Geotechnical Investigation at Zirconium Complex, Pazhayakayal, Tuticorin.

Mobilisation and demobilisation of suitable boring and drilling plant and all other allied equipment like boring rigs, all other in-situ tests equipments, and all equipment necessary to do the work under scope of this contract etc. including all skilled and non-skilled personnel required for the work etc. complete and demobilisation of same on completion of entire work and removal from site (CONTRACTOR to mobilise sufficient equipment to the site in order to complete the work within the stipulated time-frame.) Drilling rigs must be capable of vertical drilling through all kinds of soils and all types of soft to hard basaltic / Granite rock all as per specification & drawing and as directed by the Engineer-in-charge. Notes: 1) A minimum of 3 rigs are to be deployed for execution of the work. 2) 30% of the amount will released after mobilisation of a minimum of 3 rigs. 3) 30% of the amount will released after setting up of site laboratory. 4) 40% the amount will released after demobilisation of rigs, lab equipment and clerance of site.

Setting up of boring rig at each borehole location including moves between borehole positions, locating and marking the location on the ground by actual survey, setting up all field test equipment and bringing all personnel to the location, making area good for setting up rig etc. complete. Any criss-cross or back and forth movement of the rig can take place, all as per specification & drawing and as directed by the Engineer-in-charge.

Boring vertically through all kinds of soils, weathered rock and soft rock/boulders if any, met during drilling with suitable and adequate equipment of diameter 116 / 150 mm or more for all depths measured below existing ground level at rig location, casing shall be provided wherever required & as directed by Engineer-In-Charge.

Drilling vertically through bedrock strata (Hard rock), using NX/ NQ size diamond bit, using double tube core barrel with suitable core catcher, including collection and logging of cores, placing them in approved core boxes made of Galvanised iron (GI) 22 guage of standard size, numbering and indexing each core, noting the lithology, colour photographs (100X150mm size) of rock cores, locking arrangements, labeling and transporting the boxes to core store/laboratory located with in BARC (V) campus and as per the direction of EIC for the following depths measured from existing ground level all as per with requirements as per IS:4078 and as directed by Engineer In Charge.

0m to 20m. From G.L

20m to 40m. From G.L

Obtaining 90mm diameter, 450mm long undisturbed soil samples (UDS) from boreholes at every change in stratum or for every 1.5m stratum depth, whichever is less, as per IS:2132, WITH JARRING LINK and wax sealing and labelling the container & to be tested in site laboratory used for determining various parameters all as per specifications and as directed by Engineer-In-charge. Note: First UDS sample shall be collected at 0.5m/1.0m depth in general.

*NOTE for Item No 1.07, 1.08, 1.09: Standard penetration test shall be conducted at 1.5m interval. Sequence of conducting SPT shall be changed in each bore hole. Say for first bore hole SPT started at 1.5 m depth then 3.0 m, 4.5m……….. etc. For next bore hole within a building/ facility, it shall be started at 1m depth then 2.5m, 4.0m …… etc. Similarly for other bore holes. So that staggered value of SPT’s obtained for entire site.