07/0604 - Operational Works - Landscaping, Earthworks, Access & Frontage [As Published] · 142007.604

61 7 54441153
25/10/2086 11:36 61-7-544411598 RIENMAT-S COAST PAGE Gt

SUNSHINE COAST OFFICE:
SUITE 5, FIRST FLOGA,

  

CNR. ELANORA OR & BA LANE o.,
Bien AG perv rp Ca eae OLD. 8887
A.C.N. 040 866 430 TELEPHONE: (07) 5478 2500
A.O.N. $2 010 665 430 FAX: (07) $444 1158
E-MAIL: rlanmac@hotkey. not. av
“KER RO. BOX 143
MIE. Aust CONSULTING ENGINEERS 1
AL. RIENECKER 3E MIE. net CIVIL AND STRUCTURAL MOOLOOLABA, QLO. 4557
25 October, 2006
The Manager
Calty Constructions Pty Lid
PO Box 926

MAROOCHYDORE QLD 4558

 

ATTENTION: GORDON CLEMENTS
Dear Sir,

- “SIDENCE AT 20 BAYVIEW DRIVE, LITTLE COVE FOR MUSTER,
a.ef No, 262141

At your request, an Engineer from this office visited the above site on the 20 Cictober, 2006. The purpose of thy
visit was to offer advice on the stability of a boulder retaining wall to the soutt: west of the existing residesice

The boulder wall was adjacent an existing deck of the residence and was 2 to 3m high at some locations. ‘The
wall was of typical boulder wall construction with large boulders placed one on top of the other. We consider
for a wall of this height constructed with free draining material behind, and built with a | in 4 lean back inte the
cut. the base rocks should be minimum of 1100mm wide and embedded a minimum of 400mm into the ground.
‘That is, the front of the wall should have a minimum of 400mm depth of sound competent material or concrete
above the base of the rock to prevent the wall sliding.

In many cases. this wall had no material in front of the rocks and in fact some of the material had been washed
away from in front of the wall leaving the boulders perched out of the ground.

We consider this wall requires urgent repair work to ensure the stability of the wall. Because of limited access,
this work will be quite difficult. To construct a concrete toe (or similar) in front of the wall socketed inte roch

prevent the wall sliding, would be extremely difficult due to the depth at which rock is likely to be
-gcountered, the closeness of the wall to the existing structure and the Jimited access to the area.

We consider the most effective solution to the problen) would be to reconstruct the wall as a series of temuces
away from the existing residence. The existing boulder wall would be removed and this area benched ont tame
to give adequaie working space to allow a new boulder wall to be constructed. To reduce the height of this w.
a further ane ar two walls may he constricted as a terrace situation with each wall set back suffice: :
not to surcharge the lawer wall. If this is the solution to be adopted, survey information te obiah. accurabe
levels is required and svils information to design the wall.

  

 

We consider this wall requires urgent attention. If you wish to discuss any of the above matters do not hesitate
to contact us.

Yours faithfully. .
PETER RIENECKER

2621.41 -Muster Pays Loe |

 

OFFICE LOCATION: SUNSHINE COAST GOLD COAST