SUNDAY, OCTOBER 12, 1975.
NEW DEVICE IN CONTROLLED TIPPING OF REFUSE
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A NEW ENGINEERING DEVICE TO AVOID CONTAMINATING THE GROUND WATER IN A CONTROLLED REFUSE TIPPING AREA WILL BE INTRODUCED IN A COMING PUBLIC WORKS PROJECT.
THE DEVICE INVOLVES THE LINING OF THE VALLEY FLOORS ON WHICH REFUSE IS TO BE TIPPED WITH A WATERPROOF MEMBRANE OF P.V.C. PLASTIC TO PREVENT THE SURFACE WATER AFTER HAVING SEEPED THROUGH THE REFUSE FROM REACHING THE GROUND WATER.
THE INTERCEPTED CONTAMINATED WATER. CALLED 'LEACHATE AND CONTAINING DISSOLVED AND FINELY SUSPENDED SOLID MATTER AND MICROBIAL WASTES, IS THEN CHANNELLED OFF THROUGH A NETWORK OF SUB-SOIL DRAINS TO PUBLIC SEWERS.
CONTROLLED TIPPING IS A METHOD OF DISPOSING REFUSE WHILE AT THE SAME TIME MINIMISING ENVIRONMENTAL POLLUTION.
THE REFUSE IS SPREAD AND COMPACTED IN THIN LAYERS ON THE GROUND AND COVERED WITH EARTH EACH DAY, IN A PROPORTION OF ABOUT ONE PART OF EARTH TO FOUR PARTS OF REFUSÉ.
WHEN THE TIP IS FULL AND CAN HOLD NO MORE REFUSE, IT IS FURTHER COVERED BY A 2-METRE THICK EARTH BLANKET.
THE NEW CONTROLLED REFUSE TIP USING THESE METHODS WILL BE SET UP AT NGAU CHI WAN NEXT TO CLEAR WATER BAY ROAD.
WHEN IT IS FULLY ESTABLISHED SOME 10 HECTARES OF NEW LAND WILL BE CREATED FOR DEVELOPMENT AS OPEN SPACE, AND FOR PLANNING COMMUNITY AND INSTITUTIONAL BUILDINGS AND SCHOOLS.
THE NEW LAND WILL BE MADE UP OF THE COVERED TIPPING AREA ITSELF AND AN EXCAVATED HILLSIDE NEARBY FROM WHICH SOME 450,000 CUBIC METRES OF EARTH WILL BE TAKEN EACH DAY TO FILL UP THE REFUSE TIP.
THE EXCAVATED EARTH MATERIAL WILL ALSO BE USED IN ASSOCIATED ROAD AND DRAINAGE WORKS. THE WHOLE PROJECT IS EXPECTED TO TAKE ABOUT 27 MONTHS TO COMPLETE.
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THE PROJECT IS DESIGNED BY THE DEVELOPMENT AND AIRPORT DIVISION OF THE CIVIL ENGINEERING OFFICE, P.U.D. WHICH WILL ALSO SUPERVISE ITS CONSTRUCTION,