Construct effective volume 1.75 m3 dilution & neutralization pit out of reinforced concrete shear wall on a base of 200mm thick R.C concrete bottom slab, RC top & bottom slab and reinforced concrete manhole cover. The work shall be carried out in accordance with the given sanitary and structural drawings & instructions. Price shall include excavation to the required depth, backfilling, cart away, wate proofing and all the necessary assistance and incidental works.