Methodology for Sediment Quality Assessment Sample Clauses

Methodology for Sediment Quality Assessment. The management framework of dredged/excavated sediment in Hong Kong is implemented under a three-tiered approach as illustrated in Appendix A in accordance with the ETWB TC(W) No. 34/2002, which also sets out the guidelines for the assessment, sampling, testing and classification of sediment. Table 2.1 summarised the sediment quality criteria for sediment classification under ETWB TC(W) No. 34/2002. Table 2.1 Sediment quality criteria for classification of sediment under ETWB TC(W) No. 34/2002 Contaminants Lower Chemical Exceedance Level (LCEL) Upper Chemical Exceedance Level (UCEL) Metals (mg/kg dry wt.) Cadmium (Cd) 1.5 4 Chromium (Cr) 80 160 Copper (Cu) 65 110 Mercury (Hg) 0.5 1 Nickel (Ni)(1) 40 40 Lead (Pb) 75 110 Silver (Ag) 1 2 Zinc (Zn) 200 270 Metalloid (mg/kg dry wt.) Arsenic (As) 12 42 Organic-PAHs (g/kg dry wt.) Low Molecular Weight PAHs 550 3160 High Molecular Weight PAHs 1700 9600 Organic-non-PAHs (g/kg dry wt.) Total PCBs 23 180 Organometallics (g TBT/L in Interstitial water) Tributyltin (1) 0.15 0.15 Note:
Sample 1
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