-------
Sample
n.^ei
6TLlOl*66
1*'!'
1*6
/
6
' r r
r
1 •(
r~~;
115
11 .'9
1160
1161
116'
1163
1161*
1161
1166
1167
1168
1169
120'1
1^5
11*53
il*59
11*60
ll*6l
11*62
11*63
11*61*
11*65
11*66
11*67
11*6:
11*69
1506
170-;
1725
1357
i :;"
iK9
1360
1361
1062
1863
1861*
1865
1866
1867
1368
1903
isr5
191*9
? o; r
Date
Sample
Taken
11-1*
n-5
11-6
11- ('
11-
11-1C
11-11
11-12
11-13
11-11*
11-17
ll-ld
11-19
11-; o
Tiie
Saiiiple
Taken
1255
12 5
-------
-------
15
Sample
Number
69112021
2022
2023
2021*
2025
2026
2027
2028
2029
2030
2031
2506
2606
69110309
0325
01*69
01*70
01*71
01*72
01*73
01*7 1*
ol*75
01*76
01*77
0509
0609
0709
0809
1009
1026
1170
1171
1172
1173
1171*
1175
1176
1177
1178
1209
1226
11*70
11*71
11*72
11*73
11*71*
11*75
11*76
11*77
11*78
1509
1709
1726
1869
Date
Sample
Taken
11-20
11-21*
11-26
11-3
11-1*
11-5
11-6
11-7
11-8
11-10
11-11
11-12
11-13
11-11*
11-17
11-18
Time
Sample
Taken
1226
1223
12,18
1227
1225
1223
1218
1227
1225
1222
1218
11*15
11*15
0837
11*19
1311*
1318
1321
1325
1326
1311*
1318
1318
1311*
1025
1131*
1301
0650
071*0
1351*
0950
0951*
0957
0957
1000
0950
0954
0950
0951*
0925
1501*
1050
lol*7
1055
101*7
1057
1050
101*7
1050
101*7
1232
081*1
11*17
1119
Transect
Location
Station
A2
A3
Alt
Bl
B2
B3
Bl*
Cl
02
03
Ci*
Al
A2
A3
Al*
A5
Bl
B2
Cl
02
Al
A2
A3
Al*
A5
Bl
B2
Cl
C2
Al
A2
A3
Al*
Bl
B2
01
G2
Al
Total P Inorganic P
Water rag/1 mg/1 TKN
Temp °G POi POl* mg/1 N
1* A - Above Blue Plains STP -continued
.820
.99C
1.25
I.o5
./35
l.ol*
1.22
.865
.600
1.08
1.27
9 1.60
6 2.385
Station 5 - WW Bridge
16 ^3,0,
16 ->*.L
4.63
4.80
!*.92
4.9C
'4.93
1*.1*5
li.31*
U.81*
111 2.08
12.5 1.1*7
12 1.85
11.5 2.1*1*
11.5 2.91* 2.19
12 l.ll*
2.33
2.22
2.23
2.21
2.19
2.35
2.26
2.31*
2.27
11.5 2.21
12 1.1*8
1.96
1.91*
1.93
1.95
2.01*
2.00
1.86
2.12
?.02
12 ?.28
Q 1.65
9.5 2.08
2.13
mg/1
NO.,-N
.81*5
.655
• 4"".
.32")
LA
.217
.1*60
.372
. 37Q
.39
.38
.37
• 32
.32
.39
.37
.1*0
.38
.1*2
• 51*
.1*6
.878
.691
NH
mg/1 N
1.1*-
,>,"> . ,
; ' _(
1.92
1.1*3
• 575
1*.20
2.30
.902
2.23
2.16
2.18
2.21
2.07
2.22
2.15
2.22
2.16
2.1*1
l.Ol*
2.06
1.3r<
'
LA Laboratory accident
-------
-------
16
Sample
Number
69111870
1871
1872
1873
18"!*
1875
1876
1909
1926
191*1*
2032
2033
2035
2036
2037
2038
ro39
2507
2607
69110310
0326
01*78
01*79
Ol*8o
Ol*8i
01*82
0/*83
01*81;
01*85
01*86
ol*87
01*88
01*89
01*90
01*91
OglO
0610
0710
0810
1010
1027
1179
1180
Il8l
1182
1183
118U
1186
1187
1188
1189
1190
1191
1192
Date
Sample
Taken
11-18
11-19
11-20
11-21*
11-26
11-3
11-1*
11-5
11-6
11-7
11-8
11-10
11-11
Time
Sample
Taken
1122
1121*
1125
1119
1122
1119
1122
0957
1625
111*7
111*9
1151
1153
111*7
111*9
111*7
111*9
11*12
11*12
0832
11*11*
1355
1353
1350
131*2
131*0
1350
131*2
131*0
1350
131*2
131*0
135C
131*2
131*0
1020
1129
1257
061*6
0736
131*6
091*1*
091*2
0937
0932
0927
0937
0932
0927
0937
0932
0927
0937
0932
0927
Transect
Location
A2
A3
Al*
Bl
B2
Cl
C2
Al
A2
A3
Al*
Bl
B2
Cl
C2
Al
A2
A3
Al*
A5
Bl
B2
B3
Cl
C2
C3
Dl
D2
D3
Al
A2
A3
Al*
A5
Bl
B2
B3
Cl
C2
03
Dl
D2
D3
Total P Inorganic P
Water mg/1 mg/1 TKN
Temp *C P0|( P0|, mg/1 N
Station 5 - WW Bridge -continued
2.U2
2.11
2.07
2.19
2.1*7
2.21
2.50
10 3.86 2.26
10.5 2.31*
2.1*1
1.01*
1.03
1.1*3
1.59
1.37
1.03
1.05
1.05
9 1.86
8.5 3.209
Station 5A - Rosier Bluff
16 >3.0
15 2.79
1*.60
1*.69
1*.61*
2.51*
3.57
3.65
3.80
3.93
3.90
3.90
3-98
1*.00
1*.02
1*.17
15 3-38
13 3.07
12 1.76
11 3-63
11 3.33 2.69
12 1.73
3-98
1*.22
1*.06
1*.10
l*.oo
l*.oo
1*.10
l*.oo
1*.18
It. 1/t
1*.06
1*.18
1*.20
1*.06
mg/13
NO^-N
.722
.735
1.03
.606
.605
.387
LA
.282
.589
.1*13
.21*6
.19
.1*6
.28
.31
.28
.33
.31*
.29
.37
.37
.31*
• 37
.38
.33
NH,
BE/I N
1.65
2.09
1.08
>2.0
>2.0
5.65
3.25
1.67
1*.85
2.98
1.75
8.61
2.35
2.22
3.31*
1.96
2.09
2.25
2.16
2.50
2.kk
2.07
2.07
2.1*7
2.25
LA Laboratory accident
-------
-------
17
Sample
Number
>9111210
1227
11*79
ll*8C
11*81
11*82
11*83
IkBk
11*85
11*86
11*87
11*88
11*89
11*90
11*91
11*92
1510
1710
1727
1877
1878
1879
i860
1881
1882
1883
1881;
1885
1886
1887
1888
1889
1890
1910
1927
201*0
201*1
20li2
201*3
201*1*
201*5
201*6
201*7
201*8
201*9
2050
2051
2052
2053
2508
2608
120101
Date
Sample
Taken
11-12
11-13
ll-ll*
11-17
11-18
11-19
11-20
11-21*
11-26
12-1
Time
Sample
Taken
0921
11*58
101*2
101*0
1037
1030
1027
1037
1030
1027
1037
1030
1027
1037
1030
1027
1230
0837
11*13
1111
1110
1105
1102
1057
1105
1102
1057
1105
1102
1057
1105
1102
1057
0951*
1621
111*0
1138
1131*
1128
1125
1131*
1128
1125
1131*
1128
1125
1131*
1128
1125
11*07
11*08
1217
Transect
Location
Station
Al
A2
A3
Al*
A5
Bl
B2
B3
Cl
C2
C3
Dl
D2
D3
Al
A2
A3
Al*
A5
Bl
B2
B3
Cl
C2
03
Dl
D2
D3
Al
A2
A3
Al*
A5
Bl
B2
B3
Cl
C2-
03
Dl
D2
D3
Total P Inorganic P NOj+NO-,
Water mg/1 mg/1 TKK rag/'l NHn
Temp °C POli PO), mg/1 N NOj-N mg/1 K
5A - Rosier Bluff -continued
11 2.95 .1*0 2./7
12.5 2.63 .38 1.71*
2.30
2.38
2.1*2
2.50
2.1*2
2.30
2.28
2.31*
2.31*
2.1*?
2.?8
2.31*
2.38
2.36
11 2.2L .kh ?.^(-
9 1.88 .8)47 1.6U
9 2.32 .55'- MO
2.33
2.13
?.U2
2.1*1*
2.29
2.32
2.30
2.26
2.31
2.32
2.30
2.30
2.31
10 k.lf 2.60 .691* 2.13
10 2.13 .700 1.97
.975
.855
.895
.920
1.10
.935
.930
1.12
.91*5
1.07
1.17
.950
1.05
1.17
9 1.86 .BQk 1.1*C
8.5 3.538
7 1.78 .890 1.93
A Laboratory accident
-------
-------
18
Sample
Number
.li 311
'' 32 (
0492
049 3
• 4l 4
049"
>-• 496
49"'
• ;'"
(,,OC
,'4100
Ul.l
1,4! "'
04103
O''ll
0^11
oVll
0811
1011
102 f'
1193
1194
1195'
1196
1197
11 9 '3
1199
11100
lllol
1110?
11103
1?11
1228
1V;3
l4°4
l4°5
Iit96
l4°7
1.49H
1499
lUlOO
lulOl
1U102
lj'11
1/11
me.
1891
1892
1893
189.'4
1695
1896
1897
Id98
1'MQO
Date
Sample
Taken
11-3
11-4
11-5
11-6
11-7
11-8
11-10
11-11
11-12
11-13
11-lk
11-17
11-18
Time
Sample
Taken
0825
1-409
li(0o
140°
l/ll 2
1416
142 ;
142-
143 '
1'412
l4l (>
1412
llU-6
I4l6
101?
1123
12'?
06UC
0730
13U1
13U9
13U7
134:
1341
1331
1328
1325
1344
134C
13U3
1339
0^18
1453
0958
1COO
lOOij
1012
101 f
IOC '4
1012
100k
1012
1012
1225
083<
ikio
1106
1105
1101)
1100
1050
1103
105^
1102
1058
Total P
Transect Water mg/1
Location Temp °C PO^
Station 6 - Broad Creek
15.5
1U.5
Al
A'
A3
A 4
A 5
A6
A
Bl
B2
Cl
C .'
Dl
15
12
12.'
11
11 7 . 36
11. 'J
Al
A 2
A3
Ah
Ar'
A6
A7
Bl
B2
Cl
C2
11
12
Al
A2
A3
A4
A5
Bl
B2
Cl
C2
Dl
11
9
q
Al
A2
A3
AJj
A5
Bl
B2
Cl
C2
Inorganic P
mg/1 TKH
P0)t m&/l N
>3.o
2.U1
4.10
3.67
3.25
3.25
3.26
2.82
2.35
2.90
3.23
3.21
3.214
3.28
3.98
3.75
1.98
2.92
4.13
1.96
4.90
4.94
4.52
4.20
k.io
It. 18
4.2/4
4.30
4.10
4.1)4
4.28
3.0k
2.58
2.86
2.58
2.50
2.i|0
2.36
2.52
2.48
2.50
2.50
2.44
2.38
1.80
2.62
1.53
1.93
2.06
2.12
1.95
2.2k
2.18
2.28
2.26
mg/1
NO,-N
.655
.738
.409
LA
.331
.762
.599
.252
.38"
.37
.38
.46
.32
.40
.ko
.ko
.36
.35
.47
.51
.35
.50
.793
.53!;
NH3
ffls/l N
>2.0
>2.0
5.21;
il.30
2.07
4.85
2.71
2.1,3
3.38
3.00
2.51
3.78
2!59
2.62
2.1^6
2.31
2.53
2.88
1.93
2 5k
l'.7k
2.19
L..-'oratory accident
-------
-------
19
Sample
Number
Date
Sample
Taken
Time
Sample
Taken
Total P
Transect Water mg/1
Location Temp °C POJ^
Inorganic P
mg/1 TKN
POj, mg/1 N
mg/1
NO^-N
NH3
mg/1 N
Station 6 - Broad Creek -continued
9H1911
1928
191*5
2051*
2055
2056
2057
2958
2059
2060
2061
2062
2063
2061;
2065
2509
2609
120102
.9110328
oiaol*
oia 05
01*106
01*107
01*108
01*109
01*110
01*111
01*112
01*113
01*111*
olai5
01*116
01*117
01*118
0512
0612
0712
0812
1012
1029
11101*
11105
11106
11107
11108
11109
11110
11111
11112
11113
mil*
11115
11116
11117
11118
11-19
11-20
11-21*
11-26
12-1
11-3
11-1*
n-5
11-6
11-7
11-8
11-10
11-11
0951
1613
1208
1206
1201*
1200
1155
1153
H5l
1203
1159
1202
1158
1157
11*01
11*05
1206
11*00
11*55
11*59
1502
1507
1510
1512
1515
1502
1507
1502
1507
1502
1507
1502
1507
1002
ml*
121*2
0631
0722
1331
1309
1308
1306
1300
121*9
121*3
121*0
1305
1259
1301*
1258
1303
1257
1302
1256
10 3.91*
9.5
2.52
Al
A2
A3
Al*
A5
A6
A7
Bl
B2
Cl
C2
Dl
9
8.5 3.055
7
Station 7 - Piscataway Creek
15
Al
A2
A3
Al*
A5
A6
A7
Bl
B2
Cl
C2
Dl
D2
El
82
11*
12
12.5
11
11 1.58
12
Al
A2
A3
Al*
A5
A6
A7
Bl
B2
Cl
C2
Dl
D2
El
E2
2.36
2.11*
2.38
2.89
2.31*
2.21
2.26
2.17
1.96
2.28
2.30
2.28
2.25
2.25
1.97
2.01;
1.88
1.70
1.85
1.99
2.21
2.21
2.31
1.71
1.97
2.23
2.09
2.20
2.08
2.21
2.02
2.21
3.1*9
3.87
3.17
3.29
1*.OG
2.87
l*.5o
U.50
l*.6o
U.51*
h.hk
2.30
2.89
3.20
3-35
3.50
3.U8
3.1*8
3.17
3.1*8
3.1*1*
.662,
.671
.886
.856
1.05
.763
LA
.51*6
1.03
.795
.389
.1*5
.51*
• 57
.60
• 55
• 53
.51*
-55
• 55
.65
.60
.61*
.55
.59
.57
2.01
2.11
1.71;
1.96
1.79
1*.37
h.kl
2.87
1*.28
3-32
2.70
2.96
2.81
2.91;
3.12
2.81;
2.81*
2.78
2.87
2.85
3-50
3.10
2.91*
2.68
3.00
2.90
A Laboratory accident
-------
-------
20
Sample
Number
69111212
1229
14103
14104
i4io5
14106
14107
14108
14109
i4no
14111
14112
14H3
i4n4
i4n5
1512
1712
1729
18101
18102
18103
18104
18105
18106
18107
18108
18109
18110
18111
18112
18113
1912
1929
1946
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2510
2610
120103
69110329
0512
0713
0813
Date
Sample
Taken
11-12
11-13
11-14
11-17
11-18
11-19
11-20
11-24
11-26
12-1
11-3
11-5
11-7
11-8
Time
Sample
Taken
0910
1443
0947
0945
0940
0935
0930
0940
0935
0940
0935
0940
0935
0940
0935
1216
0827
1402
1128
1127
1128
1119
1112
1124
1118
1123
1117
1122
1116
1121
1115
0944
1602
1145
1143
n4i
1135
1130
1128
1126
il4o
1134
1139
1133
1138
1132
1137
1131
1353
1358
1155
1350
1002
1233
0620
Traasect Water
Location Temp °C
Station 7 - Piscataway
11
12
Al
A2
A3
A4
A5
Bl
B2
Cl
C2
Dl
D2
El
E2
11
9
9
Al
A2
A3
A4
A5
Bl
B2
Cl
C2
Dl
D2
El
E2
9
10
Al
A2
A3
A4
A5
A6
A7
Bl
B2
Cl
C2
Dl
D2
El
E2
9
8.5
7
Station 8 - Dogue
14.5
14
12
10.5
Total P Inorganic P N02+N03
mg/1 mg/1 TKN mg/1
PO), PO), mg/1 N HO^-N
Creek -continued
2.89 .64
2.84 .38
2.56
2.88
2.60
2.64
2.60
2.58
2.64
2.60
2.52
2.66
2.52
2.54
2.38
2.44 .66
2.10 .634
2.30 .529
2.34
2.34
2.32
2.28
2.24
2.30
2.28
2.34
2.42
2.48
2.42
2.50
2.40
3.22 2.18 .562
2.18 .690
3.13
2.30
2.22
2.30
2.28
2.32
1.98
2.26
2.41
2.39
2.30
2.39
2.37
2.30
2.31
2.34
2.04 .804
2.604
2.05 " — • .874
Creek
1.13 1.11
3.49 .763
2. 86 .847
1.55 1.17
NH3
mg/i N
2.84
2.72
2.48
2.12
2.34
2.05
2.10
1.87
1.89
.435
4.37
2.63
1.59
-------
-------
21
Sample
Number
?111013
1030
11119
11120
11121
11122
11123
11121*
11125
11126
11127
11128
11129
11130
1213
1230
1513
1713
1730
18111*
18115
18116
18117
18118
18119
18120
18121
18122
18123
1913
1930
191*7
2081
2082
2083
2081*
2085
2086
2087
2088
2089
2090
2091
2092
2511
2611
120101*
9110330
0711*
101k
1031
11131
11132
11133
Date
Sample
Taken
11-10
11-11
11-12
11-11*
11-17
11-18
11-19
11-20
11-21*
11-26
12-1
11-3
11-7
11-10
11-11
Time
Sample
Taken
0711*
1321
1212
1208
1203
1200
1156
1152
111*8
1159
1155
1151
111*7
1151*
0905
il*3l*
H15
0818
1355
111*6
Hl*l*
111*2
1138
1135
111*3
111*1
1137
1131*
111*0
0936
1550
1117
1116
mi*
1113
1110
1106
1101*
1112
1109
1105
1103
1108
131*1*
131*9
111*6
131*1*
1227
0709
1311*
1135
1130
1127
Transect
Location
Station
Al
A2
A3
Al*
A5
A6
A7
Bl
B2
B3
Bl*
Cl
A3
Al*
A5
A6
A7
Bl
B2
B3
Bl*
Cl
Al
A2
A3
Al*
A5
A6
A7
Bl
B2
B3
Bl*
Cl
Al
A2
A3
Total P
Water mg/1
Temp °C PO),
8 - Doeue Creek -continued
11 2.33
11
11
11
10
9
8.5
9 3.1*1*
9.5
2.31*
9
8 3.151*
7
Station 8A - Gunston Cove
Ik
12
10.5 2.11
11
Inorganic P
mg/1 TKN
PO), mg/1 N
1.99
3.38
3.1*2
3.1*6
3.25
2.69
3.09
3.06
3.29
2.89
3.11*
3.23
2.88
3.09
2.28
2.95
1.89
2.32
2.10
2.38
2.1*0
2.38
2.31*
2.28
2.52
2.1*6
2.1*2
2.38
2.32
2.26
1.79
2.08
2.08
2.10
2.25
2.30
2.30
2.23
2.27
2.38
2.30
2.31
2.37
2.11
1.78
1.06
-2.51
1.77
3.1*0
2.85
2.1*9
2.69
mg/1
NCVN
1.21*
.559
.99
.81
.81*
.89
.86
.89
.91*
.56
.96
.90
.97
1.02
.95
.57
1.06
.585
.71*6
.560
.832
.663
.81*7
1.10
1.02
1.26
.703
.96
.90
.95
mg/1 N
2.26
2.78
3.38
3.93
2.63
2.90
1*.78
5.12
3.1*8
11.05
2.69
3.1*5
3-69
2.97
2.60
2.67
1.98
2.29
2.21
2.08
2.06
2.01
1.83
.1*1*7
2.56
1.95
2.73
3.09
5.13
3.91*
-------
-------
22
Sample
Number
'1111134
11135
11136
11137
11138
11139
11140
1214
1231
1714
1731
18124
18125
18126
18127
18128
18129
18130
18131
1914
1930
2093
2094
2095
2096
2097
2098
2099
20100
20101
20102
2512
2612
120105
Date
Sample
Taken
11-11
11-12
11-17
11-18
11-19
11-20
11-24
11-26
12-1
Time
Sample
Taken
1124
1121
1114
1109
1120
1113
1119
0900
1428
0812
1351
1204
1202
1159
1155
1150
1158
1154
1157
0931
1542
1057
1056
1054
1052
1050
1046
1043
1049
1045
1048
.1338
1344
1140
Transect
Location
Station
A4
A5
A6
A7
Bl
B2
Cl
A3
A4
A5
A6
A7
Bl
B2
Cl
Al
A2
A3
A4
A5
A6
A7
Bl
B2
Cl
Total P Inorganic P
Water mg/1 mg/1 TKN
Temp °C POij PO), mg/1 N
8A - Gunston Cove -continued
2.61
2.69
2.68
2.65
2.70
2.30
2.61
11 2.09
11 2.33
8.5 2.15
8.5 i 92
2i36
2.28
2.38
2.24
2.12
2.30
2.26
2.34
9 3.00 2.11
9.5 1.48
.834
1.38
1.78
1.98
2.20
2.17
2.00
2.21
2.03
2.21
9 2.05
8 2.714
7 1.62
N02+NO-3
mg/1
N03-N
1.02
1.01
1.10
1.22
1.13
1.12
1.15
1.05
.79
.641
.746
.610
.914
.640
.879
NHj
mg/l N
2.90
3.97
3.28
2.09
2.81
1.34
2.18
2.62
2.53
2.32
2.16
2.13
1.83
1.98
1.80
Station 9 - Hallowing Point
110715
1015
1032
11141
11142
11143
11144
11145
11146
ni47
11148
11149
11150
1215
1232
1715
1732
18132
18133
18134
18135
11-7
11-10
11-11
11-12
11-17
11-18
1218
0700
1305
1100
1055
1051
1043
1059
1054
1050
1053
1049
1048
0855
1420
0807
1345
1222
1219
1215
1209
Al
A2
A3
A4
Bl
B2
B3
Cl
C2
Dl
Al
A2
A3
A4
11.5 1.73
10.5 . l.$7 1-26
11 1.76
.965
1.30
1.37
1.26
1.35
1.26
1.38
1.37
1.38
1.39
10.5 1.08
11 1.84
8.5 2.07
8.5 1.62
1.25
1.78
1.77
1.67
1.17
1.31
.963
1.22
1.23
1.26
1.22
1.22
1.28
1.24
1.27
1.26
1.24
1.20
1.08
.741
.817
1.77
1.96
1.98
1.13
- 1.46
1.47
1.31
1.44
1.29
1.49
1.38
1.53
1.47
1.27
2.06
2.24
1.91
-------
-------
23
Sample
Number
118136
18137
18138
18139
18140
18141
1915
1932
1948
20103
20104
20105
20106
20107
20108
20109
20110
20111
20112
2513
2613
?0106
.0716
1016
1033'
11151
11152
11153
1H54
11155
11156
11157
11158
11159
11160
11161
11162
1216
1233
1716
1733
18142
18143
18144
18145
18146
18147
18148
18149
18150
18151
18152
18153
1916
1933
Date
Sample
Taken
11-18
11-19
11-20
11-24
11-26
12-1
11-7
11-10
11-11
11-12
11-17
11-18
11-19
Time
Sample
Taken
1219
1221
1214
1217
1213
1212
0920
1534
1038
1035
1031
1026
1037
1034
1030
1033
1029
1028
1330
1338
1122
1207
0652
1251
1028
1026
1022
1019
1013
1024
1018
1012
1017
1011
1015
1010
0850
1411
0800
1337
1245
1242
1238
1236
1231
1241
1235
1230
1234
1229
1233
1228
0917
1523
Transect
Location
Station
Bl
B2
B3
Cl
02
Dl
Al
A2
A3
A4
Bl
B2
B3
Cl
C2
Dl
Al
A2
A3
A4
A5
Bl
B2
B3
Cl
C2
Dl
D2
Al
A2
A3
A4
A5
Bl
B2
B3
Cl
C2
Dl
D2
Total P Inorganic P
Water mg/1 mg/1 TKN
Temp °C P0|i P0f| mg/1 N
9 - Hallowing Point -continued
1.34
1.59
1.77
1.65
1.69
1.68
8.5 3-50 1.90
10 1.41
1.56
1.29
1.72
1.78
1.57
1.81
1.84
1.91
1.86
1.90
1.88
9 2.09
8 3.978
7 1.58
Station 10 - Indian Head
11 1.20
10.5 1.H8 1.04
11 1.35
.880
.845
.885
.880
.825
.890
.835
.795
.770
.790
.840
.805
10.5 1.01
11 1.35
8.5 1.83
9.5 1.49
1.13
1.28
1.47
l!47
1.33
1.'49
1.53
1.53
1.52
1.52
8.5 2.66 1.38
10 1.20
mg/1
NO^-N
.670
.979
.623
.890
1.23
1.31
.979
1.23
1.23
1.23
1.23
1.23
1.23
1.23
1.25
1.22
1.23
1.24
1.29
1.22
1.16
.902
.901
.860
1.07
NH3
mg/1 N
2.00
1.72
2.04
1.80
1.13
.956
i.4o
.69
.71
.76
.72
.71
.77
.70
.62
.6?
.62
.73
.63
1.03
i.4i
2.04
1.78
1.75
1.52
-------
-------
2k
Sample
Number
Date
Sample
Taken
Time
Sample
Taken
Transect Water
Location Temp °C
Total P Inorganic P
mg/1 mg/1 TO
P04 POli me/1 N
mg/1
N03-N
NH
mg/1 N
Station 10 - Indian Head -continued
J1120113
20115
20116
20117
20118
20119
20120
20121
20122
20123
20121;
2514
2611;
120107
J1111163
1217
123k
1717
1734
1917
2515
2615
120108
?U25l6
2616
120109
J110333
0339
0533
0617
0717
1017
1036
1235
lSi4
1747
1748
1959
2519
2520
120112
11-20
11-21;
11-26
12-1
11-11
11-12
11-17
11-19
11-21;
11-26
12-1
11-21;
11-26
12-1
11-3
11-1;
11-5
11-6
11-7
11-10
11-11
11-12
11-14
11-17
11-18
11-19
11-21
11-21;
12-1
1017
1015
1012
1010
1005
101k
1009
1004
1008
1003
1007
1002
1320
1330
1112
0942
0830
1339
07 kO
1320
0900
1300
1309
1048
1250
1256
1040
iltio
1050
1055
1140
1130
1130
1500
1120
1030
1130
1200
0955
1130
1030
1055
Al
A2
A3
Al;
A5
Bl
B2
B3
01
02
Dl
D2
8.5
8
7
Station 11 -
11
11
8
9.5
9
8
8
7
Station 12
8
8
7
Station CB3
1U
Ik
11
11
9
11
11
10
10
V
9
5
7
5
3.371;
Possum Point
1.72
2.791
- Sandy Point
3.0kk
- Great Falls
.746
.252
.231
• k03
.489
.469
.431
.728
• kkl
.453
.393
.238
.388
1.11
l.lk
1.52
1.62
1.72
1.19
1.53
1.63
1.59
1.66
1.60
1.61
1.83
1.55
.547
.532
.440
1.00
..787
.670
1.14
1.00
.830
.745
.068
.067
.080
.106
.200
.210
.217
.602
.260
.256
.221;
.287
.301
.386
.241
1.69
.810
1.08
3.21
7.32
.496
.052
.372
1.05
1.88
.966
.758
.882
.764
.352
.641
.888
.87
.83
1.05
1.09
.873
.992
.845
.937
.886
.919
ND
.095
.200
.389
.922
.799
1.50
i.ok
.99
.965
1.02
1.02
1.608
1.16
.990
1.91
1.84
.37
.37
.40
1.18
.769
1.15
1.51
1.19
.955
.887
.120
.119
.251
.110
.194
.231
1.30
.126
.104
.190
.058
.126
.266
.124
.054
Not detectable
-------
-------
Ill SURVEY RESULTS
1969
POTOMAC ESTUARY PHOSPHATE STUM-
SEWAGE TREATMENT PLANTS DIURNAL STUDY
AWNAPOLIS FIELD OFFICE
Sample
Number
11053d
35
36
37
38
39
l*o
Date
Sample
Taken
11-3
11-1*
Time
Sample
Taken
21*00
-QfcOO
0800
1200
1600
2000
21*00
Flow
mgd
Station
23
10
12
27
22
25
26
Total P Inorganic
mg/1 mg/1
PO], PO),
1 - Alexandria
70.16
71*. 51*
62.51
51*. 61*
71.26
76.72
73.1*1*
32.5
1*1.5
31*. 3
26.6
38.1*
1*6.9
1*1*. 5
P
TKN
mg/1 N
1.53
20.9
1.93
28.1
27.8
16.3
17.0
N02+N03
mg/1
NO^-N
.ND
.010
.207
.1*03
.051
.126
.013
NH^
mg/1 N
18.5
19.5
20.6
26.2
20.2
29.5
23.1*
Station 2 - Arlington
110718
19
20
21
22
23
21*
iio5Ui
1*2
1*3
14*
1*5
1*6
111735
36
37
38
39
1*0
1*1
1*2
1*3
I*U
1*5
1*6
11-3
11-1*
11-3
11-1*
11-9
11-10
11-11
21*00
01*00
0800
1200
1600
2000
21*
2UOO
01*00
0800
1200
1600
2000
21*00
01*00
0800
1200
1600
2000
21*00
01*00
0800
1200
1600
2000
Station
Station 1* -
1.0
6.5
2.0
2.0
1.0
1.5
5
ii.O
2.0
3.0
2.0
2.5
35-61*
32.18
32.29
25.59
30.95
31.28
36.76
3 - Blue Plains
53.77
53.77
52.68
1*6.67
1*6.12
51.58
Fairfax - Westgat,e
1*1*. 26
1*2.27
26.61*
21.27
55.16
59.89
39.85
39.85
31*. 35
50.86
1*0.07
37.65
19.5
28.5
32.7
29.3
31.0
33.0
32.9
31.0
28.2
25.7
21.5
20.3
21.2
7.39
1*.58
3-56
12.1
10.0
5.36
8.37
17.0
20.0
17.0
21.6
30.1
33.0
11.5
11*. 5
18.0
17.7
18.3
19.2
11*. 9
.022
.023
.026
.021
.019
.022
11*. 7
1.71*
.388
13.7
12.8
9.6
12.3
15.9
16.5
13.1
15.9
19.7
19.1*
D Not detectable
-------
-------
Ill SURVEY RESULTS
1969
POTCMAC ESTUARY PHOSPHATE
SEWAGE TREATMENT PLANTS
2l*-HOUH CCMPOSITES EFFLUENT
AUNAPOLIS FIELO OFFICE
26
Sample
Number
6911033U
38
051*7
69110725
26
27
69110336
051*8
0618
6911051*9
0619
0728
Date
Sample
Taken
11-2
11-3
11-1*
11-3
11-5
11-3
11-5
11-1*
n-5
11-7
Flow
mgd
Station
19
18
18
Station
17.1*
17.1*
18
Station
261.82
251.66
238.61
Station 1* -
Total P Inorganic P
mg/1 mg/1
PO], PO],
1 - Alexandria
1*0.51 28.2
lili.86 til.O
55.96 35-7
2 - Arlington
31*. 52 31*. 7
32.85 31*. 1
27.82 31*. 3
3 - Blue Plains
27.88 21*. 7
39.56 26.8
23.69 16.8
Fairfax - Westgate
1*5.03 30.1
37.21 26.5
31*. 60 27.0
TKN
mg/1 N
18.0
25.8
28.8
11*. 1*
6.21*
5.59
17.6
21.9
71.2
25.5
109.2
280.0
mg/13
NOi-N
.015
15-9
16.2
81.5
.025
.016
.01*7
.025
.017
ND
NH3
mg/1 N
21*.5
28.0
?5.6
12.0
10.6
12.3
21.2
18.1
18.9
20.8
27.8
30. li
ND Hot detectable
-------
-------
BELLEVUE-*
ABOVE BLUE PLAINS STP -
WOODRO* WILSON BRIDGE -
1969
SCALE N MIES
POTOMAC ESTUARY
-------
-------
Chesapeake Technical Support Laboratory
Middle Atlantic Region
Environmental Protection Agency
Water Quality Office
1966 - 1968 Data Report
Number 11
NUTRIENT DATA ON SEDIMENT SAMPLES
OF THE
POTOMAC ESTUARY
by
James W. Marks
and
Orterio Villa Jr.
Laboratory Staff
Donald W. Lear, Jr., Chief, Laboratory Section
Anna R. Favorite, Statistician
-------
TABLE OF CONTENTS
Page
I INTRODUCTION 1
II STATION LOCATIONS 7
III SURVEY RESULTS 13
IV MAP appendix i
-------
I INTRODUCTION
A. Purpose and Scope
During the years of 1966 through 1968 the Chesapeake
Technical Support Laboratory, Middle Atlantic Region, Federal
Water Quality Administration conducted three separate surveys
of the bottom sediments of the tidal portion of the Potomac
River. The purpose of these surveys was to determine the
existing quality of the river bottom. The results of these
investigations are presented in this report.
B. General Remarks
In 1966 the portion of the Potomac River between the lljth
Street Bridge in Washington, D.C. to the U.S. Route 301 Bridge
near Morgantown, Maryland, was sampled three times, March-May,
June-August and September-October. In 196? the same portion
of the river was sampled twice, March-April and again during
September. In 1968 that portion of the river between the U.S.
Route 301 Bridge to the mouth of the river at Point Lookout
was sampled once during February.
C. Sampling Procedures
Sediment samples were collected using a weighed core
sampling device. This device consisted of a length of pipe
containing a plastic core liner and a heavy weight (core bomb)
for forcing the core pipe into the sediments. The sediment
-------
was removed from the plastic liner by means of an extruder rod.
The top five centimeters from each of four separate core samples
from each sampling station were blended as the sediment sample
for that station. The samples were then returned to the
laboratory and frozen for later analysis.
B. Measured Parameters and Analytical Methods
1. 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
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.
A measured volume of the wet sediment sample, of which
the dry-solids content is known,was placed in a 16 oz. prescription
bottle and diluted to 300ml with distilled water. The sample was
then agitated on a mechanical shaker for 30 minutes. An aliquot
of the well mixed, diluted sample was removed for analysis. Total
Phosphate was determined after persulfate oxidation of the sample
in an autoclave at 15 psi for 30 minutes and millipore filtration
to remove unwanted solids. The resultant ortho-phosphate was
then determined colorimetrically as the molybdenum-blue complex
-------
3
with the optical density measured at 882 mt-i. The results were
calculated as milligrams POj.-P per gram of dry sample.
2. Inorganic Phosphorus
Reference: Murphy, J. and Riley, J.P.. 1962. A
Modified Single Solution Method for the Determination of
Phosphate in Natural Waters. Analytica Chimica Acta, 2?: 31-36.
A measured volume of the wet sediment sample, of which
the dry-solids content is known,was placed in a 16 oz. pre-
scription bottle and diluted to 300ml with distilled water. The
sample was then agitated on a mechanical shaker for 30 minutes.
An aliquot of the well mixed, diluted sample was removed for
analysis. Inorganic Phosphorus was determined, after millipore
filtration to remove unwanted solids, colorimetrically as the
molybdenum-blue complex with the optical density measured at
882 mn. The results were calculated as milligrams PO^-P per
gram of dry sample.
3. Total Kjeldahl Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed.. 1965.
A measured volume of the wet sediment sample, of which
the dry-solids content is known, was placed in a 16 oz. pre-
scription bottle and diluted to 300 ml with distilled water. The
sample was then agitated on a mechanical shaker for 30 minutes.
-------
/ k
/
/
An aliquot of the well mixed, diluted •sample was removed for
analysis. Total Kjeldahl Nitrogen includes Ammonia and
Organic 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, nesslerized and determined colorimetrically with
the optical density measured at \$$ m^. The results were
calculated as milligrams TKN-N per gram of dry sample.
h. Ammonia Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed.. 1965.
A measured volume of the wet sediment sample, of which
the dry-solids content is known,was placed in a 16 oz pre-
scription bottle and diluted to 300 ml with distilled water.
The sample was then agitated on a mechanical shaker for 30
minutes. An aliquot of the well mixed, diluted sample was
removed for analysis. The aliquot was diluted to a known
volume and the pH adjusted to 7.2-7.k and distilled, collect-
ing the distillate in 2% boric acid. An aliquot of the
distillate was nesslerized and the ammonia nitrogen con-
centration determined colorimetrically with the optical density
measured at 1|25 mM-. The results were calculated as milligrams
of NH^-N per gram of dry sample.
-------
5
5>. Chemical Oxygen Demand
Reference: Standard Methods for the Examination of
Water and Waste-water, 12 ed.. 1965.
A measured volume of the wet sediment sample, of which
the dry-solids content is known, was placed in a 16 oz. pre-
scription bottle and diluted to 300 ml with distilled water.
The sample was then agitated on a mechanical shaker for 30
minutes. An aliquot of the well mixed, diluted sample was
removed for analysis. The Chemical Oxygen Demand was deter-
mined by the standard dichromate procedure as outlined in the
above reference. The results were calculated as milligrams
C per grams of dry solids.
6. Wet Weight
A measured volume of the well mixed sediment sample
was placed on a tared evaporating dish and weighed on an
analytical balance. The results were reported as grams of
sediment per milliliter of sample.
7. Dry Weight
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed.. 196£.
The resultant sample from the Wet Weight procedure was
placed in a drying oven at 103°C overnight. The sample was
removed from the drying oven, placed in a dessicator to cool
-------
6
for one hour, and weighed on an analytical balance. The result-
ant residue weight was reported as grams of sediment per railliliter
of sample.
8. Volatile Weight
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed.. 196£.
The resultant sample from the Dry Weight procedure
was placed in a muffle furnace at 600°C for one hour. The sample
was then removed from the muffle furnace, placed in a dessicator
to cool for one hour, and weighed on an analytical balance. The
resultant residue was reported as grains of sediment per milliliter
of sample.
9. Chlorophyll a
Reference: Gorham, Eville, Chlorophyll Derivatives in
Surface Muds From the English Lakes, Department of Botany,
University of Toronto, Canada.
A pre weighed sample of the sediment was shaken
mechanically for three periods of 5-10 minutes with successive
20-30 ml portions of 90$ acetone. The extracts were filtered
and the residues leached with 90$ acetone to give a final filtrate
of 100 ml. The optical density was measured at 668 mM- and 750 mp..
The concentration was calculated as Chlorophyll a in M-g/g.
-------
II STATION LOCATIONS
Station
Number
Description
Approximate Location
Depth
Feet
(6.0)
Street Bridge
Haines Point
(TA)
Bellevue
(9.7)
Woodrow Wilson Bridge
(Hunting Creek)
(11.8)
A Center of Channel
opposite buoy N "10" 20
B In shallows midway
between buoy N "10" and
Tidal Basin outlet 7
A In shallows midway
between west shore and
buoy C "1" 10
B In Channel at mid-channel
buoy R B Qk PI 25
C South Capitol St.Bridge
in Anacostia Channel
opposite mid-channel
buoy RB "N" 20
A In shallows midway between
west shore and channel k
B In Channel opposite
23' Bell 25
C In shallows midway between
23' Bell and east shore 5
A In shallows 300' from
mouth of Hunting Creek k
B In Channel off Buoy
FL R "2" 2k
C In shallows of Buoy R "2" 5
-------
Station
Number Description
6 Broad Creek A
(15-1)
B
C
Approximate Location
In shallows midway between
Buoy N"86" and west shore
In Channel south of N"86"
In Broad Creek opposite
Indian Queen Bluff
Depth
(ft.)
*
30
3
D In Broad Creek midway
between Indian Queen Bluff
and east shore
PL scataway Creek
(18.0)
8 Dogue Creek -
Marshall Hall
(22.0)
Hallowing Point
(26.0)
B
C
&
D
B
C
D
B
In shallows midway between
Sheridan Point and Buoy
# PL "77"
In Channel midway between
FL "77" and N "76"
60
In Piscataway Creek at third
point between Channel and
east edge of Bay 5
In Dogue Creek opposite
boathouse k
At mouth of Dogue Creek
300' north of Channel Buoy
# FL G "67"
In Channel opposite FL G "67" 26
In shallows midway between
FL G "67" and Marshall Hall
Cupola 17
In shallows approximately
300' off Hallowing Point
10
In center of Channel between
Hallowing Point and
Pomonkey Point 35
-------
Station
Number
9
10
11
12
13
^
0^
Description
Hallowing Point
(26.0)
Indian Head -
(29.5)
Occoquan Bay
(31.8)
Possum Point
(37.1)
Sandy Point
(40.5)
Smith Point
.^
f' ^f
^^
C
A
B
C
D
A
&
B
C
A
&
B
C
D
A
^
B
C
Approximate Location
In shallows between Pomonkey
Point and Channel
In Occoquan Bay off
Sandy Point
In Occoquan Bay off
Buoy FL "2"
In shallows north of Channel
approximately midway between
Channel and north shore
opposite Buoy N "5V
In Channel opposite
Buoy N "54"
In Channel at 1/3 points
between FL 6 11 sec. and
R nkk"
In shallows midway between
Moss Point and R 'W south
In shallows approximately
1/3 points between N"40"
and west shore
In Channel west of N "kO"
In Mallows Bay
In Aqula Creek between
^"~ Brent Point and ^:Cxrney Pt.
In Acn>^— '""Sek near
_/•— ^7 s "6"
Just north of Buoy N"2"
Depth
(ft.)
7
7
6
15
50
26
15
10 -
15
25
k
5
9
5
E
In Channel midway between
Buoy N"2" and FL "27" 16
In Channel between N"27"
and N"28"
-------
10
Station
Number
Description
Approximate Location
Depth
(ft.)
Ik Maryland Point
(52.0)
A In shallow water about
800 ft. from south shore
B In Channel southwest of
Buoy #21
C In shallow water about
800 ft. from north shore
30 -
ko
8
15 Between Stuart Point
and Nanjemoy Creek
(58.2)
A Midway between •west (south)
shore and N "11"
B In Channel just southeast
of Buoy N "11"
C In Channel north of N"10"
D In Nanjemoy Creek opposite
Blossom Point
16
16 .5 Mile North of
Route 301 Bridge
(67.0)
IT Port Tobacco River
to Mathias Point
(63.0)
In Nanjemoy Creek opposite
Kings Creek
A West of Channel midway
between Buoy FL "1" and
west shore 3
B In Channel near Buoy C"N" 60
A In Channel between Fl.
Buoy 5 and Can Buoy 3 33
B Mid-channel 8
C Off Buoy SI 8
-------
11
Station
Number
Description
Approximate Location
Depth
(ft.)
18
19
20
21
RLccowaxen Creek to
Stony Point
(75-0)
Mouth of Wicondco River
to Stratford Cliffs
(81.0)
Poplar Hill Creek to
Ragged Point Beach
B
C
A
B
C
Breton Bay to Nbmini Bay A
(88.0)
B
C
D
E
B
Between W Or N"S" and
W Or C P 10
Mid-Channel NE Fl."29" 10
Off Piccowaxen Creek
point (south) 14
Off Stratford Cliffs and
Nond.nl Cliffs 15
Near RB N in Channel 2k
Mouth of tficomico River
off Cobb Island near
IC-Stf" 13
Off Buoy N 2 13
Mid-Channel, off
Kingcopsico Point 20
Mid-Channel, off Buoy RB N 3^
Off Buoy Fl 2 16
Between Buoy N 2 and Fl 2,
mid-channel St. Clements
Bay Ik
North of Ragged Point Fl
west of BWN "51B" 8
Mid-Channel between
Buoy BW N 55 B and
Buoy BW N 51 B kk
Off mouth of Poplar Hill
Creek 17
-------
12
Station
Number
22
23
Description
St. Mary's River to
Yeocoadco River A
(104.0)
B
C
D
E
Point Lookout A
(111.0)
B
C
D
Approximate Location
Mouth of Yeocomico River
Fl 2
Between Fl 2 and
BW N 49 B
Mid- Channel between
BW N 49 B and RB Fl
M'juth of St. Mary's River
off Fl 3
St. Mary's River south of
Fl 2 Priest Point
Off mouth of Hun Creek
Mid-Channel SW of
B W N 47 B
Mid-Channel, west of Fl 4
South of Cornfield Point
Depth
(ft.)
19
31
56
28
24
16
35
44
35
-------
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UXATION MAP
-I4lh STREET BRIDGE
-HAINES POINT
-BELLEVUE
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-BROAD CREEK
-PISCATAWAY CREEK
-DOGUE CREEK
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-PORT TOBACCO
-PICCOWAXEN CREEK
-WICOMICO RIVER
SCALE M HLES
NUTRIENT DATA ON SEDIMENT SAMPLES
POTOMAC ESTUARY
APPENDIX
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Chesapeake Technical Support Laboratory-
Middle Atlantic Region
Environmental Protection Agency
Water Quality Office
1969 Data Report
Number 12
WATER QUALITY SURVEY
OF THE
HEAD OF THE CHESAPEAKE BAY
MARYLAND TRIBUTARIES
by
James W. Marks
and
Orterio Villa, Jr.
Laboratory Staff
Jean Klaczkiewicz, Chemist
Thomas E. Kleczynski, Biologist
Evelyn P. McPherson, Technician
Anna R. Favorite, Statistician
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TABLE OF CONTENTS
Page
I INTRODUCTION 1
II STATION LOCATIONS 6
III SURVEY RESULTS 7
IV MAP o o appendix i
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I INTRODUCTION
A. Purpose and Scope
During the year of 1969 the Chesapeake Technical Support
Laboratory, Middle Atlantic Region, Environmental Protection
Agency, Water Quality Office sampled the head of the bay
tributaries three times during June, July and September.
Tributaries sampled were Sassafras River, Elk River, Bohemia
River, C and D Canal, Northeast River and two points in the
upper bay. The purpose of this survey was to determine the
levels of eutrophication of the tributaries entering the
Chesapeake Bay.
B. General Remarks
The monthly surveys included analysis for Dissolved
Oxygen, Chlorophyll a. and Phaeopigments as well as nutrients.
C. Sampling Procedures
Samples were obtained using a small submersible pump
attached to a wire cable calibrated in feet. The pump was
lowered to the desired depth and allowed to run for two minutes
before receiving samples in plastic cubitainers. 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
and then fixed immediately. All samples were immediately
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2
stored on ice and analysis started upon return to the Chesapeake
Technical Support Laboratory, generally within two hours of
sampling.
D, Measured Parameters and Analytical Methods
1. Water temperature was read from a Beckman Salinometer.
2. Light extinction, in inches, was made with a 12"
(30 cm) white secchi disk.
3. The pH measurements were made with a field pH meter.
li. Conductivity was read from a calibrated Beckman
Salinometer.
5- Dissolved Oxygen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed.. 1965.
Dissolved Oxygen was determined by the azide
modification of the basic Winkler method with the titration
done potentiometrically with a Fisher automatic "titralyzer."
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 Oxidation.
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.
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3
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
optical density measured at 882 mp..
7. Inorganic Phosphorus
Reference: 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.
Inorganic Phosphorus was determined colorimetrically
as the molybdenum-blue complex with the optical density measured
at 882 mn.
8. Total Kjeldahl Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed.. 1965>.
Total Kjeldahl Nitrogen includes ammonia and organic
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,
nesslerized and determined colorimetrically.
9. Nitrate -*• Nitrite
Reference: A Practical Handbook of Seawater Analysis,
J.D.H. Strickland and T.R. Parsons, Bulletin 167, Fisheries
Research Board of Canada, Ottawa, Canada. 1968.
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h
Nitrate plus nitrite nitrogen was determined by the
cadmium reduction of nitrate to nitrite and subsequent
diazotization with sulphanilamide and N-(l-napthl)-
ethylenediamine dihydrochloride. The results were calculated
as nitrite nitrogen.
10. 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, 1969 ed., pp 137-1U3.
Ammonia nitrogen was determined by automation of the
phenol-hypochlorite procedure as described in the Southeast 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 mp. and calculated as NH-N.
11. Chlorophyll a
Reference: A Practical Handbook of Seawater Analysis,
J.D.H. Strickland and T.R. Parsons, Bulletin 16?, Fisheries
Research Board of Canada, Ottawa, Canada. 1968.
Chlorophyll a was determined by extraction of millipore-
filtered samples in 90$ acetone and read spectrophotometrically.
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12. Phae opigments
Reference: A Practical Handbook of Seawater Analysis,
J.D.H. Strickland and T.R. Parsons, Bulletin 16?, Fisheries
Research Board of Canada, Ottawa, Canada. 1968.
After Chlorophyll a had been determined the sample
was acidified with one normal HC1. The absorbancy of the
acidified sample was obtained and the percentage of Chlorophyll a
present as phaeopigments was calculated.
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II STATION LOCATIONS
STATION NUMBER STATION LOCATION
1 Sassafras River, Georgetown Bridge
2 Sassafras River, Nun 6
3 Sassafras River, Can 3
k Sassafras River, off Betterton
5 Bay, midway between Nun 2 and Bell 1
6 Bay, Turkey Point, Nun 6
7 Elk River, Nun 10
8 Bohemia River, Nun 2
9 Behemia River, above bridge
10 Elk River, Can 15
11 C and D Canal, Nun 26
12 Elk River, Nun 6
13 Elk River, Nun Ik
ill Northeast River, Nun 2
15 Northeast River, Nun 10
16 Northeast River, Nun 18
17 Northeast River, mouth of creek