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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Plan and design for the construction of single aquifer bores
   • Obtain, interpret and confirm work requirements
   • Access, interpret and apply single aquifer drilling documentation and confirm work activity is compliant
   • Identify and minimise environmental issues and potential hazards, and assess and address risks within scope of own role and according to workplace procedures
   • Site a bore and design single aquifer bore in accordance with work and legislative requirements
   • Select and wear personal protective equipment required for work activity
   • Communicate with other personnel at site according to work requirements and confirm briefings and handover details are communicated and received
   • Select required drilling method for site geology
2. Construct and develop single aquifer bores in line with established requirements
   • Drill and isolate target production zone from other formations
   • Log strata encountered during drilling according to workplace procedures
   • Confirm or amend bore design based on testing and encountered geology
   • Construct bore according to confirmed or amended design using simple construction techniques
   • Undertake bore development until a continuous, clean supply of water is obtained, in accordance with acceptable and practical limits set by site, contractual or regulatory requirements
   • Estimate yield by using yield testing methodologies
   • Complete written bore construction record according to workplace procedures
3. Disinfect/decontaminate bore and drilling equipment in line with established requirements
   • Determine and monitor potential contaminants of drilling equipment
   • Disinfect/decontaminate bores and installed equipment constructed for potable supplies
4. Decommission bore holes in line with established requirements
   • Determine suitable decommissioning procedures for failed or unwanted bores and select appropriate materials
   • Seal the bore as per legislative requirements

Performance Evidence

The candidate must demonstrate the ability to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including evidence of the ability to:

construct single aquifer bores on at least three occasions, including:

planning and preparing for the construction of single aquifer bores, including:

discussing and agreeing scope of work with client, including cost structure, workmanship warranty, quantity and quality of materials, construction standards and methods to be used

selecting a bore site to prevent contamination and minimise interference with other bores

designing a single aquifer bore and determining construction method to ensure the exclusion of surface water ingress and screening the correct zone of strata for a water supply or groundwater monitoring purposes.

constructing and developing single aquifer bores in line with established requirements, including:

confirming or amending bore design based on encountered geology, using:

lithological logging

bore yield testing

water quality testing

selecting likely water entry mechanism from the formation to the bore including stainless steel screens, filter packs, slotted casing, and open hole

calculating and making up cement grout volumes and mixing grout component quantities, including:

cement powder

water

bentonite

calculating hole and annular volumes

calculating grout specific gravity

constructing bore according to confirmed or amended design, including:

assembling and installing casings, seals and screens

installing filter pack

grouting

confirming or amending bore design based on encountered geology, using:

lithological logging

aquifer yields testing

water quality testing

continuing development until a continuous, clean supply of water is obtained.

estimating yield by using methodologies of:

air lifting

pumping

disinfecting/decontaminating bore and drilling equipment in line with established requirements, including:

disinfecting bores and installed equipment using proprietary chemical solution

decommissioning bore holes in line with established requirements

decommission single aquifer failed or unwanted bores as required.

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Knowledge Evidence

The candidate must be able to demonstrate knowledge to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including knowledge of:

key legislation required to construct single aquifer bores

key policies, procedures and established requirements for constructing single aquifer bores, including those for:

Minimum Construction Requirements (MCR)

contractual agreements with clients

workplace health and safety

environmental practice

accidents and emergencies

safety data sheets (SDS)

housekeeping

key factors affecting multiple aquifer production bore performance, including:

objectives of bore development

properties, uses and effects of and differences between:

single and multiple aquifers

casings

bore water entry designs (screens, filter packs, slotted casing, open hole)

cement (grout) make up components

tremie pipe grout placement methods and procedures

hole preparation for cementing (grouting) operations

calculations for:

volume (including tanks or bore holes of given dimensions and annulus)

flow rates

conversion from imperial to metric and vice versa

equipment processes, technical capability and limitations

casing strength characteristics

ways in which sampling errors can occur

yield testing procedures

applications for different types of filter packs (artificial pack, natural pack) and completion techniques

characteristics of ‘good samples’ required for water well construction

types of pathogens and contaminants including bacteria

key site information, including:

basic geological formations, including soil and rock classifications, which permit groundwater movement

bore construction reporting.

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