Drinking Water Protection Act Implementation
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CITY OF POWELL RIVER DRINKING WATER PROTECTION ACT IMPLEMENTATION APRIL 2006 DAYTON & KNIGHT LTD. Consulting Engineers and WHITEHEAD ENVIRONMENTAL CONSULTANTS LTD. THIRD PARTY DISCLAIMER AND COPYRIGHT This document has been prepared by Dayton & Knight Ltd. for the benefit of the client to whom it is addressed. The information contained in this document represents Dayton & Knight Ltd.’s best professional judgement in light of the knowledge and information available to Dayton & Knight Ltd. at the time of its preparation. Except as required by law, this document is to be treated as confidential and may be used and relied upon only by the client, its officers and employees. Dayton & Knight Ltd. denies any liability whatsoever to other parties who may obtain access to this document for any injury, loss or damage suffered by such parties arising from their use of, or reliance upon, the document or any of its contents without the express written consent of Dayton & Knight Ltd. and the client. This document is for the sole use of the addressee and Dayton & Knight Ltd. This 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 Dayton & Knight Ltd. Information in this document is to be considered the intellectual property of Dayton & Knight Ltd. in accordance with Canadian Copyright Law. CITY OF POWELL RIVER DRINKING WATER PROTECTION ACT IMPLEMENTATION TABLE OF CONTENTS TITLE PAGE LETTER OF TRANSMITTAL TABLE OF CONTENTS 1.0 EXECUTIVE SUMMARY ............................................................................................. 1-1 2.0 INTRODUCTION ........................................................................................................... 2-1 2.1 Background.......................................................................................................... 2-1 2.2 Existing Water System......................................................................................... 2-1 2.3 Conduct of Study ................................................................................................. 2-4 2.4 Acknowledgements.............................................................................................. 2-5 3.0 ASSESSMENT OF FACILITIES.................................................................................... 3-1 3.1 Introduction.......................................................................................................... 3-1 3.2 Method of Survey ................................................................................................ 3-1 3.3 Results and Discussion ........................................................................................ 3-3 3.4 Action Plan........................................................................................................... 3-6 4.0 MAINTENANCE PROCEDURES REVIEW................................................................. 4-1 4.1 Introduction.......................................................................................................... 4-1 4.2 Method of Survey ................................................................................................ 4-1 4.3 Results and Discussion ........................................................................................ 4-3 4.4 Maintenance Surveys........................................................................................... 4-4 4.4.1 Hydrants................................................................................................... 4-9 4.4.2 Main Flushing/Cleaning........................................................................... 4-9 4.4.3 Pumps..................................................................................................... 4-11 4.4.4 PRV Stations.......................................................................................... 4-12 4.4.5 Chlorination Systems............................................................................. 4-12 4.4.6 Valves .................................................................................................... 4-14 4.4.7 Facility Inspections ................................................................................ 4-15 4.4.8 Water Testing Program.......................................................................... 4-16 4.4.9 Cross Connection Control Program....................................................... 4-18 213.20 ©2005 Dayton & Knight Ltd. Page i 4.4.10 Daily/Weekly/Monthly Data Collection................................................ 4-20 4.4.11 SCADA.................................................................................................. 4-21 4.5 Action Plan......................................................................................................... 4-25 4.6 Conclusions and Recommendations .................................................................. 4-26 5.0 TREATMENT PLAN...................................................................................................... 5-1 5.1 Introduction.......................................................................................................... 5-1 5.2 Method of Assessment......................................................................................... 5-2 5.3 Results and Discussion ........................................................................................ 5-3 5.3.1 Locations for Source Water Testing ........................................................ 5-3 5.3.2 Test Plan and Parameters......................................................................... 5-3 5.3.3 Estimated C·t Values................................................................................ 5-5 5.3.4 Haslam Lake Water Treatment Upgrade ................................................. 5-6 5.3.5 Powell Lake Treatment Upgrade ............................................................. 5-7 5.3.6 Supply Redundancy ................................................................................. 5-7 5.4 Cost Estimate ....................................................................................................... 5-8 5.5 Action Plan........................................................................................................... 5-8 5.6 Conclusions and Recommendations .................................................................... 5-9 6.0 MONITORING OF WATER SOURCES ....................................................................... 6-1 6.1 Introduction.......................................................................................................... 6-1 6.2 Review of Water Quality Results ........................................................................ 6-1 6.3 Results.................................................................................................................. 6-2 6.3.1 Source Water Quality............................................................................... 6-2 6.3.2 On-line Turbidity Monitoring.................................................................. 6-5 6.3.3 Chlorine Residuals................................................................................... 6-6 6.4 Action Plan........................................................................................................... 6-9 6.5 Conclusions and Recommendations .................................................................. 6-10 7.0 EMERGENCY RESPONSE PLAN ................................................................................ 7-1 7.1 Introduction.......................................................................................................... 7-1 7.2 Existing Emergency Water Plan .......................................................................... 7-1 7.3 Discussion............................................................................................................ 7-2 7.4 Potential Emergency Situations ........................................................................... 7-4 7.4.1 Power Failure........................................................................................... 7-4 7.4.2 Loss of Source.......................................................................................... 7-5 7.4.3 Loss of Transmission Main...................................................................... 7-6 7.4.4 Response to Positive Bacteriological Results.......................................... 7-7 7.4.5 Failure of the Chlorination System.......................................................... 7-8 7.4.6 Response to Contamination of Source and/or Storage Reservoir.......... 7-10 7.4.7 Unauthorized Access to Intake, Control Buildings or Storage Reservoir................................................................................................ 7-10 7.4.8 Response to Water Quality Events ........................................................ 7-11 TABLE OF CONTENTS (cont’d.) 7.4.9 Response to Earthquake......................................................................... 7-12 7.4.10 Response to Chlorine Leak .................................................................... 7-13 7.4.11 Response to Fire in the Watershed......................................................... 7-14 8.0 HASLAM LAKE WATERSHED ASSESSMENT (by Whitehead Environmental Consultants Ltd.).............................................................................................................. 8-1 8.1 Introduction.........................................................................................................