Water Cleaning of Water Tank Under Ground and Overhead PVC Tank installed at Govt. Model Senior Secondary School Timber Market Police Line Sector-26 Chd, Govt. Middle School Bapu Dham Colony, Govt. Primary School Bapu Dham Colony Sector-26, U.T. Chd.

12 mm cement plaster of mix :13.4

1:4 (1 cement: 4 coarse sand)13.4.1

Cleaning of under ground sump, Over Head R.C.C. Tank ( independent staging) including disposal of slit and rubbish, all as per direction of Engineer-in-Charge. The cleaning shall consist following operations:- (i)Tank shall be emptied of water by pumping & bottom shall be cleaned of silt and other deposits. (ii) Entire surface area of the sump shall then scrubbed thoroughly with wire brush etc. and pressure washed with water. (iii) Chlorination of RCC internal surface by liquid chlorine. (iv) The treated surface shall be dried using air jetting and all loose particles shall be removal from the surface. (v) Finally the surface shall be treated with ultraviolet radiation etc. as per direction of Engineer-in-Charge.14.78

Disconnecting damaged overhead /terrace PVC water storage tank of any size from water supply line and removing from the terrace including shifting at ground level as per direction of Engineer-in-charge.14.79

Dismantling old plaster or skirting raking out joints and cleaning the surface for plasterincluding disposal of rubbish to the dumping ground within 50 metres lead.15.56

Providing and placing on terrace (at all floor levels) polyethylene water storage tank, IS : 12701 marked, with cover and suitable locking arrangement and making necessary holes for inlet, outlet and overflow pipes but without fittings and the base support for tank.18.48

Providing and fixing PTMT Ball cock of approved quality, colour and make complete with Epoxy coated aluminium rod with L.P./ H.P.H.D. plastic ball.18.62

20 mm nominal bore, 120 mm long, weighing not less than 198 gms18.62.2

Providing and fixing in position pre-cast R.C.C. manhole cover and frame of required shape and approved quality19.19

Square shape 450 mm internal diameter19.19.2.1

Circular shape 560 mm internal diameter19.19.3.1

Cleaning of storage water tanks with 6 stage process mentioned as under:-NSR

Mechanized Dewatering

Desiliting & Removal of left out dirty water & sludge with sludege removal pump(i)

Cleaning of walt, ceiling & floor by high pressure water jet with the help of equipments which reates a presure of 100-250 bar.(ii)

Removal of remaining sludge from the floor with the help of industrail vaccum cleaner(iii)

Spraying of non-toxic, biodegradable Eco-friendly antibacterial agent to disinfect the tank from all harmful pathagens of approval make:- KMON4, Pottasium permagnate.(iv)

Treatment of inside the tank by exposing UV Radiation to kill further suspended or floating Bacteria if any(v)

PVC tank:-(vi)

Providing and fixing of tank nipple complete in all respect.NSR

Providing and fixing of PVC Tank Cover 2000/1000/500/300 Litre capacityNSR

20 mm dia