Sydney Water Operational Audit 2011/2 - IPART - NSW Government

Clause Requirement Grade
Reason
Audit Questions Evidence Cited Audit Observations
asset management
renewal/replacement strategy,
training and competency needs
for staff for inspection,
maintenance, testing and
operation and
renewal/replacement/new
specifications for tanks to meet
these criteria.
Site Inspection. 1 or 2
reservoirs.
A reservoir risk assessment workshop was held on 11 November 2011. The
workshops identified various modes of contaminant ingress into the reservoir
and discussions occurred on the most appropriate method to measure and
prioritise the risk of ingress.
Sydney Water inspected all existing reservoirs and finalised a remediation
timetable by 30 June 2012. An inspection checklist and work instruction was
prepared that included inspection criteria and critical limits that Sydney
Water used to inspect each reservoir. The inspections commenced 1
February 2012 and were completed on 30 April 2012. Operational input and
water quality data was used to prioritise the program of reservoir roof repairs
identified from the inspections.
Did SWC prepare and issue to
IPART by 31 March 2012 an
Audit Recommendations
Report that addressed the
recent audit recommendations
(2010-11) including address of
opportunities for
improvement?
For the period 1 July 2011 to 30 June 2012 Sydney Water managed drinking
water quality in accordance with the Australian Drinking Water Guidelines
and complied with this Operating Licence requirement.
12 of the 13 water delivery systems fully complied with the 2004 ADWG
health guideline values. The Nepean Delivery System did not comply against
the THM health guideline value.
A design Specification for a reservoir design was provided as an example of
the standard needed.
The aim of the Folio document is as internal document process to pull
together whole story annually. Assigns accountability to Clauses. Tracks
Progress specific to Clauses. Embedded with requirements and audit
recommendations. Updated twice per year.
Reservoir Roof Renewals Value Engineering Workshop, 24 May 2011
Established a “functional requirement for the reservoir roof renewal” which
would meet the stakeholders requirements, including optimised asset life,
ease of construction, minimise construction costs and improvements in water
quality performance.
A concept design review was conducted on 3 November 2011. Initiatives
included full roof span sheeting, minimising penetrations / hatches etc,
ensuring roof extended over reservoir walls, vermin proofing and improving
chlorine dosing ports.
A Water Quality workshop was also held on 28 October 2011 to ensure a
risk assessment process to protect water quality with reservoir design.
Existing controls were reviewed.
30 | GHD | Report for Independent Pricing and Regulatory Tribunal - Operational Audit of Sydney Water Corporation, 23/14602