Central Ground Water Board Tender

Using 558 mm (22" ) Bit for 300 mm (12” ) assembly pipe

Using 381 mm ( 15" ) Bit for 150 mm (6” ) assembly pipe

Drilling of Hole for OW by rock roller/ drag bit of size given below to accommodate well assembly of recommended size and gravel envelop of minimum 100 mm thickness, including sample collection and preparation of litholog along with video recordings

Using 381 mm ( 15”) Bit for 150 mm (6”) assembly pipe

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

300 mm (12” ) Nominal Bore thickness 7.1mm

150 mm (6”) Nominal Bore thickness 5.4mm

Supply and installation of LCG V- wire screen conforming to latest version of IS: 8110-2000 of dimensions given below

150 mm (6”) Nominal Size thickness 7.1mm with slot opening size given below

Slot opening 1.0 mm

Slot opening 0.75 mm

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

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

Cement sealing using53 grade cement of 5 m thickness including im thick fine sand/ clay between cement seal and Gravel pack.

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 20 hours, over pumping end by other means till discharge water is clear and free of sand including collection of one Nos. of water sample in 1 lit good quality HDPE bottle for basic parameters and 1 no of water sample for heavy metal in 125 ml good quality HDPE bottle following standard procedure from OW, along with video recordings of compressor hour meter, discharge etc.

Pumping test

SDT (4 Steps, 60 minute each) including collection of 2 Nos. of water sample in 1 lit good quality HDPE bottle following standard procedure for basic parameters and 1 no of water sample for heavy metal in 125 ml good quality HDPE bottle and submission of pump test data along with analysis report and also video recording and photographs of manometer reading, lowering of well assembly, diameter of orifice plate

APT (1000 mm) including recovery of 90 to 100% and includes pre-pumping for 8 Hrs and recuperation for 24 Hrs , collection of 2 Nos. of water sample in 1 lit good quality HDPE bottle following standard procedure for basic parameters and 1 no of water sample for heavy metal in 125 ml good quality HDPE bottle)and submission of pump test data along with analysis report also videorecording and photographs of manometer reading, lowering of well assembly,diameter of orifice plate

Chemical analysis of water samples for 15 parameters pH, EC, TH, TDS, Ca, Mg, Na, K, C03, HCO3, S04, N03, Cl, F & Si02 in NABL accredited lab

Chemical analysis of water samples for Heavy metals in NABL accredited lab for 10 parameter Cu,Cr, Pb,Zn,Fe,Mn,As,Se, Ni, U

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 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 EW” for Exploratory Wells & “CGWB OW” for Observation wells should carved with welding on outer surface of casing pipe 0.5 mtrs

Supply and installation of protection box along with Brass lock (7 lever hardened) and 03 (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, chemical analysis report from NABL lab, site location map and approachability with land marks, photographs, videos of activities of drilling, assembly lowering, gravel measurement and gravel packing, well development using compressor and well water discharge, pump lowering, pumping 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. Summary of wells details in xls format (as per proforma given by CGWB) including details of dia and depth housing pipe, assembly pipe, screen pipe, static water level, TDS, aquifer parameters, safe discharge, results of sieve analysis,gravel packing depth and thickness, Litholog etc should be also submitted.