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ER 288-SQN-051

SECTION A - QP (s)

ToOKP cc LTASubject of SQN: Driven Piles Penetration Length at POB2 (Southbound)

Date to Reply / Taken Action By: We found that the pile penetration length for POB2 (Southbound) significantly differ from construc-tion drawing requirement (Please find the attached Annex A.) as per BCA requirement, for driven piles any reduction in penetration

more than 20% will be considered as material change in piling works and further QP(D) has to submit the amendment piling plan

before construction (please find attached BCA circular). We seek your immediate response on this issue, further don't proceed any

works on these piles until this issue is satisfactory resolve.

Issued By: QP(s) Acknowledge by: OKP

Wong, RE 30/03/2010 Law Hai Wee, Planning Manager, 01 Apr 10

Name, Position, Signature, Date & Time Name, Position, ER288, Date & Time

SECTION B - Main Contractor OKP

OKP Report/Reply: ( Attachments : )1) As per BCA guideline on submission of amendment and record piling plans, clause 7(d)(ii), the reduction in pile length of more than

20% or any other reduction in length had been assessed duly by the QP(D) on the allowable pile capacity.

2) Please refer to PDA test reports in OKP/ER288/LTA/09-621 dated 5 April 2010 for PC4SB3-2 and OKP/ER288/LTA/09-637 dated 14

April 2010 for PC6SB8-1. Extracts of the results could be found in Attachment 1.

3) As per the test reports, QP(D) is satisfied that the reduction in pile length had no structural implication on the allowable pile capacity.

4) Please note that for any driven piles, the "material changes", in relation to pile length deviation of more than 20%, could only be

determined after the piling work had been carried out.

5) Hence, as advised by QP(D) (see Attachment 2), we'll submit the driving formula used for the works to BCA with the

as-built records as amendment plans, as to satisfy BCA requirements for "material changes".

Reply By:

Gillian Guo, Project Engineer, 14 Apr 10

Law Hai Wee, Planning Manager, 15 Apr 10

Name, Position, Singature, Date & Time

SECTION C - QP (s) Safety Quality Status

SQN Report Status:

(1) The SQN is closed/ Need further report *

(2) Notes: -

RE/RTO

Name, Position, Singature & Date (QP(s) representative)

( * ) Delete where not appropriate

SAFETY / QUALITY NOTE Date 30 Mar 10

Project : ER288 Widening of CTE from PIE to Braddell Interchange Page No.

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DRIVEN PILE RECORDS

Contract No.:

Contractor:

Project

Type of Pile: RC Pile & H Pile Type of Hammer: Hydraulic

Size of Pile: Drop of Hammer: Weight of Hammer 5 tonnes Location

a b c = a - b d e

Pile Pile Pile Length Total Above(+) Penetr- Existing Cut-

S/No Date Group No Length Below(-) ation Ground Off

1st 2nd 3rd 4th 5th 6th (m) G.L. (m) (m) Level (m) Level (m

Brought

1 13-Mar-10 PC4 SB3-1 10 10 6 - - - 26.000 4.400 21.600 105.150 103.55

2 13-Mar-10 PC4 SB3-2 10 8 8 - - - 26.000 5.000 21.000 105.150 103.55

3 15-Mar-10 PC4 SB3-3 10 8 6 - - - 24.000 2.200 21.800 105.150 103.55

4 15-Mar-10 PC4 SB3-4 10 8 6 - - - 24.000 2.300 21.700 105.150 103.55

5 16-Mar-10 PC4 SB4-1 10 8 8 - - - 26.000 5.500 20.500 105.270 103.79

6 17-Mar-10 PC4 SB4-2 10 8 6 - - - 24.000 4.200 19.800 105.270 103.79

7 18-Mar-10 PC4 SB4-3 10 8 6 - - - 24.000 4.000 20.000 105.27 103.79

8 19-Mar-10 PC4 SB4-4 8 8 6 6 6 - 34.000 4.000 30.000 105.27 103.79

9 20-Mar-10 PC2 SB7-2 10 8 8 - - - 26.000 4.000 22.000 105.4 104.23

10 22-Mar-10 PC2 SB7-1 10 8 8 - - - 26.000 3.500 22.500 105.4 104.23

11 22-Mar-10 PC2 SB6-2 8 8 8 - - - 24.000 3.000 21.000 105.35 104.11

12 23-Mar-10 PC2 SB6-1 8 8 8 - - - 24.000 3.300 20.700 105.35 104.11

13 23-Mar-10 PC2 SB5-1 8 8 8 - - - 24.000 4.500 19.500 105.3 103.96

14 24-Mar-10 PC2 SB5-2 8 8 6 - - - 22.000 3.200 18.800 105.3 103.96

15 26-Mar-10 PC6 SB8-3 12 12 - - - - 24.000 1.300 22.700 105.5 104.3

16 27-Mar-10 PC6 SB8-5 12 12 - - - - 24.000 0.800 23.200 105.5 104.3

17 27-Mar-10 PC6 SB8-6 12 12 - - - - 24.000 1.500 22.500 105.5 104.3

18 27-Mar-10 PC6 SB8-4 12 12 - - - - 24.000 0.500 23.500 105.5 104.3

19 29-Mar-10 PC6 SB8-1 12 12 - - - - 24.000 1.000 23.000 105.5 104.3

20 29-Mar-10 PC6 SB8-2 12 12 - - - - 24.000 0.800 23.200 105.5 104.3

21 30-Mar-10 PC2 SB9-1 8 8 8 - - - 24.000 2.400 21.600 105.05 103.50

ER288OR KIM PEOW CONTRACTORS PTE LTD

WIDENI

INTERCH

250 by 250 & 255 by

255

350mm(RC

) and

540mm(H-

Pile)

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