Attachment 3 - Geotechnical Report

LOT 21 (16) PINES ROAD, COOROY EBIS REFERENCE NO: 210417-SU/GEO

Drainage lines should be installed to direct roof water to appropriate discharge points.
Level spreaders, energy dissipaters and other forms of scour protection will be required at all
drainage outlets.

Subsurface disposal of collected stormwater is not permitted due to the potential for
contributing to slope instability and the reactive nature of the subgrade material.

5.5 Onsite Waste Treatment & Disposal

EBIS has undertaken testing report and design for onsite effluent treatment and disposal
and the siting of the land application area will not cause adverse effects to slope stability.

 

Figure 7 Proposed location of onsite effluent disposal area

6.0 SUMMARY & CONCLUSIONS

EBIS has undertaken the design for development to provide a very low risk of instability and
to have a safety factor of greater than 1.5.

Having given due consideration to all relevant issues including access, topography,
geological conditions and drainage, the proposed location of the dwelling on the site is
considered to be appropriate.

In accordance with the General Land Use and Development on steep land, due regard has
been given to the proposed building, and foundations. We have also assessed the surface
drainage and stormwater system (see drawing No: A3-210417-DW1) and sewage disposal
(see our onsite effluent disposal report 210417-ED and plans A3-210417-ED1 and consider
these will not adversely affect the site stability of this site and adjoining allotments.

It is advisable that a final inspection and evaluation of the site works including cuts/fills
retaining walls and surface and subsurface drainage systems be undertaken by a competent
person. This is to ensure general compliance to the above recommendations and sound
building practices on steep and sloping sites.

Ye

BE. (civil), CP. Eng, MALE. Aust, RP.E.O. No. 4177, Vic EB 19910

PROPOSED NEW RESIDENCE PAGE 10 OF 10 15 February 2022