ordinary meeting of council to be held on tuesday, 26 april 2005 at ...

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Ordinary Meeting <strong>of</strong> Council - 26 April 2005 8 / 2 Item 8 DA0177/03 24 March 2005 PURPOSE OF REPORT To consider a request for the proposed relocation <strong>of</strong> a Council s<strong>to</strong>rmwater drainage pipeline and easement located within No 15 Pearson Avenue, Gordon. BACKGROUND The applicant, Quirante Holdings Pty Ltd, submitted a Development Application (DA No.177/03) <strong>to</strong> Council for a dual occupancy development at 15 Pearson Avenue Gordon. As a consequence <strong>of</strong> the Land and Environment Court proceedings No.11324 <strong>of</strong> 2003, the development was approved by Commissioner Bly on 16 March 2004. Granting <strong>of</strong> the development was subject <strong>to</strong> the conditions in Annexure ‘A’ <strong>of</strong> the proceedings (Attachment 1) comprising three s<strong>to</strong>rmwater drainage pre-commencement conditions: • Requirement <strong>to</strong> vary the terms <strong>of</strong> the easement in No.17 Pearson, downstream. • Formalise the drainage works proposed in No.15 Pearson Avenue by submission <strong>of</strong> design plans • Requirement for Road Opening application for works in Burgoyne Street. The applicant has submitted revised s<strong>to</strong>rmwater plans and details, drawings GD 2.1 and GD 2.2, Revision C dated February 2003, and GD 2.4 Revision C dated June 2003, GD 2.5 and GD 2.6 Revision C dated August 2004, prepared by K.R Stubbs & Associates Pty Ltd. COMMENTS Current situation S<strong>to</strong>rmwater run<strong>of</strong>f from Burgoyne Street and Pearson Avenue converge in road pits on the southern boundary <strong>of</strong> No.15 which is then conveyed downstream by a 450mm diameter pipe. The pipe travels near the eastern boundary across No.15 in<strong>to</strong> No.17, discharging in<strong>to</strong> a natural gully about 6 metres <strong>be</strong>fore the northern boundary <strong>of</strong> No.17, as shown on drainage layout plan, Attachment 2. Pits near the southern boundary <strong>of</strong> No.15 are located in the road sag <strong>of</strong> Burgoyne Street. As such, overflows in excess <strong>of</strong> the public drainage system, over<strong>to</strong>p the kerb and run<strong>of</strong>f overland across No.15 in a northerly direction over the gully coinciding with the pipe. Proposal The s<strong>to</strong>rmwater plans and detail drawings prepared by K.R Stubbs and Associates was reviewed and seeks <strong>to</strong> modify the drainage system by: N:\050426-OMC-SR-03080-15 PEARSON AVENUE GORDON.doc/tattam /2
Ordinary Meeting <strong>of</strong> Council - 26 April 2005 8 / 3 Item 8 DA0177/03 24 March 2005 i. Provision <strong>of</strong> a 600mm diameter pipe relocated along the eastern boundary and <strong>to</strong> abandon the existing 450mm diameter pipe. The pipeline is sized <strong>to</strong> cater for the calculated 1 in 20 year ARI design flow <strong>of</strong> 860 L/s. ii. Installation <strong>of</strong> a new grated pit at the common boundary <strong>of</strong> No.15 and 17 <strong>to</strong> reconnect in<strong>to</strong> the existing 450mm diameter pipe that will remain in No.17 downstream. iii. Provision <strong>of</strong> a relief overflow route over the relocated pipeline <strong>to</strong> convey surface flows in iv. excess <strong>of</strong> the road pit capacity, requiring terms for Restriction on Use varying in width. Provision <strong>of</strong> additional road drainage pits and pipe work on the northern side <strong>of</strong> Burgoyne Street as a consequence <strong>of</strong> a new driveway access <strong>to</strong> the proposed development. v. Provision <strong>of</strong> an increased Easement <strong>to</strong> drain water 1.6m in width which complies with DCP 47. Variation <strong>to</strong> Terms <strong>of</strong> easement Both properties at No.15 & No.17 Pearson Avenue are burdened by a 1.22 metre wide drainage easement, indicated on the drainage layout plan as Attachment 2, as LD 932 and LD 944 respectively. In these documents, the terms <strong>be</strong>nefit the Council only, allowing surface and s<strong>to</strong>rmwaters from Burgoyne Street and Pearson Avenue, with specific reference for conveyance <strong>of</strong> the s<strong>to</strong>rmwater by a 450mm diameter pipe. Both LD 932 and 944 are required <strong>to</strong> <strong>be</strong> extinguished with a new easement created pursuant <strong>to</strong> Section 88B <strong>of</strong> the Conveyancing Act 1919. Documentation is required <strong>to</strong> address: • The upsized pipe, • restriction on use for the overland flow path, and • consent from No.17 for the discharge <strong>of</strong> private s<strong>to</strong>rmwater across their land from No15. The applicant has submitted a Section 88B instrument and linen plan for execution which is signed by both owners <strong>of</strong> No.15 and No.17 which appears <strong>to</strong> address the above requirements satisfac<strong>to</strong>rily. Downstream <strong>of</strong> No.17, the s<strong>to</strong>rmwater is conveyed across another four properties until the public system in Mt William Street. However, consents were not required as the four properties do not have easements and the 450mm pipeline terminates in<strong>to</strong> an existing natural gully within No.17. Assessment <strong>of</strong> proposed s<strong>to</strong>rmwater drainage Attached are reduced scale plans <strong>of</strong> drawing GD 2.1 as Attachment 3 showing the S<strong>to</strong>rmwater management, and partial drawing GD 2.4 showing the relief overflow path as Attachment 4. Drainage details submitted <strong>to</strong> support the application were assessed and are considered satisfac<strong>to</strong>ry. The following critical issues are noted: i. Any up welling <strong>of</strong> s<strong>to</strong>rmwater at the transition pit (pit 10) <strong>be</strong>tween the upsized pipe (600mm) in<strong>to</strong> the existing pipe (450mm) is considered indifferent as the magnitude <strong>of</strong> overflows across No.17 is unchanged. The origin <strong>of</strong> overflow may either occur from over<strong>to</strong>pping <strong>of</strong> the kerb or from the internal pit (pit 10) within No.15. Intermediate pits (pit 10, 12 & 13) in the property, N:\050426-OMC-SR-03080-15 PEARSON AVENUE GORDON.doc/tattam /3
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ORDINARY MEETING OF COUNCIL TO BE H
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Owner: C A Building Pty Ltd To dete
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To consider a request by the Applic
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Section 69 of the
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efforts made by the Government and
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Ordinary Meeting of</strong
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Development & Regulation...........
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Replacement of Ass
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endangered ecologically communities
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THIS SCENARIO IS WITHOUT THE VARIAT
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challenge - securing Sydney’s wat
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Most of the urban
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Programme Biodiversity Sub
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Table 8 Proposed walking track site
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Regulation and enforcement Sub <str
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