Pipes. For conduits the stone ware pipes of 150mm and 250mm internal diameter required for the work shall be according to XXXX No.107 and S.W. pipes shall be laid to proper alignment and level and joining the same by inserting splln yarn. in the socket and pointing with cement as per XXXX N.o.110. The S.W. pipes shall be laid in trenches excavated and refilled with sea sand. These pipes shall be inserted through brick retaining walls at the edges and middle of the trenches consisting of stock brick work in cement mortar 1:6 over a bed of brick jelly concrete in lime mortar 1 :2:5 for which items payment will be made on unit basis for the measured quantities.
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