Commercial site investigation data and classification report

PROPOSED NEW BUILDING INVESTIGATION
1. Introduction

CSI Soil Testing was commissioned by HR Design Group Consulting Engineers to conduct a
Geotechnical investigation to determine the indicative sub-surface foundation conditions of the
proposed building site. A site classification in accordance with AS 2870 has been conducted, although
it must noted that this standard may not apply to a non-residential building, in which case Design for a
Commercial (non-domestic) site should be carried out by Engineering Principles.

This report should be read in full and kept together at all times.

2. Site conditions:

The area is well grassed. The general area slopes at approximately 3% in an undulating area. The
design engineer should be aware of the presence of trees on or near the site and that they may have
an effect on the performance of the footings/slab, whilst in place and after removal. The design
engineer should take all considerations and satisfy themselves in this regard.

3. Field Work:

Boreholes with continuous flight augers (BH)
Dynamic Cone Penetrometer (DCP)
Pocket penetrometer (PP)
Sampling
Site observations

4. Soil Assessment and Groundwater:

The bore logs of the site indicate that the soil profile consists of a SILTY/SANDY CLAY FILL over CLAY
FILL over CLAY. No groundwater was found during the time of the investigation.

The design engineer should be aware of possible unusual moisture conditions caused by open
stormwater channel behind the rear boundary and that this may have an effect on the performance of
the footings/slab. The design engineer should take all considerations and satisfy themselves in this
regard.

5. Laboratory Testing:

Samples were taken on site at the time of drilling of the sub-surface clay strata. U50 tubes were used to
obtain an undisturbed sample. This is used to gain a pocket penetrometer reading estimating Allowable
Bearing Capacity (qa) and for Shrink/Swell testing to determine an estimated reactivity (Iss) of the clay
which in turn assists in determining the predicted surface movement of the soils due to seasonal
moisture changes. It must be noted that a sample is a very small snapshot of the whole site volume.
Soil conditions can change rapidly over a very short distance, both vertically and horizontally, and with
variations caused by time and developments. Results are therefore used a guide in determining the
whole foundation conditions of the site. Other factors used may be local knowledge, nearby
investigations, reports of other reputable geotech companies and the visual and tactile observations on
site at the time of investigation.


CSI: 12186Lot5TaylorCourtCooroy

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