providing ring well at cauvery river headworks in vengarai town panchayat ; 1 earthwork excavation above water levelin light or sandy soil for infiltration well of 2.50 m dia ( internal ) including leveling the site and as directed by depatmental twad board officers for first depth of 1.0 m 2 supply and delivery of rcc ring at 2.50 m internal dia and 0.30m depth including all cost and conveyance etc., complete 3 sinking well of 2.50m internal dia below waterlevel including all incidental charges in loose / sandy soil and silt ( or ) clay pocket using special tools and plants such as air compressor helmet etc. including bailing out water complete as per standard specifications. 4 loose / sandy soil 5 1st depth of 2.00m 6 2nd depth of 2.00m 7 3rd depth of 2.00m 8 4th depth of 2.00m 9 supplying and fixing of dia 2.70 m x 100 mm thick rcc pre cast slab in rcc 1:1 1 / 2:3 mix including cost of reinforcement grill but including moduling, finishing watering curing and fixing in position etc., complete as per std., specifications.,