WBIW/EE/KCD2/eNIT-10/2025-26 (Sl No-13)

Earthwork in excavation in the canals / drainage channels / borrowpits / River bed / slope of bank as noted below as per designed section & throwing the spoils in layers of 25 cm. for making banks as per profile or to deposit the same in any other place within an initial lead of 30 metre and initial lift of 1.5 metre including breaking clods, rough dressing etc. complete as per direction of the Engineer-in-charge. (a) Ordinary soil / local soil / soil mixed with moorum or kankar / silt, dry or moist / slushy silt / sticky soil.

Cast-In-situ cement concrete blocks or lining units ar per designed section and specification in nominal mix proportion 1:1.5:3 (Corresponding to M20 grade) with well graded 20 mm down stone metal aggregate, laid in position by casting in alternative panels or othersise to keep a gap of 12 mm between the adjuscent units, over a layer of polythene sheet of thickness not less than 100 µm to act as a separator between the bottom surafce of the block and the sand cushion / filter material laid below the blocks, including, dressing, ramming, shuttering, finishing the exposed surface by trowel without adding any additional cement and sand mortar, curing and filling the gaps between adjucent units by 5.6 mm down coarse aggregate to be compacted properly with all leads and lifts including supply and carriages of all materials without the cost of sand cushion/filter (The rate is exclusive of the cost of stone aggregate and its carriage upto site. Construction wing has to add the cost of same from the SoR of PW(Roads) to derive the consolidated rate. Consumption chart of the USoR may be used for assessing the quantity of coarse aggregates per cum of concrete). Stone aggregate of pakur or Rajamahal or Broken stone of North bengal varieties.

Ordinary Cement concrete (mix 1:1.5:3) with graded stone chips (20 mm nominal size) excluding shuttering and reinforcement if any, in ground floor as per relevant IS codes. Pakur variety

Dismantling all types of plain cement concrete works, stacking serviceable materials at site and removing rubbish as directed within a lead of 75 m. In ground floor including roof. (a) upto 150 mm. Thick

Sand filling in foundation trenches and at the back of abutments, wing-walls etc. with good local sand free from earth in layers not exceeding 15 cm. including inundating each layer by profuse water and poking and ramming layer by layer complete including supply of sand. Quality of sand is to be approved by the Engineer-in-charge.

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