The ground to be excavated to the required depth with all possible expedition, the work to proceed by night and day; and there shall be maintained during the progress of the work all such fencings, hoardings, struttings, and shorings, as may be necessary for or in consequence of any of the works, for the protection of the public, and of all buildings and property whatever, near to or liable to be affected by the work, which shall also be well watched and lighted.
The shoring and strutting of the excavation is to be done in such manner, with poling boards, waling pieces and struts, as the surveyor shall consider necessary.
All surplus earth or material is to be carted away as speedily as possible. Care must be taken where the excavation is made in a road or path to keep separate the surface material from the lower, so as to replace them in their proper positions.
The excavation shall in all cases where practicable be in open cutting, and not by shafts and headings.
The junction with the main sewer to be done in the following manner:—
The drain shall in no case be less than four inches internal diameter, and shall be constructed of well-burnt glazed socketed stoneware pipes, circular, perfectly true in bore, and straight, with whole socket joints free from flaws, blisters, cracks, or other defects, set in Portland cement joints with a uniform fall, well bedded on well-rammed and solid ground, the sockets being sunk into it so as to give an even bearing. No shafts or sudden falls will be allowed.
Where the junction is with a sewer constructed of pipes, one length of the sewer (or more if necessary) shall be removed and an oblique proper glazed socket junction pipe, set in Portland cement, inserted in its place.
The junction with the sewer shall be of the same size as the drain.
Where the junction is with a brick or stone sewer, the connection shall be made at such height above the invert as the surveyor shall determine, and be made with a glazed socket pipe obliquely in line of current of main sewer, properly bedded in with cement, cut off so as to take the form of the main sewer and offer no obstruction to the proper flow of sewage therein, or with a properly constructed stoneware block junction.
On completion of the junction, which shall be made before any of the pipe drain is laid, it shall be inspected by the surveyor, and the work must not be further proceeded with until such inspection has been made and the junction pronounced satisfactory. The drain shall be properly trapped between the sewer and the house, with a syphon of such form as the surveyor shall direct, and be at its inlet end or other extremity carried up open its full diameter to above the roof line.