conversion of border security fence from phase -ii to new design fence in between bp no 846/7-s to 860/7-s 6.080 kms, bp no 860/7-s to 876/2-s 12.20 kms, bp no. 876/2-s to 900/mp 30.20 km, bp no. 900/mp to 925/mp 1.00km bp no. 987/1-s to 981/10-s 5.538km and bp n.o 984/mp to 984/16-s 2.486 km (total 57.504 kms) in district of west bengal sh:- conduct a topographical survey of land total length of fence - 43.40 kms along indo-bengladesh border (i.e bp no 860/7-s to 876/2-s - 12.20 kms, bp no. 876/2-s to 900/mp-30.20 km, bp no. 900/mp to 925/mp- 1.00 km) by using total station, dgps or any advance precise survey instruments as suitable for the work in mathabhanga sub-division in coochbehar district of wes bengal.