Agreement No. CE 4/2009 (EP)
Environmental Monitoring and Audit
for Contaminated Mud Pit at Sha Chau (2009-2013) - Investigation
10th MONTHLY
PROGRESS REPORT FOR CONTAMINATED MUD PITS AT SHA CHAU - April 2010
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 2010. 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 are now taking place to
construct CMP Va. The environmental
monitoring and audit (EM&A) programme for the CMPs at the East of Sha Chau area
presently covers disposal operations at CMP IVc and dredging operations at CMP
V.
1.2
Reporting
Period
This Monthly Progress Report
covers the monitoring period of April 2010.
1.3
Details
of Sampling and Laboratory Testing Activities
For CMP IVc, sampling for Pit
Specific Sediment Chemistry Monitoring was conducted on 21 April 2010. For
CMP V, sampling for Impact Monitoring
during Dredging Operations was conducted on 20 April 2010. 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 V |
|
|
|
Water Sampling
and Chemical Analysis |
Impact
Monitoring during Dredging Operations |
April’s sampling:
20 April 2010 |
|
|
|
|
1.4
Details
of Outstanding Sampling and / or Analysis
No outstanding sampling and laboratory analysis remained from April 2010.
1.5
Brief
Discussion of the Monitoring Results
Results of Impact Monitoring
during Dredging Operations for April 2010 are presented for CMP V. Detailed results will be discussed in the
relevant Quarterly Reports.
1.5.1
CMP V
Impact Monitoring during
Dredging Operations of CMP V – April 2010
Impact
Monitoring during Dredging Operations of CMP V was conducted on 20 April
2010. 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 were taken as well as water samples from three depths in the water
column (surface (1m below sea surface), mid-depth and bottom (1m above the
seabed)).
Monitoring results are
presented in Figures 1 to 4 of Annex B. Levels of DO, depth-average Turbidity and TSS
complied with the Action and Limit Levels set in the Baseline Monitoring Report ([1]) (Tables B1 and B2 of Annex B).
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 2010. The sampling schedule is presented in Annex A.
1.7
Study
Programme
A summary of the Study programme is presented in Annex C.