Agreement No. CE 4/2009 (EP)
Environmental Monitoring and Audit
for Contaminated Mud Pit at Sha Chau (2009-2013) - Investigation
20th MONTHLY PROGRESS REPORT FOR CONTAMINATED MUD PITS AT SHA CHAU - February 2011
Since 1992, the East of Sha Chau area has been the site of a series of dredged contaminated mud pits (CMPs) designed to provide confined marine disposal capacity for contaminated mud arising from the HKSAR’s dredging and reclamation projects. CMP IVc is presently in operation for backfilling by contaminated mud and is anticipated to reach its capacity in 2011. A series of four newly constructed seabed pits at the East of Sha Chau area, CMP Va-d, will be provided for the disposal of contaminated mud after CMP IVc is full. Dredging operations were completed for the construction of CMP Va and are now taking place to construct CMP Vb. The environmental monitoring and audit (EM&A) programme for the CMPs at the East of Sha Chau area presently covers disposal and capping operations at CMP IV and dredging operations at CMP Vb.
This Monthly Progress Report covers the monitoring period of February 2011.
The following monitoring activities have been undertaken for CMP IV and CMP V in February 2011:
· Water Column Profiling was conducted on 9 February;
· Routine Water Quality Monitoring was conducted on 10 February;
· Water Quality Monitoring during Capping was conducted on 11 February; and
· Demersal Trawling was conducted on 16-17 February.
· Impact Water Quality Monitoring during Dredging Operations was conducted on 15 February.
A summary of field activities are presented in Annex A.
No outstanding sampling and laboratory analysis remained from February 2011.
Results of Impact Water Quality Monitoring during Dredging Operations for February 2011 are presented for CMP V. Detailed results will be discussed in the relevant Quarterly Reports.
Water Quality Monitoring during Dredging Operations of CMP V was conducted
on 15 February 2011. On the survey day, sampling was
conducted during both mid-ebb and mid-flood tides at two Reference (Upstream)
stations upstream and five Impact (Downstream) stations downstream of the
dredging operations at CMP V. Monitoring
was also conducted at the Ma Wan station.
At each station, in-situ
measurements of water quality parameters as well as water samples were taken
from three depths in the water column (ie surface:
Monitoring results are presented in Table B1 of Annex B. Levels of Dissolved Oxygen (DO), Turbidity and Total Suspended Solids (TSS) complied with the Action and Limit Levels set in the Baseline Monitoring Report (). Therefore, there appears to be no evidence of any unacceptable adverse water quality impacts arising from the dredging operations of CMP V at ESC.
Impact Water Quality Monitoring during Dredging will be undertaken for CMP V in the next monitoring month.
The sampling schedule is presented in Annex A.
A summary of the Study programme is presented in Annex C.