General Meeting


Wednesday 8 November 2017

at 6:30PM



Hornsby Shire Council                                                                                           Table of Contents

Page 1





Item 5     LM7/17 Additional Information - Construction of a Maintenance Building Ancillary to an Existing Educational Establishment - 28, 28A & 30 Unwin Road, Wahroonga.............................. 1

Item 6     LM8/17 Additional Information - Development Application – Subdivision Six Allotments Into 13 Lots – 2A and 6 Judith Avenue and 589, 591, 591A and 593 Pacific Highway, Mount Colah ... 4   




Planning Division

Date of Meeting: 8/11/2017




PL53/17 - Development Application - Construction of a Maintenance Building Ancillary to an Existing Educational Establishment - 28, 28A and 30 Unwin Road, Wahroonga



Additional information with CHANGE to Recommendation

The proposed development involves drainage of inter-allotment stormwater over 5 downstream properties (No. 30A Unwin Road; No. 32 Unwin Road; No. 32A Unwin Road; No. 34 Unwin Road and No. 34A Unwin Road). A deferred commencement condition for the registration and creation of an easement to drain water from the site over these downstream properties is recommended in Schedule 1.

The applicant has submitted amended drainage plans proposing to connect the stormwater pipe to the Council pipe line within Unwin Road by constructing a new line to the nearest pit to negate the need to obtain an easement through downstream properties.  Council’s engineering assessment raises no objection to the amended drainage proposal. Accordingly, it is recommended that condition No. 1 be deleted and condition Nos. 2 and 14 be amended as follows:

Condition No. 2 to read:

2.         Approved Plans and Supporting Documentation

       The development must be carried out in accordance with the plans and documentation listed below and endorsed with Council’s stamp, except where amended by Council and/or other conditions of this consent:

1.         Plan No.

2.         Plan Title

3.         Drawn by

4.         Dated

5.         21627.01/A

6.         Site Plan

7.         Priestleys architects

8.         30 March 2017

9.         21627.02/C

10.       Ground Floor Plan

11.       Priestleys architects

12.       7 September 2017

13.       21627.03/A

14.       First Floor Plan

15.       Priestleys architects

16.       30 March 2017

17.       21627.04/B

18.       Elevations 1

19.       Priestleys architects

20.       28 August 2017

21.       21627.05/B

22.       Elevations 2

23.       Priestleys architects

24.       28 August 2017

25.       21627.06/A

26.       Sections

27.       Priestleys architects

28.       30 March 2017

29.       21627.07/A

30.       Storage Shed Floor Plans

31.       Priestleys architects

32.       30 March 2017

33.       C1.01 Issue D

34.       Cover Sheet, Notes and Legends

35.       ACOR

36.       13 October 2017

37.       C1.05 Issue D

38.       Details Sheet 1

39.       ACOR

40.       13 October 2017

41.       C1.06 Issue D

42.       Details Sheet 3

43.       ACOR

44.       13 October 2017

45.       C1.07 Issue A

46.       Details Sheet 3

47.       ACOR

48.       13 October 2017

49.       C2.01 Issue D

50.       Stormwater Management Plan

51.       ACOR

52.       13 October 2017

53.       C2.05 Issue B

54.       Pavement Plan

55.       ACOR

56.       13 October 2017

57.       C3.01 Issue D

58.       Erosion & Sediment Control Plan

59.       ACOR

60.       13 October 2017

61.       C3.02 Issue C

62.       ESCP - Demolition Works

63.       ACOR

64.       13 October 2017

65.       H1.00 Issue DA01

66.       Hydraulic Services Ground Floor Trade Waste Drainage Plan

67.       ACOR

68.       8 June 2017


69.       Document Title

70.       Prepared by

71.       Dated

72.       Traffic and Parking Impact Report No. 17004 01

73.       TEF Consulting

74.       23 March 2017

75.       Arboricultural Impact Assessment

76.       Arborsafe

77.       30 March 2017

78.       Environmental Noise Impact Assessment Ref: TJ574-01F01

79.       Renzo Tonin & Associates

80.       31 March 2017

81.       Geotechnical Investigation Report Ref: 30175ZHrpt

82.       JK Geotechnics

83.       31 March 2017

84.       BCA Assessment Report Ref: 107932-BCA-r2

85.       BCA Logic

86.       31 March 2017

87.       Waste Management Plan

88.       Barker College

89.       6 April 2017


Condition No. 14 to read:

14.        Stormwater Drainage

       The stormwater drainage system for the development must be designed for an average recurrence interval (ARI) of 20 years and be gravity drained via an  on-site detention and  water quality treatment facility in accordance with the following requirements:

a)         Connected directly to a Council’s pipe line in Unwin Road by constructing a new  line from the development site to the nearest Council pit;

b)         Be designed by a Chartered  Professional Civil/ Hydraulic Engineer of the Institution of Engineers, Australia; and

c)         An application is to be submitted to Council for construction of the drainage line within Unwin accordance with section 138 of Local Government Act 1993.

       Note:  Council is the only authority to approve construction of pipe line within Council road reserve.



THAT Development Application No. DA/321/2017 for construction of a new maintenance building for use in conjunction with an existing educational establishment at Lot 1 DP 528800, Lot 2 DP 528800 and Lot 3 DP 564798, Nos. 28, 28A and 30 Unwin Road, Wahroonga be approved subject to the conditions of consent detailed in Schedule 1 of Group Manager’s Report No. PL53/17 as amended by Memo LM7/17.






James Farrington

Group Manager

Planning Division




Rod Pickles

Manager - Development Assessment

Planning Division





There are no attachments for this report.


File Reference:           DA/321/2017

Document Number:    D07330370



Corporate Support Division

Date of Meeting: 8/11/2017




PL44/17 - Development Application - Subdivision Six Allotments Into 13 Lots - 2A & 6 Judith Avenue and 589, 591, 591A & 593 Pacific Highway, Mount Colah  



Additional information with  CHANGE  to Recommendation


Council has received a late submission which raises concerns that the submitted Preliminary Contamination Investigation Report does not address the full extent of contamination present on the subject site.

Although a review of the history of the site suggests that it has been predominantly used for residential purposes with some orchard activities noted on some of the properties, it is evident from the presence of areas of asbestos and fill that part of the site is contaminated.  For that reason, the applicant has lodged a Preliminary Contamination Investigation Report which includes a detailed analysis of eleven borehole samples taken from the site.

The Report notes that part of the site is thickly overgrown with weeds and grass.  This meant that the ground surface could not be fully examined to ascertain the full extent of the contamination. In particular, the Report notes states that:

·              The Subject Site is impacted buried fill containing asbestos, particular in the middle portion identified as Site Feature H noting that the full extent of fill was not identified from this preliminary investigation.

·              The site was also found to be impacted by Asbestos sheetings and fragments in a number of locations (ie Site Feature B, E (previous house) and G (partially demolished building)).

·              Some lead contamination was also encountered in the vicinity of the previous house (Site Feature E) and it is possible for this lead contamination to be confined to a localised area.

The Report states that to ensure suitability of the subject site for the proposed development, the site should be remediated by excavation and removal of surface and buried rubbish fill and rubbish and asbestos impacted fill and disposal to a NSW EPA approved landfill.

State Environmental Planning Policy No. 55 (SEPP 55) requires the issue of contamination to be considered whenever a planning authority considers a development proposal where the new use may increase risk from contamination.  Ultimately, Council needs to be satisfied that a site is suitable for its proposed use or can and will be made suitable, based on what it knows of the site.

The Preliminary Investigation Report discusses the possibility of alternative asbestos remediation works to reduce landfill disposal costs.  It notes that this could involve management in situ, treatment on site and removal of site to a landfill.  Assuming that the treatment of the contaminated soil from the site occurs on-site, it is possible that the remediation may constitute designated development if it involves the treating and storing of more than 30,000 cubic metres of contaminated soil.  Alternatively, should contaminated fill be intended to be removed from the site, the volume of the contaminated material and associated number of truck movements has not been ascertained.  The finished ground levels for the proposed lots have not been determined.

Section 2.4 of Group Manager’s Report PL44/17 notes that further detailed investigation is required to determine the full extent of contamination and recommends conditions of consent for further contamination assessment.  However, it is acknowledged that until the extent of contamination is confirmed, it would not be possible for a Remediation Action Plan (RAP) to be prepared and this could only be ascertained by carrying out the detailed investigation.  Further, if a RAP is not submitted as part of the development application process, it may be necessary for it to be the subject of separate development consent depending on the extent of works required.

Accordingly, it would be appropriate for Council to defer determination of the DA pending the applicant lodging further information in relation to contamination on the site, including a Detailed Site Investigation Report and if required a Remediation Action Plan.  Once these documents are lodged, Council could then assess them and if required determine the DA by imposing a condition for the Remediation Action Plan to be implemented and appropriate validation carried out by a site audit.



THAT Development Application No. DA/633/2016 for demolition of existing structures and subdivision of six lots into 13 lots in three stages and including two Torrens title lots and 11 community title lots, at Lot 16 DP 608064, Lot 12 DP 236455, Lot 29 DP 587660, Lot 2A DP 354709, Lot A DP 356749, Lot 3 DP 531091, No. 2A and No. 6 Judith Avenue and Nos. 589, 591, 591A and 593 Pacific Highway, Mount Colah be deferred to enable the applicant to submit:

1.         Further information in relation to contamination on the site, including a Detailed Site Investigation Report and if required a Remediation Act Plan.

2.         The additional information should include, but not be limited to, confirmation of the extent and volume of contaminated material on the site, proposed method of management and remediation, confirmation of the finished landform after remediation and evaluation of the environmental impacts of the proposed method of remediation.





Rod Pickles

Manager - Development Assessment

Planning Division




James Farrington

Group Manager

Planning Division





There are no attachments for this report.


File Reference:           DA/633/2016

Document Number:    D07332653