Changes Application - MCU15/0023.02

Project No. 112-14608
January, 2013     REF: 1-14608, 2013-01-15, BR VER O.                                           Page 9

              Depressions formed by the removal of vegetation, underground elements etc. should
              have all disturbed weakened soil cleaned out and be backfilled with compacted
              select material.

              The insitu soils, where free of organic and deleterious material, may be used for
              structural fill provided the moisture content of the soils on placement approximates
              the optimum        moisture   content   required   for compaction.   This   may require
              conditioning to bring the soils to optimum.

              Imported select fill material, if required, should be a good quality select fill material
              with a soaked CBR >10% and a maximum aggregate size of 75mm.

              Fill placed in the area of the building should be compacted in layers (approximately
              200mm loose thickness) to a density not less than 95% of maximum dry density in
              accordance with AS 1289 5.1.1 (Standard Compaction).

              Field density testing should be carried out to check the standard of compaction
              achieved and the placement moisture content. The frequency and extent of testing
              should be as per guidelines in AS.3798-2011, Section 8.0.

              The soils encountered on site (to borehole depth) should be within the excavation
              limits of a small dozer (eg. Cat D4 or similar) in bulk earthworks and a medium sized
              backhoe (eg. Case 580 or similar) in trench excavations.


   4.3       Excavation Stability

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

         •    Batter angle not greater than 1V:2H above the 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:3H is
              recommended and berm width are to be strictly maintained.




                                                                 :#. SOIL SURVEYS ENGINEERING