FOR CONSTRUCTION OF PIEZOMETERS 61 NOS IN HARD ROCK / BOULDARY IN THE UT OF LADDAKHFOR CONSTRUCTION OF PIEZOMETERS 61 NOS IN HARD ROCK / BOULDARY IN THE UT OF LADDAKH

Amount

Drilling of pilot hole using ODEX for PZ not larger than 216 mm (8 ½”) by button bit including formation sample collection at an interval of 1m or change in formation whichever is earlier, preparation and submission of litholog including installation of ERW casing pipe 65 m of (4" diameter)/well and slotted pipe 5 m of (4" diameter)/well including pulling out of 216mm (8 ½ “) casing pipe.

Drilling by DTH method using appropriate sizes of button bits so as to reach targeted depth with diameter of hole not less than 165 mm at 100 m depth and final diameter not less than 152 mm at bottom of holes/150 m depth including sample collection and prepartion of litholog

Caliper logging to decipher the depth and width of fracture zones, submission of report including logging graph, interpretation of graph, generation of composite log along with video recording

Supply and installation of ERW casing pipe conforming to latest version of IS: 4270-2001 of diameter and thickness given below

100 mm (4”) Nominal Bore, thickness 5.4mm

" Supply and intallation of Stainless Steel 4"(100 mm) dia. x 0.75 mm slot size regular Grade ERW Stainless Steel Cage Type V-wire wound screen as per IS :8110-95 and material specifications as per AISI type 304, Grade SS -304 suitable for water well construction

Slot opening 1.0 mm (Stainless Steel SS304 Grade)

Supply and shrouding of pea gravel confirming to latest version of IS: 4097-1967

Particle size range 2.00 mm to 3.35 mm for 1.0 mm and 0.75 mm slot opening

Supply and filling up borehole/ annular space between casing pipe and bore hole wall with local clay, if required

Development by Air Compressor of adequate capacity for minimum 5 hours, over pumping and by other means till discharge water is clear and free of sand including collection of two water samples from PZ well adopting standard procedure in 1 litre HDPE bottle, along with video recordings of compressor hour meter, discharge etc.

Chemical analysis of water samples for 15 parameters pH, EC, TH, TDS, Ca, Mg, Na, K, CO3, HCO3, SO4, NO3, Cl, F & Fe in NABL accredited labs

Chemical analysis of water samples for Heavy metals (As, U) in NABL accredited labs and submission of report from NABL lab

Construction of cement concrete platform of dimension 0.70 X 0.70 X 0.60 m (0.30 m above ground level) using concrete mix of 1:2:4 around the around the Piezometer well welded with minimum 6 Nos of anchoring plate as per drawing

Supply and fitting of well cap as per drawing with Allen Keys. MS Plate size 5 mm embossed & welded with permanent marking of “ CGWB PZ” should be carved with welding on outer surface of casing pipe

Supply and installation of protection box made of 3 mm GI sheet of Size: 550mm X450mm X530mm along with Brass lock (7 lever hardened) and three keys for each lock as per drawing

Supply and installation of Display board as per drawing

Preparation and submission of basic data report per site in triplicate along with data sheets, analysis sheet, chemical analysis report from NABL lab, site location map and approachability with landmarks, photographs and videos of activities of drilling, assembly lowering, gravel measurement and gravel packing, well development using compressor and well water discharge, water sample collection, well discharge with discharge measurement, well site with display board, well cap, protection box for each site, etc.The soft copy as well as hard copy should be submitted. Summary of Piezometer details in xls format (as per proforma given by CGWB) including details of dia and depth of assembly pipe, screen pipe, static water level, gravel packing depth and thickness, Litholog etc. should be also submitted.

BSR CORPORATION Pvt Ltd (BID ID -3189727)

shivdrillers (BID ID -3184298)

M/s. SRI SAI BORE WELLS (BID ID -3189001)