20
20
15
15
10
10
5
5
0
0
-5
-5
Accumulation (cm)
Dredging
Air Temperature
-10
-10
Thermistor No. 1: 4 cm
Snow
Thermistor No. 4: 80 cm
-15
-15
5 Oct
8 Oct
11 Oct
14 Oct
17 Oct
20 Oct 1994
a. Temperature profiles and level data from basin stations.
200
14
Conductivity (mS/cm)
150
12
100
Water
10
Depth
50
pH
8
0
Salinity (/
)
6
-50
4
Water Temperature (C)
-100
2
Snow
-150
Dredging
-200
0
10 Oct
12 Oct
14 Oct
16 Oct
18 Oct 1994
b. Canoe Point Hydrolab data.
Figure 29. Data from instrumentation stations.
fall, but each problem required time, which was
DISCUSSION
not available. The primary goal for this season was
The area dredged during the 1994 field season
to deploy a dredge and remove contaminated sedi-
was much smaller than originally planned. Delays
ments from the Flats, depositing them in the re-
in procurement and setup as well as safety con-
tention basin for further treatment, and this we
cerns pushed the initiation of dredging back to
did accomplish (Fig. 30).
mid-October. Most of the problems were sur-
Dredging in an active impact area presents
mounted over the brief season at the end of the
many unique problems that can be addressed only
32
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