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
Dissolved
solids, mg/L
Suspended
Solids, mg/L
360,860 2,130
—
672
320
Turbidity,
JTU
a
155,000 780
—
195
52
Total phosphorus, mg/L
10
0.280
—
0.58
0.16
Surfactants,
mg/L
—
0.06
—
—
—
Sediment, ml/L —
700
—
—
—
Kjeldahl nitrogen, mg/L
696
56.5
—
38.2
—
Oil and grease,
mg/L
1,865
4
—
<10
<10
Iron, mg/L
6,500
22.5
—
—
—
Chromium,
mg/L
73
0.20
—
0.040
0.035
Cadmium,
mg/L
<0.4
0.03
0.052
0.051
0.048
Zinc, mg/L
29
0.15
0.099
0.025
0.025
Manganese,
mg/L
145
2.20
—
0.021
0.019
Copper, mg/L
11
0.07
—
0.060
0.070
Nickel, mg/L
<3.6
—
—
<0.015
—
Chlorides,
mg/L
—
284
—
—
—
a JTU Jackson Turbidity Unit
Appendix D
Dredging supernatant water quality versus US drinking water standards
Parameters
Water quality after 18 h of settling
(mg/L)
Proposed federal drinking water
standards (mg/L)
Sample 2A
Ashtabula
Sample 4F
Fairport
Oil and
grease
nil < l
<10
absent
(continued)
310
L. K. Wang et al.