NZQA registered unit standard
28709 version 1
Page 1 of 4
Title
Interpret paving instructions and construct slurry surfacings
Level
4
Credits
14
Purpose
People credited with this unit standard are able to: interpret
paving instructions for slurry surfacings; prepare to construct
slurry surfacings, and construct slurry surfacings.
Classification
Infrastructure Works > Bitumen Surfacing Construction
Available grade
Achieved
Explanatory notes
1
The following requirements apply to this unit standard, and must be complied with:
Code of Practice for Temporary Traffic Management (CoPTTM), New Zealand
Transport Agency, available at http://www.nzta.govt.nz;
RNZ 9806, Specification for Slurry Surfacings RNZ 9806: June 2010, Roading New
Zealand, available at http://www.nzcontractors.co.nz;
ISSA A105 Recommended Performance Guideline for Emulsified Asphalt Slurry Seal
A105 (Revised February 2010) International Slurry Surfacing Association available at
http://www.slurry.org;
ISSA A143 Recommended Performance Guideline For Micro Surfacing A143
(Revised February 2010), International Slurry Surfacing Association available at
http://www.slurry.org;
Site safety plan;
Contract quality plan;
Slurry surfacing plan.
2
Assessment against this unit standard must be based on evidence from a workplace
context.
3
Definitions
Company procedures refers to all documented policies, procedures, and
methodologies of the candidate’s employer at the time of training, including but not
limited to those relating to health, safety, environment, quality, and operations.
Job Mix Formula means the target grading, binder quantity, and properties of the
proposed slurry.
Slurry surfacing is the generic term for a mix of asphalt emulsion binder, crushed
aggregate, and stabilising filler. A development of slurry using a polymer modified
binder and selected aggregates is known as micro surfacing.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28709 version 1
Page 2 of 4
Outcomes and evidence requirements
Outcome 1
Interpret paving instructions for slurry surfacings.
Range
paving instructions may be in contract specifications and/or plans, tender
documents, and site instructions;
instructions for three jobs with various requirements such as different:
clients – such as state highway, runway, local authority street;
slurry types – such as rut fill, cape seal.
Evidence requirements
1.1
Pre-treatment requirements are identified in site instructions and explained in
terms of what is required to meet them.
Range
1.2
Plant and equipment requirements are identified in paving instructions and
explained in terms of selecting what is appropriate and available for each job.
Range
1.3
delivery vehicles, slurry machine, rut box, surface preparation
equipment, broom, loader, hand tools.
Laying specifications are identified in paving instructions and explained in terms
how the specifications can be met.
Range
1.4
sweeping, tack coat, membrane seal, patching, pre-levelling.
specifications relating to – pavement temperature, air temperature,
possibility of freezing, rain, mix design, recipe, application rate,
thickness, spreading, trimming, joints, edges, shoulders.
Paving instructions for a parking area are interpreted in terms of compaction
requirements and procedures.
Range
application rate recipe, roller type and weight, water, critical timing,
number of passes.
1.5
Site safety and environmental protection factors are identified in paving
instructions and explained in terms of requirements for each job.
1.6
Sampling and testing requirements for slurry surfacings are identified in paving
instructions and explained in terms of scheduling for the job.
Range
slurry samples, emulsion samples, aggregate samples, binder
content, gradation, moisture content, contamination.
Outcome 2
Prepare to construct slurry surfacings.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28709 version 1
Page 3 of 4
Evidence requirements
2.1
Pre-construction checks are carried out and surface is swept in accordance with
company procedures.
Range
checks – day’s weather, rain radar, three day forecast,
temperatures, pre-seal repairs completed, construction signed off
ready for sweeping, start and finish locations.
2.2
Requirements for site safety, environmental protection, and temporary traffic
management are implemented in accordance with company procedures.
2.3
All objects and surfaces that need protection are either protected or marked and
recorded so they can be found and/or reinstated after paving in accordance with
company procedures.
Range
2.4
examples of objects needing protection – service covers, fire
hydrants, adjacent surfaces, roadmarking offsets.
Parties affected by site works are identified and notified in accordance with
contract requirements and company procedures.
Outcome 3
Construct slurry surfacings.
Range
evidence is required of working on three contracts covering each of the slurry
types – 1, 2, 3, 4, cape seal, rut fill.
Evidence requirements
3.1
Material deliveries and slurry machine management are monitored to optimise
plant, material, and labour use.
Range
3.2
Slurry application is monitored for quality and actions are taken to maintain
compliance with the slurry surfacing plan in accordance with company
procedures.
Range
3.3
aggregate type, source, and supply, emulsion, cool down,
additives, transport, labour, keeping materials dry, avoiding
segregation of mix.
monitor – controllers, consistency, layer thickness, screed, augers,
mixing box, longitudinal joints, transverse joints, build-up,
uncovered areas, hand work, edges, shoulders, intersections,
kerbs.
Hand work is managed in accordance with contract requirements.
Range
Infrastructure ITO
SSB Code 101813
edging, spreading, finishing areas that cannot be reached by the
slurry machine.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28709 version 1
Page 4 of 4
3.4
Traffic and site protection are monitored in accordance with the traffic
management plan and site safety plan.
3.5
Actions required in the event of uncertainty over technical requirements are
explained and followed in accordance with company procedures.
examples of uncertainty – mix seems different, site not ready for
laying, membrane seal not done, pre-seal repairs not completed.
Range
3.6
Weather conditions are monitored and consequent adjustments are made to the
work programme as required.
Planned review date
31 December 2019
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
19 February 2015
N/A
Consent and Moderation Requirements (CMR) reference
0101
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMRs). The
CMR 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 Infrastructure ITO qualifications@infrastructureito.org.nz if you wish to
suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016