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Approved Plan & Document OPW21-354
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Plans and drawings
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Log in to see the plans as drawn EARTHWORKS VOLUME
CUT: 316m³ OP WORKS
300mm MIN
FILL: 308m³
ISSUE
VIP RL 114.011
BALANCE: 8m³ CUT WATER LEVEL RL 13.2
VIP RL 113.5
VIP RL 113.5
TREES TO BE REMOVED
A
VIP RL 111.977
VIP RL 112
VIP RL 112
1x WATTLE
2x GUM
od
wo
od
B
Blo
DATUM RL 110.000
N
ATIO
GET
HORIZONTAL CURVES L38.71
E
OF V
Wattle
11
E
EDG
3. VERTICAL CURVES L8.02 L5.25 L9.68 L3.8 L2.9 L4.64 L4.43
00
Gum
-9.7% -38.3% 0% 39.5% 0% -32.8% -9.7%
m
VERTICAL GRADES
Gu
L8.02 L5.25 L9.68 L3.8 L2.9 L4.64 L4.43
114.786
114.011
113.251
112.000
112.000
112.000
113.500
113.500
113.383
111.977
111.549
DESIGN
11
.5 3
114.586
114.011
113.819
113.528
113.111
112.841
112.519
112.390
112.374
111.981
111.534
0 SURVEY
Depth
-0.568
-1.528
-1.111
-0.841
-0.004
0.200
0.000
0.981
1.110
1.009
0.014
11
.0 2
11 CHAINAGE
13.267
22.946
26.744
29.643
38.713
0
8.016
34.28
4.
10
20
30
0
00
A-A - LONGITUDINAL SECTION
1
A1 HORZ SCALE 1:100
12
A1 VERT SCALE 1:50
50 .
11
.5 4
0 WATER LEVEL RL 13.2
VIP RL 113.497
VIP RL 113.5
VIP RL 113.5
VIP RL 113.5
VIP RL 113.341
VIP RL 113.037
11
5.
VIP RL 112
VIP RL 112
00
11
3.
LINE OF CUT-FILL DATUM RL 111.000
50
11
1.
50
HORIZONTAL CURVES
B
L41.7
1
14 VERTICAL CURVES L6.98 L0.5 L3.43 L3.89 L15.51 L3.81 L3.12 L1.43 L3.03
.0
-0.8% 31.2% 0.1% -38.5% 0% 39.4% 0% -32.4% -2.1%
A
0
VERTICAL GRADES L6.98 L0.5 L3.43 L3.89 L15.51 L3.81 L3.12 L1.43 L3.03
113.394
113.341
113.497
113.499
113.500
112.000
112.000
112.000
112.000
113.500
113.500
113.037
113.008
112.972
DESIGN
11
113.401
113.341
113.336
113.312
113.304
113.248
113.240
113.145
113.143
113.123
113.071
113.038
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Full text of the other 8 sections
Section 2
113.008
112.964
4. SURVEY
50
Depth
-0.007
-1.248
-1.240
-1.145
-1.143
-0.002
0.000
0.162
0.187
0.196
0.377
0.429
0.000
0.008
CHAINAGE
14.802
30.308
34.117
37.237
38.667
41.699
6.977
7.477
10.91
11
10
20
30
40
0
5. B-B CROSS - LONGITUDINAL SECTION
A1 HORZ SCALE 1:100
A1 VERT SCALE 1:50
WEIR CREST RL 13.2 3m
1m
300mm
500mm
STORMWATER CATCHMENT 1m
AREA: 0.467Ha
500mm
Fi: 13.6% EXISTING
###
1/02/2022
276~41'50"#
#
11
'55"###
44.888#
2.
00
36.875#
SURFAC
259~49
tc = 13 Min 1V:4H E MAX
11
0.
50
1V:3H EA ID: 2557785
RPEQ: 26443
11
Itc (1 IN 1000): 319.4mm/hr
4.
50
1.2m
ood
odw
Blo
11
# 5.
## 00
"# 7#
'51 .40
Wattle
47 34
11
2~ 3.
22 00
1V DO NOT SCALE, IF IN DOUBT ASK!
Gum
Gum
:1
1
15
RATIONAL METHOD
113
. 50
. 50
H
11
2.
00
11
4.
SPILLWAY SECTION
00
11
1hrI10: 70.2mm/hr
2.
50
1.5m
114
. 50
11
6.
50
11
5.
C10: 0.74
00
11
3.
50
11
11
1.
7.
00
50
1
14
. 00
Fy: 1.2
117
. 50
11
4.
50
11 #
6. "###
Climate change factor: 1.2
50 18'20
48# 343~
102.5
11
5.
00
Qy = 1/360 * 0.467 * (1.2*0.74) * 319.4 * 1.2
= 0.44m³/s
11
4.
COMPACTED CLAY IMPERMEABLE
50
115
11
. 00
7.
0
0
CORE ZONE TO DEPTH OF 3/4
KEY IN ADDITIONAL 300mm
#
WEIR CAPACITY (TRAPEZOIDAL) A 31/01/22 OP WORKS ISSUE BP NW
# "###
EMBANKMENT HEIGHT BELOW BASE
31 '25
6.0 42
14 2~
31
117 . 00
DEPTH OF ROCK AT HEEL Rev Date Description By Chk
Qmax = 1.7*b*H^1.5 + 1.26*m*H^2.5
1
18 .
50
b: 1.2m AND TOE OF SPILLWAY
H: 0.3m
#
###
2.6 50"
34#
SPILLWAY ELEVATION
07'
76~
12
0
45# #
m (1V:mH): 4
###
50
.
30"
00'
5.8
60~
EARTHWORK NOTES
Qmax: 0.584m³/s
##
##
0" 2#
5'3 .32
~5 19
42
Qmax >= Qy: OK 1. ALL EARTHWORKS ARE TO BE CARRIED OUT IN ACCORDANCE WITH "GEOTECHNICAL ASSESSMENT PROPOSED DAM" DATED 18 NOVEMBER
[email protected]
2021 BY TECTONIC.
#
### #
10" 161
16' 11.
30~
2. FOLLOWING STRIPPING AND EXCAVATION TO DESIGN LEVELS, PROOF ROLL TO IDENTIFY ANY SOFT SPOTS. SOFT SPOTS TO BE EXCAVATED 37 MARY ST NOOSAVILLE, QLD
MAX VELOCITY (MANNINGS)
AND REPLACED WITH SELECT FILL. 07 5211 1003
V = (R^0.66 * S^0.5)/n
3. OPTIONAL TREATMENTS TO PREVENT LEAKAGE: Client
MAX DEPTH (DRAINS): 0.13m TLR ENTERPRISES PTY. LTD.
3.1. MIXTURE OF 200-400mm THICK LAYER OF INERT/NON-REACTIVE MATERIALS AT SUBGRADE
R: 0.098 3.2. MIX SUBGRADE WITH GYPSUM AT RATES CONFIRMED BY AGRONOMY ASSESSMENT (2.5t/ha INDICATIVE) Project Name
S: 0.3333 3.3. GEOSYNTHETIC LINER (HDPE) TO BE INSTALLED BENEATH BASE OF DAM
8 ROBIN PLACE
n: 0.05 4. FILL TO BE COMPACTED AT +1-2% OPTIMUM MOISTURE CONTENT FOR STANDARD COMPACTION LAKE MACDONALD
(LINED CHANNEL, ANGULAR ROCK) 5. FILL PLACED IN LAYERS MAXIMUM 150mm TO 200mm THICK (LOOSER THICKNESS) AND COMPACTED WITH AT LEAST 4TO 6 PASSESS BY PAD
Vmax: 2.5m/s FOOT COMPACTOR OR SIMILAR TO ACHIEVE DRY DENSITY RATIO OF MINIMUM 95% MAX DRY Section 3
DENSITY Title
BULK EARTHWORKS PLAN
NOOSA COUNCIL 6. INSPECTION AND TESTING OF FILL TO BE CARRIED OUT IN ACCORDANCE WITH AS3798, WITH FILL CARRIED OUT UNDER LEVEL 2
GEOTECHNICAL SUPERVISION
APPROVED PLAN
7. SPILLWAY TO BE COMPRISED OF ANGULAR ROCK OF MEAN 200mm DIAMETER WITH VOIDS BACKFILLED WITH SOIL TO FORM A DENSE
WELL-GRADED MASS TO A MINIMUM DEPTH OF 200MM
OPW21/0354 28 MAR 2020
8. TEMPORARY OPEN SWALES AND DIVERSION DRAINS TO BE PLACED UPSTREAM OF EARTHWORKS DURING CONSTRUCTION TO PROTECT
EXCAVATION Project No. Discipline Status
20210060 CIVIL OPW
Designed By Drawn By Scale
(at
BRP BRP 1:100 A1)
Drawing No. Revision
C10 A
Section 4
NOOSA COUNCIL APPROVED DOCUMENT OPW21/0354 28 MAR 2020 [OCR of page images] NOOSA COUNCIL North Coast APPROVED DOCUMENT MAsivroamenta OPW21/0354 28 MAR 2020 Services Environmental Management Consultants PROJECT: J000988 Friday, 26 November 2021 Tony Rossiter Via Email: [email protected] Dear Tony, RE: Proposed Dam impact to Native Vegetation — 8 Robin Place Lake MacDonald QLD North Coast Environmental Services undertook a site investigation on Monday 22"4 November 2021 to assess the ecological values present within and adjoining the proposed dam footprint at 8 Robin Place Lake MacDonald (Lot 13 SP315578). Lot 13 was recently created as part of a rural residential subdivision (Council Ref: OPW20/0051) and vegetation at the rear of the lot was subsequently registered under conservation covenant. It is understood you are the new owner of Lot 13 and you wish to construct a dam in the north of the lot within approximately 20m of the covenant edge. The plan of the dam presented to us for assessment purposes is presented as Attachment 1. No material impact is expected to the covenant vegetation given its separation of 20m from the nominated position of the dam. It is noted that you informed us that the dam linework in Attachment 1 represents the centre of the top of bank of the dam. Further, the geotechnical assessment by Tectonic has recommended the batters of the dam be constructed at 1:3 grade on the downslope side of the dam and 1:2 on the high side. We have therefore assessed that the required downslope batter of the dam would extend approximately 6m from the delineated top of bank in Attachment 1 on the assumption that the top of bank RL would be approximately 2m above ground RL Yas per your advice on site). Consequently, approximately 14m separation is anticipated post dam construction between the toe of the dam batter and the adjacent covenant boundary. Whilst the covenant vegetation will not be impacted, a small copse of native trees are present between the nominated dam location and the covenant boundary and are captured under the Noosa Plan as being within a native vegetation area. These trees were not captured in the covenant under the subdivision due to their non-remnant status and given they were scattered amongst a slash pine infestation which has since been cleared to satisfy the DA conditions. Plate 1 identifies the conditions within and abutting the proposed dam and the extent of trees anticipated to be directly impacted. The trees comprise regrowth trees over a grassy understorey dominated by /mperata cylindrica along with some regrowth saplings of mixed native species. PO Box 9566 Pacific Paradise QLD 4564 ABN 60 625 108 625 1 | Page
Section 5
Services Environmental Management Consultants North Coast siurcnmenta PROJECT: J000988 Surveyed edge of vegetation (approx. ) Was i Pipe: eee E Plate 1 - Affected Trees (red line denotes approx. toe of dam batter) Based on a 6m batter slope length on the downslope side of the dam as depicted in Plate 1, the following trees are likely to be required to be removed due to either direct clearing needs or the likelihood of becoming non- viable as a result of filling over their root zones and about their trunks: 2 x Eucalyptus grandis (approx. 16m high/400-450mm dbh); 1 x Corymbia intermedia (6m/100mm); 3 x Acacia melanoxylon (4m, 6m and 8m/100mm, 100mm and 300mm) 1 x Lophostemon confertus (8m/100mm) Extension of the batter any further than 6m from the pegged alignment on site would impact the surveyed edge of vegetation shown in Appendix 1 and Plate 1 and which is characterised by a population of Commersonia bartramia to 10-14m height. It is therefore recommended the final position of the dam be designed to ensure retention of the vegetation edge characterised by the Commersonia’s. The stand of impacted trees comprise least concern species which are common in the local area. The trees all exhibit regrowth structural characteristics and were not observed to be host to any hollows or nests at the time of inspection. Whilst the trees inherently influence the microclimate of the nearby covenant vegetation it is considered their removal will not alter the viability of the covenant area to be able to continue support the in-situ local flora and fauna, particularly given the extent of mixed open forest and rainforest regrowth canopy trees that would be retained between the dam PO Box 9566 Pacific Paradise QLD 4564 ABN 60 625 108 625 2 | Page
Section 6
North Coast Environmental Services Environmental Management Consultants PROJECT: J000988 and the covenant vegetation that will offer increasingly shaded conditions to the covenant edge over time. The impact of the tree clearing can be countered via the provision of a compensatory biodiversity offset. In this instance it could be appropriate to provide a direct revegetation offset within the denuded area in the north-west corner of the lot adjacent to the covenant boundary (refer Plate 2). Slee ii Oe © 2 Plate 12— Suitable Offset location Determination of an appropriate scale of revegetation is matter to be negotiated with Council but should at a minimum comprise a 1:1 clearing to offset ratio with trees planted at appropriate densities and maintained for a period of time until considered successfully established. Should you have any queries regarding this matter please do not hesitate to contact me. Sincere regards, LZ, - a Joshua Lee - Director B. Sc. Australian Environmental Studies (Ecology, Land & Water, Pollution & Health) mEIANZ, mFPAA, mESA Ph: 07) 5450 5652 | Email: [email protected] PO Box 9566 Pacific Paradise QLD 4564 ABN 60 625 108 625 3| Page
Section 7
Services Environmental Management Consultants North Coast A Environmental PROJECT: J000988 Attachment 1 — Plan of Proposed Dam PO Box 9566 Pacific Paradise QLD 4564 ABN 60 625 108 625 4|Page
Section 8
oY is SURVEY CONTOUR & DETAIL ISURVEY Lot 13 on SP315578 ls Robin Place Lake MacDonais Tony Rossiter H2105A TEM ‘Screw in Kerb AL 120.647
Section 9