Thank you for the Weekly report you have sent me.
I have seen a lot of materials on site especially reinforcement steel bar, Is it possible to ask Potonggang to cut a length of one meter for each size of reinforcement steel bar (3 samples each ) to be tested, Please also ask Mr.Jo to get it tested, at Potonggang's expense, otherwise do not let them use it in construction work until it past the test.
The same goes as Concrete.
Please have the result forward to me as soon as you get it.