XN000022-1991-07-07 — Page 5

SUNDAY, JULY 7, 1991

IT

DID NOT

IN

ALTHOUGH THE FREE VENTING GAS HAD A STRONG ODOUR, GIVE RISE TO ENVIRONMENTAL CONCERN AS THERE WAS LITTLE DEVELOPMENT THE AREA DURING THE EARLY 1980S.

CROSSING,

MAJOR

WITH THE CONSTRUCTION OF THE EASTERN HARBOUR

THE LANDFILL SITE DEVELOPMENTS WERE PLANNED IMMEDIATELY ADJACENT TO WHICH WOULD RESULT IN A POPULATION OF AROUND 40,000 LIVING WITHIN METRES OF THE LANDFILL.

1987, THE SERVICES

500

GEOTECHNICAL IN

CONTROL OFFICE OF THE CIVIL ENGINEERING

DEPARTMENT COMPLETED AN INITIAL FEASIBILITY STUDY WHICH SHOWED POTENTIAL RISKS TO THE PROPOSED REFUSE SLOPE INSTABILITY AND THE MIGRATION OF LANDFILL GAS.

DEVELOPMENTS FROM

THE SAFETY OF IMPLEMENTED

IN ORDER TO MINIMISE THESE RISKS AND TO ENSURE SURROUNDING DEVELOPMENTS, THE GEOTECHNICAL CONTROL OFFICE A PROGRAMME OF LANDFILL RESTORATION WORKS WHICH JUNE 1989.

THE MAJOR WORKS INCLUDED THE FOLLOWING:

STARTED ON SITE IN

REGRADING RECOMPACTION AND

OF THE SOIL COVER OVER THE ENTIRE LANDFILL AREA TO PROVIDE ADEQUATE STABILITY AND ALLOW THE WHOLE AREA TO BE USED FOR PASSIVE RECREATION IN FUTURE.

OF

PROVISION OF A LANDFILL GAS EXTRACTION SYSTEM CONSISTING GAS WELLS, GAS PIPES AND AN ABSTRACTION PLANT TO EXTRACT AND DISPOSE OF THE GAS THROUGH CONTROLLED FLARING.

*

PROVISION OF A GAS CUT OFF BARRIER AROUND THE THE SITE.

PERIMETER

OF

*

*

PROVISION OF A SURFACE POLYETHYLENE PERFORATED ONGOING SETTLEMENT OF THE LANDFILL.

PIPES

PROVISION OF ON-SITE AND OFF-SITE GAS MONITORING POINTS.

OF FLEXIBLE SYSTEM CAPABLE OF TOLERATING THE

DRAINAGE

GAS CONTROL GAS CONSULTANT,

THE STUDY AND PRELIMINARY DESIGN OF LANDFILL

A MEASURES WERE UNDERTAKEN BY

SPECIALIST LANDFILL EMPLOYED BY THE ENVIRONMENTAL PROTECTION DEPARTMENT.

THE CIVIL

AND GEOTECHNICAL WORKS

ASSOCIATED WITH THE GAS WORKS WERE DESIGNED AND AND THE INSTALLATION SUPERVISED BY THE

SLOPE STABILISATION CONTROL MEASURES AND SUPERVISED BY THE GEOTECHNICAL CONTROL OFFICE,

WAS EQUIPMENT OF THE GAS EXTRACTION AND FLARING

ELECTRICAL AND MECHANICAL SERVICES DEPARTMENT.

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