Agreement No. CE 4/2009 (EP)
Environmental Monitoring and Audit
for Contaminated Mud Pit at Sha Chau
(2009-2013) - Investigation
22nd MONTHLY PROGRESS REPORT FOR CONTAMINATED MUD PITS AT SHA
CHAU (for APRIL 2011)
June 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 April 2011.
1.3
Details of Sampling and
Laboratory Testing Activities
For CMP IVc, sampling for Pit Specific Sediment Chemistry Monitoring was conducted on 11
April 2011. For CMP V, sampling for Impact
Monitoring during Dredging Operations was conducted on 12 April
2011. A summary of field activities are
presented in Annex A.
A summary of laboratory analysis results submitted by the Contractor in
this reporting month is presented on Table
1.1.
Table 1.1 Summary
of laboratory analysis results submitted by the Contractor during the reporting
month
|
Key Task |
Monitoring Component |
Results Received from the Contractor |
|
CMP IV |
|
|
|
Biomonitoring of Contaminants |
Marine Biota |
December 2010, January 2011 and February 2011 sampling: 11 April 2011 |
|
CMP V |
|
|
|
Impact
Monitoring during Dredging Operations |
Water Quality |
March’s sampling: 19 April 2011 |
1.4
Details of Outstanding
Sampling and / or Analysis
No outstanding sampling and laboratory analysis remained from April 2011.
1.5
Brief Discussion of the
Monitoring Results
Results of Impact
Monitoring during Dredging Operations for April 2011 are presented for CMP
V. Detailed results will be discussed in
the 8th Quarterly Report. Results of Biomonitoring
of Contaminants will also be discussed in the 8th Quarterly Report.
1.5.1
CMP V
Impact Water Quality Monitoring during Dredging
Operations of CMP V – April 2011
Impact
Water Quality Monitoring during Dredging Operations of CMP V was conducted
on 12 April 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: 1
m below sea surface, mid-depth and bottom: 1 m above the seabed).
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
No monitoring activity will be conducted for
CMP IVc. Impact Monitoring during Dredging Operations for CMP V are scheduled in the next monthly period of May 2011.
The sampling schedule is presented in Annex A.
1.7
Study Programme
A summary of the Study programme is presented in Annex C.