until the maximum standing crop
in each flask was obtained. For practical purposes, this point
is identified when the daily increase in standing crop is less
than 5 percent. Cell counts and cell volume were converted to
milligrams dry weight per liter (mg/L), according to the data
reduction equation (Miller, et al., 1978):
(Cell Counts (cells ml/L) X [MCV (cubic micrometers)] X
4.12 X 10-10 = mg dry weight S. capricornutum/L*
Maximum dry weights of the replicate flasks were averaged and are
expressed as mean maximum dry weight.

In my opinion, a potential MSC of 5 mg dry weight/L or less is a
level which will not create excessive nutrient problems. Studies
have shown that algal dry weight concentrations exceeding 10 mg/L
are associated with highly productive waters which may be
subjected to nuisance bloom and fish kills.
Chemical analysis for total phosphorus and nitrogen series were
conducted by the Laboratory Support Branch of ESD.
For some reason, the results of addition of phosphorus to some
samples produced dry weight levels considerably below what should
be expected. The addition of the chelator EDTA along with the
phosphorus spike enabled some of these phosphorus enriched
samples to grow normally. For other samples, the addition of
EDTA had no effect and the algal growth remained low. In one
station sample, EDTA was required with the nitrogen addition to
provide for normal algal growth. The reduction of algal growth
can be caused by varied phenomenon such as heavy metals', or high
hardness levels. It can only be identified by trial and error
methods, chemical analysis, etc. I only had time to repeat the
nitrogen or phosphorus addition along with EDTA.
I hope that you can use the results of these completed algal
assays.
Sincerely,
Donald A. Schultz
Water Quality Unit
Enclosure

Table 1.
Mean Maximum Standing Crop (MSC) Selenastrum capricornutum (mg/L)
Morgan Creek, North Carolina
September 12, 1989
Station
Treatment
Rep 1
Rep 2
Rev 3
Mean
Range
1-A
Control
8.64
9.72
9.47
9.28
1.09
C+N
48.30
48.60
55.90
50.90
7.60
C+P
1.55
1.49
12.51
1.43
0.30
C+P+EDTA
13.79
11.32
10.65
11.92
3.13
1-C
Control
54.56
66.35
56.40
59.10
11.79
C+N
105.76
101.10
108.70
105.20
7.60
C+P
42.0
41.94
38.42
40.79
3.58
1-B
Control
261.13
266.25
266.77
264.72
5.64
C+N
341.37
371.86
505.58**
356.62
30.49
C+P+EDTA
121.97
115.60
99.53
112.37
22.44
*C+N = control + nitrogen
C+P = control + phosphorus
** = outlier

Table 2.
Mean Maximum Standing Crop (MSC) Selenastrum capricornutum (mg/L)
Northeast Creek, North Carolina (mg/L)
September 11, 1989
Station
Treatment
Rep 1
Rep 2
Rep 3
Mean
Range
2-A
Control
361.58
293.04
315.30
323.31
68.54
C+N
354.59
282.67
282.88
306.71
71.92
C+P
56.05
55.0
59.70
57.10
4.20
2-B
Control
383.62**
106.76
102.14
104.45
4.62
C+N+EDTA
337.83
311.73
241.10
296.89
96.73
C+P+EDTA
110.19
100.10
83.302
105.15
10.09
2-C
Control
301.20
312.05
296.45
303.22
15.55
C+N
364.55
301.94
162.93**
333.25
62.61
C+P+EDTA
1.68
1.95
1.21
1.61
0.74
2-D
Control
7.33
6.54
6.64
6.84
0.79
C+N
24.17
7.03**
24.07
24.12
0.10
C+P
7.33
7.38
7.78
7.46
0.55
*C+N = control + nitrogen
C+P = control + phosphorus
** = outlier

Table 4.
Mean Maximum Standing Crop (MSC) Selenastrum capricornutum (MSC) from
Lake Jordan, North Carolina (mg/L)
September 12, 1989
Station Treatment
Rep 1
Rep 2
Rep 3
Mean
Range
1-D Control
17.96
16.05
18.68
17.56
2.63
C+N
14.34
15.72**
15.02
15.03
1.38
C+P
9.14
7.74
9.32
8.73
1.58
C+P+EDTA
41.01
38.68
44.08
41.26
5.40
2-D Control
7.33
6.54
6.64
6.84
0.79
C+N
24.17
7.03**
24.07
24.12
0.10
C+P
7.33
7.38
7.78
7.46
0.55
*C+N = control + nitrogen
C+P = control + phosphorus
** = outlier

tation _
NBY-N-N -
dxQ02-N0,-N
1-A
0.11,
0.25
-B
0:92 1: _
0.10
' 1-C
0.12
0.12
,F
IT
$ tr
4
tation
NHYN ,,
NQ2-NO3-N
x
=D
0.23
0.07
2-D
0.14
0.05
Table 5.
Morgan Creek, North Carolina
September;11, 1989
Organic
Total
SIN-N
TKN
Nitrogen
Nitrogen
0.36
0.36
0.25
0.61
1.02
1.90
0.98
2.0
0.24"
0.92
0.80
1.04
Lake Tordan, North Carolina
September
12, 1989
x
Organic�,,Total
TSIN-N
TKN
Nitroven;
itro en
0 30
0.75
0.52 -
0.82
0.19_
0.69
.0.55
0.74
North-East Creek, North Carolina
September 11, 1989
tation
NHY-N-N
N92-NO3-N
ST IN-N
TKN
2-A
0.13
0.11
0.24
1.0
2-B
0.11
0.14
0.25
0.99
2-C
0.12
0.14
0.26
1.10
2-D
0.14
0.05
0.19
0.69
Organic
Total
Nitroge
Nitrogen
0.87
1.11
0.88
1.13
0.98
1.24
0.55
I
0.74
Knapp of Reeds Creek, North Carolina
September 12, 1989
Total
Phosphorus -P
0.09
1.10
0.14
n
Total
Phosphorus -P
0.07
0.08
Total
Phosphorus -P
0.88
1.30
1.10
0.08
Organic
Total
Total
Station
NHY-N-N
N9,-NO3-N
TSIN-N
TKN
Nitrogen
Nitrogen
Phosphorus -P
3-A
0.07
0.26
0.33
0.42
0.37
0.70
0.02
3-B
0.11
3.80
3.91
1.20
1.09
5.00
0.80
3-C
0.12
0.05
0.17
0.92
0.80
0.97
0.06

DIVISION OF ENVIRONMENTAL MANAGEMENT
July 19, 1989
MEMORANDUM
TO: Jimmie Overton
Jay Sauber
FROM:
THRU: Tom Stockton
Trevor Clements��
SUBJECT: Proposed AGPT Studies
Technical Support is expecting NPDES permit renewal applications from
three major facilities before next summer, each of which discharge into
nutrient sensitive water. Two of these, OWASA discharging to Morgan Creek
and Durham Triangle WWTP into Northeast Creek, discharge indirectly to Jor-
dan Lake. The third, John Umpstead Hospital, discharges to Knap of Reeds
Creek, a tributary to Falls Lake. We would like to request that AGPT studies
be done in these areas, specifically bioavailable N and P, maximum specific
growth rate, and limiting nutrient. These data are necessary to provide
consistency with the handling of other facilities in these watersheds and
will provide valuable information for both the individual analyses and the
nutrient budgets for these nutrient sensitive basins.
Specific sampling sites requested are listed below, as well as indicated
on the attached maps:
1) Morgan Creek
a) Upstream of the discharge at the bridge at the entrance of the
OWASA WWTP.
b) 100 yards downstream of the discharge (after complete mixing of
the efluent).
c) At the mouth of Morgan Creek. This site is a sampling location
for OWASA and is marked with flagging on a tree. It is acces-
sible by boat.
d) Jordan Lake near the abandoned railroad bed. Sampling should be
done halfway between a stand of dead trees in the middle of the
lake and a tree marked with red paint on the eastern shore.
2) Northeast Creek
a) Upstream of discharge
b) Downstream of mixing zone
c) At SR 1731
d) At Highway 751

1) Knap of Reeds Creek
a) Upstream of discharge
b) Downstream of mixing zone
c) At the mouth of the creek; as far upstream as a boat can go.
Samples should be taken before the end of September. Field parameters
(temperature, DO, conductivity and pH) should be measured at the time the
AGPT samples are collected, and it would also be very helpful if the samples
were taken in a downstream progression with a flow measurement at the most
upstream site.
If you have any questions or comments, please contact me.
cc: Ken Eagleson
Trevor Clements
Tom Stockton

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