TRENCHING, BEDDING AND BACKFILL FOR UNDERGROUND …

1 January 2014 TRENCHING, BEDDING AND BACKFILL FOR UNDERGROUND SERVICES PROJECT SPECIFICATION MP-06-DES-SP Trenching, BEDDING and BACKFILL for UNDERGROUND services specification Rev. Status Prepared by Checked by Date 1 100% Detailed Design Costas Chryssafis Johnny Priestley 10/01/2014 Name Position Date Signature Johnny Priestley Services team leader 10/01/2014 Trenching, BEDDING and BACKFILL for UNDERGROUND services Memorial Park Alliance / MP-06-DES-RP Trenching, BEDDING and BACKFILL for UNDERGROUND services specification 2 Project Specification Contents 1 Trenching, BEDDING and backfilling for UNDERGROUND services .. 3 Scope .. 3 Compliance .. 3 Dry services .. 3 Definition .. 3 BEDDING and BACKFILL materials .. 3 Power Services .. 3 Gas Services .. 6 Telecommunications Services .. 6 Traffic Monitoring Services (CCTV) .. 8 Drainage and water pressure pipe services.

2 9 BEDDING and 9 Subsoil Drains with Filter Fabric .. 9 Subsoil drains without filter fabric .. 10 Competent rock .. 11 Construction .. 11 Trenching .. 11 Pipe BEDDING and support .. 13 Backfilling .. 14 Reinstatement .. 15 Testing general .. 15 Trenching, BEDDING and BACKFILL for UNDERGROUND services Memorial Park Alliance / MP-06-DES-RP Trenching, BEDDING and BACKFILL for UNDERGROUND services specification 3 Project Specification 1 Trenching, BEDDING and backfilling for UNDERGROUND services Scope This Section details the requirements for trenching, BEDDING and backfilling for pipes and UNDERGROUND services of the form and dimensions shown on the Drawings, and as specified in these Specifications. Where the words pipe, pipelaying, pipework, etc., are used in this Section to determine phases of work, those words shall include duct, duct laying, duct work, etc.

3 , as applicable. Compliance Construction work performed under this Section shall comply with the general requirements of the following documents and the specific requirements of this Section: NZS 4452 Code of practice for the construction of UNDERGROUND pipe sewers and drains The Health and Safety in Employment Act and Regulations. Approved Code of Practice for Safety in Excavations and Shafts for Foundations. Guidelines for the Provision of Facilities and General Safety in the Construction Industry. Excavation Guide, Safety in Construction No. 5 to the extent that it does not conflict with any of the above. Local Authority and Government (NZTA) standards. Dry services Definition Dry services denote non-drainage and water supply services, they denote power, gas, telecommunication and CCTV traffic monitoring services. BEDDING and BACKFILL materials Materials for duct BEDDING and BACKFILL , including their compaction requirements, shall be as shown on the Drawings.

4 For common trenches accommodating wet (drainage and water supply) services and dry services, the BEDDING and BACKFILL specified shall be provided for the portion of the trench housing the dry services. BEDDING and BACKFILL for the wet services shall be as specified in section of this Specification. Electrical Services Utility Supply a) General Wellington Electricity Lines Ltd (Wellington Electricity) is responsible for the supply and distribution of power to and through the park, as well as to the street lighting adjacent to the underpass. The demarcation point of the supply to the park is at the UAB. The installation of new, or relocation of existing power cables for these Trenching, BEDDING and BACKFILL for UNDERGROUND services Memorial Park Alliance / MP-06-DES-RP Trenching, BEDDING and BACKFILL for UNDERGROUND services specification 4 Project Specification services will be undertaken by Wellington Electricity (WE).

5 Trenching and installation of cable ducts in preparation for these works shall be undertaken by the Constructor. The required locations of the ducts are shown on the Drawings. The Constructor shall notify Wellington Electricity (WE) prior to commencement of construction of any temporary or permanent works affecting these power services. WE contact details are: Organisation: Wellington Electricity Contact: Peter Robinson Direct Dial: 04 915 6114 Mobile: 021 770 875 Email: Physical address: 75 The Esplanade, Petone The Constructor shall provide in its programme for early liaising and coordination with Wellington Electricity. b) Duct Materials The WE ducting requirements are specified in the table below: Ducts shall be joined using spigot-socket glued joints. Draw wire or a pull string complying with Wellington Electricity specifications shall be installed in each completed overall length of ducting.

6 Marker tape complying with Wellington Electricity specifications shall be installed 300 mm above the power ducting. Ducts shall be installed in clean, gravel material as shown on the Drawings. c) Duct installation Gravel compaction beneath and around the ducts shall be as shown on the Drawings. The ends of overall lengths of ducts shall be satisfactorily plugged to prevent material ingress into the ducts. d) As-built information Service Provider Service Duct Size (mm) Duct Material Duct Strength Duct Colour Duct Minimum Bend Radius (mm) Duct Supplier Wellington Electricity Communications (Fibre optic cable) 100 PE PE80B Red 1000 WE approved supplier NZTA approved supplier Low voltage (LV) 400V and 230V AC 100 PE PE80B Orange 1000 11kV and direct current (DC) 150 PE PE80B Orange 3000 Pilot 100 PE PE80B Orange 1000 Street lighting and Traffic signals 100 PE PE80B, PN Orange 1000 Trenching, BEDDING and BACKFILL for UNDERGROUND services Memorial Park Alliance / MP-06-DES-RP Trenching, BEDDING and BACKFILL for UNDERGROUND services specification 5 Project Specification Installed ducts shall be photographed and their location recorded by registered survey prior to backfilling over the ducts.

7 Electrical Services Park Supplies a) General The nominated electrical contractor shall be responsible for the installation of all electrical reticulation from the UAB to the park site and the installation shall comply with AS/NZS 3000. Conduit shall be sized in accordance with AS/NZS 3000 requirements. Consideration of cable de-rating shall apply. Conduit shall be high impact PVC except where surface mounted conduit may be subjected to mechanical damage or where specific additional electrical screening is nominated in which case hot dipped galvanised (HDG) steel conduit shall be used. All surface and concealed commercial conduit shall be run either parallel or perpendicular to main building lines. Horizontal paths at low levels along walls should be minimised. b) Cable Drawing The Main Electrical Contractor shall supply all installation equipment including stands, rollers, winch, and cable pulling socks necessary for the installation of the cable.

8 The manufacturer s recommended maximum pulling tension shall not be exceeded during installation and where a winch or other pulling method is used this shall be controlled by a dynamometer or equivalent system. The Main Electrical Contractor shall lubricate cable ducts before pulling cable through ducts. Connection to the cable shall be via an approved pulling sock. Rollers shall be used to support the cable and at bends. At bends the bending radius shall not be less than that specified by AS/NZS3000, AS3008 or the manufacturer s recommendations. The Main Electrical Contractor is to prove the ducts prior to any pull. c) Rigid PVC Conduit Rigid PVC conduit shall comply with AS2053 and electrical conduit shall be orange coloured high impact Class B type. Instrumentation conduit shall generally be grey in colour. Surface conduit on concrete shall be saddled and fixed via stainless steel saddles and anchors.

9 Saddle spacing shall be such so as to avoid sagging and long sections shall be fitted with expansion joints. Small diameter protective conduit (up to 50mm) to external or internal switchboard/equipment enclosures shall be glanded onto the cabinet. PVC conduits shall be jointed using coloured PVC solvent cement applied in accordance to manufacturer s instructions and shall be water tight. d) Buried Conduit Buried conduit shall be PVC rigid high impact orange installed in accordance with AS/NZS 3000. Long radius bends shall be to facilitate drawing of cables and no short elbows are permitted. All conduit runs shall be sealed against water ingress. All unused conduits shall be fitted with non-corroding draw-wires and capped. All completed cable run conduit ends shall be sealed with foam filler. e) Cable Pits for Buried Cable Trenching, BEDDING and BACKFILL for UNDERGROUND services Memorial Park Alliance / MP-06-DES-RP Trenching, BEDDING and BACKFILL for UNDERGROUND services specification 6 Project Specification Cable pits are to be provided at all cable turn points and otherwise at intervals as shown on the drawings.

10 The cable pit shall be sized to accommodate the cable radiuses expected for drawing in the associated cables. Typical cable pit details shall be provided. Gas Services a) General Powerco is responsible for the public gas supply system in the vicinity of the works. Any relocation of gas pipes required under the project will be undertaken by Powerco. Trenching and installation of ducts in preparation for the installation of the gas shall be undertaken by the Constructor. The required locations of the ducts are shown on the Drawings. The Constructor shall notify Powerco prior to commencement of construction of any temporary or permanent works affecting gas services. Powerco contact details are: Organisation: Powerco Contact: Mark Morrison Direct Dial: 04 978 0525 Mobile: 022 262 7576 Email: Physical address: The Gas Hub, 1 Market Grove, Lower Hutt The Constructor shall provide in its programme for early liaising and coordination with Powerco.