Good Engineering Practice for Northern Water and Sewer Systems

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Revisions Periodic reviews will be undertaken to reconfirm, revise or update the content of Good Engineering Practice. Your comments and suggestions are invited. Proposed changes or additions should be submitted to: Manager, Water and Sanitation Section, Asset Management Division, Department of Public Works and Services, GNWT, Box 1320, Yellowknife, NT, X1A 2L9 Phone (867) 920-6142 Fax (867) 873-0226 E-mail: GEP@gov.nt.ca (attach additional pages if necessary) Referenced section # and section name: A brief description of your proposed change or addition: Rationale (relate experiences that have led you to make this recommendation): Your name: Occupation / position: Organization / firm / department: Mailing address: Phone (work): Date: Fax (work): E-mail: GOOD ENGINEERING PRACTICE Preamble and Revisions ii
TABLE OF CONTENTS (Summary) Page PREAMBLE Introduction........................................................................................................................................ i Revisions...........................................................................................................................................ii 1.0 GENERAL UTILITY OBJECTIVES 1.1 General Goals and Principles.............................................................................................. 1-1 1.2 Use of Local Resources ......................................................................................................1-1 1.3 Life Cycle Costs................................................................................................................... 1-2 1.4 Energy Management ...........................................................................................................1-2 1.5 Appropriate Technology ......................................................................................................1-3 1.6 Codes, Regulations and Guidelines .................................................................................... 1-4 1.7 GNWT Standard Drawings.................................................................................................. 1-6 1.8 Roles and Responsibilities ..................................................................................................1-7 1.9 Contacts .............................................................................................................................. 1-8 2.0 PIPING 2.1 Introduction.......................................................................................................................... 2-1 2.2 Materials in Use................................................................................................................... 2-1 2.3 Above or Below Grade Installation ...................................................................................... 2-3 2.4 Pipe Material Selection Criteria ...........................................................................................2-5 2.5 Utilidors.............................................................................................................................. 2-10 2.6 Pipe Bedding ..................................................................................................................... 2-11 2.7 Connections to Structures ................................................................................................. 2-13 2.8 Freeze Protection .............................................................................................................. 2-15 2.9 Thaw Recovery.................................................................................................................. 2-16 2.10 Pipe Testing....................................................................................................................... 2-18 3.0 ACCESS VAULTS AND MANHOLES 3.1 Introduction.......................................................................................................................... 3-1 3.2 Materials in Use................................................................................................................... 3-1 3.3 Manhole and Access Vault Selection Criteria...................................................................... 3-2 3.4 Structural Design................................................................................................................. 3-7 3.5 Access Vault/Manhole Location .......................................................................................... 3-7 3.6 Access Vault Bedding.......................................................................................................... 3-8 3.7 Prevention of Frost-Jacking.................................................................................................3-8 3.8 Prevention of Floatation....................................................................................................... 3-9 3.9 Prevention of Groundwater Infiltration ................................................................................. 3-9 3.10 Mechanical Components ................................................................................................... 3-10 3.11 Marker Posts ..................................................................................................................... 3-12 3.12 Testing............................................................................................................................... 3-13 GOOD ENGINEERING PRACTICE
Page 1 and 2: GOOD ENGINEERING PRACTICE for NORTH
Page 3 and 4: TO THE READER The Northwest Territo
Page 5 and 6: SPECIAL ACKNOWLEDGEMENTS The public
Page 7: PREAMBLE Introduction The Good Engi
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
Page 71 and 72:
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
Page 77 and 78:
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
Page 125 and 126:
12.0 WATER STORAGE 12.1 INTRODUCTIO
Page 127 and 128:
12.4 SEASONAL STORAGE Many northern
Page 129 and 130:
12.6.2 Equalization Storage Recomme
Page 131 and 132:
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
Page 166 and 167:
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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