24918 version 1
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Describe open cut trench excavation, and the physical implications of
dewatering
Level
3
Credits
3
Purpose
People credited with this unit standard are able to demonstrate knowledge of:
the equipment used, procedures, and safety requirements for, open cut
trench excavation; and the physical implications of dewatering.
This unit standard is for people who work on water, or wastewater, or
stormwater reticulation systems, which collectively make up water reticulation
services.
Subfield
Water Industry
Domain
Water Reticulation
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 24919 replaced unit
standard 19202.
Accreditation
Evaluation of documentation by NZQA and industry.
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
1
References
Legislation relevant to this unit standard includes but is not limited to the Health and
Safety in Employment Act 1992, and Resource Management Act 1991.
Approved Code of Practice for Excavation and Shafts for Foundations, published by
Occupational Safety and Health Service, Department of Labour,
http://www.osh.govt.nz.
 New Zealand Qualifications Authority 2016
24918 version 1
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2
Definition
Organisational procedures – instructions to staff, and procedures which are
documented in memo or manual format and are available in the workplace. These
requirements include but are not limited to – site specific requirements,
manufacturers’ specifications, product quality specifications, and legislative or
regulatory requirements.
Elements and performance criteria
Element 1
Demonstrate knowledge of the equipment used, procedures, and safety requirements for,
open cut trench excavation in accordance with organisational procedures.
Performance criteria
1.1
The equipment used in open cut trench excavation is described in terms of its
purpose, and alternative equipment.
1.2
The sequence of tasks required to excavate a trench using open cut trench
excavation is described in terms of the location of the trench.
Range
location includes but is not limited to – road surface, pavement,
grass.
1.3
The materials excavated are described in terms of their type, excavation
requirements, techniques for handling, and disposal.
1.4
The safety requirements of open cut trench excavation are described in terms of
organisational and legislative requirements, and equipment manufacturer’s
safety instructions.
1.5
Backfilling materials are described in terms of their reasons and suitability for
use, and methods of placement, in specified situations.
Range
1.6
grades, layer depths, types, compaction.
Trench depth is described in terms of the implications for pipe loading.
Element 2
Demonstrate knowledge of the physical implications of dewatering.
Performance criteria
2.1
The physical implications of dewatering are described in terms of the changes
that occur in the surrounding environment.
Range
changes to – the physical characteristics of the ground,
foundations, the water table.
 New Zealand Qualifications Authority 2016
24918 version 1
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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