Code of Practice for Wastewater Infrastructure

1 Code of Practice for Wastewater Infrastructure Connections and Developer Services Design and Construction Requirements for Self-Lay Developments July 2020 (Revision 2). Document IW-CDS-5030-03. IW-CDS-5030-03. IW-CDS-5030-03 (Revision 2 2020). SCOPE. This Code of Practice outlines acceptable typical design and construction details that are required by Irish Water for the provision of Wastewater pipes and related Infrastructure in Self-lay Developments which are to be connected to the Irish Water Network. It shall be used in conjunction with the associated Design Risk Assessments that have been developed which identify the risks that designers shall take into account in the detailed design of the Wastewater pipes and related Infrastructure to be connected to the Irish Water Network.

2 The pipes and related Infrastructure to be put in place within Developments shall comply fully with this Code of Practice . Ultimate responsibility (including, but not limited to any losses, costs, demands, damages, actions, expenses, negligence and claims) for the detailed design, construction and provision of such pipes and related Infrastructure shall rest entirely with the Developer, his/her designer(s), contractor(s), or other related party. Irish Water assumes no responsibility for and gives no guarantees, undertakings or warranties in relation to the pipes and related Infrastructure to be provided in accordance with this Code of Practice . No part of the Code of Practice shall be reproduced or transmitted in any form or stored in any retrieval system of any nature without the written permission of Irish Water as copyright holder, except as agreed for use.

3 This Code of Practice shall be used in conjunction with current Connection and Developer Services Standard Details. Standard Details can be found on the Irish Water website at Revision Log Date Details of Revision Revision Author Approver December 2016 Initial Issue 0 TO'C MO'D. December 2017 General Revision 1 T'OC M'OD. (See Appendix E). July 2020 General Revision 2 T'OC MO'D. (See Appendix D). i IW-CDS-5030-03 (Revision 2 2020). Background Technical Documentation was developed by Irish Water's Connection and Developer Services which outlines the requirements for Wastewater services Infrastructure within Developments. The Technical Documentation comprises Codes of Practice and Standard Details. These provide Irish Water's requirements to Developers in the provision of Wastewater Infrastructure that is to be installed by Self-Lay methods in Developments and that are to be connected to Irish Water's networks and subsequently vested in Irish Water.

4 The Technical Documentation outlines design and construction requirements to ensure consistency in the provision of materials, equipment, workmanship, etc. They will also provide the basis for developers detailed design proposals for Wastewater Infrastructure , leading to the provision of Infrastructure that is suitable for connection to Irish Water's networks and easy operation and maintenance. The Technical Documents are based on best Practice within the water industry. They take account of the experience of Local Authorities in the provision of these services to new Developments. This document (IW-CDS-5030-03) comprises the Code of Practice for Wastewater Infrastructure and outlines design and construction for developers. It shall be read in conjunction with its associated Design Risk Assessment (IW-CDS-5030-04).

5 The Standard Details for Wastewater (IW-CDS-5030-01) and its associated Design Risk Assessment (IW-CDS-5030-02) are published and available on the Irish Water website at ii IW-CDS-5030-03 (Revision 2 2020). TABLE OF CONTENTS. Glossary of Terms and Definitions 1. Part 1 General 10. Introduction 10. Statutory Relevance 10. Options for Works Construction 11. Connection Procedure 11. Types of Sewage Collection Systems 12. Specialist Works 13. Private Pipework 14. Application for a Conformance Certificate 14. CCTV & Manhole Surveys in Advance of Commencement of the Defects Liability Period 17. Asset Naming 18. CCTV Surveys 18. Sewer Record Information 20. Conformance Certificate 22. Connection of Development to Irish Water Network 23. Vesting 23. Defects Liability Period 24.

6 Completion Certificate 26. Final inspection at Defects Liability Termination 26. Statutory and Other Consents 26. iii IW-CDS-5030-03 (Revision 2 2020). Fire Authority Liaison 27. Regulations 27. Standards 27. Civil Engineering Specification for the Water Industry (CESWI) 27. Standard Details 28. Temporary Wastewater Connection for Construction Purposes 28. Extensions to Undeveloped Contiguous Areas 28. Part 2 Design Requirements and Submissions 30. Introduction 30. General Design Requirements 30. Design Submissions 31. Drawings, Calculations and Design Information 33. Hydraulic Modelling 35. Part 3 Works Design 37. compliance 37. Reliability and Design Objectives 37. Materials General Requirements 37. Structural Design and Integrity Specific Requirements 38.

7 Layout of Works and Manholes 39. Hydraulic Design for Gravity Sewers 44. Hydraulic Design for Rising Mains 47. Pipe Sizes 49. iv IW-CDS-5030-03 (Revision 2 2020). Depth of Cover 49. Roadway/Footway Surface Reinstatement 50. Access to the Works 50. Manholes 53. General 53. Manhole Dimensions 56. Manhole Bases 56. Manhole Walls 56. Manhole Roofs 57. Manhole Inverts and Benching 57. Manhole Shafts 58. Rocker Pipes 58. Manhole Covers and Frames 58. Manhole Steps 59. Ladders 59. Gravity Sewer Pipe Material Types 60. Rising Main Pipe Material Types 61. Rising Main Discharge (Header) Manhole 61. Pipe Joints 62. General 62. Jointing of Polyethylene Pipes 63. Auditing and Testing of Polyethylene Pipes 64. Rising Main Fittings 67. v IW-CDS-5030-03 (Revision 2 2020).

8 General 67. Sluice Valves 67. Scour Valve Arrangements 68. Wastewater Air Valves 69. Other Fitting Materials 69. Sluice Valve, Scour Valve and Air Valve Chambers 71. Sluice Valve Chamber 71. Scour Chamber 72. Air Valve Chamber 74. Existing Utilities 75. Working near Existing Pipes (Notifications and Separation Distances) 76. Environmental Considerations 77. Food Service Establishments 79. Grease Traps 79. Macerators 79. Basements 79. Marker Tape 80. Indicator Marker Plates and Posts 80. Part 4 Construction Related Issues 82. Construction General Requirements 82. Transportation, Storage, Handling and Use of Materials 83. Location of Other Utilities 84. Trench Widths 84. vi IW-CDS-5030-03 (Revision 2 2020). Trench Base 85. Cleaning Pipes 85. Pipe Bedding, Haunch and Surrounds 85.

9 Backfill 87. Anchor/Thrust/Support Blocks for Rising Mains 89. Testing of Gravity Sewers and Manholes 90. Pressure Testing of Rising Mains 93. General 93. Testing of Ductile Iron Pressure Pipelines 93. Testing of Polyethylene Pipelines 95. Connections 96. Protection against Flooding 97. Part 5 Pumping Stations 98. Pumping Stations Provision 98. General Requirements 98. Specific Minimum Requirements 99. Layout of Pumping Station 100. Location of Pumping Station 102. Fencing and Boundary Security 103. On-Site Parking and Hard-Standing 104. Hydraulic Design of Pumping Stations 105. Pumping Plant 107. vii IW-CDS-5030-03 (Revision 2 2020). Wet Well 109. Emergency Storage 112. Valve Chamber 114. Flow Metering 116. Access to the Wet Wells, Valve Chambers and Other Chambers 117.

10 Venting of Wet Well and Chambers 119. General Electrical Requirements 119. Cables 120. Cable Installation 121. General 121. Glanding 122. Termination 122. Junction Boxes 122. Identification of Wiring 123. Control Panel General Requirements 123. Form 4 Control Panel Compartments Additional Requirements 125. Incomer Section 125. Control Circuit Supply 126. Motor Start Compartment 126. Earthing and Bonding 126. Earthing Electrode 127. Bonding 127. Pumping Station Control Panel Enclosure 127. viii IW-CDS-5030-03 (Revision 2 2020). Control Philosophy 129. Testing 130. Abnormal Operation 131. Power Failure 131. Pump Failure 132. Telemetry 132. Dial Out Alarm 133. Meter Chambers 133. Cable Ducts and Chambers 135. Lifting Equipment 137. Wash-Down Facilities 137.