REPAIR / MAINT / IMPV OF EXTERNAL WATER SUPPLY SYSTEM, CLEANING OF WATER RESERVIOR AND ALLIED WORKS AT LEBONG UNDER AGE(I) DARJEELING

Amount

M&L for Cleaning of semi under ground RCC sump of capacity 50000 gallons throughly removing mud, grits, vegitation etc. from the sump inner and outer side, complete all as specified and directed by following method: - (a) Drain out the water by using exist valve/high capacity dewatering system. (b) Cleaning inside of the tank by using TERBACK G10 chemical and scrubbing the wall of the tanks. (c) Fresh water cleaning by high speed jet pump. (d) First Bacteria Screening is sterilization by using TERBAC G5. (e) Cleaning the floor of the water tank by heavy duty industrial vacuum cleaner. (f) Second Bacteria Screening is sterilization by using Ultraviolet ray. (f) Third Bacteria Screening is sterilization by using TERBAC G65. (g) Cleaning of outer side by removing scales, vegitables, moss etc as directed.

All as above item No. 1.00 but in capacity 30,000 Gallons.

All as above item No. 1.00 but in capacity 25,000 Gallons.

All as above item No. 1.00 but in capacity 10,000 Gallons.

All as above item No. 1.00 but in capacity 5,000 Gallons.

All as above item No. 1.00 but above ground Steel tank of capacity 30000 gallons.

All as above item No. 1.00 but above ground Steel tank of capacity 9000 gallons.

All as above item No. 1.00 but above ground SMC tank of capacity 5000 gallons.

All as above item No. 1.00 but above ground RCC sump of capacity 4000 gallons.

All as above item No. 1.00 but above ground PVC/RCC tank of capacity 10000 Litre.

All as above item No. 1.00 but above ground PVC/RCC tank of capacity 5000 Litre.

All as above item No. 1.00 but above ground PVC/RCC tank of capacity 2000 Litre.

M & L for periodical maintanance of Pressure Filter Plant 35 Cum/Hr by dismantling of GI/MS pipe connections, opening manhole and removing/taking out old filter medias i.e. sand, gravels, PVC stainers etc and cleaning serviceable filter media by washing properly removing dirts/muds etc and staking them after segrigation process for refilling in the tank incl replacement of unserviceable PVC stainer as required and refixing pipes, manhole cover etc to existing position using new gasket, tightening of nuts & bolts, washers etc after refilling of serviceable gravells/sand media with new gravells/sand media and disposed off old unserviceable gavels/sand at a distance not less than 100m from site, complete all as specified and directed. Notes:- (a) PVC strainers shall be paid and measured seperately under relavent item as 'Supply only' here-in-after. (b) Refilling of filter media shall be measured under relavent item here-in-after.

M & L for filling of gravel of size 20mm to 12mm on the filter bed of the pressure filter uniformly after washing/cleaning to remove dust, dirts etc. in layers, complete all as specified and directed.

M & L for filling of gravel of size 12mm to 06mm on the filter bed of the pressure filter uniformly after washing/cleaning to remove dust, dirts etc. in layers, complete all as specified and directed.

M & L for filling of gravel of size 6mm to 03mm on the filter bed of the pressure filter uniformly after washing/cleaning to remove dust, dirts etc. in layers, complete all as specified and directed.

M & L for filling of gravel of size 3mm to 1.5mm on the filter bed of the pressure filter uniformly after washing/cleaning to remove dust, dirts etc. in layers, complete all as specified and directed.

M & L fresh sand (Barakar River sand) of size 0.35mm to 0.5mm and co-efficient of uniformity shall be between 1.3 to 1.7 and silica content should be not less than 90%, filling in layers as filter bed, complete all as specified and directed.

M & L for anthracite compound (carbofilt of RMCO) of size 25mm to 12mm suitable for removing tubidity and bad odour from raw water, complete all as specified and directed.

Supply only PVC strainer for pressure filter, complete all as specified and ditected.

M & L for painting to internal surface of the Pressure filter chamber/steel tank/RCC tank etc. with two coats of black bituminus paint (Lead free) suitable of drinking purpose after necessary surface preperation by means of scraping, brushing etc., complete all as specified and directed.

M&L for preparation of old steel surfaces of any description over 10 cm width or girth and applying one coat of synthetic enamel paint over a coat of red oxide zinc chromate primer, complete all as specified and directed.

Preparation of old painted surface of brick/stone/plaster surface plain or moulded, n exc 10cm width or girth and painting by one coat of 1st quality Synthetic enamelled paint, over a coat of priming paint plaster coat, complete all as specified and directed.

M&L for rough excavation in slit/ sand/ shingle/ gravel boulder in hilly stream source, re-diverting and re-aligning tha intake point for river stream including dissposal off excaveted materials on the bank at a distance n.exc 10m etc. including all allied T&P, protection tools, complete all as specified and directed.

M&L for cleaning of slit and mud clay mixed with sand, shingle, gravels etc from the collector pond with using suitable arrangement whenever necessary including cleaning of choked/partially choked intake pipes and sedimentation tank including all allied T&P, protection tools and disposed off at a distance not less than 50m, complete all as specified and directed.

Demolition of cement concrete (unreinforced) in ground floor and pavings not exc 15 cm thickness (below or above ground level), complete all as specified and directed.

M&L for hardcore using broken stone or boulders of gauge n exc. 63mm, deposited, spread and levelled in layers n exc. 15 cm thick, watered and rammed to a true surface, complete all as specified and directed.

M&L for plain cement concrete (1:4:8), type D2 (using 40 mm graded stone aggregates) as in foundation, filling and mass concrete and staging of MS tank/PVC storage tank box repair to floor, path including necessary form work and fair finishing without using extra cement, complete all as specified and directed.

S&F of rotational moulded polyethylene water storage tanks of capacity 2000 litres (cylindrical vertical with closed top) hoisted and fixed in position all as specified in SSR Part-l and directed.

M&L for brickwork with fly ash bricks (old size bricks), in one brick thick honey-comb walling, built in cement mortar(1:6), complete all as specified and directed.

M&L for brickwork with fly ash bricks (old size bricks), straight or curved on plan exc 6m mean radius, built in cement mortar(1:6), complete all as specified and directed.

M&L for rendering 15mm thick in cement mortar (1:4) on fair faces of brick work or concrete surfaces, finished even and smooth (without using extra lime or cement), complete all as specified and directed.

Collection Bacteriological and Chemical Testing of water samples from Govt/Authorised Lab, complete all as specified and as directed.

M&L for painting of water distribution header including all control valves and all exposed pipe of any size by using synthetic enamelled painting after scrapping /cleaning, complete all as specified and as directed.

Note 1:- (Applicable for all parts/items) : The bidders/contractors are advised to read tender document, all drawings & all corrigendum / amendments and general condition of contracts before entry / quoting the rates. Note 2:-The contract sum shall be arrived at after deducting amount of schedule of credit from the total quoted amount.

Damdoo Bhutia (BID ID -3126917)

RAI CONSTRUCTION (BID ID -3125722)

Darjeeling Enterprises (BID ID -3125629)

TSHERING WANGYAL BHUTIA (BID ID -3127008)