Gujarat Water Supply And Sewerage Board (GWSSB) published Exam date & Call letter notification for Hydrologists & Environment Impact Analyst Examination, 2016. This exam will be held on June, 2016 at Gujarat University, Vadodara. You can download your call letter at 17/06/2016 at 05:00 pm from OJAS’ official website by following link. You need to enter your application no. & birth date to view call letter.