TOPOGRAPHIC SURVEY WORKS AT TIFR MUMBAI

Establishing permanent Bench mark w.r.t. GTS datum using DGPS (Ground Control Points) by post processed kinematic, using WGS 84 datum for X - Y coordinates and Ellipsoidal datum for third axis , Latitude, Longitudes and Altitude using high pricision DGPS instrument of reputed make (Leica, FOIF or equivalent ), staking out, establishing the existing coordinates including extra coordinates using static method and constructing Concrete Pillar of size 300 mm x 300 mm by 1200 mm (of which minimum 600 mm is anchored below ground level, refer Figure-01) – To be painted in RED oil paint with the GTS level written in Black using stencil. Note : 1. Observations of base station should be moret than 48 hours and rove for minimum 2 hours.Permissible error is 5 to 10mm only. 2. Rate shall be inclusive of Transfer of existing GTS bench mark of the region at various locations of TIFR, Colaba & adjcent area. Bench mark shall be identified by EIC. The item is inclusive of making permanent RCC pedestals, excavation, smooth plaster,embedding plates marking in paints /punch etc. complete as directed by EIC or as per approved sketch.

Topographical & Contour survey work to prepare master plan of residential colony using Electronic Total Station (ETS) of reputed make LEICA FOIF SOKKIA or equivalent approved with on site detailing by taking spot levels creating bench mark and TBM by fly levelling.Topographical survey includes locating existing salient features within TIFR Campus & adjacent area such as trees(Girth 100mm & above), culverts, manmade structures, hills, valleys,water streams, sea shore, roads, pipeline & cable markers, drains, manholes , inspection chambers, service lines, fence, compound wall, communication and supply lines etc. complete. Maintaining field books and to be submitted at the end of the survey work to department. Preparation of Preliminary drawings in five sets excluding check prints with soft copy of drawings compatible with auto CAD on CD.Drawings are to be produced in the following method. Contour interval shall be 0.2m. Spot levels shall be taken on grid of 5m x 5m and at closer intervals (1.5m or less)wherever required i.e. at locations change of gradients, invert levels of valleys, natural water ways, and all type of manholes / chambers shall also be marked.Scope shall also include obtaining level along the height of existing buildings (temporary & permanent) and drawing elevational section at specified locations as per drawings.The survey results will be drawn in layers including 3 D mapping. Scope also comprises of VALIDATION of contour survey and reverse traversing to origin point and close the traverse. The permissible error in survey is 2" and linear 5 mm only. i) Drawing with major grids & showing topographical details plotted. All reference pointing topographical details and existing buildings and road etc. shall be located on drawings so as to develop /relocate /transfer any point. Note : Rate shall be inclusive of following 1. Opening manhole / chambers covers and refixing the same, removing unwanted soil over covers, removing small branches of trees, bushes etc., or any other associated work required to collect above and as directed by E.I.C. 2. Marking invert levels and dia of incoming /outgoing sewer pipes in manhole / chambers in drawings. 3. Marking invert / top levels of water supply lines incoming / outgoing through chambers in drawings. 4. Marking plan dimension & height of structures / buildings in drawings. 5. Marking width and invert levels of storm water drains at regular intervals and at locations of intersections / change in cross section in drawings 6. Marking height , thickness and type of compound/ retaining wall in drawings. 7. Marking pylons, electrical / telephone poles,feeder pillars, telephone boxes, cable / pipe line markers in drawing. 8. Marking fire hydrants in drawings 9. Marking any other miscellanious items in drawing as directed by E.I.C. 10. Taking print outs of topogrphical / contour survey in parts at 1 : 100 scale for checking / validation of surveyed area regularly / daily as directed by E.I.C. 11. Taking data of trees such as girth dia 100mm and above, height 1200mm & above and species of trees and marking in drawing and submitting report in approved format. 12. Removing unused material from site and make site clean before completion of job as directed by E.I.C.

Softa Geotechnical Pvt. Ltd.

LandandCoast