Long Term Plan Workshop

Transcription

1 Long Term Plan Workshop Water Services Purpose: To discuss Water Supply and high-level direction of the AMP and LTP 13 June 2017

2 What does the community expect of Water Supply? That its there when I turn on the tap! That its safe and OK to drink?

3 Water Supply is primarily about public health protection and risk management. Public Health Our Water Supply Presentation Content Contaminants, legislation & standards (DWSNZ), multi-barrier approach Our sources, treatment and distribution systems Risk Management General Risks Water Safety Plans Havelock North New Projects Operational Risks Existing LTP Projects Condition assessments and renewals Financial Levels of Service, Growth, Climate Change, Fluoridation, Summary, Questions

4 Drinking Water Contaminants Three broad categories of Drinking Water contaminants Microbiological Chemical Physical Microbiological are the most important as they have the potential to cause widespread illness in very short period of time

5 Bacteria doubling every 10mins time hrs bacteria , , ,777, ,073,741, ,719,476,736 E.Coli magnified 15,000 times From human or animal faeces. E-coli used as an indictor of probable presence. Removed by coagulation and filtration, destroyed by Chlorine

6 Viruses Smaller than bacteria Use a living cell to reproduce Hepatitis A Killed by Chlorine

7 Protozoa Cryptosporidium and Giardia Caused many deaths around the world with contaminated drinking water Very resistant to Chlorine No medical treatment Removed by coagulation and filtration, inactivated by UV

8 Cyanobacteria Cross between a bacteria and algae Some produce toxins, others do not Blooms in water column of dams and lakes Forms mats on stones in rivers Many different types Treated with activated carbon Whau Valley Dam 2015

9 Chemical and Physical Generally not as immediate concerns as effects appear over long period. Can be caused by addition of chemicals during treatment processes. Often related to poor aesthetic quality of water. Iron, Manganese, Turbidity. Can use up chlorine and shield micro-organisms from treatment processes.

10 Legislative requirements Health (Drinking-water) Amendment Act 2007 Water Supplier must take all reasonable steps to: Protect the source of drinking water Provide a wholesome water supply. Must take all practicable steps to: Comply with the Drinking-water Standards of New Zealand Must Prepare and Implement Water Safety Plans (formally Public Health Risk Management Plans)

11 Multi Barrier Approach surface water

12 Barriers on Groundwater/Spring Sources

13 Whangarei Water Supply Area Sources and Treatment

14 Whau Valley: Source Treatment & Distribution Barriers

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17 General Risks Contaminated Water Supply Always a concern but multi barrier approach should reduce likelihood Water Outages More likely, multi barrier can increase risk of outages Equipment failure/power outage/drought Critical customers Increased storage vs water quality

18 Risk Management It is always possible to put in place more barriers and add more redundancy to a system, thus reducing the risk of failure. However, this is not always practical or affordable. It is important to understand the level of risk associated with supplies. In order to standardize risk management within the water sector the Ministry of Health introduced a requirement for water suppliers to complete Water Safety Plans.

19 Water Safety Plans Formally Public Health Risk Management Plans Required for all Water Supply Areas Risks are assessed from Catchment through Treatment process and Distribution Network. Risks need to be addressed by Eliminating Often capital projects Minimising Process improvement Response Contingency planning

20 Emergency Response Chlorine Leak Breathing apparatus training

21 Havelock North The incident at Havelock North in August 2017 and the subsequent inquiry have highlight a number of issues within the water sector. In light of this many water suppliers around the country are reassessing their appetite for risk. Whilst a similar situation to Havelock North does not exist within Council s supplies, improvements are recommended to ensure we maintain compliance with best practice and maintain risks at a reasonable level.

22 Maungakaramea bore security

23 New Projects As a result of the latest Water Safety Plan reviews and in light of the Havelock North inquiry findings the following new projects are recommended for inclusion in the first three years of the new LTP. Ruddells WTP upgrade SCADA upgrade Fairway Drive Pump Station upgrade Whau Valley New WTP Improvements Site Security Improvements

24 Ruddells Water Treatment Plant Upgrade Possible Filter Risks - Increase in turbidity leads to ineffective treatment of Protozoa. (Beca Report March 2017) Recommendation - Installed filtration system Requirements - Additional land - Package plant - Increase opex costs Estimated Cost $1 million

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26 SCADA Upgrade SCADA and telemetry systems are critical to running modern process facilities. Our SCADA system is now over 12 years old, it uses old technology and old software. The programming is out of date. Risks - Old systems fail and compliance is lost or non potable water is produced - Increase in opex costs due to callouts and breakdowns, systems no longer supported by suppliers. Recommendation - Update SCADA system and radio telemetry network. Requirements - Strategic plan of SCADA system - Selection of preferred hardware, software, communications systems - Design, installation, programming and ongoing maintenance. Estimate Cost $1-$2million between Capex and Opex

27 SCADA screen - Ruddells

28 Fairway Drive Pump Station Upgrade Fairway Drive Pump Station supplies water to the Northern part of the City including Kamo, Tikipunga and Hikurangi. There are 3 pumps in the building. When one pump is down, 2 pumps cannot meet peak demands. All three pumps are old. Risks - One pump failure could lead to loss of water to North of City Recommendations - Upgrade all three pumps with new pumps of increased capacity Requirements - 3 new pumps and variable speed drives - Improve health and safety access to pump chamber - Upgrade transformer to cope with increase demand - Investigate emergency power generation requirements Estimated Cost $500,000

29 Fairway Drive Pump Station

30 New Whau Valley WTP upgrade The new Whau Valley WTP was originally designed to be similar to the existing plant. However, investigations and plant trials are indicating that improvements to the treatment processes are required to ensure ongoing compliance. Risks - Algal blooms become more frequent and require treatment - THM levels exceed 0.5 of MAV or standards increase - Iron and Manganese cause dirty water in network Recommendations - Add new processes to treat these issues Possible Requirements - Powder Activated Carbon to treat Algae and reduce THM levels - Second stage filtration for Iron and Manganese removal Estimated Cost $2 million

31 New Whau Valley Pilot Plant trails

32 Site Security Upgrade All water treatment plant and reservoir/pump station sites still have access via keys and padlocks. Fences are basic chain fencing and only two water treatment plants are alarmed (buildings only). Access to sensitive sites needs to be better controlled, particularly where dangerous chemicals are stored. Risks - Vandalism, theft and potentially sabotage of water supply. - Poor records of who is accessing sites, relies on signing in. Recommendations - Upgrade security system to modern electronic access where applicable align with SCADA system to improve efficiency. Requirements - Electronic Access for individuals, Alarm systems, CCTV Estimated Cost $500,000

33 Sargeants reservoir

34 Other potential new LTP Projects Renewals in conjunction with Roading Water Services work with Roading and NZTA to ensure mains are upgrade, where appropriate, during roading projects. This is for mains that would not be due under the prioritization/end of life model. Exact yearly funding to be confirmed in conjunction with Roading. Marsden Point Trunk Main This project will complete the new trunk main from the treatment plant to the Refinery. It will help reduce the risk of water outages to the refinery and also cater for growth in the Ruakaka One Tree Point Area. Estimate Cost $1.6million

35 Operational Risks Electrical/Mechanical Failure Current run to failure strategy needs reviewing Best for asset requires more proactive approach Combination of sensible renewal strategy and effective maintenance schedules Professional Support Increase in complexity, hardware and software (modelling) New standards and compliance, incl Health and Safety Technical advice and local support Combination of in house and outsourced Knowledge management Continuous Improvement and Ongoing Training Other Risks Backflow prevention Leak Detection Quality Control Operational budgets to be reviewed to include best for asset maintenance schedules and improved knowledge management.

36 H&S confined spaces training

37 Existing 2015 LTP projects

38 Whau Valley Dam Chimney drain upgrade Construction completed in 1969 holds 1.9 million cubic meters Chimney drain upgrade cost $2.6M

39 Whau Valley Dam

40 Watermain - breaks and performance issues Watermain renewals prioritised on based on poor performance Years 1-3 Years 4-10 total Leaks breaks & condition $6.5M $1.8M $8.3M Flow & pressure $5.3M $7.3M $12.6M Total for Poor Performance $11.8M $9.1M $20.9M 2015 LTP budget projected 2018 to 2028 $7.3M $25.8M $33.1M End of expected life $20.1M $19M $39.1M Output of Hansen Decision model and hydrant flow testing Prioritisation based on Number of breaks >5 in 3 years are planned for Y1-3 Condition rating of very poor planned Y4 onward Failed hydrant test replaced at end of expected life End of life mains without problems not expected to be replaced with projected budgets sweating the assets until performance issues arise

41 Aging Assets Water Asset groups % of Asset value Replace ment Current value Ave life remaining WATERMAINS ESTIMATED REMAINING LIFE WTP Assets 15% $51.8M 28.4M 55% Reservoirs 15% $52.3M $32.5M 62% Reticulation 68% $237.7M $118.4M 50% network Water meters 3% $10.1M $5.6M 56% Total $352M $185M 53% Data from 2014 AECOM revaluation % expected to stay the same Rider Distribution Trunk KMS <3 YEARS LIFE 4-10YEARS 10-30YEARS >30YEARS On average Water assets are half way through the expected life

42 Water mains break SH1 Northern Advocate, 4 th April 2017 page 3

43 AMP Capital Projects Years 1-3 LTP $26.8M Project Cost Date Driver Risk Whau Valley Chimney Drain $2.6M 2018/19 Not to current Stds High Ruddells WTP upgrade $1M 2018/19 Contamination risk Med SCADA upgrade $1M 2018/20 Control failure High Fairway Pump station upgrade $0.5M 2018/19 High demand Med New Whau Valley WTP 2nd stage $2M 2018/19 Disinfection byproducts Med Site security upgrade $0.5M 2019/20 Sabotage Med Reticulation renewals $11.8M 2018/21 Poor performance High Meter renewals $0.9M 2018/21 Lost revenue Med Station Rd trunk upgrade $0.8M 2019/20 Growth Totara Park Med Vinegar Hill trunk upgrade $1.4M 2020/21 Growth Tikipunga Med Three Mile Bush Reservoir $1.2M 2020/21 Growth 3 Mile bush Med Waipu trunk upgrade $0.8M 2020/21 Growth Waipu Med WTP equipment upgrades $1.3M 2018/21 Poor performance High Main renewals with Roading $0.6M 2018/21 Reduced cost Med Water tanker & filling sites $0.4M 2019/20 Emergency supply Low

44 AMP Capital Projects Years 4-10 LTP $58.3M Project Cost Date Driver Risk Dip Rd Reservoir $2.2M 2022/23 Capacity/growth Med Waipu Reservoir $1.3M 2023/24 Capacity/growth Med Maungakaramea Reservoir $0.6M 2024/25 Capacity/growth Low Ruakaka Reservoir $0.8M 2026/27 Capacity/growth Med Sargeants Reservoir & trunk $1M 2026/27 Capacity/growth Med Fairway Drive Reservoir $0.8M 2027/28 Capacity/growth Med Reticulation renewals $21.3M 2022/28 Condition & capacity High Meter renewals $2.4M 2018/21 Lost revenue Med Otaika to City trunkmain $4.4M 2022/25 Supply security Med Poroti trunkmain $1.4M 2022/24 Supply security Med Onerahi trunkmain $2.6M 2024/25 Supply security Med Marsden Point trunkmain $1.6M 2024/25 Supply security Med Mains with Roading $1.4M 2022/28 Reduced cost Med Wairua River Source/treatment- Poroti $13M 2024/27 Drought supply High WTP Equipment $3.5M 2022/28 Performance High

45 Dip Rd reservoir

46 AMP Opex Projects Years 1-10 LTP $15.8M Project Cost Date Driver Risk Reservoir Rehabilitation $2.2M 2018/28 Condition Med SCADA upgrade $1M 2018/20 Control failure High Pipe-bridge re-coating $60K 2018/22 Condition Low Engineering services $1M 2018/28 Projects High Media & UV replacements $2M 2018/28 Compliance High Professional services $1M 2018/28 Compliance Med Capital Project Opex $8.5M 2018/28 Prudence

47 Water Finances Where should we be heading? $20,000,000 Water Debt Profile (inflated) $15,000,000 $10,000,000 Closing balance Grey in credit Red in Debt $5,000,000 CAPEX spend inflated $0 -$5,000,000 -$10,000,000 -$15,000, TRIM 14/54728

48 Current Level of service Council will provide safe drinking water with adequate pressures to the residents of the District connected to the water supply system The water supply system is managed in a sustainable way and in times of emergency there is adequate water supply available We wish to change these? Involves: Simpler statements Additional customer response Consultation as part of LTP Status quo or more aspirational LoS and targets?

49 Proposed Level of Service changes 2018 Levels of Service - Water Our customers receive safe drinking water Water is supplied continuously with flow and pressure adequate for customers use Customer requests are responded to promptly In times of emergency there is water available We manage the water supply system in a sustainable way that also caters for growth New LoS statements Recommend: We change the wording & add in new LoS Leave the performance measures and targets as is for now. Mandatory measure not used for LoS. Are reported separately. Community Outcomes Early engagement planned this may effect LoS

50 Planning for Growth Current capacity maps (excess or below EES) Hydraulic Model recalibration Consent applications & Plan changes Development contributions Review of 30:50 projects & timing Water Master Plans (Network boundaries) Water demand forecasting & climate change

51 Climate Change Potential issues that may occur as a result of Climate Change Increase frequency of droughts, more severe Increase in demand More algal blooms More severe weather events causing flooding and damage to facilities Sea level rise may impact existing sources. The most immediate concern is the increase in frequency of Algal blooms. This may require some improvement in treatment process in the short term. Other impacts of climate change will need to be monitored and catered for in future LTPs

52 Fluoridation Bill currently going through Parliament Likely that DHBs will be given power to decide Estimated capital cost $1.5M to upgrade all WTPs Increase in Opex of approximately $100,000 per year Potentially some Government funding It is not proposed to make an allowance in this LTP for Fluoridation

53 Summary The focus of this LTP period for Water will be; Commitment to Protecting Public Health Ensuring compliance of all WTPs Reducing risk of failure SCADA and security Mechanical pumps and WTP equipment Reticulation watermains and trunk mains Whau Valley Dam Allowing for Growth - planned projects Improved Management Expertise professional services & operators Better condition assessment Legislative compliance, H&S Knowledge management These topics will be the main emphasis of the 2018 AMP

54 Any Questions?