Table 7.  Concentrations of nutrients in samples collected at the integrator site, San Antonio River near Elmendorf

[ft3/s, cubic feet per second; mg/L, milligrams per liter; <, less than; MDL, method detection limit]

Date Dis- charge (ft3/s) Nitrogen, ammonia, dissolved (mg/L) Nitrogen, nitrite, dissolved (mg/L) Nitrogen, ammonia plus organic, dissolved (mg/L) Nitrogen, ammonia plus organic, total (mg/L) Nitrogen, nitrite plus nitrate,  dissolved (mg/L) Phos-
phorus,
total
(mg/L)		 Phos- phorus, dissolved (mg/L) Phosphorus, ortho- phosphate, dissolved (mg/L)
04-16-96 138

0.24

0.2    

0.9

1

15

2.2

1.9

1.9
05-21-96 120

  .09

.07  

  .7

  .8

16

2.9

2.6

2.6
06-27-96 292

  .11

.04  

  .7

1

  8.1

  .85

  .71

  .72
08-05-96 95

  .04

.03   

  .6

  .7

12

2.2

2.1

2
09-03-96 241

  .06

.03  

  .6

  .8

12

2

1.9

1.8
10-11-96 148

  .05

.03  

  .7

  .7

15

2

2

1.1
11-04-6 209

  .03

.04  

  .6

  .8

14

2.3

2.1

1.1
12-05-96 302

  .09

.02  

  .6

  .8

12

1.9

1.9

1.1
01-23-97 147

  .15

.17  

1

1

15

2.1

2.2

2.1
03-06-97 201

  .17

.09  

  .9

1.1

14

1.8

1.7

1.6
03-20-97 260

  .09

.07  

  .8

1

11

1.6

1.5

1.5
04-09-97 302

  .08

.04  

  .6

  .9

  9.5

2

1.9

1.1
04-23-97 222

  .229

.168

  .81

  .97

12.8

2.15

1.99

2
04-26-97 2,750

  .138

.03  

  .37

2.8

  2.44

1.36

  .37

  .4
05-06-97 186

  .125

.101

  .67

  .85

12.2

2.17

2.03

2.01
05-22-97 315

  .05

.03  

  .52

  .95

  7.92

   .885

.72

  .72
06-02-97 197

  .032

.078

  .55

  .74

  9.48

 1.11

1.08

1
06-21-97 4,850

  .054

.059

  .28

1.1

  1.84

    .536

  .49

  .27
07-14-97 856

  .044

.026

<.20

  .44

  4.48

    .522

  .42

  .42
07-30-97 365

  .083

.063

  .55

  .62

  7.63

  1.23

1.13

  .96
08-14-97 180

  .043

.036

  .56

  .74

  1.7

  1.54

1.44

1.38
08-21-97 135

  .023

.046

  .51

  .62

  1.6

  1.5

1.35

1.33
09-11-97 299

  .084

.151

  .59

  .81

10.5

  1.6

1.51

1.34
09-17-97 142

  .031

.049

  .63

  .7

11.4

  1.92

1.79

1.66
10-08-97 1,110

  .03

.035

  .48

1.3

  4.9

    .935

  .57

  .54
10-22-97 324

  .084

.074

  .47

  .53

  9.77

  1.7

1.62

1.62
Change in MDL for nitrogen, ammonia, dissolved; nitrogen, ammonia plus organic, dissolved; and nitrogen, ammonia plus organic, total for the following analyses; see table 4
11-19-97 318

<.020

.021

  .55

  .59

10.8

  1.63

1.7

1.58
12-17-97 212

<.020

.062

  .65

  .75

11.8

  2

1.99

1.74
12-20-97 1,250

<.020

.035

  .37

3.7

  3.04

  1.5

  .36

  .35
01-06-98 1,050

  .124

.043

  .57

  .78

  3.37

    .497

  .46

  .45
01-22-98 265

  .021

.036

  .52

  .62

10.8

  1.54

1.47

1.4
01-31-98 1,270

  .03

.013

  .35

1.2

  2.88

    .608

  .34

  .37
02-19-98 462

  .125

.045

  .67

  .91

  6.97

    .888

  .81

  .77
02-21-98 1,080

  .127

.018

  .35

1.7

  3

    .776

  .38

  .34
03-16-98 1,360

  .129

.069

  .4

3.1

  2.31

  1.26

  .27

  .27
03-26-98 812

  .041

.037

  .24

  .55

  3.91

    .492

  .4

  .38
04-28-98 218

  .369

.108

  .98

1.1

11.3

  1.81

1.73

1.76

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