WARNING LINE STATUTORY RESTRICTION LINE CHECK SURVEY
Working in the proximity of bodies of water on surface or underground and unconsolidated surface deposits. (Cir Tech 01/1976)
Warning line - When the working has approached within 120 m from a water body / unconsolidated deposits, plan shall be marked with green verged yellow line as warning
Statutory restriction line - when the working has approached within 60 m from a water body / consolidated deposits, plan shall be marked with green verged green as statutory line. Any advance beyond this line can only be made with the permission of Chief Inspector.
Check survey - Check survey shall be done when working has approached 120 m from water body and shall be check by a surveyor other than the one normally making surveys
at the colliery.