Document ID: EPA-HQ-OW-2003-0079-0025
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2003-11-18T05:00Z

D­
40
Appendix
D­
6.
Water
Composition
of
St.
Louis
River,
MN,
from
USGS
NASQAN
and
Select
Relationships
to
Water
Hardness
Date
pH
Hardness
Alkalinity
Ca
Mg
Na
K
Cl
SO4
NO3
DOC
19730222
6.8
68
53
17
6.3
11
1.6
14
14
0.19
19730503
7.1
58
46
14
5.5
6.6
1.1
9.5
13
0.17
19730816
6.9
70
51
17
6.6
7.6
1.2
9
20
0.01
19731128
7
65
48
16
6.1
7.5
1.3
8.8
14
19740221
7
64
48
16
5.8
8.9
1.3
12
14
19740516
6.9
45
32
11
4.3
3.5
1.2
3.8
11
19740919
88
60
21
8.6
12
1.8
17
23
19741030
7.3
83
62
23
6.3
13
1.3
16
23
19741209
7.4
86
62
22
7.6
12
1.6
15
18
19750121
7.3
74
66
18
7
10
1.1
12
13
19750303
7.3
74
68
17
7.6
10
1.7
11
12
19750407
7.2
95
80
22
9.7
11
2
14
16
19750527
7.5
63
50
15
6.1
8.5
1.5
9.2
12
19750708
9.2
58
43
14
5.7
3.2
1
3.4
10
19750818
7.2
73
56
18
6.9
12
1.3
16
16
19750929
7.4
90
72
23
8
12
1.5
13
20
19751110
7.1
90
63
22
8.4
12
1.7
15
24
19751216
7.6
87
61
22
7.8
14
1.6
16
28
19760209
7.5
72
59
18
6.6
13
1.6
13
18
19760322
7.7
78
65
19
7.4
12
1.4
11
17
19760503
7.6
59
43
14
5.8
7.9
1.3
8.6
15
19760614
7.5
94
75
22
9.4
16
1.9
20
20
19760726
7.4
93
80
22
9.3
21
1.9
25
24
19760908
7.5
82
78
18
9.1
17
2.5
9.3
26
19761019
7.5
83
72
20
8.1
21
1.6
24
21
19761129
7.4
95
74
22
9.7
25
1.8
32
24
19770110
7.3
85
88
20
8.4
17
1.5
15
19
19770214
8.2
82
73
20
7.8
18
1.7
26
17
19770404
7.3
87
67
21
8.5
20
2.4
28
24
19770516
7.3
120
98
29
11
30
2.8
26
36
19770628
7.8
100
75
24
9.9
13
2
16
23
19770808
7.4
110
90
26
10
27
2.2
32
28
19770919
7.4
73
44
17
7.3
6.6
1.7
8.9
17
19771031
7.6
64
47
15
6.5
7.9
1.3
9.7
22
37
19771212
7.5
65
50
15
6.8
6.3
1.2
7.1
16
19780123
7.3
71
52
17
6.9
12
1.5
9.4
18
19780306
7.2
67
48
16
6.5
8.8
1.2
17
16
32
19780417
7.5
43
28
10
4.3
4.2
1.8
5.7
15
19780530
7.9
64
54
15
6.4
5.7
1.5
7.1
14
33
19780710
7.4
53
44
13
5.1
4.3
1.3
5.3
8.9
19780821
8.4
60
42
15
5.5
5.3
1.5
6.5
12
36
19781002
7.7
71
57
17
6.9
8.2
1.1
9.6
15
24
19781115
7.4
68
52
16
6.8
11
1.1
10
12
19781218
7.4
68
55
16
6.9
11
1
9.2
14
19790205
7.4
63
57
15
6.3
3.4
1
3.1
8
12
Date
pH
Hardness
Alkalinity
Ca
Mg
Na
K
Cl
SO4
NO3
DOC
D­
41
19790329
7.6
80
63
19
8
8.4
2.3
7.8
13
19790430
7.6
37
29
8.7
3.7
2.2
1.3
2.8
8.9
20
19790611
7.2
47
34
11
4.8
3.1
0.8
2.8
9.4
19790723
7.6
73
55
17
7.3
3.9
0.9
3.7
8.9
30
19790827
7.2
19791015
8.1
74
54
16
8.2
5
1.1
3.9
13
0.01
12
19791126
7.8
61
52
14
6.3
3.8
0.9
3.6
11
0.37
19800121
7.6
60
53
14
6
3.8
0.9
3.2
9.9
0.15
19800219
7.4
63
51
15
6.2
3.9
0.8
2.9
9.2
0.19
17
19800331
8.4
68
64
16
6.9
4.2
1.1
3.5
9.2
0.3
19800602
8.3
84
72
19
8.8
6.4
1.2
5
15
0.01
21
19800630
8.3
93
68
21
9.9
7.9
1.4
6.7
24
0.02
19800804
8.1
130
110
28
14
10
1.9
11
24
0.01
13
19800902
7.8
110
82
24
11
7.2
1.7
7.6
18
0.01
19800929
7.6
73
54
16
8.1
5.7
1.4
5.8
14
0.12
19801103
7
82
58
18
8.9
5.6
1.3
6.9
18
0.19
23
19801208
67
50
15
7.2
4.6
1
4.1
11
0.19
19810105
7.6
70
55
16
7.2
4.2
1.1
4.1
13
0.23
19810209
7.5
68
58
16
6.9
4.9
1
3.5
8.1
0.27
14
19810309
7.7
61
57
14
6.2
5.2
1.8
5.1
8.6
0.36
19810504
7.3
42
40
9.6
4.3
3.7
1.2
3.6
9.6
0.18
21
19810706
7.4
51
39
12
5
3.5
1.2
3.2
7.5
0.14
10
19810908
7.9
73
64
16
8
4.2
0.8
4.2
8.3
0.11
19811020
7.6
51
37
12
5.2
4.3
1.2
4.2
8.9
0.31
19820113
62
52
14
6.5
4
0.9
3.7
9.3
0.24
19820309
7.4
66
58
15
7
5.3
1
3.8
11
0.36
19820420
7.2
32
25
7.5
3.3
2.1
1.3
2.3
6
0.19
19820621
7.9
61
55
14
6.4
4.3
1.1
4
10
0.1
19820809
7.4
66
54
15
6.9
3.9
0.6
3.5
9
0.25
19821004
8
73
63
15
8.7
4.9
1
4.7
13
0.11
19821207
7.3
55
43
12
6.1
4.2
0.8
3.3
16
0.24
19830131
6.9
62
50
14
6.5
4.1
0.8
3.5
15
0.36
19830328
7.5
68
56
15
7.3
4.5
1.2
4.1
15
0.35
19830523
8.2
68
53
15
7.5
4
1.3
0.8
23
0.12
19830718
7.6
67
53
15
7.2
3.7
1.3
3.7
22
0.15
19831031
7.7
64
48
14
7
3.9
1.2
3.5
24
0.12
19840109
7.4
57
50
13
6
3.6
0.9
3.4
13
0.23
19840306
7.1
66
57
15
7
4.4
0.9
5.2
8.7
0.31
19840424
7.2
51
39
11
5.6
3.1
1.4
3.2
14
0.12
19840619
9.5
52
39
12
5.3
2.9
0.8
3.6
10
0.13
19840822
6.4
70
58
15
7.9
4.7
1
3.8
17
0.1
19841009
7.6
73
16
7.9
4.6
1
3.7
15
0.1
19841120
7.1
64
14
7.1
3.9
0.9
3.7
14
0.24
19850211
7
69
15
7.7
4.6
1.1
4
11
0.27
19850325
7.3
61
13
7
5.6
2.5
6.6
16
0.31
19850506
7.4
55
12
6
3.6
1.7
4.2
14
0.15
19850730
7.6
62
14
6.6
3.2
0.9
4
9.8
0.1
19851021
7.5
58
12
6.8
3.7
1.1
0.2
12
0.13
Date
pH
Hardness
Alkalinity
Ca
Mg
Na
K
Cl
SO4
NO3
DOC
D­
42
19851203
7.4
73
16
8
4
1
4.2
18
0.16
19860303
7.4
66
15
7
4
1
3.4
10
0.24
19860407
7.3
0.19
19860602
7.5
58
13
6.3
3.5
1
2.8
15
0.1
19860818
7.9
74
15
8.9
4.6
1.2
3.7
24
0.1
19861112
7.5
55
12
6
3.4
1.4
3.8
19
0.27
19861210
7.3
70
57
13
9
5
1
4.8
21
0.16
19870218
7
66
15
6.8
3.7
0.9
3.1
12
0.24
19870518
8
83
18
9.3
5.8
1.2
5
10
0.1
19870622
7.8
75
16
8.5
6.2
1.1
5.2
19
0.1
19870721
7.6
51
12
5.2
2.8
1.3
3.1
15
0.1
19871028
8
82
17
9.6
6.8
1.4
1.3
19
0.1
19871208
7.9
69
15
7.7
5.3
1.4
4.8
17
0.1
19880119
7.4
73
16
8
5.1
1
3.6
15
0.15
19880223
7.4
85
19
9.2
6.5
8.5
5.1
16
0.2
19880412
7.4
42
9.2
4.7
3
2.8
5
20
0.25
19880907
7.1
70
15
8
5.3
1.5
6.1
18
0.15
19881031
7.6
100
21
12
9
1.9
7.8
27
0.1
19881130
7.6
78
17
8.6
5.5
1.3
5.5
19
0.19
19890221
7.1
77
17
8.4
6.3
1.3
4.4
17
0.25
19890410
7.2
48
11
5
4.9
1.8
8.1
8
0.37
19890626
7.4
63
14
6.8
4.6
1.1
5
12
0.15
19890814
8.1
95
20
11
9.1
1.5
8.9
18
0.1
19891101
8.1
110
20
15
7.8
1.9
6.3
31
0.1
19891218
7.5
88
17
11
6.1
1.4
5
22
0.16
19900123
7.3
100
18
14
7.2
1.7
5.2
28
0.23
19900416
7.5
62
13
7.2
5.1
1.9
5.4
14
0.2
19900716
7.7
70
15
8
5.7
1.3
5.4
11
0.2
19900820
8.1
95
20
11
7.8
1.5
7.9
20
0.1
19901009
7.3
81
18
8.7
5.4
1.5
5.7
13
0.1
19910102
7.4
83
19
8.7
5.3
1.4
5
12
0.2
19910212
7.1
80
18
8.5
6.8
1.3
3.9
11
0.2
19910502
6.7
56
13
5.8
4
1
3.7
7.9
0.1
19910610
7.3
64
15
6.5
4
0.7
4.1
6.9
0.12
19910731
7.8
55
13
5.4
2.5
1
2.6
3.8
0.05
19910801
7.3
19911003
7.8
67
15
7.1
4.4
1
4.4
9.6
0.068
19911204
7.4
61
13
6.9
4.8
1
3.5
7
0.18
19920113
7.9
67
15
7.2
4.3
1.1
3.2
9.3
0.21
19920413
7.7
30
7.8
2.5
2.5
0.3
2.4
4.8
0.16
19920722
7.6
71
16
7.5
4.8
0.9
2.1
9.6
0.11
19921026
8.2
86
18
10
5.3
1.2
5.4
14
19921216
7.6
89
19
10
6
1.2
5.6
13
0.25
19930201
7.2
83
18
9.1
7.3
1.2
7.3
12
0.28
19930426
7.7
66
15
6.8
4.1
1.2
4.9
9.5
0.092
19930722
7.5
64
15
6.5
4
0.2
3.9
7.7
0.079
19931201
7.7
80
17
9
4.8
1
4
11
0.16
Date
pH
Hardness
Alkalinity
Ca
Mg
Na
K
Cl
SO4
NO3
DOC
D­
43
19940216
7.3
19940511
7.7
51
11
5.6
3.7
1.1
3.4
9.4
0.076
MIN
6.4
30
25
7.5
2.5
2.1
0.2
0.2
3.8
0.01
10
MAX
9.5
130
110
29
15
30
8.5
32
36
0.37
37
MEAN
7.52
71.11
56.94
16.16
7.46
7.09
1.37
7.39
15.04
0.17
22.19
D­
44
1977
y
=
0.0791x
+
1.5586
R2
=
0.9814
0
5
10
15
50
70
90
110
130
Hardness
Mg
1977
y
=
0.2486x
­
0.9304
R2
=
0.9962
0
10
20
30
40
50
70
90
110
130
Hardness
Ca
1977
y
=
0.3951x
­
18.303
R2
=
0.7937
0
10
20
30
40
50
70
90
110
130
Hardness
Na
D­
45
1977
y
=
0.0237x
­
0.2069
R2
=
0.7611
0
1
2
3
50
70
90
110
130
Hardness
K
1977
y
=
0.3578x
­
12.5
R2
=
0.5509
0
10
20
30
40
50
70
90
110
130
Hardness
Cl
1977
y
=
0.2793x
­
1.9496
R2
=
0.7145
0
10
20
30
40
50
70
90
110
130
Hardness
SO4