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Environmental Aspects

Solutions mitigating air pollution
1. reduce dust
  1. concrete breaking
    1. wet concrete surface
    2. alternative techniques
      1. hydraulic splitter
      2. coring
      3. wire-sawing
      4. chemical breaking
  2. soil surface
    1. continuous spraying water on surface
    2. pave with concrete/ hardcore
  3. temporary soil heave
    1. cover with plastic cover
  4. spread of dust
    1. hoarding of adequate height
    2. wash the wheels of trucks
    3. X use compressed air to clean dusty roads/surfaces
    4. material hoist covered with plastic sheets
  5. material easily blown away
    1. store indoor/ enclose
2. eliminate fumes generated in electric-arc welding
  1. use bolt-and-nut connection
3. reduce smoke
  1. open burning prohibited (special permission from EPD)
4. indoor air quality control (maintenance & repair works)
  1. extract air pollutants
    1. exhaust fan
  2. -ve pressure maintained indoor
Solutions mitigating noise pollution
1. percussive (displacement) piling
  1. use bored piles
  2. add sound -absorbing enclosure around head of pile
  3. use noise- reduction resilient packing at pile head
  4. use hydraulic /vibratory pile driving
2. general works
  1. stricter control on
    1. Specified powered mechanical equipment
      1. hand-held percussive breaker
      2. concrete lorry truck, dump truck
      3. bulldozer
      4. vibratory poker
    2. prescribed construction work
      1. erection/dismantling of formwork
      2. handling of steel bars
      3. hammering
3. add acoustic barriers/ machinery enclosures
4. break concrete using alternative techniques
5. use plastic refuse chute
6. scrabble of concrete at stop-ends & construction joints
  1. replaced by metal stop-ends
7. locate the noise generating works away from sensitive users
  1. water pumping station
  2. concrete batching plant
8. repair and maintenance works in occupied buildings
  1. use concrete crushing machine
  2. hoarding - noise enclosure
  3. work time suit building use
  4. phasing of works
treatment of sewage
1. waste water filtered and sediment before discharge
2. recycle and reuse of wastewater
  1. waste water in truck washing system
3. open channels to collect waste water
4. silt traps
construction & demolition waste
1. policy implemented
  1. trip-ticket system
  2. user-pay policy/ waste charge scheme
  3. waste management plan for public works
2. waste reduction
  1. Building design
    1. slim construction design
    2. balanced cut and-fill design
  2. Formwork
    1. coupler (reinforcement bar lapping at connection)
    2. use of reusable and durable material
      1. metal formwork/ scaffolding & gondola/ hoarding (timber/bamboo/timber)
      2. high density overlaid plywood
        polymer resin coating on plywood formwork
      3. Pecaform
        laminating a layer of polyethylene to both sides of a high tensile steel wire mesh
  3. Concrete work
    1. re-use of concrete/masonry waste as recycled aggregate
      1. paving bricks
      2. concrete curbs
      3. concrete blocks
    2. Dry wall (concrete block wall)
      1. galvanized steel stud frame lined with fibre cement sheets+ lightweight concrete
    3. PFA concrete
  4. Mansory work
    1. spraying mortar
  5. Demolition
    1. sequential demolition
  6. material management
    1. proper storage of materials at site
    2. onsite control of materials

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Environmental Aspects

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