I try to contact CTCI Khun Preecha and Khun Pornsin for the below at you informed. And Please let me know who told you that ask CBA clear with Phelps Dodge. Because this CBA done the job under Raiwins and Riawins and CTCI Instruction CBA to do follow Phelps Dodge propose procedure and Phelps Dodge with sent supervisor to measure and control CBA quality of work during CBA polishing on site until completed and all the cost CBA will claim to Riawins and also CTCI informed please sent all the cost of polishing to CTCI and CTCI will discuss with Phelps Dodge