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

a .
e ' Project 305-2325
February, 20067 ~~ sate - wee - “Page 9

6.2.4 Batters

 

 

The following general recommendations are made for short term stability of batters for
bulk excavation of the site.

* Batter angle not greater than 1V:2.5H from horizontal.

* Top of batter to be a minimum of 2.0m inside any boundary line, in addition to 3.0
metres distance from any building or structure.

* If batters are to be left untreated for any length of time, a batter angle of 1V:2.25H is

recommended and berm width are to be strictly maintained.

If seepage is encountered in the batters, slumping will occur. If seepage is not controlled,
‘slumping to angles half that described above (and flatter) is expected.

Inspection of batters should be carried out by a geotechnical engineer from Soil Surveys
Engineering, during bulk excavation works, to confirm the stability of temporary batters.

' 6.3 Building Foundations
6.3.1 Site Classification

While a site classification in accordance with AS.2870 ‘Residential Slabs and Footings’
relates to residential type construction and is not directly applicable for this development,
it is, however, a valuable method of classification.

Given the investigation drilling encountered predominantly sandy soils only, which are

non-reactive to variations in soil moisture, the site is classified as “Class A“ in

, accordance with AS.2870.1-1996 ‘Residential Slabs and Footings’. While no surface

: - movement would be expected due to changes in moisture, some settlements would be
expected due to the underlying loose sand layers at depth.

Settlement of less than 20mm (maximum) has been estimated for the encountered
subsurface profile. Potential differential settlement would typically be in the order of 25%
to 50% of the total settlement. This settlement would be expected to occur as elastic
settlement as the construction loads are applied.

It is recommended that the designers satisfy themselves that the use of AS.2870 is
applicable for the proposed design.

 

YF SOIL SURVEYS ENGINEERING