Wastewater Activity Management Plan 2021-2051 Quality Assurance Statement Version: March 2021 Tasman District Council Status: Draft for Consultation 189 Queens Street Private Bag 4 Project Manager: Jenna Neame Richmond 7050 Telephone: (03) 543 8400 Prepared by: Fax: (03) 5439524 AMP Author Helen Lane Approved for issue by: Engineering Manager Richard Kirby PAGE 2 WASTEWATER ACTIVITY MANAGEMENT PLAN Contents 1 Executive Summary ...................................................................................................... 4 2 Introduction ................................................................................................................. 13 3 Strategic Direction ....................................................................................................... 25 4 Key Linkages ............................................................................................................... 40 5 Levels of Service .......................................................................................................... 50 6 Our Partners, Customers and Stakeholders ................................................................ 60 7 Current and Future Demand ........................................................................................ 63 8 Lifecycle Management ............................................................................................... 69 9 Financials .................................................................................................................... 84 10 Sustainability .............................................................................................................. 96 11 Risk Management and Assumptions .......................................................................... 103 12 Asset Management Processes and Practices ............................................................. 113 13 Improvement Planning .............................................................................................. 125 Appendix A: Detailed Operating Budgets .......................................................................... 130 Appendix B: Detailed Capital Budgets ............................................................................... 133 Appendix C: Wastewater Network Schematics .................................................................. 139 PAGE 3 WASTEWATER ACTIVITY MANAGEMENT PLAN 1 Executive Summary 1.1 What We Do We provide and manage wastewater collection, treatment, and disposal facilities for our residents connected to our eight wastewater networks. These networks convey wastewater to eight treatment plants, seven of which we own and manage. The largest treatment plant (at Bell Island) is owned by both Nelson and Tasman Councils on a 50:50 share basis and is managed by the Nelson Regional Sewerage Business Unit. We own and operate eight wastewater networks and manage associated infrastructure. Networks include: Collingwood Motueka, Riwaka and Kaiteriteri Murchison, St. Arnaud, Tākaka, Pohara, Ligar Bay and Tata Beach Tapawera Upper Tākaka Waimea including Richmond, Hope, Brightwater, Wakefield and Māpua/Ruby Bay Below is an overview of the key components of the wastewater activity. PAGE 4 WASTEWATER ACTIVITY MANAGEMENT PLAN 1.2 Why We Do It Activity Goal We aim to provide cost-effective and sustainable wastewater systems to protect public health whilst meeting environmental standards. The provision of wastewater services is a core public health function of local government. We promote and protect public health, community well-being, and our environment within our District by planning, implementing, and maintaining our wastewater services. This is one of our key duties as required by the Health Act 1956. 1.3 Levels of Service The Council aims to provide the following levels of service for the Wastewater activity: “Our wastewater systems do not adversely affect the “Our wastewater systems “Our wastewater systems receiving environment.” reliably take out wastewater are built, operated and with a minimum of odours, maintained so that failures “Our wastewater activities overflows or disturbance to can be managed and are managed at a level that the public.” responded to quickly.” satisfies the community.” PAGE 5 WASTEWATER ACTIVITY MANAGEMENT PLAN We will invest in increasing network capacity to assist in preventing overflows so that they do not adversely affect the environment. Major pump station and rising main upgrades will help mitigate overflows, particularly in Mapua and Pohara. These upgrades should improve our performance against our agreed level of service. We are also planning to mitigate overflows in Richmond through addressing inflow and infiltration issues. 1.4 Key Issues The most important issues relating to this activity and how the Council is planning to respond are summarised in the Table below. Table 1: Key Issues Key issue The Council Response Ground and rainwater in the network Invest in building hydraulic network models; Install pipe flow meters and level sensors in Ground and rainwater entering the network is storage chambers; a significant issue in some settlements. Heavy or prolonged rainfall can overload our pipe Invest in ongoing CCTV programme; networks and wastewater treatment plants. Invest in ongoing inflow and infiltration In turn, this restricts residential and programme; commercial growth because it uses up Refine pipe renewal programme; available network capacity. We then pump, Install low pressure pumped systems where convey and treat the extra water, resulting in appropriate; additional and unnecessary costs. Excessive levels may also dilute wastewater and lower Install emergency storage at key pump stations; the performance of our treatment plants. Continue to collect asset condition data to refine investment decisions; Providing infrastructure to allow for new New bypass pump station with emergency homes and businesses storage in Brightwater (Lord Rutherford); We expect that over the next 10 years, our New rising main and pump station at Motueka population will grow by approximately 7,700 West; residents. To accommodate this growth, new New rising main and pump station at Richmond houses will need to be built, most of which South; will need to be supplied with wastewater. We Staged upgrades to trunk main between can supply some of this new demand where Wakefield and Three Brothers Corner; there is capacity in our existing infrastructure. Upgrades to existing pump stations in Mapua; Where capacity is not available, or if the Upgrades to existing pump stations and rising infrastructure does not exist, we will need to provide upgraded or new infrastructure to main in Richmond (Headingly Lane); enable growth. Upgrades to existing pump stations and rising main in Tarakohe and Pohara, Investment contribution to NRSBU for additional capacity; PAGE 6 WASTEWATER ACTIVITY MANAGEMENT PLAN Key issue The Council Response Climate Change and Resilience New inland wastewater treatment plant for The investment required to ensure our Motueka; infrastructure can withstand the effects of New mobile generators; climate change and natural hazard shock Energy efficiency initiatives - installing a solar events will be significant. PV array on wastewater assets. We plan to invest in emergency storage and standby power generation to ensure wastewater services can continue operating in the future and are adaptable to change. Sea level rise means some coastal wastewater infrastructure will become increasing vulnerable to inundation e.g. the Motueka Wastewater Treatment Plant. Three Waters Reform and new regulation. Dialogue with MOU-NCC neighbors about change. The government’s comprehensive reform of The Council plan to work more closely with the Three Waters sector has prompted new iwi/mana whenua partners to: legislation (Taumata Arowai–the Water Services Regulator Act 2020), with more o Seek guidance on how to give effect to expected in 2021 (Water Services Bill). Te Mana o te Wai; o Understand, support, and seek advice The three waters reforms involve regulatory and service delivery reform, both of which are on how to enable the exercise of mātauranga Māori and tikanga Māori essential for addressing a range of issues and and kaitiakitanga; opportunities, including infrastructure investment requirements; funding, o Ensure that wastewater discharges do affordability, capability and capacity not adversely affect cultural values and challenges; water security; and issues practices. highlighted by the Inquiry into Havelock North Drinking Water. Some of the government’s post Covid-19 stimulus funding to improve and maintain three waters infrastructure will go towards emergency storage and energy improvements for the wastewater activity. In September 2020, the National Policy Statement for Freshwater Management and the National Environmental Standards for Freshwater came into force, providing direction and requirements for the Councils to improve freshwater management under the Resource Management Act 1991. PAGE 7 WASTEWATER ACTIVITY MANAGEMENT PLAN Key issue The Council Response Both the NPS and new water legislation requires the Council to give effect to Te Mana o te Wai. It is important in Māori culture to avoid contamination of water with wastewater (both treated and untreated). Treated wastewater is frequently discharged into, or nearby to, coastal and river environments. In the future, it is likely that we will have to improve treatment processes and the tolerance for wastewater overflows