WBIW/SE/EC/NIT-06(e)/ 2022-2023/SL-6

Beyond 500 metre and upto 1.00 km.

Beyond 1.00 km. upto 2.00 km.

Beyond 3.00 km. upto 4.00 km.

Earthwork in making new embankment / ring bundh/ retired embankment by excavation of earth from borrow pits in all kinds of soil including making berms and depositing the same in layers not exceeding 25 cm. as per profile within an initial lead of 30 metre and lift of 1.5 metre including cost of nicking outlines, dug-belling, putting profiles, cutting and removing thick and thorny jungles, uprooting trees and stumps of all sizes upto 30 cm., girth from the site alignment as per direction of the Engineer in-Charge including dewatering, removal of weeds, carcasses, organic matter etc., if any, breaking clods, rough dressing, watering, ramming, compacting etc. complete. (Work to be executed on section measurement by pre-work & post-work level section). A) Where land for earth owned/arranged by the Department.

Earthwork from borrow pits over existing embankment or for repairs to embankment, closing breaches etc. within an initial lead of 30 metre and lift of 1.50 metre including breaking clods and depositing the same in layers not exceeding 25 cm. and rough dressing etc. complete as per profile.

Compacting earth work in embankment in layers of 25 cms. by power roller or by any other mechanical means, like tractor driven sheep foot roller/vibrating plate compactor earth rammer etc.( Not at OMC) including necessary watering, labour charges, hire charges, hire charges of all materials, tools & plants etc. and including cost and supply of all materials complete as perdirection of the Engineer-in-charge.( Payment will be made on the basis of Pre-works & Post-work level).

Earthwork in excavation of foundation trenches or drains, in all sorts of soil (including mixed soil but excluding laterite or sandstone) including removing spreading or stacking the spoils within a lead of 75 metre as directed. The item includes necessary trimming the sides of trenches levelling, dressing and ramming the bottom, bailing out water as required complete. A) Upto depth not exceeding 1.5 M.

Making filter with well graded 40 mm. down ballasts and laying uniformly behind weep holes, below pitching on bed, side slopes including supply and carriage of all materials to site including preparing bed with earthwork up to 30 cm. depth, where necessary and compacting with wooden malllet after laying to achieve designed section as per direction of the Engineer-in-Charge (measurements will be on finished work /in stack after deducting necessary void). A) 1st. class Brick Ballast.

Cast-in-situ cement concrete blocks or lining units as per designed size and specification, with well graded stone metal aggregate, laid in position by casting in alternative panels or otherwise to keep a gap of 12mm between the adjacent units, over a layer of polythene sheet of thickness not less than 100 m to act as a separator between the bottom surface of the block and the filter material laid below the blocks, including dressing, ramming, shuttering, finishing the exposed surface with 1:3 cement and sand mortar, curing and filling the gaps between the adjacent units by 5.6 mm down coarse aggregate to be compacted properly, with all leads and lifts including supply and carriage of all materials, complete, without the cost of 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). A) With Stone aggregates (Pakur, North Bengal or Rajmahal varieties). i) Nominal Mix 1:1.5:3 with 20 mm. down coarse aggregate.