REASONS FOR FAILURE

• OGL = RL +3.00 (lower area) not RL +4.00

• Slope gradient steeper than 1 : 2

• Area filled to RL +5.50

• Stability check indicates embankment is not stable

REMEDIAL MEASURES

• Fill height lowered to RL +4.90

• Slope gradient to be trimmed to 1 (V) : 3 (H)

Date of incident : 20 September 2004Location : Southern Boundary

Date of incident : 11 and 15 October 2004Location : Southern, Northern and Western Boundaries

ItemItem Type of Type of FailureFailure

Date of Date of FailureFailure

Surcharge Surcharge LevelLevel

RemedialRemedial

SouthernSouthern Ground Ground DistressDistress

11-10-200411-10-2004 RL +4.90RL +4.90 RL +5.80RL +5.80 RL +6.20RL +6.20

RL +4.40RL +4.40 RL +5.70RL +5.70 RL +5.70RL +5.70

NorthernNorthern Tension Tension CracksCracks

15-10-200415-10-2004 RL +6.40RL +6.40 RL +6.60RL +6.60

RL +6.00RL +6.00 RL +6.40RL +6.40

WesternWestern Tension Tension CracksCracks

15-10-200415-10-2004 RL +6.60RL +6.60 RL +6.40RL +6.40

REMEDIAL MEASURES Maintain embankment slope 1 : 3

Temporary surface drain to avoid water ponding on surcharge fill

Crack to be immediately sealed to reduce infiltration of surface water

Coordinate with surrounding developers to minimize adverse condition on the stability of surcharge fill

REASONS FOR FAILURE OGL = RL +3.00 (lower area) not RL +4.00

Tremendous development at surrounding area which partly contributed impact on the subsoil and ground water regime

Under wet condition (heavy rains), the embankment fill is likely to lose its strength and tension cracks tend to pose instability problems

The southern side is located at the lowest GL next to Sg.Hitam. The subsoil condition is likely to be worse than the interpreted subsoil conditions for the entire site.

GROUND DISTRESS AT SOUTHERN BOUNDARY

TENSION CRACKS AT SOUTHERN BOUNDARY

TENSION CRACKS AT NORTHERN BOUNDARY