Appendix 9.1        Implementation Schedule of Mitigation Measures Recommended in HAZOP Study

 

 

The following mitigation measures were identified during the HAZOP Study.  These mitigation measures are generally safety measures and would not be included in the Environmental Monitoring and Audit Manual.  It is recommended to include the following measures into the contractual document to ensure their implementation.

 

Table A9.1      Mitigation Measures Recommended to Avoid Occurrence of Hazardous Scenarios Related to Chlorine

EIA

Ref#

Environmental Protection Measures

Location / Timing

Implementation Agent

Implementation Stages *

Relevant Legislation & Guidelines

 

D

C

O

 

Construction Phase

 

S9.5.1

 

 

Monitoring and Inspection

 

·          Monitor the excavation activity to avoid excavation to the wrong depth (too much excavation)

·          Conduct monitoring to ensure the stability of building during construction phase

·          Inspection and supervision to ensure operation of equipment properly

·          Inspection of excavation progress near Chlorine Building and Chemical Storage Building

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Contractor

 

 

·          Contractor

 

·          Safety Officer (Contractor)/ Contractor

·          Safety Officer (Contractor)/ Contractor

 

Ö

 

EIAO-TM

F&IUO

DGO

 

S9.5.1

 

 

 

 

 

 

 

 

 

 

 

 

S9.5.1 and S9.5.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S9.5.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S9.5.1

 

 

Management

 

Waste Management

·          Ensure good C&D waste management

·          Provide on-site sorting of debris to avoid excessive debris accumulation

·          Provide temporary storage for debris at appropriate location

·          Ensure flammable waste is stored at appropriate/designated location

 

 

 

Traffic Management

·          Maintain access roads as a freeway

·          Provide sufficient maintenance of the vehicle/generator/equipment

·          Set a speed limit for site vehicle

·          Propose a designated route for site vehicles, avoid site vehicle using travelling route of the Chlorine Delivery Truck

·          Provide adequate fire fighting equipment at the storage area

·          Provide clear road signs for site vehicles

·          Install hump on the access roads to reduce the speed of site vehicles

·          Provide crash barrier to protect the Chlorine Building and the Chemical Storage Building

·          No parking on access road, or proper parking area designated for dump trucks

 

Chemicals/material Management

·          Ensure good management of material delivery to avoid excessive material stock on site

·          Avoid incompatible chemicals storing together; provide separate storage locations for different chemicals which are incompatible to each other

·          Provide appropriate labels according to Dangerous Goods Ordinance

·          Follow Fire Services Department’s requirement for flammable waste storage

·          Keep the amount of flammable waste stored at a minimum level

·          Ensure adequate separation distance between each flammable material storage area

·          No stockpile of material near the Chlorine Building and the access road is allowed

 

·        Follow the requirements stipulated in Dangerous Goods Ordinance and its subsidiary regulations for the storage, conveyance and use of potassium permanganate, nitrogen and other substances giving inflammable vapour during the construction stage

·        Follow EPD’s requirement for the storage and conveyance of chemical waste

 

Construction Activity/personnel Management

Personnel

·          Ensure sufficient guarding at Siu Ho Wan WTW to provide sufficient access control

·          Provide clear indication of rooms accommodating chlorine-related facilities and their hazards 

 

Activity

·          Propose a communication system between operator of Siu Ho Wan WTW and the Contractor on the date of chlorine delivery to the WTW

·          Prepare a safety plan to avoid any electricity supply facilities located inside/adjacent to the Chlorine Building

·          Propose a “Permit-to-move” system for large equipment/plant movement:

·       Contractor provides WSD a list indicating the number and type of equipment/plant to be mobilized, equipment/plant movement route and mobilization methodology

·       A risk assessment is conducted by Safety Officer (Contractor)

·       No equipment/plant movement should be allowed before approval from WSD/Safety Officer is obtained

·       The “Permit” shall restrict the time period that equipment/plant can be mobilized

·       Supervision of permitted work by Safety Representatives from Contractor

 

·          Follow WSD’s “Permit-to-work” System for extended chlorine pipework connection

·          No connection work can commence before approval from WSD is obtained

·          Supervision of permitted works by the Contractor’s Safety Representative

·          No blasting operation on site is allowed

·          Define restricted zone for the equipment (i.e. keep the equipment from the Chlorine Building at a safe distance).  The extent of the restricted zone would be determined by the size of the equipment

·          Restrict excavation along travelling route of the Chlorine Delivery Truck

·          Limit the reach of the tower crane used

·          Provide indication/sign for chlorine pipeworks

·          Ensure generators are placed at a safe distance from Chlorine Building

·          Provide method statement with protective measures for the chlorine dosing pipeworks (and other facilities)

·          Avoid welding operation inside buildings installed with chlorine pipeworks

·          If welding is unavoidable, “Hot-work permit” system should be applied for welding operation inside buildings installed with chlorine pipeworks:

·          No welding work is allowed before approval from WSD is obtained

 

·          Provide supervision to the operations inside buildings installed with chlorine pipeworks by the Safety Representative from Contractor

 

Landscaping Work Management

 

·          Avoid plantation of deep root trees near buildings, especially Chlorine Building

·        Trim any vegetation near the chlorine building or work site prevent the spread of fire

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

 

·          Contractor

·          Contractor

 

·          Contractor

 

·          Contractor

 

 

 

 

 

·          Contractor

·          Contractor

 

·          Contractor

·          Contractor

 

 

·          Contractor

 

·          Contractor

·          Contractor

 

·          Contractor

 

·          WSD/ Contractor

 

 

 

·          Contractor

 

 

·          Contractor

 

 

 

·          Contractor

 

·          Contractor

 

·          Contractor

 

·          Contractor

 

·          Contractor

 

 

·          Contractor

 

 

 

 

 

·          Contractor

 

 

 

 

·          WSD/ Contractor

 

·          WSD/ Contractor

 

 

 

 

·          WSD/ Contractor

 

 

 

·          Contractor

 

 

·          WSD/Safety Officer (Contractor)/ Contractor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

·          WSD/ Safety Representative (Contractor)/ Contractor

 

 

 

·          Contractor

·          Contractor

 

 

 

 

·          Contractor

 

·          Contractor

·          Contractor

 

·          Contractor

 

·          Contractor

 

 

·          Contractor

 

·          WSD/ Safety Representative (Contractor)/ Contractor

 

 

 

 

 

 

 

 

 

 

 

·          Contractor

 

·          Contractor

 

 

Ö

 

EIAO-TM

F&IUO

DGO

 

S9.5.1

Investigation

 

·          Investigate the lateral support of buildings/excavation to ensure proposed extent of excavation would not affect building stability

·          Locate chlorine pipeworks before execute excavation

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Engineer/ Contractor

 

 

 

·          Contractor

 

Ö

 

EIAO-TM

S9.5.1

Training

 

·          Provide adequate training to equipment operator; implement a license system that only competent persons could operate the equipment

·          Provide adequate training to construction workers on the rooms accommodating chlorine-related facilities and their associated hazards

·          Provide adequate training to construction workers on the nature and hazards of chlorine, safety precautions and emergency measures for leakage of chlorine from cylinders, piping or installations.

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Contractor

 

 

 

·          Contractor

 

 

 

·          Contractor

 

Ö

 

EIAO-TM

F&IUO

OSHO

DGO

 

 

Operation Phase

N/A

N/A

N/A

N/A

 

 

 

N/A

#              All recommendations and requirements resulted during the course of EIA / EA Process, including ACE and / or accepted public comment to the proposed Project.

*              D = Design, C = Construction and O = Operation

N/A          Not applicable      

 

Table A9.2      Other Appropriate Measures Recommended to be Implemented During Construction Stage

 

EIA

Ref#

Environmental Protection Measures

Location / Timing

Implementation Agent

Implementation Stages *

Relevant Legislation & Guidelines

D

C

O

Construction Phase

S9.5.5

 

 

Traffic Management

 

·          Maintain all access roads of fire engine/FSD vehicles/ambulance as a freeway

·          No equipment/plants and site vehicle is allowed to park on the access roads

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Contractor

 

·          Contractor

 

 

 

Ö

 

EIAO-TM

S9.5.5

False Alarm Preventive Measures

 

·          Provide dust suppression measures such as covering the dusty material

·          Implement “Hot-work Permit” system and provide sufficient ventilation during welding operation to avoid accumulation of smoke

·          Place the generators away from the chlorine leak/smoke detector alarms

·          Park the construction equipment and vehicles away from the Chlorine Building

·          Notify WSD prior to the use of chemical compounds and provide sufficient ventilation during operation involving chemicals

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Contractor

 

·          Contractor

 

 

 

·          Contractor

 

·          Contractor

 

·          Contractor

 

 

 

 

Ö

 

EIAO-TM

F&IUO

DGO

S9.5.5 and S9.5.6

Measures to be stipulated in emergency plan

 

·          Provide a system for logging in-out record of all site staff, which could assist immediate investigation and rescue in a chlorine leak incident when required

·          Ensure construction workers be familiar with chlorine alarm system (e.g. proper training)

·          Propose construction workers to participate regular joint chlorine leak drill arranged by WSD, and inform local fire stations in advance

·          Propose alternative assembly point(s) for construction workers in case of chlorine leakage event

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Contractor

 

 

 

·          Contractor

 

 

·          Contractor

 

 

·          Contractor

 

 

 

 

 

Ö

 

EIAO-TM

F&IUO

S9.5.6

Others

 

·          Provide sufficient number of fire extinguishers

·          Provide copies of the safety and emergency plans to local fire stations for information

·          Brief local fire stations for the implementation of safety and emergency plans

 

 

Inside Siu Ho Wan WTW/ throughout construction stage

 

 

·          Contractor

 

·          Contractor

 

·          WSD/ Contractor

 

Ö

 

EIAO-TM

F&IUO