Ukukhetha isixhobo sokulayisha amavili esifanelekileyo kwimisebenzi ye-quarry kubalulekile ekuphuculeni imveliso, ukunciphisa ixesha lokungasebenzi, kunye nokulawula iindleko. Ngokusekelwe kwisikhokelo samva nje soshishino, nazi amanyathelo abalulekileyo kunye nezinto ekufuneka ziqwalaselwe.