Geotechnical Report Dec 2013 Revision 1

                             55 LAKE MACDONALD DRIVE, COOROY


        INTRODUCTION
This report details the results of a geotechnical investigation carried out for a proposed 31 lot residential
subdivision at 55 Lake MacDonald Drive, Cooroy. The geotechnical investigation was undertaken by Tectonic
Geotechnical Pty Ltd (Tectonic) for Kalkev Pty Ltd, at the request of Callaghan & Toth Consulting Engineers
(C&T).

The geotechnical investigation comprised excavation of test pits, drilling of boreholes and subsequent
laboratory testing. This report summarises the results of the investigation, and provides recommendations
regarding:

    Preliminary stripping depths for road and allotment fills (based on test pits and general site observations);

    Preliminary pavement design parameters (i.e. CBR values based on laboratory testing, field testing, and
     presumptive values based on subgrade types);

    Traffickability of excavator working in the gully (to clear vegetation and for placement of rock spalls and
     geotextile); and

    Sewer and stormwater pipe laying conditions (i.e. excavatability; foundation suitability).



        PROPOSED DEVELOPMENT
The proposed development will comprise the subdivision of existing Lot 136 on MCH978 into 32 new
residential allotments, as shown on C&T Drawing No. 1225-30 (attached in Appendix A). The subdivision
comprises four Stages. Stage 1 consists of four lots (Lots 1 to 4) currently under construction, and Stage 2
consists of three lots (Lots 5 to 7) fronting Wilgee Court. This site investigation encompasses two stages,
designated as Stage 3 (located over the western half of the site) and Stage 4 (located over the eastern half of
the site). Stage 3 comprises16 new lots (proposed Lots 16 to 31), and Stage 4 comprises nine lots (proposed
Lots 8 to 16). The two Stages are separated by proposed park land over an existing drainage gully line.

Access to the Stage 3 allotments will be from a new road off Blue Wren Place. Access to Stage 4 will be via a
new road, Masonry Street, entering the subdivision from the north. Proposed Lots 5 to 7 will be accessed by
new driveways off Wilgee Court. Those driveways cross an existing table drain adjacent Wilgee Court.

The sewer line and manholes have been installed in Stage 4 in the eastern side of the stage (i.e. near the
central drainage gully).

It is proposed to raise the ground levels for the new lots about 500mm above the Q100 Inundation line, which is
shown on the C&T drawing in Appendix A. That results in required filling of about 600mm across proposed
Lots 16, 18, 19, and 28 to 31 in Stage 3, and Lots 13 to 15 in Stage 4. Filling in the order of about 1m height
may be required for the new access road into Stage 3.

We also understand that the proposed works may include rehabilitation of the existing drainage gullies, which
may also serve as stormwater detention basins. Those works comprise regrading of the invert of the existing
drainage gully, placement of an approximate 300mm thick layer of rock spalls, jute matting, topsoil and mulch.
The exact scope of rehabilitation works had not been finalised at the time of this investigation.

        SITE DESCRIPTION
The proposed development site is a 60ha parcel of land described as Lot 136 on MCH978 (No. 55 Lake
MacDonald Drive, Cooroy). The site has limited road frontage along Lake MacDonald Drive along the
southern boundary, and Wilgee Court on the eastern boundary. The remainder of the site is bounded by
existing residential subdivisions or rural lots along the northern, eastern and western sides.

Stage 4 comprises gently sloping ground (less than 5º) to the south-west towards the drainage gully that
traverses the site in a south to north direction. Stage 3 consists of a gently sloping northerly trending ridge
(about 5º to 7º), with gullies located on the eastern and western sides.




2 December 2013
Report N0. 13008-001-Rev1                               1