Cross Sectional Survey and Geotechnical Investigation Phulbari

Amount

Conduct of Cross Sectional Survey Fixing and Construction of Permanent Bench Mark cum Control point (With all X, Y and Z valuse), either by transfer using a DGPS from Survey of India (Sol) GTS Bench Mark along with latitude and Longitude value from nearby location to project area or in case such Sol GTS Bench Mark is not available in a reasonable distance, by using a DGPS for sufficiently long time to attain accuracy in mm.

Cross-Section Survey of River Brahmaputra at Conflunce point of Jingiram River both Upstream & Downstream along the River Brahmaputra Bank perpendicular to the general flow direction of the river at that point at 100.00 m intervalsa c/c for a length of 100.00m in the river portion and 100.00 m in the country side from the river bank with a total length of 200.00 m or as directed by field engineer in deep water reachs using boat as directed. Assuming River in a reach of 5.500 KM (appx) from Patakata village to Baitbari village at Phulbari, West Garo Hills District, Meghalaya.

River X - section plotted in CAD and soft copies submitted along with 3 coloured hard copies of each in a scale of 1:500 plotted on A 3 paper for Sl No 2

River L - section plotted in CAD and soft copies submitted along with 3 coloured hard copies of each in a scale of 1:1000 plotted on A 3 paper for over Sl No 2

Plan showing entire area plotted in CAD showing a) river bank profile, b) location of X - Sections under Sl No 2, c) all BM cum control points and d) reference points. The soft copiy along with at least 3 coloured hard copies of the drawing will be submitted in a scale of 1:1000 in requisite number of A 3 size pages along with an Index in A 3 pages. All surveyed points will also be submitted in Universal Transverse Mercator (UTM) co-ordinates system in soft copy along with KMZ file of the same.

Preparation of DPR including Printing etc.

Geotechnical Investigation, Mobilisation and Site Clearence Mobilisation of boring plant & rigs, static cone penetration test and all other allied equipment like boring rig and equipment for conducting all in-situ tests etc. including qualified personnel and demobilisation of the same on completion and removal from site. First setting up of rigs is included in the item and shall not be paid in any of the other item. CONTRACTOR to mobilise sufficient equipment to the site in order to complete the work within the stipulated time-frame

Clearance of vegetation, jungle clearance removal of debris etc and making proper approach access to marshy /swampy areas/river as may be required to designated borehole locations for erecting rig /SCPT as and equipment complete as required to complete the work complete in all respects & remove the same from site. all respects & remove the same from site. (All items require written approval from Engineer in charge) On land (including area covered on soft and swampy soil )

In-Situ Test Setting up of boring rig at each location, shall be paid only once for each borehole location including moves between borehole positions. Item includes marking the location on the ground by actual survey (by using precision position instruments such as Global Positioning System and Total Station) from nearby bench mark based on the co-ordinates provided in layout drawings, setting up all field test equipment and bringing all personnel to the location. Making area good for setting up of the rig etc. Complete all as per the specification and as directed by Engineer. Any criss-cross or back and forth movement of the rig can take place. Note - Setting up at first location (land /river as may be applicable) is considered to be included under mobilization and shall not be paid under this item). On land (including area covered on soft and swampy soil)

Wash boring for single bore hole of 50mm dia.Up to Required depth up to 15m or refusal below existing ground level as necessary and site condition as per IS standard. Standard penetration (SPT for N value) test to be taken at every 1.5m depth. First test shall be conducted at1.5m depth below the G.L. and two nos. of U.D.S shall be taken. Collection of soil samples at every1.5 m depth for visual inspection and classification of the soil. Recording the depth of the ground water table if made in the bore hole depth. Submission of soil investigation report with soil bearing capacity including the bore log along with all field observation and soil classifications, result of the grain size analysis, Atterberg's Limits, consolidati on and shearing parameters etc. including find out of bore hole location and the preparation of the report. Item includes cost of all the handling charges and dispatching soil samples (samples to cover over all representation of substrata which are not obtained by UDS and SPT) to Laboratory for carrying out testing in lab etc. all as per the specification and as directed by engineer in charge, excl.lab testing, reporting etc as specified in subsequent items all complete as directed. On land (including area covered on soft and swampy soil) ORDINARY SOIL/HARD SOIL boring will be terminated on Refusal for 3 times continuosly. 0-10m

Obtaining 90 mm diameter 450 mm long undisturbed soil samples (Both under water & Land boreholes ) using shelby tube at every 3m interval up to 10 m depth and 2 m interval beyond 10 m or at change of strata ATERNATE TO S P TEST from boreholes and sealing and labelling the container. Continuous UD Sample shall be taken at 1.0 M interval if subsoil is soft and cohesive etc. all as per the specification and as directed by Engineer. Undisturbed soil sample shall be collected only in soft to stiff clay having SPT value up to 20 and medium stiff to hard clay SPT shall be conducted. Note: Undisturbed Soil Sample (UDS) shall be completely coated with paraffin wax and shall be kept under shade at no time to be exposed to direct sunlight. UDS shall be transported to Laboratory within seven days after completion of bore hole/trial pits.

Conducting Standard Penetration tests in soil (Both under water & Land condition), soft and weathered rock at 3m intervals or at every change of strata alternate to undisturbed sampling and collecting the disturbed samples in sand/silt . Packaging and labelling the disturbed soil samples for transporting in laboratory for obtaining field moisture content all as per the specification and as directed by Engineer

LABORATORY TESTS Grain size analysis: Hydrometer analysis

Grain size analysis: Sieve analysis

Liquid limit, plastic limit and plasticity index.

Shrinkage limit and shrinkage ratio.

Field density and moisture content.

Specific gravity of soil.

Free swell index measurement as per IS 2720 Part 40

Swelling pressure test as per IS 2720 Part 41

Unconfined compressive strength

Direct shear test/Triaxial compresssive test/ shear paramaters

REPORT Preparation and submission of Two (2) copies of Draft Reports as specified and Three (3) copies of the Final Report of Geotechnical Investigations with Recommendations The approved report shall also be submitted on one computer compatible compact discs (CDs) . Report shall include photograph (by digital Camera) of rock cores, rock exposures and other Geological feature, pits. No additional compensation is payable by the OWNER for any expenses incurred by the CONTRACTOR for travel, etc. or for meetings/ discussions with OWNER/ ENGINEER.