Agreement No. CE 23/2012 (EP)
Environmental Monitoring and Audit
for Contaminated Mud Pits at the South of The Brothers
and at East Sha Chau (2012-2017) -
PROGRESS REPORT FOR JANUARY 2013
Since early 1990s, contaminated
sediment () arising from
various construction works in Hong Kong has
been disposed of at a series of seabed pits at East of Sha Chau (ESC). In late 2008, a review indicated that
the existing and planned facilities at ESC would not be able to meet the
disposal demand after 2012. In
order to meet this demand, the Hong Kong Special Administrative Region
Government (HKSARG) decided to implement a new contained aquatic disposal
(CAD) () facility at the
South of The Brothers (SB CMPs) (hereafter referred to as ˇ§the Projectˇ¨) which
had been under consideration for a number of years.
The environmental acceptability of the
construction and operation of the Project had been confirmed by findings of the
associated Environmental Impact Assessment (EIA) study completed in 2005 under Agreement No. CE 12/2002(EP) (). The Director of Environmental Protection
(DEP) approved this EIA report under the Environmental Impact Assessment Ordinance
499) (EIAO) in September 2005 (EIA Register No.:
In accordance with the EIA
recommendation, prior to commencement of construction works for the SB CMPs, the
Civil Engineering and Development Department (CEDD) undertook a detailed review
and update of the EIA findings for the SB site (). Findings of the EIA review undertaken in
2009/ 2010 confirmed that the construction and operation of the SB site had been
predicted to be environmentally acceptable.
An Environmental Permit (EP-427/2011) was
issued by the Environmental Protection Department (EPD) to the CEDD, the Permit
Holder, on 3 November 2011 and varied on 23 December 2011 (EP-427/2011/A). Under the requirements of Condition 4 of
the EP (EP-427/2011/A), an
Environmental Monitoring and Audit (EM&A) programme as set out in the
EM&A Manual is required to be implemented for the SB CMPs. The present EM&A
programme undertaken under Agreement No. CE 23/2012 (EP)
covers the dredging, disposal and capping operations of the SB CMPs.
This Monthly Progress Report covers the
EM&A activities for the reporting month of January
Details of Sampling and Laboratory Testing Activities
Impact Water Quality Monitoring
during Dredging Operations of CMP 1 was
conducted three times per week (ie 3, 5, 8, 10, 12,
15, 17, 19, 21, 24, 26, 29 and 31 January 2013) in this reporting month.
No outstanding sampling and laboratory analysis remained from January
2013. A summary of field activities
are presented in Annex
data collected for SB CMPs in January 2013 will be presented in this monthly
report. Detailed discussion will be
presented in the corresponding Quarterly Report.
Impact Water Quality Monitoring during Dredging
Operations of CMP 1 ˇV January 2013
Impact Water Quality Monitoring during
Dredging Operations of CMP 1 was conducted
three times per week in a total of thirteen sampling days in January 2013. 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 1.
Monitoring was also conducted at five Sensitive Receiver Stations (Ma
Wan, Shum Shui Kok, Tai Mo To and Tai Ho Bay). A total of twelve stations were
monitored and locations of the sampling stations are shown in Figure 1.1.
results are presented in Table B1 of Annex
Levels of Dissolved Oxygen (DO), Turbidity and Suspended Solids (SS)
generally complied with the Action and Limit Levels set in the Baseline
Monitoring Report (), except on 29 January 2013 during the mid-flood tide.
On 29 January
2013, levels of SS exceeded the Action Levels at Impact Stations DS1 and DS2
during mid-flood tide.
Stations DS1 and
DS2 are located in close proximity to the works area of CMP 1. Since Action Level Exceedances of SS
were recorded at stations DS1 and DS2 and during one tidal period amongst the
13 monitoring events only, it is considered that the sediment plume was
transient and limited to the close vicinity of the works area as predicted in
the EIA review of the Project (). Hence, the
dredging works did not appear to cause any unacceptable deterioration in water
results indicated that the dredging operations at CMP 1 of SB did not appear to
cause any unacceptable deterioration in water quality during this reporting
period. Therefore, no further
mitigation measures, except for those recommended in the Environmental Permit (EP-427/2011/A), are considered necessary for the dredging operations.
Activities Scheduled for the Next Month
Impact Water Quality Monitoring
during Dredging Operations for CMP 1 will be
conducted three times per week in the next monthly period of February
2013. The sampling schedule is
presented in Annex
A summary of the
Study programme is presented in Annex C.