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Master Water Plan-Oct 2017

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Master Water Plan-Oct 2017 REPORT District of Lillooet Master Water Plan Update October 2017 CONFIDENTIALITY AND © COPYRIGHT This document is for the sole use of the addressee and Associated Engineering (B.C.) Ltd. The document contains proprietary and confidential information that shall not be reproduced in any manner or disclosed to or discussed with any other parties without the express written permission of Associated Engineering (B.C.) Ltd. Information in this document is to be considered the intellectual property of Associated Engineering (B.C.) Ltd. in accordance with Canadian copyright law. This report was prepared by Associated Engineering (B.C.) Ltd. for the account of District of Lillooet. The material in it reflects Associated Engineering (B.C.) Ltd.’s best judgement, in the light of the information available to it, at the time of preparation. Any use which a third party makes of this report, or any reliance on or decisions to be made based on it, are the responsibility of such third parties. Associated Engineering (B.C.) Ltd. accepts no responsibility for damages, if any, suffered by any third party as a result of decisions made or actions based on this report. Table of Contents Table of Contents SECTION PAGE NO. Table of Contents i 1 Introduction 1-1 1.1 General 1-1 1.2 Rationale of the 2017 Master Water Plan 1-1 1.3 Level of Service Expectations 1-2 2 Existing Water System 2-1 2.1 Current Supply 2-1 2.2 Design Criteria 2-1 3 Demand Patterns 3-1 3.1 Population 3-1 3.2 Water Consumption Patterns 3-2 4 Water Quality 4-1 4.1 Seton Creek Intake 4-1 4.2 Water Quality Testing - Current Practices 4-1 5 Water Supply and Distribution 5-1 5.1 General Overview 5-1 5.2 Observations with Current Infrastructure 5-2 6 Water Conservation 6-1 6.1 Observations about Water Consumption in Lillooet 6-1 7 Hydraulic Analysis 7-1 7.1 Water Modelling Parameters 7-1 7.2 Fire Flow Modelling 7-1 7.3 Modelling Results and Discussion 7-2 8 Capital Works 8-1 8.1 Dickey Creek Upgrades 8-1 8.2 PRV Replacement Program 8-2 8.3 Backup Power Generation Program 8-4 8.4 Mainline Upgrades and Asset Replacement 8-4 9 Financials 9-1 10 Conclusions and Recommendations 10-1 i District of Lillooet References Appendix A - Technical Memorandum - Design Criteria Appendix B – Detailed Cost Tables Appendix C - FUTURE SOUTH LILLOOET WATER SYSTEM Water Supply and Treatment Options 1 Water Storage and Distribution 1 Order of Magnitude Cost Estimates 2 Discussion and Summary 4 Appendix D - Future East Lillooet Service Area Existing and Future Water Demand 1 Water Supply and Treatment Options 2 Water Storage and Distribution 3 Appendix E - District Operations Report (2016) ii \\s-kel-fs-01\projects\20162354\00_wmp_smp_updates\engineering\03.02_conceptual_feasibility_master_plan_report\final wmp_august 2017\rpt_lillooetwmp__20171109.docx REPORT 1 Introduction 1.1 GENERAL The purpose of this document is to update the District of Lillooet Master Water Plan. The previous plan developed by True Engineering in 2008 resulted in the construction of the Cayoosh Creek Water Treatment Plant, replacement of a new reservoir, a series of mainline upgrades and new pump stations. The focus of the document is described in the following scope provided by the District: · Update the Master Water Plan by incorporating current standards to confirm or update system hydraulics, system capacities, water and wastewater treatment capacities, water availability, and water quality. · Review existing infrastructure condition and performance taking into account the District’s projected growth rates and economic analysis parameters to the 10-year horizon. Additional projects will be outlined to 20 years. · Identify any new capital projects that may be required and provide costs and any possible impact on user fees. · Prepare water modelling for use in assessing future subdivision and development impacts on the District’s water infrastructure. Provide water infrastructure databases and mapping that are at an accuracy that is sufficient to perform water modelling and conduct detailed asset management planning. 1.2 RATIONALE OF THE 2017 MASTER WATER PLAN The intention of a Master Water Plan is to provide a sustainable capital plan that assures the community water system is capable of delivering potable water that meets Canadian Drinking Water Quality Guidelines at a reasonable pressure, and that the system can accommodate future development and growth without impacting system hydraulics or increasing costs. For this plan to be effective, it must be accepted both by the Community and vetted by District staff. An effective plan must be sustainable, providing guidance to coordinate work with other infrastructure spending for such assets such as roads, sanitary, storm, electrical, buildings or provincial works. From a practical perspective, an effective plan reduces surprise costs, and sets a reasonable path forward. To maintain plan relevancy, it is important to review and update plan details every 3 to 5 years. From a financial and sustainability perspective, the District of Lillooet water connection and regulations bylaw has determined the rate structure till 2023, and now include the long-term payment of the new water treatment facility, storage and pumping facilities. To maximize the use of these facilities, the distribution system must now be upgraded to meet the standards expected for each resident and business, including providing potable water at adequate pressure and expected fire flow capacity under the most stressful conditions (which in this case is defined as Maximum Day Demand (MDD). There is an expectation from the Community that a reasonable water rate structure will provide these services. 1-1 District of Lillooet The focus of this plan over the next 10 years is on resiliency. Infrastructure resiliency can be defined in many ways, however generally it is the ability to reduce the magnitude and/or duration of disruptive events. A fully resilient system considers four key abilities (USDHS, 2010): · Robustness—the ability to absorb shocks and continue operating; · Resourcefulness—the ability to skillfully manage a crisis as it unfolds; · Rapid Recovery—the ability to get services back as quickly as possible; and · Adaptability—the ability to incorporate lessons learned from past events to improve. District of Lillooet operations staff have dealt with resiliency issues for years. They must be directed now to eliminate known risks, and provide added consideration for protection or backup supplies where possible. The establishment of this long-term source has reduced or eliminated the need for other traditional creek sources used by the District. This offers the opportunity, over time, to replace or eliminate older high mainlines in some areas and improve capacity and reliability and supply in others. There is still a need for a reliable backup supply, however, should the treatment plant shut down for an extended period. A treated Dickey Creek gravity water source could still be used to supply the town in the event of a break down from below. Resiliency improvements in Lillooet should also consider: · Backup power generation to operate the Recreation Wells during a prolonged power failure, · Backup power generation for booster station used to fill reservoirs, · A backup gravity water supply should Seton pumping or water source quality be compromised. · Potential failure of Asbestos Cement mainlines. · Potential for additional fire fighting capacity. · Backup supplies for all chemicals and filtration units in the WTP. It is impossible to prevent or mitigate all failures. This plan discusses the issues and assists in determining the most effective measures for mitigating results from different failures. This includes future impacts due to climate change. 1.3 LEVEL OF SERVICE EXPECTATIONS Background information was obtained from various District of Lillooet Strategic planning documents and studies. On November 6th and 7th, 2015, Council of the District of Lillooet met to establish its agenda and priorities for the remainder of its term. Discussion of Council’s priorities identified four key Goals (From: Level of Service Presentation to Council - District of Lillooet Goals and Objectives – 2016-2018): · Improve Corporate Governance · Build Community · Develop Financial Sustainability · Advance Environmental Responsibility 1-2 \\s-kel-fs-01\projects\20162354\00_wmp_smp_updates\engineering\03.02_conceptual_feasibility_master_plan_report\final wmp_august 2017\rpt_lillooetwmp__20171109.docx 1 - Introduction Strategies were developed under the Financial Sustainability Focus, and were used as part of the criteria for this water master plan decision making process from both an immediate and a long-term perspective. This include understand the goals of: · Developing an equitable and self-funding water rate structure by: · Amalgamating parcel/frontage tax systems to a single local service area tax, · Completing the water metering process, · Experiencing water system expenditures for full year. · Budgeting sufficient resources to operation and maintain water, sewer and transportation services Council/CFO/Director Works · Support strengthening of agricultural industry by working with the regional “agricultural committee” and T’it’q’et’s agricultural enterprises. 1-3 REPORT 2 Existing Water System 2.1 CURRENT SUPPLY The District of Lillooet currently provides water to a population of 2350 people. The distribution system provides water to six pressure zones, servicing residential, commercial and industrial areas in both the downtown
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