Agreement No. CE 4/2009 (EP)
Environmental Monitoring and Audit
for Contaminated Mud Pit at Sha Chau
(2009-2013) - Investigation
27th MONTHLY PROGRESS REPORT FOR CONTAMINATED MUD PITS AT SHA
CHAU
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-b and are
now taking place to construct CMP Vc. 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 Vc.
1.2
Reporting Period
This Monthly Progress Report
covers the monitoring period of September 2011.
1.3
Details of Sampling and
Laboratory Testing Activities
No sampling activities are
scheduled for CMP IV in September 2011.
For CMP V, sampling for Impact Water Quality Monitoring during
Dredging Operations was conducted on
7 September 2011. A summary of field activities are presented in Annex A.
A summary of monitoring
data submitted by the Contractor in this reporting month is presented in Table 1.1.
Table 1.1 Summary
of monitoring data submitted by the Contractor during the reporting month
|
Key
Task |
Monitoring
Component |
Results Received from the Contractor |
|
CMP
IV |
|
|
|
Demersal Trawling |
Marine Biota |
July 2011
sampling: 8 September 2011 |
|
CMP V |
|
|
|
Impact
Monitoring for Dredging |
Water Quality |
August 2011
sampling: 8 September 2011 |
1.4
Details of Outstanding
Sampling and / or Analysis
No outstanding sampling and laboratory analysis remained from September
2011.
1.5
Brief Discussion of the
Monitoring Results
Results of Impact
Water Quality Monitoring during Dredging Operations of CMP V are presented
for September 2011. Detailed results
will be discussed in the 9th
Quarterly Report.
1.5.1
CMP V
Impact Water Quality Monitoring during Dredging
Operations of CMP V – September 2011
Impact
Water Quality Monitoring during Dredging Operations of CMP V was conducted
on 7 September 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) generally
complied with the Action and Limit Levels set in the Baseline Monitoring Report ([1]). Levels of
TSS and Turbidity exceeded the Action Level in the downstream station DS1
during the mid-flood tide. Station DS1
is located on the edge of the works area of CMP Vc
and the compliance of Action and Limit Levels at other downstream stations
(i.e. DS2-4) outside the works area would indicate that there is 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 Operations will be undertaken for CMP V in October 2011. No monitoring activities are scheduled for
CMP IV in the next reporting month.
The sampling schedule is presented in Annex A.
1.7
Study Programme
A summary of the Study Programme is presented in Annex C.