Bedding in Rock Clause Samples

Bedding in Rock. When soil strata in the trench is rocky, or consists of any unsuitable material which is likely in the opinion of the Employer’s Representative to cause damage to the pipe, then bedding from the selected excavated material consisting of soft soil, soil mixed with sand shall be provided. If excavated material is not suitable for bedding in the opinion of the Employer’s Representative, sand or gravel bedding shall be provided. The sand or gravel used for bedding shall be clean, well graded and free from topsoil, clay or vegetable matter and to the approval of the Employer’s Representative. If the sand supplied is unclean it shall be washed. In no case shall sand containing more than 3.5% by dry volume or 5% by wet volume of clay, loam or silt be accepted. Tests specified for determining silt in sand and organic impurities as described in IS 383 shall apply. The depth of over-excavation shall be such that after excavating a minimum fill layer of 150 mm of sand or gravel bedding material shall remain below the bottom center of the pipe.