6. DISPOSAL OF MARINE SEDIMENT EXTRACTED FROM BORED PILING WORKS
6.1 Background
6.1.1 After the acceptance of the review of the approved Sediment Quality Report (SQR) for this Project under EPD letter dated 19 August 2015, an approval to dispose the marine sediment extracted from bored piling for this Project was then approved under memo from Secretary, Marine Fill Committee of CEDD dated 20 August 2015 for the disposal of marine sediment extracted from bored piling works. The disposal site allocated to this Project is the Mud Pit CMP Vd of the Confined Marine Sediment Disposal Facility to the East of Sha Chau (ESC) during this reporting period.
6.1.2 No extracted marine sediment was treated using cement solidification/stabilisation (Cement S/S) techniques under Contract No. HY/2013/03 during this reporting period. The marine sediment extracted from this Contract was disposed to the MFC allocated disposal sites directly without treatment during this reporting period. As a practical means, the disposal operation is managed by one contractor who is also responsible for applying dumping permit and its subsequent extension applications from EPD. Contract No. HY/2013/03 has been assigned to coordinate and arrange for disposal of extracted marine sediment from all three Contracts (Contract Nos. HY/2013/02, HY/2013/03 and HY/2013/04).
6.2 Dumping Arrangements
6.2.1 The barge for disposal of marine sediment was morn at the temporary loading and unloading at the east shore of the HKBCF Island, which has been being used by reclamation contractor (Contract No. HY/2010/02) for reclamation activities. In terms of safety consideration and to avoid mixing of sediment between contracts, each dumping date was allocated to one Contract. The quantity of marine sediment disposed on each date was from one Contract.
6.2.2 During dumping, Contractor of Contract No. HY/2013/03 is responsible for transporting the marine sediment from the site area of Contract No. HY/2013/03 to the barge. The estimated quantity of marine sediment in each truck is confirmed by Resident Site Staff of Contract Nos. HY/2013/02, HY/2013/03 and HY/2013/04. The trip tickets for transportation and disposal of marine sediment are collected and checked. Contract No. HY/2013/03 as the dumping permit holder is responsible for reporting to EPD the quantity disposed of as the condition stipulated in the dumping permit. The disposal site allocated to this Project is the Mud Pit CMP Vd of the Confined Marine Sediment Disposal Facility to the East of Sha Chau (ESC) during this reporting period.
6.3 Quantity Disposed
6.3.1 No marine sediment extracted from bored piling from this Contract was disposed to allocated dumping site in September 2017. As confirmed by RSS, all marine sediments extracted from HY/2013/02, HY/2013/03 and HY/2013/04 have been completed with the last batch disposal on 30 August 2017. The total disposed quantity up to the last batch is 114.088 (in‘000m3). The summary of marine sediment disposed up to end August 2017 is shown in the following table:
Table 6.1 Summary of Marine Sediment Disposed to Dumping Site
|
Month/Year |
Quantity disposed (in‘000m3) |
|||
|
|
HY/2013/02 |
HY/2013/03 |
HY/2013/04 |
Total |
|
Jan 2016 |
1.272 |
1.950 |
0.800 |
|
|
Feb 2016 |
2.816 |
2.328 |
0.704 |
5.848 |
|
Mar 2016 |
0.600 |
2.464 |
3.942 |
7.006 |
|
Apr 2016 |
5.128 |
5.602 |
5.028 |
15.758 |
|
May 2016 |
0.000 |
0.000 |
0.000 |
0.000 |
|
Jun 2016 |
1.200 |
4.584 |
1.578 |
7.362 |
|
Sub-Total |
11.016 |
16.928 |
12.052 |
39.996 |
|
Jul 2016 |
0.728 |
10.728 |
3.690 |
15.146 |
|
Aug 2016 |
1.784 |
1.544 |
4.428 |
7.756 |
|
Sep 2016 |
2.328 |
6.816 |
3.888 |
13.032 |
|
Oct 2016 |
1.096 |
2.376 |
5.286 |
8.758 |
|
Nov 2016 |
0.000 |
0.000 |
0.000 |
0.000 |
|
Dec 2016 |
1.568 |
4.960 |
2.538 |
9.066 |
|
Cat L in Dec 2016 |
0.000 |
2.792 |
3.570 |
6.362 |
|
Sub-Total |
18.520 |
46.144 |
35.452 |
100.116 |
|
Jan 2017 |
0.000 |
0.656 |
6.552 |
7.208 |
|
Feb 2017 |
0.088 |
0.264 |
1.380 |
1.732 |
|
Mar 2017 |
0.000 |
0.000 |
0.000 |
0.000 |
|
Apr 2017 |
0.624 |
1.288 |
0.000 |
1.912 |
|
May 2017 |
0.000 |
1.440 |
0.000 |
1.440 |
|
June 2017 |
1.432 |
0.000 |
0.000 |
1.432 |
|
July 2017 |
0.000 |
0.000 |
0.000 |
0.000 |
|
August 2017 |
0.000 |
0.248 |
0.000 |
0.248 |
|
Total |
20.664 |
50.040 |
43.384 |
114.088 |
Note: All sediments are in Type II disposal method except Cat L (in Type I)