Table 6.1       Sediment Quality Classification Criteria

 

Contaminants

LCEL

UCEL

Heavy Metal (mg/kg dry weight)

Cadmium (Cd)

1.5

4

Chromium (Cr)

80

160

Copper (Cu)

65

110

Mercury (Hg)

0.5

1

Nickel (Ni)

40

40

Lead (Pb)

75

110

Silver (Ag)

1

2

Zinc (Zn)

200

270

Metalloid (mg/kg dry weight)

Arsenic

12

42

Organic-PAHs (µg/kg dry weight)

PAHs (Low Molecular Weight)

550

3160

PAHs (High Molecular Weight)

1700

9600

Organic-non-PAHs (µg/kg dry weight)

Total PCBs

23

180

Source:     Appendix A of ETWB TCW No. 34/2002 Management of Dredged / Excavated Sediment

Note:         LCEL –              Lower Chemical Exceedance Level

                                 UCEL –             Upper Chemical Exceedance Level