Excavating

The contractor shall dig all trenches, pits or cisterns required for the execution of his work, and, when the installation has been passed by the sanitary inspector, all trenches and other openings shall be refilled and left in as good condition as before they were opened. The contractor shall be responsible for all damage or injury arising from accidents caused by negligence or carelessness in not properly safeguarding his work.

Material For Drainage System

The contractor shall provide all pipe, fittings, supports, packings and lead for the drainage system, and shall install it according to the layout shown on the drawings. The pipes shall all be of cast iron of the hub-and-spigot pattern, sound, cylindrical and smooth, free from sand holes, cracks or other defects, and covered on the inside and outside with a coating of asphaltum. All pipes buried in the ground shall be of the grade known to commerce as extra heavy, and all vertical stacks of soil, waste and vent pipe shall be of the grade known to commerce as standard.

Standard and extra-heavy cast-iron pipe shall not be less than the following weights per lineal foot:

Inside diameter of pipe

Average weight per lineal foot, including hubs

Standard

Extra heavy

2

inches

3 1/2

5 1/2

pounds

3

,,

4 1/2

9 1/2

,,

4

,,

6 1/2

13

,,

5

,,

8 1/2

17

,,

6

,,

10 1/2

20

,,

All fittings shall be coated on the inside and outside with asphaltum, and shall correspond in weight to the pipes with which they are connected. The entire horizontal portion of the house drain shown on the ground-floor plan shall be buried in the earth below the floor.

Fall Of Drains

All pipes in the house-drainage system shall be laid at grade to produce throughout a uniform velocity. Pipes of the several diameters shall be laid at grades not less than those specified in the following table:

Diameter of pipe

2

inches

3

,,

4

,,

5

,,

6

,,

Fall per foot

3/5

inch

2/5

,,

3/10

,,

1/4

,,

1/5

,,