Hello dear,

i think that mtech in applied geology is better option then environment engineering.because applied geology from ISM dhanbad is very good for civil engineer because it has many advantages which are listed below.

• placement is very good and top companies like Schlumberger, Shell etc. are coming there every year

• experienced faculty 
  

• good facilities for research

• very good environment
  

so, you have to go for it.

Hope This Helps.