TABLE 3
Summary of Characteristics of Combined Sewer Overflows
Pumping Station
Date
Precipitation - inches
Overflow Volume - MG
Overflow Duration
8/10/71
0.56
145
4 hrs 25
min.
Racine Avenue
12/10/71
~2.5
769
11 hrs. 45 min.
125th Street
8/10/71
0.69
44.1
6 hrs.
12/10/71
2.53
16 hrs.
Range
Ave.
Range
Ave.
Range
Ave.
Range
Ave.
Total SS as mg/1
Volatile SS mg/1
BOD mg/1
Total-N mg/1
NH
3 -Nmg/1
Total P - mg/1
113 to 802
66 to 702
96 to 260
7.2 to 15.5
2.7 to 6.6
2.3 to 5.1
304
223
138
11.8
7.5
3.7
184 to 750
82 to 680
44 to 230
2.8 to 40.8
1.7 to 13.7
2.9 to 25.4
380
269
108
12.4
5.5
10.0
133 to 939
51 to 319
35 to 193
11.3 to 21.0
4.3 to 13.6
1.8 to 13.6
494
192
117
16.1
8.0
3.1
128 to 434
49 to 188
40 to 105
7.1 to 22.3
3.8 to 13.0
1.2 to 2.6
209
82
63
14.6
9.2
1.8
Discussion