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Project: Paralellepipoid Noise Measurement Project
Environmental Impact Assessment
Client: Construction Contractor - Joint Venture
Location: China
Type of Project: Acoustic Assessment and Noise Measurement
Start: 2004

A major Joint Venture consortium of contractors engaged the services of Dr. David Green, of as an Accredited Monitoring Professional to determine sound power levels (SWL) for various powered mechanical equipment (PME) and prepare a noise assessment report. The use of SWL measurements provided business value and were used to advantage in the application for construction noise permits for a major drainage construction works contract.

The commencement of several related contracts had successfully brought the sewerage improvement works for the city forward into the construction phase. Advanced site preparation work started in February 2004 and construction commenced accordingly. Several sites were begun simultaneously to undertake tunnel construction works using trench less technology. Works were being carried out between the hours of 07.00hrs and 19.00hrs but not on Sundays or public holidays. However, in order to improve the progress of the works and therefore reduce the overall programme and duration of disturbance it was proposed that works could be extended from 19.00hrs to 23.00hrs or perhaps even overnight.

The objective of the noise measurements was to provide sound power levels (SWL) for several PME used routinely in the suite of trench-less technology plant and to advise on how to reduce the SWL from the individual PME by adding acoustic insulation where practicable.

This provided business value for the contractor and was necessary since the suite of PME used in trench-less works contains several pieces of equipment (de-sander etc.) not included on the list of typical sound power levels for PME published by the noise authority. Based on observation, some of the other typical construction PME used by the contractors was quite new and well maintained and had SWL much lower than the published sound power levels used for calculations under local statutory procedures.

The measurement site was selected to provide an uncomplicated environment to meet the normative qualifications for the acoustic environment set in Annex A to the BS EN ISO 3746:1966. No major items of plant or engines were near the PME being measured. The site was adjacent to a busy main road but there was not heavy traffic flowing during any of the measurement periods.



Noise measurement positions

The SWL for all major items of PME in the trench-less technology suite and some other typical plant were measured. Noise measurement followed the British and European Standard BS EN ISO 3746:1966 (Acoustics - Determination of Sound Power Levels of Noise Sources using sound pressure – Survey method using and enveloping surface over a reflecting plane).

Background monitoring of noise was undertaken with the PME switched off immediately prior to noise measurements, intermittently during noise measurements and immediately after noise measurements. Background levels were in all cases >10dB (A) lower than the measured noise at the microphone positions therefore no background correction was applied. The weather conditions and noise sources were recorded before and during monitoring. An anemometer was used to check wind speed during the noise measurements. The measurement site is fairly well sheltered and wind conditions on all occasions were still.
Sound Level Meter: O1dB SIP95 (MVI technologies group) Serial No. 988124
Acoustic Calibrator: O1dB type Cal 1 IEC 942:1988   Serial No.108800
The monitoring professional calibrated the equipment prior to use. The measurement surfaces and microphone positions from the reference box were on the parallelepiped surfaces in strict compliance line with BS EN ISO 3746:1996.

Project: Paralellepipoid Noise Measurement Project
Environmental Impact Assessment
Client: Construction Contractor - Joint Venture
Location: Nepal
Type of Project: Acoustic Assessment and Noise Measurement
Start: 2004

A major Joint Venture consortium of contractors engaged the services of Dr. David Green, of as an Accredited Monitoring Professional to determine sound power levels (SWL) for various powered mechanical equipment (PME) and prepare a noise assessment report. The SWL measurements provided business value and were used to advantage in the application for construction noise permits for a major drainage construction works contract.

The commencement of several related contracts had successfully brought the sewerage improvement works for the city forward into the construction phase. Advanced site preparation work started in February 2004 and construction commenced accordingly. Several sites were being run simultaneously to undertake tunnel construction works using trench less technology.

Works were being carried out between the hours of 07.00hrs and 19.00hrs but not on Sundays or public holidays. However, in order to improve the progress of the works and therefore reduce the overall programme and duration of disturbance in the area it was proposed that works could be extended from 19.00hrs to 23.00hrs or perhaps even overnight.

The objective of the noise measurements in this study was to provide sound power levels (SWL) for several PME used routinely in the suite of trench-less technology and to advise on how to reduce the SWL from the PME by adding acoustic insulation where practicable.

This provided business value for the contractor and was necessary since the suite of PME used in trench-less works contains several pieces of equipment (de-sander etc.) not included on the list of typical sound power levels published by the noise authority. Based on observation, some of the other typical construction PME used by the contractors was quite new and well maintained and had SWL much lower than the published sound power levels used for calculations under local statutory procedures.

The measurement site was selected to provide an uncomplicated environment to meet the normative qualifications for the acoustic environment set in Annex A to the BS EN ISO 3746:1966. No major items of plant or engines were near the PME being measured. The site was adjacent to a busy main road but there was not heavy traffic flowing during any of the measurement periods.

The SWL for all major items of PME in the trench-less technology suite and some other typical plant were measured. Noise measurement followed the British and European Standard BS EN ISO 3746:1966 (Acoustics - Determination of Sound Power Levels of Noise Sources using sound pressure – Survey method using and enveloping surface over a reflecting plane).

Background monitoring of noise was undertaken with the PME switched off immediately prior to noise measurements, intermittently during noise measurements and immediately after noise measurements. Background levels were in all cases >10dB (A) lower than the measured noise at the microphone positions therefore no background correction was applied. The weather conditions and noise sources were recorded before and during monitoring. An anemometer was used to check wind speed during the noise measurements. The measurement site is fairly well sheltered and wind conditions on all occasions were still.
Sound Level Meter: O1dB SIP95 (MVI technologies group) Serial No. 988124
Acoustic Calibrator: O1dB type Cal 1 IEC 942:1988   Serial No.108800
The monitoring professional calibrated the equipment prior to use. The measurement surfaces and microphone positions from the reference box were on the parallelepiped surfaces in strict compliance line with BS EN ISO 3746:1996.

Business value could be derived since some of the PME were unusual items of equipment for which the local noise enforcement authority had no standard SWL. Others were items of equipment which ran with SWL much lower than the standard SWL generally accepted by the local noise authority. The measurements could therefore be used for applications for construction noise permits and to determine if suites of equipment could be operated at certain times (e.g. 19.00hrs to 23.00hrs or later) in compliance with regulatory requirements. Business value for the contractor and benefits to the project accrued through greater flexibility in operating times, more optimal use of resources and the advancement of the contract programme.

Further advice was provided on how to modify the plant and include additional acoustic insulation, especially around the noisier elements of the plant, in order to reduce further the noise impact and provide additional business value.
could be derived since some of the PME were unusual items of equipment for which the local noise enforcement authority had no standard SWL. Others were items of equipment which ran with SWL much lower than the standard SWL generally accepted by the local noise authority. The measurements could therefore be used for applications for construction noise permits and to determine if suites of equipment could be operated at certain times (e.g. 19.00hrs to 23.00hrs or later) in compliance with regulatory requirements. Business value for the contractor and benefits to the project accrued through greater flexibility in operating times, more optimal use of resources and the advancement of the contract programme.

Further advice was provided on how to modify the plant and include additional acoustic insulation, especially around the noisier elements of the plant, in order to reduce further the noise impact and provide additional business value.



Locations for additional acoustic insulation

AJK Offshore 
Philippine flag
Project: Oil Pipeline & Depot Relocation, Environmental Management
Client: Joint Venture Private Consortium
Location: Philippines
Type of Project: Environmental Policy Review
Start: 2002
Dr David Green was retained by a joint venture private consortium to conduct an Environmental Policy Review to support a business plan for a proposed white oil pipeline and depot to serve Manila, Philippines. Tasks included a review of the impact of the environmental regulatory system on the business plan and the requirements for an Environmental Impact Statement for the facilities.    Read more >>
India flag
Project: National Highway Sector Project II Environmental Impact Assessment
Client: Asian Development Bank
Location: India
Type of Project: Environmental Impact Analysis
Start: 2004
National Highways Development Program, including improvement of the main central highway in India comprising most of the NH26 and NH7 in the states of Uttar Pradesh, Madhya Pradesh, Maharastra and Andhra Pradesh, is being carried out by the National Highways Authority of India.    Read more >>
Hong Kong flag
Project: Asbestos Removal, Kowloon Cricket Club, Asbestos Management.
Client: Kowloon Cricket Club.
Location: Hong Kong
Type of Project: Asbestos Management
Start: 2003
An Asbestos Management Plan was prepared for the club in 2001 that provided operational measures needed for careful monitoring and observation of ACM which was due to be removed at a later date. In 2003, prior to the renovation of the Kowloon Cricket Club, David Green completed all aspects of asbestos investigation, abatement planning, tender assessment and contractor supervision for the removal of asbestos acoustic plaster in the squash courts and trophy room.     Read more >>
China flag
Project: Paralellepipoid Noise Measurement Project Acoustical Assessment
Client: Construction Contractor - Joint Venture
Location: China
Type of Project: Acoustic Assessment and Noise Measurement
Start: 2004
A major Joint Venture consortium of contractors engaged the services of Dr. David Green, of as an Accredited Monitoring Professional to determine sound power levels (SWL) for various powered mechanical equipment (PME) and prepare a noise assessment report.     Read more >>
Hong Kong flag
Project: Ting Kau Bridge, Environmental Management.
Client: Highways Department (Hong Kong Government).
Location: Hong Kong
Type of Project: Environmental Monitoring and Audit
Start: 1995 - 1997
As Associate Director for his previous employer Dr David Green took up the role of Project Manager for the Highways Departmentís internal environmental monitoring and audit team, seconded from the employer. The EM&A team monitored the Contractorís EM&A programme and managed and administrative staff team for 3 years.    Read more >>
Pakistan flag
Project: Industrial Efficiency and Environmental Management
Client: Asian Development Bank
Location: Pakistan, Islamic Republic Of
Type of Project: Fact Finding Mission
Start: 2003
Dr David Green was retained by ADB as Environmental Specialist to advise the mission leader on all aspects of Environmental Management Planning and Environmental Criteria and requirements for Environmental Impact Assessment under ADB and Pakistan Government regulations.    Read more >>
Sri Lanka flag
Project: National Highway Sector Development Project Review Bypass Options
Client: Asian Development Bank
Location: Sri Lanka
Type of Project: Social and Environmental Analysis
Start: 2005
The A012 Puttalam to Anuradhapura is at the west end of the A012 in Sri Lanka's North Western Province and to the south of the Wilpattu National Park. There is ample RoW to allow improvement for most of it's length. However, in the Puttalam area, west of km2 the road passes over a railway level crossing and through the urban area, past three schools and through the market in the town centre.    Read more >>
Sri Lanka flag
Project: Southern Transport Development Project - Environmental Management
Client: Asian Development Bank
Location: Sri Lanka
Type of Project: Review Mission
Start: 2005
The ADB project loan provides funding for the construction of the southern 60km stretch of the 150km highway and aims to improve improved road transportation between Colombo south to Mattara. Spur roads are provided to the coast to relieve congestion on existing roads and improve overall transport efficiency. Tasks included a review of the environmental management plan approved by Central Environmental Authority of Sri Lanka and review of monitoring reports.    Read more >>
Sri Lanka flag
Project: National Highway Sector Development Project Environmental Impact Assessment
Client: Asian Development Bank
Location: Sri Lanka
Type of Project: Environmental Impact Analysis
Start: 2005
The Karuwalagaswewa (Tabbowwa) wildlife sanctuary is in Sri Lanka's North Western Province and was created to encompass traditional elephant migration paths which cross the existing A012 road. The project road is the western 70km stretch of the A012 from Puttalam to Anuradhapura.    Read more >>
China flag
Project: Paralellepipoid Noise Measurement Project Environmental Impact Assessment
Client: Construction Contractor - Joint Venture
Location: China
Type of Project: Acoustic Assessment and Noise Measurement
Start: 2004
A major Joint Venture consortium of contractors engaged the services of Dr. David Green, of as an Accredited Monitoring Professional to determine sound power levels (SWL) for various powered mechanical equipment (PME) and prepare a noise assessment report.    Read more >>
Hong Kong flag
Project: Urban Redevelopment Environmental Assessment
Client: Urban Renewal Authority
Location: Hong Kong
Type of Project: Environmental Noise and Air Quality Assessment
Start: 2004
The redevelopment of dilapidated areas of Hong Kong is led by the Urban Renewal Authority. The Comprehensive Implementation Planning Study was undertaken for the redevelopment of Kwun Tong Town Centre, Hong Kong. An Environmental Assessment (EA) was completed which identified environmental impacts and proposed mitigation.    Read more >>
Hong Kong flag
Project: KCRC East Rail Lok Ma Chau Station, Environmental Management.
Client: Balfour Beatty Lam Joint Venture (Lam Environmental Services).
Location: Hong Kong
Type of Project: Environmental Monitoring and Audit
Start: 2002 - 2003
Dr David Green was retained by the Balfour Beatty Lam Joint Venture (BBLJV) through Lam Environmental Services Lam as Environmental Team Leader for the LCC300 project from November 2002 to June 2003.     Read more >>
Nepal flag
Project: Road Connectivity Sector Project Environmental Impact Assessment
Client: Asian Development Bank
Location: Nepal
Type of Project: Environmental Impact Assessment
Start: 2005
The Transport Connectivity Sector Project includes the upgrading and improvement of over 500km of feeder roads linking upland rural areas to the main central highways in all five development zones from far west to eastern Nepal. The implementation will be carried out by the Department of Roads.    Read more >>