Recycled Water Quality Management Plan - Margaret River Water Recycling

Recycled Water Quality

Management Plan

(RWQMP)

Margaret River

Water Recycling Scheme

Version No: 1

Date: 16/08/2010

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Recycled Water Quality Management Plan

This document has been prepared by Ascent Engineering on behalf of the Shire of Augusta

Margaret River. The information contained in this publication is intended for general use of

personnel involved in the Margaret River Water Recycling Scheme to assist in the implementation

and management of the recycling scheme.

Document History

Issue No

(version)

Original

prepared by

Issued to (description

/section revised)

Date Reviewed

by

Revision

Date

Approved

by

Approval

Date

V1 Ascent

Engineering

Department of Health &

AMRSC

Shire of Augusta

Margaret River

6 Sep 10

This table needs to reflect annual reviews and revisions

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Foreword

Include:

Purpose of the RWQMP

The Margaret River Water Recycling Scheme recycled water quality management plan

(RWQMP) is a stand-alone document to be used by all parties in the day to day operation and

management of the scheme. The purpose of this RWQMP is to document the assessment process

and to provide a record of the day to day operation and management of the scheme.

Scope of the RWQMP

This RWQMP provides an overview of how the 12 elements of the risk management framework of

the Australian Guidelines for Water Recycling Managing Health and Environmental Risk has been

addressed in the Margaret River Water Recycling Scheme.

This management plan is a live document in a process of continual development and review.

Structure of the document

Chapters 1 to 11 of this RWQMP provides the basic information of Margaret River Water

Recycling Scheme and the risk management requirements. Additional information is provided in

the Appendices.

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Contents

Foreword ................................................................................................................................................ 2

Contents .................................................................................................................................................. 3

1. Introduction .............................................................................................................................. 8

1.1 Site description ........................................................................................................................... 8

1.2 Existing environment .................................................................................................................. 9

1.3 Scheme overview ........................................................................................................................ 9

2. Recycled Water Quality Policy ...................................................................................................... 12

2.1 Policy document........................................................................................................................ 12

2.2 Regulatory and formal requirements ........................................................................................ 12

2.3 Stakeholder engagement ........................................................................................................... 12

3. Roles and Responsibilities .............................................................................................................. 13

3.1. Supplier .................................................................................................................................... 13

3.2 Scheme manager ....................................................................................................................... 13

3.3 Users ......................................................................................................................................... 13

3.4 Duty of care holder ................................................................................................................... 13

3.5 List of contact details ................................................................................................................ 13

4. Assessment of the Recycled Water Scheme .................................................................................. 15

4.1 Source water (influent) ............................................................................................................. 15

4.2 Water quality objectives ........................................................................................................... 15

4.3 Health risk assessment .............................................................................................................. 16

4.4 Recycled water storage ............................................................................................................. 17

4.4. Reticulation network (distribution system) and application (receiving environment(s) ......... 17

4.5 Systems operation ..................................................................................................................... 18

4.6 Prevention of cross connection with potable supplies .............................................................. 18

5. Treatment Train .............................................................................................................................. 19

5.1 Treatment description ............................................................................................................... 19

5.2 The HACCP .............................................................................................................................. 19

5.3 Operational monitoring and maintenance ................................................................................. 19

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5.4 System operators competency ................................................................................................... 21

5.5 Alarms, critical control points and critical limits ..................................................................... 21

5.6 Water supply arrangements ...................................................................................................... 22

6. Monitoring Plan............................................................................................................................... 23

6.1 Validation monitoring ............................................................................................................... 23

6.2 Operational monitoring ............................................................................................................. 23

6.1 Verification monitoring ............................................................................................................ 24

7. Employee Training & Public Education ....................................................................................... 25

7.1 Employee awareness and involvement ..................................................................................... 25

7.2 Employee training ..................................................................................................................... 25

7.3 Training records ........................................................................................................................ 25

7.4 Occupational health and safety procedures .............................................................................. 25

7.5 Public safety .............................................................................................................................. 25

8 Incident and Emergency Response ................................................................................................. 27

9 Community Involvement and Consultation ................................................................................... 28

9.1 Community consultation ........................................................................................................... 28

10 Documentation and Reporting ...................................................................................................... 29

10.1 Management of documentation and records ........................................................................... 29

10.2 Reporting ................................................................................................................................ 29

10.2.1 Internal .......................................................................................................................... 29 10.2.2 External ......................................................................................................................... 29

10.3 Annual report .......................................................................................................................... 29

11 Evaluation and Audit ..................................................................................................................... 30

References ............................................................................................................................................ 31

Glossary ................................................................................................................................................ 32

Appendices ........................................................................................................................................... 35

Appendix A: Scheme Location ........................................................................................................... 36

Appendix B: Drawing of the Recycled Water Scheme from Source to End-use(s) ...................... 44

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Appendix C: Water Balance& Cost Benefit Analysis Report ......................................................... 46

Appendix D: Treatment Plant Process Flow Diagram .................................................................... 47

Appendix E: Health Risk Assessment ............................................................................................... 48

Appendix F: Validation and Verification Report ............................................................................ 49

1. Introduction ................................................................................................................................. 49

2. Sampling methodology ............................................................................................................... 49

3. Results ......................................................................................................................................... 50

4. Operational/online data ............................................................................................................... 50

5. Influent flow ............................................................................................................................... 51

6. Discussion ................................................................................................................................... 51

8. Copy of original results............................................................................................................... 51

Appendix G: OHS Procedures and Material Safety Data Sheets ................................................... 52

Appendix H: Sampling Plan ............................................................................................................... 53

Appendix I: Warning Signs ................................................................................................................ 54

Appendix J: Training/ Education ...................................................................................................... 55

Refer to Operations & Maintenance Manual training information. Appendix K: Annual Report ... 55

Appendix K: Annual Report .............................................................................................................. 56

1. Introduction ................................................................................................................................. 57

2. Quality of recycled water ............................................................................................................ 57

2.1 Recycled water quality sampling ....................................................................................... 57 2.2 Analysis of results .............................................................................................................. 58

3. Emergency and Incident Management ........................................................................................ 58

4. Complaints .................................................................................................................................. 59

5. Audit ........................................................................................................................................... 59

Appendix P: Recycled Water Supply Agreement ............................................................................ 61

Appendix Q: Hazard Analysis and Critical Control Points ............................................................ 62

Appendix R: Operational and Maintenance Manual of the WWTP ............................................. 63

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Appendix S: Shire Operations and Maintenance Manual .............................................................. 64

Appendix T: System information for Forrest Rd Shire Filters and UV System ........................... 65

Appendix U: Land Capability Assessment ....................................................................................... 66

Appendix V: Irrigation Volumes Margaret River Turf Site ........................................................... 67

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Tables

Table 1. Margaret River Rainfall .................................................................................................................... 9

Table 2. Summary of the Margaret River Water Recycling scheme (whole scheme) ................................. 11

Table 3 Water quality objectives of the recycled water as agreed by Water Corporation ............................ 15

Table 4 Typical Average Water Quality as Measured by Water Corporation .............................................. 16

Table 5. Estimated Annual Recycled Use ..................................................................................................... 22

Figures

Figure 1. Riverslea Subdivision, Margaret River ........................................................................................... 8

Figure 2. Water Corporation's Storage Dam ................................................................................................. 10

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1. Introduction

The Shire of Augusta-Margaret River local government authority has to constructed a recycled

water system to enable treated waste water from the Water Corporation’s Margaret River Waste

Water Treatment Plant to be used for irrigating public open space including parks, high school and

primary school ovals, central sporting facilities and golf course. The project will reduce extraction

of water from the Margaret River by approximately 169 megalitres per annum, contributing to

increased environmental flows and improved water quality. It will provide a sustainable water

source for recreation areas in the Margaret River town site as it grows in line with population

increases.

It is intended to extend the system to the Riverslea subdivision to irrigate its public open spaces

and to provide a construction water supply source at the Forrest Road (nearTingle Ave) tank site.

1.1 Site description

The location is the Riverslea subdivision, Margaret River (see Appendix A).

Figure 1. Riverslea Subdivision, Margaret River

1

7

2

4

3

5

6

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1.2 Existing environment

Climate - Margaret River has a Mediterranean-style climate with hot dry summers and wet

moderately cold winters. Rainfall is as shown in the table below.

Table 1. Margaret River Rainfall

Source: http://www.mronline.com.au/weather/weatherview.htm (16/08/2010)

Land use vegetation – Margaret River is a townsite, surrounded by national park to the

north and rural agricultural land to the south, east and west.

Topography and flooding – Margaret River town has an elevation of about 100m AHD. It

is located in a moderately hilly area. Which plateaus on the south side of the town roughly

aligning the edge of the plateau along Wallcliffe Road and Forrest Road.

The receival tank of the recycled water at Forrest Road, which will service Riverslea is at

the top of the subdivision, which slopes generally down to the east.

Proximity to water sources and water table – The Margaret River borders the northern side

of town. Darch Brook is a tributary to the Margaret River, running south to north on the

eastern side of the town. Most of town drains into the Margaret River.

The water table is generally below 2m, though in some locations the water table is perched

on a high clay level, which can lead to high water tables.

Sensitive receiving environments – The Margaret River and the Darch Brook are

considered sensitive receiving environments.

Refer to Appendix C – “Water Balance & Cost Benefit Analysis Report”

1.3 Scheme overview

Source water – This is the Margaret River Wastewater Treatment Facility, owned and

operated by the Water Corporation.

Location of the treatment apparatus – about 2km north of Margaret River Town. Refer to

Appendix B.

http://www.mronline.com.au/weather/weatherview.htm

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Location and capacity of storage apparatus/ponds – The Water Corporation’s storage dam

is about 350ML.

Figure 2. Water Corporation's Storage Dam

The storage capacity of the receiving tank at Riverslea is 200kL.

Treatment apparatus – The Water Corporation has tertiary treatment of the sewerage it

receives, including screening, oxygenation, settling, filtering and chlorination.

Existing infrastructure – All the infrastructure is in place, except for the final disinfection

system at the Forrest Road tank. Connection of the existing reticulation in the various

parks in Riverslea has not been carried out, pending system approval.

Refer to Appendix B for system schematic.

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Table 2. Summary of the Margaret River Water Recycling scheme (whole scheme)

Scheme Characteristic Description

Location Margaret River

Source of recycled water Margaret River Wastewater Treatment Facility

Volumes of recycled water to be produced 181ML for parks, 19ML for Standpipes

Proposed end uses of the recycled water Irrigation of MR public open space and Primary

School and High School MR Golf Club

(approved) and now Riverslea Subdivision and

Construction Standpipes

Percentage of recycled water used in each one of

the proposed end uses

It is intended that all of the irrigation water in

each location be 100% recycled water.

Type of treatment system SBR Sequence Bach Reactor, storage dam,

coarse sand filtration at MR wastewater

treatment facility. Further filtration and UV

disinfection for Riverslea and standpipes.

Location of the WWTP 2km north of Margaret River

Expected flow per day Minimum 0 kL

Average 548kL

Maximum 1,800kL

Estimated number of people that will benefit/use

the recycled water scheme

About 6,000

Irrigation area (m2) 72.5ha

Risk exposure level Moderate

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2. Recycled Water Quality Policy

2.1 Policy document

The Shire formally endorsed the Water Recycling scheme at its ordinary meeting of Council on 12

March 2008.

2.2 Regulatory and formal requirements

1. Department of Water - Supplier’s Licence Exemption

2. Department of Health – O&MP, Water Sampling Plan, Emergency Response Plan

3. Water Corporation

a. Agreement

b. Design

4. Department of Environment and Conservation

a. Approval to Use Land

b. Bed & Bank Disturbance

c. Native Vegetation Clearing Permit

d. Works Approval

e. Disposal Licence

5. Aboriginal Heritage – S18 approval

All of the above approvals have been processed except for the Department of Health approval

relating to Riverslea and Rapids Landing subdivisions. Department of Health approval has been

granted for the scheme (Approval No. EHB-00956) except for Riverslea and Rapids Landing.

This management plan will be submitted to WA Health for review, as part of the conditions of

approval for the Margaret River Water recycling scheme.

2.3 Stakeholder engagement

Stakeholders include –

Riverslea Residents – adjacent to the recycled water. Require information and education about

safe water application.

Water Corporation – recycled water supplier, must supply agreed amount and to agreed water

quality.

Shire of Augusta Margaret River – scheme owner, manager and operator.

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3. Roles and Responsibilities

3.1. Supplier

The supplier is the Water Corporation with tertiary treatment of the wastewater.

Refer to Appendix P: Recycled Water Supply Agreement Water Corporation and the Shire of

Augusta Margaret River.

3.2 Scheme manager

The scheme manager is the Shire of Augusta Margaret River. The shire has undertaken the design,

approvals, construction ownership operation and maintenance of the system.

3.3 Users

The users are the residents of Riverslea and the Lester Group construction contractor and the Shire

of Augusta Margaret River construction operators.

Refer to the communications plan for education of the residents. Further notification to the

residents will be undertaken once all approvals are in place

3.4 Duty of care holder

Provide the contact details for the personnel whom have the duty of care to provide safe recycled

water for the intended purposes.

The Duty of Care Holder for the Recycled Water Scheme is:

Shire of Augusta Margaret River

Townview Terrace Margaret River WA 6285

The contact person for the Margaret River Recycled Water Scheme is

Name of person: _Wayne Gailey__________________________

Position: _Manager Works________________________

Phone number on (08): _9780 5641__________________________

3.5 List of contact details

Name Position Phone

Shane Bacskai Parks and Gardens

Supervisor

9780 5640

Allan Miller (Water

Corporation)

Supervising Wastewater

Operator

0429 910 648

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Refer to Appendix S: Shire Operations and Maintenance Plan

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4. Assessment of the Recycled Water Scheme

4.1 Source water (influent)

Water source – Water Corporation wastewater treatment facility. The typical sewerage values of

8000 rotavirus, 2000 Cryptosporidium, and 7000 Campylobacter per litre were used (National

Guidelines Nov 06, Section 3.5.2) for this project and are based on the 95th percentiles used for

determining health-targets.

4.2 Water quality objectives

Chemicals are not generally considered to be a human health risk where wastewater is derived

predominantly from domestic catchments, and recycled water is used for non-drinking purposes.

Industrial recycling schemes or other schemes in which chemical inputs from the catchments are

considered to be significant, require the identification of specific chemical water quality objectives

through risk assessment.

Recycled water quality after the treatment by the Water Corporation is as follows.

Table 3 Water quality objectives of the recycled water as agreed by Water Corporation

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Table 4 Typical Average Water Quality as Measured by Water Corporation

Parameter Units Value

E Coli cfu/100 mL 870

Thermotolerant

Coliforms

cfu/100 mL 226

BOD mg/L 5.1

SS mg/L 14.7

TN mg/L 4.0

TP mg/L 0.4

Conductivity mS/cm 98

Further treatment will be carried out at the Forrest Road water tank to improve the water quality to -

< 10 E.coli org/100 mL

Turbidity < 2 NTU

< 20 mg/L BOD

<30 mg/L SS

pH 6 – 9

4.3 Health risk assessment

Health risk assessment is used to identify the most serious threats of recycled water based on

likelihood of occurrence and severity of consequences. Health risk assessment evaluates the

hazards and events that can compromise recycled water quality and safety.

Microbial quality

The typical sewerage values of 8000 rotavirus, 2000 Cryptosporidium, and 7000 Campylobacter

per litre were used (National Guidelines Nov 06, Section 3.5.2) for this project and are based on

the 95th percentiles used for determining health-targets.

Microbial hazards for human health include enteric viruses, protozoa and bacteria. The total log

reduction required for the Riverslea scheme is 5 log reduction of viruses, 3.5 log reduction of

protozoa and 4 log reduction of bacteria (see National Guidelines Nov 06, Tables 3.7 and 3.8).

This allows an unrestricted recycled watering regime for the recycled water.

An inbuilt safety margin will be applied with watering carried out at night and the use of

withholding periods.

For the Construction Stand-pipe the following applies –

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The total log reduction required for the proposed Construction Stand pipe 5.5 log reduction of

viruses, 4 log reduction of protozoa and 5 log reduction of bacteria. Calculations for the exposure

and required log reductions have been made as per the National Guidelines Nov 06, Appendix 2.

Theses calculations are attached as Appendix V: Risk Assessment

Chemical quality

Exposure of chemicals in recycled water is too low to represent a health risk.

Summary of Preventive measures

In the first instance the Water Corporation's treatment, storage and disinfection of the water

provides 3 log removal of viruses and protozoa and 4 log removal of bacteria.

For the Riverslea Parks and for the construction water tank stand further filtration and disinfection

of the water will occur to further prevent the potential for public exposure to enteric protozoa,

viruses and bacteria. Night time irrigation and withholding periods will also be used for the

parks. Management protocols will be put in place for the use of the recycled water for the

construction stand pipe.

In total the combined Treatment and On-site based Preventative Measures will provide adequate

log removals.

Detailed HRA is presented in Appendix E: Health Risk Assessment.

4.4 Recycled water storage

Details and capacity of storage tank – 200kL steel tank with full cover and locking manhole

lid.

Security (accessibility to public) – the tank is fully fenced with recycled water signage around

the perimeter

Turnover time – within 1 day, with up to 2 days on non-irrigation days.

Properly sealed? (accessibility to animals/insects) – the tank is fully enclosed

Maintenance – an inspection and maintenance regime has been put in place for the tank and

surrounds as per the Operations and Maintenance Plan, Appendix S.

Structure soundness (Australian Standards compliance) – yes.

Refer to Appendix B: Drawings of the Recycled Water Scheme from Source to End-uses;

Appendix D: Treatment Plant Process Flow Diagram, and Appendix S: Operations and

Maintenance Plan

4.4. Reticulation network (distribution system) and application (receiving

environment(s)

Refer to Appendix A: Scheme Location; Appendix B: Drawing of the Recycled Water Scheme

from Source to End-uses(s); Appendix D: Treatment Plant Process Flow Diagram

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4.5 Systems operation

A trunk main pipe delivers water from the MR wastewater treatment facility under pump pressure

(about 700 kPa) from Water Corporation pumpset. The water is delivered to the tank at Forrest

Road, where it undergoes further filtering and disinfection. From the tank the water is pumped

into the existing reticulation system in the Riverslea parks. It is also pumped to the adjacent stand

pipe for delivery on demand. The system is pressure driven with variable speed pumps to cater for

differing water demands.

4.6 Prevention of cross connection with potable supplies

Minimizing the risk of cross contamination is done by:

1. avoiding the potable water service corridor allocation in road reserves;

2. use of purple trunk pipe mains;

3. purple coloured valve boxes;

4. recycled water signage on the system and through the parks;

5. no connections designed, and therefore no need for backflow protection, to scheme water.

Refer to Appendix E: Health Risk Assessment, Appendix Q: Hazard Analysis and Critical Control

Points and Appendix S: Operations and Maintenance Manual

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5. Treatment Train

5.1 Treatment description

Water will be received from the Water Corporation to agreed standard as already approved

by the Department of Health.

Water in the Forrest Road tank will be filtered using disposable filters down to 10 micron

on the supply side of the tank.

Water will then be filtered and then disinfected by UV light using an automated system

with continual monitoring.

A testing regime will be put in place on commencement for three months to monitor the

efficacy of the system to remove contaminants from source water.

Manual testing and direct manual chlorination dosing will occur in the event of treatment

system failure. This system is approved for the other sites and has proven effective.

Refer to Appendix D: Treatment Plant Process Flow Diagrams; Appendix S: Operations and

Maintenance Manual

5.2 The HACCP

A preventive risk management system such as Hazard Analysis and Critical Control Point (HACCP) has

been used for assessing risks and managing risk. The purpose of the HACCP is to identify all hazards in

the treatment process that could cause the final product to be out of specification, such that it could cause

illness or injury.

The construction stand pipe hazard assessment is based on the information provided by Workplace Health

and Safety Queensland, July 2007 at the site

http://www.deir.qld.gov.au/workplace/resources/pdfs/model_watermgt.pdf

Refer to Appendix E: Health Risk Assessment; Appendix Q: Hazard Analysis and Critical Control

Points

5.3 Operational monitoring and maintenance

Details on the operational monitoring and maintenance of all the major apparatus within the

recycled water system are as follows:

Water Corporation has full operational, monitoring and maintenance plans for their system;

Operations, monitoring and maintenance manual and checklists in place for Shire system;

http://www.deir.qld.gov.au/workplace/resources/pdfs/model_watermgt.pdf

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UV disinfection and monitoring apparatus for Forrest Rd tank system to be supplied with

operating instructions and procedures to be developed based on operating and maintenance

requirements;

Management and operational structure has been detailed in the Manual, Shane Bakskai is in

charge of the system; and

Operational monitoring and maintenance frequencies.

1. Storage Tank

a. Carry out fortnightly inspection to – i. Check that the tank and connections are not leaking ii. Check that valves are operating correctly and are not leaking iii. Ensure that all signage is displayed correctly iv. Ensure that fencing, tank covers, manhole hatches are in good working

order v. Ensure all locks are working vi. Check that the float switch is working and free of debris

b. Carry out monthly inspection on – i. The SCADA overflow alarm ii. The SCADA components

c. Carry out an annual inspection on – i. The tank interior during scheduled maintenance.

d. Non-scheduled Maintenance to be fixed immediately – i. Fix tank and/or connections ii. Fix valves iii. Display, clean, repair, signage iv. Fix fencing, tanks covers, manhole hatches v. Replace broken locks vi. Fix or replace float switch and clear of debris vii. Fix SCADA as required

e. Scheduled Maintenance – i. At the end of the irrigation season partially fill with non-recycled water

(enough to cycle through each station for sprinkler maintenance) and then

clean the inside as required. Do not empty the tank below a depth of

600mm, as this amount of water is needed to keep the tank structure

stable. ii. Lubricate locks annually prior to autumn rains

2. Reticulation System

a. Carry out fortnightly inspections using non-recycled water to check that – i. the sprinklers are working, are acting uniformly, to the correct length and

appropriate direction ii. there are no leaks at the pump station iii. the Pump Station Shed is secure and the lock is in good order iv. the pump is in good working order v. the automation system is working when in the manual mode vi. that no sodden areas of lawn or garden develop

b. Carry out annual inspections on the electrical system by a qualified electrician

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c. Non-scheduled Maintenance to be fixed immediately – i. Raise, clean and re-direct sprinklers ii. Repair pipes iii. Fix leaks at the Pump station iv. Fix the pump v. Fix the automatic system faults vi. Fix electrical faults vii. Map sodden area and schedule for repair immediately.

d. Scheduled Maintenance – i. Service the pump at the manufacturer’s recommended service interval.

Refer to maintenance manuals in the Appendix B. ii. Service the automation system at the manufacturer’s recommended

service interval. iii. Service the reticulation sprinklers. At the same time as the annual end of

season service of the storage tank, using clean water service the sprinklers.

iv. Repair sodden areas – hollow tyne cored and sand to remove thatch and allow water penetration into soil profile, or dud out and replaced with clean sand and fresh turf.

Refer to Appendix Q: Hazard Analysis and Critical Control Points

5.4 System operators competency

Staff operating the system are the Parks and Gardens staff at the Shire of Augusta, who are

competent reticulation systems operators.

Staff have undergone specific formal sampling and occupational health & safety training for the

use of the recycled water system and have operated the system for one season.

Further training will be provided on the specific filtration and disinfection equipment used at the

Forrest Road tank site when the instructions are provided.

Construction staff are to be fully trained for use of the stand pipe, the water tanker and the spraying

operations.

5.5 Alarms, critical control points and critical limits

Identified critical control points (CCPs) are at:

Treatment - Filtration

Disinfection - Water Corporation chlorination and Shire filter and UV system

Irrigation

Standpipe

Tankering

Construction spraying

Critical limits and corrective actions are identified in the Operations and Maintenance Manual

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The operation of shutdown systems will be fully tested at commissioning and the outcome of these

tests recorded.

Real-time monitoring will be linked to Treatment (Water Corporation), Disinfection (Water

Corporation) and the filter and UV system (Shire).

Refer to Appendix Q: Hazard Analysis and Critical Control Points and Appendix S: Operations

and Maintenance Manual

5.6 Water supply arrangements

The Water Corporation supplies water to the Shire of Augusta Margaret River for this scheme.

Refer to the table below for details of water to be supplied.

Table 5. Estimated Annual Recycled Use

Refer to agreement in Appendix P: Recycled Water Supply Agreement

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6. Monitoring Plan

Monitoring will be undertaken as a two phase approach based following:

6.1 Validation monitoring

Validation is a critical component of treatment process management because it ensures that the

required water quality objectives will be achieved.

From the Draft Guidelines for the Use of Recycled Water in WA Table 6.1 the following

Validation and Verification monitoring is to be undertaken.

Validation monitoring will be undertaken during commissioning of the treatment plant in

accordance with the Guidelines for the Use of Recycled Water in WA (2010). Before the scheme

is approved, a validation and verification report of the treatment system needs to be reviewed by

WA Health.

Refer to Appendix F: Validation and Verification Report.

6.2 Operational monitoring

Operational monitoring refers to the parameters monitored at each CCP to demonstrate the

treatment plant is operating correctly. Each operational parameter has critical limits and alert limits

that are established during the validation monitoring. Corrective actions that need to be taken if a

critical limit is breached need to be included.

The procedures for operational monitoring should include:

What is being monitored

How the monitoring is done

When the monitoring is done

Where the monitoring is done

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Who is responsible for ensuring it is completed

The critical limits, alert levels an corrective actions


Operational Monitoring is to be undertaken.

Detail information is included in Appendix Q: Hazard Analysis and Critical Control Points

6.1 Verification monitoring

Verification monitoring assesses the overall performance of the system and compliance with the

overall water quality objectives. It is independent of the routine operational monitoring of the

system and it is used to confirm product water quality objectives.

Testing need to be conducted by a laboratory that is National Association of Testing Authorities

(NATA) accredited laboratory.

Refer to section 6.1 above for the verification monitoring.

For details refer to Appendix F: Validation and Verification Report and Appendix H: Sampling

Plan.

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7. Employee Training & Public Education

7.1 Employee awareness and involvement

Employees including plant operators and contractors have a sound knowledge base from which to

make effective operational decisions. They are trained in the methods and skills required to

perform their tasks efficiently and competently. Employees need to be aware of the potential

consequences of system failures, and of how their decisions can affect the safety of the scheme.

7.2 Employee training

Shire Parks and Gardens Maintenance staff are all trained for basic operation of reticulation

irrigation. Specific induction training for the handover of the recycled water system occurred with

training on the Operations and Maintenance Manual.

Sampling training was provided by the Shire’s Health Manager on the correct procedure for

sampling for key Maintenance staff.

A select staff member has been sent to a Water Corporation accredited sampling course.

When the Riverslea system and standpipe system approvals are in place specific systems training

will be undertaken for these items for all staff, with a requirements for signoff as per the

Operations and Maintenance Manual.

7.3 Training records

Training records are kept in the Operations and Maintenance Manual and all involved staff are

trained and required to sign off on the training before using recycled water.

Refer to Appendix J: Training and Education

7.4 Occupational health and safety procedures

Occupational health and safety procedures are documented in the Operations and Maintenance Manual.

Refer to Appendix G: OHS Procedures

7.5 Public safety

Provide copies of the information to be given to recycled water users to promote awareness of

recycled water quality issues, allowable uses, responsibilities and the impacts of unauthorised uses.

Meetings have been held with sporting groups and the Department of Health information provided

for the users of the sporting fields.

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Signage is in place and will be extended to Riverslea parks, to the standpipe and to the water

tanker and the construction site where recycled water is used.

A letter will be sent to residents near the Riverslea parks with educational material, safety

information, what to do in case of a mishap information and contact information.

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8 Incident and Emergency Response

The recycling scheme should include all possible incidences that will affect the water quality or

any aspect of the recycled scheme.

The incident and Emergency Responses are documented in the Operations and Maintenance Plan,

including communications and response protocols.

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9 Community Involvement and Consultation

9.1 Community consultation

Community consultation plan is provided in the Hazard Analysis of Critical Control Points and

Communications Plan.

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10 Documentation and Reporting

10.1 Management of documentation and records

The Shire has records keeping processes for all documentation it receives. This includes

information from the public, incident management, and the keeping of sampling and monitoring

information, reporting of information, training and compliance records.

The Operations and Maintenance Manual is the live document which is updated as required. This

document updates contacts, provides operating protocols, maintenance protocols, emergency

response protocols. It is the vehicle where continual improvement activities are documented.

Records for training, safe operating procedures and job safety analysis is recorded in this

document.

10.2 Reporting

10.2.1 Internal

10.2.1.1 Incident report

All employees and contractors should record the initial incident information including:

Date, time, location and nature of the incident.

Persons injured, equipment damaged or environment impacted.

Nature of injury or damage and estimate of severity.

Immediate corrective action being taken.

Assistance required.

Activity in progress at the time.

10.2.2 External

10.3 Annual report

The scheme needs to submit the annual report by 30 September each year to WA Health. The

report corresponds to the immediately preceding financial year and contains the detailed

information in Appendix K: Annual Report.

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11 Evaluation and Audit

Continual Improvement is a responsibility of the system manager and the activities required to be

undertaken and frequency are provided in the Operations and Maintenance Manual. Audit

activities are also included and results shall be made available to WA Health on request.

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References

WA Health (2010) Guidelines for the use of Recycled Water in Western Australia.

NRMMC, EPHC and AHMC (Natural Resource Management Ministerial Council, Environment

Protection and Heritage Council and Australian Health Ministers’ Conference) (2006) Australian

Guidelines for Water Recycling: Managing Health and Environmental Risks (Phase 1) Canberra.

enHealth Council (2004) Environmental Health Risk Assessment: Guidelines forassessing human

health risk from environmental hazards, Department of Health and Ageing and enHealth Council,

Canberra

Australian and New Zealand Standard AS/NZS 3500:2003, Plumbing and Drainage

Australian and New Zealand Standard AS/NZS ISO 31000:2009 Risk Management – Principles

and Guidelines

WA Health (2006) Mosquitoes and Cyclones; Managing the Risk of Mosquito‐ Borne Disease

Guidelines 2006

Queensland Government, Natural Resources and Water (2008) Recycled water management plan

and validation guidelines.

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Glossary

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Term/Abbreviation Definition/Description

Activated Sludge An activated mass of micro-organisms capable of stabilising waste aerobically – a

“biomass”.

AGWR (2006) Australian Guidelines for Water Recycling: Managing Health and Environmental Risk

(Phase 1)

Alert limit Is the early warning that process is becoming unstable. May indicate the possibility of

exceeding a regulatory requirement or a critical limit for a CCP

AS/NZS Australian Standards/New Zealand Standards

BOD Biological oxygen demand

CCP Critical control point. CCPs are activities, procedures or processes where a control can

be applied and that is essential for preventing, eliminating or managing a hazard to an

acceptable level.

cfu Coliform forming units

COD Chemical oxygen demand

Commissioning

verification

A validation monitoring conducted to prove that the expected water quality is being

constantly produced by the commissioned treatment plant

Critical limit A prescribed tolerance that must be met to ensure that a critical control point effectively

controls a potential health hazard; a criterion that separated acceptability from

unacceptability.

Ct The production of disinfectant concentration (C in mg/L) and contact time (t in minutes),

used in disinfection

DO Dissolved oxygen

E Coli Escherichia coli. The most common thermotolerant coliform present in faeces and used

as indicator of faecal contamination

Exceedance Water quality that goes outside identified limits. This limits may include alert levels,

critical limits or water quality objectives

g gram

GL gigalitre

HACCP Hazard analysis and critical control points

Hazard A biological, chemical, physical or radiological agent that has the potential to cause

harm

Hazardous event An incident or situation that can lead to the presence of a hazard, or often directly

contains a hazard

kL Kilolitre

L Litre

Log reduction Used in reference to the physical-chemical treatment of water to remove, kill or

inactivate microorganisms such as bacteria, protozoa and viruses (1-log removal = 90%

reduction in density of the target organism, 2-log removal = 99% reduction, 3-log

removal = 99.9% reduction, etc).

MBR Membrane bioreactor

mg/L Milligrams per litre

ML Megalitre

MoU Memorandum of understanding

NATA National Association of Testing Authorities

NTU Nephelometric turbidity unit

Operational The routine monitoring of control parameters that confirm the treatment process are

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monitoring under control and operating within the operating criteria

PCT Process control table

PLC Programmable logic controller

Point of supply The physical point of transfer to the user

PPE Personal protective equipment

Public open space Any open space, such as parks, sporting fields, racecourses, school ovals, municipal

parks and gardens, golf courses, footpaths, car parks, road verges, where either members

of the public, staff or employees may be exposed to recycled water. It does not include

gardens in domestic residences nor agricultural farmland

QA/QC Quality assurance/quality control

Recycled water

provider

An entity that owns infrastructure for the production and supply of recycled water

Residual risk The risk remaining after consideration of existing preventive measures

Risk The likelihood of a hazard causing harm in exposed populations in a specified time

frame, including the magnitude of that harm.

RWQMP Recycled water quality management plan

SBR Sequential batch reactor

SCADA Supervisory control and data acquisition

Scheme Refers to a recycled water scheme

Sewage Household and commercial wastewater that contains or may contain faecal, urinary or

any other human waste

Sewerage A sewer, access chamber, vent, engine, pump, structure, machinery, outfall or other

work used to receive, store, transport or treat sewage

Sludge The constituents removed from wastewater treatment plants include screenings, grit,

scum and sludge. Sludge is usually in the form of a liquid or semisolid liquid that

typically contains from 0.25 to 12% solids by weight.

SS Suspended solids

Target limit Refers to the normal operational value(or value range) for a process which indicates that

the process is stable

TN Total nitrogen

TP Total phosphorous

Treatment Validation A documented program about how the plant or equipment used for the treatment of

recycled water are to be tested to demonstrate the quality f the recycled water

consistency meets the water quality objectives for the intended end use. Treatment

validation includes the operational criteria to ensure capability to effectively control

hazards

TSS Total suspended solids

UV Ultraviolet

Violation limit Critical limit is the operational value or performance criteria (that has been violated)

which separates acceptable from unacceptable in terms of hazard control and recycled

water safety. Corrective actions need to be implemented immediately to regain process

control

WWTP wastewater treatment plant

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Appendices

Appendix A: Scheme Location

Appendix B: Drawing of the Recycled Water Scheme from Source to End-use(s)

Appendix C: Water Balance

Appendix D: Treatment Plant Process Flow Diagram

Appendix E: Health Risk Assessment

Appendix F: Validation and Verification Report

Appendix G: OHS Procedures and Material Safety Data Sheets

Appendix H: Sampling Program

Appendix I: Warning Signs

Appendix J: Training and Education

Appendix K: Annual Report

Appendices L to O not listed

Appendix P: Recycled Water Supply Agreement

Appendix Q: Hazard Analysis and Critical Control Points

Appendix R: Operational and Maintenance Manual of the WWTP

Appendix S: Operations and Maintenance Manual of the Shire

Appendix T: System Information for Forrest Rd Shire Filters and UV System

Appendix U: Land Capability Assessment

Appendix V: Risk Assessment

Appendix W: Nutrient Irrigation Management Plan

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Appendix A: Scheme Location

RIVERSLEA

RAPIDS LANDING

GLOUCESTER

HIGH SCHOOL

PRIM. SCHOOL

PARK

REUTHER PARK

GOLF CLUB

TREATMENT PLANT

WASTE WATER

0 1000m 2000m

MARGARET RIVER WATER RECYCLING PROJECT

Location map – Riverslea on left middle

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Site Map - Riverslea

1

7

2

4

3

5

6

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Park 1 Aerial – Cnr. Shilton Place & Forrest Road

Forrest Rd Tank, Pump, Controller Panel, Fencing

Fence

Water Tank

Standpipe

Sign

Boundary

LEGEND

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Park 2 Aerial – The Greenway

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Parks 3 & 4 Aerial – The Avenue & Butterfly Park

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Park 5 – (Horseshoe Park)

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Park 6 – Yellow Gum Wk

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Park 7 – Farmhouse Place

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Appendix B: Drawing of the Recycled Water

Scheme from Source to End-use(s)

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Standpipe

Future

Parks &

Tank

Approved

Approved

Riverslea

Approved

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Appendix C: Water Balance& Cost Benefit

Analysis Report

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Appendix D: Treatment Plant Process Flow

Diagram

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Appendix E: Health Risk Assessment

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Appendix F: Validation and Verification Report

1. Introduction

This report documents the testing of the microbiological removal and the effluent water quality of

the Margaret River Water Recycling scheme.

The treatment plant comprises the following processes:

List

Water Corporation

i. Primary,

ii. Secondary

iii. Storage

iv. Filtration &

v. Chlorination

Shire – Forrest Road

i. Bag Filtration

ii. UV Disinfection

2. Sampling methodology


Validation and Verification monitoring is to be undertaken.

The sampling location(s)

Water Corporation –

1. Final Effluent

2. Storage Dam Outflow

3. Post Chlorination

Shire

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1. Post UV Filtration 2 samples / week for ecoli

Quality assurance/Quality control (QA/QC)

1. As per Operations and Maintenance Manual for monitoring, reporting

and audit.

3. Results

To be included when system is commissioned.

A summary of test results for the commissioning verification

A summary of any water quality exceedences (if they occur), the circumstances that led to

them occurring and any corrective/preventive actions taken or put in place

A statistical analysis of the data collected to determine the confidence level for meeting the

water quality objectives on a continuous basis.

Table 1 Summary of test results

Date Report

No

Lab Parameter Units Effluent

Compliance value

Sampling

Point

Result Comments

4. Operational/online data

Table 2 Summary of operational data results

Date Parameter Units Sampling

Point

Result (Daily average)

Water Corporation has continuous monitoring of chlorine dosing and flow.

Shire will has contiunual monitoring of flow and UV intensity and hours.

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5. Influent flow

Influent is guaranteed water quality as per Water Corporation Agreement to <1000 Ecoli /100ml.

6. Discussion

The Deparment of Envioronment has waived the requirement for a wastewater disposal works

approval and licence. They have assessed the application for the Riverslea subdivision and the

disposal regime and deemed that a licence is not required.

Turbidity - UV intensity monitoring will supersede turbidity monitoring for UV system.

Provided adequate intensity is achieved and the maximum flow rate is not exceeded, the

required log reductions will be achieved. UV intensity supercedes turbidity monitoring for UV

system.

7. Conclusions

The quality of water achievable through the Water Corporation’s treatment process as well as the

Shire’s upgrade of water quality will

8. Copy of original results

To be included once monitoring commences.

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Appendix G: OHS Procedures and Material

Safety Data Sheets

As per Operations and Maintenance Manual.

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Appendix H: Sampling Plan

As per Operations and Maintenance Manual.

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Appendix I: Warning Signs

Refer to Appendix A for signs locations.

Refer to Operations & Maintenance Manual for Department of Health information.

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Appendix J: Training/ Education

Refer to Operations & Maintenance Manual training information.

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Appendix K: Annual Report

Define the financial year of the report (e.g. 2010 – 2011). Include more than one of each one of the tables

below if more than one WWTP or different end-uses apply for the recycling scheme.

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1. Introduction

Include an overview of the project and complete the table below

Table 1 Summary of the Margaret River Water Recycling scheme

Name of Scheme Margaret River Water Recycling

Approval Number EHB-00956 + ????? (Riverslea & Standpipes)

Date of Approval 12 June 2009

Local Government Shire of Augusta Margaret River

Address of Scheme Owner PO Box 61, Margaret River

Scheme Information Description

Location Margaret River

Source of recycled water Water Corporation Wastewater Treatment Facility

Volumes of recycled water produced per year 181ML for parks, 19 for Standpipes

End uses of the recycled water Irrigation of MR public open space and Primary School

and High School MR Golf Club (approved) and now

Riverslea Subdivision and Construction Standpipes

Percentage of recycled water used in each

one of the proposed end uses Parks and ovals = 90.5%

Construction Standpipe = 9.5%

Type of treatment system SBR Sequence Bach Reactor, storage dam, coarse sand

filtration at MR wastewater treatment facility. Further

filtration and UV disinfection for Riverslea and

standpipes

Location of the WWTP 2km north of Margaret River

Minimum, average and maximum flows per

day Minimum Flow = 0kL

Average = 548 kL / day over year

Maximum = 1,800 kL / day

Peak inflow of the plant -

Number of people using the recycled water About 6,000

Irrigation area in m2 725,000 + construction areas

Risk exposure level Moderate

2. Quality of recycled water

2.1 Recycled water quality sampling

Include:

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Locations and dates of recycled water quality sampling

A tabulated presentation of laboratory recycled water quality test results.

An assessment of recycled water quality compliance with the Guidelines for the use of

Recycled Water in WA values

Table 2 Summary of laboratory recycled water quality results

Location

(site

code)

Parameter Units Frequency of

sampling (e.g

weekly, monthly)

Total No of

samples

Min Max Mean Median Complying

(Yes/No)

2.2 Analysis of results

Include:

Performance comparison against guidelines

Comparison against previous years data

3. Emergency and Incident Management

A summary of events and issues that affected recycled water quality and/or caused a non-

compliance with the guideline values. Include details of corrective actions/response procedures.

Include:

Power failure

Mechanical failure

Excess wastewater produced (sewerage overflow)

Effluent quality failure

Chemical spills

Major infrastructure failure or disruption

Failure in the recycling pipework or end uses of the recycled water

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Major Infrastructure Works Carried Out

Include days of the year the WWTP was no operational and the reasons for that

4. Complaints

Include a summary of public/staff complaints regarding recycled water quality.

All complaints records shall be registered immediately with the following details:

Name, contact, location and general nature of complaint;

Proposed steps to investigate complainants requests made;

Method of notification by complainant;

Regulatory authority notified (if applicable);

Table 3 Summary of complaints relating to recycled water Quality

Type/nature of the complaint Location Actions to

investigate/correct

Notification to DoH

(if applicable)

(e.g. odour/suspected illness/

ponding)

5. Audit

Include details of proposed improvements to the recycling scheme based on internal/external audit

that will strengthen the scheme’s ability to supply safe recycled water for the intended end-use(s)

Table F.4 Response to audit report

Auditor/ reviewer

comment (System

deficiency and non-

compliances)

Scheme

response

Corrective

actions to

prevent

reoccurrence

Timetable for

corrective/preventive

action

Person(s)

responsible

Completion

Date

(e.g. odour/suspected

illness/ ponding)

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The report must be signed by the chief executive officer or general manager of the water

authority.

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Appendix P: Recycled Water Supply Agreement

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Appendix Q: Hazard Analysis and Critical

Control Points

Operational monitoring is the routine, often continuous (on-line), monitoring of Critical Control

Points and Process Control Points in the WWTP to ensure compliance within the defined

operational criteria. It is used to determine if each preventative measure is effectively controlling

hazards, and provides an advance warning if treatment barriers are moving away from a stable

operational state.

CCP require operational parameters that can be measured and for which critical limits can be set to

define the operational effectiveness of the activity. The operational parameters need to be

monitored sufficiently frequently to reveal any failures in a timely manner. CCP also have process

for corrective actions that can be implemented in response to deviations from critical limits and

alert levels. Alert levels are more conservative than critical limits and represent an early warning

so that corrective actions can be implemented before a critical limit is exceeded.

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Appendix R: Operational and Maintenance

Manual of the WWTP

Not Applicable - Water Corporation WWTP

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Appendix S: Shire Operations and Maintenance

Manual

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Appendix T: System information for Forrest Rd

Shire Filters and UV System

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Appendix U: Land Capability Assessment

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Appendix V: Irrigation Volumes Margaret River

Turf Sites