Table 5.  Concentrations of nutrients in samples collected at the agriculture indicator site, Medina River at LaCoste

[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,
orthophosphate, dissolved
(mg/L)

04-16-96

23

0.02    

0.01   

<0.20

0.3   

2.2      

0.03  

0.01   

0.01  
05-23-96

22

.04   

.01   

<.20

.3   

1.6      

.02  

<.010

<.010
06-24-96

35

.05   

.01   

<.20

.3   

1.5      

<.010

<.010

<.010
08-06-96

29

.02   

.01   

<.20

.3   

2         

.03  

.03   

.01
09-04-96

18

<.015

.01   

<.20

.3   

2.1      

.03  

<.010

<.010
10-07-96

29

<.015

<.010  

<.20

<.20  

3.4      

<.010

<.010

<.010
11-08-96

32

.03   

.02   

<.20

.2   

2.6      

<.010

<.010

<.010
12-06-96

24

<.015

.02   

<.20

<.20

2.6      

.06  

.02   

<.010
01-24-97

21

<.015

.01   

<.20

<.20

3.6      

.03  

<.010

<.010
03-05-97

26

.02   

<.010  

<.20

.2    

2.4      

<.010

<.010

<.010
03-21-97

25

<.015

<.010  

<.20

<.20  

2.4      

.04  

<.010

<.010
04-08-97

33

.02   

.01    

<.20

<.20  

1.8      

.01  

<.010

<.010
04-16-97

32

<.015

<.010  

<.20

.24  

1.97    

.03  

<.010

<.010
04-22-97

37

.094

<.010  

<.20

.26  

1.97    

.013 

<.010

<.010
05-02-97

33

<.015

<.010  

.2   

<.20  

1.74    

.013 

0.01

<.010
05-08-97

33

<.015

<.010   

<.20

.21  

1.71    

.024 

<.010

<.010
05-14-97

36

.021

.013   

<.20

.23  

1.24    

.026

<.010

<.010
05-21-97

32

.019

<.010   

<.20

.23  

1.49    

.032

<.010

<.010
05-27-97

33

.019

<.010   

<.20

.25  

1.56    

.027

<.010

<.010
06-03-97

32

<.015

<.010   

<.20

<.20  

1.55    

.061

.036

.01
06-17-97

46

<.015

<.010   

<.20

.28  

1.2      

.026

.019

.029
06-22-97

2,760

.063

<.010    

.23

5.8    

.577  

1.34  

.016

.016
07-03-97

1,050

.015

<.010   

.31

.3   

.417  

<.010

<.010

<.010
07-15-97

296

.03  

<.010   

<.20

.23  

.882  

<.010

<.010

.013
07-22-97

198

<.015

<.010   

.26

.26  

1.21    

.028

<.010

.013
07-30-97

102

<.015

<.010   

<.20

<.20  

1.69    

<.010

<.010

<.010
08-05-97

78

.02   

.011    

.24

<.20  

2.48    

<.010

<.010

.012
08-12-97

59

<.015

.01     

<.20

<.20  

2.99    

<.010

<.010

.015
08-19-97

54

<.015

.01       

<.20

<.20  

3.04    

<.010

<.010

<.010
08-27-97

56

<.015

.013     

<.20

<.20  

2.64    

<.010

<.010

<.010
09-03-97

54

<.015

<.010     

<.20

<.20  

2.42    

<.010

.016

<.010
09-10-97

52

<.015

<.010     

<.20

<.20  

2.51    

<.010

<.010

<.010
09-16-97

49

<.015

<.010     

<.20

<.20  

2.48    

<.010

<.010

<.010
09-24-97

54

<.015

<.010     

<.20

<.20  

2.52    

.011

<.010

<.010
10-23-97

51

<.015

<.010     

<.20

<.20  

2.7      

<.010

<.010

<.010

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
11-25-97

71

<.020

<.010

<.10

.11

1.93   

<.010

<.010

.019

12-22-97

94

<.020

<.010

.11

.15

2.59   

<.010

.013

.011

01-20-98

57

<.020

<.010

<.10

.12

2.27   

<.010

<.010

.01  

02-26-98

118

<.020

<.010

.12

.23

1.25   

<.010

<.010

.019

03-16-98

959

.037

.037

.4  

1.9  

1.38   

.466

.012

.011

03-24-98

670

.032

<.010

.11

.19

.295  

<.010

<.010

<.010

04-24-98

63

.033

.011

.12

.12

2.44   

.013

.016

<.010


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