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MERC ER01-12
18
Particulate Organic Carbon
(POC) content of challenge water during uptake. Ambient describes
natural conditions of water in the Port of Baltimore. Control and treated show levels in test
waters from time-integrated samples collected through the entire uptake.
Mean (mg/l)
SD
Ambient
7.88
0.17
Control
10.6
0.09
Treated
8.9
0.48
UV Transmittance
(UVT) percentages for challenge water during uptake and discharge.
Ambient describes natural conditions of water in the Port of Baltimore and T0, T1, and T2 for
challenge water are %UVT values from three sample time points (beginning, middle, and end of
uptake).
Uptake
Mean %UVT
SD
Ambient
78.1
0.25
T0 challenge water
77.9
0.80
T1 challenge water
79.4
0.63
T2 challenge water
77.1
0.25
Discharge
Control Mean
%UVT
SD
Treated
Mean %UVT
SD
T0 challenge water
78.6
0.38
79.1
0.42
T1 challenge water
79.1
0.23
79.8
0.06
T2 challenge water
78.9
0.12
79.8
0.17
Active Chlorophyll –
Control and treated show chlorophyll levels in test waters from time-
integrated samples collected through the entire uptake and discharge.
Live Organisms >50 µm –
Significant numbers of organisms in the control and treated water on
discharge were dead, most likely due to significant drops in dissolved oxygen level (see values
above). The organism in the size category included: Calanoida, cyclopoida, harpactiocoida,
copepod nauplii, polychaeta, barnacle nauplii, medusa, rotifer, eggs, turbellaria, and large
diatoms.
Uptake
Mean µg/l
Uptake
SD
Discharge
Mean µg/l
Discharge
SD
Control
185.0
3.72
45.2
0.77
Treated
184.8
1.68
28.4
0.89
Uptake
Mean/m
3
Uptake
SD
Discharge
Mean/m
3
Discharge
SD
Control
470,147
13,908
55
0
Treated
301,459
18,760
10
0