Agreement No. CE 4/2009 (EP)
Environmental Monitoring and Audit
for Contaminated Mud Pit at Sha Chau (2009-2013) - Investigation
12th MONTHLY
PROGRESS REPORT FOR CONTAMINATED MUD PITS AT SHA CHAU - June 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-b. 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 June 2010.
1.3
Details
of Sampling and Laboratory Testing Activities
Water Column Profiling was conducted for
CMP IVc on 22 June 2010. For CMP V, sampling for Impact Water Quality Monitoring during Dredging Operations was conducted on 9, 12, 17,
21, 23, 25, 28 and 30 June 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 in 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 IVc |
|
|
|
Sediment
Quality Monitoring |
Pit Specific
Sediment Chemistry Monitoring |
April’s sampling:
1 June 2010 |
|
CMP V |
|
|
|
Water Sampling
and Chemical Analysis |
Impact
Monitoring during Dredging Operations |
May’s sampling: 28 June 2010 |
1.4
Details
of Outstanding Sampling and / or Analysis
No outstanding sampling and laboratory analysis remained from June 2010.
1.5
Brief
Discussion of the Monitoring Results
Results of Water Column Profiling
for June 2010 are presented for CMP IV. Results
of Impact Water Quality Monitoring during
Dredging Operations for June 2010 are presented for CMP V. Detailed results will be discussed in the
relevant Quarterly Reports.
1.5.1
CMP IV
Water Column Profiling - June
2010
Results of Water Column Profiling
for June 2010 show that levels of Salinity, pH, Dissolved Oxygen (DO) and Total
Suspended Solids (TSS) compiled with the wet season WQOs at both the Upstream
and Downstream stations (Figures 1 to
4 of Annex B).
1.5.2
CMP V
Impact Water Quality Monitoring
during Dredging Operations of CMP V – June 2010
Impact
Water Quality Monitoring during Dredging Operations of CMP V was conducted for
three times per week since 9 June 2010 in this reporting month. On each 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 Figures 5 to 40 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 to
B18 of Annex B).
1.6
Activities
Scheduled for the Next Month
The following monitoring activities will be conducted in the next monthly period of July
2010:
·
Water Column Profiling and Demersal Trawling for CMP
IVc; and,
·
Impact Water Quality Monitoring during Dredging
Operations for CMP V.
The sampling schedule is presented in Annex A.
1.7
Study
Programme
A summary of the Study programme is presented in Annex C.