-------
-------
8-POSSUM POINT. BUOY 44
CHESTER RIVER
SCALE IN MILES
-------
-------
SPECIAL WATER QUALITY SURVEYS OF THE
POTOMAC RIVER BASIN
ANACOSTIA ESTUARY 1970
WICOMICO RIVER,
ST. CLEMENT AND BRETON BAYS 1971
OCCOQUAN BAY 1971
DATA REPORT
Number 33
Annapolis Field Office
Region III
Environmental Protection Agency
-------
-------
Annapolis Field Office
Region III
Environmental Protection Agency
Data Report
Number 33
SPECIAL WATER QUALITY
SURVEYS OF THE
POTOMAC RIVER BASIN
ANACOSTIA ESTUARY 1970
WICOMICO RIVER,
ST. CLEMENT AND BRETON BAYS 1971
OCCOQUAN BAY 1971
Staff
James ¥. Marks, Chief, Analytical Laboratory Section
Orterio Villa, Jr., Chief, Development Laboratory Section
Anna R. Favorite, Statistician
Evelyn P. McPherson, Technician
-------
-------
TABLE OF CONTENTS
Page
I INTRODUCTION 1
II STATION LOCATIONS 9
III SURVEY RESULTS 11
IV MAP appendix i
-------
-------
I INTRODUCTION
A. Purpose and Scope
The Annapolis Field Office, Environmental Protection
Agency, Region III conducted special water quality surveys as
presented in this report.
1. Anacostia Estuary, 1970 - Monthly sampling runs were
made of this area to monitor water quality. Some baseline data
may be found in "Preliminary Analyses of the Wastewater and
Assimilation Capacities of the Anacostia Tidal River System",
Technical Report No. 39. This report includes a 5-day inten-
sive, April, 1967, and a 2-day special survey on Kingman Lake,
June, 1969. Analyses made on the 1970 samples were for nutrients,
dissolved oxygen, biochemical oxygen demand, carbon, chloro-
phyll £, turbidity, total suspended solids and bacteriological
content.
2. Wicomico River, St. Clement and Breton Bays, 1971 -
A survey of these areas was made at the suggestion of our
Regional Enforcement Division due to imminent closing of pro-
ductive shellfish harvesting beds. In addition to bacterio-
logical analyses, parameters measured were nutrients, dissolved
oxygen, carbon and chlorophyll a..
3. Occoquan Bay, 1971 - In cooperation with the Occoquan-
Woodbridge Sanitary District, the Annapolis Field Office con-
-------
-------
2
ducted a survey of wastewater treatment for discharge into
Potomac estuary from the Occoquan watershed. Bay samples
were analyzed over a 3-month period for major nutrients.
B. General Remarks
These special studies of specific areas of the Potomac
River basin serve as a baseline for water quality evaluation.
C. Sampling Procedures
Samples for chemical analysis were obtained by dipping a
plastic bucket into the river water with a minimum of agitation.
The water sample was then transferred to a one quart plastic
container. Dissolved oxygen (DO) samples were obtained by
siphoning from the bucket through plastic tubing extended to
the bottom of a conventional 300 ml DO bottle. The bottle was
overfilled twice without excessive agitation and the DO fixed
immediately. Bacteriological samples were taken from surface
waters directly into a sterile 160 ml prescription bottle.
All samples were stored on ice. Analyses were started immed-
iately on return to the Annapolis Field Office.
D. Measured Parameters and Analytical Methods
1. Water temperature was determined using a mercury
thermometer inserted into the sample container immediately
upon collection.
2. Water temperature was read from a Beckman Salinometer.
3. Conductivity was read from a calibrated Beckman
Salinometer.
-------
-------
U. Salinity was determined with a calibrated Beckman
Salinoraeter.
£. Light extinction, in inches, was read with a 12"
(30 cm) white secchi disk.
6. Total Phosphorus
Reference: Menzel, D.W. and Corwin, N., 1965. The
Measurement of Total Phosphorus in Seawater Based on the
Liberation of Organically Bound Fractions by Persulfate Oxi-
dation. Limnology and Oceanography, 10: 280-282.
Murphy, J. and Riley, J.P., 1962. A Modified Single
Solution Method for the Determination of Phosphate in Natural
Waters. Analytica Chiraica Acta, 27: 31-36.
Total Phosphorus was determined after persulfate
oxidation of the sample in an autoclave at 15 psi for 30
minutes. The resultant ortho-phosphate was then determined
colorimetrically as the molybdenum-blue complex with the opti-
cal density measured at 882 mjj,.
7. Inorganic Phosphorus
Reference: Murphy, J. and Riley, J.P., 1962. A
Modified Single Solution Method for the Determination of Phos-
phate in Natural Waters. Analytica Chimica Acta, 27: 31-36.
Inorganic Phosphorus was determined by automation
of the above procedure using the Technicon "Auto Analyzer."
The molybdenum-blue complex formed was determined colorimet-
-------
-------
rically with the optical density measured at 885 up.
8. Total Kjeldahl Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 1965 and 13 ed., 1971.
Total Kjeldahl Nitrogen includes ammonia and organic
nitrogen and was determined by the standard micro-kjeldahl pro-
cedure. The sample was digested in the presence of strong acid
to convert the organic nitrogen to ammonia. The ammonia was
then distilled, collected in boric acid solution, nesslerized
and determined colorimetrically.
9. Nitrate + Nitrite
Reference: A Practical Handbook of Sea Water Analysis,
J.D.H. Strickland and T.R. Parsons, Bulletin 16?, Fisheries Re-
search Board of Canada, Ottawa, Canada, 1968.
Nitrate plus nitrite nitrogen was determined by auto-
mation of the above procedure using the Technicon "Auto Analyzer."
This procedure utilizes cadmium reduction of nitrate to nitrite
and subsequent diazotization with sulfanilamide and N-(l-naphthyl)-
ethylenediamine dihydrochloride with the optical density measured
at 5IjO mjj.. The results were reported as nitrogen.
10. Ammonia
Reference: EPA Methods for Chemical Analysis of Water
and Wastes, 1971.
-------
-------
Ammonia was determined by automated phenol-hypo-
chlorite procedure. The intensity of the indophenol blue
color, formed by the reaction of ammonia with alkaline phenol-
hypochlorite, was increased using sodium nitroprusside as an
intensifying agent. The optical density was measured at 630 m)-i
and calculated as NHo-N.
11. Dissolved Oxygen
Reference: Standard Methods for the Examination of
Water and Wastewater, 13 ed., 1971.
EPA Methods for Chemical Analysis of Water and Wastes,
1971.
Dissolved Oxygen was determined by the azide modi-
fication of the basic Winkler method with the titration done
potentiometrically with a Fisher automatic "titralyzer."
12. Biochemical Oxygen Demand
Reference: Standard Methods for the Examination of
Water and Wastewater, 13 ed., 1971.
The Biochemical Oxygen Demand was determined by the
azide modification of the basic Winkler method with the titra-
tion done potentiometrically with a Fisher automatic "titraly-
zer." The samples as received were diluted if necessary and
transferred to standard 300 ml BOD bottles in triplicate. One
initial DO and two final DO determinations were used through-
out. Incubation was started immediately at 209C and continued
-------
-------
for five days after which they were titrated.
13. Total Organic Carbon
Reference: Beckman Instruments, Bulletin Ij.059-
EPA Methods for Chemical Analysis of Water and Wastes,
1971.
Total Organic Carbon was determined with a Dow-Beckman
Carbonaceous Analyzer after the sample had been purged with
nitrogen gas for five minutes.
Ik- Total Carbon
Reference: Beckman Instruments, Bulletin i|0f>9.
Total Carbon was determined with a Dow-Beckman
Carbonaceous Analyzer using the sample as received.
15. Chlorophyll a
Reference: A Practical Handbook of Sea Water Analysis,
J.D.Hc Strickland and T.R. Parsons, Bulletin 16?, Fisheries
Research Board of Canada, Ottawa, Canada. 1968.
Chlorophyll a was determined by extraction of milli-
pore filtered samples in 90$ acetone and read spectrophoto-
metrically.
16. Turbidity
Reference: EPA Methods for Chemical Analysis of Water
and Wastes, 1971.
Turbidity was determined with a Hach photoelectric
nephelometer, calibrated in Jackson Turbidity Units.
-------
17. Coliform
Reference: Standard Methods for the Examination of
Water and Wastewater, 13 ed., 1971.
Coliform population was determined using the 5 tube-
3 dilution Multiple-Tube Fermentation Technique. Lauryl sul-
fate tryptose broth was used for the presumptive test with
incubation at 3B°-C).^°G. Brilliant green lactose bile broth
was used for the confirmatory test with incubation at 35°-0.5>*C.
The results were reported as the Most Probable Number (MPN).
18. Fecal Coliform
Reference: Standard Methods for the Examination of
Water and Wastewater, 13 ed., 1971.
Water Pollution Control Research Series, WP-20-3.
Fecal Coliform population was determined using the
5 tube-3 dilution Multiple-Tube Fermentation Technique. Lauryl
sulfate tryptose broth was used for the presumptive test with
incubation at 3^9±0.5°C. EC medium was used for the confirm-
atory test with air incubation at l|5.5e±0.£9C. The results
were reported as the Most Probable Number (MPN).
19. Nonfiltrable Residue (Suspended Solids)
Reference: EPA Methods for Chemical Analysis of
Water and Wastes, 1971.
The Nonfiltrable Residue was determined by filtering
a known volume of sample. A predried and weighed Gelman Type A
-------
-------
glass fiber filter was used. The filter and its contents
were then dried in an oven at 105°C, cooled and reweighed.
The gain in weight represents Nonfiltrable Residue.
-------
-------
II STATION LOCATIONS
Station Location
ANACOSTIA RIVER
AA 1 Off Haines Point
AA 2 South Capital Bridge
AA 3 Sousa Bridge
AA k Benning Road - M
AA 5> Benning Road - Kingman
AA 6 Route ^O Bridge
AA 7 Marina - Channel
AA 8 Northwest Branch - Route 1
AA 9 Bortheast Branch - Decatur Street
WICOMICO RIVER, ST. CLEMENT AND BRETON BAYS
19-B ¥icomico River, Headwaters
19-A Chaptico Bay
19-1 ¥icomico River, Beacon "16 ¥"
19-2 Wicomico River, Can "7 ¥"
19 Wicomico River, Bluff Point
19-3 Wicomico River, Nun "2 ¥"
20-1 Breton Bay, Headwaters, Fl "R 8"
20-2 Breton Bay, Nun "6"
20-E St. Clements Bay, Mid-channel
20-3 St. Clements Bay, Headwaters, Can "3"
20-k St. Clements Bay, Shipping Point
-------
-------
10
Station Location
OCCOQUAN BAY
1 Occoquan Water Treatment Plant
2 Lorton Creek
3 Occoquan Sewage Treatment Plant
it Belmont Sewage Treatment Plant
£ Featherstone Sewage Treatment Plant
6 Neabsco Sewage Treatment Plant
7 VEPCO
8 South Channel
9 Middle Channel
10 North Channel
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-------
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Ill SURVEY RESULTS
1971
OCCOQUAN BAY
ANNAPOLIS FIELD OFFICE
1U
Sample
Number
71080516
2653
090201
1001
2315
100101
0701
1101*149
71080517
265U
090202
1002
2316
100102
0702
1101*50
71080518
2655
090203
1003
2317
100103
0703
uol*5i
71080519
2656
0902 ok
WOk
2318
100101*
07 Ok
1101*52
71080520
2657
090205
1005
2319
100105
0705
1101*53
71080521
2658
090206
1006
2320
AFO
Received
Sample
8-05
8-26
9-02
9-09
9-23
9-30
10-07
11-01*
8-05
8-26
9-02
9-09
9-23
9-30
10-07
11-01*
8-C5
8-26
9-02
9-09
9-23
9-30
10-07
11-01*
8-05
8-26
9-02
9-09
9-23
9-30
10-07
u-ol*
8-05
8-26
9-02
9-09
9-23
9-30
10-07
ll-Ok
8-05
8-26
9-02
9-09
9-23
Water
Temp
°C
2k.kO
22.20
23-30
26.70
21.10
21.10
20.00
26.10
23-30
25.60
26.70
22.20
22.20
19.1*0
26.10
23.30
25.60
26.70
20.60
23.30
20.60
26.70
23.30
2k.kO
27.20
20.60
23.30
19. kO
26.10
23-30
23.30
26.10
20.00
23.30
21.10
25.60
21*. 1*0
21.10
26.70
20.60
Total P
POJ|
mg/1
Station
.21*1*
.136
.185
.938
.173
.138
.230
.685
.1*75
.1*06
.892
.281*
.251*
.253
Station
.655
.536
.81*2
1.056
.1(28
.1*60
.301
Station
1.390
1.280
2.281
1.121
1.035
.759
.716
Station 5
1.379
1.1*21
.91*7
1.862
1.57U
.821
.760
Station
1.001*
1.020
1.1*85
1.021
1.021*
Inorganic P
POJ;
mg/1
1 - Occoquan Water
.100
.QUO
.072
.335
.097
.061;
.062
.230
Station 2 - Lorton
.31*7
.252
.251*
.320
.205
.222
.100
.237
3 - Occoquan Sewage
.372
.508
.393
.295
.166
.263
.30k
k - Belmont Sewage
.566
1.085
.810
.805
1.990
.315
.1*63
TKN
mg/1 N
Treatment
.600
.71*0
.1*90
2.1*16
.1*68
.306
.568
1.110
Creek
1.1*67
1.008
.696
2.115
.1*73
.3k6
.265
.800
Treatment
1.333
.763
1.013
2.683
.690
.365
.329
.770
Treatment
2.085
1.195
1.592
1.21*7
1.002
.115
.890
1.060
N02+N03
mg/1
N03-N
Plant
.001
.169
.315
.001
.282
.306
.1*30
.293
.116
.181*
.kio
.001
.296
.31*6
.1*29
.318
Plant
.019
.11*2
.1*12
.001
.305
.365
.1*51*
.328
Plant
.013
.001
.069
.001
.001
.115
.001
.253
NH3
mg/1 N
.001
.001
.058
.050
.030
.016
.oil*
.078
.059
.261*
.009
.119
.01*6
.029
.093
.035
.585
.009
• 255
.029
.191
.120
.035
.322
.11*3
.009
.023
.91*7
.001
.066
TOG
mg/1
8.
5.
16.
6.
11.
7.
13.
6.
10.
6.
18.
6.
13.
13.
11*.
18.
75
21*
07
1*2
20
02
65
k2
51*
83
65
31
70
02
07
30
TC
mg/1
16
17
11*
20
11*
11*
19
19
11*
30
15
30
.1*0
.06
.78
.70
• 52
.78
.00
.52
.67
.69
.06
• 99
- Featherstone Sewage Treatment Plant
.568
.523
.935
.760
.517
.369
.532
6 - Neabsco Sewage
.1*1*3
.607
.585
.650
2 . 509
2.0149
.685
1.1*25
1.191
. 001
.913
.9iiO
Treatment
1.727
1.798
2.0i;3
1.871
1.1*03
.001
.001
.001
.001
.001
.001
.021*
.191*
Plant
.001
. 001
.077
.001
.001
.01*5
.322
.019
.009
.027
.001
.Oil*
.085
.01*9
.322
.053
.009
.027
20.
16.
12.
17.
10.
13.
16.
51*
27
65
73
07
87
39
28
13
30
21*
17
.15
.33
.1*2
.81
.71
-------
-------
15
Sample
Number
71100106
0706
1101*51*
71080522
2659
090207
1007
2321
100107
0707
1101*55
71080523
2660
090208
1008
2322
100108
0708
110156
71080521*
2661
090209
1009
2323
100109
0709
1101*57
71080525
2662
090210
1010
2321*
100110
0710
1101*58
AFO
Received
Sample
9-30
10-07
11-01*
Water Total
Temp POj,
*C mg/1
Station
22.20
20.00
6 -
.811*
.1*90
P Inorganic P
POI,
mg/1
TKN
mg/1 N
Neabsco Sewage Treatment Plant
1.110
.321
.367
.232
.877
.690
Station 7 - VEPCO
8-05
8-26
9-02
9-09
9-23
9-30
10-07
ll-0/i
8-05
8-26
9-02
9-09
9-23
9-30
10-07
11-Oli
8-05
8-26
9-02
9-09
9-23
9-30
10-07
11-01*
8-05
8-26
9-02
9-09
9-23
9-30
10-07
11-OU
32.20
29.1>0
32.20 1
3l*.l*0 1
30.60
30.60
30.00
26.70
25.60 1
25.60 1
26.10 1
23.90
22.80
20.00
26.70
25.60 1
25.60 1
26.70 1
23.90
22.80
20.60
2k. kO 1
25.60 1
2k. kO 1
26.70
23.30
21.10
21.10
.703
.852
.076
.1*21*
.756
.655
.771
.765
.2la
.883
.907
.718
.761*
.869
.790
.178
.751*
.278
.608
.618
.391*
.092
.118
.223
.976
.606
.651
.1*03
.1*23
.1*01
.1*02
.718
• Slli
.333
.326
.336
Station 8 - South
• U75
.1*17
.1413
.59/1
.570
.379
.393
• Ii5l
Station 9 - Middle
.1*81* "
.1*07
.1*11*
• 50li
.1*58
.301
.326
.1*23
Station 10 - North
.542
.393
.157
.1*65
.1*38
.1*33
.388
.288
1.091
1.770
1.81*8
1.859
.813
.1*85
.771;
.680
Channel
1.000
3.613
5.166
5.155
.668
.722
.619
.770
Channel
1.185
2.761
5.890
3.006
.618
.833
.503
. 930
Channel
1.158
2.01*3
2.11*9
2.59U
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.800
.700
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.232
.023
.51*5
.016
.001
.001
.001
.599
.W5
.623
.871*
.669
.079
.001
.001
.939
.722
.623
.920
1.000
.097
.001
.001
.937
.833
.713
.920
1.11*7
.001
.001
.001
.852
.001
.828
.667
NH3
mg/1 N
.083
.Oil*
.036
.062
.322
.019
.009
.023
.001
.Oil*
.127
.032
.322
.018
.009
.022
.001
.Oil*
.280
.031*
.322
.023
.009
.022
.015
.Oil*
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.001
.322
.Oil*
.009
.023
.016
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mg/1
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8.30
10.11*
11*. 1*2
6.99
8.20
9.21*
19.53
10.00
7.35
lli.l*l
13.59
9.55
13.37
11.07
13.59
12.90
TC
mg/1
26.08
27.08
11*. 97
19.1*7
27.88
26.31
22.29
29.35
20.52
23.09
31-38
11*. 58
25.13
-------
-------
NORTHEAST BRANCH -DECATUR STREET-AA9
NORTHWEST BRANCH-ROUTE I-AA8
BENNING ROAD- KINGMAN-AA5
AA 3-SOUSA BRIDGE
AA 2 - SOUTH CAPITAL BRIDGE
AA I - OFF HAINES POINT
ANACOSTIA ESTUARY
1970
-------
POTOMAC
WICOMICO RIVER,
r
19-3-WtCOMICO RIVER,
NUN 2W
ST. CLEMENTS BAY,
MID-CHANNEL
RIVER
WICOMICO RIVER. BRETON BAY
AND ST. CLEMENTS BAY
-------
-------
-I —OCCOQUAN WATER TREATMENT PLANT
OCCOQUAN BAY
2- LORTON CREEK
3-OCCOQUAN SEWAGE TREATMENT PLANT
BELMONT BAY
4— 6ELMONT SEWAGE1 TREATMENT PLANT
OCCOQUAN BAY
FEATHERSTONE SEWAGE
TREATMENT PLANT
6 —NEABSCO SEWAGE TREATMENT PLANT
NORTH CHANNEL—10
MIDDLE CHANNEL
6-SOUTH CHANNEL
-------
-------
WATER QUALITY SURVEY
OF THE
PATUXENT RIVER
1970
DATA REPORT
Number 3h
Annapolis Field Office
Region III
Environmental Protection Agency
-------
-------
Annapolis Field Office
Region III
Environmental Protection Agency
1970 Data Report
Number 3k
WATER QUALITY SURVEY
OF THE
PATUXENT RIVER
Staff:
James ~W. Marks, Chief, Analytical Laboratory Section
Orterio Villa, Jr., Chief, Development Laboratory Section
Anna R. Favorite, Statistician
Evelyn P. McPherson, Technician
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-------
TABLE OF CONTENTS
Page
I INTRODUCTION 1
II STATION LOCATIONS 6
III SURVEY RESULTS 8
IV MAP appendix i
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-------
I INTRODUCTION
A. Purpose and Scope
During the year of 1970 the Annapolis Field Office, Region
III, Environmental Protection Agency continued surveys of the
estuarine portion of the Patuxent River. The purpose of this
monitoring was to continue updating existing conditions and
provide data for future model application.
B. General Remarks
The estuary was sampled monthly from February through
November. One sampling run was made on the Upper and Little
Patuxent River on January 20.
C. Sampling Procedures
Samples for chemical analyses were obtained by dipping a
plastic bucket into the river water with a minimum of agitation.
The water sample was then transferred to a one-quart plastic
container. Dissolved oxygen (DO) samples were obtained by
siphoning from the bucket through plastic tubing extended to
the bottom of a conventional 300 ml DO bottle. The bottle
was overfilled two volumes without excessive agitation, and
the DO fixed immediately. Samples were stored on ice and
analyses started on return to the Annapolis Field Office.
D. Measured Parameters and Analytical Methods
1. Water temperature was determined using a mercury
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-------
thermometer inserted into the sample container immediately
upon collection.
2. Total Phosphorus
Reference: Menzel, D.W. and Corwin, N., 1965- The
Measurement of Total Phosphorus in Seawater Based on the Lib-
eration of Organically Bound Fractions by Persulfate Oxidation.
Limnology and Oceanography, 10: 280-282.
Murphy, J. and Riley, J.P., 1962. A Modified Single
Solution Method for the Determination of Phosphate in Natural
Waters. Analytica Chimica Acta, 27: 31-36.
Total Phosphorus was determined after persulfate
oxidation of the sample in an autoclave at l£ psi for 30
minutes. The resultant ortho-phosphate was then determined
colorimetrically as the molybdenum-blue complex with the op-
tical density measured at 882 up.
3. Inorganic Phosphorus
Reference: Murphy, J. and Riley, J.P., 1962. A
Modified Single Solution Method for the Determination of Phos-
phate in Natural Waters. Analytica Chimica Acta, 27: 31-36.
Inorganic Phosphorus was determined by automation
of the above procedure using the Technicon "Auto Analyzer."
The molybdenum-blue complex formed was determined colorimet-
rically with the optical density measured at 885 mpi.
-------
-------
k> Total Kjeldahl Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 196$.
Total Kjeldahl Nitrogen includes ammonia and organic
nitrogen and was determined by the standard micro-kjeldahl pro-
cedure. The sample was digested in the presence of strong acid
to convert the organic nitrogen to ammonia. The ammonia was
then distilled, collected in boric acid solution, nesslerized
and determined colorimetrically.
5. Nitrate + Nitrite
Reference: A Practical Handbook of Sea Water Anal-
ysis, J.D.H. Strickland and T.R. Parsons, Bulletin 16?, Fisheries
Research Board of Canada, Ottawa, Canada, 1968.
Nitrate plus nitrite nitrogen was determined by
automation of the above procedure using the Technicon "Auto
Analyzer." This procedure utilizes cadmium reduction of
nitrate to nitrite and subsequent diazotization with sulfan-
ilamide and N-(l-naphthyl)-ethylenediamine dihydrochloride with
the optical density measured at 5^.0 m(i. The results were
reported as nitrogen.
6. Ammonia
Reference: Southeast Water Laboratory, FWQA,
Methodology for the colorimetric determination of ammonia
by the phenol-hypochlorite reaction.
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-------
FWPCA Methods for Chemical Analysis of Water and
Wastes, November 1969.
Ammonia nitrogen was determined by automation of
the phenol-hypochlorite procedure as described in the South-
east Water Laboratory Methodology and later adopted as the
official FWPCA procedure. The intensity of the indophenol
blue color, formed by the reaction of ammonia with alkaline
phenol-hypochlorite, was increased using sodium nitroprusside
as an intensifying agent. The optical density was measured
at 630 m[A and calculated as NH3~N.
7. Dissolved Oxygen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 1965.
FWPCA Methods for Chemical Analysis of Water and
Wastes, November 1969.
Dissolved Oxygen was determined by the azide modi-
fication of the basic Winkler method with the titration done
potentiometrically with a Fisher automatic "titralyzer."
8. Biochemical Oxygen Demand
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 196£.
The Biochemical Oxygen Demand was determined by the
azide modification of the basic Winkler method with the titra-
tion done potentiometrically with a Fisher automatic "titralyze--.'
-------
-------
The samples as received were diluted if necessary and trans-
ferred to standard 300 ml BOD bottles in triplicate. One
initial DO and two final DO determinations were used through-
out. Incubation was started immediately at 20°C and continued
for five days after which they were titrated.
9. Total Organic Carbon
Reference: Beckman Instruments, Bulletin 1^059•
FWPCA Methods for Chemical Analysis of Water and
Wastes, November 1969.
Total Organic Carbon was determined with a Dow-
Beckman Carbonaceous Analyzer after the sample had been purged
with nitrogen gas for five minutes.
10. Chlorophyll a
Reference: A Practical Handbook of Sea Water Analy-
sis, J.D.H. Strickland and T.R. Parsons, Bulletin 167, Fish-
eries Research Board of Canada, Ottawa, Canada. 1968.
Chlorophyll a was determined by extraction of milli-
pore filtered samples in 90$ acetone and read spectrophoto-
metrically.
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-------
II STATION LOCATIONS
Patuxent Estuary-
Station Location
E 1 Route 50 Bridge
E 2 Queen Anne's Bridge
E 3 Bell's Junk Yard
E k Trailer Court
E 5 Wayson's Corner, Route k Bridge
E 5A Western Branch
E ^B Western Branch, Sewage Treatment Plant
E 6 Mouth of Western Branch
E 6A Middle of Jug Bay, Channel
E 7 Mouth of Lyon's Creek
E 8 Nottingham
E 9 Lower Marlboro, opposite wharf
E 10 High Power Lines
E 11 Halfway between Trueman Point and Deep Landing
E 12 500 yards east of PEPCO Canal
E 12A Mouth of PEPCO Canal
E 13 Chalk Point
E ll|. Benedict Bridge Channel
E 15 Sheridan Point, Buoy 21
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-------
Patuxent River
Station Location
-x- 1; Upper Patuxent, Benedict Bridge
-;B;- 5 Upper Patuxent, Maryland Route 1; Bridge
7 Upper Patuxent, Maryland Route 211; Bridge
•Jf-x-x- 8 Upper Patuxent, John Hanson Highway, Route 5>0 Bridge
11 Upper Patuxent, Bridge behind Bowie Racetrack
III Upper Patuxent, Baltimore-Washington Expressway Bridge
15 Upper Patuxent, Maryland Route 198 Bridge
L 2 Little Patuxent, Maryland Route k^k Bridge
L 3 Little Patuxent, Bridge upstream of Woodwardville
L k Little Patuxent, Old Forge Bridge
L 5> Little Patuxent, Maryland Route 198, Simmons Bridge
L 6 Little Patuxent, Baltimore-Washington Expressway Bridge
L 7 Little Patuxent, U.S. Route 1 Bridge, Savage
-x- Same as Chesapeake Bay input station #CB 11
-x-x- Same as Chesapeake Bay input station #CB 10
-x-x-x- Same as Chesapeake Bay input station #CB 9
(See Data Report Number 31 for further data (1969-1970) on
these three stations.)
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- U S ROUTE I «R TOE 5AVAGE
-L5-MARYLAND ROUTE 198. SIMMONS BRIDGE
.^ — L4-OLD FORGE BRIDGE
I '-PRIDGE UPSTREAM nf WOODWAR D VI LIE
-—L2- MARYLAND ROUTE 424 BRIDGE.
7-MARVL ,NP POUTE 214 BRIDGE
ANME S BRIDGE
KOu11 ' BRIDGE
EC-MOUTH OF WESTERN BRANCH
E6A-M1DDLE OFJUG BAV. CHANNEL
CREEK
EI2- 500 YARDS EAST OF PEPCO CANAL
OINT
PATUXENT RIVER SURVEY
1970
SCALE IN MILES
-------
-------