SPECIAL REPAIR REPLACEMENT OF BOREWELL AND OTHER EQUIPMENTS ALONG WITH ALLIED WORKS AT AREA ACCOUNTS OFFICE SILIGURI UNDER GE SEVOKE ROAD

Amount

Material and labour for trial bore of 200 mm dia below ground level in any kind of soil strata incl hard stone/ boulder by deploying reverse rotary or universal method to achieve desired depth including cost of consumable stores like fuel,lubricants, bentonite mud, material and transportation of machinery etc. complete all as specified and as directed by Engr-in-Charge Note: Erection and dismantling of boring plant including all arrangement for the transportation of boring equipment to site of work from the store of contractor at site and back are to be made by contractor at his own cost. All rates should be quoted for supplying the material at site of work.Pits for collection of water and water for drilling tubewell will be arranged by the firm/contractor at site his own cost.

Material and labour for electro logging for identification of aquafier zone with report interpretation, incl fabrication of strata chart in wooden glass frame and strata box of size 1000x600x100mm made by wood shisham and 3mm glass in front of box for display in pump house complete all as specified and directed

Reaming up to 350 mm dia for depth upto 60 m from ground level complete all as specified and directed

Reaming up to 300 mm dia for depth from 60 m from ground level to 130 mtr complete all as specified and directed.

Supply and fixing incl lowering in borewell ERW/ MS casing pipe electric resistant welded pipe with socket confirming to IS:3589 of 250mm dia and thickness 8mm including two coats of anti corrosive bituminous paint of approved brand complete all as specified and as direted.

Supply and fixing incl lowering in borewell ERW/ MS casing pipe electric resistant welded pipe with socket confirming to IS:3589 of 200mm dia and thickness 8mm including two coats of anti corrosive bituminous paint of approved brand complete all as specified and as direted.

All as per item no 6 but slotted pipe as per IS: 8110 strainer complete all as specified and as directed by Engr-in-Charge.

Supply and fixing end cap of for 200mm dia MS pipe complete all as specified and as directed by Engr-in-Charge

Supply and fixing MS reducer socket of dim. 250x200 mm dia to be fabricated out of 12mm sheet plate with the housing pipe of 250 mm dia for fixing 250mm dia MS pipe to 200mm dia MS pipe complete all as specified and as directed.

Supply and fixing well cap of for 250mm dia MS pipe complete all as specified and as directed by Engr-in-Charge

Supply and fixing clamp of size 150mmx10mm of length 1.5mtr including MS nut bolts of 10mm dia and washer etc for supporting casing pipe complete all as specified and as directed by Engr-in-Charge

Supply and fixing clamp of size 150mmx10mm of length 1.0 mtr including MS nut bolts of 10mm dia with washer etc for supporting column pipe complete all as specified and as directed by Engr-in-Charge

Material and labour for plain cement concrete (1:2:4) type B-2 (using 40mm graded crushed stone aggreegate in foundations, filling and mass concrete complete all as specified and as directed.

Supply only column pipe of dia 80mm GI heavy grade with 50mm long deep threaded and 150mm long sockets all as specified and as directed by Engr-in-Charge.

Supply only Steel wire rope, PVC insulated of size 8 mm dia of suitable size/ length as directed with clamps, nuts & bolts and washers etc for holding column pipes / GI pipes of submersible pump set complete all as directed by Engr-in-Charge.

Supply and fixing steel cage fabricated from strips of size 25x4 suitable for protection of submerssible pump set with two coat of anti corrosive black bituminous paint complete all as specified and as directed

Supply and fixing submerssible motor pump set of motor capacity 7.5 HP including lowering of colum pipes, submerssible cable and steel rope tieing with column pipes complete all as specified and as directed by Engr-in-Charge. (Note: (i) Discharge and head of pump will be decided by the Engr-in-Charge as per yield obtained from borewell (ii) Submerssible cable, steel rope and column pipes will be measured and paid in respective items)

Supply and fixing flat submersible cable 3 core multi stranded copper conductor of size 4 sqmm ISI marked complete all as specified and as directed.

Supply and filling pebels of size 6 to 10mm around the casing pipe of borewell including all lead and lifts free from dust dirt or vegetation manure complete all as specified and as directed.

Development of tube well with compressed air and after with 25% extra capacity pump by pumping muddy water of borewell using air compressor of 350psi , 600cfm pressure for required number of hours including fuel etc complete all as specified and as directed.

Conducting following tests for the bore well to determine safe water pumping from government approved laboratory including submitting the report to the department ,complete all as specified & directed: (i) Yield Test (ii) Bacteriological Test. (i) Chemical test (systematic analysis)

Excavation in trenches not exc 1.5 mtr wide and not exc 1.5 mtr in depth for laying pipe line in soft loose soil complete all as specified and directed

Returning, filling in including spreading, leveling, watering and well ramming in layers not exc 25 cm in each layer in soft/loose soil complete all as specified and directed

Removal of surplus soil to a distance not exc 50 mtr and depositing where directed at a level not exc 1.5 mtr above the starting point in any type of soil all as specified and directed

Supply and laying 40 mm outside dia Double Wall Corrugated pipe (DWCPE) ISI marked for enclosing cable below ground/road surface to a required depth including suitable size couplers for jointing of pipe all as per site requirement etc complete all as specified and directed.

Supply, laying, jointing & testing DI (Ductile Iron) Pipe 80mm dia heavy grade with all fittings such as bends, elbow, tee, socket, reducers, unions etc as required at site laid in trenches or above ground from borewell to IRP plant complete all as specified and directed.

Supply and fixing sheet metal enclosure junction box of thickness 3mm sheet , poweder coated with single door closure including 6-way copper bus bar of capacity 100A mounted on PCC (1:2:4) one feet above the ground

Supply and fixing butterfly valve of 80mm dia confirming to IS:13095 including accessories complete all as specified and as directed

Supply and fixing non return butterfly valve of 100 mm dia confirming to IS:13095 including accessories complete all as specified and as directed

Supply and fixing FASD submerssible motor panel starter of capacity 7.5 HP incl overload,single phasing prevention complete all as specified and as directed by Engr-in-Charge.

M&L for Advance encapsulated compound based Chemical earthing CPRI tesed maintenance free , pipe-in -pipe technology upgraded (Zinc coated). , Zinc & Alloy coated (80 -100) microns with pure zinc (99.9%) & Alloy coating (200-250) microns.Earthing system conforming IS 3034. The outer and inner pipe should be 76.2mm and 41.9mm dia respectively of 3 mtrs long zinc coated with with additional special alloy coating 300mm on top side for additional protection of the terminal . The annular space between the pipes to be filled up with Compact fill (CF) (Crystalline Conductive) mixture which should be machine pressed in the pipes not disintegrate or collapse when outer pipe corrodes . The inner pipe should be extended with terminals for connectivity.The job includes digging the pits ,lowering the pipe in pipe earth electrode,filling of pure conductolite back filling compound (BFC Conductolite ) having excellent moisture retaining capacity in 250 mm around the electrode min 4 bags of 25 KG per pit per unit. The BFC should be eco friendly it should not contain environmently hazardous material/metal having ROHS certification from NABL accredited lab.The earth pit should be provided with a FRP earth pit cover for protection and safe guard of terminals. The material of earth electrode should have good electrical conductivity & anti corrosion property in wide range of soil conditions. The job also include M & L for in PCC(1:3:6) type C-1 around the FRP cover for support and foundation and colouring the PCC work with desired colour.complete all as specified and directed. Note :- (i) Design of earth electrode should be of pipein-pipe technology . (ii) Contractor have to submit literature of earth electrode and get the make approved of GE before procurement. (iii) The earth electrode shall withstand short current test for 60kA rms for 1.0 second and 150kA for peak current.

Material and labour for installation of venturi with both side flanged at delivery water pipeline of IRP plant including all accessories and fixtures complete all as specified and as directed by Engr-in-Charge. (Note: cost of venturi is deemed to be included in quoted rate)

Supply installtion testing and commissioning of chlorine feed high pressure dozing pump set with acessories having minimum flow rate of 25 LPH minimum discharge pressure 15Kgs/cm2 and liquid chlorine dozing system consisting of atleast 100ltr FRP tank with accessories and fitted with automatic mixer machine including making connection in main line and fixing arrangement including testing for maintaining 2-3 PPM complete all as specified and as directed.

Supply, installation testing and commissioning of Iron removal (IRP) cum pressure filteration plant of capacity 10,000 Gallon per hour (GPH) with pressure filter size 2000 mm dia and 1800 mm height, with catalytic media, oxidation chamber 1000 mm dia and 1200 mm height with filling of four types of gravels i.e 1"x1 ½ ", 1"x½", ½”x ¼ “, ¼ x 1/8”, two types of sand i.e 10"x30" & 16"x30" and catalytic media Anthracite ¼" x 1/8" & MNO2 as per OEM recommendation including compressor of 700 RPM, single stage, 5HP, 300 Ltrs tank capacity with working pressure 170 PSI for back washing facility including RCC foundation for entire system as per OEM recommdations. The complete layout for pipeline connection and butterfly valves, presuure gauage- 2 Nos, sampling cocks complete all as specified and as directed by engineer-in-charge.

CHANDAN TRADERS (BID ID -3116798)

M/S S.B. CONSTRUCTION (BID ID -3117255)

D.D. BROTHERS (BID ID -3115561)

M S ALOK SAHA (BID ID -3116494)

M/S L N CHOWDHURY (BID ID -3116870)

MARWA CONSTRUCTION (BID ID -3114731)

RAJIV DEY SARKER (BID ID -3110963)