Presentation on theme: "Earth Control Measures at Project Detail Site Location Marina Barrage."— Presentation transcript:
Earth Control Measures at
Site Location Marina Barrage
Site Location Marina Bay Sands IR
ShearesAvenue Earth Control Measures Layout Water Treatment System Perimeter Cut-Off Drain with Silt Fence on both sides Silt Trap Water Storage Pond One discharge Point
Earth Control Measures Implementation
Earth Control Measures Earth Control measures at construction site is of greater urgency and importance now as Singapore has to harness every drop of water so that Singaporeans can enjoy clean, clear water and a healthy environment.
Erosion Control much easier and more cost effective to prevent erosion than to trap sediments earth work shall be sequenced and scheduled in stages and progressively to minimize bare earth surfaces. All construction access and bare surfaces shall be paved up with concrete or milled waste or other suitable materials. To turf up bare surfaces immediately in an earthwork if there is no subsequent construction activities. All bare slopes shall be protected with cemetitious spray, close-turfing or erosion control blankets. All earth stokepiles shall be protected by canvas sheet or erosion control blanket.
Sediment Control To provide concrete lined cut off drains along the perimeter of the construction sites. To provide sit fence properly installed and embedded onto the ground along the perimeter cut-off drains Intermediate silt traps shall be installed for every 30 metres along the perimeter lined cut-off drain. Intermediate silt traps shall be installed for every 30 metres along the perimeter lined cut-off drain. To provide sedimentation basins along the perimeter cut off drains and before discharge points into public drains.
Estimation of Surface Runoff
Estimation of Discharge Capacity
No of Wet days a year
Estimation of Sediment yield
Estimation of Soil Erodibility
Wheel Wash at Main entrance
Water treatment system provided at wheel wash
Perimeter cut off drain Concrete lining Silt fence
After exvavation, all rainwater will be retain at basement Diaphragm wall completed Concrete lining at slope
Existing turfing to be retained
Main Water holding area before treatment
Water Treatment System
Discharge of Slurry after water treatment Slurry discharged to slurry collection area
Discharge of water to existing canal after treatment
The discharge into the storm water drainage system shall not contain Total Suspended Solids in concentrations greater than 50 milligrams per litre of the discharge.
Continuous monitoring will be implemented on site
Existing drain within construction site maintained regularly
Maintenance Programme Regular checks on the ECM that have been put in place The checks including the inspection of slope, drain, erosion blanket, silt fence, curb inlet sediment barrier, sediment tank. Damage, choke or any problem which cause ineffectiveness should be recorded and reported. The washing bays with sump pump at all entrances/exits must be also properly maintained. Servicing & repair required for the ECM should be looked into and immediate necessary repair/service or improvement should be carried out with urgency.
Increase in composition fines Regulation 4 TSS >50mg/l $1,000 and $2,500 in the case of a second offence
CHECKLIST FOR MAINTENANCE OF EARTH CONTROL MEASURES