Central Ground Water Board-CGWB has published Tender For Construction Of Piezometers 250 Nos In Soft Rock/ Hard Rock And Supply, Installation, Commissioning Of Dwlrs And Telemetry, Establishment Of Data Acquisition System And Its Maintenance For Real Time Ground Water Level Monitoring. Submission Date for this Tender is 16-05-2023. Computer Peripheral Tenders in faridabad Haryana. Bidders can get complete Tender details and download the document.
| Sr No | CorrigendumDate | Corrignedum | CorrigendumType | NewSubmissionDate |
| 1 | 27-Mar-2023 | Corrigendum -1 | Date | 27-04-2023 |
| 2 | 18-Apr-2023 | Corrigendum No. 2 | Technical Bid | 27-04-2023 |
| 3 | 27-Apr-2023 | Corrigendum 3 | Date | 08-05-2023 |
| 4 | 28-Apr-2023 | Corrigendum 3 (Revised) | Technical Bid | 08-05-2023 |
| 5 | 01-May-2023 | Corrigendum 4 | Technical Bid | 08-05-2023 |
| 6 | 09-May-2023 | Corrigendum No. 5 | Date | 16-05-2023 |
| Sl. No. | Item Description |
| 1 | Drilling of pilot hole using bentonite fluidfor PZ 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 |
| 2 | Electrical logging using 406 mm and 1626 mm (16" and 64") SP resistivity probe, Natural Gamma Logging to target depth of max. 155 m, submission of report including zone-wise water quality, logging graph, interpretation of graph, generation of composite log along with video recording |
| 3 | Enlargement of hole by reaming in Piezometer toaccommodatewell assembly of recommended size and gravel envelop of minimum 100 mm thickness as given below |
| 4 | Using 311.15 mm ( 12-1/4”) RR Bit for 100 mm (4”)assembly pipe |
| 5 | Supply and installation of ERW casing pipe conforming to latest version of IS: 4270-2001of diameter and thickness given below |
| 6 | 100 mm (4”) Nominal Bore, thickness 5.4mm |
| 7 | " Supply and intallation of Stainless Steel 4"(100 mm) dia. x 0.75 mm slot size regular Grade ERW Stainless Steel Cage Type V-wire wound screen as per IS :8110-95 and material specifications as per AISI type 304, Grade SS -304 suitable for water well construction |
| 8 | Slot opening 0.75 mm (Stainless Steel SS304 Grade) |
| 9 | Supply and shrouding of pea gravel confirming to latest version of IS: 4097-1967 |
| 10 | Particle size range 2.00 mm to 3.35 mm for 1.0 mm and 0.75 mm slot opening |
| 11 | Supply and filling up borehole/ annularspace between casing pipe and bore hole wall with local clay, if required |
| 12 | Development by Air Compressor of adequate capacity forminimum 5 hours, over pumping andby other means till discharge water is clear and free of sand including collection of twowater samples from PZ welladopting standard procedure in 1 litre HDPE bottle, along with video recordings of compressor hour meter, discharge etc. |
| 13 | 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 |
| 14 | Chemical analysis of water samples for Heavy metals (As, U) in NABL accredited labs and submission of report from NABL lab |
| 15 | Construction of cement concrete platformof dimension 0.70 X 0.70 X 0.60 m (0.30 m above ground level) using concrete mix of1:2:4around the around the Piezometer well welded with minimum6Nos of anchoring plate as per drawing |
| 16 | Supply and fitting of well cap as per drawing with Allen Keys.MS Plate size 5 mmembossed & welded with permanent marking of “ CGWB PZ” should be carved with welding on outer surface of casing pipe |
| 17 | Supply and installation of protection boxmade of 3 mm GI sheet of Size: 550mm X450mm X530mm along with Brass lock (7 lever hardened) and three keys for each lock as per drawing |
| 18 | Supply and installation of Display board as per drawing |
| 19 | Preparation and submission of basic data report per site in triplicatealong with data sheets, analysis sheet, chemical analysis report from NABL lab, site location map and approachability with landmarks, photographs and videos of activities of drilling, assembly lowering,gravel measurement and gravel packing, well development using compressor and well water discharge, water sample collection, welldischarge with discharge measurement, well site with display board, well cap, protection box for each site, etc.The soft copy as well as hard copyshould be submitted. Summary of Piezometer details in xls format (as per proforma given by CGWB) including details of dia and depth of assembly pipe, screen pipe, static water level, gravel packing depth and thickness, Litholog etc. shouldbe also submitted. |
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