Mississippi River at Lock and Dam 2 (Agency code: UM-815) 

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P       TSS        Cl   
Total obs. =        98       125       219       200       202       104
Start date =  11/03/83  08/05/76  05/25/60  05/15/58  05/25/60  05/25/60
End date   =  09/15/94  06/15/98  06/15/98  09/15/94  09/15/94  03/16/77
Mx smp int days=   154      2423      2423      2423      2423      1140
Mean samp int=    40.9      64.4      63.8      66.7      62.3      59.6
Stdv samp int=    23.1       220       187       207       191       126
Mean conc. =      4.22      2.36     0.499     0.345      44.5      20.7
Stdev conc.=      2.01      1.82     0.555     0.225      56.6      13.2
Min conc.  =      1.64      0.22     0.020     0.010       0.5       3.0
25% conc.  =      2.88      1.00     0.150     0.240      20.0      13.0
Med. conc. =      3.50      1.80     0.300     0.308      35.5      18.0
75% conc.  =      5.10      3.10     0.670     0.395      55.0      24.0
Max conc.  =     11.71      8.10     3.600     2.520     690.0      67.0

Flow summaries are in the LOADEST2 diagnostic information

TN_N    = Total Nitrogen (as N)
          (Total Kjeldahl Nitrogen + Nitrate + Nitrite)
NOx_N   = Nitrate + Nitrite (as N)
NHx_N   = Total Ammonia (as N)
TP_P    = Total Phosphorus (as P)
TSS     = Total Suspended Solids
Cl      = Total Chloride (as Cl)