GE/ALP (8721) KOLKATA OF 2026-27

M&L for boring of borewell of 300 mm dia in any type of soil including rocky strata/boulders etc up to depth of 100 meter below ground level for laying casing pipe and prescribed, including collecting samples from different strata, preparing and submitting strata chart, recording water level, including hire & running charges of all equipments, tools, plants & machineries required for complete job, complete all as specified and directed.

M&L for gravel packing tubewell construction in accordance with IS:4097 (Part-I) including supplying and pouring graded gravel in annular space around the well pipe after development and pumping test as per actual requirement complete all as specified and directed. Note: The gravel shall be of hard, durable, rounded pebbles of 2–5 mm thickness and free from impurities. Gravel is to be tapped cement impermeable clay zone.

Supplying, assembling, lowering and fixing in vertical position in bore well, PVC vertical casing pipe 150 mm dia, confirming to ASTM D-1785/IS 12818 and wall thickness as per Schedule 80 pipe of 150mm nominal dia, made of best quality, including required thread and labour charges, fittings & accessories etc. complete all as specified and directed.

Supplying, assembling, lowering and fixing in vertical position in bore well, Fibre Glass Filter 150mm nominal size dia 6mm wall thickness (min) conforming to ASTM D-1785/IS 12818, made of best quality materials including required hire and labour charges, fittings & accessories etc. complete all as specified and directed.

M&L for reducers, bailplug, well cap, MS strip for centering, MS iron clamps, all sorts pieces, electrologging and sample strata box etc., complete all as specified and directed.

M&L for providing, constructing, testing and commissioning complete rain water harvesting system for groundwater recharge comprising excavation of recharge pit of size not less than 4'0' x 4'0" x 5'0" depth in any type of soil, providing RCC 1:2:4 (nominal mix) Type B1 using 20 mm graded stone agrregates as in walls 75mm thick, filling the pit with graded filter media consisting of coarse sand, graded gravel and stone pebbles in layers, providing and constructing silt trap/filter chamber of suitable size with brick masonry, internal plastering and RCC cover, all as per standard practice complete all as specified and directed. Note: All connected works related with chamber, its connection, etc. are deemed to be included in the quoted unit rate.