Geotechnical Report Dec 2013 Revision 1

                                  55 LAKE MACDONALD DRIVE, COOROY


where DCP blows >1 per 100mm were also recorded at depths of about 0.5m BGL. Therefore, at HA1 and
HA2, the silty clay may actually be stiff from 0.5m BGL (DCP testing in wet silty clay can give low values that
underestimate the strength of the material).

Groundwater seepage was only encountered in test pits TP8 at a depth of 0.3m BGL and at TP10 at a depth
of 1.4m BGL during the investigation. Groundwater was present in boreholes HA1 and HA2 at about 0.2m
BGL. It should be noted that groundwater seepage may occur from more permeable horizons within the soil
following periods of prolonged or heavy rainfall.

Refer to detailed test pit reports and explanatory notes attached in Appendix B.

5.3        Laboratory Test Results
The results of the laboratory testing are presented below in Table 1.
Table 1: Summary of Laboratory Results
 Test Pit No.                                      TP1                  TP2          TP7                 TP9

 Depth (m)                                       0.2-0.3               0.3-0.5      0.3-0.7            0.3-0.5

 Percent fines (%)                                  46                   46

 Liquid Limit (%)                                   23                   29

 Plastic Limit (%)                                  17                   16

 Plasticity index (%)                                6                   13

 Linear Shrinkage (%)                               4.5                 10.0

 CBR (%)                                                                             17.0                19.0

 Field Moisture Content (%)                                                           9.5                18.1

 Optimum Moisture Content (%)                                                        12.7                16.5
Fines Content is the % of clay/silt fraction in the soil profile

The above laboratory test results indicate that the soil tested from TP1 is silty sand, with low liquid limit silt. .
The sample tested from TP2 is clayey sand, with low plasticity clay.




2 December 2013
Report N0. 13008-001-Rev1                                          9