U.S. ENVIRONMENTAL PROTECTION AGENCY
WATER QUALITY"
OF THE
POTOMAC ESTUARI
DISSOLVED OXYGEN BUDGET STUDIES
1970
DATA REPORT
Number 26
MIDDLE ATLANTIC REGION-III 6th and Walnut Streets, Philadelphia, Pennsylvania 19106

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903R70121
WATER QUALITY
OF THE
POTCMAC ESTUARY
DISSOLVED OXYGEN BUDGET STUDIES
1970
DATA REPORT
Number 26
U.S. EPA Region III
tlsgional Center for Environmental
1'iibi'inaticn
J.G50 Arch Street (3PM52)
Philadelphia. PA 10103
Annapolis Field Office
Region III
Environmental Protection Agency

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Annapolis Field Office
Region III
Environmental Protection Agency
1970 Data Report
Number 26
WATER QUALITY"
OF THE
POTOMAC ESTUARY
DISSOLVED OXYGEN BUDGET STUDIES
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	 7
III SURVEY RESULTS	 9
IV MAP			appendix i

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I INTRODUCTION
A.	Purpose and Scope
Two dissolved oxygen budget studies were conducted by the
Annapolis Field Office, Region III, Environmental Protection
Agency during the weeks June 22-26 and July 20-21;. The pur-
pose of these surveys was to further define the role of phy-
toplankton in the DO budget of the upper Potomac estuary.
B.	General Remarks
Transect and embayment samples were taken on three sta-
tions, Broad Creek, Piscataway Creek and Gunston Cove. Loca-
tion designations on survey results are as follows: RSM/RCM-
right shore Maryland/right channel Maryland; LSV/LCV-left
shore Virginia/left channel Virginia; El, E2, E3-embayment
at headwaters, mid creek and mouth.
C.	Sampling Procedures
Samples were obtained using a small submersible pump at-
tached to a wire cable calibrated in feet. The pump was low-
ered to the desired depth and allowed to run for two minutes
before receiving in plastic containers. Dissolved oxygen (DO)
samples were obtained directly from the pump outlet extending
to the bottom of a conventional 300 ml DO bottle. The sample
was allowed to overflow the bottle several times. The regular
DO was fixed immediately. A DO in light bottle and a DO in
dark bottle were placed in stream water for a four-hour in-

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2
cubation period, and fixed upon removal from river. Samples
were stored on ice and analyses started upon return to the
laboratory. Determinations of free, dissolved CO2 were car-
ried out in the field by 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.	Light extinction, in inches, was read with a 12"
(30 cm) white secchi disk.
3.	The pH measurements were made with a field pH meter.
Ij. Total Phosphorus
Reference: Menzel, D.W. and Corwin, N., 196£. The
Measurement of Total Phosphorus in Seawater Based on the Lib-
eration of Organically Bound Fractions by Persulfate Oxida-
tion. Limonology 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 15 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 my..

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3
5.	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 my..
6.	Total Kjeldahl Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 1965.
Total Kjeldahl Nitrogen includes ammonia and organ-
ic nitrogen and was determined by the standard micro-kjeldahl
procedure. 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, nessler-
ized and determined colorimetrically.
7.	Nitrate + Nitrite
Reference: A Practical Handbook of Sea Water Anal-
ysis, J.D.H. Strickland and T.R. Parsons, Bulletin 167, Fish-
eries 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

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u
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.
8.	Ammonia
Reference: Southeast Water Laboratory, FWQA,
Methodology for the colorimetric determination of ammonia
by the phenol-hypochlorite reaction.
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 mjj. and calculated as NH^-N.
9.	Total Organic Carbon
Reference: Beckman Instruments, Bulletin 1|05>9.
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

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5
with nitrogen gas for five minutes.
10.	Chlorophyll a
Reference: A Practical Handbook of Sea Water Anal-
ysis, 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 mil-
lipore filtered samples in 90$ acetone and read spectrophoto-
metry ally.
11.	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."
12.	Biochemical Oxygen Demand
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 1965.
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

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6
initial DO and two final DO determinations were used through-
out. Incubation was started immediately at 20 8C and continued
for five days after which they were titrated.
13. Free Carbon Dioxide
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 1965, pp. 77-85.
Free carbon dioxide was determined in the field by
a titrimetric procedure. Carbon dioxide reacts with sodium
carbonate to form sodium bicarbonate. Reaction completion is
indicated by development of a pink color characteristic of
phenolphthalein indicator.

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II STATION LOCATIONS
Station	Location	
2	llith Street Bridge
3	Haines Point
k	Bellevue
5	Woodrow Wilson Bridge
6	El	Broad Creek
E2
E3
RSM
RCM
M
LCV
LSV
7 El	Piscataway Creek
E2
E3
RSM
RCM
M
LCV
LSV

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8
Station	Location			
8	Dogue Creek
8A El	Guns ton Cove
E2
E3
RSM
RCM
M
LCV
LSV
9	Hallowing Point
10	Indian Head
10A	Occoquan Bay
11	Possum Point
12	Sandy Point
13	Smith Point
Ik	Maryland Point
l£	Nanjemoy Creek
16	Route 301 Bridge

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Ill SURVEY RESULTS
1970
POTOMAC ESTUARY DISSOLVED OXYGEN BUDGET SURVEY
ANNAPOLIS FIELD OFFICE
Sample
Number
Date
Sample
Taken
Time
Sample
Taken
Sample
Loca-
tion
Sajnple
Depth
Feet
Secchi
Disk
Inches
Field
pH
Water
Temp
°C
Total
P0J.
mg/1
P Inorganic
P POlj
mg/1
NO2+NO3
TKN mg/1
mg/1 N NO3-N
NH3
mg/1 N
TOC
mg/1
Chloro-
phyll a
M-g/1
BOD
mg/1
DO
mg/1
DO
Light
mg/1
K)
Dark
mg/1
Incu-
bation CQ
time-out Ufj








Station 2 - ll*th Street Bridge









70062301
6-23
0308
MC
Surface

8.51
25
• 591*
.109
.1*75
.200
8.31*
139.5

7.91*



1.0
02


MC
10

7.95
21*.5
.609
• 125
.500
.200
9.12
151.5

7.73



3.8
21*01
6-21*
0305
HC
Surface

7.51

.1*81*
.128
.711
.110

81*. 8

7.71*



5.1
02


MC
10

7.50

• 572
.122
.716
.11*0

90.0

7.86



It.l
072201
7-22
0928
MC
Surface
9

25.5
.736
.271
.713 .1*69
.337
7.39
138.8
1*. 59
6.11*
11.29
5.92
1330

02

0930
MC
is


25
.509
.295
.037 .1*86
.1*30
6.38
11*6.3
5.06
6.15
10.71
5.69
1330










Station 3 -
Haines Point









70062303
6-23
0255
MC
Surface

8.30
25.5
.182
.115
.1*65
.210
8.93
120.0

8.11



l*.lt
ol*


MC
10

7.90
25
.1*18
.118
.1*80
.225
6.81*
121*.5

8.02



6.6
21*03
6-21*
0255
MC
Surface

7.35

.1*93
.125
.712
.150

90.0

8.03



5.1*
01+


MC
10

7.20

.696
.11*6
.72 5
.160

90.0

7.52



5.0
072203
7-22
091*5
MC
Surface
9

26
.51*3
.256
. 81*0 .602
.061*
5.29
93.8
1*.68
5.55
9.1*7
It.ltO
11*00

01;


MC
15


26
1.075
-1*52
.611
.067
7.30
99.0
7.39
5.28
8.78
It. 99
11*00










Station 1*
- Bellevue









70062305
6-23
02^14
MC
Surface

7.65
26
1.290
.512
.555
.500
7.39
101.3

6.62



8.1*
06


MC
20

7.60
25.5
1.51*8
• 530
.590
.525
13.96
123.0

6.23



7.1
0621*05
6-21*
02 bo
MC
Surface

7.50
26
1.1*86
.1*61*
.1*75
.600

103.5

7.98



5.1*
06


MC
20

7.50
26
1.31*3
.360
.1*87
.290

129-0

7.87



5.2
072205
7-22
0955
MC
Surface
9

25.5
1.302
.805
.777
.062
5.81*
1*6.5
6.72
1*. 35
8.06
3.68
151*5

06


MC
20


25.5
1.528
1.120
1.856 .780
.625
6.71*
39.8
7.90
l*.oo
6.87
3.29
15U5









Station 5 - Woodrow Wilson Bridge









70062307
6-23
0238
MC
Surface

7.20
26.5
1. 7$1*
1.055
.620
.620
6.81*
116.3

6.27



9.2
08


MC
25

7.50
25.5
3.11*0
1.610
.600
.973
7.81*
108.8

5.55



12.0
21*07
6-21*
0225
MC
Surface

7.30
26.5
1.508
• 550
.502
.610

106.5

6.69



7.2
08


MC
25

7.1*0
26
1.761
.601*
• 503
.620

120.0

6.20



8.1*
072207
7-22
1018
MC
Surface
10

25-5
1.358
-955
.796
.888
6.03
35.3
5.28
3.31
6.76
3-15
151*5

08


MC
25


26
1.528
.965
2.191 .787
1.058
6.97
1*6.5
6.38
3-61
6.10
2.96
151*5










Station 6 -
Broad Creek









70062201
6-22
1350
El
2
10
8.20
27





96.0


10.97
9.1t9

7.0
02

1357
E2
2
11
8.30
26.5





lll*.0

10.1*3



8.2
03

1U05
E3
2
11
7.1*0
27





76.5

1* • 69
5.U0
It-1*7

13.2
01*

11*08
RSM
2
10
7.1*0
26





52.5

l*.8l



12.0
05

lias
RCM
2
13
7.50
26.5





1*8.8

I4.81
5.36
-1+-3l+

13.8
06

11*12
RCM
10

7.50
26





61.5

1*.52



13.2
07

11*35
M
2
12
7.60






1*1.3

1*.5B
5-14-7
1*.17

10.8
08

11*30
M
15

7.50






63.8

It. 25



13.0
09

11*25
M
30

7.50
26





95.3

l*.l6
It-89
3.1*0

16.2
10

lUWi
LCV
2
11
7-50
26.5





52.5

1*. 10



12.1*
11

lhho
LCV
10

7.1*0
26





61*.5

U. 31



12.0
12

il*5o
LSV
2
10
7.70
27





101*. 3


6.57
5.52

13.2


-------
Date
Sample Sample
Wumber Taken
lime
Sample
Taken
Sample
Loca-
tion
Sample
Depth
Feet
Secchi
Disk
Inches
Field
PH
Water
Temp
SC
Total P
PO;
mg.

Inorganic
P P0U
mg/1
n02+N03
TKN mg/1
mg/1 H HO^-H
Station 6 - Broad Creek -Continued
.2309
6-23

El
2

8.20
25
1.121
.310
1.991*
.1*80
10
0206
E2
2


26
1.121
.51*3

.51*0
11

0159
E3
2

7.60
26
1.637
.960
2.103
.1*50
12

015U
RSM
2


26
1.750
.935

.500
13

oiaa
RCM
2

7.50
26
1.559
.955
2.568
.510
llj


RCM
10


26
1.626
.950

.525
15

0132
M
2

7.50
26
1.511*
.995
2.1*71
.530
16


M
15


26
1.772
.970

.535
17


MC
30

7.1*0
25.5
1.907
.980
2.31*9
.530
18

0125
LCV
2


25.5
2.209
.81*5

.1*85
19


LCV
10


25-5
2.019
.960

.I480
20

0115
LSV
2

7.52
25.5
1.963
1.125
2.91*9
.1*85
55

1322
El
2
12
7.70
27.5




56

1330
E2
2
12

27




57

1337
E3
2
11
8.10
26.5




58

13U1
RSM
2
13

26.5




59

13U5
RCM
2
16
8.00
27.5




60

13U2
RCM
10


26.5




61

1100
MC
2
12
7.50
26.5




62

1355
MC
15


27




63

135U
MC
30

7.50
26.5




6h

iJ*o5
LCV
2
11

27




65

1U02
LCV
10


27.5




66

1U10
LSV
2
11
. 7.50
27.5



.386
2 lj.09
6-2I1
0210
El
2

7.1*5
25
1.35U
.1*75
1.961
10

0205
E2
2


25
1.596
.780

.1*35
11

0202
E3
2

7.13

1.57a
.895
2.168
.1*51*
12

0155
RSM
2


25.5
1.596
.880

.1*1*3
13

oiii5
RCM
2

7.15
26
1.51*1
.905
1.839
.1*50
lij


RCM
10


25.5
1.508
.920

.1*53
15

Olho
MC
2

7.25
26
1.673
.920
1.991*
.1*1*3
16


MC
15


26
.96 9
.910

.1*1*1
17


MC
30

7.20
26
1.376
.915
2.671
.1*38
18

0130
LCV
2


26.5
1.1*75
.9U0

.1*60
19


LCV
10


26
1.593
.935

.1*61*
20

0125
LSV
2

7.15
26
1.783
1.220
2.081*
.1*28
h9

13U6
El
2
15
8.20

1.111
.527
2.1*32
.1*23
50

1350
E2
2
12


1.256
.800

.1*57
51

1357
E3
2
13
7.1*0

1.189
.900
2.168
.1*55
52

11*01
RSM
2
16


1.256
.870

.1*39
53

11*12
RCM
2
13
7.20

1.1*33
.925
2.290
.1*51*
514


RCM
10
13


2.133
. 91*0

.1*51*
55

11*18
MC
2
13
7.30

1.300
.915
2.322
.1*1*1


Chloro-


DO
DO
Incu-

NH3
mg/I N
TOC
phyll a
BOD
DO
Light
Dark
bation
C02
itik/1
ws/i
mg/1
m«/l
nw/1
ma/1
tine-out
as/1
.001
12.32
202.5
8.66
9.70



5.2
.500
7.80
171.0

11.16



8.a
.81*1*
9.67
107.3
8.19
5.71



1.017
8.1*0
96.0

a.67




1.067
6.57
95.3
7.08
1*.60



10.0
1.120
7.12
99.0

U.58




1.067
7.66
60.8
7.18
14.1*9



10.6
1.120
6.81*
82.5

a.38




1.200
6.57
75.8
7.71
1*.10



11.0
1.101
7.30
96.0

1*. 21*




1.180
5.88
252.0

U. 20




1.260
6.71*
98.3
7.58
5.01



9.1


170.3

12.29
11*. 06
11.39
1715
27.8


120.0

11.63






108.8

5.86
7.03
a.70
1915
12.0


67.5

5.1*1*






90.0

5.58
8.82
6.03
1915
8.a


71.3

3.75



ia.0


77.3

5.21*
a. 96
3.78
1915


69.8

1*. 09






81*. 0

2.96
3.66
2.aa
1915
12.6


75.8

1*. 29






1*9-5

5.20






112.5

7.02
6.69
5.02
1915
ia.o
.500
6.28
131.3
9.1*3
9.33



3.6
.693

86.3

8.15




.863
1*.75
78.8
5.61
a.69



9.7
.91*8

82.5

a.1*1*




1.052
3.23
61.5
3.86
5.33



10.0
1.085

71.3

a.2a



9.a
1-059
2*. 01*
71.3
6.01
5.25



1.007

69.0

a. 18




1.111
1*.10
69.8
6.1*7
3.89



10.0
.971*

75.0

a.12




1.033

86.3

a.3a



9.8
1.190
3.66
75.0
6.83
a.69



.701
8.88
90.0

8.a5
10.86
7.80
I7a5
6.0
.885

86.3

7.91



11.a
1.135
6.59
67.5

6.a3
6.5a
a. 35
i7a5
1.216

62.3

5.12




1.287
6.59
72.8

a.ia
a.95
3.66
17 a5
9.8
1.311*

75.0

a.25



8.2
1.217
5-71*
57.8

3.90
5.oa
a.1*1
i7a5

-------

Date
Time
Sample
Sample
Secchi

Water
Total P
Inorganic

"Tr52^03


Chloro-


DO
DO
Incu-

Sample
Sample
Sample
Loca-
Depth
Disk
Field
Temp
P0J*
P POJ^
TKN
mg/1
NH3
TOC
phyll a
BOD
DO
Light
Dark
bation
CO2
Number
Taken
Taken
tion
Feet
Inches
PH
°C
mg/1
mg/1
mg/1 N
N0-)-N
mg/1 N
mg/1
Wl/1
mg/1
mg/1
mg/1
mg/1
tin®-out Bft/1








Station 6 - Broad
Creek -
-Continued









700621*56
6-21*
11*18
MC
is



1.256
.91*5

.l<53
1.310

81.0

3.1*1




SI


MC
30

7.20

1.767
1.005
2.129
.1*1*1
1.310
7.23
5U.8

3.70
3.53

17U5
10.2
58

11*25
LCV
2
13


1.500
.970

.1*1*1
1.237

71.3

1*.21




59


LCV
10



1.833
.990

.1*50
1.322

75.0

6.30




60

1U32
LSV
2
12
7.1*0

1.1*1*)*
1.065
2.716
.1*36
1.160
6.1*2
91.5

5.68
6.19
U.27
171*5
9.8
072209
7-22
1035
MC
Surface
12

26
1.215
. 9U5
1.766
.826
1.115
5.1*7
51.0
7-78
3.72
7.1*1*
3-52
15U5

10


MC
15


25.5
1.189
.955
1.979
.833
1.058
5.1*7
33.8
7.53
3.86
7.27
3.31
15U5









Station 7 - Piscataway Creek









70062213
6-22
1213
El
2
9
8.90
26






168,8

11.1*8
12.20
10.09

.6
lit

1220
E2
2
10
8.00
26.5






106.5

6.99



6.1*
15

1230
E3
2
13
7.70
26.5






56.3

5.29
8.00
6.23

9.0
16

1236
RSM
2
12
7.65
26.5






60.0

6.1*7



8.0
17

1250
RCM
2
12
7.50
26.5






60.0

U.91
5-57
1+.1*3

ll*.U
18

12l*5
RCM
10

7.50
26






52.5

U.02



12.0
19

121*2
RCM
20

7.50
26






55.5

U.12



12.0
20

1317
MC
2
lk
7-50
27






33.8

a. 57
5.15
3.93
1715
9.0
21

1310
MC
10

7.1*0
26






59.3

3.99



11.8
22

1305
MC
20

7.1*0
26.5






1*5.0

3.71*



11.0
23

1300
MC
30

7.1*0
26






52.5

3.96
1*. 89
3.61
1715
11.0
2h

1255
MC
1*0

7.1*0
26






51.8

3.87
i*.bi*
3-52

13.6
25

1327
LCV
2
lk
7 - UO
26.5






51.0





11.3
26

1325
LCV
10

7-50
26.5






1*5.0

3.1*0



13-6
27

1323
LCV
20

7.1*0
26






36.8

1*.02



ll*.8
28

1333
LSV
2
13
7-50
26.5






1*8.8

3.87
6.77
2.88
1715
13.6
2321
6-23
0100
El
2

7.75
25-5
1.929
.710
1*.1*81*
.51*5
.600
9.85
125.3
8.81
8.1*2



6.1*
22

125U
E2
2


26
1.682
.850

.630
1.11*7
6.81*
90.8

5.00




23

121*8
E3
2

7.55
26
1.61*9
.880
2.729
.635
1.107
7.52
89.3
7.12
1*.79



9.3
21*

121*2
RSM
2


26
1.682
• 593

.635
.31*0
10.26
221*.0

12.61




25

1232
RCM
2

7.51
26
1.368
.865
2.587
.700
1.120
5.10
97.5
7.65
U.99



11.0
26


RCM
10


26
1.1*02
.870

.720
1.133
8.03
90.0






27


RCM
20


25.5
1.323
.885

.700
1.093
7.66
113.3

5.01*




28

1215
MC
2

7.50
26
1.290
.870
2.671
.790
1.233
5.1*7
89.3
8.08
5.1*6



10.2
29


MC
10


26
1.1*36
.81*5

.820
1.21*0
9.13
95-3

5.03




30


MC
20


25.5
1.323
.81*5

.805
1.227
5.1*1
97.5

5.12




31


MC
30

7.50

1.850
.875
2.61*5
.810
1.267

98.3
7.1*3
U.91



10. k
32


MC
1*0


25.5
1.1*02
.865

.785
1.21*0
6.1*2
96.0

1*. 89




33


MC
50

7.1t5
25.5
1.3ii6
.885
2.110
.790
1.267
16.87
93.0
7.23
1*.18



10.2
31*

1207
LCV
2


26
1.290
.850

.750
1.200
6.59
101.3

5.95




35


LCV
10


26
1.121
.785

.850
1.253
6.25
101.3

5.58




36


LCV
20


26
1.065
.855

.760
1.213
21.1*8
76.5







-------

Date
Time
Sample
Sample
Secchi

Water
Total P
Inorganic

NO2+NO2


Chloro-


DO
DO
Incu-

Sample
Sample
Sample
Loca-
Depth
Disk
Field
Temp
PO^
P POi,
TKN
mg/1
NH3
mg/I N
TOC
phyll a
BOD
DO
Light
Dark
bation
CO2
Number
Taken
Taken
tion
Feet
Inches
PH
°C
mg/1
mg/1
mg/1 N
N0")-N
mg/1
^g/1
mg/1
mg/1
mg/1
*g/l
time-out
ng/1








Station
7 - Piscataway Creek
-Continued
21.1*8

8.08
5.08




70062337
6-22
lll|8
LSV
2

7.55
26
1.08B
.910
2.291
.710
1.273
90.0

6.13

9.0
67
6-23
12)6
El
2
16
7.60
27






112.5

6.66
8.59
1915
12.6
68

1218
E2
2
11

26.5






122.3

8.03



13.6
69

1221
E3
2
17
7.90
27






88.5

k.hh
6.52
a.5a
1715
70

1227
RSM
2
13

26.5






139.5

a. 93



9.8
71

1237
ROM
2
15
7.70
27






105.0

6.2a
7.76
5.72
1715
72

1235
ROM
10


26






111.8

5.90




73

1233
RCM
20


26.5






101.3

5.20

3.66

19.6
7U

12 53
HC
2
16
7.50
27






90.0

U.09
7.00
1715
75

1251
MC
10


27






75.0

3.63




76

12li8
MC
20


26.5






8O.3

3.59



16.1*
77

12l|3
MC
30

7.50
26.5






93.0

1.12
5.2a
3.57
1715
78

121*0
MC
ao


26.5






108.8

3.7a
6.53
3.ai
1715
16.a
79

1303
LCV
2
12

27






103.5

a.73




80

1301
LCV
10


27






91*. 5

a. 3a




81

1300
LCV
20
12

26.5






53.3

5.56




82

1307
LSV
2
12
7.60
26






120.8

6.59
9.02
5.99
1715
Ui.a
2ij21
6-21+
0110
El
2

7.15
25
1.1*20
.690
2.097
.1432
.771
3.01
8O.3
6.70
7.28



7.3
22

0105
E2
2


26
1.288
.835

.1*99
1.078

71.3

5.22




23

0100
E3
2

7.10
26
1.299
.835
2.355
.565
1.059
2.80
66.0
6.33
5.01



9.2
2h

0055
RSM
2


26
1.596
.631

.1*86
.555

112.5

10.98




25

001*5
RCM
2

7.20
26.5
1.398
.785
2.116
.612
.781*
l*.ol*
69.0
6.58
5.6a



9.0
26

RCM
10


26
1.1*20
.770

.588
.837

81*. 0

5.56




27


RCM
20


26
1.398
.800

.603
• 935

106.5

5.30




28

001*0
MC
2

7.20
27
1.51*1
.830
1.310
.51*7
.961
a. 51*
81*. 8
5.1*3
6.35



10.9
29


MC
10


26.5
l.$ll
.825

.1*91*
1.033

81.0

5-oa




30


MC
20


26.5
1.5U1
.830

.518
.91*1

81*. 8

5.12




31

0035
MC
30

7.10
26.5
1.321
.81*5
2.129
.51*6
1.033
1*.97
88.5
6.10
5-09



9.9
32


MC
1*0


26.5
1.156
.865

.517
1.01*6

86.3

a. so




33


MC
50

7.30
26
1.1*86
.855
2.013
.539
1.038
h. 51*
81*. 8
6.72
a. 81



8.3
3ii

0025
LCV
2


27
1.376
.790

.1*80
1.033

105.0

6.91




35


LCV
10


27
1.321
.800

.1*75
1.020

11*2.5

6.59




36


LCV
20


27
1.1*61*
.80 5

.1*96
1.059

86.3

7.05



10.a
37

0016
LSV
2

7.38
26
1.1*31
.925
2.555
.1*1*1
1.111
5.19
75.0
7.29
5.1*1



61

1322
El
2
12
7.90

1.322
.805
3.000
.1*32
1.018
6.72
81*. 8

7.27
9.1*6
6.a5
17U5
9.1*
62

1315
E2
2
15


1.267
.895

.1*52
1.21*3

78.8

5.96




63

1312
E3
2
13
7.1*0

1.256
.865
2.265
.1*95
1.287
5.07
75.0

7.a2
7.25
a.69
nus
11.a
61*

1307
RSM
2
13


1.333
.735

.1*1*3
.561*

129.0

5.67



10.6
65

1302
RCM
2
13
7.50

1.311
.820
1.613
-552
1.166
6.97
123.8

5.21
7.a2
5.20
17a 5
66


RCM
10



1.156
.790

.671
1.078

86.3

a. 92




67


RCM
20



1.278
.800

.692
1.106

97.5

a. 87



9.0
68

1253
MC
2
18
7.50

1.389
.81*5
2.220
.520
1.195
6.93
95.3

6.10
9.05
5.16
17 a5
69


MC
10



1.1*11
.672

.1*51*
1.295

61.5

a. 12





-------
Sample
Number
Date
Sample
Taken
Time
Sample
Taken
Sample
Loca-
tion
Sample
Depth
Feet
Secchi
Disk
Inches
Field
pH
Water
Temp
°C
Total P
Inorganic
p pou
mg/1
TK1I
mg/1 i'J
NO2+NO3
mg/1
NOi-N
NH3
mg/1 H
roc
mg/1
Chloro-
phyll a
^g/1
BOD
mg/1
DO
mg/1
DO
Light
mg/1
DO
Dark
mg/1
Incu-
bation
time-out
C02
mg/1








Station
7 - Piscatawav Creek -Continued

51.8

3.78




70062^70
6-2li
1253
MC
20



1.333
.815

.U36
1.265




na5

71
MC
30

7.20

1.389
.855
2.lili5
.hlO
1.3ia
7.73
65.3

U.18
6.21
3.70
11.0
72


MC
llO

7 .20

1.378
.795

.578
1.265

? 2.0

a.25


i7a5
12.2
73

12ij0
LCV
2
111


1.356
.8U0

.hhh
1.332

80.3

3.96




7k

LCV
10



1.333
.865

.hl9
1.355

67.5

3.96




75


LCV
20



1.1(67
.875

-U3U
1.362

71.3

3.78
8.85
5.65
na5

76

1227
lsv
2
16
7.60

1.300
.770
I.I18J1
• U3li
1.169
6.72
111.8

5.81
9.2
2 501
6-25
1105
El
2
12
7.90
27.5






60.0

3.67
10.15
5.13
1115
8.8
02

1100
E2
2
16

27






105-8

a. 06
6.3a
3.61
1115

03

1050
E3
2
111
7.60
27.5






51.0

a.27
11.0
Oil

10ti7
RSH
2
13

27






53.3

a.oa


1115
10.8
05

10U5
RCM
2
111
7.li5
27






63.8

a. 81
6.32
3.79
06

ioUo
RCM
10


27






51.0

3.aa




07


RCM
20


27






5a. 8

3.57

2.68
1115

08

1036
MC
2
15
7.2i0
27.5






55.5

a.as
6.79
10.8
09

1035
MC
10


27






60.8

3.9a




10

1033
MC
20


27






sa.0

3.35




11

1030
MC .
30

7.30







53.3

3.16
5.80
2.81
1115
12.2
12

1025
MC
ilO

7-ltO
26.5






61.5

3.ai
6.ai
2.72
1115
12.0
13

1015
LCV
2
7

27






66.0

3.53




lU


LCV
10


27






56.3

3.75




15


LCV
20


27






70.5

a.20

6.60
1115

16

1005
LSV
2
10
7.70
26.5






lia.8

7.as
13-37
8.8
072007
7-20
09U0
MC
Surface

7.30
26.5






a3.5

a. 52
10.02
3.75
1515
10.a
08
MC
ho

7.20
25.2






63.8

a. is
10.37
a. 13
1515
27.8
2101
7-21
1350
MC
Surface

1.20
26.5






a2.8

a. 53
6.76
a.62
1600
10.0
02

MC
IlO

7.30
26.5






a9.5

a.aa
6.23
a. 01
1600
9.8
2211
7-22
1050
MC
Surface
13
26
.962
.r/s
1.367
-auu
1.135
6.15
ai.3
7.90
a. 36
8.70
a. 15
I5a5

12
MC
ilO

25.5
1.019
.673
1.362
.850
1.151;
6.38
51.0
6.95
a.37
8.55
3.97
i5as









Station 8a -
Gunston
Cove







1615

70062229
6-22
1035
El
2
13
8.50
26






102.8

9.98
12.67
8.90
6.2
30

10U5
E2
2
13
8.10
26






sa.0

7.89


1615
7.0
31

1055
E3
2
12
7.50
25






62.3

7.22
9.08
6.31
6.6
32

1107
LSV
2
16
7.80
26






67.5

5.99


1615
5.6
33

mli
LCV
2
16
7.70
26






69.0

6.01
8.03
5.20
7.2
31;

1130
MC
2
' 13
7.J1O
27






109.5

6.06
7.69
a. 99
1615
9.a
35

1125
MC
15

7.60
26






52.5

a.79


1615
8.2
36

1120
MC
30

7.50
27






66.0

a.77
6.2a
a. 32
11.0
37

nU5
RCM
2
lh
7.70
26






39.0

5.99



10.0
38

llllO
RCM
10

7.55
27






6a. 5

5.78


1615
9.0
39

1150
RSM
2
9
7.60
26






50.3

6.6a
7.79
6.05
8.8

-------
Sample
Number
Date
Sample
Taken
Time
Sample
Taken
Sample
Loca-
tion
Sample
Depth
Feet
Secchi
Disk
Inches
Field
PH
Water
Temp
*C
Total P
pok
mg/l
Inorganic
P P0h
mg/1
TKN
rag/1 N
NO2+NO3
mg/1
N0-,-N
NH3
mg/1 N
TOC
mg/1
Chloro-
phyll a
t*g/l ~
BOD
mg/1
DO
mg/1
DO
Light
mg/1
DO
Dark
mg/1
Incu-
bation
time-out
C02
aa/1








Station
8a - Gunston Cove
-Continued








70062338
6-22
1058
El
2

8.95
26
.81?
.317
2.1*20
.295
.001
22.83
202.5
10.89
7.19



5.2
39

1157
E2
2

8.1(0
26.5
.836
.31*6

.91*0
<.100
23.09
120.0

9.1*6



1*0

1101*
E3
2

7.75
26
.929
.627
2.881*
1.851*
.625
21.11*
99.0
8.28
6.91



9.1*
1*1

1110
LSV
2

7.52
26.5
.911*
.655

1.067
.700
10.52
108.8

6.86



6.1*
1*2

1116
LCV
2

7.80
26.5
.830
.528
1.971*
2.667
.260
6.09
112.5
7.5U
7.06



1*3

1120
MC
2

7.1*0
26
.828
.555
1.671
2.875
.280
7.73
117.8
7.57
7 - 2ii



8.1*
U*


MC
15


26
.905
.552

2.817
.325
72.71*
97-5

6.20



8.8
1*5


MC
30

7.1*5
26
.985
.573
1.516
2.758
.1*50
6.21
97.5
7.65
6.71*



1*6

1130
RCM
2


26
.953
.616

2.61*2
.600
5.59
82.5

5.81*




1*7


RCM
10


26
.967
.627

2.583
.625
6.09
96.0

5.92




1*8

1137
RSM
2

7.80
26.5
.758
.1*91*
1.529
3.1*79
.11*0
18.60
67.5
6.11
8.15



5.0
83
6-23
1102
El
2
12
9.30
26.3






191.3

6.01*
19.65
13.55
1615

81*

1105
E2
2
11*

27






133.5

6.95




85

1112
E3
2
11*
8.00
27






127.5

7.1*7
9.83
5.87
1615
6.2
86

1117
LSV
2
13

26.5






llU.O

6.90




87

1121
LCV
2
1U
7.70
27






116.3

6.75
9.87
6.05
1615
9.1*
88

1125
MC
2
16
7.80
27






102.0

6.21*
9.71
6.11
1615
12.2
89

MC
15


26.3






101*. 3

6.59




90

1128
MC
30

7.50
26.5






99.0

5.20
7.38
i*.6l
1615
10.6
91

111*0
RCM
2
15

27






132.8

1*.87




92

1135
RCM
10


27






99.8

7.81*


1615

93

111*5
RSM
2
15
7.90
27






117.0

7.31
10.96
6.38
11.6
21*38
6-23
2320
El
2

8.00
26.5
.808
.370
1.91*9
.367
.001
5.19
11*6.3
9.1*9
It*.78




39

2330
E2
2


26
.992
.603

.700
.710

95.3

7.90




1*0

2333
E3
2

7.35
26
.971
.631
2.191*
.930
.555
1*.06
93.8
6.80
6.27



8.2
1*1

2337
ISV
2


26.5
.991
.583

.61*5
.700

105.0

7.67




1*2

231*0
LCV
2

7.1*1
26.5
.91*5
.1*1*6
1.290
1.0I4J4
.360
1*.10
93.8
6.85
7.1*0



6.2
1*3

2350
MC
2

7.25
26.5
.963
.550
1.639
1.083
.1*50
3.66
126.0
6.67
6.77



9.3
1*1*


MC
15


26
1.035
.583

1.059
.61*0

78.8

6.61



8.1*
1*5


MC
30

7.30
26
1.0U0
.625
1.536
1.053
.650
It. 51*
93.8
7.09
6.01



1*6

2357
RCM
2


26
1.068
.612

.952
.730

90.0

5.83




1*7


RCM
10


26
1.132
.652

.91*6
.700

69.0

6.11




1*8

21*00
RSM
2

7.10

.776
.1*50
1.168
1.175
.001
2.80
61.5
5.87
8.70



5.9
77
6—21*
1115
El
2
13
8.70

1.189

1.71*2
.782
.250
8.75
101.3

3.07
11*.53
9.71*
1630
3.1*
78

1122
E2
2
11


1.133


.765
.560

122.3

11.16




79

1130
E3
2
10
8.20

1.111
.529
1.1*78
.81*1
.250
9.80
115.5

9.72
11.39
6.36
1630
5-2
80

1136
LSV
2
12


1.167
.608

.893
.550

123.8

8.13




81

111*3
LCV
2
12
7.30

1.222
.587
1.161
l.Oll*
.530
7.73
100.5

6.26
9.77
t».76
1630
8.8
82

1150
MC
2
13
7.1*0

1.167
.600
1.91*2
1.032
.51*0
8.28
97.5

5.12
9.30
5.30
1630
10.8
83


MC
15



1.167
.602

1.08U
.520

105.0

5.09




81*


MC
30

7.30

1.111
.570
1.387
1.182
.310
6.85
99.8

5.12
7.02
a.39
1630
9.8
85

1200
RCM
2
15


1.133
.600

1.051*
.530

112.5

5.20




86


RCM
10



• 990
.625

1.008
.535

108.8

6.32




87

1206
RSM
2
13
7.1*0

.961*
.612
1.871
.968
.560
6.1*6
107.3

6.67
10.1*6
5.19
1630
10.a

-------

Date
Time
Sample
Sample
Secchi

Water
Total
P Inorganic NO0+NO3


Chloro
-

M
DO
Incu-

Sample
Sample
Sample
Loca-
Depth
Disk
Field
Temp
P01,
P PO^
TKN mg/1
HH3
TOC
phyll
a BOD
DO
Light
Dark
bation
CO2
Number
Taken
Taken
tion
Feet
Inches
PH
°C
mg/1
mg/1
mg/1 N NO^-N i
ng/1 N
mg/1
tig/1
mg/1
mg/1
mg/1
mg/1
time-out
mg/1








Station 8a - Gunston Cove -Continued









70072011
7-20
1015
MC
Surface

7.60
27





72.8

7.10
12.55
6.38
1515
7.2
12


MC
20

7.h2
27





99.8

6.19
11.30
5.13
1515
8.3
2105
7-21
1315
MC
Surface

7.25
26





69.8

5.55
9.09
5.67
1530
7.6
06


MC
25

7.30
26





91+.5

5-71
8.61
5.51+
1530
7.8
2215
7-22
1115
MC
Surface
1U

26
.691
.297
1.000 .981
• 311
5.1+7
106.5
5.32
6.31+




16


MC
20


25.5
• 8Ul
.366
1.31+6 .991
.312
6.57
110.3
6.15
5-69













Station 8
- Dogue Creek









70072009
7-20
1005
MC
Surface

7.60
27




92.3

6.70
12.63
6.30
1515
9.0
10


MC
20

7.1+5
27





87.8

5.91+
12.20
5-1+5
1515
8.6
2103
7-21
1330
MC
Surface

7.15
26





66.0

5.07
7.51
7.38
1530
8.1+
0U


MC
20

7.20
26





75.0

It.71+
6.96
1+.60
1530
9.0
2213
7-22
1150
MC
Surface
13

26
.775
• 51+3
1.207 .921+
.865
6.15
72.8
5.72
6.28
11.73
5-35
151+5

lh


MC
20


25-5
.826
• 51+2
1.133 1.000
.689
6.29
82.5
5.71
5.1+5
11.02
5.25
151+5










Station 9 -
Hallowing Point


8a.0

6.50

6.35
1515
6.6
70072013
7-20
1035
MC
Surface

7.65
27





12.27
11*


MC
20

7.50
27.5





96.8

6.38
11.35
5.62
1515
8.2
. 2107
7-21
1300
MC
Surface

7.1+0
25.5





66.0

6.96
9.71
5.77
1530
6.6
08


MC
20

7.50
25-5





120.8

6.00
9.1+3
5.50
1530
6.8
2217
7-22
1125
MC
Surface
12

26
.679
.3 78
1.001 .991
.156
6.38
105.0
5.U1
6.59
12.05
5.71+
15U5

18


MC
20


25.5
• 739
¦ 370
1.112 .81+3
.091+
9.03
87.8
6.15
6.31
12.06
6.11+
151*5










Station 10
- Indian Head









70072015
7-20
1050
MC
Surface

7.1+0
27





87.0

6.39
11.62
5.77
1515
8.6
16


MC
35

7.30
27





88.5

5.01+
9.90
1+.1+8
1515
8.1+
31


MC
Surface

7.35
27
1.900

8.072


681.8
>26.01+




8.5
2109
7-21
1250
MC
Surface

7.ii0
26





86.3

6.58
9.75
6.11
1530
6.2
10


MC
35

7.25
25.5





91.5

5.87
8.82
5.1*2
1530
6.8
2219
7-22
liao
MC
Surface
15

26
.679
.369
1.101 .972
.057
8.21
78.8
9.09
6.21+
11.28
5.62
151+5

20


MC
35


25.5
.758
.378
.915 .875
.038
8.03
90.0
1+.95
5-85
11.61
5-57
151+5







7.1+5


Station 10A
- Occoquan Bay









70072017
7-20
1120
MC
Surface

27




62.5

6.82
11.51
6.30
1515
7.a
18


MC
20

7.35
27





71+.3


10.32
5.22
1515
7.6
2111
7-21
1235
MC
Surface

7.1+0
26





101.3

6.32
9.88
6.23
1530
6.0
12


MC
20

7.30
25.5





93.8

5.29
10.11
5.51+
1530
6.8
2221
7-22
1150
MC
Surface
15

25.5
.61+3
.366
•995 .972
.029
6.83
73.5
1+.50
6.52




22


MC
20


25.5
.768
.365
.787 . 972
.026
7.25
93.8
7.25
6.12













Station 11
- Possum Point









70072019
7-20

MC
Suri'aue

7-70
28





86.3

6.58
10.00
6.26
1515
6.a
20


MC
20

7.50
28





79.5

6.38
9.1+2
5.82
1515
6.a

-------
Sample
Number
Date
Sample
Taken
Time
Sample
Taken
Sample
Loca-
tion
Sample
Depth
Feet
Secchi
Disk
Inches
Field
PH
Water
Temp
°C
Total
pok
mg/l
P inorganic M02+N03
P PO^ TKfl mg/l
mg/l mg/l N NO3-N
NH3
mg/l N
TOC
mg/l
Chloro
phyll
^k/i
a BOD
hir/I
DO
mg/l
DO '
Light
mg/l
DO
Dark
mg/l
Incu-
bation
tiae-out
C02
B3/1








Station 11 - Possum Point -Continued







6.8
70072113
7-21
1210
MC
Surface

7.50
26.5





lU3 - 3

7.66
12.93
7.31
1530
111


MC
25

8.00
26





89.3


9.58
5.67
1530
U.B
2223
7-22
1210
MC
Surface
13

26
.855
• 3?1
2.032 .95U
.025
12.0U
127.5
8.36
8.23
1U.23
7.60
15U5

21*


MC
20


26.5
.61* 0
.387
.931 .935
.022
5.1l7
73-5
h.97
6.18
10.12
5.92
151*5










Station 12
- Sandy Point








6.0
70072021
7-20
1205
MC
Surface

8.10
29





69.8

8.06
11.56
7.58
1515
22


MC
20

7.80
29





71.3

6.77
9.15
6.10
1515
5.6
211?
7-21
1150
MC
Surface

7.U0
26





ii7.3

6.09
8.01*
5.68
liiio
6.2
16


MC
20

7.50
26.5





6U.5

5.71
7.68
5.52
il*io
6.0
222?
7-22
1230
MC
Surface
17

26
.671
.1*1*3
.683
.016
5.88
81.0
3.81;
6.1*2
io.l*5
6.26
15U5

26


MC
20


25.5
.872
.530
.815
.023
6.02
27.8
U-63
5.1i 9
8.89
5.19
i5U5










Station 13
- Smith Point









7 007 2 023
7-20
1230
MC
Surface

8.20
28.5





81.0

7.75
10.29
7.27
1515
6.8
2l|


MC
20

7.50
28





101.3

6.21
8.53
5.90
1515
l*-6
32


MC
Surface

8.20
28.5
2.110

9.115


988.5
>21.58




1*.6
2117
7-21
1130
MC
Surface

7.60
26





59.3

6.37
8.20
5.96
ii*lo
6.0
18


MC
20

7.55
25.5





20.3

5.98
7.86
6.01
11*10
5.2
2227
7-22
121*5
MC
Surface
13

26
.81*9
.582
.808
.017
6.15
514.8
5.ol*
7.17
10.55
7.17
15U5

28


MC
20


25.5
1.075
.661
.787
.OliO
5.65
18.8
3.7li
6. U3
8.1*7
5.50
151*5










Station lii -
¦ Maryland Point









7007202?
7-20
1300
MC
Surface

7.80
29




1|6.5

7.10
7.78
6.83
1515
6.0
26


MC
25

7.ho
29





56.3

6.13
6.63
5.7li
1515
7.0
2119
7-21
1110
MC
Surface

7.20
26





16.5

5.71
7.22
5.U1
11*10
6.8
20


MC
25

7.1i5
25.5





36.0

5.59
7.15
5.63
11*10
7.2
2229
7-22
1300
MC
Surface
13

26
.9 28
.738
.659
.018
5.11
37.5
2.81
5.85
7.97
5.90
151*5

30


MC
30


25.5
1.189
• 775
.613
. 03li
6.03
36.0
U.28
5.18
7-liO
5.21
151*5










Station 1? -
Nanjemoy Creek









70072027
7-20

MC
Surface

7.80
28





52.5

6.67
7.51|
6.31
1530
7.6
28


MC
20

7.30
28





30.0

5.50
5.80
5.01
1530
8.2
2121
7-21
1050
MC
Surface

7.20
25.5





33.0

5.1i6
7.15
5-1+5
11*10
7.6
22


MC
20

7.10
25





30.8

5.39
6.52
5.51
11*10
7.8
2231
7-22
1320
MC
Surface
15

26
.792
.718
.319
.059
5.20
39.0

6.00
7.78
5.76
15U5

32


MC
20


25.5
.872
.725
.910 .301
.059
5.1i7
22.5
.10
5.05
6.20
l*.7l*
151*5









Station 16 -
Route 301 Bridge









70072029
7-20
1355
MC
Surface

7.90
27




Ii3.5

7.21*
7.62
7.11*
1530
5.6
30


MC
30

7.50
26.5





30.0

6.09
6.07
5.99
1530
6.8
2123
7-21
1010
MC
Surface

7.35
2U.5





97.5

6.19
8.2?
5.68
1U10
7.0
21|

13?0
MC
35

7.20
25





18.0

5.75
6.97
5.55
11*10
7.1*
2233
7-22
MC
Surface
20

25.5
.736
.653
.878 .239
'.02 k
U.51
17-3

5.90
6.77
6.18
1600

3ll


MC
30


25.5
.792
.636
.867 -17l|
.058
li.3B
9.0
.51*
5.28
5.71*
U.99
1600
M
O


-------
INSERT A
INSERT SCALE IN MILES
POTOMAC ESTUARY
DISSOLVED OXYGEN BUDGET STUDIES
1970
5	0	5	10
tjBH n-n, iiimnm ¦¦¦¦¦¦«	i
SCALE IN MILES

-------