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polycarbonate pipe
In September 1996, 9 piston cores were acquired from the vessel
G. K. Gilbert along the Lake Maurepas tidal delta and the southern
edge of Lake Pontchartrain (Figure 13). The cores were taken with
a modified push corer that could be operated over the side of
the boat and was capable of retrieving 1 meter long cores. The
following year, 26 cores were obtained throughout Lake Pontchartrain
using a 0.1m2 x 1m box corer. The top 8cm of each core was subsampled
2-3 times with 1 foot long, 4 inch diameter polycarbonate core
liners.
In June 1998 over 70 box cores were acquired from Lake Pontchartrain.
Thirty of the box cores reoccupied sites from the previous year
and were subsampled in a similar fashion. Sixteen of the box cores
were taken from sites previously sampled with the underway surficial
sediment sampling method described below. At these sites three
box cores were acquired per site and each core was subsampled
using the 4 inch core liners in 2cm intervals down to 10cm. The
remaining 24 box cores were subsampled in a similar fashion, except
sampling proceeded down to 16cm. These cores where acquired from
areas interpreted to have high concentrations of trace metals
in the sediments, based on previous sediment surveys. Dredge pits
along the southern shore of the lake were also targeted. The samples
were frozen to retain organic carbon.
In addition to sampling with the foot long core liners, up to
one meter long subsamples were taken from 16 of the box cores
using 4 inch diameter, meter long pvc pipe that was pushed into
the sediment, capped and retrieved. These subcores were split
into two halves along core, one half was stored whole, the other
half was subsampled as described in the methods section below.
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