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INSPECTION REQUEST FORM FOR SUBGRADE CONSTRUCTION NO:

Unless otherwise approved,this inspection request form shall be submitted during the daily

morning meeting among LTA,Contractor and QP(S)

Contractor: Project:

To: Date:

Time:

The work described below has been inspected by our Site engineer and is complete

and ready for your inspection. A checklist is attached overleaf.

Location

Checked and Requested By:

Chainage

Activity

Drawings Used for Construction

Other DescriptionContractor's PM Name & Signature

*delete where appropriate

INITIAL INSPECTION DECISION BY QP(S)

We have inspected the above referenced works and found them acceptable. You may proceed.

However, please return the completed checklist upon completion of the remaining work.

You cannot proceed. Please carry out corrective works as noted on the checklist and

submit a fresh request for inspection.

Other comments:

RTO/RE Name & Signature/ Date

FINAL INSPECTION DECISION BY QP(S)

LTA

___________________________

LTA's Representative/Date/Time

QP(S) Name & Signature/Date

work approved to start:___________________ work completed on:__________________________

The above process for request for inspection of work by Contractor and approval by QP(S) is noted.

SAMWOH CORPORATION PTE LTD SK E&C

ER296-CONSTRUCTION AND COMPLECTION OF SENTOSA GATEWAY

TUNNEL FROM TELOK BLANGAH ROAD TO KEPPEL ROAD /

KAMPONG BAHRU ROAD/ LOWER DELTA ROAD AND ASSOCIATED

ROAD WIDENING WORKS INTERCHANGE

The meeting noted that the information provided by the Contractor is adequate/not adequate*.

QP(S) may proceed Request Rejected

__________________________________________

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Location:

S/No Description of Works Checked by Confirmed by

Contractor QP(S)

1 Send properly labelled soil samples for last 500mm of subgrade for the following tests

1.1 Maximum Dry Density

1.2 California Bearing Ratio (CBR)

2 Ensure soaked CBR conform to specifications

3 Check formation levels of subgrade

4 Provide proper drainage for subgrade surface

5 Conduct field density tests (TABLE A)

6 Continue mechanical compaction until in-situ test results conform to specifications

7 Check sufficient temporary traffic devices if lane closure is required

8 Others

TABLE A

1 Chainage : m A B C D E F

2 Wt of soil from hole g

3 Wt of sand (+ cylinder ) before pouring (M1) g

4 Wt of sand (+ cylinder ) after pouring (M4) g

5 Wt of sand in hole (M5 = M1 - M4 - M2 ) g

6 Ratio = Mw/M5

7 Bulk density of sand Pa Mg/m3

8 Bulk density of soil P = (Mw/M5)xPa Mg/m3

9 Moisture content (w) %

10 Dry density Pd = 100P/(100+w) Mg/m3

11 Max. dry density Mg/m3

12 Optimum moisture content %

13 % of compaction

14 Remarks

Calibration (* Cylinder*)

*Mean of sand in core g

(of pouring cylinder) (M2)

Volume of calibrating container (V) mL

*Wt of sand (+ cylinder)

before pouring (M1) g

*Wt of sand (+ cylinder)

After pouring (M3) g

*Sand to fill calibrating container

(Ma = M1 - M3 - M2) g

Bulk density of sand Pa = Ma/V Mg/m3

CHECKLIST FOR SUBGRADE CONSTRUCTION NO:

Date/Time: Chainage: