Salary Range of Pinoys in PNG

Hi! may I ask the help of those who know the salary range of the below positions for a construction company.
I am currently working in an agency and our client is asking for a range of salaries for OFW's in PNG. I wanted to have a legit information from Filipino's who really has a clear idea of the the salary range.

Any help would be highly appreciated. Thanks!

1.       Supervisor (For unskilled workers)
2.       Safety Officer (Certified)
3.       QC Inspector-Civil
4.       QC Inspector-Electrical
5.       QC Inspector-Mechanical
6.       Rigger (Certified)
7.       Scaffolder (Certified)
8.       Welder (Certified)
9.       Tower Crane Operator (with license)
10.   JCB Operator (with license)
11.   Forklift Operator (with license)Document Control Officer
12.   Dispatcher
13.    Time Keeper