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MERC+GSI – DRAFT Test Plan
5
control tank, and the second five mesocosm for water from the test tank. At each sampling time
(initial and after holding time), the designated five mesocosms will be filled to approximately
1.05 m
3
in sequence over 75 to 80 minutes of the 90 minutes required to fill or drain the ship’s
ballast tanks (i.e., sampling takes place > 80% of the time during filling or draining of tanks).
Immediately after filling of each mesocosm (< 5 minutes), physical parameters of the water will
be measured (see below), and then the precise samples volumes described below will be
collected for each biological and water quality categories by gravity draining through a bottom
valve and tubing. A table (Table 2) of samples to be collected, with corresponding volumes and
purpose can be found on page 27.
Each mesocosm has been calibrated (by filling with potable water and a flow meter) and
marked with known volumes to assure accurate sample collection. Each mesocosm will also be
rinsed thoroughly with potable water for a minimum of three times after each use and kept clean
and dry between uses.
MERC test and sampling system on the
Cape Washington
.