These instructions are given in writing by the authorised person supervising the construction. These instructions generally bring to the notice of the Contractor aspects of non-compliance of work with the drawings or specifications. The Contractor has to make good such lacunae so that the work may proceed in conformity with the drawings and specifications. The site instructions also include a variety of situations not clearly defined in the drawings such as :
- actual excavation and founding levels as approved by the Engineer,
- deviations from the drawings as approved by the Engineer,
- instructions for rectification or demolition of substandard work, and
- unusual observations such as collapses during excavation, problems of dewatering, etc.
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