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
1.1
Background
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.
1.2
Reporting Period
This Monthly Progress Report
covers the monitoring period of February 2011.
1.3
Details of Sampling and
Laboratory Testing Activities
The following monitoring activities have been undertaken for CMP IV and
CMP V in February 2011:
CMP IV
·
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.
CMP V
·
Impact Water Quality Monitoring during Dredging Operations was conducted on 15
February.
A summary of field activities are
presented in Annex A.
1.4
Details of Outstanding
Sampling and / or Analysis
No outstanding sampling and laboratory analysis remained from February
2011.
1.5
Brief Discussion of the
Monitoring Results
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.
1.5.1
CMP V
Impact Water Quality Monitoring during Dredging
Operations of CMP V – February 2011
Impact
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 ([1]). Therefore,
there appears to be no evidence of any unacceptable adverse water quality
impacts arising from the dredging operations of CMP V at ESC.
1.6
Activities Scheduled for the
Next Month
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.
1.7
Study Programme
A summary of the Study programme is presented in Annex C.