Great Western Highway Upgrade - Medlow Bath - Surface and Groundwater Impact Assessments May 2021
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Great Western Highway Upgrade - Medlow Bath Surface and Groundwater Impact Assessments May 2021
Mott MacDonald
383 Kent Street
Sydney
NSW 2000
PO Box Q1678
QVB Sydney NSW 1230
Australia
T +61 (0)2 9098 6800
mottmac.com
Great Western Highway
Transport for New South
Wales
Upgrade - Medlow Bath
Surface and Groundwater Impact Assessments
May 2021
Mott MacDonald Australia Pty Limited is a
subsidiary of Mott MacDonald
International Limited. Registered in
Australia, ABN 13 134 120 353
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath i
Surface and Groundwater Impact Assessments
Issue and Revision Record
Revision Date Originator Checker Approver Description
A 03/03/2021 J. Mail S. Reilly Coordination Draft
B 25/05/2021 J. Mail S. Reilly N. Wade Technical Paper Issue
Document reference: 419899 | 02 | B
Information class: Standard
This document is issued for the party which commissioned it and for specific purposes connected with the above-
captioned project only. It should not be relied upon by any other party or used for any other purpose.
We accept no responsibility for the consequences of this document being relied upon by any other party, or being
used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied
to us by other parties.
This document contains confidential information and proprietary intellectual property. It should not be shown to other
parties without consent from us and from the party which commissioned it.
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath ii
Surface and Groundwater Impact Assessments
Contents
Executive summary 1
Glossary and Abbreviations 2
1 Introduction 3
1.1 The Proposal 3
1.1.1 Proposed alternative intersection at Bellevue Crescent 4
1.1.2 Transport Accessibility Program 5
1.2 Design 6
1.2.1 Design Criteria 6
1.3 Objectives 7
1.3.1 Program Objectives (GWHUP) 7
1.4 Purpose of the Report 7
2 Methodology 8
2.1 Study Approach 8
2.2 Legislation 8
3 Existing environment 10
3.1 Regional Context 10
3.2 Climate 10
3.3 Land Use 12
3.4 Surface water features 13
3.5 Geology and soils 13
3.6 Groundwater recharge 14
3.7 Registered groundwater users 14
3.8 Groundwater dependent ecosystems 15
3.9 Contaminated sites 17
3.10 Water quality 18
4 Potential impacts 19
4.1 Concept design 19
4.1.1 Drainage design 19
4.2 Construction impacts 20
4.3 Operational impacts 20
4.3.1 Surface water impacts 20
4.3.2 Scour 20
4.3.3 Water quality 21
4.3.4 Groundwater 21
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath iii
Surface and Groundwater Impact Assessments
4.4 Climate change 21
5 Mitigation measures 22
5.1 Construction measures 22
5.2 Operational measures 22
6 Recommendations 25
7 References 26
A. Catchment Mapping 27
B. Drainage Concept Design 28
C. NorBE Assessment Summary 29
D. Protected Matters Report 30
Tables
Table 1.1: Key Design Criteria 6
Table 3.1: Schedule of Cross Drainage Structures 13
Table 3.2: Registered bore data 15
Table 4.1: Drainage Standard of Design Drainage Structures 19
Table 5.1: Mitigation Measures 23
Figures
Figure 1.1: GWH Upgrade Proposal 3
Figure 1.2: Proposed alternative intersection at Bellevue Crescent 4
Figure 3.1: Study Area and Topography 10
Figure 3.2: Average Monthly Rainfall Data 11
Figure 3.3: Average Monthly Temperature Data 11
Figure 3.4: Land Parcels and Aerial Imagery of Land Use 12
Figure 3.5: Registered bores near Medlow Bath 14
Figure 3.6: Sydney Basin Blue Mountains, Grose RIver 16
Figure 3.7: Sydney Basin Blue Mountains, Coxs River 17
Figure 5.1: CD3370 Discharge Mitigation 23
Figure 5.2: CD4220 Discharge Mitigation 24
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath iv Surface and Groundwater Impact Assessments
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 1 Surface and Groundwater Impact Assessments Executive summary A desktop surface and groundwater assessment has been undertaken to assess existing conditions of the Great Western Highway at Medlow Bath, and the potential impact of the road upgrade on the local and regional groundwater system, and water quality reaching watercourses. Existing drainage structures and the flow of runoff has been determined through a separate hydrology and hydraulic assessment, with the standards of these structures vary substantially from approximately 10% AEP to greater than 1% AEP. These catchments comprise a number of pollutant sources including a variety of land use and transport infrastructure. A summary of the main impacts of the proposal as determined through the assessment are noted below: ● The upgrade of Great Western Highway and some local access road improvements would affect the volume and peak runoff rates from the upstream catchments. ● Pollutant loads from the widened road infrastructure will provide increased runoff pollutants from the new road pavements ● New excavation to the road corridor where widening occurs toward the southern end of the proposal will have local impacts on the groundwater levels of the area Upon analysis of the potential impacts the following recommendations are made: ● Provide all runoff discharge locations with level spreaders for limits on the scour potential of runoff entering the existing watercourses ● Runoff discharge locations are proposed to have attenuation basins for mitigation of the discharge peak flows to no greater than under the existing conditions. Bioretention is proposed to be integrated into the basin floor to provide stormwater quality filtration and treatment. ● Consult with Council around the integration of attenuating basin to the Medlow Park masterplan area. The dimensions and depth to be developed in consultation with Council engineers to ensure safe operation of the infrastructure. ● Consult with the owner of groundwater bore near the boundary of the proposal area to understand the access and GW061451 quality requirements of the bore into the future and confirm no adverse impacts. 419899 | 02 | B | May 2021
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Surface and Groundwater Impact Assessments
Glossary and Abbreviations
Term Definition and Abbreviation
AHD Australian Height Datum, the datum of vertical control mapping in metres
AEP Annual Exceedance Probability
ARI Annual Recurrence Interval
EPA Environment Protection Authority
GDE Groundwater Dependent Ecosystems
GWH Great Western Highway
GWHUP Great Western Highway Upgrade Project
NorBE Water quality assessment standard: Not worse or better than (existing conditions)
OEH Office of Environment and Heritage
RCP Reinforced Concrete Pipe
REF Review of Environmental Factors
TfNSW Transport for New South Wales, formerly known as RMS
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Surface and Groundwater Impact Assessments
1 Introduction
1.1 The Proposal
Transport for NSW (Transport for NSW) proposes to upgrade approximately 1.2 kilometres of the Great
Western Highway at Medlow Bath between Railway Parade and approximately 330m south of Bellevue
Crescent (the proposal). This upgrade is part of the Great Western Highway Duplication project
between Katoomba and Lithgow which aims to provide a safer and more efficient link between Central
West NSW and the Sydney Motorway Network for freight, tourist and general traffic.
In addition to the road modifications, the proposal will also improve active transport links and public
transport accessibility.
The proposal is shown in Figure 1.1.
Figure 1.1: GWH Upgrade Proposal
Source: MRB - Medlow Bath Concept Design
Key features of the proposal would include:
● Construction of a four lane divided carriageway with consolidated access points at upgraded
intersections including.
– Upgraded Bellevue Crescent intersection to include three way traffic signals for safe
access/egress
– Provision of a U-turn bay for traffic turning east bound to west bound at Bellevue Crescent
– Right turn bay in east bound carriageway median for Hydro Majestic Hotel (no right turn egress)
– Improvements on Railway Parade to formalise parking provisions, U-turns and commuter parking
● Construction of full depth highway pavement and associated local road, driveway, footpath, kerb and
gutter reconstruction work within the proposal area
419899 | 02 | B | May 2021Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 4 Surface and Groundwater Impact Assessments ● Construction of a new pedestrian bridge that connects Railway Parade, Medlow Bath Station and new indented bus bays on both sides of the Highway in line with Transport Access Program requirements (See 1.1.1) ● Shared use (pedestrian/cyclist) path adjacent to westbound carriageway ● Retaining wall and traffic barrier construction adjacent to existing rail corridor ● Utility relocation and stormwater drainage upgrade as required over length of the project including water quality control measures in Railway Parade ● Provision of 6m raised landscaped median for trees protected with modified redirective kerb. 1.1.1 Proposed alternative intersection at Bellevue Crescent As part of the design for the proposal, a new alternative signalised intersection is being considered to the Great Western Highway with a new road through vacant Lots to connect to the existing Bellevue Crescent and approximately 25 metres south of the United Petrol Station (refer to Figure 1.2). Figure 1.2: Proposed alternative intersection at Bellevue Crescent 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 5
Surface and Groundwater Impact Assessments
Source: MRB - Medlow Bath Concept Design
At the time of writing of this report, an alternative design was being considered for Bellevue Crescent
includes the following key design features:
● A signalised intersection will be built along the southern perimeter of the United Petrol Station in
Medlow Bath utilising a corridor (anticipated to be 20 metres) through vacant Lots.
● Closing the existing Bellevue Crescent and Great Western Highway intersection but still maintaining
a service road/shared zone for the properties fronting the highway
● Creating new access options from Bellevue Crescent to the petrol station Hydro Majestic Pavillion
● Allows left and right turns out of Bellevue Crescent on to the Great Western Highway (enabling west
and east bound movement) and left turn into new Bellevue Crescent from Great Western Highway
westbound
1.1.2 Transport Accessibility Program
The NSW Government is improving accessibility at Medlow Bath Station. This portion of the project is
being delivered as part of the Transport Access Program (TAP), a NSW Government initiative to provide
a better experience for public transport customers by delivering accessible, modern, secure and
integrated transport infrastructure.
As part of this program, the Medlow Bath Station Upgrade (part of the proposal) would provide a station
precinct that is accessible to people with a disability or limited mobility, parents/carers with prams, and
customers with luggage.
The key features of the TAP project included within the proposal are summarised as follows:
● construction of a new pedestrian footbridge including:
– four new lifts to provide access between the footbridge, bus stops on the Great Western Highway,
Station platforms and Railway Parade
– provision of accessible paths between the lifts, stairs and bus stops on the Great Western
Highway
● upgrade of the station entrance on Railway Parade including:
– modifications to the commuter car park along Railway Parade, and provision of new accessible
parking spaces
– provision of a new accessible kiss and ride space on Railway Parade adjacent to the new station
entry
– provision of accessible paths between the footbridge entry, kiss and ride and accessible parking
● upgrade of the station power supply to provide adequate power for the new footbridge and lifts
● modifications to overhead wiring and HV at the station to accommodate the construction of the new
footbridge
● internal station building work including:
– minor building modifications that may be required to accommodate new or upgraded electrical
equipment including a main switchboard, new or upgraded station communications equipment
and other station services
ancillary work including adjustments to lighting, relocation or replacement of existing customer facilities
(platform seating, bins, payphone, Opal card readers, fencing) and improvement to station systems
including additional closed circuit television (CCTV) cameras, hearing loops and wayfinding signage.
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Surface and Groundwater Impact Assessments
1.2 Design
The following sections provide a description of the design criteria, major design features and
engineering constraints of the proposal. These features are based on the concept design and would be
further refined during detailed design.
1.2.1 Design Criteria
The concept design for the proposal was prepared in accordance with the following standards:
● T HR CI 12030 ST Overbridges and Footbridges Design Standard (Transport for NSW, 2020)
● Australian Standards: amended by RMS Supplement (2012)
● Austroads Guide to Road Design (Austroads, 2009) and RMS supplements to the Austroads Guide
● Austroads Road Safety Audit Manual (Austroads, 2009)
● Beyond the Pavement 2020: Urban design approach and procedures for road and maritime
infrastructure planning, design and construction (Transport for NSW Centre for Urban Design, 2020)
● NSW Speed Zone Guidelines (Roads and Traffic Authority of NSW, 2011)
● Road Safety Audit Manual and Checklist (Roads and Traffic Authority of NSW, 2011)
● RMS Delineation Manual (2012)
● RMS Road Design Guide (RMS, undated)
● Soils and Construction – Managing Urban Stormwater, Volume 1 (Landcom, 2004) and Volume 2D
(Department of Environment and Climate Change, 2008). Guide to Road Design – Austroads
(Austroads, 2009).
● Disability Standards for Accessible Public Transport 2002 (DSAPT)
Table 1.1: Key Design Criteria
Design Features Requirement
Number of lanes Typical lane arrangement of two lanes in each direction with some turning lanes (for access to
roads off Great Western Highway and to key commercial places.
Lane widths 3.35m for through lanes and 3.30m for turn lanes (plus lane widening at curves, as required).
Design vehicle for main road Main road alignment - 19 metre B-Double (over 50 tonnes)
Alignment
Design vehicle at intersections Bellevue Crescent (including u-turn) –prime mover and semi-trailer (up to 19 metres)
Right hand turn bay into Hydro Majestic Hotel – service vehicle (upto 8.8m)
Posted Speed Limit Main road alignment - 60km/h
Side roads – 50km/h
Design Speed Main road alignment - 70km/h
Intersection (at Bellevue Crescent) – 60km/h
Turn in to side roads – 60km/h
Median width Southern portion (at Bellevue Crescent intersection) – 5.10 metres southern approach and 1.8
metres for northern approach to allow for right hand turn bay at signals.
Mid portion (at Hydro Majestic Hotel) – typically 5.10m raised median and 1.80 metres at right
hand turn bay into the hotel.
Northern portion (between Hydro Majestic Hotel and Railway Parade) – 1.8 metres
Pavement type Pavement structure which would consist of asphalt over lean mix concrete and consider acoustic
requirements.
Footpaths/cycle paths and Southern portion (at Bellevue Crescent intersection) – includes a shared zone for local traffic only
shared zones (to access 100 to 104 Great Western Highway) and pedestrians and is typically 6.7 metres wide
Mid portion (at Hydro Majestic Hotel) – 2.5 metre shared path on the western side of the road and
pedestrian path from footbridge to bus stop on the eastern side.
Northern portion (between Hydro Majestic Hotel and Railway Parade) – 2.5 metre shared path on
the western side of the road
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Surface and Groundwater Impact Assessments
Design Features Requirement
Pedestrian Bridge To allow safe access to the area, a pedestrian bridge (including stairs and lifts) will be installed to
span from Railway Parade to Medlow Bath Station and then across to the western side of Great
Western Highway (as well as access to the eastern side of the Highway to enable use of bus stop
serviced by east bound services).
Flood Considerations Not considered to be within a flood prone area.
One in 100 Average Recurrence Interval (ARI) Minor and Major Tributary flood under current
climatic conditions.
1.3 Objectives
1.3.1 Program Objectives (GWHUP)
The Great Western Highway (GWH) is a 201-kilometre highway crossing of the Great Dividing Range
through the World Heritage listed Blue Mountains, connecting Bathurst and the surrounding Central
West and Orange regions to Sydney.
Crossing the Great Dividing Range, the GWH follows a narrow and difficult alignment constrained by the
Blue Mountains National Park, steep topography, a railway line and existing towns for which the
highway acts as the main street.
The highway’s topography and constrained two lane carriageway design (which in places is almost 200
years old) results in the following constraints:
● reduces freight efficiency by limiting access for safer and more sustainable high productivity vehicles
● limits access during incidents and natural disasters
● slows travel speeds with limited overtaking opportunities and steep gradients (more than double the
recommended maximum level)
● causes delays of up to 80 minutes in peak times
● has higher than state average crash rates
● impairs amenity for local communities with high through traffic volumes and congestion, and
● Without the GWH Upgrade Program, the infrastructure along the Katoomba to Lithgow section will
continue to face a number of challenges and related impacts.
1.4 Purpose of the Report
The purpose of this report is to provide a detailed analysis for input into the Review of Environmental
Factors (REF), as required under Part 5 of the Environmental Planning and Assessment Act 1979
(EP&A Act). This report summarises the impacts from the operation and construction of the proposed
upgrade on surface water and groundwater including sensitive receptors in accordance with the
assessment requirements for the Great Western Highway Upgrade at Medlow Bath.
This includes:
● Identification of existing surface water and groundwater conditions.
● Assessment of the potential construction impacts as a result of the works.
● Assessment of the potential operational impacts as a result of the works.
● Development of a high-level strategy including mitigation measures for minimising impacts to as a
result of the works.
● Make recommendations for further investigations and opportunities for impact mitigation.
A hydrology and hydraulic assessment has been provided in a separate technical paper detailing the
impacts of the proposal on the drainage and flooding aspects of the proposal, covering changes to the
volumes of runoff anticipated from the contributing catchments.
419899 | 02 | B | May 2021Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 8 Surface and Groundwater Impact Assessments 2 Methodology 2.1 Study Approach The Medlow Bath proposal for upgrade of the Great Western Highway is in the vicinity of multiple tributaries comprising ephemeral streams that feed into the larger river systems of the Coxs River and Grose River. These catchments are predominantly native vegetation with small portions of urban development located adjacent the transport corridor of the GWH and adjacent rail corridor. The proposed upgrade includes changes in the road geometry and widening which creates changes the groundwater table adjacent the cut areas and results in an overall increased paved area. This can change the existing groundwater infiltration and alter the flow paths of surface water as it becomes runoff and is discharged to existing sensitive receivers including environmental communities and adjacent commercial and private properties. To mitigate the changes in these potential water quality risks and to address the requirements of the proposal, this assessment approach includes: ● Collation, analysis and interpretation of the available sensitive ecosystem and groundwater bore data including registered users. ● An assessment of the existing soil and potential contamination conditions, including a review of exiting subsurface strata from geological records and geotechnical data. ● Review of contribution pollutants from the existing catchment ● Preparation of a high-level water quality strategy accounting for both increases and changes in the surface and groundwater transportation. ● Assessment of potential impacts to water quality through the neutral or beneficial effect on water quality (NorBE) assessment tool published by WaterNSW, as a result of the proposal. This assessment was based on the following information: ● Combined digital rail utility plans for the corridor, or DSS data. ● GIS layouts for planning and environmental characteristics of the area, and the proposal area. ● Draft masterplans for the recreational area at Medlow Park. ● CAD Concept Design layout data including preliminary proposed drainage network. ● LiDAR and detailed survey in digital formats from government agencies including Geoscience Australia and TfNSW, respectively. ● Rainfall, groundwater and bore data by the Bureau of Meteorology ● Contaminated land data by the NSW Environment Protection Authority (EPA) 2.2 Legislation Legislation and guidelines relating to works within flood liable land in New South Wales include: ● Environmental Planning and Assessment Act 1979. ● Protection of the Environment Operations Act 1997. ● Protection of the Environment Administration Act 1991. ● Local Government Act 1993. ● State Emergency Service Act 1989. ● State Emergency and Rescue Management Act 1989. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 9 Surface and Groundwater Impact Assessments ● Water Act 1912. Licencing through OEH is required (under Section 112 of the Water Act 1912) prior to the installation of any bores for potential purposes of investigation, extraction, dewatering, testing or monitoring during construction. ● Water Management Act 2000. ● Water Sharing Plan for the Greater Metropolitan Region Groundwater Sources 2011 ● The State Environmental Planning Policy (Sydney Drinking Water Catchment) 2011 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 10 Surface and Groundwater Impact Assessments 3 Existing environment 3.1 Regional Context The Great Western Highway traverses a ridgeline running approximately north to south between the Grose River catchment to the east and the Coxs River catchment in the west. Local watercourses in the vicinity of the study area comprise Adams, Young and Rocky Creek tributaries of the Grose River, and Pulpitt Hill and Back Creek tributaries of the Coxs River. The study area covers 10.58ha including Medlow Bath station and transport interchange, as well as Medlow Park to the east and downstream of the major sag location and cross drainage structures for the transport corridor. This major sag just south of the existing railway station collects runoff from the majority of the study area and directs the flow to the receiving Adams Creek to the west. Smaller portions of the study area drain to the remaining watercourses. Figure 3.1 indicates the topographical features in the vicinity of the study area, including the location of receiving watercourses. Figure 3.1: Study Area and Topography Source: Open Topo Map by OpenStreetMap 3.2 Climate Average monthly rainfall for the nearest rainfall station at Katoomba (063039, Murri Street) indicates the area experiences larger summer rainfalls than during the winter months. This is indicated in the Figure 3.2 average monthly plot, with the annual average rainfall at 1400mm across the 134 year record. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 11 Surface and Groundwater Impact Assessments Figure 3.2: Average Monthly Rainfall Data Source: Bureau of Meteorology Climate Data (2021) The average monthly minimum and maximum temperatures are displayed on Figure 3.3 showing the variability throughout the year based on the full 92 year record at Katoomba, approximately 4km from the study area. Figure 3.3: Average Monthly Temperature Data Source: Bureau of Meteorology Climate Data (2021) 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 12 Surface and Groundwater Impact Assessments 3.3 Land Use The central corridor of Medlow Bath comprises the road and adjacent rail corridor in a north-south alignment, with a predominantly commercial land use immediately adjacent to the road corridor on the western side of the transport corridor. Beyond the rail alignment to the east is predominantly a residential land use with community and recreational uses also. The Medlow Park recreational area is included within the study area, for which a Medlow Park - Draft Plan of Management for Adoption (Blue Mountains City Council, March 2013) study indicates the future objectives for the site. Figure 3.4: Land Parcels and Aerial Imagery of Land Use Source: RPS Concept Design spatial mapping 419899 | 02 | B | May 2021
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Surface and Groundwater Impact Assessments
3.4 Surface water features
The table below indicates the existing cross drainage structures along the GWH providing capture and
conveyance of upstream runoff. These culverts have been identified from the detailed survey
information including the invert level, position and dimension of the culvert.
Table 3.1: Schedule of Cross Drainage Structures
Cross drainage Chainage Existing Invert inlet Invert outlet
structure
CX3480 3480 1 x 375mm RCP 1059.390 1058.990
CX3770 3770 1 x 450mm RCP 1056.409 1056.095
CX3960 3960 1 x 450mm RCP 1053.341 1053.016
CX4200 4200 1 x 450mm RCP 1048.542 1047.894
CX4220 4220 1 x 375mm RCP 1048.580 1048.470
*RCP Reinforced Concrete Pipe
The hydrological standard of the culvert is theoretical and the actual performance relies on the degree
to which sediment and debris build-up and vegetation intrusion prevents the free draining flow through
the stormwater system. The hydrological standard has been assessed through the development of an
existing conditions DRAINS model, inclusive of the regional catchments delineated by review of LiDAR
and detailed survey, and key features of the stormwater drainage system comprising:
● Pipes
● Culverts
● Open channels
● Headwalls
The catchments are mapped in GIS and attached in Appendix A. Due to the small and urban nature of
the upstream catchments, the flow regime reflecting the critical storm conditions are consistently short
and flashy events with high intensity rainfall. Some assumptions have been made on the size of cross
drainage structures downstream of CX3770, CX3960, CX4200 in the rail corridor as this information is
not embedded into the DSS digital utility information on the drainage features within the corridor.
3.5 Geology and soils
The area is characterised by the crest along which the GWH runs in a north south direction, with the
steep escarpments on either side of Medlow Bath, with geological mapping indicating rocks and residual
soils of the Narrabeen sedimentary group. A search of the NSW Department of Planning, Industry and
Environment eSPADE website (undertaken on 27 November 2020), and the 1:100,000 Geology of
Penrith Map (Geological Survey of NSW, 1991), identifies the regional geology of the Study area as
Medlow Bath (residual), characterised by a combination of Warragamba (colluvial), Hassans Walls
(colluvial) and Wollangambe (erosional) landscapes adjacent to the study area.
There are no known sites or risk of acid sulphate soils occurring in the vicinity of the study area based
on a search of the Department of Planning, Industry and Environment’s database on Eastern Australian
Acid Sulphate Soils (undertaken on 26 November 2020).
Refer the Medlow Bath Stage 1 Contamination Report for further details.
419899 | 02 | B | May 2021Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 14 Surface and Groundwater Impact Assessments 3.6 Groundwater recharge Through inspection of typical landscape characteristics of the area through The Department of Planning, Industry and Environment eSPADE website, the sandstone escarpment is associated with moderately to steeply inclined colluvial slopes and drainage lines. Without the presence of contaminated land parcels on the NSW EPA contaminated land record (undertaken on the 8 December 2020 for records within the Blue Mountains City Council) within the vicinity of the study area, the general groundwater quality is considered high. 3.7 Registered groundwater users A review of local registered bores near the proposal area was conducted on 25th February 2021 using both: ● NSW groundwater map (WaterNSW), and; ● Australian Groundwater Explorer (Bureau of Meteorology) Two bores within the township of Medlow Bath were identified, both for the purpose of water supply. The location of these is indicated in Figure 3.5 with the key data summarised in Table 3.2. No monitoring data is available for the bores, with depths ranging from 46.8m up to 96.0m. Figure 3.5: Registered bores near Medlow Bath Source: Australian Groundwater Explorer (BOM, 2021) and Open Topo Map 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 15 Surface and Groundwater Impact Assessments Table 3.2: Registered bore data Bore ID Purpose Bore Depth (m) Elevation (m AHD) Salinity Status GW061451 Water Supply 46.8 1053.59 Unknown Unknown GW115835 Water Supply 96 Unknown Unknown Unknown Source: Australian Groundwater Explorer (BOM, 2021) The desktop review has returned no groundwater quality data and based on the location and type of bores in the area groundwater use is limited and the primary beneficial use of groundwater in the vicinity of the site would be environmental (ie providing base flow to waterways). 3.8 Groundwater dependent ecosystems Review of potential Groundwater Dependent Ecosystems (GDE) was performed using the Australian Groundwater Explorer tool (BOM, 2021), identifying the locations of GDE in the two receiving catchments. The mapped GDEs included “aquatic” ecosystems that rely on the surface expression of groundwater, and “terrestrial” ecosystems that rely on the subsurface presence of groundwater. No moderate and high potential GDEs were located in and surrounding the proposal area, and given the distance from the proposal it is not expected that there would be an impact. Figure 3.6 and Figure 3.7 indicate the high priority groundwater dependent ecosystems in the receiving Grose/Nepean River catchment and Coxs River Catchment respectively. To the west of the proposal area moderate potential and high potential GDE are located in the valley of the Cox River catchment. A search for the wider local government area reveals Commonwealth listed threatened species are likely or known to live in the area. For a full listing of the species refer to Appendix D protected matters report. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 16 Surface and Groundwater Impact Assessments Figure 3.6: Sydney Basin Blue Mountains, Grose River Source: Appendix 2 - Water Sharing Plan for the Greater Metropolitan Region Groundwater Sources 2011 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 17 Surface and Groundwater Impact Assessments Figure 3.7: Sydney Basin Blue Mountains, Coxs River Source: Appendix 2 - Water Sharing Plan for the Greater Metropolitan Region Groundwater Sources 2011 3.9 Contaminated sites As described in the Medlow Bath Phase 1 Preliminary Contamination Assessment Report no sites within the study area are identified as contaminated through Council and EPA held records. However, the report highlights the likelihood of localised contamination from the petrol station and fill material adjacent to the rail corridor. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 18 Surface and Groundwater Impact Assessments 3.10 Water quality Water draining from the subject area via the Grose River and Coxs river catchments are subject to controls under the Sydney Drinking Water Catchment. The requirements of the State Environmental Planning Policy (Sydney Drinking Water Catchment) 2011 for proposals within drinking water catchments is that an assessment must be carried out to the NorBE guidelines for demonstration of a neutral or beneficial effect on water quality. Refer section 4.3.3 for the potential impacts of the project on water quality, section 5.2 for the mitigation of impacts, and Appendix C for NorBE assessment summary. Runoff from the study area under existing conditions is directly from the cross drainage structures through Rail cross drainage culverts to the receiving drainage network in local roads and surface flows within the road corridor. Minimal existing treatment measures are installed to the urban runoff system prior to discharge to the natural receiving watercourses. 419899 | 02 | B | May 2021
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Surface and Groundwater Impact Assessments
4 Potential impacts
The sections below describe the potential impacts of the proposed GWH upgrade, including a
description of construction and operational impacts. The potential impact of future development and
climate change inform the operational impacts of the upgrade proposal.
4.1 Concept design
The proposal includes widening of the road from south of Bellevue Crescent to north of the Medlow
Bath Station at the intersection of the Great Western Highway with Station Street and Railway Parade.
This widening increases the area of road pavement including formalisation of the existing verge area to
new road pavement and verge profile, and additional cut/fill to enable widening of the road corridor.
Significant change to the road vertical geometry is not proposed due to the multiple interfaces along the
corridor at existing properties, driveways and roads.
4.1.1 Drainage design
The design includes provision for capture of surface runoff from the road corridor and conveyance in a
pit and pipe network. This is a significant upgrade on the existing conditions where minimal piped
infrastructure exists. The existing cross drainage discharge locations across the rail corridor are to be
maintained to continue the connectivity of flow paths to the downstream receiving watercourses. These
discharge locations are typically open drains leading to the rail corridor or existing overland flow paths in
Medlow Park. Table 4.1 below summaries the new and retained cross drainage structures for the Great
Western highway upgrade. The TfNSW design criteria for blockage of cross drainage structures has not
been considered in the capacity assessment below, but will form part of the design criteria for the cross
drainage structures in Detailed Design. Refer section 5.2 for discussion of the mitigation measures
associated with the cross drainage system.
Table 4.1: Drainage Standard of Design Drainage Structures
Cross Chainage Drainage structure Approximate Comments
drainage Standard
CD3370 3370 1 x 600mm RCP 1% AEP with Discharges to new basin.
Climate Change Refer to mitigation measures identified in
section 5.2
RD3770* 3770 1 x 450mm RCP 1% AEP Existing GWH cross drainage removed. Pipe
connection to rail and headwall connection to remaining rail
drainage cross drainage pipe.
RD3960* 3960 1 x 450mm RCP 10% AEP Existing GWH cross drainage removed. Pipe
connection to rail and headwall connection to remaining rail
drainage cross drainage pipe.
RD4200* 4200 1 x 450mm RCP 20% AEP Existing GWH cross drainage removed. Pipe
connection to rail and headwall connection to remaining rail
drainage cross drainage pipe.
CD4220 4220 1 x 600mm RCP 1% AEP with Discharges to new basin via upsized rail cross
Climate Change drainage
Refer to mitigation measures identified in
section 5.2
*Note the RD drainage series are lateral connections from the pipe drainage network to the rail cross drainage. Refer section 5.2.
419899 | 02 | B | May 2021Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 20 Surface and Groundwater Impact Assessments 4.2 Construction impacts During construction activities there are areas of vegetation being cleared, demolition of existing pavements and in-ground structures, trenching and general excavation and fill to achieve the desired road grading and verge profiles. These activities have the potential to cause the following impacts: ● areas of disturbed ground raises the potential for sediment transport, particularly during periods of wet weather with overland flows carrying the sediment. ● vehicle movements including temporary access and through traffic diversions in the area also creates disturbances to sediment increasing the risk of sediment transport either immediately through vehicle movements or subsequently through wind and water runoff. ● blockages in the waterways and drainage lines temporarily due to earthworks and other construction activities. Blocking or diversion of local drainage lines may result in localised flooding upstream of the safety works and may change the ultimate discharge location of overland flows into the receiving watercourses. ● diversion of drainage lines may create localised areas of flooding and scour. These temporary impacts are expected to be minor and would be managed through the implementation of standard construction techniques. ● drawdown of groundwater levels to surrounding landuses including affects to groundwater use and settlement of adjacent structures ● pollution of groundwater due to leaching of contaminants ● changes to the groundwater movement and resources, resulting in changed conditions for groundwater dependent ecosystems 4.3 Operational impacts This section identifies areas where there is a major change to existing impervious areas or change in horizontal/vertical alignment which would result in changes to upstream flood levels or downstream peak flow rates affecting properties, or related environmental impacts. It also identifies future upgrade considerations due to the potential impact on peak flows of future development and climate change. 4.3.1 Surface water impacts Upstream impacts are caused by increased runoff volumes by the increase in impervious portions of catchments, the increase in catchment size through regrading of the area to create the design pavement profiles, or the redistribution of flows as a result of a change in the formal drainage infrastructure. All three components are influencing the post construction flood impacts however the impacts are generally considered minor, with a limitation of vertical alignment changes, maintenance of flow discharge splits to downstream receivers, and general increase in available stormwater storage within the drainage system. Downstream flooding impacts are to be limited through the use of flow control structures at: ● a new detention basin downstream south of the existing cross drainage location (CX3480) where a major flow culvert upgrade across the transport corridor is proposed, ● a new detention basin downstream of the existing sag rail cross drainage location (CX4200 & CX4220) where a major flow culvert upgrade across the transport corridor is proposed, and; ● existing intermediate rail cross drainage locations (CX3770 & CX3960) where the GWH stormwater system discharges flows to the existing rail cross drainage structures without major flow culvert upgrades 4.3.2 Scour Scour potential is increased with higher velocities and larger flow rates than experienced under existing conditions. With the increase in impervious areas as the road widening is constructed, runoff volumes 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 21 Surface and Groundwater Impact Assessments will increase having the potential for scour events in receiving watercourses. Mitigation for this increase in flow rates is proposed at the discharge location to manage potential increases in velocity and peak flow. 4.3.3 Water quality The water quality impacts are partly addressed by this assessment in terms of water quality treatment. The runoff from urban portions of the catchment contribute pollutants in the form of gross pollutants, dissolved solid materials and suspended sediments including organic compounds and oils. Mitigation of the increases in pollutant loadings at discharge locations as a result of larger impervious surfaces within the contributing catchments is discussed in section 5.2. The NorBE assessment carried out for the project, including MUSIC modelling is the quantitative approach to assess the potential impacts and provide a basis of pollutant generation that is used in determination of the mitigation measures. A separate assessment of the quantity of discharge flows is detailed in the Hydrology and Hydraulics Assessment. 4.3.4 Groundwater All the construction stage potential impacts are relevant in the operational phase including groundwater level drawdown and changes to the access of contaminants to the groundwater. In addition the potential long term affects of the changes in impervious surfaces with road widening could alter the recharge rates in the immediate vicinity and continue the impacts to sensitive receivers such as groundwater dependent ecosystems. 4.4 Climate change The climate change uplift in rainfall intensities as a result of temperature increases under the latest climate projections incorporated into the guidance for stormwater and flooding practitioners, Australian Rainfall and Runoff 2019 (ARR2019), is to be incorporated into design infrastructure. The recommendations for rainfall uplift at the proposed upgrade is 19.7% on the ARR2019 rainfall data for the year 2090. These recommendations are based on a Representative Concentration Pathway (RCP) of 8.5 and provided through the ARR2019 datahub. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 22 Surface and Groundwater Impact Assessments 5 Mitigation measures During design development, the selection of geometrical alignment of the proposed road pavement has mitigated against significant groundwater impacts. By matching the vertical profile of the design to the existing GWH corridor the likelihood of groundwater drawdown from the construction earthworks interception of the groundwater tables is significantly reduced. 5.1 Construction measures Construction mitigation measures are comprised of the following items including a range of standard construction techniques previously used on similar projects and recommended by the literature: ● Sediment basins – for the collection of runoff sediment through reduction of velocity of runoff flows. Sedimentation basins are to be maintained through emptying of sediment build-up after each rainfall event causing the transportation of material from the construction footprint. ● Flow diversion bunds and catch drains– redirection of overland flows to dedicated management areas including sediment basins and ultimately to discharge locations, to be implemented in the initial stages of construction for discharge quality management and flood risk management. ● Sediment fencing – implemented in a similar approach as for flow diversion bunds but for use in areas only experiencing minor upstream contributing catchments. ● Check dams – velocity managing devices for installation into flow paths particularly in areas with steep gradients. ● Level Spreader – at all discharge locations to the natural surface, level spreaders should be used to reduce velocity and depth of the flows reaching the natural watercourses. ● Exclusion zones for fill placement - limits the exposure of stockpiles from the risk of washing into overland flow paths ● Stabilised construction entry – removes a large portion of sediment from vehicles prior exit from the construction areas to public roads. Assists in containing sediments These measures are to be implemented in accordance with the ‘Blue Book’ guidelines or Managing Urban Stormwater – Soils and Construction Volume 1 (Landcom 2004). ● During construction, monitor groundwater levels where potential impacts in the form of damage to buildings from settlement, is possible as a result of shallow groundwater conditions prior construction. If lowering of the water table is identified, then further mitigation measures will be implemented. ● Store potential contaminants in specific bunded enclosures to prevent the possibility of groundwater contamination in the event of spills from stored construction materials 5.2 Operational measures The following list of measures indicates a baseline methodology for mitigating the increases in runoff volume, pollutant loads and peak flow as a result of the proposed upgrade. ● Water quality (Biofiltration) basins - embedded biofiltration inside water quantity management basins provide water quality improvements of the discharge runoff from the permanent stormwater system. A basin including minimum 160m² of bioretention area is proposed for the Medlow Park basin downstream of CD4420. ● Accidental spill containment – dedicated diversion equipment for the storage of spills to avoid direct discharge to receiving watercourses. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 23
Surface and Groundwater Impact Assessments
● Grassed swales – vegetated flow carrying infrastructure providing filtration of stormwater flows
during low flow storm events through soil infiltration
● Level Spreader - at all discharge locations to the natural surface, level spreaders should be used to
reduce velocity and depth of the flows reaching the natural watercourses.
Table 5.1: Mitigation Measures
Impact Environmental Safeguard Responsibility Timing
Increase in peak flow Develop storage basins at the two locations identified,: CD3370 and TfNSW Concept
CD4420 Design
Increase in pollutant Design for biofiltration basins and grassed swales for primary and TfNSW Concept
loads from larger secondary treatment of the urban runoff prior to discharge. Design Design
impervious surfaces standard of the water quality improvement is to the NorBE guidelines
Scour potential Develop culvert/channel scour protection to the TfNSW standard TfNSW Detailed
increases at discharge details ensuring suitability for velocity and peak flow protection Design
locations
At the discharge of the drainage system downstream of CD3370, a new cross drainage culvert
proposed as part of the concept design, a new detention basin is required to attenuate the peak flows to
downstream and limit the discharge velocity. The position and shape of the basin is subject to the batter
design of the upgrade works. The size of biofiltration bed within the basin is anticipated to be 2% of the
contributing catchment area.
Figure 5.1: CD3370 Discharge Mitigation
Source: Medlow Bath Concept Design
At the discharge of the drainage system downstream of CD4420, a new cross drainage culvert is
proposed as part of the concept design, a new detention basin is required to attenuate the peak flows to
downstream and limit the discharge velocity. The position and shape of the basin is subject to
coordination with the Medlow Park masterplan as well as consultation with Council and any applicable
government agencies. The details of the discharge control structure of the basin based on culvert
419899 | 02 | B | May 2021Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 24 Surface and Groundwater Impact Assessments capacity once the blockage assessment of the GWH cross drainage design in confirmed in detailed design. The size of biofiltration bed within the basin is anticipated to be 2% of the contributing catchment area, and not less than 160m² to achieve the NorBE objectives for a beneficial outcome. Figure 5.2: CD4220 Discharge Mitigation Source: Medlow Bath Concept Design To mitigate the potential impacts on groundwater during the operational phase, ● swales are to be vegetated where possible to maintain groundwater recharge rates. ● bioretention areas are to be unlined, encouraging groundwater recharge after treatment of the surface runoff which removes much of the pollutants ● spill containment measures and pollutant traps are to be inspected regularly as part of the maintenance program to ensure they remain functional and the adequacy of storage volumes for subsequent potential contaminants is maintained. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 25 Surface and Groundwater Impact Assessments 6 Recommendations These recommendations are based on the principles of not worsening the existing conditions for runoff and ground water quality. The recommendations in this report will contribute to achieving a beneficial outcome with regard to surface water quality as indicated by the NorBE assessment, and a negligible impact on groundwater due to the design alignment selection, no active use of groundwater; and the proximity of the site in relation to the location of the existing bores: ● Provide all runoff discharge locations with level spreaders for limits on the scour potential of runoff entering the existing watercourses ● Runoff discharge locations are proposed to have attenuation basins for mitigation of the discharge peak flows to no greater than under the existing conditions. Bioretention is proposed to be integrated into the basin floor to provide stormwater quality filtration and treatment. Minimum bioretention area is to be 160m², with a recommended 2% of catchment area to be provided to achieve a beneficial outcome. ● Scour protection to all overland flow routes comprising grass cover by default, and concrete lining channels for velocities greater than 2m/s. ● Consult with Council around the integration of attenuating basin to the Medlow Park masterplan area. The dimensions and depth to be developed in consultation with Council engineers to ensure safe operation of the infrastructure. ● Consult with the owner of groundwater bore near the boundary of the proposal area to understand the access and GW061451 quality requirements of the bore into the future and confirm no adverse impacts. ● During construction, monitor groundwater levels where potential impact in the form of damage to buildings from settlement, is possible as a result of shallow groundwater conditions prior construction. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 26 Surface and Groundwater Impact Assessments 7 References Australian Government 2013, Guidelines for groundwater quality protection in Australia: National Water Quality Management Strategy, Department of Agriculture and Water Resources, Canberra. Ball J, Babister M, Nathan R, Weeks W, Weinmann E, Retallick M, Testoni I, (Editors), 2019, Australian Rainfall and Runoff: A Guide to Flood Estimation, Commonwealth of Australia NSW Department of Infrastructure, Planning and Natural Resources, 2005, Floodplain Development Manual: the management of flood liable land, NSW Government, Sydney. NSW Department of Primary Industries, 2012, NSW Aquifer Interference Policy: NSW Government policy for the licensing and assessment of aquifer interference activities. 419899 | 02 | B | May 2021
Mott MacDonald | Great Western Highway Upgrade - Medlow Bath 27 Surface and Groundwater Impact Assessments A. Catchment Mapping 419899 | 02 | B | May 2021
Medlow Bath
Review of Environmental
Factors
Hydrological Catchment
Layout Map
Legend
Spatial Data
REF Assessment Catchments
Study Area
OpenTopoMapMott MacDonald | Great Western Highway Upgrade - Medlow Bath 28 Surface and Groundwater Impact Assessments B. Drainage Concept Design 419899 | 02 | B | May 2021
Notes
LEGEND
NEW DRIVEWAYS AND
EXISTING DP PROPERTY BOUNDARY
NEW TWO CARPORTS TO BE PROVIDED
NEW DESIGN
DRIVEWAY WIDTH TO ALLOW FOR
TURN OF 8.8m SU TRUCK VEHICLE SHARED VEHICLE/ DESIGN CONTROL LINE
EP
PEDESTRIAN/ CYCLIST ZONE
FROM KATOOMBA DRIVEWAY WIDTHS TO BE
EXISTING HERITAGE WALL TO
BE PROTECTED
EXISTING ACCESS TO STATION STREET TO BLACKHEATH EXISTING SURVEY
ADJUSTED WHEN SURVEY TO BE MAINTAINED
AVAILABLE
UNITED PETROL RAILWAY CORRIDOR
EXTENT OF SHARED PATH AND KERB
HYDRO MAJESTIC
1 000
TYP.
OPENINGS THROUGH THE MEDIAN FOR
MIN.
150
STATION FLOOD RISK MITIGATION
MAZDA
TO BE CONFIRMED
EXISTING PAVEMENT
HOTEL DEMOLISH EXISTING RETAINING WALL
DEALERSHIP
E
?PP
LOCALLY NARROW CLEARANCE AT EXISTING DRIVEWAY TO AND RECONSTRUCT NEW RETAINING
SHARED PATH, W= 0.5 m BE REMOVED WALL. EXTENT TO BE CONFIRMED ENVIRONMENTAL STUDY BOUNDARY
PC 4143.097
PT 4234.955
PROPERTY ACQUISITION LINE
4160
4180
4140
4120
4200
BUS SHELTER LOCATION
4100
LOCALLY NARROW CLEARANCE AT
PT 3897.878
4080
4220
4060
4040
4020
4000
TO BE CONFIRMED.
4240
3980
SHARED PATH, W= 0.5 m
PC 4295.183
3960
3940
3920
4260
3900
RETAINING WALL
PC 4368.311
PT 4405.919
PT 4348.022
PC 3836.621
3880
TS 4474.698
4280
3860
SHARED PATH DISCONTINUED
4300
SC 4514.698
4380
4400
3840
4320
4360
4420
4340
4440
AT BUS STOP LOCATION
4460
4480
MAINTAIN EXISTING TRACK NEW ROAD CONFIGURATION TO POTENTIAL CONSTRUCTION
4500
3820
CAPACITY OF THE CURRENT RIGHT
EP
EP
EP
EP
ACCOMMODATE TURNING AREA AND
?P
EP
3800
4520
TURN LANE TO BE CONFIRMED DUE TO
EP
COMPOUND SITE
WH
CONSTRUCT RETAINING PROPERTY ACCESS WILL INCREASE
235U
EP
WH
3780
EXPECTED INCREASE IN TRAFFIC FOR
TJP
IN
EEPP
IN
?G
EP
WH
WH
EJ B
GAATT
WH
WH
EJBEP
IMPACT TO UTILITIES
EP
105
WALL FROM APPROX.
105
3760
U-TURN PURPOSES
WH
WH
?P
WH
4540
EP
?P.575
2
?EPP
WH
WH
2.61
IN
235U
BUS
IN
CH 3575 TO CH 3710.
IN
?P
IN
3740
EP
WH
?P
0
EXISTING HERITAGE WALL
105
105
EP
?EPP
WH
?EPP
105
105
?P
105100510E E
WH 1051.8
2.12
3720
2.21
PHPOHO
11010 LELEE
EP
2.24
110055121LEE
235U
2 .3 6
101409489ELE
PPHPHOHO
GAT
WH
PPHHOO
PHPOHO
110015510320.59OE2L.89E4762
1055105E LE
1049 E
5
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PT 3671.040
1057 E
PPHH1POPO0HH5L2OELEE
3
5
BUS
PHOPHO
ZONE
PHO
7
3700
PHO
7
0
57
1055 E
1057 LE
.5962.84023207
TIE INTO EXISTING GREAT WESTERN
PHO
1051.48E6
1P0H51O E
P57.47.H23.O347925
L L
PHO
..834845168
PHO
456
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LO
NEW DRAINAGE DESIGN
L
5.0304.04
.2056.267184
L
235U
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3680
L.
L
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PHO
L
HIGHWAY ALIGNMENT
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0
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L
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L
11005544LLEE 2
L
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32
3660
PPHHOOS 4577.0
627
LE
037
235U
96
248
C
0.2
001
NEW DRAINAGE PITS
.66
627
59
..132059
7E
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627
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9.5
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627
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458
247
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THROUGH LIFT
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627
60
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0
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OHWS SL115+770
EP
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RW
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OHWS SL115+757
4E 180
EP
1051 LE
E
127
1051 E
N
3600
GAT
PHO
OHWS SL115+709
ST
233
PHO
OHWS SL115+796
5+757
OHWS SL115+831
ONE WAY LIFT
230
190
E
127
70
627
0N
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4
E?PP
EP
228
021
594 459
?P
235U
.828
233
PC 35
248
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1.7
084
OHWS SL11
L
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4E
78
GAT
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?P
12
N
627
RW
3580
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TJP
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2
207
WH
73.77
TJP
248
233
2.1
105
235U
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GAT
3E
58
12
WH
>
ELECTRICAL HIGH VOLTAGE - ABOVE
627
N
233
E
>
013
2
130
RW
1054 LE
248 CHANNEL CHANNEL E
127
PHO
233
2.5
207U
126
203U
IRON
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37
207
244
2E
12
3560
115+940
CHANNEL IRON
N
GROUND
0N
CHANNEL
10512 E
IRON
EXISTING BUS
PHO
OB
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235U
233
RW 4
207U
203U
SHELTER STRUCTURE EXISTING VERTICAL ALIGNMENT
105
12
OHWS SL
TRACK - UP DOWN
207
235U
WH
L
6.59
RST
233
120
3540
TO BE REMOVED PROPOSED PEDESTRIAN E
IMMEDIATELY NORTH OF STATION
233
235U
127
WHWH
6
248
207U
203U
BUS SHELTER LOCATION
0N
233
OVERBRIDGE
4
235U
STREET MAY NOT COMPLY WITH 70 Kph
110
TRACK - UP MAIN
207
E
127
80
GAT
4
233
GAT
251
TO BE CONFIRMED 220
132
235U
220
132 220
132 220
132 220
132 220
132 220
132 220
132
CONSTRUCT DEFLECTION WALL.
0N
DESIGN SPEED.
233
3520
CONSTRUCT RETAINING WALL.
207U
100
203U
E
127
428
2
235U
28 211 28 211 28 211 28 211 28 21128 211
28 28
211 211
28 28
211 211
28 211
28 28211 28211 28 211 28 211 28 211 28 211 28 211 28 211 28 211 28
>
211 28 21128 28
211 28
211
PEDESTRIAN ACCESS TO BE
6+03
254
211 28 211 28 28
211 28
211
>
28 211 28 28211 28 211
233
28 211
28 211
EXTENT TO BE CONFIRMED.
>
21128 28
211
211 28 211 28
E 21128
EXTENT TO BE DETERMINED.
>
28 211
28 211
28
0N
28 211 28 211 28 211 28 211 21128 28
211 28
211
>
E
28211 28
211
PT 34
28
28 211
E 28
211 113
235U
28 211 28 211 28 211 28 211 28 211 28 211 28 211 28 28 211 28 211
>
>
28 211 28 211 113
207
28
28 211
E 211 28 113
28
>
122
28 211 28 211 21128 113
SL11
185
>
REMOVE EXISTING PEDESTRIAN
113
>
3 MEDLOW BATH
28
211 211
E
28 113
CLOSED OFF AND APPROACHING
>
28
211
207U
E
203U
211 113
>
28
211
>
28
>
4 21128
E E 211
28 4 28 MEDLOW BATH STAT MEDLOW BATH STAT
>
>
627
28
211
ION
>
211
28 4 28 ION
E
4 21128 28
>
21128 28
235U
>
4
RST
211 28
E
4
>
28
233
E
3500
SIGNILISED INTERSECTION
28
003
211 28
>
211
28
11
28
>
9
4
223
211 28 E 28
>
E
248
58
21128
RST
RAIL LEVEL CROSSING AND
S
28
>
28 28
4
PATH TO BE REMOVED.
3.6
188 211 211
28 28
>
4.874
>
28 211 28
OHW
28
4
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4B
>
>
FL
235U
2E
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28 28 211
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0.
6+05
>
28 211 28 211
1051 LE
>
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28
28
>
28 211 211
AT BELLEVUE CRES
4 28
627
PHO
207U
203U
>
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28
ASSOCIATED HIGHWAY CROSSING
STATION
211
28
105
050
>
233
28
211 4 211
28
12
247
SL11
80U
4
28
4
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>
CONSTRUCT RETAINING
211
OHWS SL115+493
4 12
9.9
>
978
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>
28
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RST
4 E .95 28
211 233
2.53
>
28 E 4 21128 B 120
N
211
>
4
.626956
28
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211 211
28 0.4 E
3480
235U
28
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1049 LE
211
28
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OHWS SL115+431
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>
>
S
211
PHO
WALL FROM APPROX.
28
>
28
8
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211
OHWS SL115+545
28
RST
211 MEDLOW BATH STAT
233
28
OHW
>
28 211
6
21
28 211 281 ION PLATFORM
80U
28211
6+07
>
OHWS SL115+573
28
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28
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28
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21128
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>
28
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21128 2218
CH3690 TO CH4420.
WH
211 28
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1
>
OHWS SL115+370
211 28
>
E 28
SL11
28 211
E
28 211
>
233
233
28 211
NEW STORMWATER PIPE IN ADDITION TO 233 090
OHWS SL115+594
28211 22181 230 E
80U
211
28
3460
EXISTING PEDESTRIAN OVERBRIDGE
127
>
>
28
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28
127
211 28 21128 28
211 28
211 211
211 28
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260
>
228
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OHWS SL115+632
28
227
28 211
OHW
12
28 211
AND PARALLEL WITH THE EXISTING CROSS
627
0N
>
>
211
>
28
RST
0N
28
211
TO BE MAINTAINED.
025
28
211
>
28 28
211
E
21128 211 248 28 211
28 211
2.1
211 28 104
80U
28 28 0
.01 211 80 .80 1.2
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211
DRAINAGE 28
74
28 2E 211 0. 0
RST
28 211 28 211 28 0 1.2 0
>
28 211 E 1.2
N
211
28 0 00 0 40
1.
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211 28 28
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115+963
E 28 21
127
234
3400
28211 233
626
246
0N
220
233
E 233
991
CATCHMENT DRAINAGE TO CULVERT
0N
211 28 170
OHWS SL
>
>
248 E
211 28
5.2
I
270
?P
N
OHWS SL115+887
.63 28
OHWS SL115+892
4E 211
07
127
375 55.336
28
115+986
OHWS SL
>
>
211
N
28
BENEATH RAIL.
243
10
233
28 211 233
Dia
0N
190
28211 E
627
E
211
28
011
28
211
E 248
3380
28
211
OHWS SL
3.6
28 186
211
233
.74
121
21128 2E
96
116+009
211 28
>
>
N
PC 3
28
L115+
GAT
28 211
127
211
>
28
>
28 211
233
253
TIE INTO EXISTING GREAT WESTERN 28 211 233
127
OHWS SL
3603.5360
0N
RAISED THRESHOLD
150
28211
SS
E
251
211 28
E 233
0N
HIGHWAY ALIGNMENT E 160
OHW
211 28 E
ININ
211 28 207 207 207
207
05
GAT
28 207
337755 5554.2.74054
211 207 207
EP
28 207
>
71
>
282021
1100
626
1055 LE
7
20211
DDiaia
28
PHO
985
248
211
207
28
>
5.9
311
>
.80 2171
28 20
WH
5E
71
2171
057
2820
N
.464
207
21
28 1
E
1058 LE
2817
3340
21
20
PHO
L115+
E2817
21
627
20
?EPP
2028
17
21
SECTION OF EXISTING OVERHEAD 11KV
005
201728
21 248
4.4
227
201728
>
21 .91
SS
.3P1H2O PH
>
105 LE105 LE GAT
GAT
3E
6N
2171
20
28
TO BE RELOCATED UNDERGROUND TO
627
2171
28
20
OHW
>
001
>
211
207
28
281 248
8.14027 6.59
21
207
PT 3
4.8
248
128 .69
127
207
21
CLEAR PROPOSED PEDESTRIAN
3
2E
NEW FORMALISED PARKING
39
217
3320
20 128
6+10
E
259
N
233
E?P
E
0N
140
626
311.0
207
1056 LE
RAISED PEDESTRIAN
5 1
E
P
207
OVERBRIDGE. PLANNED SURVEY WORKS
PHO WH
REPLACING EXISTING ON-STREET PARKING
983
SL11
248 211
28
11 PPHHOLOEEL
207
6.3
332
>
PPHHOO
O
.19 2218
WATER QUALITY TREATMENT BASIN TO
>
7E 2017
28
21 1
54
100140409494.9.5540L83EE
281
CROSSING
99
3
GAT
207
21
AT THE HYDRO MAJESTIC HOTEL WILL DETERMINE INTERFACE BETWEEN
N
S
.437
14+99
>
2017
OHW
21
28
>
TREAT RUNOFF FROM THE PROPOSED NEW KISS AND RIDE
PC 3
L
2817
CAFE
3300
20
9.7.7977
21
PROPOSED FOOTPATH AND EXISTING
S SL1
28
20
21 17
E ROAD ALIGNMENT. PRELIMINARY
127
PARKING (x2)
28
11
220 7
28
E POLES FOR LENGTH OF RAILWAY PARADE.
261
2
233
8.864
OHW
2171 28
0N
140
20
BIORETENTION AREA = 530 m²
E
28
>
2171
20
3285
>
28
2171
20
28
626
2171
20
>
28
995
>
2171
28 20 248
5.6
289
2171
28 20 .86
3E
03
217
2820
1
N
E
626
2017
E 2817
28
21
977
21
20
248 17
2028
21
7.1
373
.36
7E 20128
21 7
>
18
201728
21
>
27.60
N
211
207
28
25.50
211
207
28
27.60
>
211
207
28
>
28
211
207
9
7
2028
211
14+92
1 0055788.L114E1448
211
28 207
11P00HH5O7.LE
E
2171
28 20
var. (6.7 - 9.2)
PPHHOOLE
2171
var. 2.50 1.50 3.35 3.35 1.80 3.30 3.35 3.35 2.50 0.60
2820
E 2171
4.50 1.50 3.35 3.35 1.80 3.30 3.35 3.35 2.50 0.60
S SL1
20
28
8.44093
281
21
20 7
17
287
211
20
4.50 1.50 3.35 3.35 5.10 3.35 3.35 2.50 0.60 4.50 3.30 3.35 3.35 1.20 3.35 3.35 2.50 0.60
>
2028
21
>
128
OHW
207
21
201728
BARRIER & WALL
21
BARRIER & WALL
SHOULDER
THROUGH THROUGH RIGHT THROUGH THROUGH
RAISED MEDIAN
2017 28
SHOULDER
SHOULDER
VERGE
THROUGH THROUGH RIGHT THROUGH THROUGH
21
RAISED MEDIAN
>
WH
LANDSCAPING SHARED ZONE
>
RAISED MEDIAN
1.00 2.50 1.00
2871
20
21
LEFT TURN THROUGH THROUGH THROUGH THROUGH
BARRIER & WALL
SHOULDER
THROUGH THROUGH RAISED MEDIAN THROUGH THROUGH
BARRIER & WALL
SHOULDER
2871
SHOULDER
20
21
21 1
2028
7
626
201
21 728
E LANE N/B LANE N/B TURN LANE S/B LANE S/B 1.00 2.50 1.00 LANE N/B LANE N/B TURN LANE S/B LANE S/B
971
248 E 1.00 2.50 1.00 LANE AT LANE S/B LANE S/B
7.8
LANE N/B LANE N/B
414 207
LANE N/B LANE N/B LANE S/B LANE S/B
1
218
SHOULDER
.53
VERGE
207
81
VERGE
8E
207
SHARED
N
>
18
LANE S/B LANE S/B
>
207
WH
212
VERGE
VERGE
207
SHARED
5
28 211
STATION ST
14+86
28 211 28 211 28
>
VERGE
VERGE
1
SHARED
217
PATH N/B
2820
>
217
20
28 1
2871
PATH
S SL1
20
21
E
2028
21 17
28
20
21 17
E 0.50 0.50 PATH
OHW
28
2171
20
>
28
SHOULDER
SHOULDER
>
2171
20
28
2171
28 20
>
2171
>
28 20
28
221017
0.50 0.50
E E
21017
28
221017
28
0.50 0.50
1
28 2
14+80
>
SA GUTTER
>
11
28 2207
SA GUTTER
GUTTER
GUTTER
>
281
S SL1
21
>
207
28
211
211 28
(LOCAL
E
207
OHW
28
211
E 1
28 211
28 207
28 21
TRAFFIC
207
207
>
4
>
ONLY)
2% 3% 2% 3% 3% 2% 2% 3% 3%
LONG VEHICLE
LONG VEHICLE
3% LONG VEHICLE
LONG VEHICLE
3% LONG VEHICLE
3% LONG VEHICLE
LONG VEHICLE
5%
LONG VEHICLE
5%
SF KERB HIGH PERFORMANCE REDIRECTIVE SF KERB SF KERB
SA Kerb & Gutter SA Kerb & Gutter SA Kerb & Gutter SA Kerb & Gutter
KERB (HPRK) AT LANDSCAPED MEDIAN
1060.663
MEDLOW BATH MEDLOW BATH MEDLOW BATH MEDLOW BATH
TYPICAL CROSS SECTION - BELLEVUE CRESCENT TYPICAL CROSS SECTION - WIDE MEDIAN MID-BLOCK TYPICAL CROSS SECTION - RIGHT TURN LANE TYPICAL CROSS SECTION - NARROW MEDIAN
3713.458
INTERSECTION NORTHERN APPROACH CHAINAGE 4380
1058.451
CHAINAGE 4000 INTO HYDRO MAJESTIC PROPERTY
1057.885
CHAINAGE 3800 SCALE: NTS CHAINAGE 4060 SCALE: NTS
3424.689
SCALE NTS
1056.571
SCALE: NTS
4553.295
1056.295
1055.977
1055.745
1055.639
1055.488
1055.126
3826.828
1054.836
4501.262
1054.598
1054.505
4490.852
1054.327
4480.442
3370.000
1054.086
3856.829
1053.771
3886.829
1053.528
4439.531
3930.498
1053.083
4424.645
1052.994
3952.868
1052.662
4409.760
1052.531
1052.453
3975.238
1052.124
3984.996
1051.800
4002.883
4020.770
4087.158
1051.001
4354.598
4128.877
1050.940
4340.150
WESTERN STAIRS FOOTPATH RAIL PLATFORM STAIRS EASTERN STAIRS
1050.382
4325.702
ROOF STAIRS
4170.597
4172.357
1049.373
DK NW
4262.394
09/02/2021 RE-ISSUE FOR CONCEPT DESIGN VS
18/12/2020 DK ISSUED FOR CONCEPT DESIGN NW VS
4217.376
Date Drawn Description Ch’k’d App’d
Status Stamp
DESIGN LEVEL MINIMUM CLEARANCE OF
CONCEPT DESIGN
7.2m NOM
RL 1059.900 6.1m AT THIS LOCATION
8.4m NOM
PLATFORM
RL 1045.000 WESTBOUND EASTBOUND DOWN UP
CARRIAGEWAY CARRIAGEWAY LINE LINE
VERTICAL P=5.14%
R=3300.000
L=288.769
P=-3.61%
R=2500.000
L=60.000
P=-1.21%
R=3500.000
L=44.739
P=-2.49%
R=1800.000
L=35.775
P=-0.50%
R=2800.000
L=83.439
P=-3.48%
R=1574.002
L=90.038
P=2.24%
R=5000.000
L=28.895
P=2.82%
R=5000.000
L=29.772
P=2.22%
R=2500.000
L=20.820
P=3.06%
KEEP EXISTING PROFILE
L=54.689 L=113.370 L=43.670 L=9.758 L=66.388 L=1.760 L=63.308 L=55.162 L=40.911 L=52.033
GEOMETRY K=33.000 K=25.000 K=35.000 K=18.000 K=28.000 K=15.740 K=50.000 K=50.000 K=25.000
Client
HORIZONTAL L=134.369 D=78.898 L=97.268 D=165.581 L=61.256 D=245.219 L=91.858 D=60.228 L=52.839 D=20.289 L=37.608 D=68.778
L=40.000 L=62.384 L=17.000
D=0.782
SPIRAL SPIRAL
GEOMETRY R=2711.400 R=700.000 R=700.000 R=1000.000 R=600.000 R=1200.000 R=180.000
3.00% 3.00% 3.00% 3.00%
BRIDGE ELEVATION PLAN
-1.20%
SUPERELEVATION
-2.89% -3.00% -3.00% -3.00% -3.00% SCALE: NTS
DESIGN
1057.181
1058.451
1060.831
1062.781
1061.921
1061.701
1061.121
1058.261
1056.571
1053.771
1051.001
1050.221
1052.141
1052.531
1053.811
1055.291
1055.639
1056.153
1058.210
1059.202
1060.077
1061.313
1061.463
1061.975
1062.365
1062.633
1062.715
1062.748
1062.807
1062.713
1062.497
1062.159
1060.663
1060.427
1059.705
1058.983
1057.539
1056.818
1056.237
1056.130
1055.668
1055.594
1055.218
1055.126
1054.992
1054.966
1054.725
1054.598
1054.470
1054.256
1054.116
1053.652
1053.528
1053.217
1053.172
1052.998
1052.994
1052.897
1052.797
1052.697
1052.662
1052.568
1052.305
1052.142
1051.899
1051.823
1051.350
1050.940
1050.693
1050.017
1050.003
1050.006
1050.039
1050.330
1050.382
1050.776
1051.116
1051.224
1051.672
1051.800
1052.145
1052.350
1052.683
1052.918
1053.247
1053.977
1054.086
1054.364
1054.483
1054.836
1054.846
1055.618
1055.736
1055.745
1055.999
1056.257
1056.295
1056.705
1056.868
1057.479
1057.885
KEEP EXISTING LEVELS
LEVELS
EXISTING
1058.751
1058.091
1054.501
1053.531
1052.911
1052.161
1054.571
1056.341
1056.821
1057.881
1058.051
1055.639
1056.145
1057.106
1058.082
1058.310
1059.023
1059.873
1060.586
1061.045
1061.188
1061.699
1062.144
1062.418
1062.515
1062.555
1062.595
1062.665
1062.597
1062.393
1062.062
1061.812
1061.570
1060.954
1060.497
1060.265
1059.494
1057.476
1056.900
1056.728
1056.479
1056.389
1055.978
1055.894
1055.444
1055.322
1055.138
1055.108
1054.790
1054.624
1054.308
1054.188
1053.947
1053.872
1053.783
1053.488
1053.222
1053.213
1053.039
1052.722
1052.630
1052.462
1052.180
1052.042
1051.840
1051.777
1051.404
1051.144
1051.102
1050.926
1050.528
1050.334
1050.314
1050.263
1050.277
1050.442
1050.470
1050.715
1051.030
1051.135
1051.488
1051.600
1051.948
1051.952
1052.340
1052.485
1052.714
1053.029
1053.560
1053.713
1053.812
1054.080
1054.213
1054.585
1055.090
1055.492
1055.645
1055.657
1055.973
1056.253
1056.994
1057.489
1058.353
1058.394
1058.558
1058.563
LEVELS GWHUP - MEDLOW BATH
GENERAL ARRANGEMENT PLAN &
3836.621
4368.311
4439.531
4000.000
4002.883
4020.000
4020.770
4040.000
4060.000
4080.000
4087.158
4100.000
4120.000
4128.877
4140.000
4143.097
4160.000
4170.597
4172.357
4180.000
4200.000
4217.376
4220.000
4234.955
4240.000
4260.000
4262.394
4280.000
4295.183
4300.000
4320.000
4325.702
4340.000
4340.150
4348.022
4354.598
4360.000
4380.000
4400.000
4405.919
4409.760
4420.000
4424.645
4440.000
4460.000
4474.698
4480.000
4480.442
4490.852
4500.000
4501.262
4514.698
4520.000
4540.000
4553.295
4560.000
4577.082
4580.000
4594.082
4594.864
3370.000
3380.000
3400.000
3420.000
3424.689
3440.000
3460.000
3480.000
3494.874
3500.000
3520.000
3540.000
3560.000
3569.074
3573.772
3580.000
3600.000
3620.000
3640.000
3660.000
3671.040
3680.000
3700.000
3713.458
3720.000
3740.000
3760.000
3780.000
3800.000
3820.000
3826.828
3840.000
3856.829
3860.000
3880.000
3886.829
3897.878
3900.000
3920.000
3930.498
3940.000
3952.868
3960.000
3975.238
3980.000
3984.996
STATION
ROAD LONGSECTION
LONGITUDINAL SECTION - MC001
Designed C.ARSENE MRB Eng check M.SCHOFIELD MRB
HW5 GREAT WESTERN HIGHWAY - MEDLOW BATH Drawn
Dwg check
D.KUMAR
N.WADE
MRB
MRB
Coordination
Approved V.SOFREVSKI MRB
LONGITUDINAL SECTION - MEDLOW BATH - CONTROL LINE MCM0 MMD Project Number
419899
Scale at A0
1:500
Security
HORIZ SCALE = 1:500 VERT SCALE = 1:100 0 25m 50m
Suitability Description
Work In Progress
Suit. Code
1:500
Drawing Number Revision
GWHEMB-MRBJ-MED-CV-SKE-101001 1You can also read
