Newland Developers Pty Ltd Level 1 Inspection and Testing, Stage 101, Warralily Armstrong Creek ...

37 Pages·2016·1.69 MB·English

by  Sotir Stojcevski

Newland Developers Pty Ltd
Level 1 Inspection and Testing, Stage 101,
Warralily Armstrong Creek Development

GEOTABTF08569AE-CD Rev01
21 April 2016
This page has been left intentionally blank
Level 1 Inspection and Testing, Stage 101, Warralily Armstrong
Creek Development

Prepared for
Newland Developers Pty Ltd
497 Blackburn Rd
MT WAVERLEY VIC 3149
Prepared by
Coffey Geotechnics Pty Ltd
Level 1, 436 Johnston Street
Abbotsford VIC 3067 Australia
t: 9290 7000
ABN: 93 056 929 483

21 April 2016
Attn: Martin O’Hanlon
Document authorisation
Our ref: GEOTABTF08569AE-CD Rev01
For and on behalf of Coffey

Sotir Stojcevski
Principal Geotechnician, Earthworks Team Leader

Quality information
Revision history
Revision Description Date Author Reviewer Signatory
00 Level 1 Report 21.04.2016 Sotir David Annan Sotir
Stojcevski Stojcevski

Distribution
Report Status No. of copies Format Distributed to Date
Rev00 1 PDF Martin O’Hanlon 12.04.2016
Rev01 1 PDF Martin O’Hanlon 21.04.2016

Coffey Geotechnics Pty Ltd
i
ABN: 93 056 929 483
Table of contents
2. Project Summary ......................................................................................................................... 1
3. Specification/work instructions .................................................................................................... 1
4. Fill Material .................................................................................................................................. 2
5. Earthworks ................................................................................................................................... 2
5.1. Subgrade assessment ...................................................................................................... 2
5.2. Fill construction ................................................................................................................. 2
6. Survey data and fill thickness ...................................................................................................... 3
6.1. Western Pad...................................................................................................................... 3
6.2. Central Pad ....................................................................................................................... 3
6.3. Eastern Pad....................................................................................................................... 3
6.4. Southern Pads................................................................................................................... 3
7. Testing and Results ..................................................................................................................... 4
7.1. Density testing ................................................................................................................... 4
7.2. DCP testing ....................................................................................................................... 4
8. Statement of Compliance ............................................................................................................ 5

Figures
Figure 1 ..................................................................................................... Site plan with test locations
Figure 2 ........................................................................................................ Summary of Test Results
Figure 3 ...................................................................................................................................... Photos

Appendices
Appendix A ........................................................................................................ Laboratory Test Reports
Appendix B ............................................................................................................................ Surrey Data
Appendix C ......................................................................................................................... Specifications

Coffey Geotechnics Pty Ltd
ii
ABN: 93 056 929 483
Level 1 Inspection and Testing, Stage 101, Warralily Armstrong Creek Development
1. Introduction
This report presents the results of the Level 1 Inspection and Testing for fill placement within Stage
101 of Warralily Estate Armstrong Creek Development, undertaken by Coffey Geotechnics Pty Ltd
(Coffey).
The works were commissioned by Martin O’Hanlon of Newland Developers Pty Ltd (Newland).
2. Project Summary
We understand that Newland requires fill placement within Stage 101 of the Warralily Armstrong
Creek Development in the areas as shown in Figure 1, to be constructed under Level 1 Inspection
and Testing undertaken by a Geotechnical Inspection and Testing Authority (GITA).
Level 1 Inspection and Testing, as defined in AS3798-2007 “Guidelines on Earthworks for
Commercial and Residential Development,” provides for full time inspection of the construction of
controlled fill and field and laboratory testing in accordance with AS1289 “Methods of Testing Soils for
Engineering Purposes”.
The Level 1 Inspection was undertaken by geotechnical professionals from Coffey over the following
three periods:
• 15 June 2015 to 1 July 2015;
• 10 August 2015 to 14 August 2015;
• 27 November 2015 to 1 December 2015.
The earthworks contractor for the project was Winslow Constructors Pty Ltd (Winslow). Coffey
undertook the compaction control testing in their NATA accredited laboratory, as part of the Level 1
Inspection and Testing process.
This report is applicable to fill placed by Winslow within Stage 101 of the Warralily Development in the
areas shown in Figure 1. The filling areas encompass the fill platforms as follows:
• Western Pad - Lot 10117 to 10124 and six additional Lots within the future Stage 102
adjacent to north of Stage 101;
• Central Pad – Lot 10129 to 10134 and the northern areas of Lots 10125 and 10126;
• Eastern Pad – small area within the western parts of Lots 10139 and 10140;
• Southern Pads – areas within lots to the south of Warralily Boulevard – Lots 10101 to 10104,
small parts of Lots 10105 to 10114 and Lots 10115 to 10116.
This report does not include fill other than where mentioned in this report or any other fill that may be
placed during this period or subsequent periods at or surrounding the subject site. Excluded works
comprise trench backfill, foot paths, landscaping fill and placement of topsoil.
3. Specification/work instructions
The specification for the project was prepared by SMEC Australia Pty Ltd (SMEC) for Armstrong
Creek Development Corporation Pty Ltd under reference number 0557ESB-34A-03 Rev B. Extract of
the specifications were provided to Coffey in an email sent by Shane McGlynn from SMEC on 5
October 2012. The extract of the specified requirements is provided in Appendix D and a short
summary is provided below:
Coffey
GEOTABTF08569AE-CD Rev01
21 April 2016
Level 1 Inspection and Testing, Stage 101, Warralily Armstrong Creek Development
• All filling in excess of 300mm depth within the building envelope of allotments shall be
undertaken to specifications satisfying the requirements of AS 3798-1996 “Guidelines on
Earthworks for Commercial and Residential Development”.
• All such filling works shall be undertaken with supervision to the standard detailed as “Level 1
Inspection and Testing” in AS 3798-2007, such that the supervisor will issue a notice detailing
that the works comply with the specifications and drawings.
• Material to be used for fill construction shall satisfy the requirements of AS 3798-2007
• Fill to be compacted in near horizontal layers not exceeding 250mm loose thickness
• Compaction to achieve a dry density ratio of at least 95% Standard; and
• Moisture content of the fill material is to be within ±3% of the Standard Optimum Moisture
Content (SOMC).
4. Fill Material
Fill used for the construction of Stage 101 comprised of locally sourced clay from existing stages and
future stages from the Armstrong Creek Development. No organic or deleterious matter was observed
within the fill placed within the engineered fill platforms. Oversize material was removed from the fill
platforms during placement where possible.
5. Earthworks
The earthworks for this project included the following operations:
• Stripping of topsoil;
• Assess subgrade condition;
• Proof rolling of subgrade;
• Subgrade ripping and moisture conditioning prior to the placement and compaction of fill;
• Placement and compaction of engineered fill to construct engineered fill platforms.
5.1. Subgrade assessment
The subgrade was progressively assessed following removal of topsoil. Topsoil was removed by use
of scrapers. Proof rolling of the subgrade indicated no soft spots were encountered prior to placement
of the fill. Roots and organic matter were removed where observed during the assessment process.
The soils present within the subgrade comprised natural very stiff to hard silty clay and clayey silt.
5.2. Fill construction
Fill material was placed generally in loose layers varying in thickness from 200mm to 250mm.
Compacted layers were approximately 150mm to 200mm thick.
All sourced fill was trucked in and spread with an excavator. A water cart, a pad foot roller and a
compactor were present onsite during works for conditioning and compacting.
Coffey
GEOTABTF08569AE-CD Rev01
21 April 2016
Level 1 Inspection and Testing, Stage 101, Warralily Armstrong Creek Development
Coffey’s Level 1 Inspector was on site on a full time basis during the placement, compaction and
testing of the fill on the dates noted in Section 1 of this report. Coffey was not present on site over a
period between 1 July to 10 August 2015 and between 14 August to 27 November 2015. Coffey
understands that Winslow did not place any fill within the platforms during these or any other
subsequent period when the Level 1 personnel was not present on the site.
6. Survey data and fill thickness
Winslow’s appointed surveyor Survey Management Solutions (SMS) conducted a survey of the site
during the earthworks. SMS’s survey plan is provided in Appendix B of this report under reference
“Warralily Stage 101 Fill Details’ Rev D, dated 23 February 2016.
The SMS survey plan shows a thickness of the fill placed above subgrade level.
6.1. Western Pad
Based on the survey data in Appendix B, fill placed within the Western Pad varied in thickness from
0.34m in the eastern parts to 0.95m in the western parts of the pad. The maximum engineered fill
thickness measured was 0.95m.
Our Level 1 GITA records indicate that between 3 and 5 layers of engineered fill were placed in the
Western Pad which results in maximum compacted layer thickness of 0.19m. The produced layer
thickness is in compliance with the project specifications.
6.2. Central Pad
Based on the survey data in Appendix B, fill placed within the Central Pad varied in thickness from
0.30m in several parts to 0.65m in the northern parts of the pad. The maximum engineered fill
thickness measured was 0.65m.
Our Level 1 GITA records indicate that between 1 and 2 layers of engineered fill were placed in the
Central Pad which results in maximum compacted layer thickness of 0.325m. The produced layer
thickness is exceeding the project specified thickness of 0.25m and Dynamic Cone Penetrometer
(DCP) testing has been carried out to assist with assessing the fill consistency in these areas (Section
7.2).
6.3. Eastern Pad
Based on the survey data in Appendix B, fill placed within the Eastern Pad was 0.25m thick. This was
placed in a single layer with a maximum engineered fill thickness of 0.25m.
Our Level 1 GITA records indicate that 1 layer of engineered fill was placed in the Eastern Pad which
results in maximum compacted layer thickness of 0.25m. The produced layer thickness is in
compliance with the project specifications.
6.4. Southern Pads
Based on the survey data in Appendix B, fill placed within the Southern Pads varied in thickness from
0.18m in several parts to 0.35m in the eastern and western parts of the pads.
Our Level 1 GITA records indicate that between 1 and 3 layers of engineered fill were placed in the
Central Pad which results in maximum compacted layer thickness of 0.18m. The produced layer
thickness is in compliance with the project specifications.
Coffey
GEOTABTF08569AE-CD Rev01
21 April 2016
Level 1 Inspection and Testing, Stage 101, Warralily Armstrong Creek Development
7. Testing and Results
7.1. Density testing
Field density testing was undertaken progressively on the compacted fill. Testing was undertaken
under the following frequencies:
• 1 test per material type per layer per 2500m² or 1 test per 500m³ or 3 tests per lot – whichever
requires most tests in accordance with Type 1 Earthworks (large scale operations) as defined
in Table 8.1 of the AS 3798-2007.
• 1 test per layer or 1 test per 200m³ distributed reasonably evenly throughout the fill depth or 1
test per residential lot – whichever requires the most tests in accordance with Type 2
Earthworks (small scale operations) as defined in Table 8.1 of the AS 3798-2007.
The field density testing was conducted by Coffey’s personnel on site. All laboratory testing was
performed in Coffey’s NATA accredited laboratory. A Hilf compaction test was performed for each
field density test.
A total of 45 field density tests were performed during the earthworks as presented in Figure 1. Ten
(10) of the forty five (45) tests did not meet the specified criteria and these areas were subsequently
re-worked and re-tested. Once retested, all test results met the specified dry density ratio criteria of
95% Standard and moisture variation of ±3% of the Optimum Moisture Content (OMC).
A summary of the test results obtained from the field density testing within the Stage 101 fill platforms
is provided in a table presented as Figure 2. The laboratory test reports of the field density tests are
presented in Appendix A.
7.2. DCP testing
As discussed in Section 6. to assist in determining the consistency of the soils within the Central Pad
in parts of the pad where the survey spot levels indicated fill layers in excess of 0.2m compacted
thickness, Coffey’s personnel conducted 5 Dynamic Cone Penetrometer (DCP) tests from the finished
surface on 15 April 2016.
The DCP tests returned results between 2 and 22 blows (typically 4 to 10) per 100mm penetration.
Tests were conducted to a depth of 0.8m which based on the survey data, extended into the natural
subgrade. Table 1 shows the results of the DCP testing. The locations of the DCP tests are shown in
Figure 1.
Table 1: DCP test results
DCP # DCP1 DCP2 DCP3 DCP4 DCP5
Lot # 10134 10134 10134 10125 10125
Depth below Blow counts of DCP per 100mm penetration
GL (mm)
100 2 2 3 2 2
200 4 16 7 6 11
300 4 10 8 22 10
400 4 9 11 7 7
500 10 11 7 8 6
600 7 7 7 11 6
700 9 6 12 8 6
800 10 13 12 7 6
Coffey
GEOTABTF08569AE-CD Rev01
21 April 2016
Level 1 Inspection and Testing, Stage 101, Warralily Armstrong Creek Development
8. Statement of Compliance
Coffey personnel have provided Level 1 Inspection and Testing services during the construction of the
engineered fill areas within Stage 101 as shown in Figure 1. A geotechnical professional from Coffey
(Level 1 Inspector) was on site on a full time basis during subgrade assessment and fill placement,
and observed the construction techniques adopted.
Based on observations made by Coffey’s Level 1 Inspector and the results of field and laboratory
tests, Coffey consider that the engineered fill area within Stage 101 constructed by Winslow to the
levels indicated in Section 6, as far as we have been able to determine, has been placed in general
accordance with the intent of the specification.

Coffey
GEOTABTF08569AE-CD Rev01
21 April 2016
LEGEND
#40
#38 Approximate Location of Layer 1 tests
#41
Approximate Location of Layer 2 tests
#43
#44
#26 Approximate Location of Layer 3 tests
#33 #36
#39
#5 Approximate Location of Layer 4 tests
#8
#25 #45
#35
#31
#34 Approximate Location of Layer 5 tests
#16
#22 #9 #42
#10 Approximate Location of Layer 6 tests
#24 #4 #15 #14 #28
#30
#37
#6 Approximate Location of Layer 7 tests
#2 Western Pad
#11 #1 #18
Eastern Pad
#12 #13
Central Pad
#3
#17 #7
#19 #21
Southern Pads
#20 #23
#29
#32
#27 Exclusion Zones
Site Plan extracted from SMEC Urban Development drawing under reference:
Stage 101, Roadworks and Drainage, Layout Plan – 1, Drawing No. 0900ESD-101-03
drawn RB client: NEWLAND DEVELOPERS PTY. LTD.

approved SS project: Stage 101
WARRALILY ARMSTRONG CREEK DEVELOPMENT
date 03.03.2016
scale NTS title: FIELD DENSITY TEST LOCATION PLAN
osirzigei nal A4 project no: GEOTABTF08569AE-CD figure no: FIGURE 1