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ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180 -
REFERENCE DOCUMENT
A: 1/9 Greg Chappell Drive, MCU20/0084
NOOSA COUNCIL
Burleigh Heads, QLD, 4220 15 OCTOBER 2020
-
protestengineering.com
328 Upper Pinbarren Creek Road, Pinbarren Project PTP/03729
RPD: Lot 3 on RP851976 Number: PTP/03729 – 0001 – Rev1
Area: 256,500m2 Project Name: Access Review
Regulatory Authority: Noosa Shire Council
INTRODUCTION
This letter report outlines the design advice with relation to the existing access routes through site, relating to
access to the proposed ‘Mango Cabin’. This assessment is in response to comments received from Noosa Shire
Council requesting a review of site access to ensure that visitors access to the proposed Cabin is ‘safe’.
The scope of this report is to provide an assessment and recommendations for the client (where required) to
improve the existing access track to provide safer access to future Cabins proposed for the site.
Figure 1 – Contextual Site Location (site location bordered blue)
SITE SETTING
The site is located on a on a hillside. The area is well vegetated, with the site containing a number of existing
ponds and water features (some of which overflow over the existing access road in flood events). As per Figure
1 above, it is evident that the much of the site forms part of naturally valley. Figure 2 below, shows a site profile
traced along the access road to the location of the proposed new cabin.
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/02903 8 April 2019
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Page 2
Page 2 of 5
B
V
A
V
B
V
A
Figure 2 - Elevation Profile through site (based on 1m LIDAR data). A marks site access from Upper
Pinbarren Road; B marks proposed cabin; Star marks bridge over creek; ‘Red Line’ marks steep access
location
Figure 2 above shows the access from Upper Pinbarren Road, typically graduates up as you progress into the
site, with one particular section where grades are approximately 40% (1 : 25) (highlighted in Figure 2 above). In
addition there is one creek crossings, via a level crossing north of the caretakers house where a spillway overtops
from the pond. Note, access to the site will be via the existing easement (highlighted green on Figure 1).
Access Road Assessment
The existing condition of the access road has been assessed in general accordance with Noosa Shire Councils
Development Guidelines, Institute of Public Works Engineering Australasia (IPWEA) and QUDM. The purpose of
this assessment is to provide recommendations to improve access for the purposes of site visitors (who may not
be familiar with the sites hazards or non 4WD vehicles). This assessment provides a number of
recommendations to improve site access and general traffic safety for purposes of supporting the proposed
Cabin on the site. The key items to be address are as follows:
1. Poor Signage of general site hazards and conditions (i.e. speed, spillway, flood flow depths at
creek crossings etc.)
2. Narrow roads with no designate passing bays
3. General rutting and poor drainage
4. Grade
Table 1 below summarises these features and some recommended remediation strategies. The evidence and
recommendation in Table 1 have been informed by 2no site visits by a Civil Engineer RPEQ on the 16.08.2019
and 17.09.2019, review of Queensland Globe and consideration of Noosa Shire Councils Development
Guidelines.
PTP/03104 – Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 3
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 1/9 Greg Chappell Drive,
Burleigh Heads, QLD, 4220
protestengineering.com
FEATURE CHAINAGE DESCRIPTION REMEDIATION/WORKS IMAGE
Access General Rutting of the road and Regrade access road, provide 2.5% crossfall
Drive evidence of poor drainage to improve drainage. Formalise table drains
Heavy rutting noted in places.
where required. Resurfacing and grading
Where evident regrade and
required in places with 100mm crushed cover with 100mm compacted
stone. road base.
(Note: It is understood that the client
undertakes regularly maintenance of the
access roads as and when required)
Spillway +460m Evidence that there is Provide a concrete lined spillway channel to
Crossing erosion when pond prevent erosion and provide better access. Form concrete lined ‘v’
overtops and crosses the Spillway apron should be approx. 5m wide spillway.
access road. Flows 150mm thick N32 concrete with SL82 steel
evident to cause soft mesh reinforcement with 50mm cover.
ground and may cause Concrete base to have slip membrane and
difficulty for smaller cars min 300mm thick layer of compacted Type
to pass. No flow depth 2/3 gravel laid on geotextile.
indicator to warn drivers Spillway to be formed to ‘V’ channel profile
of flows over road. to min 3.3% section falls and min 2.5% cross
fall to downstream side to direct channel
flow. Provide rock armouring upstream and
downstream of min D50150mm rock 1m
either side of spillway.
Provide Flow Depth indicator and Spillway
Warning sign
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/02903 8 April 2019
Page 4
Page 4 of 5
Access +490m Access road does not Provide signage for site users that access
Drive permit passing. upto Mango Cabin is single lane access
(Junction)
Access +570m Access to Mango Cabin is Regrade steep section to 1:4 (25%). Regrade
Drive steep (circa 40%). Poor access road with 2.5% crossfall falling
drainage and evidence of towards the west (left hand side). Formalise
both erosion and rutting table drain on right hand side to intercept
overland flows from upper fields. Access to proposed cabin
PTP/03104 – Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 5
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 1/9 Greg Chappell Drive,
Burleigh Heads, QLD, 4220
protestengineering.com
CONCLUSION
All works detailed above should comply with following general guidelines for both construction and
maintenance:
• IPWEA Drawings RS056
• General Information on the Construction and Maintenance of Vehicle Crossovers on Council Controlled
Land
• Queensland Urban Drainage Manual (QUDM) for the design and construction or rural table drains and
culverts
It is considered that the should the property owner implement the above strategies, continue to maintain clear
site lines, and general road conditions (in accordance Australian and local council guidelines), the vehicular site
safety can be improved for visitors and users of the site.
We trust this information is satisfactory for your current needs. Should you have any questions, please feel free
to contact the undersigned
Protest Engineering
Ryan Hofman
Senior Civil Engineer
BEng (Hons) CPEng CWEM RPEQ 21643
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/02903 8 April 2019
Page 6
Page 6 of 5 PROTEST ENGINEERING Synergy // Efficiency // Productivity PTP/03104 — Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 7
-
REFERENCE DOCUMENT
MCU20/0084
NOOSA COUNCIL
15 OCTOBER 2020
-
CD:JM 20507
14 February 2020
328 Upper Pinbarren Creek Road
PINBARREN QLD 4568
ATTENTION: Property Owners
RE: 328 UPPER PINBARREN CREEK ROAD, PINBARREN – PROPERTY BRIDGE – LEVEL 3
REPORT AND CERTIFICATION
TOD Consulting were engaged by the property owners, at the time of inspection, to carry out a
Level 3 investigation for the structural condition of an existing bridge, on the property of 328 Upper
Pinbarren Creek Rd. TOD Consulting carried out a Level 3 inspection on 30 January 2020.
Conclusion: Bridge to be load limited to 7.5 tonnes allowable gross vehicle mass (GVM) for a
maximum of 2 years (until January 2022). If the bridge shows any concerning behaviour before this
date, please contact a bridge engineer for advice immediately. The bridge shall be subjected to a
Level 3 inspection and re-rated on/before 30 January 2022.
Bridge Details: The timber girder bridge is comprised of two spans and is continuous over the
middle pier support. The overall deck dimensions are 12.8 metres long (nominal) x 2.9 metres
clear width between kerbs. Span 1 is 5.9 metres and Span 2 is 6.0 metres between the centre of
supports. The two abutments and one pier are constructed in concrete, where the extents are
unknown. The bridge carries two directional traffic with one lane of operation.
Original Design Load: The original design load is assumed to have been 30 tonnes allowable
GVM.
It has dilapidated since then, as per the following paragraphs.
Existing Risks: Several built-in risks were identified with the bridge superstructure, including:
• Girder 1 (Span 2 midspan) is in Very Poor condition (Condition State 4) due to vertical
crack at top of girder causing internal rotting/decay of component.
• Girder 2 End 1 (at Abutment A) is in Poor condition (Condition State 3) due to 18% snipe.
• Girder 3 End 1 (at Abutment A) is in Very Poor condition (Condition State 4) due to 23%
snipe and 26% pipe.
Please note that the timber girders were unable to be accessed to be drilled at either side of Pier 1.
Therefore, the Condition States at these points are unknown.
Condition State: In our opinion, the bridge Condition State is 4 (Very Poor).
Document Set ID: 21271534
Version: 1, Version Date: 20/10/2020
Page 8
Current Capacity: Our calculations indicate that the current capacity of the bridge superstructure
is suitable to carry 7.5 tonnes allowable GVM (single axle load must not exceed 3.75 tonnes). The
nature of timber is such that it will continue to dilapidate and lose capacity as time passes.
It is essential to impose a 10km/hr speed limit using signs, to reduce the “bounce” effect of the
vehicle load on the bridge.
Please note that the substructure of the bridge was not assessed during this Level 3 investigation,
as the depth of these supports are not visible. An extensive investigation would be required to
assess the substructure.
Short-Term Recommendations: We strongly recommend the following:
• Installing and maintaining in-ground termite baits near each abutment.
• We consider it essential to install 10km/hr signs at both ends of the bridge.
• We consider it essential to install 7.5-tonne load limit signs at both ends of the bridge.
• We recommend that a Level 1 (visual inspection) be carried out every six months until the
next Level 3 inspection on/before 30 January 2022.
The Level 1 inspection shall be carried out by an experienced bridge technician/builder.
The Level 3 inspection shall be carried out by an experienced bridge engineer.
We are happy to provide detailed designs of repair/replacement works to allow for the bridge to
support a heavier vehicle load, under an extension to the original Agreement. At this preliminary
stage, the repair works is likely to include the installation of larger diameter replacement
girders/logs and load distribution boards under the decking.
Please note that due to the sizes and severity of defects of the existing girders, we suspect that it
would be more cost efficient to replace the existing superstructure rather than undertaking
maintenance on the bridge.
Yours faithfully,
Chris Dowding – R.P.E.Q. 8339
07 5449 9600 | [email protected]
TOD consulting engineers
Document Set ID: 21271534
Version: 1, Version Date: 20/10/2020
Page 9
REFERENCE DOCUMENT
MCU20/0084
NOOSA COUNCIL
15 OCTOBER 2020
-
RF&A
Rob Friend & Associates Pty Ltd
Environmental Land Management Consultants
ABN 83 097 068 114 28 Merton Road
ACN 097 068 114 Woolloongabba Qld. 4102
p - (07) 3891 9131
m - 0419-667346
e - [email protected]
Our Reference - RFA19-039-02
9 August 2020
Ms V Dioszegi
328 Upper Pinbarren Creek Road
PINBARREN Qld 4568
By email: [email protected]; [email protected]
Dear Viki and Clint,
Re: - Bushfire Hazard Assessment Report – 328 Upper Pinbarren
Creek Road, Pinbarren
Rob Friend & Associates Pty Ltd has been asked to undertake an assessment of the bushfire
hazards relative to the development application over the abovementioned subject site.
A site inspection was undertaken on the 8th August 2019 to ascertain the validity of the bushfire
hazard mapping over the property and adjacent properties as mapped in the Noosa Plan
(2006) Bushfire hazard overlay mapping (see Figure 4). We also considered the relevance of
the State Planning Policy (2016) Natural Hazards, Risk and Resilience bushfire hazard mapping
(see Figure 5).
Development Proposal
The property owners under the name of Dioswell Pty Ltd, have lodged a Material Change of
Use (MCU) application (MCU19/0053) for visitor accommodation type 3 rural (3 x 1-bed units)
within the property (see Figure 1)
The location of the proposed visitor accommodation includes, “Old Dairy”, is in the lower
western portion of the property and a new to be constructed cabin, “Mango Tree Cottage”
located in the lower central east of the property.
The Old Dairy is located south of and adjacent to and downslope from a cabinet timber
plantation within the property. the lands to the west and south are cleared and used for
pastoral activity. A dirt driveway traverses to the immediate west of the Old Dairy structure
and services the residential dwelling house to the north of the Old Dairy.
The cabinet timber plantation is was established circa 2001 based on the aerial photograph
interpretation.
Page 10
[2] The Mango Tree Cottage is located in an area which has been used for cattle and horse agistment and is generally clear of understorey shrubs but is grassed with some mature and regrowth canopy trees surrounding the location. In addition, a relatively small area to the north has also been planted for forestry purposes. The date of this planting is not clear from the available aerial photography, however, it is likely based on the height of the trees within this are circa 2000 - 2005 Both structures are accessible via an earthen track and will be serviced by tank water and septic sewage system. Site Description General Description The subject site is located at 328 Upper Pinbarren Creek Road, Pinbarren and described as Lot 3 on RP851976, covering an area of 25.63 Hectares (see Figure 2). The subject site is zoned as Rural under the Noosa Plan (2016). Several existing structures including the landowner’s principal dwelling, sheds and other structures are located within the land. In addition, there are several dams within the property and the entire site is vegetated. The property is accessed via a track/driveway from Upper Pinbarren Creek Road. A number of earthen vehicle tracks traverse the lower elevations of the site which also link to less formal tracks which provide access to the upper portions of the land and Turnbull Road upon the ridge in the northern portion of the land. We note that while there is a track generally located along Turnbull Road, it is gated at the property boundary and unformed for its length abutting the land. All existing farm dams within the property are accessible from the internal track network which, at the time of our site inspection, were trafficable by rural fire fighting appliances. As such, at the time of our site inspection, the regrowth could be considered to be predominantly a notophyll vine forest in terms of its bushfire hazard profile (see Figure 2).
Page 11
[3]
J
Existing,
Dwelling Approved Granny Fiat
House (MCU 19/0053)
als 3
iS
eR
7
S°230067
Formed /
Grove! _ if
Access ~~} /
. Approved Caretaker’s.
ad | (MiCU19/0053)
3, :
O
Site Pick 8
SITE PLAN
Scale 1:3000 (A3)
PROPERTY DESCRIPTION
lot 3 RP 851976
site area 25.65 ha
Seale 1:3000 ~ Lengths are in Metres.
1 4 1 L n L
0 50 100 150 200 280 300
1
350
§
Pv
gS
ys Se
Ns,
“OR
i
ao
SITE PLAN DETAIL
Scale 1:500 (A3)
Fieg: J57 Pinbarren
Project:
Tourist Accommodation
and Work Space
328 Upper Pinbarren Ck. Rd.
Pinbarren
[Glient:
Dioswell Pty Ltd
[Drawing No:
2002.03 sheet 1
(Scale:
as shown
Drawn Date:
18/6/2020
4
400
Figure 1 — Site Plan
Page 12
[4]
Figure 2 – 2008 Aerial Image (Noosa Plan)
Topography
The land occupies southerly aspect slopes of a local ridgeline which has an elevation of
approximately over200 metres with the highest point at 234 metres. The land slopes down
toward Pinbarren Creek Road and Pinbarren Creek which is located to the south of the
southern boundary of the property, (see Figure 3).
The eastern and western boundaries are also generally located on spurs which descend from
the Turnbull Road ridge toward Pinbarren Creek Road.
Page 13
[5]
The land contains two main drainage gullies which drain the land from the Turnbull Road
ridgeline toward Pinbarren Creek. There are a number of instream farm dams within the
drainage gullies which provide water storage for the land.
The surrounding land is clear of woody vegetation and as such does not present a bushfire risk
to the property. A vegetated block is located to the north-west however, this is separated by
land which appears to be maintained.
Figure 3 – Contour Map (Noosa Plan)
Other Infrastructure
The in-stream storages/farm dams are augmented with three metal tanks located on a
western spur above the main dwelling house.
The whole perimeter of the land is fenced with standard stock fencing. In addition, the forestry
plantation is also fenced with 3 strand wire fencing and there is also a three-strand wire fence
above the proposed secondary dwelling which separates a farm dam and minor drainage
line from an old paddock which is currently undergoing natural regeneration of a mix of
Acacia species and rainforest species along with the ubiquitous lantana (Lantana camara).
Page 14
[6]
Figure 4 – Oblique Aerial Photo of Subject Site (Nearmap, 2019)
Vegetation
The land is not mapped as containing remnant vegetation however, much of the property is
mapped as containing mosaics of high-value regrowth vegetation and this includes the
cabinet timber forestry area.
The main portion of the land including the Cabinet timber forestry area is mapped as the
mosaic Regional ecosystem RE12.11.10/12.11.3/12.11.12/12.11.2 (65/20/10/5). A regrowth
polygon of the Regional ecosystem 12.8.13 is mapped over the north-eastern portion of the
land and the south-western portion has a mosaic of 12.3.11/12.3.1/12.3.2 (40/40/20). These
Regional ecosystems are described below (see Figure 6 below): -
RE12.3.1 - Complex to simple notophyll vine forest. Waterhousea floribunda is predominant
fringing stream channels. Other species can include Cryptocarya hypospodia, C.
obovata, C. triplinervis, Argyrodendron trifoliolatum, Ficus coronata, F. fraseri, F.
macrophylla forma macrophylla, Aphananthe philippinensis, Elaeocarpus grandis,
Grevillea robusta, Castanospermum australe and Syzygium francisii. Ficus racemosa and
Nauclea orientalis in north of bioregion. Eucalyptus spp. emergents (e.g. E. grandis) and
Araucaria cunninghamii; less commonly Agathis robusta may also be present. Occurs on
Quaternary alluvial plains and channels. (BVG1M: 4b),
RE12.3.2 - Eucalyptus grandis +/- E. microcorys, Lophostemon confertus tall open forest with
vine forest understorey ('wet sclerophyll'). Patches of Eucalyptus pilularis sometimes present
especially in vicinity of sedimentary rocks (e.g. around Palmwoods). Fringing streams and
in narrow gullies in high rainfall areas. (BVG1M: 8a),
RE12.3.11 - Eucalyptus tereticornis +/- E. siderophloia and Corymbia intermedia open forest
to woodland. Corymbia tessellaris, Lophostemon suaveolens and Melaleuca
quinquenervia frequently occur and often form a low tree layer. Other species present in
scattered patches or low densities include Angophora leiocarpa, E. exserta, E. grandis, C.
trachyphloia, C. citriodora subsp. variegata, E. latisinensis, E. tindaliae, E. racemosa and
Melaleuca sieberi. E. seeana may be present south of Landsborough and Livistona decora
may occur in scattered patches or low densities in the Glenbar SF and Wongi SF areas.
Page 15
[7]
Occurs on Quaternary alluvial plains and drainage lines along coastal lowlands. Rainfall
usually exceeds 1000mm/y. (BVG1M: 16c),
RE12.8.13 - Microphyll and microphyll/notophyll vine forest +/- Araucaria cunninghamii.
Characteristic species include Araucaria cunninghamii, A. bidwillii, Cupaniopsis parvifolia,
Dendrocnide photinophylla, Rhodosphaera rhodanthema, Flindersia australis, F.
schottiana, F. xanthoxyla, Drypetes deplanchei, Olea paniculata, Diospyros geminata,
Gossia bidwillii, Excoecaria dallachyana, Pleiogynium timorense (north of bioregion) and
Vitex lignum-vitae. Argyrodendron trifoliolatum sometimes present especially in subregion
6. Occurs on Cainozoic igneous rocks, especially basalt. (BVG1M: 5a)
RE 12.11.10 - Notophyll and notophyll/microphyll vine forest +/- Araucaria cunninghamii.
Characteristic species include Argyrodendron trifoliolatum, Argyrodendron sp. (Kin W.D.
Francis AQ81198), Backhousia subargentea, Dissiliaria baloghioides, Brachychiton discolor,
Beilschmiedia obtusifolia, Diospyros pentamera, Grevillea robusta, Gmelina leichhardtii
and Ficus macrophylla forma macrophylla. Occurs on Palaeozoic and older moderately
to strongly deformed and metamorphosed sediments and interbedded volcanics.
(BVG1M: 2a)
RE 12.11.3 - Eucalyptus siderophloia and E. propinqua open forest +/- E. microcorys,
Lophostemon confertus, Corymbia intermedia, E. biturbinata, E. acmenoides, E.
tereticornis, E. moluccana, Angophora leiocarpa, Syncarpia verecunda with vine forest
species and E. grandis or E. saligna in gullies. Eucalyptus pilularis and E. tindaliae sometimes
present e.g. mid D'Aguilar Range, Conondale Range. Occurs predominantly on hills and
ranges of Palaeozoic and older moderately to strongly deformed and metamorphosed
sediments and interbedded volcanics. (BVG1M: 9a)
RE 12.11.12 - Microphyll and microphyll/notophyll vine forest +/- Araucaria cunninghamii.
Characteristic species include Archidendropsis thozetiana, Argyrodendron sp. (Kin Kin W.D.
Francis AQ81198), Croton acronychioides, Cupaniopsis simulata, Dendrocnide
photinophylla, Diospyros geminata, Drypetes deplanchei, Ficus virens, Cryptocarya
bidwillii, Planchonella myrsinifolia, Pleiogynium timorense, Vitex lignum-vitae and Vitex
acuminata. In places this RE is actively invading adjacent eucalypt forest in absence of
fire (e.g. Goodnight Scrub). Occurs on Palaeozoic and older moderately to strongly
deformed and metamorphosed sediments and interbedded volcanics. (BVG1M: 5a), and
RE 12.11.2 - all open forest with vine forest understorey ('wet sclerophyll'). Canopy species
include Eucalyptus saligna subsp. saligna or E. grandis, E. microcorys, Corymbia intermedia
and Lophostemon confertus. Characteristic understorey species include Ackama
paniculosa, Pittosporum undulatum, Synoum glandulosum subsp. glandulosum and
Cryptocarya microneura. Occurs on Palaeozoic and older moderately to strongly
deformed and metamorphosed sediments and interbedded volcanics. (BVG1M: 8a)
While no specific vegetation survey was undertaken during the site inspection, the species
observed along the gullies was consistent with the Regional ecosystem 12.11.10 – Notophyll
vine forest.
The cabinet timber plantation should be removed from this Category C mapping as it is clearly
a timber plantation with a number of cabinet timber species such as Gympie messmate
(Eucalypts cloeziana), Crows ash (Flindersia australis), Rose gum (E. grandis), Blue quandong
(Elaeocarpus grandis), Rough-leaved elm (Aphananthe philippinensis) along with some
rainforest recruitments in the understorey.
With regard to other areas outside of the cabinet plantation area, much of this area was
regrowth rainforest species with some old plantings of eucalyptus species and weedy shrubs
and grass species.
Page 16
[8]
Figure 5 State Government’s Regulated Vegetation Management Mapping (Qld Government, 2019)
Historic Aerial photography review
A review of the historic aerial photography over the land was undertaken to understand the
present-day vegetation complex. The findings for this review are provided below: -
1. The Gympie 1974 aerial photograph shows the land completely clear of woody
vegetation with what appears to be, long grass, within the drainage line. This is
consistent with the present-day lands to the east of the property.
2. The Gympie 1984 photograph shows some regeneration in the upper slopes of the land
with much of the mid and lower slopes still dominated by grassland.
3. The Gympie 1993 photograph shows less recruitment in the upper slopes of the site and
some areas returned to grassland. The bottom of the gullies appears to have
thickened.
4. The Gympie 2001 aerial photograph shows significant regrowth in the upper and mid
slopes. The shed structure is visible, and the early stages of the forestry area is partially
visible.
5. The 2009 aerial imagery in the Noosa Intra-mapping shows a continuation of the
regrowth and the advancement of the forestry plantation. Areas along the eastern
side appear to be activity grazed and the current main dwelling house on the western
boundary is evident.
In conclusion, the aerial photography indicates much of the land is undergoing natural
regeneration since the 1990s with the cabinet timber planting being initiate circa early to mid-
2000s.
Page 17
[9]
Based on the pre-clearing regional ecosystems, and the lack of significant vegetation
impacting events such as frequent bushfire event, it is likely that this natural regeneration will
continue toward a notophyll to microphyll vine forest with some emerging eucalypt species.
Bushfire Hazard Mapping
The Noosa Plan 2006 Bushfire Hazard Risk Areas mapping, maps areas of High and Medium
bushfire hazard as well as a potential impact buffer (see Figure 6).
Subject Site
Figure 6 - Noosa Map 2006 Bushfire Hazard Overlay Map
Page 18
[10] The latest Noosa Plan (2020) has adopted the current State Planning Policy, Natural Hazards, Risk and Resilience bushfire hazard mapping. We note that our site inspection indicates much of the vegetation mapped as medium or high bushfire hazard as low due to incorrect mapping of the vegetation within the property. Figure 7 - Noosa Map 2020 Bushfire Hazard Overlay Map
Page 19
[11]
State Planning Policy (2016) Natural Hazards, Risk and Resilience
A review of the State Government’s State Planning Policy, Natural Hazards, Risk and Resilience
bushfire hazard mapping maps different areas of High and Medium bushfire hazard over
the land (see Figure 8).
Subject Site
Figure 5 State Planning Policy (2016) Natural Hazards, Risk and Resilience Map
Findings and Observations
Whole of property
The property is located on a southerly facing land, falling to the south from a ridge over
which Turnbull Road is located. The land is also shaped by spurs which coincide with
the eastern and western boundaries and as such all of the property slopes down
toward the south-western corner of the property.
The land is dominated by regrowth vegetation which is dominated by regrowth
rainforest species particularly in the drainage lines and a number of environmental
weed species including Lantana.
Page 20
[12]
The mapped high-value regrowth mapping is considered to be incorrect in terms of
what’s occurring within the land and particularly the mapping of the cabinet timber
plantation area. a likely scenario, with no significant impacts to the land, is that the
area will transition to a microphyll to notophyll vine forest with Araucaria
cunninghamiana as an emergent.
The land is well serviced with water storages which includes instream farm dams and
metal water tanks.
Underground water pipes also provide access between the tanks and dams as well as
other structures within the land.
A number of earthen tracks are located throughout the property and these tracks
provide direct access to all buildings as well as the northern, eastern and western
property boundaries and Turnbull Road road reserve.
A submerged water pump is also located in the bottom dam which can provide
access for water for rural brigade appliances if and when required.
All structures including the proposed second dwelling house and the proposed Mango
Tree Cottage are surrounded by areas where the understorey and groundcover is
cleared and will be maintained.
Lands to the north, east and west are active cattle grazing paddock and as such would
not carry a significant bushfire. We do note that they may carry a low grass fire which,
depending on wind conditions, may move at a rapid pace over the adjacent lands.
However, as the intensity of the fire moving through the grazed grassland would not be
significant intensity to cause an understorey or canopy fire within the subject site.
Additionally, as the boundaries contain serviced vehicle tracks, these may be sufficient
to stop of a grass fire or reduce the rate of spread as it enters the land and commences
to burn downslope into the property.
A review of the Qld Fire and Emergency Service Redi-portal was also undertaken as
this contains the latest mapping data which informs the current SPP bushfire hazard
mapping. The data from the Redi-portal was then used to calculate the potential
bushfire hazard class of the vegetation around the proposed structures. The outputs
are contained in Table 1 below.
Table 1 – SPP Bushfire Asset Protection Zone Calculator
SPP Bushfire Asset Protection Zone Width Calculator
VARIABLE DESCRIPTION VARIABLE UNITS VALUE
Input Values
FIRE WEATHER SEVERITY FDI 46.00
VEGETATION HAZARD CLASS VHC 2.1 Complex
to simple,
semi-
deciduous
mesophyll to
notophyll vine
- forest
REMNANT STATUS - - Remnant
SLOPE TYPE (UPSLOPE OR DOWNSLOPE) ST - Downslope
EFFECTIVE SLOPE UNDER THE HAZARDOUS VEGETATION eSlope degrees 6.00
SLOPE BETWEEN SITE AND HAZARDOUS VEGETATION θ degrees 7.00
DISTANCE OF THE SITE FROM HAZARDOUS VEGETATION d m 32.00
Output Values
SURFACE FUEL LOAD - t/ha 3.50
NEAR SURFACE FUEL LOAD - t/ha 0.00
Page 21
[13]
BARK FUEL LOAD - t/ha 0.00
ELEVATED FUEL LOAD - t/ha 0.00
TOTAL OVERALL FUEL LOAD W t/ha 3.50
TOTAL SURFACE FUEL LOAD w t/ha 3.50
POTENTIAL FIRE LINE INTENSITY I kW/m 0
RADIANT HEAT FLUX q kW/m2 0.00
BUSHFIRE ATTACK LEVEL (AS 3959-2018) BAL - BAL-LOW
DISCLAIMER: Fire-line intensity and radiant heat calculations where effective slope exceeds 20 degrees (downslope) or 15 degrees
(upslope) may be unreliable. In these locations, specialist assessment is warranted.
Old Dairy building
This structure is located in the southern portion of the property below the existing
cabinet timber plantation
The building is located just off the existing driveway to the main dwelling house located
on a ridge above the Old Dairy building and the cabinet timber plantation.
The building is separated from the cabinet timber plantation by maintained grassland
some 32 metres on a slope of approximately
“Mango Tree” Cottage:
The proposed “cottage” is located to the north of a horse paddock (see Photographic
Plate 4). The horse paddock will be maintained as a horse paddock (see Photographic
Plate 5).
The site of the Cottage is on the left bank of a minor drainage gully on land which has
had some planting of forestry trees (Gympie messmate) (see Photographic Plate 6).
The drainage gully is dominated by rainforest regrowth with the occasional Eucalyptus
cloeziana and E. microcorys
Lantana camara dominates the understorey
A Mangifera indica (Mango tree) is located just above the proposed cottage site.
Conclusion
Based on our assessment of the bushfire hazards and risk to the proposed development within
328 Upper Pinbarren Creek Road, Pinbarren we have concluded: -
1. Based on the data in the QFERS Redi-portal and the outputs from the SPP Bushfire Asset
Protection Zone Calculator indicates the vegetation is not a bushfire prone area and
as such, neither the Old Dairy nor the Mango tree cottage is within 100 metres of an
area of hazardous vegetation and as such, they do not need to respond to the Bushfire
Risk overlay code.
2. The mapping of high-value regrowth over the property is not sustained by the
observations we made while on the land. However, we acknowledge the vegetation
is currently in transition from a grassland to a complex of notophyll to microphyll vine
forest with some areas containing eucalypt species.
3. The site is on a southerly aspect slope surrounded by grazed pasture and grassland
4. Any fire burning from the north will predominately be a grass fire and run up the ridge
toward Turnbull Road road reserve before slowing down and depending on the soil
moisture either self-extinguish or become a slow-moving ground fire burning downslope
and regenerating rainforest and would, therefore, be unable to sustain any intensity
5. Any fire burning from the east will also be a grass fire, burning upslope up to the eastern
boundary, before encountering the internal firebreak/track and then burning at a
much lower rate of spread downslope toward the gullies. As the area around the
Page 22
[14]
Mango Tree Cottage will be maintained (see recommendations below), a slow-
moving ground fire will have no opportunity to involve that structure.
6. Additionally, this fire is likely to self-extinguish once it meets the moist gully immediately
below the Mango Tree Cottage.
7. Similarly, a grass fire burning toward the land from the west will also move rapidly up
the spur before encountering the top of the spur before reducing in its rate of spread
and therefore intensity. It will encounter the internal tracks, and this will be sufficient to
stop any slow-moving ground fire.
8. With respect to a fire burning toward the land from the south, we note the land slopes
up toward the south and is currently also grazed properties. This fire, therefore, would
be a relatively slow-moving grass fire which would meet Pinbarren Creek and due to
its rate of spread and intensity is highly likely to self-extinguish before it crosses the creek
and Upper Pinbarren Creek Road.
9. With regard to ember attack, embers will potentially be generated by the grass fire,
however, these embers will be such that their potential to ignite the regenerating
rainforest and cabinet wood plantation is very low. Therefore, we believe a ember
attack on the property should be seen as a low-risk event.
Bushfire Management Plan
While in a planning context the site and surrounding area presents a low bushfire hazard and
as such the proposed MCU application does not require a response to the Bushfire Overlay
Code.
However, as the property is within a rural landscape and vegetation fires, albeit grass fires, will
occur from time to time, the implementation of a property based Fire Management Plan is
essential to ensure a number of actions and strategies are established to protect life, property
and the land ecological values should a fire threaten the land.
We note the current landholder has a plan which they have been using which identifies the
location of dams and other water storage tanks as well as internal tracks. This will be useful as
a bushfire management and mitigation location plan. See Figure 7
Track and firebreaks
i. All internal vehicle tracks and firebreaks are to be assessed in August of each year to
ensure they are trafficable by Rural fire appliances.
ii. Any grass growth over any track or firebreak is to be removed as are any fallen
branches or fine fuels. Fine fuels are vegetative material less than 6 mm in diameter.
iii. All gates, where security is not an issue, are to be left un-locked during the months of
September to May.
iv. Access onto the unformed Turnbull Road is to be formalised by gate access in the
north-western corner of the property.
Water availability
i. All water tanks are to be filled at the commencement of a fire season and sufficient
storage i.e. 15,000 litres is to be quarantined for fire fighting at the commencement of
August through the May of each year.
ii. The water pump on the bottom dams is to be tested to ensure it is operational and
able to deliver suitable volumes of water for replenishing rural fire fighting appliances.
iii. Individual water storages throughout the property are to be monitored during the fire
season to understand the water availability of other water within the property during
the fire season.
iv. If not already fitted, the output hose from the pump in the bottom dams is to have a
50mm Camlock valve fitted to allow for ease of access to Rural fire appliances if and
when required.
v. Likewise, a water storage tank on the western boundary is also to be fitted with a 50mm
Camlock valve for emergency service usage.
Page 23
[15]
Signage
i. All tracks and gates are to be numbered with High visibility signage so as to inform any
rural fire fighting team a reference should they be required to access the land to assist
in grass fire management operations. It is likely that non-local rural fire brigades would
be involved in a broad fire suppression operation and as such, they would not be
familiar with the property or the local area.
Building and structure protection
i. All buildings are to have a minimum 20-metre asset protection zone around each
building.
ii. All fences, perimeter and internal, are to have a 5metre either side of the fence cleared
of groundcover and shrubs to assist in the protection of those structures and to permit
regular maintenance of those fences.
ACCESS VIA UPPER
PINBARREN CREEEK
ROAD
1
3
2
Grazed Pasture
BUSHFIRE MANAGEMENT
Grazed Pasture
Pump
Water Tank
Track/unformed road
50 ml valve fitted tanks
Asset Protection Zone
Figure 6 Bushfire Management & Mitigation Plan
Page 24
[16] If you need any additional advice with regard to this advice, please do not hesitate to contact us at your convenience. Kind regards, Rob Friend Director Rob Friend & Associates
Page 25
[17] Photographic Plates Photographic Plate 1: Forestry plantings showing upward slope and limited to no understorey. Note the lack of understorey. Photographic Plate 2: Proposed site of “Mango Tree Cottage”. The earthen track goes to the top of the ridge and has a connection to Turnbull Road road reserve. To the right of the photograph is a horse paddock.
Page 26
[18] Photographic Plate 3: The pasture neighbouring “Mango Tree Cottage” used for horses. Photographic Plate 4: The drainage gully adjacent to the proposed Mango Tree Cottage is dominated by rainforest regrowth.
Page 27
NOOSA COUNCIL
REFERENCE DOCUMENT
MCU20/0084.01 26 MAY 2025
Rob Friend & Associates Pty Ltd
Environmental Land Management Consultants
Office – 4 / 3 Heaslop St
Woolloongabba
Postal - 28 Merton Road
Woolloongabba Qld. 4102
p - (07) 3891 9131
f - (07) 3393 0388
m – 0408 016 869
e – [email protected]
Your reference: -- w – www.robfriend.com
Our reference: -- RFA19-039 ABN 83 097 068 114
ACN 097 068 114
Date: - 18 July 2023
Ms V Dioszegi
328 Upper Pinbarren Creek Road
PINBARREN Qld 4568
[email protected]
Dear Viki,
Re: Minor Change Application– 328 Upper Pinbarren Road, Pinbarren
Further to our recent correspondence regarding your request for an amendment to the Bushfire Hazard
Assessment for a Minor Change Application, please find our assessment below.
Building Proposal
The proposal is for a minor change to an existing approval for a Nature Based Tourism facility (3 cabins to
4 cabins) and a single removable dwelling unit (tiny home) to be located adjacent the southern dam and
known as “Visitor Accommodation 4”.
Rob Friend and Associates Pty Ltd prepared a Bushfire Hazard Assessment dated 9 August 2020 following
an inspection of the site and the potential cabin locations.
Site description
The subject site is located at 328 Upper Pinbarren Creek Road, Pinbarren and described as Lot 3 on
RP851976, covering an area of 25.63 Hectares (see Figure 2). The subject site is zoned as Rural under
the Noosa Plan (2016).
Several existing structures including the landowner’s principal dwelling, shed and other structures are
located within the land. In addition, there are several dams within the property and the entire site is
vegetated.
The property is accessed via a track/driveway from Upper Pinbarren Creek Road. A number of earthen
vehicle tracks traverse the lower elevations of the site which also link to less formal tracks which provide
access to the upper portions of the land and Turnbull Road upon the ridge in the northern portion of the
land. We note that while there is a track generally located along Turnbull Road, it is gated at the property
Minor Change Application | 328 Upper Pinbarren Rd | RFA19-039 18 July 2023
Rob Friend & Associates Pty Ltd
Document Set ID: 23436132
22574694
Version: 2,
1, Version Date: 28/04/2025
07/09/2023
Page 28
2
boundary and unformed for its length abutting the land. All existing farm dams within the property are
accessible from the internal track network which, at the time of our site inspection, were trafficable by rural
fire fighting appliances.
Figure 1 Nearmap aerial imagery of the site at 328 Upper Pinbarren Road dated 28 May 2023. The yellow marker
indicates the location of the proposed Accommodation 4.
Discussion
The proposed minor change involves locating a single unit dwelling within the southern corner on the east
side of the large dam.
The original Bushfire Hazard Assessment states:
“at the time of our site inspection, the regrowth could be considered to be predominantly a notophyll vine
forest in terms of its bushfire hazard profile.”
The vegetation remains in the same condition as the assessment in 2019 and is considered to be
transitioning from a timber plantation to a microphyll and notophyll vine forest with Araucaria cunninghamii
(Hoop pine) and some eucalypt species as emergent species.
Lands to the south in Lot 5 RP851976 contain dwelling houses, ancillary sheds and vehicle access tracks
with some amenity vegetation. The remaining land is partially vegetated with a grazed pasture understory.
The proposed cabin is located adjacent the residential section and not considered a bushfire prone area.
There are no bushfire hazards within 100 metres of the proposed location and the site is subject to a low
bushfire hazard.
Attachment 1 contains the layout plan for the whole of site and indicates the location of Visitor
Accommodation Unit 4 to the south of the approved Caretakers (Application no. MCU19/0053).
Minor Change Application | 328 Upper Pinbarren Rd | RFA19-039 18 July 2023
Rob Friend & Associates Pty Ltd
Document Set ID: 23436132
22574694
Version: 2,
1, Version Date: 28/04/2025
07/09/2023
Page 29
3
Conclusion
The proposed minor change for a removable dwelling structure is subject to a low bushfire hazard.
This development is not deemed necessary to comply with AS3959-2018 Construction of building in
bushfire prone areas.
Should you wish to discuss this advice further please feel free to contact me on one of the above numbers
at your convenience.
Yours faithfully,
Lucy Ford
Senior Environmental Scientist
Rob Friend & Associates Pty Ltd
Minor Change Application | 328 Upper Pinbarren Rd | RFA19-039 18 July 2023
Rob Friend & Associates Pty Ltd
Document Set ID: 23436132
22574694
Version: 2,
1, Version Date: 28/04/2025
07/09/2023
Page 30
4
Attachment 1 – Layout Plan
Minor Change Application | 328 Upper Pinbarren Rd | RFA19-039 18 July 2023
Rob Friend & Associates Pty Ltd
Document Set ID: 23436132
22574694
Version: 2,
1, Version Date: 28/04/2025
07/09/2023
Page 31
REFERENCE DOCUMENT
MCU20/0084
NOOSA COUNCIL
ABN: 26 602 913 673 15 OCTOBER 2020
-
E: [email protected]
P: (07) 5568 0180
A: 1/9 Greg Chappell Drive,
Burleigh Heads, QLD, 4220
protestengineering.com
328 Upper Pinbarren Creek Road, Pinbarren Project PTP/03729
RPD: Lot 3 on RP851976 Number: PTP/0372 – 0001 – Rev1
Area: 256,500m2 Project Name: Flood Management Plan
Regulatory Authority: Noosa Shire Council
FLOOD MANAGEMENT PLAN FOR 328 UPPER PINBARREN ROAD, PINBARREN
This letter report presents a brief flood management plan for the site at 328 Upper Pinbarren Creek Road,
Pinbarren. This report has been commissioned in response to planning consultation with Noosa Shire Council
for the proposals to construct new guest accommodation in the form of new cabin on the site. It is understood
that Noosa Shire Council has requested that a Flood Management Plan is produced to assist in safe use of the
site when guests are on the site.
The recommendation and Site Based Flood Risk Management Plan have been informed by 2no site visits by a
Civil Engineer RPEQ on the 16.08.2019 and 17.09.2019.
Figure 1 – Contextual Site Location (site accommodation indicated by red stars)
SITE SETTING
The site is located on a hillside that in part forms a natural valley. The area is well vegetated, with the site
containing a number of existing ponds and water features which flow into the main creek at the bottom of the
site.
Ffigure 2 below, shows a site profile traced along the access road to the location of the proposed new cabin.
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/02903 8 April 2019
Page 32
Page 2 of 5
B
V
A
V
B
A
Figure 2 - Elevation Profile through site (based on 1m LIDAR data). ‘A’ marks site access from Upper
Pinbarren Road; ‘B’ marks proposed lodge; Star marks bridge over creek; Circle marks level crossing.
There are two creek crossings on the site, the primary crossing located at the site entrance is via a bridge and a
second level crossing north of the caretakers house where a spillway overtops from the pond.
(It should be noted that both bridge and level crossing works are proposed to improve the flood resilience and
better notify site users of the risks at these locations.)
SITE FLOOD RISK
The primary source of flood risk to the site and in particular site users relates to flash flooding within the site
and wider catchment from heavy rainfall events. Specifically, there are number of ponds on the site which pick
up runoff from rainfall within the site and overflow down the site and into the main creek that forms the south
western border of the site. Although these ponds and other features are significantly lower than any of the
existing or proposed buildings on the site and would not pose direct risk to those buildings, access routes to and
from the site could be subject to inundation and flooding in more severe events. The purpose of this Flood
Management Plan presented in Appendix 1 is to provide a quick reference guide for the site owners and users
of the site in an emergency situation.
We trust this information is satisfactory for your current needs. Should you have any questions, please feel free
to contact the undersigned
Protest Engineering
Ryan Hofman
Senior Civil Engineer
BEng (Hons) CPEng CWEM RPEQ 21643
PTP/03104 – Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 33
Page 3 of 5 APPENDIX 1 – FLOOD MANAGEMENT PLAN PTP/03104 – Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 34
Page 4 of 5 FLOOD MANAGEMENT PLAN The following should be provided to all site managers. Site managers should be appropriately trained and made clearly aware of the flood risks pertaining to the site, safe areas of evacuation and preventative measures. Some general measures are included below (this is not an exhaustive list but provides a number of key items that should be implemented and followed by guests and staff). It should be noted that the site is not within a specified Flood Alert/Warning Area, however it is advised that the site users sign up to the Noosa Flood Alert System which would give the closest approximate of flood risk to the site. DEFINITIONS: Flood Alert – These are provided through local media and Bureau of Meteorology. The site manager shall review these sources daily to monitor predicted weather patterns and where necessary advise guests that heavy rainfall is expected. Flood Warning – These are official alerts to warn against the real risk of flooding and immediate action should occur to manage risks to people and property. KEY INFORMATION SOURCES: Below are key information sources. These should be made available to all site managers and guests and reviewed daily by site managers. Internet/World Wide Web Flood Warnings, River Height Bulletins and other weather related data is available on the Bureau's Web page at http://www.bom.gov.au . The Queensland Flood Warning Centre website is http://www.bom.gov.au/qld/flood . Telephone Weather Flood Warnings are available through a recorded voice retrieval system, along with a wide range of other weather related and climate information. Main Directory Phone 1900 955 360 Flood Warnings Phone 1300 659 219 EVACUATION AREAS It is considered that the existing buildings on site area suitable as places of safe refuge, as these are elevated well above existing water features and water courses and are not deemed to be at immediate risk of inundation. Should evacuation from any building be required, a risk assessment of the conditions should be undertaken, namely an assessment of the evacuation route. Evacuation should only occur if flood depths are less than 25cm (or as advised by emergency services). PTP/03104 – Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 35
Page 5 of 5
FLOOD EMERGENCY PROCEDURE
On receipt of a FLOOD ALERT, the individual property owners and occupiers should:
Monitor the situation via local media;
Make themselves aware of forecast local weather conditions;
Alert both current visitors, and those scheduled to arrive, of the situation;
Prepare to evacuate if necessary.
On receipt of a FLOOD WARNING, the individual property owners and occupiers should:
Follow advice to “go in, stay in, and tune in”;
Move all vehicles to an area outside of the potential flood extent, if safe to do so;
Alert scheduled visitors that they should seek alternative accommodation;
Be prepared to follow instruction from the Emergency Services.
On receipt of a SEVERE FLOOD WARNING, the individual property owners and occupiers should:
Follow advice to “go in, stay in, and tune in”;
Remain attentive to local media forecasts and news bulletins;
Do not evacuate unless instructed to do so by the Emergency Services;
1.1 Upon receipt of a Flood Warning, site users are advised to remain on site in a designated place of safe
refuge. Evacuation from the site should only be undertaken if flood levels to the site access bridge are
below the bridge deck, and spillway levels are less than 250mm deep; or as directed by emergency services.
1.2 If evacuation from site is required or advised, it is suggested to utilise the alternative site access through
the neighbour’s property.
Figure 3 - Site Location Plan showing emergency access route (highlighted green) in Flood Emergency
PTP/03104 – Lot 195, 1164 Cooroy Belli Ck Road, Ridgewood 28 June 2019
Page 36
NOOSA COUNCIL
REFERENCE DOCUMENT
MCU20/0084.01 26 MAY 2025 Protest Engineering
ABN: 26 602 913 673
www.protestengineering.com
Viktoria Dioszegi Project Number: PTP/12376
328 Upper Pinbarren Creek Road, Letter Number: PTP12376 – 0002 – Rev0
Pinbarren QLD Project Name: 328 Upper Pinbarren Creek Road
Email: [email protected]
Flood Management Plan
Proposed Guest Accommodation
328 Upper Pinbarren Creek Road
FLOOD MANAGEMENT PLAN FOR 328 UPPER PINBARREN ROAD, PINBARREN
This letter report presents an update to a flood management plan for the site at 328 Upper
Pinbarren Creek Road, Pinbarren prepared 8th April 2019 by our office. This report has been
commissioned in response to planning consultation with Noosa Shire Council for the proposal to
construct new guest accommodation in the form of a new cabin on the site. It is understood that
Noosa Shire Council has requested that a Flood Management Plan is produced to assist in safe use of
the site when guests are on the site.
The recommendation and Site Based Flood Risk Management Plan have been informed by 2no site
visits by a Civil Engineer RPEQ.
Figure 1 – Contextual Site Location (site accommodation indicated by red stars)
328 Upper Pinbarren Creek Road 16 September 2023
Document Set ID: 23436134
22593170
Version: 2,
1, Version Date: 28/04/2025
22/09/2023
Page 37
Page 2 of 6
SITE SETTING
The site is located on a hillside that in part forms a natural valley. The area is well vegetated, with
the site containing several existing ponds and water features which flow into the main creek at the
bottom of the site.
Figure 2 below, shows a site profile traced along the access road to the location of the proposed new
cabin.
B
A
B
A
Figure 2 - Elevation Profile through site (based on 1m LIDAR data). ‘A’ marks site access from Upper Pinbarren
Road; ‘B’ marks proposed lodge; Star marks bridge over creek; Circle marks level crossing.
There are two creek crossings on the site, the primary crossing located at the site entrance is via a
bridge and a second level crossing north of the caretakers’ house where a spillway overtops from the
pond.
(It should be noted that both bridge and level crossing works are proposed to improve the flood
resilience and better notify site users of the risks at these locations.)
328 Upper Pinbarren Creek Road 16 September 2023
Document Set ID: 23436134
22593170
Version: 2,
1, Version Date: 28/04/2025
22/09/2023
Page 38
Page 3 of 6
SITE FLOOD RISK
The primary source of flood risk to the site and in particular site users relate to flash flooding within
the site and wider catchment from heavy rainfall events. Specifically, there are number of ponds on
the site which pick up runoff from rainfall within the site and overflow down the site and into the
main creek that forms the southwestern border of the site. Although these ponds and other features
are significantly lower than any of the existing or proposed buildings on the site and would not pose
direct risk to those buildings, access routes to and from the site could be subject to inundation and
flooding in more severe events. The purpose of this Flood Management Plan presented in Appendix
1 is to provide a quick reference guide for the site owners and users of the site in an emergency.
We trust this information is satisfactory for your current needs. Should you have any questions,
please feel free to contact the undersigned.
Written By: Reviewed By:
Craig Smerdon Nick Ward
Senior Civil Engineer Chief Operating Officer
328 Upper Pinbarren Creek Road 16 September 2023
Document Set ID: 23436134
22593170
Version: 2,
1, Version Date: 28/04/2025
22/09/2023
Page 39
Page 4 of 6
APPENDIX 1 – FLOOD MANAGEMENT PLAN
328 Upper Pinbarren Creek Road 16 September 2023
Document Set ID: 23436134
22593170
Version: 2,
1, Version Date: 28/04/2025
22/09/2023
Page 40
Page 5 of 6
FLOOD MANAGEMENT PLAN
The following should be provided to all site managers. Site managers should be appropriately trained
and made clearly aware of the flood risks pertaining to the site, safe areas of evacuation and
preventative measures. Some general measures are included below (this is not an exhaustive list but
provides a number of key items that should be implemented and followed by guests and staff).
It should be noted that the site is not within a specified Flood Alert/Warning Area, however it is
advised that the site users sign up to the Noosa Flood Alert System which would give the closest
approximate of flood risk to the site.
DEFINITIONS:
Flood Alert – These are provided through local media and Bureau of Meteorology. The site manager
shall review these sources daily to monitor predicted weather patterns and where necessary advise
guests that heavy rainfall is expected.
Flood Warning – These are official alerts to warn against the real risk of flooding and immediate
action should occur to manage risks to people and property.
KEY INFORMATION SOURCES:
Below are key information sources. These should be made available to all site managers and guests
and reviewed daily by site managers.
Internet/World Wide Web
Flood Warnings, River Height Bulletins and other weather related data is available on the Bureau's
Web page at http://www.bom.gov.au .
The Queensland Flood Warning Centre website is http://www.bom.gov.au/qld/flood .
Telephone Weather
Flood Warnings are available through a recorded voice retrieval system, along with a wide range of
other weather related and climate information.
Main Directory Phone 1900 955 360
Flood Warnings Phone 1300 659 219
EVACUATION AREAS
It is considered that the existing buildings on site area suitable as places of safe refuge, as these are
elevated well above existing water features and water courses and are not deemed to be at
immediate risk of inundation. Should evacuation from any building be required, a risk assessment of
the conditions should be undertaken, namely an assessment of the evacuation route. Evacuation
should only occur if flood depths are less than 25cm (or as advised by emergency services).
328 Upper Pinbarren Creek Road 16 September 2023
Document Set ID: 23436134
22593170
Version: 2,
1, Version Date: 28/04/2025
22/09/2023
Page 41
Page 6 of 6
FLOOD EMERGENCY PROCEDURE
On receipt of a FLOOD ALERT, the individual property owners and occupiers should:
Monitor the situation via local media;
Make themselves aware of forecast local weather conditions;
Alert both current visitors, and those scheduled to arrive, of the situation;
Prepare to evacuate if necessary.
On receipt of a FLOOD WARNING, the individual property owners and occupiers should:
Follow advice to “go in, stay in, and tune in”;
Move all vehicles to an area outside of the potential flood extent, if safe to do so;
Alert scheduled visitors that they should seek alternative accommodation;
Be prepared to follow instruction from the Emergency Services.
On receipt of a SEVERE FLOOD WARNING, the individual property owners and occupiers should:
Follow advice to “go in, stay in, and tune in”;
Remain attentive to local media forecasts and news bulletins;
Do not evacuate unless instructed to do so by the Emergency Services;
Upon receipt of a Flood Warning, site users are advised to remain on site in a designated place of
safe refuge. Evacuation from the site should only be undertaken if flood levels to the site access
bridge are below the bridge deck, and spillway levels are less than 250mm deep; or as directed by
emergency services.
If evacuation from site is required or advised, it is suggested to utilise the alternative site access
through the neighbour’s property.
Figure 3 - Site Location Plan showing emergency access route (highlighted green) in Flood Emergency
328 Upper Pinbarren Creek Road 16 September 2023
Document Set ID: 23436134
22593170
Version: 2,
1, Version Date: 28/04/2025
22/09/2023
Page 42
REFERENCE DOCUMENT
MCU20/0084 ABN: 26 602 913 673
NOOSA COUNCIL
15 OCTOBER 2020 E: [email protected]
-
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Viktoria Dioszegi Project Number: PTP/03499
328 Upper Pinbarren Road, Letter Number: PTP/03499 – 0001
Upper Pinbarren, QLD, 4568 Project Name: 328 Upper Pinbarren Road,
Upper Pinbarren, QLD,
4568
Email: [email protected]
Slope Stability Risk Assessment Report
328 Upper Pinbarren Road, Upper Pinbarren – Proposed “Mango Tree” Cabin
RPD: Lot 3 on RP851976
Area: 256,500 m2
Regulatory Authority: Noosa Shire Council
HAZARD CLASSIFICATION ‘Low’
Figure 1 – Site for proposed building footprint - facing west
AIM
1. To establish the hazard classification for the above block with regards to slope instability;
2. To establish that a development will not adversely affect the stability of the above site; and
3. To recommend any measures that would improve stability.
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 August 2019
Page 43
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
INTRODUCTION
Protest Engineering (Protest) were commissioned by Viktoria Dioszegi to undertake a Geotechnical
Stability Assessment for the proposed “Mango Tree” cabin located at 328 Upper Pinbarren Road,
Upper Pinbarren. The location of the site is shown in Figure 2 – Site Location below.
The investigation and assessment comprised of determining the hazard risk of the natural slope due
to proposed construction. The slope assessed is shown in Figure 3 – Assessed Slope with two sections
of the slope derived from lidar data shown in Figure 4 and 5 – Slope Section.
Figure 2 – Site Location
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 44
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Figure 3 – Assessed Slope (facing south west down slope)
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 45
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Figure 4 – Slope section east-west orientation (maximum angle 14.1)﮿
Figure 5 – Slope section south-north orientation (Maximum angle 4.26)﮿
SOIL PROPERTIES
Two boreholes undertaken by Protest have been used as a basis for the natural soil profile. Beneath
the topsoil/grass layer, residual, firm to very stiff clayey silts were encountered to borehole
termination at 2.0 m depth. Detailed borehole logs are attached. The clayey silts encountered were
classified as moist at the time of investigation. No Groundwater seepage was encountered at the time
of investigation.
RETAINING WALLS
All retaining walls should be designed as per AS4678. Any retaining walls are required to have a factor
of safety of 1.5 minimum. This office does not take responsibility for the integrity of any existing
retaining walls including rock walls, or future retaining walls unless specifically designed by this office.
RECOMMENDATIONS
a. From our findings, the hazard risk of the natural slope is considered to be ‘Low’, which is
should be acceptable.
b. Attached are drainage and earthworks recommendations as per the Australian Geotechnical
Society examples of good hillside construction practices. See AS2870 for further
recommendations.
c. Stormwater is to follow a stormwater management plan.
d. Effluent disposal may be by use of trenches.
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 46
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Table 1 – Assessment Data
Criteria COMMENT
History: Based on the Noosa Shire Council website this area is
tagged with susceptibility to landslide.
Current Stability: No signs of instability in the slope.
Stability of Adjoining Properties: Residential block with proposed new dwelling
construction. Will have no stability effects on
surrounding properties.
Requirement for Retaining Structures: Dependant on excavations and design. If required,
retaining walls are to be designed by appropriate
engineers. If retaining walls are greater than 2.5 m, this
office should be advised.
Special Design Features Required: Nil.
Special Surface or Sub-Surface Drainage Nil.
Measures:
Evidence of Previous Instability: Nil.
Assessment of Surface Drainage: Good – Flow generally heading towards the southwest.
Attached is an example of prudent site drainage
measures.
Assessment of Sub-Surface Drainage: N/A
Building Site Stability: With respect to the assessed hazard risk, Protest
Engineering zone this site as ‘low’.
Long Term Stability of Building Site and Building: Provided the (soil) information is correct, good practice
for surface drainage is followed, the engineer designs
were carefully followed, the site and dwelling stability
should be considered as ‘low’ hazard.
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 47
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Table 2 – Site Information
COMMISION As requested, a geotechnical engineer from Protest
Engineering visited the site on the 2nd of August 2019.
The weather was fine.
SITE Residential block (256 500m2). Existing residential
dwelling at the west of the site. Proposed new
residential dwellings towards the centre of the site.
GEOLOGY Referencing the Queensland Geology Map the geology of
the site is; Middle Triassic aged Kin Kin Beds comprising
Strongly cleaved and commonly kinked mudstone with
thin siltstone laminae; minor volcanilithic sandstone.
CONCENTRATION OF WATER RUN-OFF Upper slope runoff generally to the southwest of the
block.
EFFLUENT DISPOSAL On-site Disposal by trenches
GROUND WATER Nil.
INFLUENCING HAZARD FEATURES OUTSIDE THE Nil.
BLOCK
EXISTING EARTHWORKS Nil.
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 48
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Table 3 – Landslide Susceptibility Analysis, using Macgregor & Taylor Method 2001 AG-Journal.
Criteria Description Level Factor
Natural Surface Slope Between 5 and 15 Low 0.5
degrees
Slope Shape Planar Moderate 0.9
Site Geology Sedimentary Moderate 1
Soils Residual soil >3m deep High 1.5
Evidence of Groundwater Minor moistness Moderate 0.9
Concentration of Surface Water Upper slope Moderate 0.9
Evidence of Instability No sign of instability Low 0.5
Relative Susceptibility
0.27
Relative Susceptibility 0.27
Hazard Rating Low
Hazard Risk Acceptance Low
Protest Engineering Reviewed By:
Sean Kelly James Tayler RPEQ#1407
Geotechnical Engineer Checking Engineer for Protest Engineering
Attachments: 1: Hillside Construction
2: Effluent and Surface Water Disposal
Attachment 1 – Hillside Construction (As per AGS):
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 49
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 50
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 5/10-12 Claude Boyd Parade,
Bells Creek, QLD, 4551
protestengineering.com
Attachment 2 – Effluent and Surface Water Disposal (As per ASG):
PTP/03499 – 328 Upper Pinbarren Road, Upper Pinbarren (Mango Tree Cabin) 13 July 2019
Page 51
DCP1
BH3
BH4
Notes:
1. Test locations are approximate and are
shown with reference to site features.
Borehole Location and Number
CLIENT TITLE Job No.
Viktoria Dioszegi Test Location Plan: PTP_034996
1 Issue for Report 09/08/19 KM SK 328 Upper Pinbarren Creek Road, Pinbarren Drawing No.
Issue Description Date DRN CHK APP 1
Page 52
BORE 3
CLIENT Viktoria Dioszegi DATE 02/08/2019
PROJECT Slope Stabilities and Site Classification EASTING
LOCATION 328 Upper Pinbarren Creek Road, Pinbarren NORTHING
PROJECT NUMBER PTP/03499 SURFACE ELEV.
DRILLER Protest RIG 4wd mounted drill rig LOGGER KM
Sampling & Testing
Drilling Method
Graphic Log
Strength Dynamic
Casing
Material Description (Consistency, Results & Penetrometer Test
Type (blows per 100 mm)
Comments
Water
Relative Density,
RL Depth Rock Strength)
(m) (m) 5 10 15 20
TOPSOIL
Medium Dense 3
CH clayey SILT trace sand and gravel, stiff, orange, high plasticity, fine
to medium angular gravel, fine to coarse sand, moist 3
3
3
red-brown
3
No groundwater seepage encountered at the time of investigation.
0.5
4
0.6
4
D 4
3
0.9
4
1.0
Stiff 5
4
4
4
3
1.5
4
5
5
8
6
2.0
Bore terminated at 2 m.
Target depth achieved.
PROTEST-BORE LOGS.GPJ GINTDATATEMP_PROTEST.GDT 9/8/19
2.5
3.0
Remarks:
Auger to 2.0 m;
Page 53
BORE 4
CLIENT Viktoria Dioszegi DATE 02/08/2019
PROJECT Slope Stabilities and Site Classification EASTING
LOCATION 328 Upper Pinbarren Creek Road, Pinbarren NORTHING
PROJECT NUMBER PTP/03499 SURFACE ELEV.
DRILLER Protest RIG 4wd mounted drill rig LOGGER KM
Sampling & Testing
Drilling Method
Graphic Log
Strength Dynamic
Casing
Material Description (Consistency, Results & Penetrometer Test
Type (blows per 100 mm)
Comments
Water
Relative Density,
RL Depth Rock Strength)
(m) (m) 5 10 15 20
TOPSOIL
Medium Dense 5
CH clayey SILT trace sand and gravel,stiff, orange, medium plasticity,
fine angular gravel, fine to coarse sand, moist. 3
2
3
3
No groundwater seepage encountered at the time of investigation.
0.5
stiff, red-brown.
4
5
5
6
4
1.0
Stiff 4
4
5
3
3
1.5
3
4
5
6
6
2.0
Bore terminated at 2 m.
Target depth achieved.
PROTEST-BORE LOGS.GPJ GINTDATATEMP_PROTEST.GDT 9/8/19
2.5
3.0
Remarks:
Auger to 2.0 m;
Page 54
-
REFERENCE DOCUMENT © COPYRIGHT ALL RIGHTS RESERVED
MCU20/0084
NOOSA COUNCIL
15 OCTOBER 2020
-
EXISTING SPILLWAY (SHOWN
EXISTING POND (SHOWN INDICATIVELY) INDICATIVELY)
150mm THICK N32 REINFORCED CONCRETE
PROVIDE 1 LAYER OF SL82 MESH WITH 50mm
COVER.
1m WIDE 300mm THICK D50 150mm APPROXIMATELY 2.5-3m WIDE SPILLWAY
ROCK ARMOURING TO PREVENT SCOUR. CROSSING
LAY OVER GEOTEXTILE PROVIDE MEMBRANE 1m WIDE 300mm THICK D50 150mm
BENEATH SPILLWAY SLAB ROCK ARMOURING TO PREVENT SCOUR.
LAY OVER GEOTEXTILE
MIN 300mm THICK LAYER OF GEOTEXTILE
COMPACTED TYPE 2.5 ROAD BASE LAID
OVER GEOTEXTILE
TYPICAL SPILLWAY CROSSING DETAIL (SECTION)
(NTS)
150mm THICK N32 REINFORCED CONCRETE
PROVIDE 1 LAYER OF SL82 MESH WITH 50mm
COVER.
EXISTING ACCESS ROAD APPROXIMATELY 5m LONG SPILLWAY
ACCESS ROAD TO BE MIN 100MM CROSSING WITH 3.3% NOMINAL FALLS TO APPROXIMATELY 2.5-3m WIDE SPILLWAY
COMPACTED GRAVEL CENTRELINE OF SLAB. CROSSING
PROVIDE MEMBRANE
BENEATH SPILLWAY SLAB
(i) This drawing is not to be scaled, work to figured dimensions only,
confirmed on site.
(ii) This drawing is to be read in conjunction with all relevant architectural MIN 300mm THICK LAYER OF
COMPACTED TYPE 2.5 ROAD BASE LAID
drawings, detailed specifications where applicable and all associated OVER GEOTEXTILE
drawings in this series.
(iii) Any discrepancy on this drawing is to be reported immediately to the
partnership for clarification. TYPICAL SPILLWAY CROSSING DETAIL (PROFILE)
(iv) The contractor is responsible for all temporary works and for the stability
of the works in progress. (NTS)
(v) This is a CAD drawing, under no circumstances manual alterations may be
made.
(vi) Copyright reserved - copying or reproduction of this drawing or
electronic data without written permission of Protest Engineering is not
permitted.
(vii) Disclaimer - The hard copy accompanying the electronic data is the legal
transmission of information. The electronic data are issued only for
convenience of use. No responsibility for the accuracy or for any
consequence resulting from the use of alteration of this information is
accepted.
CLIENT: DRAWING NUMBER:
VIKI APPROVED:
PTP/03729/EX01
PROJECT: STATUS:
MANGO CABIN ACCESS ROAD PRELIMINARY
DRAWING TITLE: RYAN HOFMAN FOR INFORMATION ONLY
Synergy // Efficiency // Productivity SPILLWAY CROSSING DETAIL NOT FOR CONSTRUCTION
| STRUCTURAL
p | (07) 5568 0180 DRAWING SCALE AT A1:
| GEOTECHNICAL SITE ADDRESS:
DESIGNED: RH JOB: PTP/03729 ORTN:
e | [email protected]
w | www.protestengineering.com
| ENVIRONMENTAL
328 UPPER PINBARREN CREEK ROAD, PINBARREN NTS
| TESTING SERVICES CHECKED: RH SHEET No. 01 OF 01
Page 55
ABN: 26 602 913 673
E: [email protected]
P: (07) 5568 0180
A: 1/9 Greg Chappell Drive,
Burleigh Heads, QLD, 4220
protestengineering.com
Viktoria Dioszegi Project Number: PTP/12376
328 Upper Pinbarren Creek Road, Letter Number: PTP/12376 – 0001 – Rev0
Pinbarren, QLD 4568 Project Name: Tiny House – 328 Upper Pinbarren
Creek Rd – Landslide Risk
Assessment
Email: [email protected]
Landslide Susceptibility Assessment
Short-Term Accommodation
328 Upper Pinbarren Creek Road, Pinbarren, QLD
Introduction
This report presents the results of the landslide risk assessment carried out by Protest Engineering (Protest) for
the existing short-term accommodation at 328 Upper Pinbarren Creek Road, Pinbarren. This assessment was
commissioned by Viktoria Dioszegi (The Client).
It is understood that the existing short-term accommodation’s BLE (Building Location Envelope) requires a
Landside Susceptibility Assessment under Noosa Shire Council legislation. This report presents the findings of
the desktop study, fieldwork, and landslide frequency analysis.
Scope and Method of Assessment
The aim of this report is to assess the potential risk of slope instability or landslide risk for the existing short-
term accommodation BLE situated near the southern extent of the property.
The methodology adopted by Protest to assess the landslide risk for this site was based on the following:
• Guidelines developed by the Australian Geomechanics Society (AGS), Landslide Risk Management,
volume 42 No.1, March 2007.
• Landslide Frequency Assessment in accordance with the report ‘’A Method of Zoning Landslide Hazards”,
prepared by MacGregor and Taylor 2001.
• A review of existing Hazard mapping, aerial photos, and various published information to assist in
identifying past activity.
• A review of previously conducted Landslide Risk Assessment (PTP/03499 - 0001), performed by Protest
on 13 July 2019.
• One (1) Borehole, nominated BH 1 drilled to a depth of 0.5 m using a hand-auger, and four (4) Dynamic
Cone Penetrometer (DCP) tests, nominated DCP 1 – 4. These were undertaken at Protest nominated
locations, presented in Drawing 3.
• A walkover inspection by an experienced geotechnical engineer to assess for any signs of slope instability
and to assess the ground slope/s and general site conditions.
NOOSA COUNCIL
REFERENCE DOCUMENT
MCU20/0084.01 26 MAY 2025
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/12376 328 Upper Pinbarren Creek Road, Pinbarren 11 August 2023
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 56
Page 2 of 6
Desktop Study
The following information has been reviewed for the desktop study and provided as attachments to this
report:
• Nearmap aerial Imagery (23 May 2023) – Drawing 1 and 2;
• Borehole and DCP Test Location Plan (Nearmap Aerial Imagery 23 May 2023) – Drawing 3;
• Hillside Shading Traditional (extracted from GeoResGlobe) – Drawing 4;
• Surface Slope Mapping developed from 2014 LiDAR data – Drawing 5;
• Surface Topography and Contour Mapping developed from 2014 LiDAR data – Drawing 6;
• Regional Surface Geology (extracted from GeoResGlobe) – Drawing 7; and
• Slope cross-sections developed from 2014 LiDAR data – Drawing 8.
The short-term accommodation is located in the southern portion of the property, as shown in Drawing 1 (26
May 2023 Nearmap view of the site).
The AGS landslide frequency analysis method of assessment adopted in the AGS landslide frequency analysis
uses slope angle in degrees. Drawing 5 was generated using 2014 LiDAR data to show slope mapping in degrees.
The slope angle from the LiDAR data and field observations of the ground surface slopes were subsequently used
for the landslide frequency analysis.
Review of the slope mapping in Drawing 5 indicates that the ground surface throughout the assessed area, slopes
down to the west at a slope angles of approximately 15° - 20°.
Review of regional surface geology presented on Queensland Globe indicates that the site is underlain by
Middle Triassic aged Kin Kin beds (RJI). Typically comprising ‘Strongly cleaved and commonly kinked mudstone,
with thin siltstone laminae; minor volcanilithic sandstone’. An extract of the local geological mapping is
attached in drawing 7.
Subsurface conditions
The subsurface conditions encountered during the geotechnical investigation generally comprised a superficial
layer of topsoil overlying natural, clayey silt with trace gravels to borehole termination. The DCP test results
and observations of the exposed cut batter on the eastern side of the dwelling indicate that harder residual /
extremely weathered material is present below depths of approximately 0.5m to 1.0m. The subsurface
conditions are consistent with those encountered within the previous Landslide Risk Assessment undertaken
at a different location on the investigated property.
Site Walkover Assessment Findings
A visual walkover inspection was performed on 18 July 2023. The following observations were made:
• Topographically, the short-term accommodation is situated on a levelled pad, cut into the natural
slope. The levelled pad appears to have been predominantly formed by cutting, with possibly some
minor filling on the western side(although no Level One certification was produced by the client).
Observations on site indicated that the natural slope falls at no more than approximately 20°. The
batters on the eastern and western sides of the dwelling ranged in height between approximately
1.0m and 1.5m and had surface slopes of approximately 45°.
• The vegetation within the investigated area comprised low grass, with scattered bushes and mature
trees bordering the investigated area. No indication of soil movement such as slumping, sinkholes or
misshapen tree trunks were observed in the site vegetation. General site conditions are presented in
Figures 1 and 2 below.
• No tension cracking was observed on or across any of the slopes on the site.
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/12376 328 Upper Pinbarren Creek Road, Pinbarren 11 August 2023
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 57
Page 3 of 6
• The existing residential structures on the site have no evidence of being affected by ground
movements associated with slope instability.
Figure 1: General Site Conditions
Figure 2: General Site Conditions
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/12376 328 Upper Pinbarren Creek Road, Pinbarren 11 August 2023
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 58
Page 4 of 6
Desktop Assessment Findings
A review of historical records and imagery has been undertaken. No indicators of past landslip activity or
instability on or surrounding neighbouring sites has been identified.
Landslide Susceptibility Assessment
The landslide susceptibility assessment given in this report is consistent with the procedures outlined in the
report ‘’A Method of Zoning Landslide Hazards”, prepared by MacGregor and Taylor 2001. The following major
site features have been considered in determining a likelihood estimate.
• The natural slope angle.
• Local area geology.
• Concentration of surface water.
• Evidence of previous instability.
• The natural slope shape/formation.
• Material strength.
• Evidence of groundwater.
A correlation between relative frequency and potential likelihood rating has been determined using the
following table:
Table 1: Correlation between relative frequency and potential hazard
Analysis Relative Frequency Likelihood Rating
>6.0 VH (Very High Hazard) The event is expected to occur.
2.0 – 6.0 H (High Hazard) The event will probably occur under adverse conditions
0.6 – 2.0 M (Moderate Hazard) The event could occur under adverse conditions
0.2 – 0.6 L (Low Hazard) The event might occur under adverse conditions
<0.2 VL (Very Low Hazard) The event is conceivable under exceptional circumstances
A Landslide Frequency Analysis has been completed, and the hazard for the nominated development site and
surrounds of such are outline in the table below:
Table 2: Summary of Landslide Susceptibility Assessment
Analysis Relative Frequency Likelihood Rating
Landslide Frequency Analysis 0.44 Low
A landslide susceptibility analysis for the short-term accommodation has been carried out with the result being
‘Low’. This is usually acceptable by regulators and managed by normal slope maintenance procedures.
The landslide susceptibility analysis summarised above is for global landslide type hazards. Although the result
of the assessment for this hazard type was ‘Low’, additional assessments were carried out for the two batters
on the eastern and western sides of the dwelling. Field observations indicated that these batters had surface
slopes of approximately 45°. This is considered too steep to achieve long-term stability.
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/12376 328 Upper Pinbarren Creek Road, Pinbarren 11 August 2023
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 59
Page 5 of 6
Instability issues for the two batters would likely involve slumping and erosion. Larger scale movements of soil
are less likely but still possible, particularly if any erosion is left untreated or following heavy rainfall. The
consequences of this instability for the upslope batter is assessed as minor, however, instability of the
downslope batter may affect the foundation of the dwelling and is therefore more significant. On this basis, this
instability has been assessed as a ‘Moderate’ hazard.
Requirements to achieve and maintain a ‘Low’ hazard rating for the batters are given in the next section.
Requirements that must be carried out or implemented in order to maintain the ‘Low’ rating for the global
landslide hazard rating are given in the subsequent section.
Batter Treatment Requirements
To achieve a ‘Low’ instability hazard rating for the batters, the following is required:
• Trim the batters back to no steeper than 2:1 (horizontal to vertical);
• Mulch and vegetate the batters as soon as possible to reduce the potential for surface scouring and
erosion.
The dwelling should be located no closer than 1m from the crest of the downslope batter.
As an alternative to flattening the batters, engineer designed retaining walls can be considered.
Slope Maintenance Requirements
The following comments and recommendations are required for the proposed development works to ensure
long-term stability of any proposed infrastructure and batters within the BLE.
• Ensure all stormwater drains are free of blockage to allow surficial and subsurface water flow to freely
flow into piped road drainage and/or stormwater storage tanks;
• Any proposed earthworks should be undertaken in accordance with relevant Council guidelines and
Australian Standards;
• The Australian Geomechanics Society extract ‘Australian Geoguide LR8 (Hillside Construction)’
(attached) must be strictly followed for good hillside construction practices.
• Engineering design and global stability analysis should be undertaken on all proposed retaining walls
and batters within or adjacent the BLE.
Uncontrolled surface runoff and discharges can cause an ingress of surface water into the sloping terrain and
fill material if adequate drainage is not implemented and maintained. Providing adequately designed,
constructed and maintained surface and subsurface drainage is important to the long-term performance of the
Site in terms of slope stability and erosion. This includes the following:
• A suitably lined surface drain must be constructed upslope of the building area to intercept and divert
water runoff away from the building area.
• Drainage outlets and water discharge areas must be located downslope from the building area.
• All surface runoff and collected roof water should be piped into the road drainage system or into
storage tanks. Any tank water overflow must be piped downslope of the building and road areas.
• Uncontrolled water discharges onto the existing ground and hill slope in the building area or adjacent
area must be avoided.
• All stormwater and drainage systems must be approved by Council.
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/12376 328 Upper Pinbarren Creek Road, Pinbarren 11 August 2023
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
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Any retaining walls within the BLE must be designed by a suitably qualified engineer and must include suitable
drainage behind the wall to prevent the build-up of hydrostatic pressure. Retaining walls must be designed
taking account of internal stability, such as sliding, overturning etc and external (global) stability.
The landslide frequency analysis is applicable to the assessed BLE only.
We trust that the above information is suitable for your present requirements. Should you have any queries,
please do not hesitate to contact the undersigned.
Written By: Reviewed By:
Connor Birss Simon Wynne (RPEQ 17390)
Undergraduate Geotechnical Engineer Senior Geotechnical Engineer
Attachments:
- Drawing 1 and 2: Nearmap Aerial Imagery (26 May 2023)
- Drawing 3: Borehole and DCP Test Location Plan
- Drawing 4: Hillside Shading Traditional (extracted from GeoResGlobe)
- Drawing 5: Surface Slope Mapping (developed from 2014 LiDAR data)
- Drawing 6: Surface topography and contour mapping developed from 2014 LiDAR
- Drawing 7: Regional Surface Geology (extracted from GeoResGlobe)
- Drawing 8: Slope cross-sections developed from 2014 LiDAR data
- Borehole and Dynamic Cone Penetrometer Test Logs
- Landslide risk assessment
- Practical Note Guidelines for Landslide Risk Management 2007, Examples of Good Hillside Practice
Australian GeoGuide LR9 (Effluent Disposal)
Gold Coast | Sunshine Coast | Melbourne | Emerald
PTP/12376 328 Upper Pinbarren Creek Road, Pinbarren 11 August 2023
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 61
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
boundaries
Area Assessed
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Nearmap Aerial Imagery
(23 May 2023)
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 1 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 62
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
boundaries
Area Assessed
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Nearmap Aerial Imagery
(23 May 2023)
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 2 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 63
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
DCP 2 BH1 Approximate neighbouring site
boundaries
Area Assessed
Borehole Location
DCP 1 DCP 4
Dynamic Cone Penetrometer
(DCP) Test Location
DCP 3
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Nearmap Aerial Imagery
(23 May 2023)
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 3 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 64
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
boundaries
Area Assessed
Slope cross-section
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Hillside Shading Traditional
(extracted from GeoResGlobe)
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 4 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 65
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
boundaries
Area Assessed
Slope cross-section
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Surface Slope Mapping
developed from 2014 LiDAR data
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 5 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 66
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
boundaries
Area Assessed
Slope cross-section
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Surface topography and contour
mapping developed from 2014
LiDAR data
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 6 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 67
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
boundaries
Area Assessed
Kin Kin beds (Rk)
- Strongly cleaved and commonly
kinked mudstone with thin siltstone
laminae; minor volcanilithic
sandstone
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Regional Surface Geology
(extracted from GeoResGlobe)
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 7 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 68
Site locality
328 Upper Pinbarren
Creek Road
Legend
Site location
Approximate neighbouring site
Slope cross-section
boundaries
Area Assessed
Client: Viktoria Dioszegi
Site: 328 Upper Pinbarren Creek Rd
Pinbarren, QLD, 4568
Title: Slope cross-section developed
from 2014 LiDAR data
Date: Drawn: Checked:
24/07/2023 JAS MA
Project: Drawing No: Revision
PTP/12376 8 0
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 69
BOREHOLE 1
CLIENT: Viktoria Dioszegi DATE: 18/07/2023
PROJECT: Tiny House Landslide Risk Assessment EASTING:
LOCATION: 328 Upper Pinbarren Creek Road NORTHING:
PROJECT NUMBER: PTP_12376 SURFACE ELEV:
DRILLER: Protest Engineering RIG: Hand Auger LOGGED: JC CHECKED: MA
Sampling & Testing
Drilling Method
Layer Depths
Graphic Log
Strength Dynamic
Material Description (Consistency, Results & Penetrometer Test
Type (blows per 100 mm)
Comments
Water
Relative Density,
RL Depth Rock Strength)
(m) (m) 5 10 15 20
0 TOPSOIL silty CLAY, firm, orange brown, medium plasticity, moist
Firm
0.1 ML clayey SILT trace gravel, stiff, orange, low plasticity, fine to medium
gravel, moist
Stiff 0.3
D
0.4
PROTEST - BOREHOLE REPORT PTP_12376 - UPPER PINBARREN CREEK RD - DCP LOGS.GPJ DRAFT.GDT 18/7/23
D
0.5
0.5
Bore terminated at 0.5 m.
Remarks:
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 70
DYNAMIC CONE PENETROMETER TEST REPORT
CLIENT Viktoria Dioszegi DATE 18/07/2023
PROJECT Tiny House Landslide Risk Assessment COORDINATE SYS
LOCATION 328 Upper Pinbarren Creek Road TESTER JC
PROJECT NUMBER PTP_12376 TEST METHOD AS 1289.6.3.2
CONTRACTOR Protest Engineering
DCP TEST DCP1 DCP TEST DCP2 DCP TEST DCP3 DCP TEST DCP4
E: N: E: N: E: N: E: N:
RL Depth Number of Blows per 100 mm RL Depth Number of Blows per 100 mm RL Depth Number of Blows per 100 mm RL Depth Number of Blows per 100 mm
(m) (m) 5 10 15 20 (m) (m) 5 10 15 20 (m) (m) 5 10 15 20 (m) (m) 5 10 15 20
1
2 1
2
1
1 3
2
1
1 5
1
2
2 6
2
0.5
4
3
3 10
0.5 0.5
5
7
4 10
PROTEST - DCP LOG SHEET (4 PER PAGE) PTP_12376 - UPPER PINBARREN CREEK RD - DCP LOGS.GPJ DRAFT.GDT 18/7/23
0.5
13
4 10
10
11
5 16
16
15
1.0
16
8 15
14
18
27/ mm >> 15
1.0 1.0
23
20 / mm
26/ mm >>
1.5 1.0
Remarks:
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 71
LANDSLIDE HAZARD MACGREGOR & TAYLOR
Appendix B1
LANDSLIDE FREQUENCY ANALYSIS Analysis No.:
NATURAL SHALLOW LANDSLIDES
LOCATION: Site No. Site name:
1 Basic Frequency 6 Concentration of surface water
2 Slope Angle Site Level Factor
Ridge L 0.7
Site Level Factor Crest M 0.8
Less than 5 degrees L 0.1 Upper slope M 0.9
Between 5 and 15 degrees M 0.5 Mid slope H 1.2
✔ Between 15 and 30 degrees M 0.8 ✔ Lower slope H 1.5
Between 30 and 45 degrees H 1.2
More than 45 degrees M 0.8 7 Evidence of groundwater
3 Slope Shape Site Level Factor
None apparent L 0.7
Site Level Factor ✔ Minor moistness M 0.9
Crest or ridge L 0.7 Generally wet H 1.5
✔ Planar M 0.9 Surface springs VH 3
Convex M 0.9
Concave H 1.5 8 Evidence of instability
4 Site geology Site Level Factor
✔ No sign of instability L 0.5
Site Level Factor Trees bent H 1.5
Volcanic rock H 1.1 Minor irregularity VH 2
✔ Sedimentary rock M 1 Major irregularity VH 5
Low grade metamorphic rock M 1 Scarps VH 10
High grade metamorphic rock L 0.9
Granitic rock M 1 Summary
Factor
5 Material strength 2 Slope Angle 0.8
3 Slope Shape 0.9
Site Level Factor 4 Site geology 1
Rock at surface VL 0.1 5 Material strength 0.9
Residual soil < 1 m deep L 0.5 6 Concentration of surface water 1.5
✔ Residual soil 1-3 m deep M 0.9 7 Evidence of groundwater 0.9
Residual soil >3 m deep H 1.5 8 Evidence of instability 0.5
Colluvial soil < 1 m deep H 1.5
Colluvial soil 1-3 m deep VH 2 9 Relative Frequency (2x3x4x5x6x7x8) 0.44
Colluvial soil > 3 m deep VH 4
Fill (slope regrading) VH 5 Site Frequency (1 x 9) 0.44
60 Australian Geomechanics September 2001
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023
Page 72
PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007
114 Australian Geomechanics Vol 42 No 1 March 2007
Document Set ID: 22574699
Version: 1, Version Date: 07/09/2023