CONSULTANCY SERVICES FOR THIRD PARTY INSPECTION, QUALITY ASSURANCE AND TECHNICAL AUDIT ( QATA ) FOR CIVIL WORK CONSTRUCTION OF VEHICULER UNDERPASS BY BOX PUSHING METHOD WITH CONNECTING THE APPROCHES AND VUP WITH APPROACHES NEAR TRI- MANDIR AND CONSTRUCTION OF APPROACHES FOR EXISTING BRIDGE AND BOX ON BOTH SIDES OF EXISTING BRIDGE No. 45 OF RAILWAY ( KHODIYAR – GANDHINAGAR RAILWAY LINE ) ) ON AHMEDABAD- KALOL – MEHSANA SH- 41 ROAD DISTRICT GANDHINAGAR ( KM. 19/ 800 to 21/ 600 )