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ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE:56/4
Dry weight content (S.T.) in analyzed samples varies from 58.6 to 73.7 %. In
addition to the sample of sediment surface layer PLS01, it is a matter also of
material with high portion of solid substance. Portion of combustible
substances (rough estimate for content of solid substancess) is the highest in
the sample PLS01 0-10 cm (24.1 %) and the lowest in the sample PLS02 30-
40 cm (11.6 %).
Differences at heavy metal concentrations in single samples are not big. The
biggest difference has been determined at zinc and chromium concentrations.
Zinc concentration varies from 72.7 to 157 mg/kg S.T.
The sediment surface layer at the station PLS01 is considerably loaded with
this metal in respect to other samples. This is probably the result of discharge
of untreated sewage being as a rule loaded with zinc into the maritime zone
between the pier 5 th and 7 th .
Chromium concentration ranges from 14.1 to 34.7 mg/kg S.T. Vertical and
horizontal distribution of this metal is something different then the zinc
distribution. The lowest value has been obtained in the surface layer PLS02
and the highest in the layer from 30 to 40 cm on the same station.
Nickel concentrations range from 30.7 to 43.4 mg/kg S.T. The distribution of
this metal is very similar to the distribution of chromium. The surface layer on
the station PLS01 contains a higher concentration then the layer being at 50 –
60 cm depth. On the station PLS02 the situation is inverse.
Mercury concentration ranges from 0.83 to 1.00 mg/kg S.T.
The sediment surface layer on both stations is more loaded with total and
mineral oils then the deeper sediment layers. The concentrations range from
28.3 to 52.0 respectively from 5.7 to 9.7 mg/kg S.T.
Polycyclic aromatic hydrocarbons are widespread sea environment
contaminants. They originate mainly from combustion process or pouring out
petroleum products. The sediment surface layer is as well when oils are in
question more loaded on both stations being an expected phenomenon. The
values obtained by this examination (20.6 do 34.9 µg/kg S.T.) are something
lower then the values obtained by examination in the year 2003 (104 – 112
µg/kg S.T.).
Presence of polychlorinated biphenyls has not been identified in any sample
as well as in the year 2003. Use of these organochlorine compounds as well
as transformer and condenser oils and specially their use in open systems i.e.
lubrication oils, colors etc. is forbidden therefore such finding has been
obtained.
Comparing the results of these examinations with results of examination
performed in the year 2003 it could be said that concentration levels of
examined metals are practically the same at both examinations. It has to be
noted that mercury examination has been not performed in the year 2003.
Sediment Pollution Estimate
Sediment Contamination Estimate Based on Comparison with Reference
Values for the Adriatic Area
Attention to problems related to quality evaluation of sediment developed
through port maintenance and its disposal has been paid in Croatia only in
recent time. Oceanographic institutes are in charge for examination of sea
sediment contamination in Croatia (Adriatic East Coast) within the Adriatic
Systematic Contamination Research Project (Project Jadran, Vir Konavle,
RIJEKAPROJEKT d.o.o.