Elements and Performance Criteria
- Plan and prepare for multiple aquifer production bores
- Access, interpret and apply compliance documentation relevant to the work activity
- Discuss scope of work with client to gain general agreement on drilling plan
- Obtain, confirm and apply work instructions for the allocated task
- Obtain or sight any licences or permits required under the relevant State/Territory legislation or regulation.
- Identify, manage and report all potential hazards
- Resolve coordination requirements with others at the site prior to commencing and during work activities
- Communicate regular up to date information on progress, and/or problems encountered to client and/or other relevant parties
- Provide detailed strata logs, pump and development test results conducted during bore development and water and strata samples to the appropriate authorities
- Complete all requirements for bore completion reports, decommissioning or abandonment and send to regulatory authorities within the time specified on bore licence
- Design production bores for multiple aquifer systems
- Determine most appropriate construction methods from the reading and interpretation of all available documented information and ensure relevant procedures and standards are adhered to
- Design 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
- Select 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
- Select likely water entry mechanism from the formation to the bore such as open hole, slotted casing screens, gravel packs
- Calculate appropriate artificial pack design parameters and recommended annular thicknesses required
- Undertake calculations to determine appropriate screen design parameters (e.g. diameter, length, aperture size)
- Plot and interpret sieve analysis results onto graphs
- Select appropriate bore/surface casing for the anticipated ground/water quality and pressure conditions and any construction requirements
- Ensure all necessary materials anticipated for the job are available and on site prior to commencement of construction phase
- Construct production bores in multiple aquifer systems
- Use approved procedures to assemble and insert casing and screens
- Use equipment for assembly safely and in accordance with approved procedures
- Grout or otherwise seal surface casing
- Conduct grouting operations to seal intermediate and/or production casing strings or to seal selected zones
- Construct bore in accordance with any applicable regulations, minimum construction and organisational requirements
- Maintain plumbness and alignment of the hole within the required limitations
- Collect, record and label formation and water samples
- Maintain records accurately and legibly
- Accurately calculate hole, annular, fill or pack materials and mud pit volumes in cubic metres or litres
- Select and place stabilising gravel fill as required
- Determine appropriate artificial pack material grain size
- Place artificial pack material in a manner that will ensure uniform distribution in the annular space without bridging
- Comply with relevant workplace occupational health and safety requirements for both the drilling equipment and construction materials
- Maintain tool string inventories
- Identify and protect headworks of the bore
- Construct headworks to seal and cap the bore from surface water pollutants, environmental concerns and damage
- Incorporate methods for measuring static and pumping water levels in headworks and for adequate sealing when not in use
- Dispose of wastewater or hazardous materials from site and complete restoration of the bore site
- Develop bore
- Use development techniques with care to prevent collapsing of casing or screens
- Use development techniques to improve hydraulic transmissivity around the bore
- Undertake development until a continuous, clean supply of water is obtained, in accordance with site, contractual or regulatory requirements
- Measure/calculate and record standing and drawdown water levels
- Perform tests to estimate the sustainable yield of the bore
- Disinfect/decontaminate bore and drilling equipment
- Carry out bore maintenance and rehabilitation
- Research all aspects of the bore construction and history
- Undertake a process of diagnosis by testing and measurement to determine likely cause of bore deterioration
- Devise a program of rehabilitation to ensure that the bore is restored to a reasonable condition
- Wear appropriate/recommended personal protective equipment when handling hazardous cleaning chemicals and follow manufacturer's recommendations
- Decommission test/bore holes
- Determine suitable decommissioning procedures and select appropriate sealing materials and placement methods
- Carry out the decommissioning (abandonment) of test holes or bore holes in single and multiple aquifer systems
- Seal bore with surface caps and cover borecap with 300mm local soil
- Verify position/location of hole for future reference
- Dispose of drill and other fluids safely