Illinois River at Valley City, IL (Agency code: 05586100)

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl   SiO2_Si
Total obs. =       219       245       102       223        80       314       179       103
Start date =  12/12/74  12/12/74  09/26/79  12/12/74  03/23/82  06/10/75  12/12/74  12/12/74
End date   =  06/22/94  06/22/94  09/15/93  06/22/94  09/15/93  06/26/92  06/22/94  08/19/93
Mx smp int days=   155       131      1381       131      1381       426       195      1381
Mean samp int=    32.7      29.2      50.5      32.1      53.1      19.9      40.1      66.9
Stdv samp int=    19.5      18.5       149      17.4       169      41.8      23.4       175
Mean conc. =      5.40      4.04     0.163     0.354     0.131     319.0      51.1      2.62
Stdev conc.=      1.89      1.79     0.249     0.142     0.045     436.6      18.2      1.01
Min conc.  =      0.94      0.18     0.000     0.020     0.020      38.0      17.0      0.17
25% conc.  =      4.00      2.60     0.040     0.260     0.110      76.0      38.0      2.01
Med. conc. =      5.50      3.80     0.080     0.320     0.130     181.3      50.0      2.71
75% conc.  =      6.70      5.40     0.170     0.410     0.150     354.0      62.0      3.27
Max conc.  =     10.00      9.30     1.500     0.950     0.270      3940     120.0      4.67

Flow summaries are in the LOADEST2 diagnostic information

TN_N    = Total Nitrogen (as N)
NOx_N   = Total Nitrate + Nitrite (as N)
NHx_N   = Dissolved Ammonia (as N)
TP_P    = Total Phosphorus (as P)
SRP_P   = Soluble Reactive Phosphorus (as P)
          (measured as Dissolved Orthophosphate) 
TSS     = Total Suspended Solids
Cl      = Dissolved Chloride (as Cl)
SiO2_Si = Dissolved Silicon (as Si)
          (Converted from original concentrations measured 
           as Dissolved Silica (as SiO2))