ECC Environmental Scientist interview questions

I had a phone interview with a senior employee. It went well and he told me that i will be called on-site. After continuous emails, the on-site was scheduled 2 months after the phone interview. The interview was very casual, there were 4 employees present there and asked me few general questions. They got back to me after a month of the interview saying they chose another candidate. It was a waste of time for me.