06/0159 - Op Works - landscaping, Driveway and Stormwater [As Published] · 142006.159

15/12/2005 10:47 61-7-54441158 RIENMAC PTY LTD SCST PAGE @3

RIENMAC envio CONSULTING ENGINEERS
CIVIL AND STRUCTURAL

-2-

We recommend a soil raft be created to support the structure which would undergo uniform
consolidation under the load. We understand the proposed development is two storeys with a
suspended concrete slab and a slab on ground. We recommend the building area be excavated to
1200mm below present surface level which removes all the fill material and the remnant top soil
layer. At this depth generally a medium dense saturated sand layer should be found. A sheet of
Tensar Geogrid Geofabric should then be placed covering the entire building are. A layer of CBR15
material should then be placed on top of the geofabric to a depth of approximately 300mm
compacted in layers. Any clean sand recovered from the excavation may then be placed in
compacted layers on top of this material to the required level. Shallow footings may then be placed
in this material designed for a safe bearing capacity of 100kPa. All the strip footings should be tied
together to prevent differential settlement. Our preliminary foundation plan for the proposed
development is shown on our drawing 98425-SI, which also outlines our required earthworks
procedure.

We consider this site has a class classification in accordance with AS2870 "Residential Slabs and
Footings".

If you require any further information or clarification regarding this report please do not hesitate to
contact us.

Yours faithfully,

? ConA

PETER RIENECKER