DRINKING WATER QUALITY MANAGEMENT PLAN 2017/2018 … · The Gympie Regional Council 2017/18...

DRINKING WATER QUALITY MANAGEMENT PLAN

2017/2018 REPORT

Water Service Provider No. SP485

Drinking Water Quality Management Report 2017/18 Page i

About this report The Gympie Regional Council 2017/18 Drinking Water Quality Management Plan Report provides an overview of our operational performance with respect to drinking water quality, and shows how we have been implementing key improvement actions detailed in our approved Drinking Water Quality Management Plan (DWQMP).

This report provides our customers with information about the quality of their drinking water.

This report informs the regulator on how we complied with our DWQMP and its approval conditions. It also allows us to meet our legislative obligations under the Water Supply (Safety and Reliability) Act 2008.

Readership

This report aims to communicate comprehensive information to satisfy the needs of individuals and groups who are affected by, or have an interest in, our activities, including:

• our customers; • the communities we serve; • current and future employees; • government agencies; • other Local Council’s and utilities; and • business and industry.

Reporting requirements

Under the Water Supply (Safety & Reliability) Act 2008, water providers must prepare a DWQMP Report each financial year. The report must include:

• The actions taken by Gympie Regional Council to implement our DWQMP;

• The outcome of any DWQMP Review undertaken;

• A summary of DWQMP audit findings and recommendations (if an audit was undertaken);

• Details of any water quality incidents;

• Details of Gympie Regional Council’s compliance with drinking water quality criteria; and

• Details of any customer complaints related to water quality.

Drinking Water Quality Management Report 2017/18 Page ii

Tell us what you think

If you would like to provide feedback on this report, please contact us via:

Website

www.gympie.qld.gov.au

Head office

2 Caledonia Hill Gympie QLD 4570 (Monday to Friday 8.30am – 4.30pm)

Phone

1300 307 800 (8.30am to 4.30pm weekdays)

Email

[email protected]

mailto:[email protected]

Drinking Water Quality Management Report 2017/18 Page 1 of 75

TABLE OF CONTENTS Chapter 1: About us ................................................................................. 2

What we do .......................................................................................................................................................................................... 2

Our strategic framework...................................................................................................................................................................... 2

Chapter 2: Our service area .................................................................... 4

Chapter 3: Drinking water quality performance ................................... 7

Legislative requirements ..................................................................................................................................................................... 7

Water quality performance summary................................................................................................................................................. 7

Chapter 4: Notifying the regulator ......................................................... 9

Chapter 5: Managing water safety ........................................................ 10

Chapter 6: Managing the customer's water quality experience ........ 12

Appendices.............................................................................................. 13

Appendix A: Water quality compliance – E. coli ............................................................................................................................... 14

Appendix B: Water quality compliance – Health Assessment ......................................................................................................... 23

GLOSSARY ............................................................................................. 56

Progress against the risk management improvement program in the approved DWQMP ................................................................................ 58


Chapter 1: About us

What we do

Gympie Regional Council is responsible for delivering drinking water, recycled water and sewerage services to approximately 31,919 customers in the Gympie Region.

Our 6,898km2 geographical area is made up of Gympie, Goomeri, Kilkivan, Imbil, Kandanga, Amamoor, Rainbow Beach, Cooloola Coast, Tin Can Bay.

We provide our services through the management of an extensive water and sewerage network, including:

• 865km of pipeline; • 6 water pump stations & boosters; • 74 sewage pump stations; • 21 water reservoirs; • 7 sewage treatment plants, and • 8 water treatment plants.

Our strategic framework

Our purpose

To be the natural choice to live, work and play by being a sustainable regional water business.


Our Corporate Values

Key Strategic Themes

Council’s activities aimed toward achieving its vision for the future of the local government area are focused into the following five key strategic themes.


Chapter 2: Our service area

Our network

We supply around 3,697.4 megalitres of drinking water to approximately 14,206 residential and commercial properties. Drinking water is delivered to our customers via 8 separate network water supply schemes:

1. Gympie 2. Amamoor 3. Kandanga 4. Imbil 5. Kilkivan 6. Goomeri 7. Cooloola Cove/Tin Can Bay 8. Rainbow Beach.

The schemes begin at raw water source (surface and bore) and include water treatment, water storage, trunk and distribution pipe networks, pumps, chlorination systems and water meters. Gympie is the largest scheme, supplying 64% of the customers.


Gympie

The Mary River is the sole source of supply for the Gympie scheme, and Gympie Regional Council holds a high priority allocation of 3454ML per annum from this source. SEQWater control releases from Borumba Dam which feeds into the Mary River via Yabba Creek.

This scheme includes:

• shared bulk water sources and infrastructure; • water treatment; • chlorine disinfection and fluoridation; • operation and management, and • water distribution.

Mary Valley

Imbil sources its water from Yabba Creek which is fed from Borumba Dam. This scheme includes:

• surface water source and infrastructure; • water treatment; • chlorine disinfection and UV treatment; • operation and management, and • water distribution.

Kandanga sources its water from Kandanga Creek. This scheme includes:

• surface water source and infrastructure; • water treatment; • chlorine disinfection; • operation and management, and • water distribution.

Amamoor sources its water from Amamoor Creek. This scheme includes:

• surface water source and infrastructure; • water treatment; • chlorine disinfection; • operation and management, and • water distribution.


Western

Goomeri sources its water from a combination of artesian bores and an off stream storage off Kimbombi Creek. Kilkivan sources its water from artesian bores.

These schemes include:

• bores, surface water source and infrastructure; • water treatment; • chlorine disinfection and ozone treatment; • operation and management, and • water distribution.

Coastal

Rainbow Beach water is sourced from bores drawing sub artesian water from the Cooloola Sand mass and Cooloola Cove and Tin Can Bay source water from Teewah Creek.

The Rainbow Beach scheme includes:

• bores and infrastructure; • water treatment; • chlorine disinfection; • operation and management, and • water distribution.

The Cooloola Cove and Tin Can Bay schemes includes:

• surface water source and infrastructure; • water treatment; • chlorine disinfection and fluoridation; • operation and management, and • water distribution.


Chapter 3: Drinking water quality performance

Legislative requirements

The supply of safe and reliable drinking water in Queensland is regulated by various state legislation, including the Water Supply (Safety and Reliability) Act 2008, and the Public Health Act 2005.

Under the Water Supply (Safety and Reliability) Act 2008, a drinking water service provider may only carry out a registered drinking water service in accordance with an approved Drinking Water Quality Management Plan (DWQMP).

Under the Public Health Act 2005, Queensland Health has regulated the standards for drinking water quality related to E. coli and fluoride. These standards, together with the health guideline levels in the Australian Drinking Water Guidelines 2011 (ADWG), have been incorporated under the Water Supply (Safety and Reliability) Act 2008 as water quality criteria for drinking water in Queensland.

Water quality performance summary

For 2017/18, Gympie Regional Council met the prescribed health-related standards for all eight drinking water schemes.

Table 1 summarises how our drinking water schemes performed over 1 July 2017 to 30 June 2018, against each category of water quality performance:

Water Quality Performance Scheme Microbiological Chemical

Gympie

Amamoor

Imbil

Kandanga

Goomeri

Kilkivan

Rainbow Beach

Cooloola Cove / Tin Can Bay

Table 1: Drinking water performance summary: 1 July 2017 – 30 June 2018


Verification monitoring program

To verify that we deliver safe drinking water, Council’s Environmental Health Department collects samples from the respective networks and sends the samples to a NATA accredited laboratory for water analyses from 29 dedicated sample points across our service region, analysing ADWG water quality parameters annually. The water quality data is reviewed and compared against prescribed requirements in the legislation and the ADWG.

As part of our commitment to continuous improvement we revising the location of the sample points in the network and installing new sample taps with dedicated service lines.

Microbiological assessment (E. coli)

We achieved excellent health performance over 2017/18 with 100% of drinking water schemes complying with legislative E. coli requirements.

The standard for drinking water in Queensland requires no detection of E. coli in 98% of samples collected over a 12 month period. The minimum number of samples required to be taken is detailed in the Queensland Public Health Regulation 2005 Schedule 3A.

E. coli water quality compliance details are provided in Appendix A, including the month-by-month performance.

Health-related chemical assessment

All 8 drinking water schemes complied with the health-related chemical limit values defined in the ADWG.

We use a risk management approach to drinking water quality which allows us to identify the substances that may pose a risk to public health. The verification monitoring program analyses these substances which are continuously assessed against ADWG health-related limits and operational control triggers. All our drinking water schemes comply with the health-related limits described in the ADWG using the 95th percentile (95th-%ile) calculation.

Health assessment water quality compliance details are provided in Appendix B.

Aesthetic assessment

Our routine verification monitoring program is important for us to verify we provide safe drinking water to our customers. We take advantage of the program to continuously assess non-health related parameters which contribute to the way our water tastes, smells and appears. We aim to meet the ADWG aesthetic guidelines where possible, however providing safe drinking water is our overriding priority.


Chapter 4: Notifying the regulator Under sections 102 and 102A of the Water Supply (Safety and Reliability) Act 2008, Gympie Regional Council is required to immediately inform the Regulator if the quality of water supplied from the drinking water service does not comply with the water quality criteria as specified in the ADWG.

In the event that Gympie Regional Council becomes aware of a reportable incident, we notify the Regulator within the required timeframe. For the occurrence of THM exceedances in the Mary Valley, initial notification was made on 19 March 2018, Part A form was submitted on 20 March 2018. An external audit has demonstrated that Gympie Regional Council has since provided regular updates and monitoring results to the regulator.

On detection of a water quality issue, Council immediately initiate further sampling in the affected zone, undertake a comprehensive investigation to determine the factors that may have attributed to the event, and initiate responsive corrective actions e.g. flushing of water mains. All actions are implemented to ensure the continued supply of safe, clean drinking water.


Chapter 5: Managing water safety Gympie Regional Council is committed to providing safe, reliable drinking water from source to the customer's tap. We ensure a consistent and reliable supply of high quality safe drinking water to our customers.

Drinking Water Quality Management Plan review

Gympie Regional Council operates with an approved DWQMP.

In March 2017, Council undertook a comprehensive review of the existing DWQMP and conducted full risk assessments of all schemes in August 2017. As a result of the review, a DWQMP amendment was submitted to the Regulator for approval in September 2017 and subsequently approved in May 2018.

In view of the amendment Council requested a deferral of our November 2017 audit date to ensure that newly implemented processes and improvements were captured by the audit. The Regulator agreed to defer the audit to November 2018.

Risk management approach

The DWQMP approved 4 May 2018 follows industry best practice in that all water quality hazards have been identified, risk assessed, and where necessary, improvements have been committed to.

Some of our key future improvement areas are outlined below.

New Water Treatment Plants – Mary Valley

Following on from the successful commissioning of the new Imbil Water Treatment Plant (WTP) in 2017, new WTPs for Amamoor and Kandanga have been constructed and are expected to be commissioned in early 2019. These new plants utilise enhanced treatment processes such as ultraviolet disinfection along with standard industry best practice filtration and chlorination steps.

Construction of these plants highlight Gympie Regional Council’s commitment to providing the highest quality of water to Mary Valley residents for years to come.

Online water quality monitoring

Gympie Regional Council have commenced a multi-year project to increase and expand the “online” monitoring of water quality across the eight WTPs. Raw water and Treated water online monitoring instrumentation is currently being implemented in all Water Treatment


Plants throughout the 2017/18 and 2018/19 Capital Programs. While some of the plants already have a level of online monitoring, this project will ensure that every plant follows industry best practice into the future, with the implementation of automation and online control.

DWQMP Audit

Viridis Consultants Pty Ltd conducted the inaugural audit of Gympie Regional Council’s approved DWQMP on 24 - 26 October 2018. The audit included site inspections of the raw water intakes, the bore site, water treatment plants, reservoirs and interviews with WBU staff.

The scope of the audit was in accordance with the Drinking Water Quality Management Plan Review and Audit Guidelines 2013.

As required by the Water Supply (Safety and Reliability) Act 2008 (the Act), Gympie Regional Council is operating its drinking water service under an approved DWQMP. This summary includes the findings and conclusions from the first audit of the Gympie Regional Council DWQMP.

Viridis spent three days in the Gympie Regional Council local government area to audit the DWQMP. The audit included inspections of three schemes (Gympie, Imbil and Kilkivan) and Borumba Dam, interviews with relevant staff and stakeholders and review of documentation and records.

Gympie Regional Council demonstrated a very high level of compliance with their DWQMP Audit and it was evident that the implementation of the DWQMP is embedded into the day to day operations of Council’s water services. The two minor non-compliances were due to historical errors and there are new processes in place to prevent these from reoccurring.

Recommendations have been provided for the minor non-compliances. Opportunities for improvement have also been identified, where relevant.

The two recommendations from the audit are as follows:

• Establish robust review processes to ensure data provided in the annual report is accurate.

• Implement processes to ensure all sampling is undertaken in accordance with the DWQMP.


Chapter 6: Managing the customer's water quality experience Gympie Regional Council receives various water quality enquiries throughout the year. When a customer is dissatisfied with the efforts of Gympie Regional Council to address a water quality issue and remedial action is required, these enquiries are classified as 'water quality complaints'. These water quality complaints are captured, recorded and monitored to help identify any trends and possible areas of improvement in the operation, maintenance and management of the Gympie Regional Council network.

In 2017/18, Gympie Regional Council received 21 water quality complaints. These complaints included concerns about water taste, odour, discoloration, illness and the appearance of cloudy water. These concerns were across 4 of our water schemes. Gympie Regional Council embarked on a mains cleaning program which has resulted in a reduction of water quality complaints in the Western supply schemes.


Appendices


Appendix A: Water quality compliance – E. coli

Overall

Scheme Number of samples required

Actual number of samples

Number of samples E.coli

detected

Required performance

%

Actual performance

%

E. coli Compliant

Amamoor 24 24 0 98 100

Cooloola Cove/Tin Can Bay 108 108 0 98 100

Goomeri 24 24 0 98 100

Gympie 124 1231 0 98 100

Imbil 24 24 0 98 100

Kandanga 24 25 0 98 100

Kilkivan 24 24 0 98 100

Rainbow Beach 96 952 0 98 100

1 Sampling missed at Memorial Park, Gympie - EHO could not access sample due to sample tap being in construction area. Advised to use an alternative tap in the park.

2 Sampling missed at Laurie Hanson Park, Rainbow Beach – EHO advised that tap had been removed with demolition of public toilet block. EHO requested to use of the tap adjacent to the new BBQ and playground facilities.


Drinking water scheme: Amamoor

Year 2017-18

Month July Aug Sep Oct Nov Dec Jan Feb Mar Apr May June No. of samples collected 2 2 2 2 2 2 2 2 2 2 2 2 No. of samples collected in which E. coli is detected (i.e. a failure) 0 0 0 0 0 0 0 0 0 0 0 0 No. of samples collected in previous 12 month period 24 24 24 24 24 24 24 24 24 24 24 24 No. of failures for previous 12 month period 0 0 0 0 0 0 0 0 0 0 0 0 % of samples that comply 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% Compliance with 98% annual value YES YES YES YES YES YES YES YES YES YES YES YES

CALCULATE PERCENTAGE USING A TWELVE (12) MONTH 'ROLLING' ANNUAL VALUE

The Public Health Regulation 2005 (the regulation) requires that 98 per cent of samples taken in a 12 month period should contain no E. Coli. This requirement is referred to as the 'annual value' in Schedule 3A of the regulation.

This requirement comes into effect once you have 12 months data and should be assessed every month based on the previous 12 months data (so that it is a 'rolling' assessment).


Drinking water scheme: Cooloola Cove/Tin Can Bay

Year 2017-2018


CALCULATE PERCENTAGE USING A TWELVE (12) MONTH 'ROLLING' ANNUAL VALUE The Public Health Regulation 2005 (the regulation) requires that 98 per cent of samples taken in a 12 month period should contain no E. Coli. This requirement is referred to as the 'annual value' in Schedule 3A of the regulation. This requirement comes into effect once you have 12 months data and should be assessed every month based on the previous 12 months data (so that it is a 'rolling' assessment).


Drinking water scheme: Gympie

Year 2017-2018

Month July Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun No. of samples collected 11 10 10 11 10 10 10 10 10 11 10 10 No. of samples collected in which E. coli is detected (i.e. a failure) 0 0 0 0 0 0 0 0 0 0 0 0 No. of samples collected in previous 12 month period 114 114 114 115 115 116 122 121 122 123 123 123 No. of failures for previous 12 month period 0 0 0 0 0 0 0 0 0 0 0 0 % of samples that comply 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% Compliance with 98% annual value YES YES YES YES YES YES YES YES YES YES YES YES



Drinking water scheme: Goomeri Year 2017-18

Month July Aug Sept Oct Nov Dec Jan Feb Mar Apr May June

No. of samples collected 2 2 2 2 2 2 2 2 2 2 2 2 No. of samples collected in which E. coli is detected (i.e. a failure) 0 0 0 0 0 0 0 0 0 0 0 0 No. of samples collected in previous 12 month period 24 24 24 24 24 24 24 24 24 24 24 24 No. of failures for previous 12 month period 0 0 0 0 0 0 0 0 0 0 0 0

% of samples that comply 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% Compliance with 98% annual value YES YES YES YES YES YES YES YES YES YES YES YES



Drinking water scheme: Imbil Year 2017-18

Month July Aug Sep Oct Nov Dec Jan Feb Mar Apr May June No. of samples collected 2 2 2 2 2 2 2 2 2 2 2 2

No. of samples collected in which E. coli is detected (i.e. a

failure) 0 0 0 0 0 0 0 0 0 0 0 0 No. of samples collected in previous 12 month period 24 24 24 24 24 24 24 24 24 24 24 24 No. of failures for previous 12 month period 0 0 0 0 0 0 0 0 0 0 0 0 % of samples that comply 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% Compliance with 98% annual value YES YES YES YES YES YES YES YES YES YES YES YES



Drinking water scheme: Kandanga

Year 2017-18

Month July Aug Sep Oct Nov Dec Jan Feb Mar Apr May June No. of samples collected 2 2 2 2 2 2 2 2 2 2 2 2

No. of samples collected in which E. coli is detected (i.e. a failure) 0 0 0 0 0 0 0 0 0 0 0 0 No. of samples collected in previous 12 month period 24 24 24 24 24 24 24 24 24 24 24 24 No. of failures for previous 12 month period 0 0 0 0 0 0 0 0 0 0 0 0 % of samples that comply 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% Compliance with 98% annual value YES YES YES YES YES YES YES YES YES YES YES YES



Drinking water scheme: Kilkivan Year 2017-18




Drinking water scheme: Rainbow Beach

Year 2017-18

Month July Aug Sept Oct Nov Dec Jan Feb Mar Apr May June No. of samples collected 8 8 8 7 8 8 8 8 8 8 8 8 No. of samples collected in which E. coli is detected (i.e. a failure) 0 0 0 0 0 0 0 0 0 0 0 0 No. of samples collected in previous 12 month period 94 94 94 93 93 94 94 94 95 95 95 95 No. of failures for previous 12 month period 0 0 0 0 0 0 0 0 0 0 0 0 % of samples that comply 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% Compliance with 98% annual value YES YES YES YES YES YES YES YES YES YES YES YES



Appendix B: Water quality compliance – Health Assessment


Table - Amamoor Water Analysis

Parameter

Units Frequency

of sampling

Total No. samples collected

No of samples in

which parameter

was detected

No. of samples

exceeding water quality criteria

Min Max Average (Mean)

Limit of reporting

Laboratory name

Chlorine Residual Raw mg/L - - - - - - - - - Treated W 365 365 0 1.4 5.0 3.1 WTP

Reticulation M 24 24 0 0.04 1.91 1.02 QFSS Total

Trihalomethanes Raw ug/L - - - - - - - - -

Treated - - - - - - - - - Reticulation M 12 12 4 100 340 209 QFSS

E. Coli Raw mpn/100mL - - - - - - - - - Treated - - - - - - - - -

Reticulation M 24 0 0 0 0 0 QFSS pH Raw HY 1 1 0 7.85 7.85 7.85 QFSS

Treated W 53 53 0 7.89 7.89 7.89 WTP Reticulation HY 1 1 0 7.94 7.94 7.94 QFSS

Total Hardness Raw mgCaCO3/L HY 1 1 0 187 187 187 QFSS Treated M 22 22 0 82 214 169 WTP

Reticulation HY 1 1 0 188 188 188 QFSS Temporary Hardness Raw mgCaCO3/L HY 1 1 0 160 160 160 QFSS

Treated HY 1 1 0 162 162 162 QFSS Reticulation HY 1 1 0 164 164 164 QFSS

Alkalinity Raw mgCaCO3/L HY 1 1 0 160 160 160 QFSS Treated HY 1 1 0 162 162 162 QFSS

Reticulation HY 1 1 0 164 164 164 QFSS Residual Alkalinity Raw meq/L HY 1 0 0 0.0 0.0 0.0 QFSS

Treated HY 1 0 0 0.0 0.0 0.0 QFSS Reticulation HY 1 0 0 0.0 0.0 0.0 QFSS

Silica Raw mg/L HY 1 1 0 24 24 24 QFSS Treated HY 1 1 0 24 24 24 QFSS

Reticulation HY- 1 1 0 24 24 24 QFSS Total Dissolved Ions Raw mg/L HY 1 1 0 367 367 367 QFSS


Total Dissolved Solids

Raw mg/L HY 1 1 0 292 292 292 QFSS Treated HY 1 1 0 298 298 298 QFSS


Reticulation HY 1 1 0 300 300 300 QFSS True Colour Raw Hazen HY 1 1 0 8.0 8.0 8.0 QFSS


Turbidity Raw NTU HY 1 1 0 2.0 2.0 2.0 QFSS Treated W 53 53 0 0.070 0.250 0.138 WTP

Reticulation HY 1 1 0 1.0 1.0 1.0 QFSS pH Saturation Raw HY 1 1 0 7.9 7.9 7.9 QFSS


Saturation Index Raw HY 1 0 0 0.0 0.0 0.0 QFSS Treated HY 1 0 0 0.0 0.0 0.0 QFSS

Reticulation HY 1 1 0 0.1 0.1 0.1 QFSS Mole Ratio Raw HY 1 1 0 2.1 2.1 2.1 QFSS


Sodium Raw mg/L HY 1 1 0 35 35 35 QFSS Treated HY 1 1 0 38 38 38 QFSS

Reticulation HY 1 1 0 38 38 38 QFSS Potassium Raw mg/L HY 1 1 0 0.9 0.9 0.9 QFSS


Calcium Raw mg/L HY 1 1 0 25 25 25 QFSS Treated HY 1 1 0 24 24 24 QFSS

Reticulation HY 1 1 0 25 25 25 QFSS Magnesium Raw mg/L HY 1 1 0 31 31 31 QFSS


Hydrogen Raw mg/L HY 1 0 0 0.0 0.0 0.0 QFSS Treated HY 1 0 0 0.0 0.0 0.0 QFSS

Reticulation HY 1 0 0 0.0 0.0 0.0 QFSS Bicarbonate Raw mg/L HY 1 1 0 194 194 194 QFSS


Carbonate Raw mg/L HY 1 1 0 0.8 0.8 0.8 QFSS Treated HY 1 1 0 0.9 0.9 0.9 QFSS

Reticulation HY 1 1 0 1.1 1.1 1.1 QFSS Hydroxide Raw mg/L HY 1 0 0 0.0 0.0 0.0 QFSS



Chloride Raw mg/L HY 1 1 0 67 67 67 QFSS Treated HY 1 1 0 70 70 70 QFSS

Reticulation HY 1 1 0 70 70 70 QFSS Fluoride Raw mg/L HY 1 1 0 0.09 0.09 0.09 QFSS


Nitrate Raw mg/L HY 1 1 0 0.5 0.5 0.5 QFSS Treated HY 1 1 0 0.5 0.5 0.5 QFSS

Reticulation HY 1 1 0 0.5 0.5 0.5 QFSS Sulphate Raw mg/L HY 1 1 0 13 13 13 QFSS


Iron Raw mg/L HY 1 1 0 0.01 0.01 0.01 QFSS Treated M 22 22 0 0.003 0.035 0.012 WTP

Reticulation HY 1 1 0 0.01 0.01 0.01 QFSS Manganese Raw mg/L HY 1 1 0 0.01 0.01 0.01 QFSS

Treated M 19 19 0 0.001 0.014 0.006 WTP Reticulation HY 1 1 0 0.01 0.01 0.01 QFSS

Zinc Raw mg/L HY 1 1 0 0.01 0.01 0.01 QFSS Treated HY 1 1 0 0.01 0.01 0.01 QFSS

Reticulation HY 1 1 0 0.02 0.02 0.02 QFSS Aluminium Raw mg/L HY 1 1 0 0.05 0.05 0.05 QFSS


Boron Raw mg/L HY 1 1 0 0.04 0.04 0.04 QFSS Treated HY 1 1 0 0.04 0.04 0.04 QFSS

Reticulation HY 1 1 0 0.04 0.04 0.04 QFSS Copper Raw mg/L HY 1 1 0 0.03 0.03 0.03 QFSS


Annual Aluminium Metals

Raw mg/L HY 1 1 0 0.042 0.042 0.042 QFSS Treated HY 1 1 0 0.140 0.140 0.140 QFSS

Reticulation HY 1 1 0 0.070 0.070 0.070 QFSS Annual Arsenic

Metals Raw mg/L HY 1 1 0 0.0007 0.0007 0.0007 QFSS



Annual Cadmium Metals

Raw mg/L HY 1 1 0 0.0001 0.0001 0.0001 QFSS Treated - 1 1 0 0.0001 0.0001 0.0001 QFSS

Reticulation HY 1 1 0 0.0001 0.0001 0.0001 QFSS Annual Chromium



Annual Copper Metals


Reticulation HY 1 1 0 0.009 0.009 0.009 QFSS Annual Iron Metals Raw mg/L HY 1 1 0 0.14 0.14 0.14 QFSS


Annual Lead Metals Raw mg/L HY 1 1 0 0.0001 0.0001 0.0001 QFSS Treated HY 1 1 0 0.0007 0.0007 0.0007 QFSS

Reticulation HY 1 1 0 0.0003 0.0003 0.0003 QFSS Annual Manganese



Annual Nickel Metals Raw mg/L HY 1 1 0 0.0025 0.0025 0.0025 QFSS Treated HY 1 1 0 0.0007 0.0007 0.0007 QFSS

Reticulation HY 1 1 0 0.0006 0.0006 0.0006 QFSS Annual Zinc Metals Raw mg/L HY 1 1 0 0.004 0.004 0.004 QFSS



Table 2 - Goomeri Water Analysis

Parameter

Scheme

Units Frequency

of sampling


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory

name








Total Hardness Raw mgCaCO3/L HY 4 4 0 239 605 487 QFSS Treated M 26 26 0 260.0 492.0 351.0 WTP



Alkalinity Raw mgCaCO3/L HY 4 4 0 155 373 306 QFSS Treated M 26 26 0 92.0 296.0 203.54 WTP

Reticulation HY 1 1 0 282.0 282.0 282.0 QFSS Residual Alkalinity Raw meq/L HY 4 0 0 0 0 0 QFSS



Reticulation HY 1 1 0 30 30 30 QFSS Total Dissolved Ions Raw mg/L HY 4 4 0 526 1050 884 QFSS










Saturation Index Raw HY 4 4 0 0.4 0.9 0.7 QFSS Treated HY 1 1 0 0.9 0.9 0.9 QFSS








Treated M 27 27 0 0.001 0.019 0.003 WTP Reticulation HY 1 1 0 45 45 45 QFSS












Reticulation HY 1 1 0 2.0 2.0 2.0 QFSS Sulphate Raw mg/L HY 4 4 0 8.0 43.0 32.5 QFSS

















Table 3 - Gympie Water Analysis

Parameter

Scheme

Units Frequency

of sampling


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory name

Chlorine Residual Raw mg/L - - - - - - - - - Treated D 365 365 0 2.5 4.6 3.3 WTP

Reticulation W 121 121 0 0.04 2.86 1.18 QFSS Total



E. Coli Raw mpn/100mL - - - - - - - - - Treated M 12 0 0 0.0 0.0 0.0 QFSS

Reticulation M 111 0 0 0.0 0.0 0.0 QFSS pH Raw HY 1 1 0 7.3 7.3 7.3 QFSS

Treated D 365 365 0 7.00 7.50 7.22 WTP Reticulation HY 2 2 0 7.18 7.19 7.19 QFSS














Treated D 365 365 0 1.0 2.0 1.0 WTP Reticulation HY 2 2 0 1.0 1.0 1.0 QFSS

Turbidity Raw NTU HY 1 1 0 3.0 3.0 3.0 WTP Treated D 365 365 0 0.07 0.17 0.10 WTP



Saturation Index Raw HY 1 1 0 -1.10 -1.10 -1.10 QFSS Treated HY 1 1 0 -1.40 -1.40 -1.40 QFSS

Reticulation HY 2 2 0 -1.40 -1.30 -1.35 QFSS Mole Ratio Raw HY 1 1 0 2.9 2.9 2.9 QFSS











Carbonate Raw mg/L HY 1 1 0 0.1 0.1 0.1 QFSS Treated HY 1 1 0 01 0.1 0.1 QFSS






Treated W 364 364 0 0.59 0.89 0.80 WTP Reticulation M 13 13 0 0 0.79 0.69 QFSS

Nitrate Raw mg/L HY 1 1 0 0.5 0.5 0.5 QFSS Treated HY 1 1 0 05 0.5 0.5 QFSS







Reticulation HY 2 2 0 0.01 0.01 0.01 QFSS Aluminium Raw mg/L HY 1 1 0 <0.05 <0.05 <0.05 QFSS
























Annual Nickel Metals





Table 4 - Imbil Water Analysis

Parameter

Scheme

Units

Frequency of

sampling Required


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory name






Reticulation M 24 0 0 0 0 0 QFSS pH Raw HY 1 1 0 753 7.53 7.53 QFSS














Reticulation HY 1 1 0 247 247 247 QFSS True Colour Raw Hazen HY 1 1 0 13 13 13 QFSS





















Chloride Raw

mg/L HY 1 1 0 69 69 69 QFSS


Fluoride Raw mg/L HY 1 1 0 0.09 0.09 0.09 QFSS Treated HY 1 1 0 0.14 0.14 0.14 QFSS

Reticulation HY 1 1 0 0.11 0.11 0.11 QFSS Nitrate Raw mg/L HY 1 1 0 0.5 0.5 0.5 QFSS


Sulphate Raw

mg/L HY 1 1 0 10.0 10.0 10.0 QFSS


Iron Raw

mg/L HY 1 1 0 0.01 0.01 0.01 WTP


Manganese Raw

mg/L HY 1 1 0 0.01 0.01 0.01 WTP


Zinc Raw

mg/L HY 1 1 0 0.01 0.01 0.01 QFSS


Aluminium Raw

mg/L HY 1 1 0 0.05 0.05 0.05 QFSS


Boron Raw

mg/L HY 1 1 0 0.03 0.03 0.03 QFSS


Copper Raw

mg/L HY 1 1 0 0.03 0.03 0.03 QFSS



Raw mg/L

HY 1 1 0 0.043 0.043 0.043 QFSS Treated HY 1 1 0 0.007 0.007 0.007 QFSS

Reticulation HY 1 1 0 0.011 0.011 0.011 QFSS

Annual Arsenic Metals

Raw mg/L





Raw mg/L



Annual Chromium Metals

Raw mg/L




Raw mg/L



Annual Iron Metals Raw

mg/L HY 1 1 0 0.15 0.15 0.15 QFSS


Annual Lead Metals Raw

mg/L HY 1 1 0 0.0001 0.0001 0.0001 QFSS


Annual Manganese Metals

Raw mg/L



Annual Nickel Metals Raw

mg/L HY 1 1 0 0.0015 0.0015 0.0015 QFSS


Annual Zinc Metals Raw

mg/L HY 1 1 0 0.004 0.004 0.004 QFSS



Table 5- Kandanga Water Analysis

Parameter

Scheme

Units Frequency

of sampling


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory name





E. Coli Raw mpn/100mL - Treated - - - - - - - -



Total Hardness Raw mgCaCO3/L HY 1 1 0 185 185 185 QFSS Treated M 22 22 0 60.0 194.0 160.0 WTP




Reticulation HY 1 1 0 170 170 170 QFSS Residual Alkalinity Raw meq/L HY 1 0 0 0 0 0 QFSS








Reticulation HY 1 1 0 294 294 294 QFSS True Colour Raw Hazen HY 1 1 0 1 1 1 QFSS

Treated W 54 54 0 1 1 1 WTP Reticulation HY 1 1 0 1 1 1 QFSS

Turbidity Raw NTU HY 1 1 0 1 1 1 QFSS Treated W 54 54 0 0.07 0.35 0.13 WTP

Reticulation HY 1 1 0 1 1 1 QFSS pH Saturation Raw HY 1 1 0 8.0 8.0 8.0 QFSS

















Table 6 - Kilkivan Water Analysis

Parameter

Scheme

Units Frequency

of sampling


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory name



Trihalomethanes Raw mg/L - - - - - - - - -


E. Coli Raw mpn/100mL - - - - - - - - - Treated - 1 0 0 0.0 0.0 0.0 QFSS

Reticulation M 23 0 0 0.0 0.0 0.0 QFSS pH Raw HY 4 4 0 7.56 7.71 7.65 QFSS





Alkalinity Raw mgCaCO3/L HY 4 4 0 231 599 360 QFSS Treated M 26 26 0 90 178 145 WTP







Raw mg/L HY 4 4 0 412 1030 674 QFSS Treated M 26 26 0 210 320 281 WTP



Treated W 247 0 0 0.0 0.0 0.0 WTP Reticulation HY 1 1 0 1 1 1 QFSS



Treated HY 1 1 0 80 80 8.0 QFSS Reticulation HY 1 1 0 7.9 7.9 7.9 QFSS

Saturation Index Raw HY 4 4 0 -0.1 0.5 0.3 QFSS Treated HY 1 1 0 -0.2 -0.2 -0.2 QFSS




























Boron Raw

mg/L HY 4 4 0 0.05 0.05 0.05 QFSS


Copper Raw

mg/L HY 4 4 0 0.03 0.03 0.03 QFSS



Raw mg/L



Annual Arsenic Metals

Raw mg/L





Raw mg/L



Annual Chromium Metals

Raw mg/L




Raw mg/L



Annual Iron Metals Raw

mg/L HY 4 4 0 0.025 0.27 0.1015 QFSS


Annual Lead Metals Raw

mg/L HY 4 4 0 0.0001 0.0002 0.0001 QFSS


Annual Manganese Metals

Raw mg/L



Annual Nickel Metals Raw

mg/L HY 4 4 0 0.001 0.0028 0.0014 QFSS


Annual Zinc Metals Raw

mg/L HY 4 4 0 0.003 0.009 0.0057 QFSS



Table 7 - Rainbow Beach Water Analysis

Parameter

Scheme

Units Frequency

of sampling


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory name






Reticulation W 83 0 0 0.0 0.0 0.0 QFSS pH Raw HY 2 2 0 5.10 5.11 5.11 QFSS


Total Hardness Raw mgCaCO3/L HY 2 2 0 7.6 9.0 8.3 QFSS Treated M 12 12 0 8 16 11 WTP

Reticulation HY 1 1 0 10 10 10 QFSS Temporary Hardness

Raw mgCaCO3/L HY 2 2 0 2.8 2.8 2.8 QFSS Treated HY 1 1 0 9 9 9 QFSS

Reticulation HY 1 1 0 10 10 10 QFSS Alkalinity Raw mgCaCO3/L HY 2 2 0 3 3 3 QFSS

Treated M 14 14 0 114 208 150 WTP Reticulation HY 1 1 0 147 147 147 QFSS

Residual Alkalinity Raw meq/L HY 2 0 0 0.0 0.0 0.0 QFSS Treated HY 1 1 0 1.6 1.6 1.6 QFSS

Reticulation HY 1 1 0 2.7 2.7 2.7 QFSS Silica Raw mg/L HY 2 2 0 9.0 10.0 9.5 QFSS


Total Dissolved Ions Raw mg/L HY 2 2 0 47.0 54.0 50.5 QFSS Treated HY 1 1 0 195.0 195.0 195.0 QFSS

Reticulation HY 1 1 0 290.0 290.0 290.0 QFSS Total Dissolved

Solids Raw mg/L HY 2 2 0 54.0 61.0 57.5 QFSS

Treated HY 1 1 0 149.0 149.0 149.0 QFSS


Reticulation HY 1 1 0 210.0 210.0 210.0 QFSS True Colour Raw Hazen HY 2 2 0 1.0 3.0 2.0 QFSS

Treated W 365 365 0 1 2 1 WTP Reticulation HY 1 1 0 1.0 1.0 1.0 QFSS







Sodium Raw mg/L HY 2 2 0 13.0 15.0 14.0 QFSS Treated HY 1 1 0 53.0 53.0 53.0 QFSS

Reticulation HY 1 1 0 77.0 77.0 77.0 QFSS Potassium Raw mg/L HY 2 2 0 0.40 0.60 0.50 QFSS

Treated HY 1 1 0 0.50 0.50 050 QFSS Reticulation HY 1 1 0 0.60 0.60 0.60 QFSS

Calcium Raw mg/L HY 2 2 0 0.40 0.70 0.55 QFSS Treated HY 1 1 0 0.90 0.90 0.90 QFSS

Reticulation HY 1 1 0 1.80 1.80 1.80 QFSS Magnesium Raw mg/L HY 2 2 0 1.60 1.80 1.70 QFSS



Reticulation HY 1 0 0 0.0 0.0 0.0 QFSS Bicarbonate Raw mg/L HY 2 2 0 4.0 4.0 4.0 QFSS




















Treated HY 1 1 0 0.03 0.03 0.03 QFSS Reticulation Y 1 1 0 0.03 0.03 0.03 QFSS


















Metals Raw mg/L HY 2 2 0 0.0012 0.0028 0002 QFSS







Table 8 - Tin Can Bay / Cooloola Cove Water Analysis

Parameter

Scheme

Units Frequency

of sampling


No of samples in

which parameter

was detected

No. of samples



Limit of reporting

Laboratory name






Reticulation W 95 0 0 0.0 0.0 0.0 QFSS pH Raw HY 1 1 0 4.8 4.8 4.8 QFSS



Reticulation HY 2 2 0 7.5 7.5 7.5 QFSS Temporary Hardness Raw mgCaCO3/L HY 1 1 0 1 1 1 QFSS

Treated HY 1 1 0 7 7 7 QFSS Reticulation HY 2 2 0 7.5 7.5 7.5 QFSS

Alkalinity Raw mgCaCO3/L HY 1 1 0 2 2 2 WTP Treated M 24 24 0 30 74 50 WTP

Reticulation HY 2 2 0 43 44 43.5 QFSS Residual Alkalinity Raw meq/L HY 1 0 0 0 0 0 QFSS

Treated HY 1 1 0 1 1 1 QFSS Reticulation HY 2 2 0 0.70 0.70 0.70 QFSS

Silica Raw mg/L HY 1 1 0 6.0 6.0 6.0 QFSS Treated HY 1 1 0 6.0 6.0 6.0 QFSS

Reticulation HY 2 2 0 5.0 6.0 5.5 QFSS Total Dissolved Ions Raw mg/L HY 1 1 1 38 38 38 QFSS





Reticulation HY 2 2 0 178 179 178.5 QFSS True Colour Raw Hazen HY 1 1 0 161 161 161 QFSS

Treated W 365 365 0 1 2 1 WTP Reticulation HY 2 2 0 1 1 1 QFSS








Reticulation HY 2 2 0 59 60 59.5 QFSS Potassium Raw mg/L HY 1 1 0 0.3 0.3 0.3 QFSS


Calcium Raw mg/L HY 1 1 0 1.0 1.0 1.0 QFSS Treated HY 1 1 0 1.0 1.0 1.0 QFSS

Reticulation HY 2 2 0 1.4 1.8 1.6 QFSS Magnesium Raw mg/L HY 1 1 0 1.0 1.0 1.0 QFSS


Hydrogen Raw mg/L HY 1 0 0 0.0 0.0 0.0 - QFSS Treated HY 1 0 0 0.0 0.0 0.0 QFSS









Treated D 365 365 0 0.0 0.92 0.79 WTP Reticulation M 12 12 0 0.65 0.82 0.77 QFSS

Nitrate Raw mg/L HY 1 1 0 0.5 0.5 0.5 QFSS Treated HY 1 1 0 05 0.5 0.5 QFSS

















Drinking Water Quality Management Plan 2017-18 Page 56 of 75

GLOSSARY

< Less than.

> Greater than.

ADWG Australian Drinking Water Guidelines 2011 published by the National Health and Medical Research Council of Australia.

Bulk Water The treated water supplied from the Queensland Bulk Water Authority (SEQWater) to distributor retailers, including Gympie Regional Council.

CFU/100mL Colony Forming Units per 100 millilitres.

DNRME Department of Natural Resources Mines and Energy (Queensland Government).

Disinfectant An agent that destroys or inhibits the activity of microorganisms which cause disease. Queensland Urban Utilities uses either chlorine or chloramine.

DWQMP Drinking Water Quality Management Plan as required by the Water Supply (Safety & Reliability) Act 2008.

E. coli Escherichia coli, a bacterium whose presence in water indicates that the water may be contaminated by faecal matter and therefore there is the potential to cause illness when people drink the water.

km Kilometre, which is 1,000 metres.

Megalitre (ML) One million litres.

mg/L Milligrams per litre.

MPN/100mL Most Probable Number per 100 millilitres.

Network An arrangement or system of pipes, pumps and reservoirs used for distributing water.

NTU Nephelometric Turbidity Unit- a measure of turbidity which is the cloudiness or haziness of water caused by particles that are generally invisible to the naked eye. The measurement of turbidity is a key test of water quality.


Reservoir A water tower or tank used for the storage of treated water within the water distribution system.

QFSS Queensland Forensic and Scientific Services, Health Support Queensland.

Scheme The system distributing drinking water to customers.

SEQWater Queensland Bulk Water Supply Authority, trading as SEQWater. The bulk drinking water provider for Gympie Regional Council.

Stakeholder All those who are either affected by or who can affect the activities of an organisation, namely customers, governments, regulators, the media, non-government organisations, local residents and employees.

The Regulator The Department of Natural Resources Mines & Energy (DNRME).

THMs Total Trihalomethanes - a group of disinfection by-products that generally form when chlorine is used to disinfect drinking water.

WTP Water Treatment Plant.


Progress against the risk management improvement program in the approved DWQMP • Program of works have been developed to remove cross connections, install air gaps and remove

bypasses to ensure untreated water is not supplied to the network.

• Program of works has been developed to install new sample taps and service lines to ensure sample integrity.

• Commenced the implementation of the SCADA strategy to upgrade all sites to ClearSCADA and an overarching IP WAN secure network.

• Commenced a multi-year project to increase and expand the “online” monitoring of water quality across the eight WTPs. This project will ensure that every plant follows industry best practice into the future, with the implementation of automation and online control.


Table 18 – Whole of System Risk Register including Progress against the risk management improvement program in the approved DWQMP- All Schemes Residual Risk RMIP

Process Step

Primary hazard

Other hazards managed by same barriers

Source of Hazard/Event

Maximum Risk

Primary Preventive Measure

Other Preventative Measures

Co

nseq

uenc

e

Li

kelih

ood

Ri

sk L

evel

Unc

erta

inty

CC

P /

OCP

?

Im

med

iate

(3

0/06

/201

8)

Sh

ort

Term

(3

0/06

/201

9)

Long

Ter

m

(30/

06/2

021)

Comments

Whole of System

Bacteria/ Virus (Reticulation

Reservoir ingress (into recently inspected reservoirs, those believed to have been the highest

Extreme 20

Disinfection residual

Reservoir integrity, preventive maintenance programs (5 yearly cleaning unless required sooner, and external inspection)

Catastrophic

Unlikely

High 10

Reliable

N

Address vermin proofing concerns at highest risk reservoirs (from 2016-17 inspection reports)

Program of reservoir hatch and ladder enclosure replacements

Mitigated risk scoring based on findings of inspection reports

Bacteria/ Virus (Reticulation)

Reservoir ingress (into those reservoirs not inspected recently)

Extreme 20


Reservoir integrity, preventive maintenance programs (5 yearly cleaning unless required sooner, and external inspection)

Catastrophic

Possible

High 15

Estimate

Develop Reservoir Inspection Procedure

Inspect and clean 10 reservoirs not already inspected (based on perceived risk); Develop Reservoir Inspection Procedure

Inspect and clean any remaining reservoirs (not covered in 17-18 or 18-19)

Although these reservoirs were identified as lower risk, the high level of uncertainty resulted in the risk assessment team scoring likelihood as "possible" (until proven otherwise)

Bacteria/ Virus

Mains breaks

Extreme 20


Mains break repair work instruction (isolate supply, repair break, flush until clear)

Catastrophic

Rare

Medium 6

Confident

Protozoa (Naeglaria)

Opportunistic ingress, elevated

Medium 5 Disinfection residual Major Rare Medium 5 Estimate Protozoa

(Crypto/

Reservoir ingress/ mains breaks

High 15

Reservoir integrity

Mains break repair work instruction (isolate supply, repair break, flush until clear)

Catastrophic

Rare

Medium 6

Reliable

Loss of Supply Power failure High 15 Reservoir storage backup generators (hire) Catastrophic Rare Medium 6 Confident Loss of Supply Drought High 15 Tanker water/

alternate source Drought management plan - water restrictions

Catastrophic Rare Medium 6 Confident Loss of Supply Flood High 15 Reservoir storage Disaster management plan Catastrophic Rare Medium 6 Confident

Protozoa (Crypto/ Giardia) (Retic)

Flood

High 15

Pressurised network

Repair as soon as possible, disaster management plan

Catastrophic

Unlikely

High 10

Unreliable Identify key locations and

install flow/pressure monitoring (for confirmation of

Bacteria/ Virus (Reticulation

Backflow Extreme 20 Disinfection residual Plumbing regulations, regular audits/inspections

Catastrophic Rare Medium 6 Estimate Council to check STP backflow prevention measures

Protozoa (Crypto/

Hazardous chemicals

Backflow

High 15

Plumbing regulations, regular

positive pressure in network

Catastrophic

Rare

Medium 6

Estimate

All hazards

Terrorism/ sabotage

Extreme 25

Site security

Security fencing/ limited access to reservoirs/ regular

Catastrophic

Rare

Medium 6

Estimate

Loss of Supply

accidental damage/ mine shaft collapse

High 15

Response to main break

Monitor ground subsidence, historical mine capping, rezone to maintain supply, Council mains on external website, reservoir levels

Catastrophic

Rare

Medium 6

Unreliable

Loss of Supply PLC failure/ lightning

strike/ rough power

High 15

Reservoir storage

Incident management plan

Catastrophic

Unlikely

High 10

Reliable Review control systems at

WTPs and consider renewal strategy

Goomeri treatment plant PLC is aged and replacement parts may not be available

All hazards

Human Error

Extreme 25

Staff training, fortnightly head operator/ reticulation meetings

All staff trained to Cert 3, CCPs, other procedures and work instructions

Catastrophic

Unlikely

High 10

Estimate

Review EHO procedure for response to verification monitoring results

Develop "take 5" for water quality considerations; Review all operational procedures listed in the

Develop succession plan for operators; Review sampling tap design, and install new verification monitoring locations

Manganese Iron Steel asset corrosion, older assts

Medium 9 Reactive flushing Minor Possible Medium 6 Reliable Turbidity (Retic) Mains breaks, change of

flow direction/velocity Medium 6 Reactive flushing Minor Possible Medium 6 Reliable

Taste and odour Free chlorine residual

>0.6mg/L

High 12 Chlorine decay after dosing - aim

to achieve at least 0.2mg/L in majority of network

Minor

Likely

Medium 8

Confident Mitigated risk consequence

lowered, as effect will not be uniform throughout the system

Disinfection byproducts

(surface water)

Disinfection

byproducts (bores)

Reactions with organic matter

High 12 Control of chlorination (refer to scheme risk

Moderate

Likely

High 12 Investigative monitoring for

THMs to determine need/frequency for inclusion in


Chlorate

Breakdown of sodium hypochlorite

High 12

Various (refer to scheme risk assessments)

Higher frequency deliveries at smaller schemes should limit breakdown, but this needs to be

Moderate

Likely

High 12 Investigative monitoring for

chlorate to determine need/frequency for inclusion in verification monitoring

Chlorate not proactively managed at this stage

All hazards Operation of a bypass valve

allowing untreated water into the reticulation

Extreme 25

Various (refer to scheme risk assessments)

Catastrophic

Unlikely

High 10

Cap and clearly mark all bypass valves

Alter bypass pipework to include air gaps


Taste and odour

Offline reservoir returned into service, supply of stagnant or potentially contaminated water to customers (with no chlorine residual barrier)

Extreme 20

Dose chlorine, and undertake water quality testing before returning a reservoir to service.

Catastrophic

Unlikely

High 10

Calculate C.t for all schemes Develop Water Hygiene Procedure (include recommissioning of offline assets)

Develop Water Hygiene Procedure

(include recommissioning of offline assets)


Table 19 – Progress against the risk management improvement program in the approved DWQMP- Amamoor

Residual Risk RMIP

Process Step

Primary hazard

Other hazards managed by

same barriers


Maximum Risk

Primary

Preventive Measure


Co

nseq

uenc

e

Li

kelih

ood

Ri

sk L

evel

Unc

erta

inty

CC

P /

OCP

?

Imm

edia

te

(30/

06/2

018)

Sh

ort

Term

(3

0/06

/201

9)

Lo

ng T

erm

(3

0/06

/202

1)

Comments

Amamoor Creek

Bacteria/ Virus (Gympie, Mary

Valley, Kinbombi)

Unprotected catchment, Kayak launch at intake

Extreme 25

Chlorination OCP

Conventional filtration, daily operational checks

Catastrophic

Rare

Medium 6

Reliable

N

Protozoa (Crypto/ Giardia)

(Gympie, Mary Valley

Turbidity


Extreme 25

Filtration

Catastrophic

Possible

High 15

Estimate

Full treatment plant upgrade including monitoring and shutdowns; Develop CCP for Filtration

Manganese Iron Naturally occuring Medium 9 Prechlorination Disinfection (oxidation) Moderate Unlikely Medium 6 Estimate Heavy metals Mining activities, natural geology Medium 6 Full treatment process Moderate Rare Low 3 Estimate Loss of Supply Flood / loss of power supply / raw

water main break High 15 Submerged intake Underground power, disaster management Catastrophic Rare Medium 6 Reliable

ACH Blend dosing


(Gympie, Mary Valley,

Underdose Coagulant

Extreme 25

Dosing checked daily and adjusted based on operational monitoring

Catastrophic

Likely

Extreme 20

Estimate

N

Full treatment plant upgrade including monitoring and shutdowns

Raw water turbidity up to 4000 NTU - can be difficult to achieve acceptable coagulation. Filter breakthrough becomes more likely.

Aluminium

Aluminium overdose

Medium 9


Moderate

Rare

Low 3

Reliable

Pre-chlorination

Chlorine

Overdose

High 12

Dosing checked daily and adjusted

Underload protection on pumps - shut down plant. Dilution in reservoir.

Moderate

Rare

Low 3

Reliable

N

Manganese

Iron

Naturally occuring, underdose of chlorine

Medium 9

Prechlorination

Filtration, daily operator checks, disinfection (oxidation)

Moderate

Unlikely

Medium 6

Estimate

Maintain 0.5 mg/L after prechlorination. Were issues 12 months ago, but now understand treatment capability.


(surface water)

Reaction with organic matter

High 12

Chlorination OCP

Moderate

Likely

High 12

Unreliable

Refer to Whole of System RMIP (DBPs)

Predosing prior to coagulation has a high likelihood of generating disinfection byproducts

Chlorate

Sodium hypochlorite breakdown

High 12

Twice per week deliveries of chlorine lowers risk of hypochlorite solution

Moderate

Possible

Medium 9

Unreliable

Process bypass


(Gympie Mary

Turbidity,

Manganese, Iron

Present in raw water

Extreme 25

Not used under normal operation

Operator training, only use under incident management team

Catastrophic

Unlikely

High 10

Estimate

N

Refer to Whole of System RMIP (Bypass)

Plant upgrade to consider removing bypass


Valley, Kinbombi)


Extreme 25



Catastrophic

Unlikely

High 10

Estimate


Plant upgrade to consider removing

Filtration



Kinbombi)

Turbidity, Manganese, Iron

Filter breakthrough

Extreme 25

Daily operator checks and filter backwashing

Close monitoring under poor raw water conditions

Catastrophic

Likely

Extreme 20

Estimate

N

Full treatment plant upgrade including monitoring and shutdowns; Develop CCP for Filtration at new WTP

Smaller storage for Amamoor means less opportunity to not operate when raw water quality is compromised. Backwash frequency can be as low as every 15 minutes. Not suitable for CCP/OCP with current WTP, but will be with new WTP


Valley, Kinbombi)

Chlorine underdosing, pump failure

Extreme 25

Disinfection OCP

Prechlorination, dedicated supply main to reservoir

Catastrophic

Unlikely

High 10

Reliable

Full treatment plant upgrade including monitoring and

Chlorine Chlorine overdose High 12 Disinfection OCP Underload protection on pumps - shut down plant. Dilution in reservoir.

Moderate Rare Low 3 Reliable


Disinfection


(surface water)


High 12

Disinfection OCP

Moderate

Likely

High 12

Unreliable

Y Refer to Whole of

System RMIP (DBPs)

Chlorate


High 12


Moderate

Possible

Medium 9

Unreliable

Reservoir Storage

Bacteria/ Virus

Reservoir ingress

Extreme 20

Sealed tank

Disinfectant residual

Catastrophic

Unlikely

High 10

Estimate

N

Refer to Whole of System RMIP (Reservoir



Central box gutter

Protozoa (Crypto/

Reservoir ingress

High 15

Sealed tank

Catastrophic

Unlikely

High 10

Estimate




Central box gutter


Table 20 – Progress against the risk management improvement program in the approved DWQMP- Imbil Residual Risk RMIP

Process Step

Primary hazard



Maximum Risk



Co

nseq

uenc

e

Li

kelih

ood

Ri

sk L

evel

Unc

erta

inty

CCP

/ O

CP?

Imm

edia

te

(30/

06/2

018)

Shor

t Te

rm

(30/

06/2

019)

Long

Ter

m

(30/

06/2

021)

Comments

Borumba Dam


Valley, Kinbombi)

Unprotected catchment

Extreme 25

Disinfection CCP

UV disinfection

Catastrophic

Rare

Medium 6

Confident

N

Protozoa

(Crypto/ Giardia) (Gympie, Mary

Valley

Turbidity


Extreme 25

Filtration CCP

UV disinfection

Catastrophic

Rare

Medium 6

Confident

Cyanobacterial toxins

Algal blooms High 16 Chlorination Major Rare Medium 5 Reliable Cyanobacteria Algal blooms High 15 Filtration CCP plant shutdown on high turbidity Moderate Unlikely Medium 6 Reliable Manganese Iron Naturally occuring Medium 9 Coagulation oxidation Moderate Unlikely Medium 6 Reliable Taste and odour Algal blooms High 12 Filtration CCP oxidation Moderate Possible Medium 9 Unreliable Heavy metals Mining activity past or present Medium 6 Full treatment process Moderate Rare Low 3 Reliable

Yabba Creek


Valley, Kinbombi)


Extreme 25

Disinfection CCP

UV disinfection

Catastrophic

Rare

Medium 6

Confident

N

Protozoa

(Crypto/ Giardia) (Gympie, Mary

Valley


Extreme 25

Filtration CCP

UV disinfection

Catastrophic

Rare

Medium 6

Confident

Manganese Iron Naturally occuring Medium 9 Coagulation Filtration CCP Moderate Unlikely Medium 6 Reliable Heavy metals Medium 6 Full treatment process Moderate Rare Low 3 Reliable Loss of Supply Raw water pumps fail/ raw water

main break / flood/ power supply High 15 Engineering design Treated water supply 2-3 days, disaster management Catastrophic Rare Medium 6 Reliable

Pre-chlorination

Chlorine Overdose High 12 Disinfection CCP Online monitoring and control Moderate Unlikely Medium 6 Confident

N

Manganese Iron Naturally occuring, underdose of chlorine Medium 9 Disinfection CCP Online monitoring and control Moderate Unlikely Medium 6 Confident single predose chlorine pump

Cyanobacterial to ins

Algal blooms, underdose of chlorine High 16 Disinfection CCP Major Rare Medium 5 Reliable Disinfection byproducts

(surface water)


High 12

Disinfection CCP

Moderate

Likely

High 12

Estimate Refer to Whole of System RMIP (DBPs)

Chlorate


High 12

High frequency deliveries of chlorine lowers risk of hypochlorite solution breakdown

Moderate

Possible

Medium 9

Estimate

ACH blend dosing

Protozoa (Crypto/ Giardia) (Gympie, Mary

Valley,

Underdose

Extreme 25

Filtration CCP

Plant will auto shutdown on turbidity critical limit. Dosing checked daily and adjusted based on operational monitoring

Catastrophic

Rare

Medium 6

Reliable

N

Aluminium

Overdose

Medium 9 Dosing checked daily and adjusted based on operational monitoring

Filtration CCP

Moderate

Rare

Low 3

Reliable

Plant bypass


Valley,

Turbidity

Existing bypass through old treatment plant

Extreme 25

Bypass not operated under normal circumstances.

Catastrophic

Unlikely

High 10

Estimate

N



Filter bypass


Valley


Extreme 25 Bypass not operated under normal circumstances.

UV disinfection

Catastrophic

Rare

Medium 6

Confident

N

Turbidity


High 12 Bypass not operated under normal circumstances.

Moderate

Unlikely

Medium 6

Confident

Filtration


Valley

Turbidity

Filter breakthrough/ coagulant underdose

Extreme 25

Filtration CCP

Online monitoring and control, UV, filter to waste. Auto shutdown on turbidity critical limit.

Catastrophic

Rare

Medium 6

Confident

Y

Shutdown at 0.6 NTU for 6 minutes

Manganese Turbidity, iron Filter breakthrough Medium 9 Filtration CCP Shutdown on headloss, turbidity Moderate Unlikely Medium 6 Reliable Filters may be undersized - may have impacts on frequency of backwashing in dirty water events

Chlorine Disinfection (hypo)


Valley, Kinbombi)

Chlorine underdosing

Extreme 25

Disinfection CCP

Prechlorination, online monitoring and control, residual in reservoir

Catastrophic

Rare

Medium 6

Reliable

Y

Chlorine Overdose High 12 Disinfection CCP Online monitoring and control Moderate Unlikely Medium 6 Confident Disinfection

byproducts (surface water)


High 12

Disinfection CCP

Moderate

Likely

High 12

Estimate Refer to Whole of System RMIP (DBPs)

Chlorate


High 12

Twice per week deliveries of chlorine

Moderate

Possible

Medium 9

Estimate


UV Disinfection


Valley

UV failure

Extreme 25

UV interlocked

Filtration CCP

Catastrophic

Rare

Medium 6

Confident

Y


Valley

UV bypass

Extreme 25

Filtration CCP

Bypass not operated under normal circumstances

Catastrophic

Rare

Medium 6

Reliable

Reservoir Storage

Bacteria/ Virus

l

Reservoir ingress

Extreme 20

Sealed reservoirs

Catastrophic

Unlikely

High 10

Reliable

N

Refer to Whole of System RMIP (Reservoir ingress)



Central box gutter, hatch not fully sealed

Protozoa (Crypto/

d

Reservoir ingress

High 15

Sealed reservoirs

Catastrophic

Unlikely

High 10

Reliable Refer to Whole of System RMIP (Reservoir ingress)



Central box gutter, hatch not fully sealed


Table 21 – Progress against the risk management improvement program in the approved DWQMP- Kandanga Residual Risk RMIP

Process Step

Primary hazard


same barriers


Maximum Risk



Co

nseq

uenc

e

Li

kelih

ood

Risk

Lev

el

U

ncer

tain

ty

CC

P /

OCP

?

Im

med

iate

(3

0/06

/201

8)

Sh

ort

Term

(3

0/06

/201

9)

Lo

ng

Term

(3

0/06

/202

1)

Comments

Kandanga Creek


Valley, Kinbombi)


Extreme 25

Chlorination OCP

Conventional filtration, daily operational checks

Catastrophic

Rare

Medium 6

Reliable

N


(Gympie, Mary Valley

Turbidity


Extreme 25

Filtration

Catastrophic

Possible

High 15

Estimate

Full treatment plant upgrade including monitoring and shutdowns; Develop CCP for Filtration

Manganese

Iron Naturally occuring High 12 Prechlorination Disinfection (oxidation) Moderate Unlikely Medium 6 Estimate

Heavy metals Mining activities in catchment

Medium 6

Full treatment process

Moderate

Rare

Low 3 Single lead sample at 0.011 mg/L associated with other metals - appears to be isolated to one sample tap.

Loss of Supply Flood/ loss of power supply / raw water main break

High 15 Submerged intake Underground power, disaster management

Catastrophic Rare Medium 6 Reliable

ACH blend dosing


(Gympie, Mary

Coagulant Underdose

Extreme 25

Filtration


Catastrophic

Possible

High 15

Reliable

N

Full treatment plant upgrade including monitoring and h d

Aluminium

Coagulant overdose


Moderate

Rare

Low 3

Reliable

Pre-chlorination

Chlorine

Chlorine overdose

High 12 Dosing checked daily and adjusted

Underload protection on pumps - shut down plant. Dilution in

Moderate

Rare

Low 3

Reliable

N

Manganese (Kandanga

Iron

Naturally occuring, underdose of chlorine

High 12

Prechlorination

Filtration, daily operator checks, disinfection (oxidation)

Moderate

Unlikely

Medium 6

Estimate Maintain 0.5 mg/L after prechlorination.

Were issues 12 months ago, but operational improvements made


(surface water)


High 12

Chlorination OCP

Moderate

Likely

High 12

Unreliable Refer to Whole of System RMIP (DBPs)

Predosing prior to coagulation has a high likelihood of generating disinfection byproducts

Chlorate


High 12


Moderate

Possible

Medium 9

Unreliable

Process bypass


(Gympie Mary

Turbidity,

Manganese, Iron


Extreme 25

Air gap

Catastrophic

Rare

Medium 6

Certain

N


Valley, Kinbombi)


Extreme 25

Air gap

Catastrophic

Rare

Medium 6

Certain

Filtration



Kinbombi)

Turbidity,

Manganese, Iron

Filter breakthrough

Extreme 25

Daily operator checks and filter backwashing

Catastrophic

Likely

Extreme 20

Estimate

N

Full treatment plant upgrade including monitoring and shutdowns; Develop CCP for Filtration at new WTP

Many of the high results are believed to be due to formation of Mn oxides after chlorine dosing - however, sufficient evidence that turbidty breakthrough is occuring, so minimal credit given for removal of protozoa. Not suitable for CCP/OCP with current WTP, but will be with new WTP.

Disinfection


Valley, Kinbombi)

Chlorine underdosing, pump failure

Extreme 25

Disinfection OCP

Prechlorination, direct supply to reservoir

Catastrophic

Unlikely

High 10

Reliable

Y

Full treatment plant upgrade including monitoring and

Chlorine

Overdose

High 12 Disinfection OCP

Underload protection on pumps - shut down plant. Dilution in

Moderate

Rare

Low 3

Reliable


(surface water)


High 12

Moderate

Likely

High 12

Unreliable Refer to Whole of System RMIP (DBPs)


Chlorate


High 12


Moderate

Possible

Medium 9

Unreliable

Contact Tank

Bacteria/ Virus

Insufficient contact time, ingress into reservoir

Extreme 20 Sealed tank Dedicated rising main to reservoir Catastrophic Rare Medium 6 Confident

N

Protozoa (Crypto/

Ingress into tank High 15 Sealed tank Catastrophic Rare Medium 6 Confident Reservoir Storage

Bacteria/ Virus

Reservoir ingress

Extreme 20

Sealed tank

Disinfectant residual

Catastrophic

Unlikely

High 10

Reliable

N

Refer to Whole of System RMIP



Central box gutter

Protozoa (Crypto/

Reservoir ingress

High 15

Sealed tank

Catastrophic

Unlikely

High 10

Reliable Refer to Whole of System RMIP



Central box gutter


Table 22 – Progress against the risk management improvement program in the approved DWQMP- Goomeri Residual Risk RMIP

Process Step

Primary hazard



Maximum Risk



Co

nseq

uenc

e

Li

kelih

ood

Ri

sk L

evel

Unc

erta

inty

CC

P /

OCP

?

Im

med

iate

(3

0/06

/201

8)

Sh

ort

Term

(3

0/06

/201

9)

Long

Ter

m

(30/

06/2

021)

Comments

Surface Water (Kinbombi Creek,

Weir, OS Storages)


Valley, Kinbombi)

Grazing, human activity

Extreme 25

Chlorination OCP

Full treatment, including ozone and secondary chlorination on supply to

Catastrophic

Rare

Medium 6

Confident

N


(Gympie, Mary

Turbidity


Extreme 25

Filtration OCP

Ozonation

Catastrophic

Rare

Medium 6

Reliable

No online monitoring from individual filters. Daily grab samples suggest that there are likely to be spikes > 0.5 NTU. Ozonation is not sufficient to expect Crypto removal (<32mg.min/L)


Annual algal blooms - some potentially toxic species have been identified

High 16

Ozone/BAC

Chlorine oxidation

Major

Rare

Medium 5

Confident

Manganese Iron Naturally occurring Medium 9 Coagulation Moderate Unlikely Medium 6 Confident Hardness/TDS Naturally occurring High 15 N/A Ion exchange water softener (but not

currently used) Moderate Almost Certain High 15 Confident Reevaluate ion exchange unit

options Whilst a high risk, this is lower priority as it is not based

on a health outcome

Cyanobacteria Annual blooms High 15 Filtration OCP Moderate Rare Low 3 Reliable Taste and odour Anaerobic processes in pipeline High 12 Ozone/BAC Filtration of algal cells Moderate Rare Low 3 Confident Heavy metals Naturally occurring (geology),

mining in catchment Medium 6 WTP Treatment Moderate Rare Low 3 Reliable

Loss of Supply Raw water infrastructure failure High 15 Disaster Management Multiple sources Minor Unlikely Low 4 Confident

Groundwater

Bacteria/ Virus (Western b

Ingress into bores

High 10

Chlorination OCP

Full treatment, including ozone and secondary chlorination on supply to

Catastrophic

Rare

Medium 6

Confident

N


Turbidity

Ingress into bores

High 10

Filtration OCP

Ozonation

Catastrophic

Rare

Medium 6

Confident Ozonation is not sufficient to expect Crypto

removal (<32mg.min/L)

Manganese Iron Naturally occurring Medium 9 Coagulation Moderate Unlikely Medium 6 Confident Hardness/TDS Naturally occurring High 15 Ion exchange water softener (but not

currently used) Moderate Almost Certain High 15 Confident Reevaluate ion exchange unit

options Whilst a high risk, this is lower priority as it is not based

on a health outcome Heavy metals Naturally occurring (geology) Medium 6 Full treatment process Moderate Rare Low 3 Reliable

Raw Water Bypass

All hazards Accidental or deliberate use of bypass Extreme 25 Not intentionally used Staff training Catastrophic Unlikely High 10 Unreliable N Refer to Whole of System RMIP (Bypass)


Supernatant return


(Gympie Mary


Concentration of oocysts through continual recycling of supernatant

Extreme 25

Filtration OCP

Catastrophic

Unlikely

High 10

Estimate

N

Turn off supernatant return

Remove supernatant return

Coagulation / settling

Turbidity

Colour

Underdose of coagulant

High 12


Filtration OCP

Moderate

Unlikely

Medium 6

Reliable

N

Aluminium Organic

compounds

Overdose of coagulant

Medium 9


Moderate

Unlikely

Medium 6

Reliable

Soda Ash dosing

pH

Underdose of soda ash


Moderate

Unlikely

Medium 6

Confident

N

pH Overdose of soda ash

Medium 9


Moderate

Unlikely

Medium 6

Confident

Sand Filtration


(Gympie, Mary


(Western bores);

Filter breakthrough

Extreme 25

Filtration OCP

Catastrophic

Unlikely

High 10

Reliable

Y

Undertake Filter condition assessment

Filter refurbishment or renewal, install individual online turbidity meters (per bank of 3)

Investigate feasibility of increasing ozone contact tank to allow increased protozoan deactivation, or alternatively cost out a UV system

Ozonation Cyanobacterial toxins

Algal blooms High 16 ORP measurement/

Chlorine oxidation Major Rare Medium 5 Confident

N

Taste and odour Algal blooms High 12 ORP measurement/

Moderate Rare Low 3 Confident Carbon filters No hazards identified N

Primary Disinfection (Hypo)

Chlorine Chlorine overdose High 12 Chlorination OCP Moderate Rare Low 3 Confident

Y


Valley, Kinbombi)

Chlorine underdose

Extreme 25

Chlorination OCP

Catastrophic

Rare

Medium 6

Confident Disinfection byproducts

(surface water)


High 12

Chlorination OCP

Ozone/BAC

Moderate

Possible

Medium 9

Estimate

Chlorate Breakdown of sodium hypochlorite High 12 Moderate Likely High 12 Unreliable Refer to Whole of System RMIP (Chlorate)

Clear

Water Storages

Bacteria/ Virus

Contamination into tank(s) Extreme 20 Chlorination OCP sealed reservoirs- cement roof Catastrophic Rare Medium 6 Confident

N

Protozoa (Crypto/

Contamination into tank(s) High 15 Sealed storages - cement roof Catastrophic Rare Medium 6 Confident

Water softener

Hardness/TDS

Naturally occurring

High 15 Currently bypassed

Moderate

Almost Certain

High 15

Certain

N

Reevaluate ion exchange unit options

Risk has been assessed as unit remaining offline - unlikely to be returned to operation until RMIP action completed.

Secondary disinfection (hypo)

Chlorine Overdose High 12 Chlorination OCP Moderate Rare Low 3 Confident

N


(surface water)


High 12

Chlorination OCP

Ozone BAC

Moderate

Possible

Medium 9

Estimate

Chlorate Breakdown of sodium hypochlorite High 12 Moderate Likely High 12 Unreliable Refer to Whole of System RMIP (Chlorate)

Bacteria/ Virus

Ingress into tank Extreme 20 Sealed storage Currently isolated. Catastrophic Unlikely High 10 Estimate




Reservoir isolated at time of risk assessment, but has been assessed on the basis of it being online


Goomeri Reservoir

Protozoa (Crypto/ Giardia) (Retic)

Ingress into tank High 15 Sealed storage Currently isolated. Catastrophic Unlikely High 10 Estimate

N




Reservoir isolated at time of risk assessment, but has been assessed on the basis of it being online

Chlorine Manual re-dosing causing overdose High 12 Undertaken and managed under ERP Moderate Rare Low 3 Confident Rarely happens, hence the mitigated likelihood score


(surface water)

Water age, low turnover

High 12 Source blend (bores supplement surface

water), ozone BAC

Moderate

Likely

High 12

Estimate Investigate options for

increasing turnover of reservoir

Although Ozone/BAC is expected to reduce precursors, risk has not been mitigated as water age in Goomeri Reservoir is high

Loss of Supply

Goomeri Reservoir offline

High 15

Supply volume in clear water storage at WTP

Catastrophic

Unlikely

High 10

Reliable Network modelling to determine

future options for scheme operation balancing WQ and supply

Mains break could result in loss of supply for most of town without reservoir


Table 23 – Progress against the risk management improvement program in the approved DWQMP- Kilkivan Residual Risk RMIP

Process Step

Primary hazard



Maximum Risk



Co

nseq

uenc

e

Li

kelih

ood

Ri

sk L

evel

Unc

erta

inty

CC

P /

OCP

?

Im

med

iate

(3

0/06

/201

8)

Sh

ort

Term

(3

0/06

/201

9)

Long

Ter

m

(30/

06/2

021)

Comments

Groundwater

Bacteria/ Virus (Western

Grazing, human activity High 10 Disinfection OCP Full treatment process Catastrophic Rare Medium 6 Confident

N

Protozoa

(Crypto/ Giardia) (Western bores)

Turbidity


High 10

Filtration CCP

RO (partial)

Catastrophic

Rare

Medium 6

Confident

Manganese Iron Naturally occurring Medium 9 Filtration CCP Moderate Unlikely Medium 6 Confident Hardness/TDS Naturally occurring High 15 RO Moderate Rare Low 3 Confident Blending to 160 mg/L CaCO3

Bacteria/Virus (Running Creek bore - Kilkivan)

Bore is in the creek bed

High 15

Disinfection OCP

Full treatment process

Catastrophic

Rare

Medium 6

Reliable

Protozoa (Crypto/ Giardia) (Running

Creek bore -

Bore is in the creek bed

Extreme 20

Filtration CCP

RO (partial)

Catastrophic

Rare

Medium 6

Reliable

Loss of Supply Raw water infrastructure failure High 15 Disaster Management Multiple bores Moderate Unlikely Medium 6 Confident

Plant bypass

All hazards

Accidental or deliberate use of bypass

Extreme 25 Not intentionally used

Staff training

Catastrophic

Unlikely

High 10

Reliable

N



Balance Tanks No hazards identified

N

Multimedia filter

Protozoa (Crypto/ Giardia) (Running

Creek bore -

Protozoa (Crypto/ Giardia) (Western bores);

Filter breakthrough

Extreme 20

Filtration CCP

RO (partial), contracted servicing of WTP every 3 months

Catastrophic

Unlikely

High 10

Reliable

Y

Online monitoring of filter turbidity

Manganese

Iron

Raw water

Medium 9

Filtration CCP

RO (partial), contracted servicing of WTP every 3 months

Moderate

Unlikely

Medium 6

Confident

Carbon Filters

Hardness/TDS

Carbon carryover onto RO membranes leading to failure of RO

i

High 15

Contracted servicing (3 monthly)

Moderate

Possible

Medium 9

Reliable

N

Carbon filtration requred to remove organic precursors that could foul RO

Filtered

Water Storages

Protozoa (Crypto/

Contamination into tank(s) High 15 Sealed poly tanks Catastrophic Rare Medium 6 Confident

N

Bacteria/ Virus

Contamination into tank(s) Extreme 20 Sealed poly tanks Chlorination CCP Catastrophic Rare Medium 6 Confident

Reverse Osmosis

Hardness/TDS

Breach of membranes, breakdown of process, improper blending

High 15

RO alarm, conductivity monitoring

Contracted servicing (3 monthly)

Moderate

Unlikely

Medium 6

Reliable

N Have been periods when offline (e.g.

carbon carryover onto membranes). Process is to blend RO and non-RO (filtered) water to 160mg/L hardness

Soda Ash dosing

pH

Underdose

Medium 9


Moderate

Rare

Low 3

Confident

N

pH

Overdose

Medium 9


Moderate

Rare

Low 3

Confident

Disinfection (hypo)

Chlorine pH Chlorine overdose High 12 Chlorination CCP Operational monitoring Minor Rare Low 2 Confident

Y

Bacteria/Virus (Running Creek bore - Kilkivan)

Bacteria/ Virus (Western b

Chlorine underdose

High 15

Chlorination CCP

Catastrophic

Rare

Medium 6

Confident

Disinfection byproducts (Bores)


Medium 9

Chlorination CCP

RO (partial), carbon filters

Moderate

Rare

Low 3

Reliable

Considered less likely as bore source, and treatment should remove precursors. Low chlorine demand

Chlorate

Breakdown of sodium hypochlorite

High 12

Moderate

Likely

High 12

Unreliable

Refer to Whole of System RMIP (Chlorate)

Lower dose rate compared to Goomeri, but longer storage time.

Clear Water Storage

Bacteria/ Virus

i l i

Contamination into tank(s)

Extreme 20

Sealed storage, cement roof

Residual chlorine

Catastrophic

Unlikely

High 10

Estimate

N

Refer to Whole of System RMIP (Reservoir i



Protozoa (Crypto/

i di i

Contamination into tank(s)

High 15


Catastrophic

Unlikely

High 10

Estimate




Bacteria/ Virus

i l i

Ingress into tank

Extreme 20


Residual chlorine

Catastrophic

Unlikely

High 10

Estimate





Kilkivan Reservoir

Protozoa (Crypto/

i di i

Ingress into tank

High 15


Catastrophic

Unlikely

High 10

Estimate

N




Chlorine Manual re-dosing High 12 Undertaken and managed under ERP

Moderate Unlikely Medium 6 Confident Rarely happens, hence the mitigated likelihood score

Disinfection

byproducts (Bores)

Water age, low turnover

Medium 9

Carbon filters & RO (partial)

Moderate

Unlikely

Medium 6

Reliable Precursors believed to be low;

groundwater is low in turbidity and colour, and treatment includes carbon filtration and RO


Table 24 – Progress against the risk management improvement program in the approved DWQMP- Gympie

Residual Risk

RMIP

Process Step

Primary hazard



Maximum Risk

Primary

Preventive Measure


Cons

eque

nce

Li

kelih

ood

Risk

Lev

el

U

ncer

tain

ty

CC

P /

OCP

?

Im

med

iate

(3

0/06

/201

8)

Sh

ort

Term

(3

0/06

/201

9)

Lo

ng

Term

(3

0/06

/202

1)

Comments

Borumba Dam


Valley, Kinbombi)


Extreme 25

Disinfection CCPs (x2)

Catastrophic

Rare

Medium 6

Confident

N


(Gympie Mary

Turbidity


Extreme 25

Filtration CCP

Catastrophic

Rare

Medium 6

Confident


Algal blooms High 16 Chlorination PAC dosing (low dose) Major Rare Medium 5 Reliable Cyanobacteria Algal blooms High 15 Filtration CCP plant shutdown on high turbidity Moderate Unlikely Medium 6 Reliable Manganese Iron Naturally occuring Medium 9 Coagulation oxidation Moderate Unlikely Medium 6 Reliable Taste and odour Algal blooms High 12 PAC dosing Filtration CCP Moderate Possible Medium 9 Reliable Heavy metals Mining activity past or present Medium 6 Full treatment process Moderate Rare Low 3 Reliable

Mary River


Valley, Kinbombi)


Extreme 25 Disinfection CCPs (x2)

Catastrophic

Rare

Medium 6

Confident

N


(Gympie Mary


Extreme 25

Filtration CCP

Catastrophic

Rare

Medium 6

Confident

Manganese Iron Naturally occuring Medium 9 Coagulation Filtration CCP Moderate Unlikely Medium 6 Reliable Heavy metals Mining activity past or present Medium 6 Full treatment process Moderate Rare Low 3 Reliable Loss of Supply Raw water pumps fail/ flood/ power

supply High 15 Backup raw water pump Disaster Management Plan Catastrophic Rare Medium 6 Reliable

PAC dosing Taste and odour Algal blooms High 12 PAC dosing Moderate Unlikely Medium 6 Reliable N pH adjustment

pH

Overdose sodium hydroxide

Medium 9 Dosed water pH monitoring

Dosing as required (high flow low alkalinity)

Moderate

Unlikely

Medium 6

Confident

N Will be moving from Alum to ACH, which should

reduce the need for hydroxide dosing. (seasonal trial)

Plant bypass


(Gympie Mary

All other hazards

Raw water

Extreme 25

Bypass marked and capped

Would not be operated other than in a disaster scenario

Catastrophic

Rare

Medium 6

Confident

N

Supernatan

t return


(Gympie Mary

Concentration through waste recycle

Extreme 25

Filtration CCP

Online monitoring of filtration

Catastrophic

Unlikely

High 10

Estimate

N Investigate possibility of

ceasing this practice and sending supernatant to sewer

8 L/s return ~ 4 % of total flow.

Coagulation / Flocculation / Sedimentation


(Gympie Mary

Turbidity, Colour

Coagulation failure/ underdose, overload of filters & filter breakthrough

Extreme 25

Filtration CCP

Raw water turbidity monitoring, dosed water pH monitoring, settled water turbidity grab samples

Catastrophic

Unlikely

High 10

Reliable

N

Review PLC communication and SCADA alarming to ensure dosing pump failures

Coagulation pump failure alarm to be incorporated into SCADA

previous PACL pump failure that SCADA did not pick up as based off pressure sensor.

Aluminium

Overdose of coagulant(s)


Filtration CCP

Moderate

Rare

Low 3

Reliable

Bypass of filter


(Gympie Mary

bypass from sedimentation tank into clear water

Extreme 25

Not used under normal circumstances

Catastrophic

Unlikely

High 10

Estimate

N



Filtration


(Gympie Mary

Turbidity

Filter breakthrough

Extreme 25

Filtration CCP

Catastrophic

Rare

Medium 6

Reliable

Y

Backwash normally on time (25-30 hours).

Loss of Supply SCADA/ PLC Failure & inability to operate filters manually

High 15 Plant and SCADA design Spare components, and backup computer loaded with SCADA Catastrophic Rare Medium 6 Estimate Unable to run filters on manual.

Fluoridation Fluoride (added) Fluoridation process High 12 Fluoridation OCP Moderate Rare Low 3 Confident Y Dosing into clear water tank

pH adjustment

pH

Underdose of NaOH


Finished water online pH monitoring alarmed and reacted to

Moderate

Rare

Low 3

Reliable

N

pH Overdose of NaOH

Medium 9


Finished water online pH monitoring alarmed and reacted to

Moderate

Rare

Low 3

Reliable

Clear Water Storage


Valley, Kinbombi)

Ingress into Clear water storage

Extreme 25 Sealed storage


Catastrophic

Rare

Medium 6

Confident

N


(Gympie Mary

Ingress into Clear water storage

Extreme 25

Sealed storage

Catastrophic

Rare

Medium 6

Confident

Disinfection (gas - individual

trunk water mains)


Valley, Kinbombi)

Underdosing (Jones Hill)

Extreme 25

Disinfection (Jones Hill) CCP

Dedicated main to reservoir with no customers prior

Catastrophic

Rare

Medium 6

Confident

Y

Dedicated rising main to Reservoir. Confident that Ct is achieved.


Valley, Kinbombi)

Insufficient Ct for disinfection Ferguson Hill

Extreme 25

Disinfection (Ferguson Hill) CCP

Redosing at Reservoir (customers prior)

Catastrophic

Unlikely

High 10

Reliable

Confirm shutdown occurs on low critical limit (disinfection)

CT calculated to be 30 mg.min/L based on equal flow through 2 mains (300 and 375mm) and 1.5 mg/L over 1674m to first customer.

Chlorine Overdosing High 12 Disinfection CCPs (x2) Moderate Unlikely Medium 6 Reliable Disinfection byproducts

(surface water)


High 12 Disinfection CCPs (x2)

Low level PAC dosing

Moderate

Possible

Medium 9

Estimate

Whole of WTP

Loss of Supply

Asset failure

High 15 Plant manned daily

Disaster Management Plan

Catastrophic

Unlikely

High 10

Unreliable

N Full structural

condition assessment for long term reliability

Leaks in concrete walls, some signs of corrosion. Asset nearing end of life.


Re-chlorination (Ferguson Hill)

Chlorine Overdosing High 12 3 x per week Operator checks

Fixed dose rate into reservoir Moderate Possible Medium 9 Reliable

N


(surface water)


High 12


PAC dosing (low dose)

Moderate

Possible

Medium 9

Estimate

Chlorate Sodium hypochlorite decay High 12 Moderate Likely High 12 Estimate Refer to Whole of System RMIP (Chlorate)

Investigate chemical storage options

Reservoir Storage

Bacteria/ Virus

Ingress into reservoirs - Penny Road and Noosa Road WPS

Extreme 20 Residual disinfection Sealed storages Catastrophic Unlikely High 10 Estimate

N




Protozoa (Crypto/

Ingress into reservoirs - Penny Road

and Noosa Road WPS High 15 Sealed storages Catastrophic Unlikely High 10 Estimate




Bacteria/ Virus

Ingress into reservoirs - other storages Extreme 20 Residual disinfection Sealed storages Catastrophic Unlikely High 10 Reliable Refer to Whole of System RMIP (Reservoir ingress)



Central box gutters on reservoirs

Protozoa (Crypto/

Ingress into reservoirs - other storages High 15 Sealed storages Catastrophic Unlikely High 10 Reliable





Loss of Supply Network operations not optimised High 15 Reservoir operating levels Moderate Possible Medium 9 Reliable effect limited to a small number of connections under certain circumstances


Table 25 – Progress against the risk management improvement program in the approved DWQMP- Tin Can Bay/Cooloola Cove

Residual Risk RMIP

Process Step

Primary hazard



Maximum Risk



Cons

eque

nce

Like

lihoo

d

Risk

Lev

el

U

ncer

tain

ty

CC

P /

OCP

?

Im

med

iat

e (30/

06/2

018)

Sh

ort

Term

(3

0/06

/201

9)

Lo

ng T

erm

(3

0/06

/202

1)

Comments

Teewah Creek

Bacteria/ Virus (Teewah

Human activity Extreme 20 Disinfection OCP Full treatment Catastrophic Rare Medium 6 Reliable

N

No online instruments, but daily monitoring.


Turbidity

Human activity

Extreme 20

Filtration OCP

Catastrophic

Rare

Medium 6

Reliable Grab samples demonstrate consistent levels below 0.3 NTU

Colour

Naturally occurring

High 15 Coagulation OCP

Oxidation

Moderate

Unlikely

Medium 6

Reliable Online pH monitoring, and plant shutdown.

Plant not operated if rain expected

Loss of Supply Fire/flood/ loss of power/ raw water main break

High 15 Reservoir storage Disaster management, duplicate raw water mains

Catastrophic Rare Medium 6 Estimate pH Naturally occurring (low pH) Medium 9 Soda ash dosing Moderate Rare Low 3 Confident Raw pH averages 5. Can be 4.5

Coagulation/ Flocculation

Aluminium Alkalinity Overdosing/ alkalinity incorrect

Medium 9 Coagulation OCP Jar testing as required Moderate Unlikely Medium 6 Confident

Y

pH

Alkalinity Natural low pH in raw water

Medium 9

Online monitoring

Daily testing and alter dose rates

Moderate

Unlikely

Medium 6

Confident Low alkalinity water impacts normal

coagulation, but may provide opportunity for enhanced coagulation.

Protozoa (Crypto/ Giardia) (Teewah Creek)

Colour

Underdose coagulant

Extreme 20

Coagulation OCP

Jar testing as required

Catastrophic

Unlikely

High 10

Estimate Control of coagulation process -

possibly streaming current detector or turbidity meter

Sand Filters

Protozoa (Crypto/ Giardia) (Teewah Creek)

Filter breakthrough

Extreme 20

Filtration OCP

Catastrophic

Unlikely

High 10

Estimate

Y

Online monitoring and automated plant shutdown - filtered water turbidity

Turbidity Filter breakthrough High 12 Filtration OCP Moderate Unlikely Medium 6 Estimate

Soda Ash dosing

pH

Underdose soda ash

Medium 9 Dosing checked daily and adjusted based on operational

Moderate

Possible

Medium 9

Reliable

N

pH

Overdose soda ash


Trained operators

Moderate

Possible

Medium 9

Reliable

Fluoridation

Fluoride (added)

Overdose fluoride

High 12

Fluoridation OCP

Engineering design, trained operators, SCADA alarm, dilution in clear water and Cooloola Reservoir before customers

Moderate

Rare

Low 3

Confident

Y

Disinfection (chlorine gas)

Bacteria/ Virus (Teewah Creek)

Chlorine underdose

Extreme 20

Chlorination OCP

Catastrophic

Unlikely

High 10

Reliable

Y

Chlorine leak detection - sensor and alarm

Online monitoring and automated plant shutdown - chlorine residual (Cooloola TCB)

Failure after hours would not be detected until next morning

Chlorine Overdose chlorine High 12 Chlorination OCP Moderate Rare Low 3 Reliable Disinfection byproducts

( f t )


High 12

Chlorination OCP

Moderate

Possible

Medium 9

Estimate low chlorine demand in water

Clear Water Storage


Ingress into tank

Extreme 20


Sealed storage

Catastrophic

Possible

High 15

Estimate

N




Probable points of ingress - centre box gutter. No proactive maintenance at this time as there are safety issues for access (currently being addressed)

Protozoa (Crypto/

Ingress into tank

High 15

Sealed storage

Catastrophic

Possible

High 15

Estimate Refer to Whole of System RMIP (Reservoir ingress)



Cooloola Low

level Reservoirs

Bacteria/ Virus

Ingress into tank

Extreme 20


Sealed storage

Catastrophic

Unlikely

High 10

Estimate

N




Protozoa (Crypto/

Ingress into tank

High 15

Sealed storage

Catastrophic

Unlikely

High 10




Tin Can Bay Ground

level Reservoir

Bacteria/ Virus

l

Ingress into tank

Extreme 20


Sealed storage

Catastrophic

Unlikely

High 10

Estimate

N

Chlorine residual mapping to check network coverage

Investigate to determine if ground level reservoir back feeds into reticulation

Protozoa (Crypto/

Ingress into tank

High 15

Sealed storage

Catastrophic

Unlikely

High 10




Tin Can Bay Tower

Bacteria/ Virus

Ingress into tank

Extreme 20


Sealed storage

Catastrophic

Unlikely

High 10

Estimate

N




Protozoa

(Crypto/

Ingress into tank

High 15

Sealed storage

Catastrophic

Unlikely

High 10





Table 26 – Progress against the risk management improvement program in the approved DWQMP- Rainbow Beach Residual Risk RMIP

Process Step

Primary hazard


same barriers


Maximum Risk

Primary

Preventive Measure


Cons

eque

nce

Like

lihoo

d

Risk

Lev

el

U

ncer

tain

ty

CC

P /

OCP

?

Im

med

iat

e (30/

06/2

018)

Sh

ort

Term

(3

0/06

/201

9)

Lo

ng

Term

(3

0/06

/202

1)

Comments

Bores

Bacteria/ Virus (Rainbow

Ingress through borehead High 10 Disinfection OCP Predosing, filtration Catastrophic Rare Medium 6 Reliable

N


Turbidity

Ingress through borehead

Medium 6

Filtration OCP

Catastrophic

Rare

Medium 6

Reliable

Loss of Supply Bore failure / aquifer depletion / raw water main break

High 15 Disaster Management Multiple bores Catastrophic Rare Medium 6 Reliable Iron Corrosion of steel bore casing Medium 6 Predose chlorine Daily operational checks Moderate Rare Low 3 Confident Bore casings replaced in 3 bores

Taste and odour High 12 Flushing of bores Predose chlorine Moderate Rare Low 3 Confident

Bacteria/ Virus (Rainbow Beach)

Analogue SCADA doesn’t allow better than 30 minute control over remote bores.

High 10

Operator monitoring

OCPs and treatment process

Catastrophic

Unlikely

High 10

Reliable

PLC/ SCADA upgrade

Analogue SCADA issues - dose rates are set point, but plant flow is variable, leading to inconsistent control

Plant bypass



Bypass treatment into reservoirs

High 10



Catastrophic

Unlikely

High 10

Estimate

N



Intent to manually dose reservoirs if bypassed

Prechlorination

Iron

Underdose prechlorine

Medium 6

Predose chlorine

Filtration OCP

Moderate

Rare

Low 3

Confident

N

Raw water monitoring iron does not routinely exceed 0.1 mg/L. Steel casing replaced ~2014

Chlorine

Overdose chlorine

High 12

Disinfection OCP

Operator monitoring, residence time in settling

Moderate

Unlikely

Medium 6

Confident

Settling tank

pH

Overdose soda ash

Medium 9


Operator adjustment as necessary

Moderate

Rare

Low 3

Reliable

N

pH

Underdose soda ash

Medium 9


Operator adjustment as necessary

Moderate

Possible

Medium 9

Reliable

Filter


(Rainbow Beach)

Turbidity, iron

Filter breakthrough

Medium 6

Filtration OCP

Catastrophic

Rare

Medium 6

Confident

Y

Very low risk of Protozoa in catchment. Turbidity is associated with fine sand ingress into bores. Aesthetic guideline is appropriate in this case.

Disinfection (chlorine gas)


Underdosing High 10 Disinfection OCP Prechlorination Catastrophic Rare Medium 6 Confident

Y

Chlorine Chlorine overdosing High 12 Disinfection OCP Daily operator monitoring Moderate Unlikely Medium 6 Confident

Disinfection byproducts (Bores)


Medium 9

Disinfection OCP

Filtration OCP

Moderate

Rare

Low 3

Estimate Dose rates are low due to lack

of chlorine demand. Least likely scheme for THM formation

Soda ash dosing

pH

Overdose soda ash

Medium 9


Moderate

Rare

Low 3

Reliable

N

pH

Underdose soda ash

Medium 9


Moderate

Possible

Medium 9

Reliable

Clear

Water Storage


Ingress into tank Extreme 20 Sealed reservoir Concrete reservoir, integrity good


N

Protozoa (Crypto/

Ingress into tank High 15 Sealed reservoir Concrete reservoir, integrity good



Ingress into tank

Extreme 20

Residual disinfection

Sealed storages

Catastrophic

Unlikely

High 10

Estimate






Reservoirs

Protozoa (Crypto/

Ingress into tank

High 15

Sealed storages

Catastrophic

Unlikely

High 10

Estimate

N





Loss of Supply

Lack of pressure in smaller reservoir at low level

High 15 Reservoir operating levels managed to provide adequate

Moderate

Possible

Medium 9

Reliable Effect limited to a small number

of connections under certain circumstances

DRINKING WATER QUALITY MANAGEMENT PLAN 2017/2018 … · The Gympie Regional Council 2017/18...

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