Central Ground Water Board Tender

Drilling by DTH method using appropriate sizes of button bits so as to reach targetted depth with diameter of hole not less than 165 mm at 100 m depth and final diameter not less than 152 mm at hole bottom including measurement of discharge through V-notch at various stages (depth) of drilling, collection of water sample for each aquifer formation/ fracture zone encountered adopting standard procedure, formation sample collection at every 3 meter intervals, preparation and submission of litholog, discharge measurement etc with video recordings discharge and V notch readings, lithlog samples.

Electrical logging using 406 mm and 1626 mm (16" and 64") SP resistivity probe and preparation of composite log along with video recordings

Natural gamma logging submission of logging graph, report along with video recordings

Caliper logging, submission of logging graph, report along with video recordings

Pumping Test incudes prepumping for 8 hours and recuperation for 24 hours, SDT (4 steps), APT for 1000 minutes and 90% or full recovery) and collection of 4 Nos water sample adopting standard procedure for basic parameter and heavy metals in 1 litre good quality HDPE bottle along with video recordings.

Preliminary yield test including collection of 2 Nos. Water samples adopting standard procedure for basic parameter and heavy metals in l litre good qua1ity HDFE bottle and submission of analysis report with data with video recordings.

Slug test and submission of analyis report with data with video recordings.

Reaming with rock roller/ drag/ button bit as appropriate to accommodate part assembly as given below.

Supply and installation of ERW casing pipe (for part assembly conforming to latest version of IS: 4270-2001. The part assembly pipe should be lowered by using reverse socket through drill string. Video of lowering part assembly should also to be submitted

Supply and installation of MS slotted pipes conforming to sizes as per Table 1 with slotting arrangement shown in Figure 2 of latest version of IS: 8110-2000.

chemical analysis of water samples for 15 parameters pH, EC, TH, TDS, Ca, Mg, Na, K, CO3, HCO3, S04, NO3, Cl, F & Fe in NABL accredited labs and submission of report from NABL lab

chemical analysis of water samples for heavy metals Iron, Chromium, Lead, Uranium 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 housing pipe welded with minimuin 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 EW” for Exploratory Wells & "CGWB OW" for Observation wells should carved with welding on outer surface of casing pipe, 0.5mtrs.

Supply and installation of protection box made of GI sheet of 3.l5 mm thickness along with Brass lock, (7 lever hardened) and three keys for each lock as per drawing

Supply and installation of Display board as per specification in drâwing

Preparation and submission of basic data report per site (includes EW and OW) in tripIicate along with logging graphs, data sheets, analysis sheet,Iogging graphs,chemical analysis report from NABL lab, photographs and videos of activities drilling assembly lowering, part assembly lowering, pump lowering, pumping tests, discharge during pumping test, V- notch discharge at various depth of drilling, pumping test with well discharge, compressor development, water sample collection, well site with display board well cap, protection box tec..The soft copy should be submitted. Summary of wells details in xls format including detail of dia and depth housing pipe, part assembly pipe if any, screen pipe if any, static water level, TDS, aquifer parameters, safe discharge, gravel packing, depth and thickness, litholog, depth of fracture zone and respective V-notch discharge etc if any should be also submitted.