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| 1 | Drilling of pilot hole using bentonite fluidfor Piezometer not larger than 216 mm (8 ½”) by rock roller/ drag bit including formation sample collection at every 3m and change in formation , preparationandsubmission of litholog along with video recordings |
| 2 | Electrical logging using 406 mm and 1626 mm (16\" and 64\") SP resistivity probe, Natural gamma logging , to target depth of minimum 100m submissionof report including zone wise water quality and preparation of composite log along with video recordings |
| 3 | Enlargement of hole by reaming in Pz to accommodatewell assembly of recommended size and gravel envelop of minimum 100 mm thickness as given below |
| 4 | Using 381 mm ( 15”)RR Bit for 150 mm (6”)assembly pipe |
| 5 | Supply and installation of ERW casing pipe conforming to latest version of IS: 4270-2001of diameter and thickness given below |
| 6 | 150 mm (6”) Nominal Bo,re thickness 5.4mm |
| 7 | Supply and installation of LCGV- wire screen conforming to latest version of IS: 8110-2000 of dimensions 150 mm (6”) Nominal Size thicnkness 7mm with slot opening size given below |
| 8 | Slot opening 1.5 mm |
| 9 | Slot opening 1.0 mm |
| 10 | Slot opening 0.75 mm |
| 11 | Supply and shrouding of pea gravel confirming to latest version of IS: 4097-1967 |
| 12 | Particle size range 3.35 mm to 4.75 mm for 1.5 mm slot opening |
| 13 | Particle size range 2.00 mm to 3.35 mm for 1.0 mm and 0.75 mm slot opening |
| 14 | Supply and filling up borehole/ annularspace between casing pipe and bore hole wall with local clay, if required |
| 15 | Development by Air Compressor of adequate capacity forminimum 10 hours, over pumping andby other means till discharge water is clear and free of sand including collection of twowater samples adopting standard procedure in 1 litre HDPE bottle, along with video recordings of compressor hour meter, discharge etc. |
| 16 | chemical analysis of water samples for 15parameters pH, EC, TH, TDS, Ca, Mg, Na, K, CO3, HCO3, SO4, NO3, Cl, F & Fe in NABL accredited labs |
| 17 | chemical analysis of water samples for Heavy metals Arsenic, Uranium in NABL accredited labs |
| 18 | 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 of1:2:4around the housing pipe welded withminimum6Nos of anchoring plate as per drawing |
| 19 | Supply and fitting of well cap as per drawing with Allen Keys.MS Plate size 5 mmembossed & welded with permanent marking of “ CGWB Pz” on wells should carved with welding on outer surface of casing pipe 0.5mtrs |
| 20 | Supply and installation of protection box along with Brass lock (7 lever hardened) and three keys for each lock as per drawing |
| 21 | Supply and installation of Display board as per drawing |
| 22 | Preparation and submission of basic data report per sitein triplicatealong with logging graphs, data sheets, analysis sheet,logging graphs ,chemical analysis report from NABL lab, site location map and approachability with land marks, photographs and videos of activities of drilling, assembly lowering,gravel measurement and gravel packing, well development using compressor and well water discharge, well site with display board well cap, protection box activityfor each site, etc.The soft copy should be submitted.Summary of Pz details in xls format (as per proforma given by CGWB) including details of assembly pipe, screen pipe, static water level, TDS, gravel packing depth and thickness, Lithologetc shouldbe also submitted. |
