DRILLING, CONSTRUCTION, PUMPING TEST OF EXPLORATORY WELLS/ OBSERVATION WELLS IN BIHAR- JHARKHAND STATES OF INDIA

Amount

Drilling, Installation of Casing Pipe, Geophysical Logging, Pumping Tests, Slug tests & PYT in Exploratory Wells

Drilling of overburden by rock roller/ drag/ button bit to accommodate casing pipe including sample collection, preparation and submission of litholog

Supply and installation of ERW casing pipe 175 mm (7") Nominal Bore conforming to Table 3 of latest version of IS: 4270-2001 as given below

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 samples of each Aquifer formation/ fracture zone encountered, adopting standard procedure, formation sample collection at every 3 m intervals, preparation and submisison of litholog, discharge measurements etc., sample collection and preperation of litholog

Electrical Logging using 406 mm and 1626 mm (16" and 64") SP resistivity probe and preperation of coposite log

Caliper Logging, submission of logging graph, report

Pumping Test incuding 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

Preliminary yield test collection of 2 nos. water samples adopting standard procedure for basic parameter and heavy metals in 1 litre good quality HDPE bottle and submission of analysis report with data

Slug test and subission of report with data

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 and submission from NABL lab

Chemical analysis of water samples for Heavy metals Arsenic, Cadmium, Mercury, Lead, in NABL accredited labs and submission from NABL lab

Construction of cement concrete platform 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 mnimu 6 nos. anchoring plate as per drawing

Supply and fitting of well cap as per drawing. A MS Plate 5mm thick should be welded on outer surface of casing pipe (0.5 mtrs. above ground level) with permanent marking by welding method as "CGWB EW" FOR Exploratory Wells & "CGWB OW" for Observation Wells.

Supply and installation of protection box made of GI sheet of 3.15mm 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 drawing

Preparation and submission of basic data report includes EW and OW along data sheets, analysis sheet, logging graphs, etc. for each site. The BDR also should include photograph/ videos of activities i.e. drilling, assembly lowering, discharge, wate sample collection, v notch discharge at various depth of drilling, pump lowering, pumping test, protection box with display board, etc. The soft copy should also be submitted.

Drilling and Construction of Observation Wells

Drilling of overburden by rock roller/ drag/ button bit to accommodate casing pipe including sample collection, preparation and submission of litholog

Supply and installation of ERW casing pipe 175 mm (7") Nominal Bore conforming to Table 3 of latest version of IS: 4270-2001 as given below

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 samples of each Aquifer formation/ fracture zone encountered, adopting standard procedure, formation sample collection at every 3 m intervals, preparation and submisison of litholog, discharge measurements etc., sample collection and preperation of litholog

Caliper Logging, submission of logging graph, report

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 and submission from NABL lab

Chemical analysis of water samples for Heavy metals Arsenic, Cadmium, Mercury, Lead, in NABL accredited labs and submission from NABL lab

Construction of cement concrete platform 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 mnimu 6 nos. anchoring plate as per drawing

Supply and fitting of well cap as per drawing. A MS Plate 5mm thick should be welded on outer surface of casing pipe (0.5 mtrs. above ground level) with permanent marking by welding method as "CGWB EW" FOR Exploratory Wells & "CGWB OW" for Observation Wells.

Supply and installation of protection box made of GI sheet of 3.15mm thickness along with Brass lock (7 lever hardened) and three keys for each lock as per drawing

Description of Work / Item(s)

Amount

Drilling, Reaming, Assembly Lowering & Geophysical Logging

Drilling of pilot hole for Exploratory Well not larger than 216 mm (81/2") by rock roller/ drag bit including sample collection at every 3 m and change in formation, preparation and submission of litholog.

Electrical logging using 406 mm and 1626 mm (16" and 64") SP resistivity probe and Natural gamma logging, and preperation of composite log, submission of report including zone wise water quality alongwith logging graphs, raw data analysis

Enlargement of hole by Using 508 mm (20”) RR Bit for 250 mm (10”) assembly pipe reaming in Exploratory well (EW) to accommodate well assembly of recommended size and gravel envelop of minimum 100 mm thickness

Enlargement of hole by Using 381 mm ( 15”) RR Bit for 150 mm (6”) assembly pipe reaming in Exploratory well (EW) to accommodate well assembly of recommended size and gravel envelop of minimum 100 mm thickness

Supply and installation of 250 mm (10”) Nominal Bore, thickness 7.1mm ERW casing pipe conforming to Table 3 of latest version of IS: 4270-2001

Supply and installation of 150 mm (6”) Nominal Bore, thickness 5.4mm conforming to Table 3 of latest version of IS: 4270-2001

Supply and installation of 150 mm (6”) LCG V-wire, thickness 8mm, Slot opening 1mm LCG V- wire screen conforming to latest version of IS: 8110-2000"

Supply and shrouding of Particle size range 2.00 mm to 3.35 mm for 1.0 mm and 0.75 mm slot opening pea gravel confirming to latest version of IS: 4097-1967 from the bottom of recommended depth

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 10 hours, over pumping and by other means till discharge water is free of sand including collection of two water samples from EW adopting standard procedure for 1 litre HDPE bottle.

Pumping test (includes pre pumping for 8 hours and recuperation for 24 hrs. , SDT, APT and collection of 04 nos. of water samples using standard procedure for basic parametres per EW in 1 litre HDPE bottle) and submission of report with data, graph sheet, analysis, etc.

Chemical analysis of water samples for 15 parameters Ph, EC, TH, TDS, Ca, g, Na, K, CO3, HCO3, SO4, NO3, Cl, F, & Fe, in NABL accredited lab and submission of report with NABL lab

Chemical analysis of water samples for Heavy metals Arsenic, Cadium, Mercury, Lead in NABL accredited labs and submission of report with NABL lab certificate

Construction of cement concrete platform 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 mnimu 6 nos. anchoring plate as per drawing

Supply and fitting of well cap with allen key as per drawing. MS Plate size 5 mm embossed & welded with permanent marking by welding method as "CGWB EW" for Exploratory Wells & "CGWB OW" for Observation Wells should be carved with welding on outer surface of casing pipe 0.5mtrs.

Supply and installation of protection 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 (includes EW and OW) in triplicate along with logging graphs, data sheets, analysis sheet, logging graphs, chemical analysis report from NABL lab, site location map and approchability with land marks, photographs/ videos of activities of drilling, assembly lowering, gravel measurement and gravel, well development using compressor and water well discharge, pump lowering, puping test (SDT, APT, PYT), water sample collection, well discharge with discharge measurement / orifice with manometer head, well site with display board well cap, protection box activity for each EW site, etc. The soft copy should be submitted.

R K DRILLING SERVICES

Fugro Geotech (India) Pvt. Ltd.

R K DRILLING SERVICES

Fugro Geotech (India) Pvt. Ltd.