AWWA 20659-2009 Distribution Systems Operation and Management Operational Guide to AWWA Standard G200.pdf

1、 Blank PageG200Operational Guide to A WW A Standard G200 Distribution Systems Operation and Management Copyright 2009 American Water Works Association All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, elec- tronic or mechanical, including

2、photocopy, recording, or any information or retrieval system, except in the form of brief excerpts or quotations for review purposes, without the written permission of the publisher. Disclaimer The authors, contributors, editors, and publisher do not assume responsibility for the validity of the con

3、tent or any consequences of their use. In no event will AWWA be liable for direct, indirect, special, incidental, or consequential damages arising out of the use of information presented in this book. In particular, AWWA will not be responsible for any costs, including, but not limited to, those inc

4、urred as a result of lost revenue. In no event shall AWWAs liability exceed the amount paid for the purchase of this book. Project Manager: Gay Porter DeNileon Production: Glacier Publishing Services, Inc. Library of Congress Cataloging-in-Publication Data Oberoi, Kanwal.Operational guide to AWWA st

5、andard G200 : distribution systems operation and management / by Kanwal Oberoi.p. cm.Includes bibliographical references.ISBN 978-1-58321-734-4 1. Water-Distribution-Standards-United States. 2. Water utilities-Management-Standards-United States. I. Title. TD481.O24 2009 628.144021873-dc222009015705

6、Printed in the United States of America American Water Works Association 6666 West Quincy Ave. Denver, CO 80235iii Contents SECTION 1: ACKNOWLEDGMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SECTION 2: FOREWORD . . . . . . . . . . . . . . . . . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SECTION 3: INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SECTION 4: REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、 . . . . . . . . . . . . . . . . . . . 4 Sec. 4.1 W ater Quality, 4 4.1.1 Compliance With Regulatory Requirements, 4 4.1.2 Monitoring and Control, 6 4.1.3 Disinfectant Residual Maintenance, 9 4.1.4 Additional Requirements for Utilities Not Utilizing a Disinfectant Residual, 15 4.1.5 Internal Corrosi

9、on Monitoring and Control, 16 4.1.6 Aesthetic W ater Quality Parameters, 19 4.1.7 Customer Relations, 23 4.1.8 System Flushing, 26 Sec. 4.2 Distribution System Management Programs, 30 4.2.1 System Pressure, 30 4.2.2 Backflow Prevention, 33 4.2.3 Permeation Prevention, 37 4.2.4 W ater Losses, 39 4.2.

10、5 V alve Exercising and Replacement, 43 4.2.6 Fire Hydrant Maintenance and T esting, 46 4.2.7 Materials in Contact With Potable W ater, 49 4.2.8 Metering, 50 4.2.9 Flow, 54 4.2.10 External Corrosion, 59 4.2.11 Design Review for W ater Quality, 62 4.2.12 Energy Management, 66 Sec. 4.3 Facility Operat

11、ions and Maintenance, 71 4.3.1 T reated W ater Storage Facilities, 71 4.3.2 Pump Station Operations and Maintenance, 74 4.3.3 Pipeline Rehabilitation and Replacement, 77 4.3.4 Disinfection of New or Repaired Pipes, 84iv Operational Guide to AWWA Standard G200 SECTION 5: VERIFICA TION . . . . . . . .

12、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Sec. 5.1 Documentation Required, 86 5.1.1 General, 87 5.1.2 Examples of Documentation, 91 5.1.3 Control of Documents, 94 5.1.4 Control of Records, 99 Sec. 5.2 Human Resources, 101 5.2.1 General, 101 5.2.2 C

13、ompetence, Awareness, and T raining, 105 SECTION 6: REFERENCES AND RESOURCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 SECTION 7: AUDIT CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1091 G200 Operational Guide SE

14、CTION 1: ACKNOWLEDGMENTS Special thanks are extended to Jaala Draper who provided the technical review for this publication. Also appreciation is extended to Jane Byrne, Patricia Moore, and Kevin Whitsett for their contributions. Thank you, too, to the committees and volunteers that helped conceive

15、the framework and develop the series of standards that led to the creation of this guidebook, particularly Eva Nieminski, Jim Ginley, and T odd Humphrey for their reviews and passion for excellence in water quality and operations. SECTION 2: FOREWORD This operationial guide has been written as a gui

16、dance tool for the imple- mentation of water distribution systems operation and management (O therefore, identify which part of the utility will perform this review in the column titled: Responsibility for Current Version. Establish elec- tronic links in the column titled: Document Format/Location.

17、This ensures that the most current requirements are available for reference. With hard-copy require- ments, list the location(s) of the hard-copy. All utility departments are required to ensure that regulatory and other requirements are interpreted and applied to their operations. Those listed as “R

18、esponsible” are required to periodically ensure that the most recent legal and other requirements are identified and listed. Note: This form may be replicated on a computer or duplicated on a photocopier. The computer copy must look similar to this document and contain the same information. Question

19、s to Check Progress 1. Does the utility have an established list of updated legal and regulatory requirements? 2. Has the utility communicated this information to all the stakeholders and established systems to periodically review and update this form? 3. Has the utility established programs to ensu

20、re regulatory requirements are adhered to? 4. Has the utility established a system of monitoring to ensure compliance to the legal and regulatory requirements and to ensure water quality in the distribution system? 6 Operational Guide to AWWA Standard G200 4.1.2 Monitoring and Control 4.1.2.1 Sampli

21、ng plan. The utility shall establish a routine distribution system sampling plan that is representative of the entire distribution system. The sampling plan shall be reviewed annually and adjustments made based on historical data trends, changes in water use patterns, or other changes that may affec

22、t water quality. The utility shall analyze data trends and have an action plan to respond to changes. 4.1.2.2 Sample sites. Sample sites shall include, at a minimum, sites required for regula- tory compliance monitoring. Additional sites shall be sampled as necessary to provide a complete picture of

23、 water quality in the system. The utility shall use sampling sites that are representative of all known distribution system conditions, including the following: variations in hydraulic detention time, pipeline materi- als, where booster disinfection is applied, where water is stored, and where water

24、 quality deterioration (e.g., loss of disinfectant residual and increased microbial growth) is known, or suspected, to occur. Samples shall include locations that represent the longest detention time in the system, dead-end locations, areas of low circulation, and finished water storage facilities.

25、Locations where problems have occurred in the past require more frequent sampling. 4.1.2.3 Sample collection. Samples shall be collected in accordance with Standard Meth- ods for the Examination of Water and Wastewater. Chain of custody forms shall be used throughout the sampling process in accordan

26、ce with Standard Methods for the Examination of Water and Wastewater or regulatory requirements. Both sample collectors and the laboratory shall use standardized labels and forms. 4.1.2.4 Sample taps. Sample taps shall be protected from outside sources of contamina- tion. The integrity of the sample

27、 taps shall be evaluated annually to correct leaks or other potential sources of contamination. Rationale Water quality monitoring in the distribution system provides information on water quality conditions between the entry point to the system and the cus- tomers tap. It guides the utility in makin

28、g changes in operations, maintenance, or treatment to improve overall water quality before water reaches the customer. The most common monitoring parameters used for distribution system water qual- ity include coliform bacteria; chlorine residual; heterotrophic plate count (HPC) bacteria; pH; turbidity; disinfection by-products (DBPs); color, taste and odor; pressure; and water temperature.