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Water Safety Conference 2010. Richard Walker. Tips for Implementing Water Safety Plans. Water Corporation- Water Supply Profile. Main supplier of drinking water in Western Australia (WA) 2 million customers spread over 2 million km2 (~10 times the size of the United Kingdom).

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Water Safety

Conference 2010

Richard Walker

Tips for Implementing Water Safety Plans


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Water Corporation- Water Supply Profile

  • Main supplier of drinking water in Western Australia (WA)

  • 2 million customers spread over 2 million km2 (~10 times the size of the United Kingdom)

245 water distribution schemes in urban, rural

and remote communities

Raw water originates from a wide variety of sources

Surface water

Groundwater

Sea water

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Water Safety Plans (WSPs) – A Short History

  • 2004

  • Latest version of Australian Drinking Water Guidelines

  • Featured “Framework for Managing Drinking Water Quality”

  • Framework comprises 11 Elements

  • Water Corporation commenced preparation of WSPs

  • Vehicle to ensure meet the requirements of

  • Element 2 – Assessment of drinking water supply system

  • Element 3 – Preventive measures for drinking water quality management

  • Element 4 – Operational procedures & process controls

  • 2010

  • Completed 160/250 WSPs

  • Many have been revised several times

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Tips and Lessons

  • We want

    • Quality plans and

    • Quality implementation

  • Highly successful

    • -multiple revisions

    • -under pressure from operators to complete all WSPs

    • Spontaneous acclaim from operations

  • Lessons learnt

    • -WSP preparation and development

    • -systems to support WSP implementation

    • -senior management support & corporate governance

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Tips for Water Safety Plan Development

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Pathogens

Chemicals

Naegleria

WSP

Disinfection By Products

Pesticides

Prioritisation (How do I start?)

Aesthetics

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Pathogens

Chemicals

Naegleria

WSP

Disinfection By Products

Pesticides

Prioritisation (How do I start?) cont’d

Aesthetics

  • Which hazards do you want WSPs to help you manage?

  • The more you tackle

    • The longer it takes

    • The bigger the plan

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Pathogens

Chemicals

Naegleria

WSP

Disinfection By Products

Pesticides

Initial Water Corporation focus for WSPs

Nitrate

Compliance

Aesthetics

Judgement call based on

Understanding of water quality principles

Knowledge of systems and performance

Experience, especially attitudes of Health Department, Executive

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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WSP Teamwork

  • Team members are

  • Dedicated WSP planners (head office) plus

  • Actual operators of the scheme plus

  • Regional co-ordinator

  • Asset plans are often inaccurate/incomplete

  • Schemes cannot be operated as they were designed

  • An accurate schematic is essential for the WSP

  • Only the operator knows the TRUTH

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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WSP Teamwork

  • Planners must

  • Meet the operator on site (up to 4000km trip)

  • Plan well for that meeting

    • Draft schematic

    • Review of monitoring data

    • Draft hazard analysis

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Setting the water quality specification

  • Fundamental questions

  • What must I have?

  • What can I accept?

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Pragmatic Approach

Critical control points are non negotiable

Eg. Chlorinator set point must give Ct >15 for first customer for effective distribution

Process Control Points need to be practical

Eg. Chlorine residual at end of distribution should be >0.2mg/L to prevent regrowth, protection for backflow

But if this is not possible all of the time

Eg. Asset configuration, customer complaints, DBPs

Then you need to decide if <0.2 mg/L is OK?

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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What are you asking of an Operator?

Every out of spec monitoring result is a call for action.

If the operator can’t correct by operational change then

Use the action plan to highlight need for asset changes to allow Corporate Standards to be achieved

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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How frequently do I monitor?

CCPs – continuously

PCP - ? Utility to decide

Practices are likely to vary widely from site to site

Opportunity to standardise

Water Corporation applied – risk principles

- input from Operators with accountability for WQ outcomes

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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How frequently do I monitor?

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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How can WSPs be made useful for Operators?

  • The WSP is typically 10 – 30 pages

  • Too long for an operator

  • Water Corporation developed a “one page process control plan”

  • What an operator needs to do to deliver acceptable water quality

  • Process control plan contains

  • Schematic

  • Operating strategy

  • Process control table

    • Specification

    • Monitoring plan

    • Response to out of spec conditions

  • Sign off by responsible managers

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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  • The operating strategy for Bindoon-Chittering water supply involves:

  • Treatment for iron removal and pH correction is continuous and effective at all times (treated water outlet iron < 0.2 mg/L and pH between 6.5 and 8.5).

  • Ensuring continuous and effective disinfection (Ct > 15)

  • Maintaining chlorine residuals throughout the storages (> 0.5mg/L) and reticulation (> 0.3mg/L)

  • Process Control Table

Process Control Table

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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  • Operating Strategy involves:

  • The operating strategy for Bindoon-Chittering water supply involves:

  • Treatment for iron removal and pH correction is continuous and effective at all times (treated water outlet iron < 0.2 mg/L and pH

  • between 6.5 and 8.5).

  • Ensuring continuous and effective disinfection (Ct > 15)

  • Maintaining chlorine residuals throughout the storages (> 0.5mg/L) and reticulation (> 0.3mg/L)

Production (kL/day)

Note: Data from July 2003 to June 2007 for WRC Chittering Licence

Action Plan

Maintenance Improvements

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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  • Endorsement involves:

  • This process control table is endorsed for implementation.

  • The Midwest Region agrees to implement the operating strategy.

  • The Drinking Water Quality Branch agrees to provide corporate systems, processes and advice to assist the Midwest Region

  • with implementation.

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Tips for Systems to Support Water Safety Plan Implementation involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Target ranges – how can I remember them all? involves:

  • Sample point stickers with residual targets

  • Focusing on Chlorine residuals

  • Fast response

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Personal Data Acquisition involves:

Acceptable range is preprogrammed

Prompt to recheck if out of spec

Prompt for remedial action if out of spec confirmed

On line up date

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Email notification system – Out of spec involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Email notification system – Sample overdue involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Tips for Senior Management Support involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Senior Management Support involves:

  • How to move Corporate focus from

  • E coli in the reticulation to

  • Operational Performance

    • Source Protection

    • Filtration

    • Disinfection

    • Chlorine residuals ?

  • Make it easier for Managers to manage ………

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Governance Report involves:

  • The “Governance Report” provides an overview of key Drinking Water Quality management information in one report (Catchment to Tap)

  • Introduces a common and standard reporting approach on water quality throughout the state, which establishes due diligence and credibility

  • It shows a summary of compliance and operational reports with drill down capabilities for further detail

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Governance Report involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Water Safety Plan Performance Review & Reporting involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Water Safety Plan Performance Review & Reporting involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Water Safety Plan Performance Review & Reporting involves:

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Corporate Profile involves:

  • Corporate Water Quality Committee

  • Leadership/governance role eg.

    • WSP production target (30 pa)

    • Operational monitoring target (95%)

    • Critical limit performance (100%)

  • Feedback

    • Negative (please explain)

    • Positive (eg. 100% chlorine meters calibrated)

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Conclusion involves:

  • Successful WSP planning is a team effort

  • Central Branch provide

    • Vision

    • Understanding of WQ management principles

    • Pragmatic decision for local circumstances

  • Operators provide

    • Asset information and condition

    • Operating information

    • Monitoring service

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Conclusion cont’d involves:

  • Central Branch provide

    • Systems to help operators to implement SWPs

    • Management information

  • Senior Management

    • Review performance

    • Determine targets/expectations

    • Provide positive feedback

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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Conclusion cont’d involves:

  • Payback

    • Common focus for Corporation

    • Clear requirements for Operators

    • Reduced incidents

    • Higher confidence

Water Safety Conference

November 2-4 2010, Kuching, Malaysia


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