The correct answer is: A. Instructions by the executive engineers.
A site order book is a document used to record instructions given by the executive engineers on a construction site. It is a vital tool for ensuring that all instructions are communicated effectively and that there is a clear record of what has been agreed. The site order book should be kept up-to-date and should be signed by both the executive engineer and the site manager to confirm that the instructions have been received and understood.
The other options are incorrect because:
- B. Construction measurements are typically recorded in a construction drawing or a field book.
- C. Issue of store equipments is typically recorded in a store ledger or a stocktake report.
- D. Names of the casual labour are typically recorded in a payroll or a timesheet.