17320 version 2
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Supervise civil construction earthworks
Level
4
Credits
15
Purpose
People credited with this unit standard are able to: estimate quantities of
material to be excavated and calculate haul distances; interpret machine
performance tables; plan the utilisation of earthmoving plant and equipment;
describe the control of surface drainage at earthworks; describe specific
requirements for excavation sites; and supervise earthworks operations.
Subfield
Civil Works and Services
Domain
Civil Construction Supervision
Status
Registered
Status date
25 September 2006
Date version published
25 September 2006
Planned review date
31 December 2012
Entry information
Recommended: Unit 12564, Supervise earthworks
preparation for civil construction; or demonstrate
equivalent knowledge and skills.
Replacement information
This unit standard replaced unit standard 6444.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Infrastructure ITO
Accreditation and Moderation Action Plan (AMAP) reference
0101
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
The following legislation and regulations must be complied with: Health and Safety in
Employment Act 1992; Health and Safety in Employment Regulations 1995; and
Resource Management Act 1991.
 New Zealand Qualifications Authority 2016
17320 version 2
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2
Assessment against this unit standard must take place in a workplace environment.
Assessment parameters will be dependent on company and site specific equipment,
procedures, and practices. Practices must reflect industry best practice and comply
with legislative requirements.
3
The requirements within the following codes of practice and guidelines applying to
civil construction operations must be complied with as appropriate to the context of
assessment for this unit standard: The Official New Zealand Truck Loading Code,
LTSA (Auckland: MacMillan, 1999) ISBN: 047306104X available from local book
shops published by Land Transport NZ; Operator Safety Manual for Earthmoving
Machinery, 2002 available from Infrastructure ITO http://www.infrastructureito.org.nz;
and the New Zealand Contractors Federation, http://www.nzcontractors.co.nz;
Approved Code of Practice for Safety in Excavation and Shafts for Foundations
(Wellington: Department of Labour, 1995) available from the Occupational, Safety
and Health service http://www.osh.dol.govt.nz/order/catalogue/135.shtml.
4
Definitions
Company requirements include the policy, procedures, and methodologies of the
company. They include legislative and regulatory requirements which may apply
across the company or to a specific site. Requirements are documented in the
company’s health and safety plans, traffic management plans, contract work
programmes, quality assurance programmes, policies, and procedural documents.
Contract specifications include plans, diagrams, and special technical conditions.
They do not include special administrative conditions.
Technical procedures mean the procedures and or diagrams for the carrying out of a
construction process.
Notifiable work is defined by the Health and Safety in Employment Regulations 1995
as:
a
Any restricted work, as that term is defined in regulation 2 (1) of the [Health and
Safety in Employment (Asbestos) Regulations 1998];
b
Any logging operation or tree-felling operation, being an operation that is
undertaken for commercial purposes;
c
Any construction work of one or more of the following kinds:
i
Work in which a risk arises that any person may fall 5 metres or more,
other thanA
Work in connection with a residential building up to and including 2
full storeys:
B
Work on overhead telecommunications lines and overhead power
lines:
C
Work carried out from a ladder only:
D
Maintenance and repair work of a minor or routine nature:
ii
The erection or dismantling of scaffolding from which any person may fall
5 metres or more:
iii
Work using a lifting appliance where the appliance has to lift a mass of
500 kilograms or more a vertical distance of 5 metres or more, other than
work using an excavator, a fork-lift, or a self-propelled mobile crane:
iv
Work in any pit, shaft, trench, or other excavation in which any person is
required to work in a space more than 1.5 metres deep and having a
depth greater than the horizontal width at the top:
v
Work in any drive, excavation, or heading in which any person is required
to work with a ground cover overhead:
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5
Work in any excavation in which any face has a vertical height of more
than 5 metres and an average slope steeper than a ratio of 1 horizontal to
2 vertical:
Work in which any explosive is used or in which any explosive is kept on
the site for the purpose of being used:
Work in which any person breathes air that is or has been compressed or
a respiratory medium other than air.
Machine manufacturer’s manuals provide performance tables for comparing different
items of plant.
Elements and performance criteria
Element 1
Estimate quantities of material to be excavated and calculate haul distances.
Performance criteria
1.1
Contour maps are used to estimate quantities of excavation material.
Range
rectangular areas of similar topography, average heights
determined from corners of rectangular sections.
1.2
Drawings of profiles and cross-sections are used to calculate quantities of
excavation material.
1.3
Average haul distances are calculated between cuts and fills.
1.4
Optimum locations of stockpiles and/or dumps are determined using average
haul distances, quantities of material, and machine capacity.
1.5
Economical hauls are determined using costs of excavating and hauling, and
comparing spoiling, and borrowing options with solely cut-to-fill.
Element 2
Interpret machine performance tables.
Performance criteria
2.1
Gradeability performance of items of plant is determined from grade and rolling
resistance tables.
Range
2.2
wheeled, tracked.
Comparison of performance tables for wheeled and tracked vehicles identifies
plant working conditions, effect on ground, and suitability for tasks involved.
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2.3
Machine manufacturer’s production tables are interpreted in relation to
comparing productivity of available machines.
Range
tables – total mass, speed, rimpull, drawbar pull, breakout force,
bucket type and size;
machines – wheeled, tracked.
Element 3
Plan the utilisation of earthmoving plant and equipment.
Performance criteria
3.1
Factors impacting on productivity of machinery are determined from site visit,
and initial selection of plant and equipment is made.
Range
may include but is not limited to – types of soil, type of excavation,
site restrictions, proximity to labour, materials, supplies, repair
facilities, altitude, weather.
3.2
Total cycle times are calculated using average haul distance, haul-and-return
time, and manoeuvre, dump, and wait times.
3.3
Production costs are calculated from payload capacities, recycle times, number
of cycles per hour, and operating costs.
Range
comparison of different combinations of plant.
3.4
Overhead costs are determined from company documentation.
3.5
Final selection of plant and equipment is based on total cost of each item of
machinery involved, and its suitability for the type of work.
Range
production costs, overheads.
Element 4
Describe the control of surface drainage at earthworks.
Performance criteria
4.1
Description identifies reasons for and methods of controlling natural drainage
and surface run-off during earthworks.
Range
reasons include but are not limited to – instability of cut and fill
areas, Resource Management Act 1991 and Territorial Resource
Management Plan, local authority requirements;
control includes but is not limited to – location of outlets.
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4.2
Description identifies progressive shaping and rolling to waterproof earthworks
and explains the importance of waterproofing in different site conditions.
Range
4.3
Description identifies temporary drainage systems for use during operations.
Range
4.4
conditions – soil type, height of excavation, weather.
includes but is not limited to – materials, silt ponds, vee-drains,
temporary piping.
Description identifies components of permanent drainage control systems and
stages at which these may be installed in accordance with contract
specifications.
Element 5
Describe specific requirements for excavation sites.
Performance criteria
5.1
Notifiable works are identified in accordance with Health and Safety in
Employment Act 1992 and Health and Safety in Employment Regulations 1995.
5.2
Concept of safe slope is described for different types of soils in terms of the
degree of arc from horizontal.
Range
5.3
Methods of securing slopes for safety are described in accordance with
technical procedures and their uses are compared for cohesive and noncohesive soils.
Range
5.4
three of the following – boulders, screened gravel, gravel, sand,
silt, clay, pumice, scoria.
compaction, cementing, protection, supporting.
Methods of temporarily supporting cut faces and increasing their stability are
described in accordance with technical procedures, and their suitability for
different sites is compared.
Range
timber shoring, sheet piles, surface membranes, rock bolting,
grouting.
Element 6
Supervise earthworks operations.
Performance criteria
6.1
Productivity targets and monitoring systems are confirmed in accordance with
company requirements.
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6.2
Workflow for operations is organised to achieve minimal waste and delay.
Range
6.3
Productivity is measured in accordance with company requirements.
Range
6.4
time sheets, machine hours, tally dockets, productivity analysis.
Resources are organised to meet job targets in accordance with contract
specifications.
Range
6.5
includes but is not limited to – contingency plans for adverse
weather, unsuitable material and its replacement.
signage, site facilities, labour, materials, plant, equipment, fuels.
Quality assurance systems for earthmoving projects are implemented in
accordance with company requirements.
Please note
Providers must be accredited by the Qualifications Authority, 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 the Qualifications Authority 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 Infrastructure ITO askus@infratrain.co.nz if you wish to suggest changes to
the content of this unit standard.
 New Zealand Qualifications Authority 2016