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Tenders are invited for Drilling of 5 Boreholes Installed with Solar Powered System Drilling 1 borehole to Solar Powered with Installation 6m height x 5cu.m solar water scheme. with 5,000 liters Storage Tank Supplying 5 Tap Heads to Serve 5000 People and School Gardens. ForAfrika invites legally registered and qualified drilling companies to submit sealed bids for the drilling and installation of five (5) solar-powered boreholes in Warrap State, South Sudan. Interested bidders are encouraged to review the attached bidding documents for detailed technical specifications, borehole locations, eligibility requirements, and submission instructions. For complete details regarding the scope of work, technical specifications, borehole locations, and bid submission requirements, please refer to the attached tender documents. Good Luck! Procurement Unit Mo PRELIMINARIES AND DRILL personnel to site Conduct geophysical survey (field work, interpretation and report) for the location of borehole at a suitable site use geo-electrical sounding (VES, vertical electrical sounding), profiling (CST, constant separation traversing) arethe standard (*),and electrical resistivity tomography (ERT) 2 BORE HOLE DRILLING WORKS 2.1 Drilling of borehole Conduct confirmatory geophysical survey (field work, interpretation and report) for the location of borehole at a suitable site use geoelectrical sounding 2.2 (VES, vertical electrical sounding), profiling (CST, constant separation traversing) are the standard (*), and electrical resistivity tomography (ERT)- atleast 4 points 2.3 2 2. Drilling of 6.3 ir 0.02 mm)dia open hole through basement/ Sedimentary formation, to accommodate 5 inches (127 mm) dia permanent casing, includingall drilling fluids and lubricants, disposal of excavated material taking any reme overcome caving in or over drilling to accommodate sloughed materials and keeping drilling record as specified between ground level and 30m below ground level. Allow for taking sample of drillcuttings at two (2m) intervals through out the drilling Bore Hole installation Supply and install 5"16ba Cthreaded joint uPVC slotted casing 5" in diameter (internal diameter) with minimum thickness of 3mm and 3m length. pply and install 5"16bar PVC threaded Joint uPVC solid plain casing 5" in diameter (internal diameter) with minimum thickness of 3mm Supply and installation of filter gravel pack. (average dept 140m and standard thickness 50mm siliceous, rounded with diameter of 2.0-4.0 mm depending on screen Backfilling wall, annulus and casings, back filling and, sealing abortive borehole 2.8 if 2.11 2.13 applicable Borehole development Flushingand development of borehole by airlifting, jetting, and pumping to attain optimum yield and clean water for minimum of 8 hours including measurements, records and proper disposal of water and in the presence of ForAfrika Engineer y and place cement grout in borehole anulus aronud the casing and struction of concrete slab around the well cap (minimum of 10m depth Constr Pumping Tests and Water Quality Analysi Execution of Step Drawdown Test t ell (Min 8 hrs) with 4 steps (2hr each) of increasing yields and endin cu.m/h followed by 12 hours) and nability yield uding measurement of GW level and yield, recording of EC, pH e of the every hour during pumpping.A pump ith allequipments (generators, cables, discharge hose of 100m to afe disposal of water from borehole and other anciliary materials), incl measurement and records of wate submission of data in digital form and printouts (data sheet and graphs) Details: Drilling of 5 water yards installed with solar-powered systems (3 water yards in Gogrial West and 2 water yards in Twic County). Funding: Self-funded by ForAfrika (Bids to be quoted in USD ($)) Tender Link : https://comms.southsudanngoforum.org/c/tenders
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