Weier Group geotech · MCU17/0523

APPENDIX 2: SPECIFICATION FOR PLACEMENT OF FILL MATERIAL

Where the proposed development is to be supported on fill material that is placed after the completion of the site testing, then the fill shall be
placed in accordance with the following recommendations.

1. The site is to be stripped of all vegetation and all topsoil containing grass or trees roots. Following striping of the site, the building platform
is to be compacted and proof-rolled to ensure that no loose material is present on the surface. If necessary, any material which cannot be
adequately compacted shall be removed, then replaced with a suitable material which can be compacted to the standard specification.
2. Footing Beams at Edge of Slabs (beams supporting load-bearing walls, external walls or roof loads) shall be supported as follows:

(a) Beams shall be founded at least 100 mm into the specified foundation material and not less than 300 mm below the finished surface.
Where the depth of fill is too large, it may be more economical to support the beam son mass concrete piers, founded 200 mm below the original
surface on a sound foundation (either dense sand, firm clay or decomposed rock). The piers shall be either:

e 450mm diameter, bored with the Bobcat, and located under all corners of the edge beam and at 1800 mm maximum centres
between, or

e 1000 mm long x full trench width, excavated with the backhoe and located under all corners of the edge beam and at maximum
3000mm centres between.

(b) Alternatively, the Footing Edge Beam may be founded on “Controlled Fill” as specified in Note 5 below.
3. Strip Footings shall be supported either:
(a) min. 100 mm into natural undisturbed material with an allowable bearing capacity of at least 100 kPa, or
(b) For Class “‘A’ and Class ‘S’ sites only, on “Controlled Fill” as specified in Note 5 below.
4. Footing Slabs, Internal Beams and Load Bearing Support Thickenings shall be supported either:
(a) min. 100 mm into natural undisturbed material with an allowable bearing capacity of at least 50 kPa, or
(b) on “Rolled Fill” as specified in Note 6 below.
Compaction Standards for Fill Material
NOTE: All fill material shall be clean and granular and free of organic matter.
5. Controlled Fill
(a) Sand Fill up to 800 mm deep, placed in maximum 300 mm layers and compacted with a vibrating roller to achieve a minimum Dynamic
Cone Penetrometer reading of 7 blows per 300 mm penetration (refer AS1289.F3.3). Sand fill may be flooded if necessary to achieve this

compaction standard, provided the moisture can be subsequently drained from the site.

(b) Non-Sand Fill up to 400 mm deep, placed in maximum 150 mm layers and compacted with a mechanical roller. Clay fill should be moist
during compaction.

(c) Controlled Fill shall continue for at least 1 metre past the edge of the footing beam and shall be battered back to the original surface with a
slope of no more than | : 2 (Vert : Hor)

(d) Where the depth of fill material exceeds that specified above, the fill material shall be compacted as follows:
e Sand Fill - to 65 % Density Index — AS1289.E7.1
e Non-Sand Fill - to 95% Maximum Dry Density (‘Standard Compaction) — AS12891.E4.1

Compaction tests shall be carried out on each layer as fill is placed. If the compaction standard specified is not achieved, then a “Pier
and Slab” and ‘Pier and Beam” footing design will be required with all pairs founded on the underlying natural material.

6. Rolled Fill
(a) Sand Fill up to 600 mm deep, placed in maximum 300 mm layers and compacted by repeated rolling with an excavator.
(b) Non-Sand Fill up to 300 mm deep, placed in maximum 150 mm layers and compacted by repeated rolling with an excavator.
(c) Where the depth of fill material exceeds that specified above, the fill material shall be compacted as follows:
e Sand Fill - to 65% Density Index — AS1289.E7.1
e Non-Sand Fill - to 95% Maximum Dry Density (Standard Compaction) — As 1289.E4.1

Compaction tests shall be carried out on each layer as fill is placed. If the compaction standard specified is not achieved, then a “Pier
and Slab” and ‘Pier and Beam” footing design will be required with all pairs founded on the underlying natural material.