| http://www.w3.org/ns/prov#value | - The pipes shall be laid separately to true inverts, straight lines and falls, each pipes being separately boned between sight rails and bearing evenly upon the solid ground or concrete for its full length. (b) Where pipes are laid without a concrete bed, holes shall be cut in the bottom of the trench of such size and depth as to allow the joints to be properly made and the barrel of the pipe to be
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