24950 version 1
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Operate and report on a water treatment plant under supervision
Level
4
Credits
10
Purpose
People credited with this unit standard are able to, for a water treatment plant
explain the overall operation of the plant; complete work routines under
supervision, and complete documentation and report on plant performance.
Subfield
Water Industry
Domain
Water Treatment
Status
Registered
Status date
19 September 2008
Date version published
19 September 2008
Planned review date
31 December 2013
Entry information
Open.
Replacement information
This unit standard and unit standard 24951 replaced unit
standard 17889.
Accreditation
Evaluation of documentation and visit by NZQA, industry
and teaching professional in the same field from another
provider.
Standard setting body (SSB)
Primary Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0179
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
Definitions
Organisational procedures – instructions to staff and procedures which are documented in
memo or manual format and are available in the workplace. These procedures include but
are not limited to – site specific procedures, manufacturers’ specifications, product quality
specifications and reference to legislative or regulatory procedures relevant to the industry.
Water treatment plant – a site where at least two unit process operations are used to
improve raw water quality for the purposes of a potable water supply.
On site – on the site of an operating water treatment plant.
 New Zealand Qualifications Authority 2016
24950 version 1
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Elements and performance criteria
Element 1
Explain the overall operation of a water treatment plant.
Range
in this element, explain means describe the inputs, outputs and controls of the
sections or components to show ability in operating the plant to meet
organisational procedures.
Performance criteria
1.1
The water flow paths through a water treatment plant are physically identified on
site in accordance with organisational procedures.
Range
1.2
The flow control elements are identified and explained on site in accordance
with organisational procedures.
Range
1.3
level, pressure, flow.
The individual plant process sections are identified, and the function of each is
explained, on site in accordance with organisational procedures.
Range
1.4
inflow, outflow, storage, flow distribution in tanks.
process objective, inflows, outflows, physical identification, water
quality changes.
All chemical dosing systems components are identified on a selected site and
the controls of each chemical dosing system are explained in accordance with
organisational procedures.
Range
examples – chemical pipework, dosing pumps, speed control,
stroke control, flow rate, calibration tests, tank dilution, dosage
level, check tests, feedback loops;
solid, liquid, gas.
Element 2
Complete work routines in a water treatment plant under supervision.
Performance criteria
2.1
Routine plant inspections are carried out in accordance with organisational
procedures.
Range
examples – chemical levels, stock levels, output water quality,
process output, vibration, noise, alarm response, manual pump
control, valve operation, filter backwash operation, sludge transfer.
 New Zealand Qualifications Authority 2016
24950 version 1
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2.2
Final water quality is monitored, and plant controls are adjusted to maintain final
water quality, in accordance with organisational procedures.
Range
includes but is not limited to – level and dose settings, instrument
calibration.
Element 3
Complete documentation and report on water treatment plant performance.
Performance criteria
3.1
Process data is collected and recorded in accordance with organisational
procedures.
3.2
Routine reports are compiled from plant and system data in accordance with
organisational procedures.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Primary Industry Training Organisation standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016