Proposed Reclamation at Tuas Finger One Specifications : Caisson Scheme (Base Offer and Alternative Offer No. 1, 2 and 3) Section 10 : Hydrographic and Land Surveys

SS10-BASE&ALT1,2,3/2

10.3. RESPONSIBILITY FOR SURVEY DRAWINGS

The Contractor shall submit in writing to the Superintending Officer for approval the name of the Registered Surveyor who is authorised to endorse and certify, on behalf of the Contractor, on all survey matters for the Works.

All survey Drawings, document and reports submitted by the Contractor to the Superintending Officer's shall be stamped and endorsed by the approved Registered Surveyor. The Contractor shall be solely responsible for any discrepancy, error or omission in survey Drawings whether such Drawings have been approved or not by the Superintending Officer.

10.4. SCHEDULE OF SURVEY WORKS

The Contractor shall incorporate the schedule of all survey works, including, but not limited to, pre- and post-construction surveys, control surveys, hydrographic, side scan sonar and sounding surveys, post dredging, excavation and filling surveys, profiling sonar surveys, land surveys, remote sensing imaging, magnetometer survey, as-built survey, into the Construction Programme under the Contract.

All surveys and submission of relevant plans shall form part of the Works under the Contract and shall be completed within the Time for Completion. The Contractor shall submit a comprehensive work schedule for the survey works for approval by the Superintending Officer. The comprehensive work schedule shall tie in with the time frame indicated in the overall Construction Programme.

10.5. SURVEY DATUM

All levels referred to in this contract shall be based on the Chart Datum (MPA). The Singapore Land Authority (SLA) Precise Levelling Datum (PLD) (0.00m Mean Sea Level) shall be 1.741m above the Chart Datum following the Tuas Tidal Station. The Contractor however shall allow for the provision to produce Drawings in the Singapore Land Authority Precise Levelling Datum (0.00m Mean Sea Level) as and when requested by the Superintending Officer in his Contract Sum and no claims whatsoever shall be entertained by the Employer.

The horizontal datum shall be based on the SVY21 datum and linked to the Singapore Land Authority (SLA) Integrated Survey Network (ISN). The Contractor however shall allow for the provision to produce Drawings in other Datums as and when requested by the relevant Authorities or Superintending Officer in his Contract Sum and no claims whatsoever shall be entertained by the Employer.

10.5.1. 2.515 m High Water Mark Line

The Contractor shall determine the 2.515 m High Water Mark (HWM) based on nearby bench marks established by the Singapore Land Authority (SLA) or other bench marks approved for use by the Chief Surveyor. The bench marks shall be proven to be in position prior to use. The 2.515 m HWM must be surveyed by levelling method and double-checked by radiation. The permissible closing error of the levelling for such purpose shall not exceed 15 k millimetres where k is the length of the level line in kilometres. The reduced level of the 2.515 m HWM shall be 0.960 metre above the Precise Levelling Datum (PLD) adopted by the Singapore Land Authority, being Mean Sea Level. A sketch showing the surveyed HWM demarcated on the ground and listing showing its coordinates in SVY21 datum or any other datum as specified by the Superintending Officer shall be submitted by the Contractor's Registered Surveyor with certification and date.

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