Construction of solar powered borehole in ONDO Central senatorial district, ONDO state

WATER

• Provide for reconnaissance, geological, hydrogeological and hydrogeophysical investigation using electrical, magnetic and / or electromagnetic methods to select most suitable site for drilling a productive borehole within the community including reports duly signed and sealed by a COMEG registered Geoscientist. (quantity 1)
• Construction of mud pit, flow channels, rig up activities and dismantling on completion. (quantity 1)
• Mobilisation of equipment, materials and personnel to site and demobilisation on completion of works. (quantity 1)
• Construction of properly labelled sample box, collection of lithologic samples for analysis and submitted to Planning and Design Department. (quantity 1)
• Drilling of 250mm open hole through overburden and weathered rock to the rock head to accommodate 225mm temporary casings (quantity 15)
• Provision, installation and retrieval of temporary casing (225mm) (quantity 15)
• Drilling of 150mm Hole through fractured basement and fresh crystalline rocks from rock head to total depth of 35m (quantity 38)
• Provide and install OD 125mm x 7.5mm (Trapezoidal threaded on both sides – M/F) Slotted UPVC Screen (quantity 38)
• Provide and install OD 125mm x 7.5mm (Trapezoidal threaded on both sides – M/F) Slotted UPVC Screen (quantity 12)
• Provide and place approved uniformly size rice gravel (not granite chipping) (quantity 1)
• Place cement and sand slurry as grout around casing to depth of 4 meters (see attached drawing). (quantity 0.200000002980232)
• Place 0.6m x 1m x 1m mass concrete slab of mix ratio 1:2:4 around the casing (see attached drawing). (quantity 0.600000023841858)
• Development of borehole by backwashing, surging, jetting and airlifting methods until water is clear and sand free and non-turbid. (quantity 1)
• Pumping test of well for at least 24 hours (Constant pumping rate test) by a COMEG certified Hydrogeologist including two copies of report. Report should be submitted within one weeks of conducting the test. (quantity 1)
• Provide for chemical and microbiological analysis of water sample from the borehole at the client’s approved laboratory. Water sample to be collected by Client’s Representative. (Provisional Sum) (quantity 1)
• Provide for four copies of complete technical reports including progress photographs to be collated by the client. (quantity 1)
• Provide and install Solar Powered Submersible pump SQ Flex series with solar modules to a total capacity of 1600W, 120 metres standard quality cable, cable joint kit and construction of support steel structure. (quantity 1)
• Provision of well head, pipe connection, valve, plug for water metre and wash out (quantity 1)
• Provide for the construction of protective cage against theft of borehole submersible pump ( See attached drawing) (quantity 1)
• Provide for the construction of protective operational switch box for the solar panel switch (See attached drawing) (quantity 1)
• Supply and install UPVC riser pipes 16 bar with threaded M/F joint and diameter of 31.25mm. (quantity 50)
• Allow for supply and installation of pressure gauge and flow meter (Provisional Sum) (quantity 1)
• Clear site of all bushes vegetation trees and rubbish including grubbing out root and dispose as directed (quantity 100)
• Excavation of existing soil to maximum of 1.5m for isolated pad footing (quantity 2.5)
• Backfill and compact (quantity 0.5)
• Remove surplus excavated material from site for re-use (quantity 2)
• 50mm thick blinding with concrete of 1:3:6 mix (quantity 0.5)
• Formwork-generally plain finish on vertical sides of bases and column (quantity 1)
• 12mm diameter reinforcement bar (quantity 120)
• 12mm diameter reinforcement bar (quantity 3.59999990463257)
• 20mm diameter x 750mm long hold down bolt embedded in the column base (quantity 16)
• Removal of form work from casing and subsequent removal from site (quantity 1)
• 20mm mild steel base plate 352mm x 352mm welded to the stanchion base (quantity 4)
• 10mm mild steel plate as end cap (quantity 4)
• 152mm x 152mm x 30Kg/m UC Stanchion 6.0m long each (quantity 24)
• 60mm x 60mm x 5mm thick equal angle horizontal bracing (quantity 24)
• 60mm x 60mm x 5mm thick equal angle horizontal bracing (quantity 8)
• 60mm x 60mm x 5mm thick equal angle horizontal bracing (quantity 8)
• 203mm x 133mm x 25Kg/m UB in primary beam in platform of tower each 4.4m long (quantity 8.80000019073486)
• 152mm x 89mm x 16Kg/m UB in secondary beam in platform of tower each 4.4m long (quantity 26.3999996185303)
• 3mm thick mild steel chequered plate on platform and landing (quantity 9)
• Provide, fabricate and erect steel ladder with hoops (quantity 1)
• Provide, fabricate and erect hand rail to cat walk to Engineer specifications (quantity 1)
• 300mm x 150mm x 8mm thick mild steel gusset plate (quantity 16)
• 300mm x 300mm x 8mm thick mild steel gusset plate (quantity 12)
• 600mm x 150mm x 8mm thick mild steel gusset plate (quantity 16)
• 16mm diameter bolt complete with nut and washer for gusset plate (quantity 1)
• Painting work with two coats of red oxide and aluminium (quantity 1)
• Supply and erection of corrugated steel tank of capacity 22.5 cubic meters from not less than 4mm thick mild steel plate together with cover internally braced. Externally flanged complete with all necessary accessories. Bolts, nuts, washers, manhole. Water level indicator, etc. (quantity 1)
• Transportation of all fabricated components to site (quantity 1)
• Supply and fix a complete set of plumbing pipes and fittings to water tank of 6m structure steel tower inlet and outlet piping system plus washout and overflow. All pipes to be UPVC 16 bars (quantity 1)
• Supply and fix a complete set of plumbing pipes and fittings to water tank of 6m structure steel tower inlet and outlet piping system plus washout and overflow. All pipes to be UPVC 16 bars (quantity 1)
• Provide and install 40 metres chain linked perimeter fence (3mm thick and 2.4m high wire gauze) mounted on two (3Nos.) courses of rendered block wall in 100mm thick concrete foundation. Chain link fence braced vertically at 3metres centre to centre & horizontally at the top with 50mm galvanized steel pipe. (quantity 1)
• Provision of ten service taps as collection point and connection to borehole in concrete platform with 150mm PVC floor drain connected to 1.2 x 1.2 x 1.5m deep, soak away pit as directed by the Engineer (quantity 1)

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