J001783-001-R-Rev1

Ashley and Caroline Hermes


    5.2 Subsurface conditions
The general subsurface profile encountered in the test pits comprised:

     Topsoil: comprising low to high plasticity silty clay to depths of between 0.1 m to 0.2 m below ground
      level (BGL).

     Colluvium: comprising medium plasticity, stiff to very stiff gravelly sandy clay to 0.6 m depth in TP1.

     Residual Soils: comprising medium to high plasticity, firm to hard silty/sandy clay to depths of 1.0 m
      and 2.0 m BGL; underlain by

     Extremely Weathered Material: comprising low to medium plasticity, hard silty/silty clay to 1.2 m BGL;
      in TP1; underlain by

     MUDSTONE: very low to medium strength, highly weathered, thinly laminated mudstone, encountered
      at depths of 1.2 m (TP1) and 2 m (TP2), and continuing to practical excavator refusal.

     Practical excavator refusal was encountered in rock (mudstone) in both test pits.
DCP tests (DCP1 and DCP2) were completed in the proposed pool footprint and the southern extent of the
proposed residence footprint as shown on Figure 1.
Groundwater was not encountered in the test pits, however, seepage may occur at the soil/rock interface or
through fractures in the rock following periods of prolonged rainfall.

    5.3 Topography
The proposed development site is on a small convex ridge generally sloping approximately 7° to 15° towards
the northeast. Slopes of approximately 20° were observed to the north of the development footprint (along
the northern side of the ridge) and 12° to the south. Slopes of up to 20° to 25° were observed directly
upslope of the proposed western retaining walls (adjacent to the proposed garage).
Ground surface contours and slope angles were measured on site with a handheld clinometer.

    5.4 Surface Drainage
Surface drainage appears to be good, with runoff expected to be directed downslope toward the north and
south of the proposed footprint. To ensure that surface water from the building envelope and the remainder
of the site does not traverse the driveway, adequate drainage should be installed to divert water flow.

    5.5 Vegetation
At the time of our investigation, the proposed residence footprint was cleared of all trees and predominantly
covered in grass.
Remnant natural vegetation (including large mature trees) is present to the west (upslope) of the proposed
footprint. No significant signs of tilting (a possible indicator of ground movement) were observed in the
existing vegetation.

    5.6 Buildings, Other Structures, etc.
No existing buildings or structures were present in the proximity of the proposed footprint.




J001783-001-R-Rev1