bids are invited for custom bid for services - consultancy for soil investigation for provn of deficient smqs at 12 brd. the scope of work is as under:- n (i) mobilization & demobilization of all requied equiptment and adequate number of the boring machines and entire accessories etc to the site of work (including labour accommodation). (ii) determining sbc of soil for provn of defi md accn, (g+1) at 12 brd (najafgarh) under ge (af) tughlakabad by performing standard penetration test as per is 2131 by boring/drilling 100 mm dia bore hole upto 10 metre depth from ngl or refusal along with spt at every change in stratum or at depth 1.00 m, 1.50 m, 2.00 m from ngl all as per is 2131-1981 (reaffirmed 1991). arrangement for drilling/boring must be catered for by agency and open pits will not be allowed. carrying out spt with special attention to following clasues of the is:- (a) eqpt used shall provide a clean bore hole, 100 mm in dia to ensure that the penetration test is performed on undisturbed soil and shall permit driving of split spoon sampler to obtain penetration record alongwith samples as specified is is code procedure. (b) while driving casing, it shall not be driven below the level at whitch the test is to be carried out or from where the sample is to be taken. (c) in case wash boring is adapted for cleaning of the borehole, only side discharge bit are permitted, a bottom discarge bit is not permitted while boring through soil which may get disturbed by flow of water while boring above water table level. (d) collection of undisturbed sample at every 1.00 m depth interval as well as at any change of strata, including waxing, sealing, packing, transporting to the lab. (e) conducting necessary tests mentioned below which includes the soil bearing capacity (sbc):