Works Approval Report.pdf - the National Capital Authority

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Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development Agency8.12 Site Servicing8.12.1 Existing External ServicesIt is known that the northern verge of Constitution Avenue is congested with existing services andthat electricity and communication services are located within the western verge of Creswell Street.Services in these verges may need to be lowered / protected to allow construction of new accessroads into the Campbell Section 5 development. The exact impact of these services on the designand any relocation will be addressed during detailed design in coordination with the utility providers.8.12.2 SewerageRefer to drawing 110029/C1600 - 1602ExistingInitial investigations suggest that there is 2-3m cover over a 375mm diameter trunk sewer main onConstitution Avenue in the vicinity of the proposed intersection of Constitution Avenue / WendoureeDrive / Road 3. The depth to the top of the existing sewer should be satisfactory and negate theneed for diversion or adjustment (other than resetting manhole covers); however, this will be verifiedduring the detailed design.An existing 225mm diameter sewer traverses the middle of the site in a northeast to southwestdirection before connecting to the 375mm trunk main in Constitution Avenue. The existing 225mmsewer alignment directly conflicts with one of the development blocks and will require diversion.ActewAGL has been engaged to discuss the diversion of this sewer. Cardno was advised that thenetwork in this location is near capacity and that the proposed diversion should be completed withan increased diameter pipe. ActewAGL has accepted the forecast sewerage loads (EP of 1381) as aresult of this development.ProposalA new 225mm diameter plastic sewer pipe is to be laid from the existing sewer to the sewer tie fromBlock A. Downstream of this sewer tie, the sewer will increase to a 300mm diameter plastic pipe.This new length of pipe will be located in the eastern verge of Road 1-(B) and Road 1-(C). It isproposed that the new 300mm diameter sewer pipe will traverse from the east to the west side ofRoad 1-(C) before crossing under Constitution Avenue and connecting to the 375mm sewer main inthe southern verge of Constitution Avenue.Sewer ties to each Block will be 150mm diameter plastic pipe.8.12.3 WaterRefer to drawing 110029/C1650 - 1652ExistingCardno has been advised by ActewAGL that a 300mm diameter trunk water main runs along thenorthern verge of Constitution Avenue, within 1m of the block boundary at the back of the verge. TheNovember 2012 Cardno 78
Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development Agencydepth of cover over this service is believed to conflict with the proposed intersection upgrades atConstitution Avenue / Wendouree Drive / Road 3. It is anticipated that a diversion of the water mainwill be necessary at this location; however, this will be verified during the detailed design.ProposalThe existing 300mm water main on Constitution Avenue may need to be lowered to achieve cover ofat least the minimum 750mm under the proposed intersection at Constitution Avenue / WendoureeDrive / Road 3.It is proposed that 150mm diameter water mains be looped around the blocks throughout thedevelopment. This new water network will be supplied from the existing 300mm water main inConstitution Avenue and the 150mm water mains in Anzac Park East and Page Street. ActewAGLwere consulted and advised Cardno that they have no issues with the water master plan proposals.Water ties to each Block will be 150mm diameter plastic pipe.ACT Fire and Rescue has also been consulted over the water master plan for Campbell Section 5and the site has been classified as Fire Risk Category F4. This classification requires hydrants to bespaced at 60m intervals and capable of delivering 60L/s at all times.8.12.4 ElectricityExistingUnderground electricity infrastructure is located in the verges of Constitution Avenue, CreswellStreet and Chowne Street. The high voltage electric network is located along the western verge ofCreswell Street. ActewAGL is undertaking an electrical master plan to service the site.It is anticipated that electrical services will require relocation on Creswell Street and ConstitutionAvenue; however, this will be verified during the detailed design.ProposalIt is proposed that street lighting and electrical infrastructure will be provided throughout theCampbell Section 5 development.Discussions with ActewAGL have identified a possible High Voltage supply to the site from atransformer on Getting Crescent. This feed would then supply sub-stations within the site.It is proposed that substations be located within recesses in the development Blocks.A dedicated trench for High and Low voltage electricity will be provided through the development asrequested by ActewAGL to service the substations easements within each block.November 2012 Cardno 79
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Works Approval Report.pdf - the National Capital Authority

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