Zone No. 4:- Zonal work for all Civil repairing works etc falling in UP Yard Colony, Gaya Colony, Manas Nagar Colony, of Staff Quarters and service buildings viz TRS Training School and Hostel Manas Sansthan, RPF Up post, RPF Barrack, Sub Station, RCC OH Tank, Steel OH Tank, ATP School, Pump House, Telephone Exchange, Health Unit and Sub Station etc. under ADEN/ HQ/ DDU.