supply of material , purchasing material , providing and fixing reinforced cement concrete cover of size 60 cm * 45 cm cm without frame over inspection chamber , providing and laying concrete pipes of i.s.np. class of 300mm diameter in proper line, level and slope including necessary collars, excavation, laying, fixing with collars in cement morter 1:1 and refilling the trench. , providing and constructing brick masonry inspection chamber 60cm * 45cm* 90 cm including 1:4:8 cement concrete foundation 1:2:4 cement concrete channels half round g.s.w. pipes, brick masonry, plastering from inside and with frame fixed in cement concrete with rcc cover medium duty 140 kg frame etc.