BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

control works including in-situ soil density tests, moisture content and otherlaboratory testing to ensure that all materials used in the embankment or fillingelsewhere are compacted in accordance with the specified requirements.The maximum dry density (MDD) for the purpose of this specification shall bedetermined by the following procedures or equivalent.a. Selected materials used in the embankment other than below buildingsshall be compacted to a density not less than 95% MDD.b. Sub-grade for road below formation level to a depth 650mm shall becompacted to a density not less than 95% MDD or as approved by theBoard.c. Location of buildings and equipment foundations shall be compacted to adensity not less than 95% MDD or as approved by the Board.The following standards tests (any one) shall be conducted for determination ofMDD.(1) Standard Proctor Method(2) Modified AASHTO Test17.3.4 BACKFILLINGThis section shall apply to the performance of all work in connection with therequired backfill for the permanent works.(1) MaterialMaterial for backfill shall be obtained from excavated soil or other sourcesapproved by the Board(2) WorkmanshipBackfill to all foundations trenches, pits, etc., shall not be placed until the workhas been inspected and approved Backfill around sewers, water mains and otherutility lines shall be carefully placed so that the piping will not be displaced ordamaged. Fill in contact with pipes shall be entirely free of rocks. Backfill aroundservice pipe shall be of sandy material. The backfill shall be compacted atoptimum moisture content in layers not exceeding 15cm to 92% of the maximumdry density. Compaction shall be carried out by vibratory plate compactor.17.3.5 MEASUREMENT AND PAYMENT(1) Land reclamation worksMeasurement by volume, for the payment of filling for the land reclamation worksshall be made on the basis of the original ground surf ace and the site formationlevels shown on the approved drawings. The quantity of filling given in theSchedule was estimated for Tendering purposes. If the final quantity of the fillingwork varies beyond 10 (ten) percent, the Contractor shall notify the Board forGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)161