Public Health Engineering Department Tender

Gravel packing in tube well construction in accordance with IS:4097, including providing gravel fine/medium/coarse in required grading and sizes as per actual requirement all complete as per direction of Engineer–in-charge. "30 Cum Each"

Supplying, assembling, lowering and fixing in vertical position in bore well, ERW (Electric Resistance Welded) Fe 410 mild steel screwed and socketed/plain ended casing pipes of required dia, conforming to IS :4270 of reputed & approved make, including painted with outside surface with two coats of anticorrosive paint of approved brand and manufacture including required hire &labour charges, fitting and accessories, all complete for all depths, as per direction of Engineer–in-charge. 250mm nominal dia having wall thickness 7.1 mm with allowable tolerance. (The length of the casing pipe may increase or decrease at the time of execution of work as per the approved Casing Diagram). "120 Mtr Each"

Supplying, assembling, lowering and fixing in vertical position in bore well, ERW (Electric Resistance Welded) Fe 410 plain slotted (having lot of size 1.6/3.2mm) mild steel threaded and socketed/ Plain bevel ended pipes (type A) of required dia, conforming to IS :8110 of reputed & approved make having wall thickness not less than 7.1 mm with allowable tolerance including painted with outside surface with two coats of anticorrosive bitumastic paint of approved brand and manufacture including required hire &labour charges, fitting and accessories, all complete for all depths, as per direction of Engineer–in-charge. 250mm nominal size dia. (The length of the casing pipe may increase or decrease at the time of execution of work as per the approved Casing Diagram). "30 Mtr Each"

Development to the tube well in accordance with IS: 2800 (Part1) 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. The well casing shall be anchored with ISMC-150 and CC-Block. The CC-Block shall be laid of size (2x2x1) meter in M-15 mix, excluding the annular Dia of the well and slopping away from it to prevent contaminated water flowing back into it. The casing pipe has to be anchored by welding ISMC-150 steel bracing of 2-meters length each (04 no. bracings or channels)with cleats and sufficient welding area, bracing embedded within the CC-Block as per the directions of the Site Engineer. "01 Job Each"