35-
30     .   ................................................................        ...............................................     .................................... .............................
Maximum
Standard
25     .  .....................................     ....     .................                     ..........  ...........................   ...     ..........  .........
........................
2o     4  ........................................................................................................................................................ ..............................

12-
lo    l .................................     .................................................................................................................................................

2     '    ,                      i           i           i           i          i          i           i           i          i           v           i           p
1976                                          1980                                                       1985                                                      1 9 0
Year
0.006-
0   .00      5    . ........................................................................................                ...............................................................................
t
i t
0   .00      4    . .................................... ................................................. j .... L ................................                    ........................................
0   .00      3    1 ............................        ....................... ...........               ......... r:.. it      L ...................       ...............           ...........................

,)-L

15         '     ,             g                                         a                                        I            I                                                                   I                           I            1             1
1976                                                   1980                                                                 145                                                                 1990
Year
9.5-
A               ...............................................................................................................................
..........       .......................................

................................................................................................................... N                   -..- ....................
Maximum
Standard
a,., lop
....................................             ..................     ...... ...    .. ...........    . ...... .       .......       ......
..    .  ..........     ....... .                                                            ............................
........     .....
Minimum
................................................................................................................................                        ...........       S   ta    n   d   a   rd

5. 5
1976        1980           1985           1990
Year
0. E;

2   5    .   ...............................................................                                   ............ ....                    ............ ........ ......... .................                    ..............
2   0    .   ......................................................................................                                  ..........      .................................................................
t
t
1   5    .   ................................................................. ..........................                                  ...   ..    ............. .................................................
1   0    .   ............................................ ...................... ............... ...                               ...... ..... .       ...................... ........ ........... ..................
Maximum
Standard
5    .   ..........................           ............... ............                 ........... ....... ;        ...................           .............................................................
..........
0
1076                                              1980                                                          1985                                                          1990
Year
Note: The maximum standard of 200/400 colonies per
100 ml was violated in all years.

0 .1                  ----------
0'

0
a)
co
E
a)

t
t
.................................      .....   ..................      .......................               ................................................................................
t
. t
t
................................................ . ........ .    .......   ..j ...   .............................    .........
.................................
.................................      ....................    .................................................... v                ...................
Minimum Standard

8-
6-
41

du -

0 W.W--
E
0.002-
0.001-

7.5.
6.g.

..................................................................................  .  ........... .  ...........  ...........................  ...........................
..............................................................................                                  .................................................

19 6        19'80         ' 19'85
Year

1990

Note: The maximum standard of 0.04 mg/l was not violated in any year.
35,                                               1

30

0.5.
0.12 -

...........  ....................................................        .....................    .............................  .......................  ...............  ..........
..........................................   ..........  ..........................  ..........................................................  .............................
....................................................................................... .    .............................. ................... . . ... .............................
Maximum
Standard
..................................   ...............................................    .......................................                          ............................

E
0
:3
0
-C
0-
cn
0
0

1076        1980           1985
Year

1  1
1990

80

Figure IV-1
WATER QUALIT"Y DATA FOR THE DES PLAINES RIVER
AT %.:.')TATION Dp-4:1976-1993