REPAIR AND MAINTENANCE OF DRAINAGE SYSTEM Earthwork excavation by mechanical means in foundation trenches drains in all kinds of soil to required line level width and depth , Providing and filling clean sand under foundation bed spread uniformly in layers watered and well consolidated to required line and level complete , Providing and laying cement concrete nominal mix Type D2 1 4 8 using 40 mm graded aggregate in surface channel drain , Providing and laying reinforced cement concrete nominal mix 1 2 4 Type B1 using 20 mm graded aggregate in drain base foundation slab , Providing and laying reinforced cement concrete nominal mix 1 2 4 Type B1 using 20 mm graded aggregate in drain side walls 150 mm thick , Providing and laying reinforced cement concrete nominal mix 1 2 4 Type B1 using 20 mmseparately , Providing TMT high yield deformed steel reinforcement cut to required lengths bent hooked cranked where required , Providing and removing formwork to both faces of RCC drain side walls including necessary supports bracing strutting and removal complete , Providing and removing formwork to soffit of RCC cover slab supported on drain walls including props supports bracing and removal complete , Providing and laying Bricks sub class B laid flat in floors old size bricks Total Quantity : 23400