Settling-test data, Sample 2A from Ashtabula Harbor, Ohio
Before
settling
Remaining
after 1 h of
settling
Remaining
after 4 h of
settling
Remaining
after 18 h of
settling
Remaining
after 40 h of
settling
Suspended
solids, mg/L
599,510 480
—
290
—
Turbidity,
JTU
a
87,500
500
—
150
39
Total phosphorus, mg/L
8.0
0.03
0.09
0.05
0.10
Surfactants,
mg/L
—
0.06
—
—
—
Sediment, ml/L —
600
—
—
—
Kjeldahl nitrogen, mg/L
259
—
29.0
25.1
25.6
Oil and grease,
mg/L
565
<1.00
—
nil < 1
nil < 1
Iron, mg/L
10,500
41.00
—
—
—
Chromium,
mg/L
60
0.50
0.045
0.020
0.020
Cadmium,
mg/L
<0.6
0.04
0.055
0.020
0.022
Zinc, mg/L
90
1.1
0.170
0.095
0.075
Manganese,
mg/L
270
3.10
—
0.021
0.0187
Copper, mg/L
8.0
0.12
0.055
0.040
0.020
Nickel, mg/L
<6.0
—
—
<0.015
—
Chlorides,
mg/L
—
25.0
—
—
—
a JTU Jackson Turbidity Unit
Appendix C
Settling-test data, Sample 4F from Fairport Harbor, Ohio (analyzed by Calspan Corporation,
Buffalo, NY)
Before
settling
Remaining
after 1 h of
settling
Remaining
after 4 h of
settling
Remaining
after 18 h of
settling
Remaining
after 40 h of
settling
Chemical oxygen demand,
mg/L
14,540
202
133
97
101
Total solids,
mg/L
363,000 4,240
—
2,712
2,460
2,140
2,140
2,140
2,140
2,140
(continued)
7 Lake Restoration
309