Water Intake, Treatment Plant, and Supply Mains
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Final Predesign Report Water Intake, Treatment Plant, and Supply Mains Prepared for Englishman River Water Service June 5, 2014 Metrotower II – Suite 2100 4720 Kingsway Burnaby, BC V5H 4N2 COPYRIGHT 2014 BY CH2M HILL CANADA LIMITED ALL RIGHTS RESERVED COMPANY CONFIDENTIAL Consultant Team The Predesign Report for the Englishman River Water Service – Intake, Water Treatment Plant and Transmission Mains project was prepared by a multi‐disciplinary team led by CH2M HILL. Justin Cheng, P.Eng. Sarah Morse, P.Eng. Process Mechanical/ Geotechnical Coordinating Registered Professional Golder CH2M HILL Eric Morris, P.Eng. R. Greg Smith, P.Eng. Civil Structural Kerr Wood Leidal CH2M HILL Wendell Thiessen, P.Eng. Duc Le, P.Eng. Electrical, Instrumentation Building Mechanical and Controls CH2M HILL CH2M HILL WBG042714205154VBC COPYRIGHT 2014 BY CH2M HILL CANADA LIMITED ALL RIGHTS RESERVED COMPANY CONFIDENTIAL CH2M HILL Metrotower II – Suite 2100 4720 Kingsway Burnaby, BC V5H 4N2 Canada Tel 604.684.3282 Fax 604.684.3292 June 5, 2014 476148/WBG042714205154VBC Mr. Mike Squire, ASc.T. Program Manager Englishman River Water Service PO Box 1116 Parksville, BC V9P 2H3 Subject: Water Intake, Treatment Plant, and Supply Mains Final Predesign Report Dear Mr. Squire: We are pleased to submit our final predesign report for the water intake, treatment plant, and transmission mains project. The comments provided by the Englishman River Water Service on May 27, 2014 have been incorporated in the final version of the report. Sincerely, CH2M HILL Canada Limited Paul Wobma, P.Eng. Vice President COPYRIGHT 2014 BY CH2M HILL CANADA LIMITED • ALL RIGHTS RESERVED • COMPANY CONFIDENTIAL Contents Section Page Acronyms and Abbreviations ..................................................................................................................... ix 1. Introduction ............................................................................................................................... 1‐1 1.1 Background ............................................................................................................................ 1‐1 1.2 Scope of Work ........................................................................................................................ 1‐1 1.3 Approach ................................................................................................................................ 1‐2 1.3.1 Project Initiation ....................................................................................................... 1‐2 1.3.2 Public Involvement ................................................................................................... 1‐2 1.4 References ............................................................................................................................. 1‐3 2. Design Flows ............................................................................................................................... 2‐1 2.1 Water Demand ....................................................................................................................... 2‐1 2.2 Water Treatment Plant Capacity ........................................................................................... 2‐2 2.3 Phasing ................................................................................................................................... 2‐3 3. Regulatory Requirements ........................................................................................................... 3‐1 3.1 Water License ........................................................................................................................ 3‐1 3.2 Vancouver Island Health Authority ........................................................................................ 3‐1 3.3 Water Quality Regulations ..................................................................................................... 3‐1 3.3.1 Guidelines for Canadian Drinking Water Quality ...................................................... 3‐1 3.3.2 Other Requirements ................................................................................................. 3‐1 4. Water Quality and Treatment Requirements .............................................................................. 4‐1 4.1 Raw Water Quality ................................................................................................................. 4‐1 4.2 Treatment Requirements and Performance Objectives ........................................................ 4‐2 4.3 Treatment Process Options ................................................................................................... 4‐3 4.3.1 Option 1A .................................................................................................................. 4‐4 4.3.2 Option 2 .................................................................................................................... 4‐4 4.3.3 Treatability Testing and Cost Estimates .................................................................... 4‐4 4.4 Recommended Treatment Option ......................................................................................... 4‐4 5. Process Narrative ....................................................................................................................... 5‐1 5.1 Overview ................................................................................................................................ 5‐1 5.2 Intake and Raw Water Pump Station ..................................................................................... 5‐1 5.2.1 Obermeyer Weir ....................................................................................................... 5‐1 5.2.2 Intake Structure ........................................................................................................ 5‐2 5.2.3 Raw Water Pump Station .......................................................................................... 5‐2 5.3 Sand Separators and Fine Strainers ....................................................................................... 5‐3 5.4 Feedwater Coagulation Addition ........................................................................................... 5‐3 5.5 Microfiltration/Ultrafiltration System ................................................................................... 5‐3 5.5.1 Feed Pumps............................................................................................................... 5‐3 5.5.2 Membranes and Membrane Assembly .................................................................... 5‐3 5.5.3 Membrane Integrity Test System ............................................................................. 5‐4 5.5.4 Backwash System ...................................................................................................... 5‐4 5.5.5 CEB/CIP System ......................................................................................................... 5‐4 5.6 Disinfection ............................................................................................................................ 5‐5 5.6.1 UV Disinfection ......................................................................................................... 5‐5 5.6.2 Chlorination .............................................................................................................. 5‐6 WBG042714205154VBC iii COPYRIGHT 2014 BY CH2M HILL CANADA LIMITED ALL RIGHTS RESERVED COMPANY CONFIDENTIAL CONTENTS, CONTINUED 5.7 Corrosion Control ................................................................................................................... 5‐6 5.8 Finished Water Pump Station ................................................................................................. 5‐6 5.9 Ancillary Systems .................................................................................................................... 5‐6 5.9.1 Rainwater Collection ................................................................................................. 5‐6 5.9.2 Chemical Containment .............................................................................................. 5‐6 6. Process Design ............................................................................................................................ 6‐1 6.1 Overview................................................................................................................................. 6‐1 6.1.1 Flow Considerations .................................................................................................. 6‐1 6.1.2 Process Considerations ............................................................................................. 6‐2 6.2 Intake and Raw Water Pump Station ..................................................................................... 6‐3 6.2.1 Obermeyer Weir ........................................................................................................ 6‐3 6.2.2 Intake Structure ......................................................................................................... 6‐3 6.2.3 Raw Water Pump Station .......................................................................................... 6‐3 6.3 Sand Separators and Fine Strainers ....................................................................................... 6‐4 6.4 Feedwater Coagulant Addition .............................................................................................. 6‐5 6.5 Microfiltration/Ultrafiltration