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Elements and Performance Criteria

  1. Plan and prepare for multiple aquifer production bores
  2. Design production bores for multiple aquifer systems
  3. Construct production bores in multiple aquifer systems
  4. Develop bore
  5. Disinfect/decontaminate bore and drilling equipment
  6. Carry out bore maintenance and rehabilitation
  7. Decommission test/bore holes
  8. Plan and prepare for multiple aquifer production bores
  9. Design production bores for multiple aquifer systems
  10. Construct production bores in multiple aquifer systems
  11. Develop bore
  12. Disinfect/decontaminate bore and drilling equipment
  13. Carry out bore maintenance and rehabilitation
  14. Decommission test/bore holes

Performance Evidence

Evidence is required to be collected that demonstrates a candidate’s competency in this unit. Evidence must be relevant to the roles within this sector’s work operations and satisfy all of the requirements of the performance criteria of this unit and include evidence that the candidate:

locates and applies relevant legislation, documentation, policies and procedures

implements the requirements, procedures and techniques for the safe, effective and efficient completion of multiple aquifer production bore construction including:

performing aquifer sand sieve analysis tests

calculating the specific capacity of a bore

calculating grout component quantities, i.e. cement powder, water and other additives as required

calculating hole and annular volumes

calculating grout/mud specific gravity

determining grain size and selection of appropriate artificial pack material

works effectively with others to undertake and complete the construction of multiple aquifer production bores that meets all of the required outcomes including:

complying with written and verbal reporting requirements and procedures

communicating clearly and concisely with others to receive and clarify work instructions

communicating clearly and concisely with others to resolve coordination requirements prior to commencing and during work activities

demonstrates completion of the construction of multiple aquifer production bores that safely, effectively and efficiently meets all of the required outcomes on more than one (1) occasion including:

designing the bore to ensure the exclusion of unsuitable waters and to prevent the inter-mixing of aquifers with different water quality or Standing Water Levels

selecting a bore site that will prevent contamination and minimise interference with other bores and that is safe with respect to potential occupational health and safety hazards

selecting likely water entry mechanism from the formation to the bore such as open hole, slotted casing screens, gravel packs

assembling and inserting casing and screens

completing grouting operations to seal intermediate and/or production casing strings or to seal selected zones

maintaining plumbness and alignment of the hole within the required limitations

continuing development until a continuous, clean supply of water is obtained, in accordance with site, contractual or regulatory requirements

performing tests to estimate the sustainable yield of the bore


Knowledge Evidence

The candidate must demonstrate knowledge in constructing multiple aquifer production bores through:

work, health and safety

environmental issues

operating drill rig

housekeeping

identifying with the equipment characteristics, technical capabilities and limitations

testing for alignment and plumbness of bores

hole preparation for cementing (grouting) operations

effects of various cement (grout) additives

pressure cementing methods

casing collapse characteristics

applications for wire-wound screens

screen design parameters to ensure appropriate entrance velocities

interpreting the sieve analysis results

observing the objectives of bore development

types of drilling fluids

grout placement methods and procedures

range of numerical calculations to calculate:

volume (e.g. mud pits, drums, tanks or bore holes of given dimensions, annulus)

up hole velocity

cement/water/additives quantities

screen design parameters

flow rates (e.g. L/sec, GPM)

conversion from imperial to metric and vice versa

conducting a sieve analysis

understanding the appropriate fishing operations for the type(s) of drilling being undertaken

reading, interpreting and applying the required safety data sheets (SDS)

being prepared for fire/accident/emergency