supply and laying of filter media supply and laying of filter media with required maintenance item and for filter bed and removing of old filter media at site of 2 mgd filter plant borvan and 1 mgd filter plant behta gaon under zone no . 01 , removing of old filter media from fiiterbed and stacking the same with in 50 mtrs lead as per instruction ofengineer incharge , chemical cleaning of filter media by thechemical which is approved by the engineer in charge size above 20 mmand separating and grading the same in three size by sieve 40 mm to 65imm , 20 mm to 40 mm and 3 mm to 6 mm . refilling the same in filter bedin three layer with in a 50 mtrs lead as per instruction of engineerincharge ( 1 ) filter media bed ( 8 . 35m x 7 . 5m ) ( a ) 40 mm to 65 mm ( 2 x 8 . 35m x7 . 5m x 0 . 15 = 18 . 78 ) , chemical cleaning of fiiter media by thechemical which is approved by the engineer in charge size above 20 mmand separating and grading the same in three size by sieve 40 mm to 65imm , 20 mm to 40 mm and 3 mm to 6 mm . refilling the same in filter bedin three layer with in a 50 mtrs lead as per instruction of engineerincharge ( b ) 20mm to 40 mm ( 2 x 8 . 35m x 7 . 5mx 0 . 1 = 12 . 53 ) , chemical cleaning of fiiter media by the , chemical which is approved by the enginchemical which is approved by the engineer in charge size above 20 mmand separating and grading the same in three size by sieve 40 mm to 65imm , 20 mm to 40 mm and 3 mm to 6 mm . refilling the same in filter bedin three layer with in a 50 mtrs lead as per instruction of engineerincharge ( 2 ) filter media bed ( 5 . 25m x 4 . 7 m ) ( a ) 40 mm to 65 mm ( 2 x5 . 25 x 4 . 7 x 0 . 15 = 7 . 40 ) , chemical cleaning of fiiter media by thechemical which is approved by the engineer in charge size above 20 mmand separating and grading the same in three size by sieve 40 mm to 65imm , 20 mm to 40 mm and 3 mm to 6 mm . refilling the same in filter bedin three layer with in a 50 mtrs lead as per instruction of engineerincharge ( b ) 20mm to 40 mm ( 2 x 5 . 25 x 4 . 7 x 0 . 1 = 4 . 94 ) , chemical cleaning of fiiter media by thechemical which is approved by the engineer in charge size above 20 mmand separating and grading the same in three size by sieve 40 mm to 65imm , 20 mm to 40 mm and 3 mm to 6 mm . refilling the same in filter bedin three layer with in a 50 mtrs lead as per instruction of engineerincharge ( c ) 3 mm to 6 mm ( 2 x 5 . 25 x4 . 7 x 0 . 1 = 4 . 94 ) , removing of old pvc umbrella nozzlefilter type and cleaning the same and fixing after cleaning as perinstruction of engineer incharge , providing and fixing of pvc umbrellanozzle candy filter type as per instruction of engineer incharge , supply and fixing of air nipple as perinstruction of engineer incharge , supply and laying of coarse sand 0 . 5 mmto 1 mm and fairly uniform fine sand 0 . 25 mm to 0 . 40 mm; grain free fromlime stone as per instruction of engineer incharge ( 1 ) filtermedia bed ( 7 . 5m x 6 . 4m ) ( a ) 0 . 5 mm to 1 mm ( 2 x 7 . 5 x 6 . 4 x 0 . 15 = 14 . 40 ) , supply and laying of coarse sand 0 . 5 mmto 1 mm and fairly uniform fine sand 0 . 25 mm to 0 . 40 mm; grain freefrom lime stone as per instruction of engineer incharge ( b ) 0 . 25 mm to40 mm ( 2 x 7 . 5 x 6 . 4 x 0 . 7 = 67 . 20 ) , supply and laying of coarse sand 0 . 5 mmto 1 mm and fairly uniform fine sand 0 . 25 mm to 0 . 40 mm; grain free fromlime stone as per instruction of engineer incharge ( 2 ) filtermedia bed ( 5 . 25m x 4 . 7m ) ( a ) 0 . 5mm to 1 mm ( 2 x 5 . 25 x 4 . 7 x 0 . 15 = 7 . 40 ) , supply and laying of coarse sand 0 . 5 mmto 1 mm and fairly uniform fine sand 0 . 25 mm to 0 . 40 mm; grain freefrom lime stone as per instruction of engineer incharge ( b ) 0 . 25 mm to40 mm ( 2 x 5 . 25 x 4 . 7 x 0 . 7 = 34 . 545 ) , supply and repairing of pvc solutionline 80 mm isi mark and cleaning the nozzle pipe and fixing the sameafter cleaning each as per instruction of engineer incharge , filter media transportation of coaresand fine sand from godhra to bhopal i . e 460 km , providing and inserting nipple withapproved fiixng compound after drilling holes for grouting as pertechnical specification including subsequent cutingremoval and sealingof the hole as ecessary of nipple after complection of grouting withcement epoxy and as per relevant clauses of section 2800 , sealing of cracks/porous concrete byinjection process through nipples/grouting complete as per technicalspecification and asper relevant clauses of section 2800 @3kg eachnipple