Appendix 4 IMPLEMENTATION SCHEDULE

Table A4.1 Recommended Maximum Daily Dredging VolumeRates (in-situ Volume) for Working Zones

Season	Wet Season (m^3/day) (April to September)				Dry Season (m^3/day) (October to March)
Working Zone	ABn	ABs	BCn	BCs	ABn	ABs	BCn	BCs
Grab Dredger with Silt Curtains (Grab Capacity ³ 8 m^3)	33,800	31,400	26,300	21,200	43,800	33,200	33,200	34,200
TSHD	12,500	11,300	8,300	5,300	39,500	34,300	27,000	19,700

Note:

(a) The recommended maximum dredging rate refers to the maximum dredging rates when all dredging activities taking place at one particular working zone. For the grab dredger option, dredging may be carried out concurrently at more than one working zones during some time periods. In this case, the combined dredging rates during those time periods should not exceed the lowest of the maximum rates recommended for the concerned working zones.

The above maximum daily dredging rates are based on 24-hour operations. If the daily working hours are restricted, the maximum daily dredging rates should be reduced proportionally.

The division of working zones are illustrated in Figure A4.2.

Table A4.2 Recommended Maximum Hourly/Cycle Dredging Volume (in-situ Volume) for Working Zones

Season	Wet Season (m^3) (April to September)				Dry Season (m^3) (October to March)
Working Zone	ABn	ABs	BCn	BCs	ABn	ABs	BCn	BCs
Grab Dredger with Silt Curtains (Grab Capacity ³ 8 m^3)	1,549	1,439	1,205	972	2,008	1,522	1,522	1,568
TSHD	1,432	1,295	951	607	4,526	3,930	3,094	2,257

Note:

(a) The recommended maximum dredging rate refers to the maximum dredging rates when all dredging activities taking place at one particular working zone. For the grab dredger option, dredging may be carried out concurrently at more than one working zones during some time periods. In this case, the combined dredging rates during those time periods should not exceed the lowest of the maximum rates recommended for the concerned working zones.

(b) The division of working zones are illustrated in Figure A4.2.

Appendix 4 IMPLEMENTATION SCHEDULE

^EIA Ref.	^EM&A Log Ref	^Environmental Protection Measures	^Location/Duration of Measures/Timing of Completion of Measures	^Implementation Agent	^Implementation Stage				^Relevant Legislation & Guidelines
					^Des	^C	^O	^Dec
Mitigation Measures for both Grab Dredger and TSHD Options
3.11		^No dredging should be carried out at Working Zone BCs from February to April.	Location: Working Zone BCs Timing/Duration: February to April	HEC & Dredging Contractor		a			Wild Animals Protection Ordinance, Marine Parks Ordinance and Marine Parks Regulations, Animals and Plants Ordinance
3.11		^Vessel route between the dredging site and the disposal sites should avoid the Finless Porpoise habitat area and be subject to a maximum speed limit of 10 knots in southern Lamma waters as indicated in Figure A4.3.	Location: South Lamma Timing/Duration: During the Project period	HEC & Dredging Contractor		a			Wild Animals Protection Ordinance, Marine Parks Ordinance and Marine Parks Regulations, Animals and Plants Ordinance
5.2		^The number of dredgers and operation conditions specified in the applicable CNPs should be strictly followed. In applying for the CNPs, it should be ensured that the number of dredgers and operation conditions are compatible with the recommendations of this EIA.	Location: The Project Area Timing/Duration: During restricted hours of the Project period	HEC & Dredging Contractor		a			Noise Control Ordinance
2.11.2		^The g^rab dredger^option^and TSHD^option^should not be operated concurrently.	Location: The Project Area Timing/Duration: During the Project period	HEC & Dredging Contractor		a			WQOs for Southern and Western Buffer WCZs, WPCO, Noise Control Ordinance

^EIA Ref.	^EM&A Log Ref	^Environmental Protection Measures	^Location/Duration of Measures/Timing of Completion of Measures	^Implementation Agent	^Implementation Stage				^Relevant Legislation & Guidelines
					^Des	^C	^O	^Dec
Mitigation Measures for TSHD Option Only
2.11.4		^Dredging works should be carried out in phases in accordance with the programme, number of dredgers and maximum dredging rates specified in Table^A4.3^.	Location: The Project Area Timing/Duration: During dredging	HEC & Dredging Contractor		a				WQOs for Southern and Western Buffer WCZs, WPCO
2.11		^There should not be more than one TSHD operating concurrently at any time.	Location: The Project Area Timing/Duration: During dredging	HEC & Dredging Contractor		a				WQOs for Southern and Western Buffer WCZs, WPCO
Mitigation Measures for Grab Dredger Option Only
2.11.4		^Dredging works should be carried out in phases in accordance with the programme, number of dredgers and maximum dredging rates specified in Table^A4.2^.	Location: The Project Area Timing/Duration: During dredging	HEC & Dredging Contractor		a				WQOs for Southern and Western Buffer WCZs, WPCO, Noise Control Ordinance
2.8.12		^Each grab dredger to be deployed should have a grab capacity of no less than 8 m3.	Location: The Project Area Timing/Duration: During dredging	HEC & Dredging Contractor		a				WQOs for Southern and Western Buffer WCZs, WPCO
2.12		^Cage-type silt curtains^as illustrated in Figure A4.1^should be deployed for grab dredgers^.^T^he silt curtains should be properly maintained during the dredging period.	Location: The Project Area Timing/Duration: During dredging	HEC & Dredging Contractor		a				WQOs for Southern and Western Buffer WCZs, WPCO
2.11		^There should be no more than 5 grab dredgers operating concurrently at any time.	Location: The Project Area Timing/Duration: During dredging	HEC & Dredging Contractor		a				WQOs for Southern and Western Buffer WCZs, WPCO, Noise Control Ordinance

EIA Ref.	EM&A Log Ref	^Environmental Protection Measures	Location/Duration of Measures/Timing of Completion of Measures	Implementation Agent	Implementation Stage				Relevant Legislation & Guidelines
					Des	C	O	Dec
Good Site Practice
2.12		^Daily dredging volume should be spread as evenly as possible over the 24 hour period whenever practical. ^Special care should be taken during lowering and lifting grabs to minimize unnecessary disturbance to the seabed.	Location: The Project Area, the disposal areas and on route between the dredging site and the disposal areas Timing/Duration: During dredging and disposal	HEC & Dredging Contractor		a			WQOs for Southern and Western Buffer WCZs, WPCO
		Vessels used should have adequate clearance of the seabed.
		^Barges should be fitted with tight fitting seals to their bottom openings to prevent leakage of material.
		^Grabs should be tightly closed and hoist speed is suitably low.
		^Barges should not be filled to a level which will cause overflow of materials during loading and transportation.
		^Appropriate monitoring of WQ in accordance with EM&A Manual during dredging works should be undertaken to allow the implementation of appropriate Action Plans to prevent any unacceptable WQ impacts.
		^Large objects should be removed from the grab to avoid losses from partially closed grabs.

EIA Ref.	EM&A Log Ref	^Environmental Protection Measures	Location/Duration of Measures/Timing of Completion of Measures	Implementation Agent	Implementation Stage				Relevant Legislation & Guidelines
					Des	C	O	Dec
3.11		^T^he vessel operators should be fully briefed on the following: ^·^Possible presence of dolphins and porpoises in the vicinity of the Study Area and along routes to the Project Area; ^·^Rules for safe vessel operation around cetaceans; · Slowing to 10 knots in the presence of cetaceans within the area marked on Figure A4.3; and · The dumping of chemicals, rubbish, oils etc into the waters is strictly prohibited and enforced.	Timing: In the event of spotting porpoises or dolphins	Dredging Contractor		a			Wild Animals Protection Ordinance, Marine Parks Ordinance and Marine Parks Regulations, Animals and Plants Ordinance, Dumping at Sea Ordinance, Waste Disposal Ordinance

Table A4.1 Recommended Maximum Daily/Hourly/Cycle Dredging Volume (in-situ Volume) for Working Zones

^Season		^Wet Season (April to September)				^Dry Season (October to March)
Working Zone		ABn	ABs	BCn	BCs	ABn	ABs	BCn	BCs
Grab Dredger with Silt Curtains (Grab Capacity ³ 8 m^3)	m^3/day	33,800	31,400	26,300	21,200	43,800	33,200	33,200	34,200
	m^3/hr	1,549	1,439	1,205	972	2,008	1,522	1,522	1,568
TSHD	m^3/day	12,500	11,300	8,300	5,300	39,500	34,300	27,000	19,700
	m^3/cycle	1,432	1,295	951	607	4,526	3,930	3,094	2,257

Note:

(a) The recommended maximum dredging rate refers to the maximum dredging rates when all dredging activities taking place at one particular working zone. For the grab dredger option, dredging may be carried out concurrently at more than one working zones during some time periods. In this case, the combined dredging rates during those time periods should not exceed the lowest of the maximum rates recommended for the concerned working zones.

(b) The above maximum daily dredging rates are based on 24-hour operations. If the daily working hours are restricted, the maximum daily dredging rates should be reduced proportionally.

(c) The division of working zones are illustrated in Figure A4.2.

(d) For the grab dredger option, recommended maximum hourly dredging rate = 1.1 * recommended maximum daily dredging rate/24.

(e) For the TSHD option, recommended maximum cycle dredging rate = 1.1 * recommended maximum daily dredging rate/9.6 (where 9.6 is the number of dredging cycle in a day assumed in water quality modelling).

Table A4.2 Proposed Working Schedule - Grab Dredger Option

^Working Zone	^Construction Programme
	^May-03	^Jun-03	^Jul-03	^Aug-03	^Sep-03	^Oct-03	^Nov-03	^Dec-03
ABn	GD1	GD1	GD1	GD1	GD1	GD1
	GD2	GD2	GD2	GD2	GD2	GD2	GD2	GD2
ABs	GD3	GD3	GD3	GD3	GD3	GD3	GD3	GD3
	GD4	GD4	GD4	GD4	GD4
BCn	GD5	GD5	GD5	GD5	GD5	GD5
BCs						GD4	GD4	GD4
							GD5	GD5
							GD1	GD1
Maximum dredging rate (m^3/day)	26,300					33,200
Maximum dredging rate (m^3/hr)	1,205					1,522

Note:

1. GD1 denotes Grab Dredger No. 1.

2. The above maximum daily dredging rates are based on 24-hour operations. If the daily working hours are restricted, the maximum daily dredging rates should be reduced proportionally.

Table A4.3 Proposed Working Schedule - TSHD Option

^Working Zone	^Construction Programme
	^May-03	^Jun-03	^Jul-03	^Aug-03	^Sep-03	^Oct-03	^Nov-03	^Dec-03
ABn	TSHD
ABs							TSHD
BCn								TSHD
BCs						TSHD
Maximum dredging rate (m^3/day)	12,500					19,700	34,300	27,000
Maximum dredging rate (m^3/cycle)	1,432					2,257	3,930	3,094

Note:

1. TSHD denotes Trailer Suction Hopper Dredger

2. The above maximum daily dredging rates are based on 24-hour operations. If the daily working hours are restricted, the maximum daily dredging rates should be reduced proportionally.