Central Ground Water Board Tender

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

Supply and installation of ERW casing pipe conforming to Table 3 of latest version of IS: 4270-2001

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 thicnkness 7mm with slot opening size 1.0 mm

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

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

Supply and filling up borehole/ annular space between casing pipe and bore hole wall with clay balls

Development by Air Compressor of adequate capacity for minimum 5 hours and by other means till discharge water is clear and free of sand and PYT test (100 min) including collection of 4 water samples (two each for Basic and Heavy metals) from PZ adopting standard procedure in 1 litre HDPE bottle.

chemical analysis of water samples for 15 parameters pH, EC, TH, Ca, Mg, Na, K, CO3, HCO3, SO4, NO3, Cl, F, PO4 & Si in NABL accredited labs and submission of report from NABL lab

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 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 PZ” for Piezometer wells should carved with welding on outer surface of casing pipe 0.5mtrs

Supply and installation of protection box made of 3.13 mm GI sheet of size: 650 mm X 550 mm X 530mm along with Brass lock (7 lever hardened) and three keys for each lock.

Supply and installation of Display board

Preparation and submission of basic data report per PZ in triplicate along with logging graphs, data sheets, analysis sheet,logging graphs ,Well Diagram, 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, 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 PZ, etc.The soft copy as well as hard copy should be submitted. Summary of wells details in xls format including details of dia and depth, housing pipe, assembly pipe, screen pipe, static water level, TDS, aquifer parameter, safe discharge, grvael packing depth and thickness etc. should be also submitted.