Scope of Work on Borehole Drilling and Construction Schedule
Water Tech provides all necessary equipment, materials and personnel for the completion of the entire Construction and other testing works. The borehole shall be drilled by Direct Circulation Rotary Method. The casings and gravel material shall be PVC material, non toxic, non corrodible, non taint and
Internationally approved for portable water use. The gravel pack material shall consist of durable rounded quartzitic particles.. The gravel pack material shall be washed and clean prior to emplacement into the borehole. The gradation of gravel pack shall be 1:2 mm Our drilling rigs has the capacity of drilling the diameters and depths of hole to 250 mm X 150 meters and 300 mm X 200 meters respectively.
Water tech carries out airlifting by using air compressor to flushed/cleaned the borehole upon completion of casing and graveling. This is to remove the drilling fluid and enhance the permeability of the water bearing formation.
Water tech carries out airlifting by using air compressor to flushed/cleaned the borehole upon completion of casing and graveling. This is to remove the drilling fluid and enhance the permeability of the water bearing formation.
Water Tech conducts borehole pumping tests in different stages comprising of step test at different rates of discharges and constant discharge test, followed by a recovery test. This is to provide vital information on the performance characteristic of the borehole.
Water Tech provides approved equipment on site for the measurement of the following key physical parameters:
- Electrical conductivity in micro ohms/cm
- pH in units 1-14
- Temperatures in degrees Celsius
- Salinity
- Total Dissolve Solid
Measurement of sand content shall be carried out and be determined
Full water analyses shall be carried out from a recognized water laboratory
Not more than 7 working days after the completion of all works, Water Tech shall submit to the client a completion report including pumping test data, pumping test curves, Borehole construction diagram, water quality analysis report and all other necessary information.