Upload
kasimir-garner
View
58
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Earth Control Measures at. MARINA BAY SANDS IR DEVELOPEMENT. Project Detail. Site Location. Marina Barrage. Site Location. Marina Bay Sands IR. Earth Control Measures Layout. One discharge Point. Water Treatment System. Water Storage Pond. Sheares Avenue. Silt Trap. - PowerPoint PPT Presentation
Citation preview
Sheares Avenue
Sheares Avenue
Earth Control Measures LayoutEarth Control Measures LayoutWater Treatment SystemWater Treatment System
Perimeter Cut-Off Drain Perimeter Cut-Off Drain with Silt Fence on both sideswith Silt Fence on both sides
Silt TrapSilt Trap
Water Storage PondWater Storage Pond
One discharge PointOne discharge Point
Earth Control MeasuresEarth 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 ControlErosion Control much easier and more cost effective to prevent erosion much easier and more cost effective to prevent erosion
than to trap sediments than to trap sediments
earth work shall be sequenced and scheduled in stages earth work shall be sequenced and scheduled in stages and progressively to minimize bare earth surfaces. and progressively to minimize bare earth surfaces.
All construction access and bare surfaces shall be All construction access and bare surfaces shall be paved up with concrete or milled waste or other paved up with concrete or milled waste or other suitable materials.suitable materials.
To turf up bare surfaces immediately in an earthwork if To turf up bare surfaces immediately in an earthwork if there is no subsequent construction activities.there is no subsequent construction activities.
All bare slopes shall be protected with cemetitious All bare slopes shall be protected with cemetitious spray, close-turfing or erosion control blankets.spray, close-turfing or erosion control blankets.
All earth stokepiles shall be protected by canvas sheet All earth stokepiles shall be protected by canvas sheet or erosion control blanket.or erosion control blanket.
Sediment ControlSediment Control To provide concrete lined cut off drains To provide concrete lined cut off drains
along the perimeter of the construction along the perimeter of the construction sites.sites.
To provide sit fence properly installed and To provide sit fence properly installed and embedded onto the ground along the embedded onto the ground along the perimeter cut-off drains perimeter cut-off drains
Intermediate silt traps shall be installed for Intermediate silt traps shall be installed for every 30 metres along the perimeter lined every 30 metres along the perimeter lined cut-off drain. cut-off drain.
To provide sedimentation basins along the To provide sedimentation basins along the perimeter cut off drains and before perimeter cut off drains and before discharge points into public drains. discharge points into public drains.
After exvavation, all rainwater After exvavation, all rainwater will be retain at basementwill be retain at basement
Diaphragm wall completedDiaphragm wall completed
Concrete lining at slopeConcrete lining at slope
Discharge of Slurry after water Discharge of Slurry after water treatmenttreatment
Slurry discharged to slurry Slurry discharged to slurry collection areacollection area
Discharge of water to existing Discharge of water to existing canal after treatmentcanal after treatment
Discharge of water to existing Discharge of water to existing canal after treatmentcanal after treatment
The discharge into the storm The discharge into the storm water drainage system shall not water drainage system shall not
contain Total Suspended Solids in contain Total Suspended Solids in concentrations greater than 50 concentrations greater than 50
milligrams per litre of the discharge.milligrams per litre of the discharge.
- cost of chemical = $0.20 to $0.60 per m3 (mixed chemical by supplier)
- assume running on full capacity for 24 hrs- for four (4) unit of ASIII-10 = $144.00 per day x 4 nos = $576.00- for two (2) unit of ASIII-40 = $288.00 per day x 2 nos = $576.00- total chemical cost per day = $1,152.00
- chemical used:- (1) Polymer = $10/kg- (2) Ferrichloride = $0.20/litre- mixing of chemical by Contractor, cost = $0.10 - $0.30 per m3- (estimated cost of chemical = HK$1,200/mth for 20/m3 18 hour)
- ASIII-10 = 20m3/hr- total capacity = 20m3 x 24hr = 480m3- chemical usage = 480m3 x $0.30/m3 = $144.00 per day- ASIII-40 = 40m3/H- total capacity = 40m3 x 24hr = 960m3- chemical usage = 960m3 x $0.30/m3 = $288.00 per day
Existing drain within construction Existing drain within construction site maintained regularlysite maintained regularly
Maintenance ProgrammeMaintenance Programme
Regular checks on the ECM that have been put in placeRegular checks on the ECM that have been put in place
The checks including the The checks including the
inspection of slope, drain, erosion blanket, silt fence, inspection of slope, drain, erosion blanket, silt fence, curb inlet sediment barrier, sediment tank. curb inlet sediment barrier, sediment tank.
Damage, choke or any problem which cause Damage, choke or any problem which cause ineffectiveness should be recorded and reported.ineffectiveness should be recorded and reported.
The washing bays with sump pump at all The washing bays with sump pump at all entrances/exits must be also properly maintained. entrances/exits must be also properly maintained.
Servicing & repair required for the ECM should be Servicing & repair required for the ECM should be looked into and immediate necessary repair/service or looked into and immediate necessary repair/service or improvement should be carried out with urgency.improvement should be carried out with urgency.
Increase in composition finesIncrease in composition fines
Regulation 4TSS >50mg/l
• $1,000 and
• $2,500 in the case of a second offence
Checklist for Perimeter cut off drain Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Location according to ECM? If no, inform
contractor
2 Construction according to ECM? If no, inform contractor.
3 Any signs of damage? If yes, repair 4 Any signs of inadequate capacity
(ie flooding)? If yes, inform QECP
5 Is obstructing debris or sediment blocking drain? If yes, clear
Follow up action and date of implementation:
Checklist for silt fence Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Installation of silt fence according to ECM? If No,
inform contractor
2 Site fence accumulated >25cm sediment? If yes, clear
3 Is the runoff water running around, above or below the fabric? If yes, fabric is choked and replacement with new fabric required.
4 Is silt fence support steady? If no, rectify 5 Is silt fence torn? If yes, replace 6 Is silt fence properly anchored?
If no, rectify.
Follow up action and date of implementation:
Checklist for silt trap Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Installation of silt trap according to ECM? If No,
inform contractor
2 Is silt trap structure damaged? If yes, repair.
4 Is silt trap fabric torn? If yes, rectify 5 Is silt fence torn? If yes, replace 6 Is silt trap accumulated with sediment >50%
height? If yes, clear.
Follow up action and date of implementation:
Checklist for Stabilization through laying milled waste, lean concreting, installing erosion control blanket or vegetation Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Location according to ECM? If No, inform
contractor
2 Construction according to ECM? If No, inform contractor
3 Any signs of damage for lean concrete areas? If yes, repair.
4 Any signs of damage for milled waste areas? If yes, repair.
5 Any signs of damage for erosion control mat areas? If yes, replace.
6 Any signs of damage for vegetation areas? If yes, replant or replace with suitable material.
Follow up action and date of implementation:
Checklist for Stockpile of topsoil/materials Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Stockpile location and creation according to ECM?
If no, inform contractor
2 Properly protected against erosion? If no, refer to ECM or check with QECP.
3 Properly protected against sedimentation? If no, refer to ECM or check with QECP.
Follow up action and date of implementation:
Checklist for Sedimentation basins Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Location and schedule according to ECM? If no,
inform contractor
2 Details of basins according to ECM?, If no, inform contractor
3 Concentration of effluent (outlet runoff) >50ppm? If yes, inform QECP
4 Sediment filled to within 30cm of water discharge level of outflow structure? If yes, remove sediment.
5 Outlet structure installed as specified in ECM? If no inform contractor.
6 Embankment (if any) protected against erosion? If no, propose measures to protect against erosion.
7 Sedimentation basin inlet chocked? If yes, clear. 8 Sedimentation basin outlet chocked? If yes, clear. 9 Sedimentation basin inlet/outlet scouring problem?
If yes, inform contractor.
Follow up action and date of implementation:
Checklist for wheel wash areas, entrance/ exit points Date of inspection: Check by:
Name of QECP Name of ECO Items Description Yes No Remarks 1 Location according to ECM? If no, inform
contractor.
2 Construction according to details? If no, inform contractor
3 Any signs of damage for concrete (or stabilized) areas? If yes, repair
4 Any signs of sediment spill from these areas into public domain? If yes, investigate.
5 Runoff from wheel wash area channel to suitable areas and properly treated?
Follow up action and date of implementation: