HEADING PAGE - port of ploce authority * welcome

ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE:56/9
By comparing the set maximum values of single contaminants in sediment
provided for dredging in the Port of Ploce under EU criteria, being still under
consideration, the implication is as follows:
- Only cadmium concentration meet the class 1
- Total oil, cooper, zinc, lead, chromium and nickel concentrations meet
the limit values for the class 2
- Mercury concentration exceeds the limit value for the class 2 by more
then 50%
The same proposal defines the limit values for PCB and PAH just for the class
3: for PCB this is 0.03 mg/kg dry weight and for PAH 1.0 mg/kg dry weight.
We have already mentioned that there is no evidence of PCB presence in
examined sediments (detection limit 0.25 µg/kg). For this parameter the PAH
concentration are lower then the limit values by two orders of magnitude.
Maximum metal concentration set in sediment of the Port of Ploce and limit
values of single contaminant and sediment class according to the Norwegian
standard and criterion being under EU consideration are given parallel in
order to have an easy reference to the shown on the Fig. 2.
It can be concluded that sediment in the Port of Ploce can be classified
in the class 2, i.e. poorly contaminated sediments. In addition, the
comparison of concentration examined hazardous substances with
reference concentrations for the Adriatic area indicates to poorly
contaminated sediment.
Sediments of such characteristics may be deposit in the sea on specifically
determined territorial sea area outside of the coastal zone, i.e. on depth
deeper then 30 m.
Estimate of Contaminant from Sediment
It is planned to use dredged material to embank quays. In respect to dredging
technology with which sediment when extracting shall be mixed with specific
water amount (app. 40 % sediment and app. 60 % water) water shall be
leached from material deposited in land. For this reason, the leaching test for
contaminants from sediment has been carried out. The surface sediment layer
PLS01, proved as the most contaminated has been selected for testing. The
leaching test has been carried out according to the standard EN 12457 for
granulated waste and sludge. Tested material has been mixed with water in
proportion 1: 10. Following parameters has been determined in water portion
of the sediment containing desorbed, dispersed and dissolved substances
from the sample of tested material: pH, electrical conductivity, phenols, and
metals: Cu, Pb, Zn, Ni, Cd, Cr and Hg.
The table 6 shows the testing results. In addition, the same Table shows limit
values for waste eluates that may, according to the Regulations on Waste
Treatment Conditions (Official Gazette No. 123/1997 and 112/2001), be
deposited in landfills and limit values for hazardous substances that may,
according to Regulations on Limit Values of Indicators of Hazardous and
Other Substances in Waste Water (Official Gazette 40/1999 and 6/2001), be
discharged into the sea.
RIJEKAPROJEKT d.o.o.