NZQA registered unit standard
22111 version 3
Page 1 of 3
Title
Demonstrate knowledge of sewer cleaning, blockage removal,
overflow management and clean-up
Level
3
Credits
Purpose
3
People credited with this unit standard are able to demonstrate
knowledge of: sewer cleaning; sewer blockage removal; and
sewer overflow management and clean-up procedures.
This unit standard is for people who supervise maintenance
and operations in water reticulation, and people who work in
specialist water reticulation activities.
Classification
Water Industry > Water Reticulation
Available grade
Achieved
Explanatory notes
1
Legislation includes but is not limited to – Health Act 1956, Local Government Acts
1974 and 2002, and Resource Management Act 1991.
2
Definition
Water reticulation – in this context refers to all pipe systems, pumping systems, and
components that contribute to the collection and disposal of wastewater and
stormwater.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of sewer cleaning.
Evidence requirements
1.1
Sewer cleaning is described in terms of the reasons for cleaning for specified
situations.
Range
1.2
maintain capacity, prevent overflows, prevent odours.
Sewer cleaning is described in terms of the techniques used for specified
situations.
Range
hydrojetting, root cutting, ‘pigging’, dragging or skipping, pressure
bucket.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
22111 version 3
Page 2 of 3
Outcome 2
Demonstrate knowledge of sewer blockage removal.
Evidence requirements
2.1
Blockage removal is described in terms of the techniques used for specified
situations.
Range
vacuum suction, rodding, water jetting, root cutting, root killing,
excavation.
Outcome 3
Demonstrate knowledge of sewer overflow management and clean-up procedures.
Evidence requirements
3.1
Overflow is described in terms of the potential causes, and the factors
contributing to these causes.
Range
3.2
inflow, infiltration, exfiltration, sewer blockage, partial blockage, fat
or roots reducing capacity, pipe or plant failure.
Overflow is described in terms of the potential effects on the environment and
public health.
Range
environmental – aquatic life, odours, aesthetics;
public health – bacterial contamination, disease.
3.3
Overflow is described in terms of the requirements for resource consents.
3.4
Flow management is described in terms of the methods to mitigate the effects
of overflows.
Range
3.5
includes but is not limited to – pump shut-down and storage,
bypass pumping, tankering, containment options.
The procedures for disposal of contaminated debris from overflows or material
removed during sewer cleaning are described in accordance with legislative
requirements and environmental implications.
Range
Planned review date
public health protection, designated or approved tip sites.
31 December 2016
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
22111 version 3
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
26 October 2005
31 December 2016
Rollover
2
20 February 2009
31 December 2016
Rollover
3
21 July 2011
N/A
Consent and Moderation Requirements (CMR) reference
0179
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 Primary Industry Training Organisation standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016