quotation for consultancy services for addl/ alteration of stp alongwith augmentation of sewage line at dinjan , 1 . preparation of topographical survey :- consultancy services for carrying out topographical survey work upto 8 km using total station with gps system the unit/ area for survey are as under:- ( i ) 302 field hospital ( ii ) 2 mdsr ( iii ) army public school ( iv ) 502 asc bn ( v ) 602 eme bn ( vi ) 671 army avn ( vii ) 2 mtn dou ( viii ) transit camp ( ix ) arty bde ( x ) 831 lt regiment . the scope of work will also include the following ( qty-01 job ) :- ( a ) topographical survey with the help of total station showing existing roads , units boundary , bldgs , major trees , existing poles , sxisting manholes with invert level , septic tank ( if any ) , ground level , culvert , establishing tbm at suitable locations on existing permanent structure as required for planning and desinging the sewer line of unit/ area included as above . ( b ) the survey shall also include top and invert levels of pipe and total discharge available upto collection chamber of stp . ( c ) preparing level sheet at a grid of 3m x 3m interval . top/ invert level of each manholes and natural ground level along the existing sewage including making distance between each manhole . ( d ) preparation of boq and cost estimates for the items at ser no 1 ( a ) to ( c ) and submission in quadruplicate alongwith names reputed makes . ( e ) the scheme drg , hydraulic shall be vetted , from phe experts of iits/nits for techincal feasibility . the designed scheme should be properly dovetailed with existing , sewage systems and the scheme designed by consultants and detail presentation shall be made by consultants to station authority and ce shillong zone .