Appendix 5.1 – Figure 1 HISTORICAL WATER / SEDIMENT QUALITY MONITORING LOCATIONS

APPENDIX 5.1 Historical Water / Sediment Quality Monitoring Locations & Results

Surface Sediment Quality Measured at Peng Chau

	Units	Lower Chemical Exceedance Level (LCEL)^D	Upper Chemical Exceedance Level (UCEL)^D	PC1*	PC2*
PH Value		-	-	8.7	8.5
Moisture Content	%	-	-	57.4	65.6
Cadmium	mg/kg	1.5	4	0.05	0.09
Chromium	mg/kg	80	160	30	32.5
Copper	mg/kg	65	110	29.3	42.6
Nickel	mg/kg	40	40	17.3	19.5
Lead	mg/kg	75	110	38	48.7
Zinc	mg/kg	200	270	85	104
Mercury	mg/kg	0.5	1	0.14	0.2
Ammonia as N	mg/kg	-	-	100	<40
Total Phosphorus	mg/kg	-	-	354	594
Total Organic Carbon	mg/kg	-	-	1.1	1.2
Total Inorganic Carbon	%	-	-	2.5	<0.2
Total Carbon	%	-	-	3.4	1.3
Chemical Oxygen Demand	%	-	-	15500	32300
Overall Sediment Classification		-	-	L	L

Note: ^D Sediment Quality Criteria extracted from ETWB TCW No. 34/2002 Appendix A. Criteria Limits have only been shown for those parameters sampled for by CES (Asia) Ltd.

* Results extracted from Outlying Island… CES (Asia) Ltd for Drainage Services Department (1997).