Good Engineering Practice for Northern Water and Sewer Systems

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1.0 GENERAL UTILITY OBJECTIVES The primary objective of Good Engineering Practice for Northern Water and Sewer Systems (GEP) is to provide a technical reference guidebook to help builders produce the best value in their respective utilities for the North. Utilities should be designed specifically for the northern climate and other physical parameters of the site, as well as to minimize the overall capital costs plus the life cycle operating and maintenance costs. The objective is to encourage improvement over time, based on proven methods and materials, while supporting improved utility performance and new technology. 1.1 GENERAL GOALS AND PRINCIPLES The goals and principles governing utilities design in the North include: • Protecting public health and safety; • Protecting the environment; • Effectiveness and efficiency; • Community acceptance; • Compliance with all relevant legislation and regulations; and • Following accepted good engineering practices. 1.2 USE OF LOCAL RESOURCES 1.2.1 General Promoting and actively assisting communities to take on greater responsibility for their economic and social well-being is an important objective of the GNWT. Construction projects provide important opportunities for communities to become involved in their own development. 1.2.2 Local Knowledge Residents of a community can provide valuable information related to site conditions such as snowdrifting patterns, preferred orientations, anticipated use patterns and examples of successful materials or methods. 1.2.3 Local Labour To maximize local involvement, materials and methods used in utilities construction should be suitable for broad application that will enable training applicable to future projects. To work towards achieving maximum local involvement, avoid the use of specialized products or installations. 1.2.4 Local Equipment The use of local equipment benefits the community and can reduce construction costs, as bringing equipment into most remote communities is extremely expensive. Utility design and construction methods should be suitable for available equipment. GOOD ENGINEERING PRACTICES 1-1 Apr-04 General Utility Objectives
1.2.5 Local Suppliers Specifications should not restrict local or northern suppliers. Locally available products should be incorporated where possible in new utilities. 1.2.6 Operation and Maintenance Installations should be completed by a certified tradesperson and annual inspections should be carried out by either a certified tradesperson or an engineer. Given the growing number of utility projects and the limited number of experienced tradespeople in the NWT, there is both a need and an opportunity to train and develop utility maintainers in every community. Operation and maintenance procedures should be written in plain language so that they are easily understood and carried out. Readily available maintenance products and equipment should be specified. 1.3 LIFE CYCLE COSTS Wherever alternative designs are considered, the alternative with the lowest life cycle cost should be selected. Wherever alternatives are shown to have the same life cycle costs, the alternative with the lowest capital cost should be selected. The life cycle costing should be based on the expected design life of the utility and its systems. For comparison, a 20-year economic design life should be used. In some circumstances, other considerations may overrule: for example, where direct benefits to the community will be realized (e.g., incorporating locally available materials), or where a product preference is stated in these guidelines. 1.4 ENERGY MANAGEMENT Minimizing the energy consumption of public utilities is important in the NWT where energy costs are extremely high; electricity is usually diesel generated, and fuel must be transported annually to remote locations. See “1.6.4 The National Energy Code” for comments on the National Energy Code. 1.4.1 Heating and Ventilation Recommendations for energy efficiency have been integrated in the applicable sections of the “Good Building Practice for Northern Facilities” guidebook. The NWT Public Water Supply Regulations (Sections 14(3) and 14(4)) also contain information relating to heating and ventilating of water treatment facilities. Truckfill stations in particular are generally not occupied for the full day, and building heat may be primarily intended for equipment freeze protection. Particular consideration should be paid to ventilation requirements for chemical mixing and storage areas. For more information, consult the MSDS (Material Safety Data Sheet) for the chemical of concern. 1.4.2 Lighting Recommendations for energy efficiency have been integrated in the applicable sections of the “Good Building Practice” guidebook. The NWT Public Water Supply Regulations (Section 14(5)) also contain information relating to lighting of water treatment facilities. GOOD ENGINEERING PRACTICES 1-2 Apr-04 General Utility Objectives
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 and 8: PREAMBLE Introduction The Good Engi
Page 9 and 10: TABLE OF CONTENTS (Summary) Page PR
Page 11 and 12: 8.0 SANITARY SEWERS 8.1 Introductio
Page 13: Table of Contents GENERAL UTILITY O
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
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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
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
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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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