07/1571 - Response to Information Request [As Published] · 142007.1571

Project 305-2325

 

 

 

 

   
 

 

 

 

 

 

 

 

February, 2006 su oe 7 "Page §
QUANTITATIVE TEST RESULTS SUMMARY
Sank =e
0
BH1 2.5 - 2.75 0.01 0
BH2 1.0.- 1.25 0.01 0
BH2 1.5-1.75 0.00 0
BH3 1.0-1.25 0.00 0
BH3 2.0 - 2.25 0.01 0

 

 

 

 

 

 

5.0 GEOTECHNICAL MODEL

The subsurface profile encountered in the boreholes consisted of fine to medium grained
sands to depths of 9.5m (BH3) and 10.6m (BH1). The profife of sand density varied
between the borehole locations. Borehole BH1, located adjacent to the beach, consisted
of loose sand, becoming medium dense at a depth of 7.6m. Borehole BH3, located in the
south-eastern carpark off Hastings Street, consisted predominately of medium dense
sands to a depth of 9.5m.

Stiff sandy/silty clay soils was encountered in borehole BH1 underlying the deep sand
profile, to a depth of 17.45m. In borehole BH3, hard sandy clay was encountered
underlying the sand profile and continued to a depth 11.0m.

Extremely weathered sandstone was encountered underlying the stifffhard clays. The
strength ‘of the sandstone was extremely weak, with bands of residual clay soils
interbedded. Standard Penetration Test (SPT) results within the extremely weak and very
weak sandstone, ranged between N=15 and N=33. SPT refusal was achieved at 20.2m
depth in BH1 in very weak sandstone.

A summary of the subsurface profile is presented in Table 2 with detailed borelogs
included at the rear of this report.

 

#% SOIL SURVEYS ENGINEERING