Borewell & Tubewell Works Tenders

Construction of granular sub base by providing well graded material mixing in mechanical mix plant carriage of mixed material to the work site, spreading in uniform layer with motor grader on prepared surface and compacting with smooth wheel roller to achieve desired density

a Supplying, assembling, lowering and fixing in vertical position in bore well,unplasticized PVC medium well casing (CM) pipe of required dia, conforming to IS: 12818-2010, including required hire and labour charges, fittings & accessories etc. all complete, for all depths, as per direction of Engineer – incharge.:200 mm nominal size dia. for four borewells mts 1 6

Development to the tube well in accordance with IS: 2800 (Part 1) and IS: 11189 to establish maximum rate of usable water yield without sand content (beyond permissible limit) with required capacity air compressor, running the compressor for required time till well is fully developed measuring yield of well by “V” notch method or any other approved method, measuring static level and draw down etc., by step draw down method collecting water samples and getting tested in approved laboratory. Job includes disinfection of tube well all complete including required hire & labour charges of air Compressor tools and accessories etc. all as per direction of Engineer-in-charge. The grouting and sealing of tube well has to be done to ensure safe sanitary conditions. An apron around the well (mix of M10 grade) and sloping away from it to protect the well from pollution to be constructed to prevent contaminated water flowing back into it. The casing pipe has to be anchored within the apron by welding ISMC-150 steel bracing with cleats and sufficient welding area. 2 meters length each bracing embedded within the apron (4 bracings). The complete well thus completed handed over to the territorial Mechanical Division for harnessing. Technical Specifications: Minimum Run for compressor — 40 Hrs. Yield Test for water (till desired results) — Min 30 Hrs. i. Apron Size — 2.5 mtr × 2.5 mtr ii. Apron depth at skirt — 300 mm iii. Apron depth at well casing — 350 mm