Development Application Part 2 of 2 Planning report Geotechnical report and plans MCU11/0168 & OPW11/0257

GeoConsulting. Report 115988, July 1 1                                                              Page 11
Lot 34 Marcus Dues Court, Marcus Beach


levels. Foundations are to be augmented by structural design. This is required to negate differential
movement especially as the basement is to be cut into the flank.


6.8      Septic a Sullage Disposal
All effluent and sullage discharge should be in accordance with the relevant local authority. A sewer
manhole was noted below the retaining wall and to the northeastern allotment corner.


6.9      Erosion Control £t Landscaping
Prior to construction, an erosion and sediment control plan should be established. This document can be
referenced to the publication, Soil Erosion and Sediment Control (EA 1996).


6.10     Construction Recommendations
The proposed two-storey residence with basement (consisting of slab-on-ground base, with suspended
floors) is considered suitable for this allotment. However, we would recommend engineering design
consider the preparation of the basement slab/footing as the key structural element.


6.11     Surface Movement and classification
in accordance with AS 2870, the site is classified "P" (soft soils).


6.12     Plumbing
Penetrations of the footing beams shall be avoided, but where necessary shall be sleeved to allow for
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movement. Closed-cell polyethylene lagging a minimum of 20mm thick shall be used around all
stormwater and sewer pipe penetrations through external footings. Further, connections of stormwater
and waste drains shall include flexible connections.


6.13     Site Maintenance
Long-term stability of the house foundations is the responsibility of the owner/occupier of the
dwelling. Large changes in moisture conditions around the structure's footings (inconsistent watering
patterns), will cause movement, and may lead to damage of the house. Further, trees are to be planted
away from the structure area in order not to adversely affect the foundation performance. You are
advised to read the report, Foundation Maintenance and Footing Performance: A Homeowner's Guide,
(CS1RO 2003), a copy of which is attached as APPENDIX C.


6.14      Consideration to Tree Planting
                                                                                                              1
A zone of drying influence is associated with single trees or groups of trees under consideration. The
site classification and foundation design for this project has been based on the assumption that the
design will NOT be subject to any zone of drying influence produced by trees. AS2870-201 1 Appendix
H (informative) may be referenced as a guide for determining the influence distance of trees. Based on
this appendix, single trees are to be planted a minimum distance of 1.0 times HT (mature height or an
estimate of the height it will attain within the design life of the building) away from the structure. A
group of trees are to be planted a minimum distance of 1.5 times HT9 (0.9 times the design height of
the tallest tree) away from the structure. For a group of four or more trees in a row the trees are to be
planted a minimum distance of 2.0 times HT9 away from the structure.

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