consultation for design and estimate for construction of a sub way ( under bridge ) at railway crossing no 112 at mil stn dappar under ge ( p ) dappar , ( a ) collection & review of all available reports and published information about the project rob and the project influence area ( b ) detailed reconnaissance . ( c ) identification of possible improvements in the existing alignment with evalluation of different alternatives and proposal of best suited alignment/geometric for the proposed rob and its approaches . ( d ) topographic surveys using total stations as per guidelines of latest irc sp-19 . fixing of tbm and all reference point on ground during survey and should be clearly shown on detailed survey drawings . ( e ) preparation of alignment option study report & general arrangement drawing for approval of concerned authorities . ( f ) finalisation of gad of proposed rob in confirmity with the requirements of the railways and submission to employer for obtaining approval of gad by concerned railway authorities . the selected consultant will have to pursue the matter and interact with railway authurities on technical issue during the process of approval of gad . the required p&e charges payable to the railways shall be paid by the employer . the bidders are advised to get themselves acquainted with the various requirements of the railways with regard to construction of rob for expeditious preparation and approval of the gad . ( g ) preparation of gad for construction of proposed rob & its approaches ( in accordance with approved gad by railway authorities ) . plan & profile of approach road as per guide lines of related irc , is and railway codes .