Good Engineering Practice for Northern Water and Sewer Systems

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ACKNOWLEDGEMENTS In preparing Good Engineering Practice for Northern Water and Sewer Systems (First Edition), the Department of Public Works and Services has drawn upon the assistance of numerous individuals from within the Department and from engineers and technical specialists in the private sector. Many of them contributed technical writing and comments to this guidebook. Good Engineering Practice for Northern Water and Sewer Systems became a reality because of their participation, and I hope this kind of shared learning experience and cooperative effort can continue during the production of the second edition. Special acknowledgements are due to staff in the Department of Public Works and Services’ Water and Sanitation Section: Kim Philip, Senior Engineer; Vincent Tam, Senior Engineer; Olivia Lee, Water and Sanitation Intern Engineer; and Loretta Ransom, Water Quality and Environmental Specialist. Many thanks are expressed to Rob Given, Policy Officer, for project coordination and editorial assistance, and to John Dick for consolidating the sections of the guidebook and producing it in its current form. We also thank Richard Cracknell, Senior Mechanical Technical Officer and Laurie Holmes, Sr. Administrator. Thanks are also extended to Artur Zajdler, Facility Planner, for his assistance in designing the cover. Finally, our appreciation is extended to Sukhi Cheema, Manager, Technical Support Services, who initiated and coordinated the overall production of this guidebook. Joe Auge Director Asset Management Division Department of Public Works and Services
PREAMBLE Introduction The Good Engineering Practice for Northern Water and Sewer Systems (GEP) guidebook contains performance guidelines, preferred materials and methods, and logistical considerations for the design and construction of northern water and sewer systems. Over time, certain products and approaches to constructing water and sewer systems have proven successful and have been adopted by design consultants and builders working in the NWT. It is hoped that your comments and opinions will lead to further revisions and additions that will keep the guidebook current and relevant. Criteria for Good Engineering Practice These technical guidelines are not intended to supplant mandatory codes or regulations, but to supplement those contained in the Cold Climate Utilities Monograph, National Building Code of Canada, the NWT Public Health Act, the NWT Public Water Supply Regulations, the NWT Public Sewage System Regulations, the standards and guidelines recommended by the American Water Works Association, and those in the local municipality’s bylaws. The guidelines are recommended where the GNWT believes that: • more stringent requirements should be applied relative to those of the National Building Code, local municipality, etc.; • there is a need to augment or clarify code requirements; • its experience has demonstrated that conditions peculiar to remote northern communities require an approach different from typical Canadian building industry practice; or • specific products, systems or methods have been developed and have been found to be superior for northern conditions. Application of Guidelines Good Engineering Practice has been prepared as suggested guidelines for obtaining good value and quality water and sewer systems. The GEP is applicable to renovations to existing systems or new systems. Development of Good Engineering Practice These guidelines evolved from studying the typical water and sewer systems found in most communities in the NWT. The new guidebook incorporates guidelines from the Cold Climate Utilities Monograph, plus collected observations from designers, builders, and system operators and users. Further information was gathered by staff of the Water and Sanitation Section, in consultation with other stakeholders in the utilities industry. GOOD ENGINEERING PRACTICE Preamble and Revisions i
Page 1 and 2: GOOD ENGINEERING PRACTICE for NORTH
Page 3 and 4: TO THE READER The Northwest Territo
Page 5: SPECIAL ACKNOWLEDGEMENTS The public
Page 9 and 10: TABLE OF CONTENTS (Summary) Page PR
Page 11 and 12: 8.0 SANITARY SEWERS 8.1 Introductio
Page 13 and 14: Table of Contents GENERAL UTILITY O
Page 15 and 16: 1.2.5 Local Suppliers Specification
Page 17 and 18: 1.6 CODES, REGULATIONS AND GUIDELIN
Page 19 and 20: 1.6.8 Standards and Guidelines Stan
Page 21 and 22: 1.9 CONTACTS Contacts for technical
Page 23 and 24: 2.10 PIPE TESTING .................
Page 25 and 26: • Corrugated Metal Pipe (CMP) for
Page 27 and 28: Figure 2.1 - Schematic Ground Tempe
Page 29 and 30: Recommendation 2.4.1 High Density P
Page 31 and 32: 2.4.2 Polyvinyl Chloride (PVC) PVC
Page 33 and 34: 2.4.4 Steel (Cement Lined) Welded s
Page 35 and 36: Figure 2.3 - Mobilization of Envelo
Page 37 and 38: 2.7.2 Differential Movement Connect
Page 39 and 40: 2.8.3 Water Heating It is generally
Page 41 and 42: 2.9.3 45° Valved Nipples (50 mm) W
Page 43 and 44: Table of Contents ACCESS VAULTS AND
Page 45 and 46: 3.0 ACCESS VAULTS AND MANHOLES 3.1
Page 47 and 48: 3.3.2 Pre-cast Concrete Barrels (12
Page 49 and 50: Recommended for water valve and fir
Page 51 and 52: 3.4 STRUCTURAL DESIGN Regardless of
Page 53 and 54: 3.9 PREVENTION OF GROUNDWATER INFIL
Page 55 and 56: 3.10.4 Double-Walled HDPE Access Va
Page 57 and 58:
3.12 TESTING All access vaults and
Page 59 and 60:
4.0 FIRE PROTECTION 4.1 INTRODUCTIO
Page 61 and 62:
4.4 DISTRIBUTION Fire hydrants shou
Page 63 and 64:
4.6.2 Hydrants in Access Vaults Fir
Page 65 and 66:
4.8 CONSISTENCY To the extent possi
Page 67 and 68:
5.0 WATER SERVICES 5.1 INTRODUCTION
Page 69 and 70:
Recommendation 5.4.2 Water Circulat
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5.5 THAW RECOVERY Any service insta
Page 73 and 74:
Recommendation 5.6.3 Threadolets Re
Page 75 and 76:
5.7 CURB STOPS A separate curb stop
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5.9 INSTALLATION AND REPLACEMENT In
Page 79 and 80:
Table of Contents SANITARY SEWER SE
Page 81 and 82:
6.4 INSTALLATION Installation of bu
Page 83 and 84:
Use of a bend adjacent to the main
Page 85 and 86:
6.8 BUILDING/PLUMBING CONNECTION Ge
Page 87 and 88:
Table of Contents WATERMAINS Page 7
Page 89 and 90:
7.3.4 Pipe Size Minimum pipe diamet
Page 91 and 92:
7.10 LEAK DETECTION Watermain syste
Page 93 and 94:
Table of Contents SANITARY SEWERS P
Page 95 and 96:
8.3.4 Curved Sewers Curved sewers s
Page 97 and 98:
Table of Contents TRUCKFILL STATION
Page 99 and 100:
9.0 TRUCKFILL STATIONS AND PUMP HOU
Page 101 and 102:
Figure 9.2 - Typical Wetwell Intake
Page 103 and 104:
9.3.8 Pull Cable Recommend an aircr
Page 105 and 106:
9.5.3 Overhead Fill Arm The use of
Page 107 and 108:
9.7 BUILDING LAYOUT/FLOORPLAN Recom
Page 109 and 110:
9.9.3 Parking Recommend providing a
Page 111 and 112:
Table of Contents HOUSEHOLD STORAGE
Page 113 and 114:
Table of Contents WATER QUALITY AND
Page 115 and 116:
For groundwaters, recommend selecti
Page 117 and 118:
Filtration and disinfection should
Page 119 and 120:
11.6 DISINFECTION SYSTEM Unless the
Page 121 and 122:
11.7.2 Regulatory and Process Contr
Page 123 and 124:
11.9 RESIDUALS Wastewater residuals
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12.0 WATER STORAGE 12.1 INTRODUCTIO
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12.4 SEASONAL STORAGE Many northern
Page 129 and 130:
12.6.2 Equalization Storage Recomme
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13.0 INSULATION 13.1 INTRODUCTION T
Page 133 and 134:
13.4.3 Half Shells and Fitting Cove
Page 135:
13.7 ULTRAVIOLET AND MECHANICAL PRO
Page 164 and 165:
INDEX A Access Portals 2-17 Access
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INDEX G Gasket 2-13, 3-9, 3-11 Gate
Page 168 and 169:
INDEX R Rae 2-1, 2-2, 3-1, 12-2 Ran
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Good Engineering Practice for Northern Water and Sewer Systems

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