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Karangahape Station Main Works Erosion and Sediment Control Plan

CRL-KRD-RME-LKA-PLN-800017

Revision: 000 Date: March 2020

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| Karangahape Station Main Works

Erosion and Sediment Control Plan

Karangahape Station Main Works - Erosion and Sediment Control Plan CRL-KRD-RME-LKA-PLN-800017

This document is uncontrolled when printed. This document should be printed in colour

Revision Status Revision

Date

Version details

Prepared By

Approved By

000

18/03/2020

Final for submission

Troy Brockbank Peter Roan & Rob Gordon

Approval Status Name/Title

Signature

Date

Prepared by:

Troy Brockbank Kaitohutohu Matua Taiao & Rob Gordon Principal Environmental Engineer

18/3/2020

Reviewed by:

Cameron Sunde Planner - Link Alliance

18/3/2020

Approved by:

Peter Roan Link Alliance â€“ Consents Manager

18/3/2020

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Table of contents 1. Introduction ............................................................................................. 5 1.1

Karangahape Station ..................................................................................................... 5

1.2

ESCP Staging ................................................................................................................. 6

1.3

Purpose of the ESCP ...................................................................................................... 6

1.4

Relevant Conditions ...................................................................................................... 6

1.5

Sustainability .............................................................................................................. 10

1.6

ESCP Review and updates ............................................................................................ 11

2. Karangahape Main Works ...................................................................... 12 2.1

Overview of Works ...................................................................................................... 12

2.2

Construction Support Areas ......................................................................................... 12

2.3

Active Construction Zones ........................................................................................... 13

2.4

Topography and Drainage ........................................................................................... 13

2.5

Construction Methodology .......................................................................................... 15

2.6

Earthworks ................................................................................................................. 16

3. Erosion and Sediment Control and Management ................................... 17 3.1

Key Principles .............................................................................................................. 17

3.2

Erosion and Sediment Control Measures ...................................................................... 17

3.2.1.

General ESC Measures .................................................................................................. 17

3.2.2.

Asphalt Works and Concrete Pumping / Pouring ......................................................... 19

3.2.3.

Erosion and Sediment Source Control .......................................................................... 19

3.3

Specific Erosion and Sediment Control Measures ......................................................... 20

3.3.1.

Mercury Lane ................................................................................................................ 20

3.3.2.

Beresford Square .......................................................................................................... 21

3.3.3.

Settlement Tank Sizing .................................................................................................. 23

3.3.4.

Water Treatment .......................................................................................................... 23

3.4

Other Considerations .................................................................................................. 24

3.4.1.

Contamination .............................................................................................................. 24

3.4.2.

Dust Control .................................................................................................................. 24

3.5

Monitoring During Construction .................................................................................. 24

3.6

Heavy Rainfall Response & Contingency Measures ....................................................... 25

3.7

Site Reinstatement ...................................................................................................... 26

4. Roles and Responsibilities, Training and Complaint Response ................ 27 4.1 Page 3

Roles and Responsibilities ........................................................................................... 27

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Erosion and Sediment Control Plan 4.2

Training ...................................................................................................................... 27

4.3

Complaints .................................................................................................................. 27

Appendix A: Record of CLG Comments ......................................................... 28 Appendix B: ISCA Requirements................................................................... 29 Appendix C: ESCP Drawings ......................................................................... 30 Appendix D: Flocculent Treatment Management Plan (FTMP) ..................... 31 List of Tables Table 1-1: Relevant ESCP Resource Consent conditions and location in the Plan.................................. 6 Table 2-1: Overview of Main Works Construction Activities ................................................................ 12 Table 2-2: Construction Activity, Approximate Earthworks Areas and Volumes ................................. 16 Table 3-1 General Erosion and Sediment Control Measures ................................................................ 18 Table 3-2 General source control measures applicable to the works area for elimination and/or minimisation of erosion and sediment generation .............................................................................. 19 Table 4-1: ESCP training requirements ......................................................................................... 27

List of Figures Figure 1-1: CRL Route and Location ........................................................................................................ 5 Figure 2-1: Overland Flow Paths and Flood Sensitive Areas in Beresford Square and Pitt Street (Source: Auckland Council Geomaps) ................................................................................................... 14 Figure 2-2: Overland Flow Paths and Flood Sensitive Areas in Mercury Lane (Source: Auckland Council Geomaps) ................................................................................................................................. 15

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Erosion and Sediment Control Plan

Introduction

The City Rail Link (CRL) project comprises the construction, operation and maintenance of a 3.4 km underground passenger railway, running between Britomart Station and the North Auckland Rail Line in the vicinity of Mt Eden Station. The CRL also involves the construction of two new underground stations at Aotea and Karangahape and a redeveloped Mt Eden station (refer to Figure 1-1). The design and construction of the CRL infrastructure between the Aotea and Mt Eden Stations is being delivered by the Link Alliance. This Erosion and Sediment Control Plan (ESCP) has been prepared in relation to the main construction works for the new Karangahape Station.

Figure 1-1: CRL Route and Location

1.1 Karangahape Station The Karangahape Station consists of two entrances, one at Beresford Square / Pitt Street and the other at Mercury Lane, linked together by platforms with two mined tunnels approximately 32m below Pitt Street. The Station will also comprise equipment rooms, ventilation systems and emergency egress at both Mercury Lane and Beresford Square / Pitt Street. Given the nature and scale of the Karangahape Station construction, works will be undertaken in a staged manner, involving: • • •

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Early works (demolition, network utility relocation and site establishment works) – to be undertaken from October 2019 through to early 2020; Main construction works (construction of the station and mined tunnels for the rail tracks) – to be undertaken from early 2020 through to late 2023; and Public realm reinstatement – likely to be undertaken from late 2022 to late 2024.

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Erosion and Sediment Control Plan

1.2 ESCP Staging To reflect the staged construction approach for the Karangahape Station, a series of ESCP are being prepared. This ESCP addresses the Karangahape Station main works (the main works), which are detailed in the Karangahape Station Main Works Construction Environmental Management Plan (CEMP) and summarised in Section 2 of this ESCP. ESCPs may also be prepared for the station superstructure and public realm reinstatement works if required.

1.3 Purpose of the ESCP This ESCP has been prepared to identify measures that will be implemented to mitigate and manage the potential adverse effects on the receiving environment from any erosion and sediment generation during the main works. This ESCP has been prepared in accordance with Conditions 53-58, 65-72, 145, 167-169 and 173-177 of the CRL Aotea to North Auckland Line (A2N) regional resource consents (land use consent R/LUC/2016/1890). This ESCP forms part of the CEMP for the main works (refer to designation Conditions 21.1 (b) and (c) and resource consent Condition 35) and should be read in conjunction with the CEMP and other relevant main works Delivery Work Plans (DWP) and Management Plans (MP). Chemical treatment is likely to be required to assist in the settlement of sediments during the main works. A Flocculant Treatment Management Plan (FTMP) is included in Appendix D of this ESCP. This ESCP was developed in consultation with the Karangahape Community and Business Liaison Group (CLG) prior to submission to Auckland Council (as per A2N consent condition 19). A record of consultation outcomes is included in Appendix A.

1.4 Relevant Conditions Table 1-1 identifies the resource consent conditions relevant to this ESCP and where they are addressed in the document. Table 1-1: Relevant ESCP Resource Consent conditions and location in the Plan

Condition No.

Condition

Relevant ESCP section

Land use consent R/LUC/2016/1890 conditions

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At least 20 working days prior to the commencement of construction within a Construction Support Area (CSA) or ACZ, the Consent Holder shall submit to the Council (Team Leader Central Monitoring) for certification an ESCP which provides for the management of all bulk earthworks to minimise any discharge of debris, soil, sediment or sediment-laden water beyond the site to either land and/ or stormwater drainage systems.

This ESCP

The Consent Holder shall request the Council's (Team Leader Central Monitoring) determination as to whether the ESCP can be certified, in

Noted

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Erosion and Sediment Control Plan

Condition No.

Condition

Relevant ESCP section

writing, within 10 working days of receipt of the ESCP. No construction activity shall commence until certification from Council is provided. An ESCP shall include, but is not be limited to, the following matters: • identification of construction zones and construction support areas;

2.1, 2.2, 2.3

• specific erosion and sediment control works for each Active Construction Zone (location, dimensions, capacity supporting calculations and design drawings), which should be in line with Industry Best Practice that will meet or exceed the performance of measures detailed in TP90;

3 and Appendix C

• catchment boundaries; 55

• the timing and duration of construction and operation of control works (in relation to the staging and sequencing of earthworks); • details relating to the management of exposed areas;

2.5 and CEMP 3.2.3

• reference to the Flocculent Treatment Management Plan and confirmation of erosion and sediment control measures necessary to give effect to that plan;

3.3 and Appendix D

• reference to the Contaminated Soils Management Plan and confirmation of erosion and sediment control measures necessary to give effect to that plan; and

3.4.1

• monitoring and maintenance requirements, including information on complaint investigation and response procedures, training, and roles and responsibilities.

3.3, 3.4, 4 and CEMP

Any change to an ESCP shall be submitted to the Council (Team Leader Central Monitoring) for certification.

1.6

The Consent Holder shall request the Council's (Team Leader Central Monitoring) written determination as to whether the proposed change can be certified, to be provided within 10 working days of submission of the change. No activity reliant upon a change to the ESCP can be undertaken until the change has been certified.

Noted

The Consent Holder shall comply with the ESCP for the duration of the earthworks associated with the Project.

Noted

Prior to the commencement of bulk earthworks, a certificate signed by a Senior Qualified Person shall be submitted to the Council (Team Leader Central Monitoring) to certify that the erosion and sediment controls (including diversion bunds, silt fences and sumps) have been constructed in accordance with the certified ESCP(s) as required by Condition 53 of this consent.

Noted

The certification from the Senior Qualified Person for these measures shall be supplied to the Council (Team Leader Central Monitoring) immediately upon completion of construction of those measures. Information supplied, if applicable, shall include: • The contributing catchment area; • The shape of structure (dimensions of structure); • The position of inlets/outlets; and

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2.2

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Noted

Erosion and Sediment Control Plan

Condition No.

Condition

Relevant ESCP section

â€˘ The stabilisation of the structure.

The Consent Holder shall ensure that there shall be no deposition of earth, mud, dirt or other debris on any road or footpath resulting from bulk earthworks on the subject site. In the event that such deposition does occur, it shall immediately be removed. In no instance, shall roads or footpaths be washed down with water without appropriate erosion and sediment control measures in place to prevent contamination of the stormwater drainage system, watercourses or receiving waters.

3.2

The operational effectiveness and efficiency of all erosion and sediment control measures specifically required as a condition of resource consent, including the certified ESCP referred to in Condition 53, shall be maintained throughout the duration of earthworks, or until the Project site is permanently stabilised against erosion.

3.3, 3.4, 3.5 and 3.6

The site shall be progressively stabilised against erosion at all stages of earthworks activity and shall be sequenced to minimise the discharge of contaminants to groundwater or surface water.

3.1 and 3.2

The Consent Holder shall ensure that the erosion and sediment control measures are constructed and maintained in accordance with TP90, except where a higher standard is detailed in an ESCP/FTMP, in which case the higher standard shall apply.

Sediment control measures shall be inspected on a weekly basis and after a significant storm event to ensure effective operation.

3.5

The Consent Holder shall ensure that all material removed from or delivered to the Project site shall be covered during transportation.

3.2

Discharge permit R/REG/2016/1898 Any perched groundwater, or surface run-off water, encountered within the excavation area requiring removal shall be considered as potentially contaminated, and shall either: a. be disposed of by a licensed liquid waste contractor; or 145

b. pumped to sewer, providing relevant permits are obtained; or c. discharged to the stormwater system, provided testing demonstrates compliance with 50 times the Australian and New Zealand Environment Conservation Council (ANZECC) Guidelines for Fresh and Marine Water Quality (2000) for the protection of 95 percent of marine water species, and is free from petroleum hydrocarbons.

3, Contamination DWP (CDWP), and Industrial and Trade Activities Environmental Management Plan (ITA EMP).

In the event that any CSA requires an increase in area, the following information shall be provided to the Team Leader â€“ Central Monitoring whose certification shall be requested prior to implementation: 167

a. Plans and drawings outlining the details of the modifications; and b. Supporting information that confirms how the proposal does not affect the capacity or performance of the existing structural and procedural controls.

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Noted

Erosion and Sediment Control Plan

Condition No.

Relevant ESCP section

Condition The Consent Holder shall ensure that the following structural controls are constructed for the following catchment areas and design standards and they are completed prior to discharges commencing from the site: Works/ Controls

Device Catchment Area

2 x Settlement Tanks located on CSA 4

Activity area of grout plant (400m2), and segment storage yard (2660m2) on CSA 4

Settlement Tanks sizing to be based on 2% of the contributing catchment

Inlet protection measures

On all catch pits within CSA areas

2 x Settlement Tanks located in CSA 1, CSA 2, CSA 3, CSA 4 and CSA 5

All Active Construction Zone (ACZ)

Design in accordance with Auckland Council Best Management Practice: Catch pit Protection Area (AC 2015). Settlement Tank sizing to be based on 2% of the contributing catchment

Bunding of Environmentally Hazardous Substances

As required

110% largest container

168

169

Design Requirements

In the event that any minor modifications to the structural system are required, the following information shall be provided to the Team Leader – Central Monitoring whose certification shall be requested prior to implementation: a. Plans and drawings outlining the details of the modifications; and

3.3.1 and 3.3.2

Noted

b. Supporting information that confirms how the proposal does not affect the capacity or performance of stormwater management system. 173

Within 30 days of the installation of the water treatment systems, and prior to operation, the Consent Holder shall develop and submit to the Council (Team Leader Central Monitoring) for certification a discharge monitoring programme.

FTMP (Appendix D)

174

The water quality monitoring programme shall include, but not be limited to:

FTMP (Appendix D)

Water clarity (black disc) cm Turbidity (NTU)

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Erosion and Sediment Control Plan

Condition No.

Condition

Relevant ESCP section

• pH Weekly (in addition to the above) • Total Suspended Solids g/m3 • Total recoverable copper g/m3 • Dissolved copper g/m3 • Total recoverable zinc g/m3 • Dissolved zinc g/m3 • Total petroleum hydrocarbons g/m3 • Ammoniacal nitrogen* g/m3 • Nitrate nitrogen* g/m3 *Applicable only in discharge from treatment systems in CSA 3 and CSA 4, not applicable to Beresford Square CSA (CSA 2) d. identified trigger levels for each of the above parameters. These trigger levels shall be developed with reference to the ANZECC Guidelines for water quality where applicable; and e. the methods and procedures for investigating and reporting stormwater discharge monitoring results to the Council (Team Leader Central Monitoring). 175

The discharge monitoring programme shall be implemented upon completion of works set out in Condition 168.

FTMP (Appendix D)

176

Within five working days of receipt of sample results showing contaminants exceeding the agreed trigger levels in Condition 174(d):

FTMP (Appendix D)

a. An investigation shall be undertaken to determine why exceedances were detected and to identify any additional source controls or treatment required; and b. The results of the investigation shall be reported to the Council (Team Leader Central Monitoring). Discharge Reporting Requirements 177

Within eight weeks following the start of the monitoring required by Condition 173 a monitoring report shall be submitted to the Council (Team Leader Central Monitoring). The monitoring report shall include, but not be limited to, the following:

FTMP (Appendix D)

a. a summary of the monitoring results to date; b. an interpretation of those results and suggestions for improvement to the site operations; c. a programme for ongoing monitoring including the reporting of results; and d. a programme for the ongoing maintenance of the discharge water management and treatment system.

1.5 Sustainability The Link Alliance is seeking an Infrastructure Sustainability Council of Australia (ISCA) Infrastructure Sustainability (IS) Rating. Further details can be found in the CEMP and Sustainability Rating Management Plan. Project sustainability requirements that relate directly to this ESCP are included in Page 10

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Erosion and Sediment Control Plan Appendix B. These requirements are imbedded within this ESCP to ensure that sustainability is a key focus and â€˜the way we do thingsâ€™. In some cases the IS requirements and sustainability goals enhance the designation and consent requirements. Further detail on sustainability is provided in section 1.7 of CEMP.

1.6 ESCP Review and updates This ESCP is a live document that will be reviewed at least annually, or as a result of a material change to the project, or to address unforeseen erosion and sediment runoff effects arising from construction, or unresolved complaints. Any material changes to this ESCP must be certified by Auckland Council prior to any on-site activity reliant upon the change commencing (as per conditions 42 and 43 of resource consent). Refer to the CEMP for further detail on the review and updating process.

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Karangahape Main Works 2.1 Overview of Works

The main construction works for the new Karangahape Station are described in detail in the CEMP and summarised in Table 2-1 below (refer also the drawings provided at Appendix C). It should be noted that construction of the Mercury Lane and Beresford Square station entrance superstructures and other building units, along with the internal station fit out and public realm reinstatement works, does not form part of this ESCP. Separate ESCP are to be prepared in the future, prior to the commencement of the future respective works and stages not covered in this ESCP. Table 2-1: Overview of Main Works Construction Activities

Activity/Stage

Description

General establishment works

• Installation of hoardings and temporary traffic management around active construction zones.

Temporary shaft excavation

• Construction of the temporary shaft at Mercury Lane to provide access for tunnel mining and construction. Works will include piling, excavation, and the construction of the above ground acoustic enclosure surrounding the shaft.

Mined tunnels

• Mining of platform tunnels via the temporary shaft; and • Mining of cross adits and adits connecting to station boxes.

Station box excavations and construction

• Construction of the Mercury Lane station box, involving: Diaphragm Wall construction including guide wall installation; Installation of plunge columns; Top down construction works - excavation and floor slab construction; Bottom up construction works - rock breaking and excavation, construction of floor slab construction and rail platforms; and • Mechanical, Electrical, Fire and Hydraulic (MEFH) installation. •

Construction of the Beresford Square station box, involving: Diaphragm Wall construction; Top down construction - excavation and floor slab construction; and bottom up construction works - rock breaking and excavation, construction of floor slab construction and rail platforms; and • MEFH installation. -

Construction Support Areas (CSAs)

• Continued establishment of Construction Support Areas (CSA) at Beresford Square and Mercury Lane (following on from the Karangahape Station early works and authorised by the early works plans). This will include the bentonite plant, water treatment plant and temporary spoil storage areas. • Operation of the Beresford Square and Mercury Lane CSAs.

2.2 Construction Support Areas The Karangahape main works will be undertaken across two distinct CSAs at Mercury Lane (also known as CSA 4) and Beresford Square (also known as CSA 3). Further detail is provided in section 2.6 of the CEMP and a summary of the key plant and activities within each CSA is provided below. Page 12

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Erosion and Sediment Control Plan Mercury Lane CSA: • • • •

• • • •

•

Bentonite plant (located on the western portion of the site); Storage area for general and hazardous materials (including bentonite and polymer storage); Concrete chute; Specifically designated water treatment area (located on southern portion of the CSA) to treat dirty runoff, water from within excavations, mined tunnels, D-wall water and water from concrete wash-off and runoff collected within the bunds of high risk spillage areas (i.e. bentonite plant); 30KL tank for mine water; Shotcrete silo; Bunded surge pile areas; Entrance/exit (two exits) to CSA for trucks (with stabilised entry and exit). Exits will have cattle grids (judder bars) and manual wheel washes. Water to drain from under the judder bars via open channel to a manhole nominally 1.5m deep and pumped to the water treatment area or disposed offsite via a tanker truck; and Noise enclosure.

Beresford Square CSA: • • •

• •

Bentonite plant (southern portion of the CSA – near the site offices); Storage area for general and hazardous materials (including bentonite and polymer storage); Specifically designated water treatment area to treat dirty runoff (likely located at the eastern end of the ACZ, at the intersection with Beresford Square and Pitt Street), water from within excavations, D-wall water and water from concrete wash-off and runoff collected within the bunds of high risk spillage areas (i.e. bentonite plant); Temporary storage area for materials (rocks, grit and sand) removed by the bentonite desander. Entrance/exit to CSA for trucks (with stabilised entry and exit). Exit will have a cattle grid over a concrete channel and a wheel wash. Water will drain to a manhole nominally 1.5m deep and be pumped to the water treatment area or a tanker truck

2.3 Active Construction Zones The Karangahape Station main works will be undertaken through work zones referred to as Active Construction Zones (ACZ), in accordance with the A2N resource consents. Each CSA supports an ACZ where the station shaft excavations will occur. At Mercury Lane the ACZ is located within the CSA, while at Beresford Square the ACZ is located adjacent to the CSA. Further detail is provided in the CEMP. Erosion and sediment generation is expected to occur throughout the ACZs during the main works.

2.4 Topography and Drainage Karangahape Station contributes to two separate catchments, with Karangahape Road forming the boundary between the two catchments. Pitt Street and Beresford Square drain to north of Karangahape Road into an existing stormwater system, eventually discharging to the Waitematā Harbour by the Central Business District area. There are no flood sensitive areas or major overland flow paths identified in the works area (refer Figure 2-1). The slopes in this area range from 1.5% to 2.7%. Page 13

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Figure 2-1: Overland Flow Paths and Flood Sensitive Areas in Beresford Square and Pitt Street (Source: Auckland Council Geomaps)

Mercury Lane drains to a different catchment south of Karangahape Road and into an existing stormwater system, eventually discharging to the WaitematÄ Harbour by Meola Reef Reserve. There are no flood sensitive areas identified in the works area, but overland flow paths are located along Mercury Lane and Canada Street (refer Figure 2-2). The slope in this area is approximately 9.5%.

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Figure 2-2: Overland Flow Paths and Flood Sensitive Areas in Mercury Lane (Source: Auckland Council Geomaps)

2.5 Construction Methodology The works will be divided into stages as described in the CEMP and the Construction Staging Plans in Appendix B of the CEMP. The construction activity is summarised in Table 2-2 below. Page 15

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Erosion and Sediment Control Plan Table 2-2: Construction Activity, Approximate Earthworks Areas and Volumes

Approx Area (m2)

Construction Activity

Beresford Square

Beresford Square Foundations

3,900

Beresford Square Top Down

27,700

Beresford Square Bottom Up

13,500

Total Beresford Square

Mercury Lane

Approx. earthworks volumes (mᶟ)

1,880

45,100

Temporary Shaft

7,000

Mined Tunnels*

45,300

Mercury Lane Foundations

3,800

Mercury Lane Top Down

23,400

Mercury Lane Bottom Up

18,900 Total Mercury Lane Total for works

6,710*

98,400 143,500

*approximate area includes mined tunnels, which will not be exposed or form part of the catchment area.

2.6 Earthworks Earthworks associated with the Karangahape Station main works will largely comprise: • • •

Excavation of the temporary access shaft at Mercury Lane; Mining of the platform tunnels from within the temporary access shaft; and Excavation of the station boxes at Mercury Lane and Beresford Square, including installation of the D-Wall and piling.

The approximate earthworks areas and volumes required for the works by construction stage are outlined in Table 2-2. Of note, much of this work will be contained within the shaft / station box excavations, or is occurring underground.

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Erosion and Sediment Control and Management

Erosion and sediment control measures will be designed, installed and maintained in accordance with Auckland Council “Erosion and Sediment Control Guide for Land Disturbing Activities in the Auckland Region”, Guideline Document 005 (GD05). It is noted that GD05 has superseded Auckland Council Technical Publication 90 (TP90) “Erosion and sediment control guidelines for land disturbing activities in the Auckland Region”, which is referred to in the resource consent conditions.

3.1 Key Principles Key erosion and sediment control principles applicable to the main works are as follows: •

Selection of construction methodologies and staging of construction to limit the duration and area of earthworks exposed to erosion at any given time. Management of sediment laden water associated with the removal and stockpiling of excavation material. Management of water from mined tunnel operations. Minimise the total area of disturbance by keeping the area of earthworks to a minimum and undertaking progressive stabilisation of exposed areas. Avoidance of overland flow paths (OLFPs) where practicable. Protection and stabilisation of steep slopes through the use of clean water diversion bunds (CWD), and vegetative covers. Monitoring and adjustment of pH levels in water discharge to within acceptable limits. Stabilisation of exposed surface areas as soon as practicable. This may include one or more of the following measures:

• • • • • • •

• •

Application of granular material, straw mulch, hydro-seeding or grassing (either temporarily or permanently). Installation of downslope perimeter controls or diversions around and within the construction area, to detain and treat sediment laden runoff and prevent contamination of the existing stormwater system and receiving environment. Adoption of specific construction practices within the construction area to minimise sedimentation generation during trenching.

Regular inspection and maintenance of sediment control devices.

3.2

Erosion and Sediment Control Measures

3.2.1.

General ESC Measures

Erosion and sediment control measures (ESCM) will be installed prior to the start of any earthworks. The measures will remain in place until reinstatement of active working areas is complete. ESCM identified in Table 3-1 shall be implemented throughout the construction area as illustrated in the ESCP Drawings in Appendix C. All ESCMs shall be designed and maintained in accordance with GD05.

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Erosion and Sediment Control Plan Table 3-1 General Erosion and Sediment Control Measures

ESCM

Application

Catchpit/ Stormwater inlet protection

• •

Diversion channel/bund/hoardings

• • •

Filter socks

• • •

Cover catchpit grates and inlets with geotextile to filter sediment laden runoff before discharge into the stormwater network; or Other proprietary catchpit protection systems, such as silt/filter sock, sand logs, coir logs and hay bales. Install to divert runoff from external catchments entering construction areas or for conveyance of sediment laden runoff within construction areas. Hot mix diversion bunds can be used where kerb and channels have been removed or on impervious surfaces. Diversion bunds must have sufficient capacity to carry the flow safely from a 5% AEP storm, with 300mm freeboard, in accordance with GD05. Filter socks can be used to intercept and impound runoff before it enters a catchpit or other stormwater inlet. Can be used to reduce the velocity of runoff flows within a channel, as a check dam. Contain and impound discharges from pumped stormwater or concrete wash water (as a turkey nest to promote settlement).

Sand logs/coir logs/hay bales

•

Use in carriageway to divert clean water from construction site where there is steep terrain uphill or unfavourable carriageway cross fall.

Dewatering

•

Dewatering devices will be used to pump out any water that collects within the mined tunnels, open trenches or excavation areas, or for sediment control devices for maintenance. A minimum of 100mm water clarity is required to pump out of the works area. If this cannot be achieved, the water shall be pumped to settlement tanks, an on-site treatment device or to a tanker and removed offsite.

•

Settlement Tanks

• •

• Water Quality

• • •

Stabilised entrance and surface

• • •

Truck Wash and/or Shaker Ramp

• •

• • Page 18

Settlement tank sizing is based upon 2% of the exposed area. Water quality standards must be met before discharging to an existing stormwater inlet, whereby pH ranges are between 5.5 to 8.5 and clarity is greater than 100mm. The settlement tanks will be emptied using a vacuum truck when full, and the sediment-laden runoff is to be disposed offsite. Batch dosing of stormwater flows may be required subject to water quality testing conducted on the final discharge. A testing regime shall be established at the discharge point of all CSA treatment facilities to ensure minimum water quality standards are met. Refer to the Flocculent Treatment Management Plan in Appendix D for further detail. Install at egress points for construction outside of the carriageway. Ensure any cut or exposed surfaces within the construction area can be stabilised with aggregates. All aggregates should comply with minimum thickness of 150mm with 50150mm washed aggregate sizing. Any shaker ramps installed should be 5m in length (minimum) to allow for at least one full revolution of a truck tyre. Shaker ramps will need to be placed at the exit and any runoff from the shaker ramp area (including or excluding wheel-wash system) must pass through an appropriate sediment retention device. Localised wheel wash shall be provided where impracticable to install entry and exit stabilised entrances. Truck wash shall connect to a settlement tank or similar retention device to be disposed offsite.

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3.2.2.

Asphalt Works and Concrete Pumping / Pouring

The environmental risk of concrete or asphalt works is high, and it is recommended that drainage channels are completely isolated during these works. If this is not practicable, careful placement of sandbags or bunds should be implemented. Other recommended controls are: • Delay concreting works when bad weather is forecast, if practicable. • Minimise the volume of water used on site (e.g. in dust suppression, concrete cutting) so there is less to control. • Use concrete saws that can have a vacuum attached to minimise the amount of dust produced during cutting, OR use a wet/dry vacuum, to collect all concrete or asphalt contaminated material or runoff on site. • If the above is not practical, divert all runoff to the construction pit/ trench or unsealed ground, away from OLFPs. Runoff or wash water contaminated with concrete fines / dust is highly alkaline and cannot be diluted, therefore all captured runoff from concrete cutting and/or cement mixing must be treated or disposed of off-site. • Wash all equipment and tools in a designated site wash out area. • Do not allow concrete trucks or concrete pumpers to wash out on site unless there is a designated wash out area. • Use tarpaulin sheets under concrete pumps and delivery chutes to capture any spills.

3.2.3.

Erosion and Sediment Source Control

The erosion and sediment source controls listed in Table 3-2 have been identified as applicable to all of the works area. Table 3-2 General source control measures applicable to the works area for elimination and/or minimisation of erosion and sediment generation

Source/Activity

Source Control Measure

General site management

• • •

• • Soil Management & Stockpiles

• • • •

• •

Page 19

Ensure OLFPs are unobstructed and stabilised (if required), if practicable. Check the weather forecast and plan accordingly if there is to be heavy rainfall/wind; Stabilise work areas with high sediment generation potential as soon as practicable by placing geotextile and covering with clean hardfill or other approved method; Regularly sweep or remove any accumulated sediment associated with the works; Refer to the Air Quality Delivery Work Plan (AQ DWP) with regards to dusty exposed working areas to minimise wind distribution of sediments. Soil removal using hydro excavation will be disposed of at an approved offsite facility. All soil removed should be placed in covered trucks for off-site transport. Stockpiles are to be in construction areas serviced by ESCMs only. Stockpiles of fine material shall be dampened or covered to reduce the potential for windblown sediments or the generation of sediment laden runoff, refer to the AQ DWP for details. Stockpiles shall be located away from OLFPs. Hazardous construction materials (if any) shall be stored in an isolated and bunded area in accordance with the CEMP.

| Karangahape Station Main Works

Erosion and Sediment Control Plan Source/Activity

Source Control Measure

D-Wall Construction

•

DWD discharge (including Bentonite) from the D-Wall construction is to be discharged to settlement tank.

Sediment transport due to runoff from external catchments entering the construction site

•

Construct diversion bunds/channel to divert runoff from external catchments entering land disturbance sites; and Use clean water diversions (e.g. sandbags, compacted earth, bund) where there is steep terrain uphill of the works area to reduce the volume of water requiring management.

Open Excavation

•

• Erosion due to runoff travelling over reinstated ground

•

The works include permanent excavations for construction of underground sub-structure, station boxes and shafts. Dewatering of excavations must be pumped to a retention device (settlement device) and/or removal. Do not remove ESCMs until the reinstatement of active working areas is established.

3.3 Specific Erosion and Sediment Control Measures 3.3.1.

Mercury Lane

The section details erosion and control measures that will be implemented for construction work within Mercury Lane. The Mercury Lane CSA footprint and ESCM are shown on the ESCP Drawings provided in Appendix C. The Mercury Lane CSA layout is also shown in Figure 3-1 below. The following erosion and sediment controls will be implemented during the works: •

• •

• • •

Page 20

Stabilised entrance will be provided at the entrances/exits level to Mercury Lane where practicable. The truck exit areas shall have a shaker ramp/judder bars installed so that sediment is not transported out of the construction area. The shaker ramp shall have adequate teeth depth so that material dropped from one vehicle is not picked up by the next. Sediment laden water from the shaker ramp/wash area will be diverted to a sediment retention facility. Where it is not practicable to implement these control measures, the minimum requirement will be the provision of a localised wheel wash or shaker ramps for trucks, with a temporary holding tank positioned within the CSA to capture runoff. Catchpit inlet protection will be required at all stormwater catchpit(s) within the work area which discharges into the existing stormwater network. Diversion channel/bund/hoardings to divert clean water away from the construction zone to a stormwater inlet and dirty water to a settlement tank. Clean water and dirty water diversion (CWD and DWD) must have sufficient capacity to carry the flow safely from a 5% AEP storm. During staging of the works large amounts of the Mercury Lane CSA will be hardstand, with clean water diversions in place around these areas. Bunding within the site will be utilised to contain high-risk water requiring a high level of treatment for pH and/or fine sediments. Pumping & Dewatering DWD discharge from excavation, mining and collection catchpits to be pumped to a settlement tank. Settlement tanks (indicative total capacity 134.5m3) placed in the Mercury Lane CSA to service the wheel wash for the trucks, mined tunnel operational water as well as runoff within CSA. The settlement tanks will be emptied using hydro-excavation when full and the sediment-laden runoff will be disposed of at an appropriate off-site location. Two in-line | Karangahape Station Main Works

Erosion and Sediment Control Plan settlement tanks are proposed, designed to service at minimum 2% of the contributing catchment area with tank sizing outlined in Table 3-. DWD discharge from settlement tank to be pumped to a water treatment plant where appropriate or discharged to trade waste (refer FTMP in Appendix D). Provision will be made for the treatment of water from mining operations at Mercury Lane. This includes both operational water from the use of a roadheader and groundwater ingress into the mined tunnels. Water from the mined tunnels will be pumped to a settlement tank (indicative sizing 30m3) with further treatment undertaken if necessary. As excavations and works progress, water within the excavated site is to be captured in sump, pumped to gravity mains and conveyed to treatment devices for treatment before discharge, either to the Council stormwater system or Watercare’s wastewater system in Canada Street. It is anticipated that site discharges from some areas will require a high level of treatment for pH and/or fine sediments before discharge from a treatment device on Mercury Lane.

•

Figure 3.1: Site location - Mercury Lane CSA

3.3.2.

Beresford Square

The section details erosion and control measures that will be implemented for construction work within Beresford Square. The Beresford Square CSA footprint and ESCM are shown on the ESCP Drawings provided in Appendix C. The Beresford Square CSA layout is also shown in Figure 3-2 below. The following erosion and sediment controls will be implemented during the works: • Page 21

Stabilised entrance will be provided at the entrance/exit level to Beresford Square where practicable. The truck exit area shall have a wheel wash / shaker ramp installed so that | Karangahape Station Main Works

Erosion and Sediment Control Plan

• •

•

sediment is not transported out of the construction area. The shaker ramp shall have adequate teeth depth so that material dropped from one vehicle is not picked up by the next. Sediment laden water from the shaker ramp/wash area will be diverted to a sediment retention facility. Where it is not practicable to implement these control measures, the minimum requirement will be the provision of a localised wheel wash or shaker ramps for trucks, with a temporary holding tank positioned within the CSA to capture runoff. Catchpit inlet protection will be required at all stormwater catchpits within the work area which discharges into the existing stormwater network. Diversion channel/bund/hoardings to divert clean water away from the construction zone to a stormwater inlet and dirty water to a settlement tank. Clean water and dirty water diversion (CWD and DWD) must have sufficient capacity to carry the flow safely from a 5% AEP storm. Pumping & Dewatering DWD discharge from excavation and collection catchpits to be pumped to settlement tanks. Settlement tank (indicative total capacity 37.6m3) will be installed in the Beresford Square CSA or ACZ to service the runoff from the site. The settlement tanks will be emptied using hydro-excavation when full and the sediment-laden runoff will be disposed of at an appropriate off-site location. Two in-line settlement tanks are proposed, designed to service at minimum 2% of the contributing catchment area with tank sizing outlined in Section 3.3.3. DWD discharge from settlement tank to be pumped to a water treatment plant where appropriate or discharged to trade waste (refer FTMP in Appendix D). As excavations and works progress, water within the excavated site is to be captured in sumps, pumped to gravity mains and conveyed to treatment devices for final testing and treatment before discharge, either to the Council stormwater system or Watercare’s wastewater system in Hopetoun Street. It is anticipated that site discharges will require a high level of treatment for pH and/or fine sediments.

Figure 3.2: Site location - Beresford Square CSA 2 Page 22

| Karangahape Station Main Works

Erosion and Sediment Control Plan

3.3.3. Settlement Tank Sizing The general methodology for sediment-laden runoff is to divert to a collection sump or dewater from excavations and mining, pump captured runoff to a settlement tank or transport to the water treatment area for treatment prior to discharge to the stormwater system. Indicative settlement tank volumes are listed in Table 3-3 and the actual volumes required will be ultimately determined by the following factors: • It is unlikely that the entire catchment of the site will be destabilised at any one time. Clean water from any clean and stabilised areas can be diverted offsite without requiring treatment. • Clean water will be diverted from the roof of site offices and the noise enclosure at Mercury Lane, greatly reducing the catchment size for a large proportion of the main works construction period. • The settlement tank units will be sized based on the open excavation area at any one time, the contributing catchment areas are only indicative, subject to confirmation on site, and generally represent a worst case scenario. • The mined tunnels excavations have been included in the catchment calculation for completeness, however these works will be underground with the access covered by the noise enclosure. • Settlement tanks at Mercury Lane will have provision for treatment of water from mined tunnel operations and groundwater ingress. • Rainfall runoff volume within the sites is estimated for the 20 year ARI design event, not taking into account climate change. More conservative rainfall events can be used to size the settlement tanks based on the site conditions at the time of construction, subject to any potential adverse weather forecast. • The pump size and flow rate. Table 3-3 Settlement Tank Sizing for Mercury Lane and Beresford Square CSAs

CSA

Settlement Tank Sediment Retention

Contributing Area (m2)

Catchment

Indicative Settlement Tank Volume (m3) *

Lane

(Sediment Retention) SR containing 2 in-line tanks (included in the water treatment area)

6,710m2

134.5m3

Beresford Square CSA

(Sediment Retention) SR containing 2 in-line tanks (included in the water treatment area)

1,800m2

37.6m3

Mercury CSA

* Minimum volume for settlement retention device is calculated as 2% of the contributing catchment area, although this provisionally includes mined tunnels area for Mercury Lane.

3.3.4. Water Treatment Chemical treatment may be required during construction and this can be provided in containerised settlement tanks, which may include a chemical treatment unit.

Page 23

| Karangahape Station Main Works

Erosion and Sediment Control Plan The water treatment system is a settlement-based treatment system that will be located within each CSA/ACZ where required, refer to drawings in Appendix C of this ESCP. Each system will include chemical treatment capability to assist the settlement process when required. A FTMP is provided in Appendix D of this ESCP and outlines the following: • • • •

Soil testing. Chemical dosing options. Storage and handling of chemicals. Responsibilities for the operation and maintenance of the water treatment system.

3.4

Other Considerations

3.4.1.

Contamination

In accordance with the Contamination Delivery Work Plan (CDWP), refer Appendix M of the CEMP, the main works area contains uncontrolled fill and the current/historical surrounding commercial/industrial land use activities present a risk of contaminated soil being encountered during land disturbance activities. Until further contaminated land investigation works are undertaken, it must be assumed that the uncontrolled fill contains elevated concentrations of contaminants. Section 4.2 of the CDWP outlines additional erosion control measures that will be implemented during all land disturbance activities, including cleaning up spillages of soil during placement in trucks as soon as practicable to avoid contaminated soil being trafficked by trucks and transported off-site. Any groundwater that is encountered during earthworks will be considered potentially contaminated until otherwise tested. Groundwater will be collected and discharged in accordance with a Trade Waste Permit or discharge to the stormwater system, where sampling has been undertaken and results show compliance with 50 times the Australian and New Zealand Environment Conservation Council (ANZECC) Guidelines for Fresh and Marine Water Quality (2000). During all land disturbance activities, site staff will actively monitor active work areas for the conditions/materials specified in the CDWP. Section 6 of the CDWP outlines the measures to be implemented if suspected contaminated material is discovered.

3.4.2.

Dust Control

Land disturbance activities shall be undertaken in accordance with the Air Quality Delivery Work Plan (AQ DWP) (Appendix I of the CEMP) in order to minimise the potential for dust generation.

3.5

Monitoring During Construction

All site-specific erosion and sediment control measures will be inspected on a weekly basis and after rainfall events by the construction team. Inspection will include, but will not be limited to, the requirements outlined in Table 3-4. Table 3-4 Monitoring Requirements for ESCM

Erosion Control

and

Sediment

Seven day forecast

weather

Page 24

Inspection/Maintenance Requirements

Frequency

•

Daily

| Karangahape Station Main Works

Works will be programmed in accordance with weather predictions (refer Metservice 3 Day rain forecast and 7 days weather forecast).

Erosion and Sediment Control Plan Erosion Control

and

Sediment

Catchpit / Stormwater Inlet Protection

Inspection/Maintenance Requirements

Frequency

•

Check for damage, blockages and leaks – repair immediately. Remove accumulated sediment immediately.

Daily, before & after rainfall

Check for scour and areas where a breach may or has occurred – repair immediately. Remove sediment build up deposited in the DWD channel. Check for low spots, formation of gullies or debris – repair immediately.

Weekly & after rainfall

• Clean & Diversion Channels

Dirty Water Bunds and

• • •

Settlement Tanks

•

Check if the tank is full, then empty using vacuum truck and the sediment-laden runoff to be disposed offsite.

Weekly rainfall

Drains and sumps / pumps

•

Visual check that drains and pumps are not blocked and are operating satisfactorily.

Daily & after rainfall

Concrete works

•

Make sure the rate of flow of diverted or wash water does not exceed the ground’s soakage capacity, and clean up any fines or solids left after the water has soaked into the ground. Regularly check that drain plugs, enclosure, sandbags or bunds are in place and are working effectively.

At least once daily

Check quantity of aggregate and geotextile for sediment build up and deterioration – apply more aggregate as required. Check aggregate thickness and if not GD05 to specification then apply more aggregates or change as required.

Weekly & after rainfall

Check for any structure used to trap runoff and clean it out. Add further aggregate as necessary if aggregate thickness is not to specification or mud blockage is evident.

Weekly & after rainfall

and

Asphalt

•

Stabilised Entranceway and Surface

•

Truck Wash and/or Shaker Ramp

• •

and

Influent water quality entering the settlement tank units and water treatment system

Details provided in the FTMP (provided in Appendix D)

Refer to FTMP

Effluent water quality exiting the settlement tank units and water treatment system

Details provided in the FTMP (provided in Appendix D)

Refer to FTMP

Application of chemical treatment

If assisted settlement is required using nonchemical or chemical coagulants/flocculants, monitoring of dosing rates will be required. Details provided in the FTMP (provided in Appendix D)

Refer to FTMP

3.6

Heavy Rainfall Response & Contingency Measures

The works are planned to extend over 3 years, between Q1 2020 and Q1 2023. Page 25

| Karangahape Station Main Works

after

Erosion and Sediment Control Plan High intensity rainfall events can occur during the summer months as well as prolonged rain events during winter months. The Link Alliance will monitor weather forecasts, inspect all erosion and sediment control measures for adequacy, and undertake any remedial works required prior to forecasted rain events.

3.7

Site Reinstatement

Decommissioning of ESCM shall only occur once the active works areas are permanently stabilised. Due care will be taken during the removal process so as not to mobilise any sediment.

Page 26

| Karangahape Station Main Works

Erosion and Sediment Control Plan

Roles and Responsibilities, Training and Complaint Response

4.1

Roles and Responsibilities

The key environmental management roles during construction are outlined in the CEMP. However, all site personnel will be responsible for following the requirements of this ESCP during the works.

4.2

Training

All site staff will undergo general environmental awareness training and training about their responsibilities relating to this ESCP. Training requirements are described in detail in the CEMP. Specific training requirements relating to this ESCP are outlined in Table 4-1. Table 4-1:

ESCP training requirements

Training requirements

Frequency

Attendance

ESCP requirements and resource consent conditions

As required and during new staff induction

All new site staff

Toolbox meetings on site to include ESC as a standard agenda item

Weekly toolbox meetings, or as required (e.g. start of new substantial activity)

All site staff

Construction, maintenance and inspections of ESC devices

As required

Site supervisors and site staff with ESC management responsibilities

4.3

Complaints

Any complaints received during the main works shall be recorded and promptly investigated to identify and resolve the cause of the complaint in accordance with the complaints response protocol detailed in the main works Communication and Consultation Plan (Appendix G of the CEMP).

Page 27

| Karangahape Station Main Works

Erosion and Sediment Control Plan

Appendix A: Record of CLG Comments A Karangahape CLG meeting was held on 12 November to discuss the Karangahape Station main works and for the CLG to provide comments / feedback on the CEMP and sub-plans. No specific comments were received on this ESCP.

Page 28

| Karangahape Station Main Works

Erosion and Sediment Control Plan

Appendix B: ISCA Requirements The project is using the Infrastructure Sustainability Council of Australia (ISCA) Infrastructure Sustainability (IS) Rating tool. This appendix details IS requirements that are different, or additional to the CRL designation and resource consent requirements. It is essential that these requirements are met to achieve the project’s sustainability goals; however they are not consent requirements to be certified by Auckland Council. These IS rating requirements are included as an appendix because they are not yet fixed. They remain subject to change as the Project’s sustainability program evolves. Applicable ISCA categories that relate to this ESCP are listed in Table A below along with their associated target Levels. For each category, a description is provided of how this target level has been achieved. Table B-1:ISCA Requirements

Credit

Requirements *

Relevant Sections in DWP and Other Relevant Documents

Receiving Water Quality DIS-1 Level 1

DIS-2 Level 2

DIS-3 Level 3

Measures to minimise adverse impacts to receiving wai environmental values during construction and operation have been identified and implemented. These measures demonstrate an awareness of the values of wai ora and its Mauri, and opportunity for mana whenua feedback has been provided and where practicable incorporated into these measures. AND Monitoring of wai discharges and receiving wai is undertaken at appropriate intervals and at times of discharge during construction.

Sections 2, 3 and 5.1

Monitoring and modelling of wai discharges and receiving wai demonstrates no adverse impact on receiving wai environmental values. The infrastructure does not increase peak stormwater flows for rainfall events of up to a 1.5 year ARI event discharge

Sections 3.3 and 3.4

Opportunities to improve receiving wai environmental values have been identified and implemented. Monitoring and modelling demonstrates improvement of receiving wai environmental values

Section 3

Other relevant Documents: • CEMP • Contamination Delivery Work Plan (CDWP), refer Appendix M of the CEMP.

Other relevant Document: • CEMP

Also refer to the Sustainability Ratings Management Plan

Replace potable wai (water) WAT-2 Level 1

Monitoring demonstrates that some proportion of total wai use is from non-potable sources (substituting for potable).

N/A

* Refer to ISCA Rating Tool for full details of the requirement

Page 29

| Karangahape Station Main Works

Erosion and Sediment Control Plan

Appendix C: ESCP Drawings

Page 30

| Karangahape Station Main Works

CROS S ST

54 .0 0 54.

65.0

53 .5

54.

65.0

CAN ADA ST

ISO A1 594mm x 841mm

5 55.

238

55.0

5 53.

Y LA R U C MER 57. 5

SITE EX

URY L ANE

53 .5 53 .0 53.0

52.5

SITE S

11-13

MAIN SHAFT PLATFORM SS

52.5

258

D-WALL CONSTRUCTION: REMOVE REDUNDANT SERVICES. SET UP BATCH PLANT FOR D-WALL CONSTRUCTION. 3. EXCAVATE GUIDE WALL PERIMETER, 600m3 MUCKAWAY 190m (L) x 2m (W) x 1.5m (D) 4. CONSTRUCT CONCRETE GUIDE WALLS, POUR 150M3 CONCRETE. 5. MOBILISE HYDROFRAISE CUTTER, GRAB CRANE AND SERVICE CRANE. 6. EXCAVATE D-WALLS IN STAGES WITH BENTONITE/POLYMER INSTALLATION. 7. PROGRESSIVELY MUCK AWAY SPOIL, APPROX 3,100m3 TOTAL. 8. PROGRESSIVELY DELIVER REINFORCEMENT CAGES FOR D-WALLS. 9. POUR CONCRETE FOR D-WALL IN STAGES, TOTAL 3,100m3. 10. VACUUM TOP OF CONCRETE TO CUT OFF LEVEL. 11. DEMOBILISE HYDROFRAISE, GRAB CRANE AND BATCH PLANT.

52.0

256

53.0

WHEEL WASH. SEE NOTE 3

EXISTING CATCHPIT TO BE PROTECTED

R WATE MENT T TREA EM SYST

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

TORAG

59.0

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2 WHEEL WASH. SEE NOTE 3

23-31

Last saved by: STUART.GODFREY(2020-03-17) Last Plotted: 2020-03-17 Filename: AECOM_DS10_AU\Documents\60604837-CRL C3-Alliance Detail Design\DesignJV\900 CAD-GIS\01_WIP\20-SHEET\142 Environmental Management\CRL-KRD-RME-LKA-DRG-172001

E FFIC O E SIT

53.0

XIT SITE E 246-254

.0 56

MERC

53.5

1. 2.

D-WALL

9A SS SS ccSS

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

BATCH PLANT FOR D-WALLS

CLEAN WATER DIVERSIONS DIRTY WATER

EAST

WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED) WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT 8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER EXISTING WASTEWATER

12.5 m

1:250

CLIENT:

MERCURY LANE SITE OUTLINE

PARKING CLOSURES Link Alliance has prepared this document for the sole use of the client and for a specific purpose, each as expressly stated in the document. No other third party should rely on this document without the written consent of Link Alliance. Link Alliance undertakes no duty, nor accepts any responsibility, to any third party who may rely upon or use thisCRL_KRD_142_00_LKA_DRG_172001 document. 10

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

6.25

BUNDS

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050mm Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM THEN DISCHARGE OFFSITE.

LEGEND

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

SITE ACCESS

52.0

MONITOR RUN-OFF AND FLOW PATHS

NOTES: 1.

52.0

EXISTING CATCHPIT TO BE PROTECTED

STORMWATER CONTROLS: 1.

52.5

52.0

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

This drawing is confidential and shall only be used for the purpose of this project. The signing of this title block confirms the design and drafting of this project have been prepared and checked in accordance with the Link Alliance quality assurance system to ISO 9001. Printed copies of this document are UNCONTROLLED.

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (1/7) Q1-Q2 2020 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172001

REVISION

A00

55.

CROS S ST

53 .5

54.

65.0

CAN ADA ST

ISO A1 594mm x 841mm

238

55.0

0 54.

58 .0

65.0

53.

57. 5

.0 54

E FFIC O E SIT

53.0

R WATE MENT T TREA EM SYST

MAIN SHAFT PLATFORM

CONSTRUCT FOUNDATIONS AND WORKING PLATFORM.

EXCAVATE TEMPORARY SHAFT DOWN TO ROCK LEVEL, MUCK AWAY APPROX 2500m3 SPOIL.

INSTALL RING BEAMS PROGRESSIVELY.

BREAK THROUGH ROCK DOWN TO REQUIRED DEPTH, CART OUT APPROX. 2000m3 ROCK.

INSTALL ROCK BOLTS AND SHOTCRETE AS NECESSARY.

CONSTRUCT NOISE SHELTER ABOVE EXCAVATED SHAFT OPENING.

SS SS

SPOIL AREA

D-WALL

9A SS SS

MONITOR RUN-OFF AND FLOW PATHS

SS SS

CLEAN WATER DIVERSIONS DIRTY WATER

EAST

WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED) WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT 8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER

1:250

CLIENT:

MERCURY LANE SITE OUTLINE

PARKING CLOSURES Link Alliance has prepared this document for the sole use of the client and for a specific purpose, each as expressly stated in the document. No other third party should rely on this document without the written consent of Link Alliance. Link Alliance undertakes no duty, nor document. accepts any responsibility, to any third party who may rely upon or use thisCRL_KRD_142_00_LKA_DRG_172002 20

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

EXISTING WASTEWATER

12.5 m

6.25

BUNDS

LEGEND

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

SS SS

BATCH PLANT FOR D-WALLS

SITE ACCESS

52.0

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

NOTES: 1.

52.0

EXISTING CATCHPIT TO BE PROTECTED

STORMWATER CONTROLS: 1.

52.5

INSTALL SHEET-PILES DOWN TO ROCK HEAD.

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM.

52.0

52.5

258

17m diameter, 22m deep excavated shaft for mined tunnel access.

53.0

SITE S

11-13

TEMPORARY SHAFT CONSTRUCTION:

52.0

256

52.5

TEMP SHAFT

53.0

WHEEL WASH. SEE NOTE 3

EXISTING CATCHPIT TO BE PROTECTED

TORAG

59.0

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

9 Last saved by: STUART.GODFREY(2020-03-17) Last Plotted: 2020-03-17 Filename: AECOM_DS10_AU\Documents\60604837-CRL C3-Alliance Detail Design\DesignJV\900 CAD-GIS\01_WIP\20-SHEET\142 Environmental Management\CRL-KRD-RME-LKA-DRG-172002

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

23-31

SS 3

WHEEL WASH. SEE NOTE 3

XIT SITE E 246-254

53 .5 53 .0

ANE

53.5

SITE EX

URY L

MERC

ANE

YL RCUR

GROUNDWATER AND MINE WATER PUMPED UP TEMPORARY SHAFT TO WATER TREATMENT SYSTEM.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

This drawing is confidential and shall only be used for the purpose of this project. The signing of this title block confirms the design and drafting of this project have Printed copies of this document are UNCONTROLLED. been prepared and checked in accordance with the Link Alliance quality assurance system to ISO 9001.

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (2/7) Q1-Q3 2020 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172002

REVISION

A00

55.

CROS S ST

53 .5

54.

65.0

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM.

CAN ADA ST

ISO A1 594mm x 841mm

238

55.0

0 54.

58 .0

65.0

53.

57. 5

.0 54

E FFIC O E SIT

R WATE MENT T TREA EM SYST

SITE S

52.0

256

53.0

TEMP SHAFT

53.0

52.5

WHEEL WASH. SEE NOTE 3

EXISTING CATCHPIT TO BE PROTECTED

59.0

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

11-13

MAIN SHAFT PLATFORM SS

52.5

258

NOISE SHELTER

TEMPORARY PLUNGED-IN COLUMNS:

PROGRESSIVELY DELIVER PLUNGED COLUMN SECTIONS TO SITE.

WELD TOGETHER FOR FULL COLUMN LENGTH.

INSTALL COLUMN INTO PILE AND POUR CONCRETE.

BACKFILL ABOVE CONCRETE CUT-OFF AS REQUIRED.

REPEAT AT ALL PROPOSED COLUMN POSITIONS.

SPOIL AREA

MUCK-AWAY APPROX. 500m3 BORED PILE MATERIAL.

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM.

EXCAVATION AREA AND CONCRETE SLAB

9A SS SS

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

NOTES:

38 SS SS

LEGEND 20

DIRTY WATER

EAST

WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED) WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT

8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER EXISTING WASTEWATER

12.5 m

1:250

CLIENT:

MERCURY LANE SITE OUTLINE

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

6.25

CLEAN WATER DIVERSIONS

BUNDS

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

STORAGE, ENVIRONMENTAL CONTROLS AND COVERED SPOIL AREA

SITE ACCESS

52.0

MONITOR RUN-OFF AND FLOW PATHS

DRAIN CLEAN ROOF RUNOFF TO 30m3 TANKS IF SPACE ALLOWS. OVERFLOW TO COUNCIL STORMWATER PIPES IN CANADA ST.

EXISTING CATCHPIT TO BE PROTECTED

STORMWATER CONTROLS:

52.5

DRILL BORED PILE WITH TEMP SUPPORT CASING AS NECESSARY TO REQUIRED DEPTH.

52.0

Approximately 17no. steel columns 35m deep.

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

23-31

SS 3

53.0

XIT SITE E 246-254

WHEEL WASH. SEE NOTE 3

ANE

53.5

SITE EX

53 .5 53 .0

URY L

TORAG

MERC

ANE

YL RCUR

GROUNDWATER AND MINE WATER PUMPED UP TEMPORARY SHAFT TO WATER TREATMENT SYSTEM.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (3/7) Q2-Q3 2020 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172003

REVISION

A00

55.

CROS S ST

53 .5

54.

65.0

CAN ADA ST

ISO A1 594mm x 841mm

238

55.0

0 54.

58 .0

65.0

53.

.0 54

E FFIC O E SIT

XIT SITE E

53.0

SS SS

53.0

52.5

SITE S

11-13

52.5

258

EXCAVATION AREA AND CONCRETE SLAB

NOISE SHELTER

BREAKOUT CONCRETE GUIDE WALLS AND CLEAR RUBBLE.

52.0

SPOIL AREA

EXCAVATE GROUND FLOOR SLAB AREA 45m (W) X 40m (L) X 1.1m (D)

9A MUCK AWAY APPROX 1,800m3 SPOIL.

PROGRESSIVELY DELIVER REINFORCEMENT FOR SLABS.

EXISTING CATCHPIT TO BE PROTECTED

DRAIN CLEAN ROOF RUNOFF TO 30m3 TANKS IF SPACE ALLOWS. OVERFLOW TO COUNCIL STORMWATER PIPES IN CANADA ST.

52.0

52.5

L0 GROUND FLOOR SLAB CONSTRUCTION:

52.0

CONSTRUCT 1000mm THICK FLOOR SLAB (UNDERGROUND STATION ROOF), APPROX. 1,600m3 CONCRETE.

STORMWATER CONTROLS:

SITE ACCESS

MONITOR RUN-OFF AND FLOW PATHS

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

STORAGE, ENVIRONMENTAL CONTROLS AND COVERED SPOIL AREA

NOTES: 1.

LEGEND BUNDS

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

CLEAN WATER DIVERSIONS DIRTY WATER

WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT 8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER EXISTING WASTEWATER

12.5 m

6.25

CATCHPIT (EXISTING IF NOTED)

1:250

MERCURY LANE SITE OUTLINE

PARKING CLOSURES Link Alliance has prepared this document for the sole use of the client and for a specific purpose, each as expressly stated in the document. No other third party should rely on this document without the written consent of Link Alliance. Link Alliance undertakes no duty, nor document. accepts any responsibility, to any third party who may rely upon or use thisCRL_KRD_142_00_LKA_DRG_172004 20

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050mm Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM THEN DISCHARGE OFFSITE.

EAST

WATER TREATMENT DEVICE

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

52.0

CLIENT:

52.0

INDICATIVE OPENINGS IN GROUND LEVEL CONCRETE SLAB.

TEMP SHAFT

53.0

TORAG

WHEEL WASH. SEE NOTE 3

EXISTING CATCHPIT TO BE PROTECTED

R WATE MENT T TREA EM SYST

256

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

23-31

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

59.0

246-254

WHEEL WASH. SEE NOTE 3

ANE

53.5

SITE EX

URY L

53 .5 53 .0

57. 5

MERC

ANE

YL RCUR

GROUNDWATER AND MINE WATER PUMPED UP TEMPORARY SHAFT TO WATER TREATMENT SYSTEM.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (4/7) Q3 2020 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172004

REVISION

A00

55.

CROS S ST

53 .5

54.

65.0

CAN ADA ST

ISO A1 594mm x 841mm

238

55.0

0 54.

58 .0

65.0

53.

53.5

SITE EX

E FFIC O E SIT

L0 ML ENTRANCE SSL 58893

ANE

B1 ML SOUTH SSL 51643

53.0

XIT SITE E

SITE S

11-13

52.5

258 LEVEL 1 AND B2 CONSTRUCTION BELOW GROUND

TOP DOWN CONSTRUCTION B1-B2 BELOW GROUND L0:

NOISE SHELTER

LEVEL B1 POUR CONCRETE 950m3

LEVEL B2 EXCAVATE 7,400m3 SPOIL

LEVEL B2 POUR CONCRETE 900m3 PART OF B2 EXCAVATION MAY BE THROUGH ROCK

52.5

LEVEL B1 EXCAVATE 8,700m3 SPOIL

52.0

SPOIL AREA 9A

TIPPER TRUCKS MOVE SPOIL TO SITE STOCK PILE OR MUCK AWAY OFF SITE.

PROGRESSIVELY DELIVER STEEL REINFORCEMENT AND CONCRETE.

DRAIN CLEAN ROOF RUNOFF TO 30m3 TANKS IF SPACE ALLOWS. OVERFLOW TO COUNCIL STORMWATER PIPES IN CANADA ST.

52.0

CRAWLER CRANE EXTRACT SKIPS WITH SPOIL TO GROUND LEVEL.

52.0

EXISTING CATCHPIT TO BE PROTECTED

STORMWATER CONTROLS:

SITE ACCESS

MONITOR RUN-OFF AND FLOW PATHS

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

STORAGE, ENVIRONMENTAL CONTROLS AND COVERED SPOIL AREA

NOTES: 1.

LEGEND BUNDS

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

CLEAN WATER DIVERSIONS DIRTY WATER

WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT

8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER EXISTING WASTEWATER

12.5 m

6.25

CATCHPIT (EXISTING IF NOTED)

1:250

MERCURY LANE SITE OUTLINE

PARKING CLOSURES Link Alliance has prepared this document for the sole use of the client and for a specific purpose, each as expressly stated in the document. No other third party should rely on this document without the written consent of Link Alliance. Link Alliance undertakes no duty, nor document. accepts any responsibility, to any third party who may rely upon or use thisCRL_KRD_142_00_LKA_DRG_172005 20

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050mm Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM THEN DISCHARGE OFFSITE.

EAST

WATER TREATMENT DEVICE

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

52.0

CLIENT:

52.0

256

53.0

B7 UNDER PLATFORM SSL 32243

53.0

52.5

WHEEL WASH. SEE NOTE 3

B6 PLATFORM SSL 33643

38367

EXISTING CATCHPIT TO BE PROTECTED

TORAG

B5 ML SO UTH SSL

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

R WATE MENT T TREA EM SYST

B3 ML SOUTH SSL 40442 B4 ML SOUTH SSL 39643

59.0

246-254

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

23-31

B2 ML SOUTH SSL 45493

ML SOUTH DWALL TOE 43150

WHEEL WASH. SEE NOTE 3

URY L

MERC

53 .5 53 .0

57. 5

ANE

YL RCUR

GROUNDWATER AND MINE WATER PUMPED UP TEMPORARY SHAFT TO WATER TREATMENT SYSTEM.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (5/7) Q4 2020 - Q2 2021 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172005

REVISION

A00

55.

CROS S ST

53 .5

54.

65.0

CAN ADA ST

ISO A1 594mm x 841mm

238

55.0

0 54.

58 .0

65.0

53.

53.5

SITE EX

E FFIC O E SIT

L0 ML ENTRANCE SSL 58893

ANE

B1 ML SOUTH SSL 51643

53.0

XIT SITE E

SITE S

11-13

LEVEL B4, B6 & B7 CONSTRUCTION BELOW GROUND

LEVEL B4: BREAK AND EXCAVATE 6,400m3. SHOTCRETE AND ROCK BOLT AS REQUIRED

LEVEL B6: ROCK BREAK AND EXCAVATE 5,300m3. SHOTCRETE AND ROCK BOLT AS REQUIRED

LEVEL B7: ROCK BREAK AND EXCAVATE 2,500m3 SPOIL. SHOTCRETE AND ROCK BOLT AS REQUIRED.

NOISE SHELTER

LEVEL B7: CONSTRUCT CONCRETE FLOOR SLAB 1,400m3. CONSTRUCT WALLS 700m3.

INSTALL TEMPORARY STEEL PROPS TO SUPPORT CONSTRUCTION OF LEVEL B4 SLAB.

LEVEL B4: CONSTRUCT CONCRETE FLOOR SLAB 800m3, CONSTRUCT WALLS 550m3.

52.5

INSTALL DRAINAGE SYSTEM LEVEL B7

52.0

SPOIL AREA 9A

EXISTING CATCHPIT TO BE PROTECTED

52.0

DRAIN CLEAN ROOF RUNOFF TO 30m3 TANKS IF SPACE ALLOWS. OVERFLOW TO COUNCIL STORMWATER PIPES IN CANADA ST.

52.0

STORMWATER CONTROLS:

SITE ACCESS

MONITOR RUN-OFF AND FLOW PATHS

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

STORAGE, ENVIRONMENTAL CONTROLS AND COVERED SPOIL AREA

NOTES: 1.

LEGEND BUNDS

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

CLEAN WATER DIVERSIONS DIRTY WATER

WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT

8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER EXISTING WASTEWATER

12.5 m

6.25

CATCHPIT (EXISTING IF NOTED)

1:250

MERCURY LANE SITE OUTLINE

PARKING CLOSURES Link Alliance has prepared this document for the sole use of the client and for a specific purpose, each as expressly stated in the document. No other third party should rely on this document without the written consent of Link Alliance. Link Alliance undertakes no duty, nor document. accepts any responsibility, to any third party who may rely upon or use thisCRL_KRD_142_00_LKA_DRG_172006 20

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050mm Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM THEN DISCHARGE OFFSITE.

EAST

WATER TREATMENT DEVICE

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

52.0

CLIENT:

52.5

258

TOP DOWN CONSTRUCTION B1-B2 BELOW GROUND L0:

52.0

256

53.0

B7 UNDER PLATFORM SSL 32243

53.0

52.5

WHEEL WASH. SEE NOTE 3

B6 PLATFORM SSL 33643

38367

EXISTING CATCHPIT TO BE PROTECTED

TORAG

B5 ML SO UTH SSL

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

R WATE MENT T TREA EM SYST

B3 ML SOUTH SSL 40442 B4 ML SOUTH SSL 39643

59.0

246-254

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

23-31

B2 ML SOUTH SSL 45493

ML SOUTH DWALL TOE 43150

WHEEL WASH. SEE NOTE 3

URY L

MERC

53 .5 53 .0

57. 5

ANE

YL RCUR

GROUNDWATER AND MINE WATER PUMPED UP TEMPORARY SHAFT TO WATER TREATMENT SYSTEM.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (6/7) Q1 2021 - Q2 2022 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172006

REVISION

A00

55.

CROS S ST

53 .5

54.

65.0

CAN ADA ST

ISO A1 594mm x 841mm

238

55.0

0 54.

58 .0

65.0

53.

.0 54

E FFIC O E SIT

R WATE MENT T TREA EM SYST

EXISTING CATCHPIT TO BE PROTECTED

53.0

SITE S

52.0

256

52.5

WHEEL WASH. SEE NOTE 3

53.0

TORAG

59.0

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

11-13

52.5

258

NOISE SHELTER

.0 52

SPOIL AREA

DELIVER MEFH EQUIPMENT TO SITE ABOVE GROUND, INCLUDING: ESCALATORS ELEVATORS TUNNEL VENTILATION BATHROOMS PIPES/DUCTS CABLES, FIXTURES, TILES, ETC

EXISTING CATCHPIT TO BE PROTECTED

DRAIN CLEAN ROOF RUNOFF TO 30m3 TANKS IF SPACE ALLOWS. OVERFLOW TO COUNCIL STORMWATER PIPES IN CANADA ST.

52.0

52.5

52.0

MECHANICAL, ELECTRICAL, FIRE & HYDRAULIC (MEFH):

UNLOAD MEFH FROM SEMI TRAILERS INTO SITE.

LOWER MEFH EQUIPMENT INTO STATION LEVELS VIA OPENINGS

52.0

STORMWATER CONTROLS:

SITE ACCESS

MONITOR RUN-OFF AND FLOW PATHS

SILT SOURCE CONTROL USING SILT SOCKS, SILT FENCES OR GEOTEXTILE AS REQUIRED.

STORAGE, ENVIRONMENTAL CONTROLS AND COVERED SPOIL AREA

NOTES: 1.

LEGEND BUNDS

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

CLEAN WATER DIVERSIONS DIRTY WATER

WHEEL WASH

16 14

SEDIMENT RETENTION DEVICE/MANHOLE 12 SITE VEHICLE ACCESS/EXIT 8 EXISTING STORMWATER SS

25-27

PROPOSED WASTEWATER EXISTING WASTEWATER

12.5 m

6.25

CATCHPIT (EXISTING IF NOTED)

1:250

CLIENT:

MERCURY LANE SITE OUTLINE

PARKING CLOSURES Link Alliance has prepared this document for the sole use of the client and for a specific purpose, each as expressly stated in the document. No other third party should rely on this document without the written consent of Link Alliance. Link Alliance undertakes no duty, nor document. accepts any responsibility, to any third party who may rely upon or use thisCRL_KRD_142_00_LKA_DRG_172007 20

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050mm Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM THEN DISCHARGE OFFSITE.

EAST

WATER TREATMENT DEVICE

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

52.0

SEDIMENT RETENTION DEVICE / MANHOLE SEE NOTE 2

23-31

SS 3

53.0

XIT SITE E 246-254

WHEEL WASH. SEE NOTE 3

ANE

53.5

SITE EX

URY L

53 .5 53 .0

57. 5

MERC

ANE

YL RCUR

GROUNDWATER AND MINE WATER PUMPED UP TEMPORARY SHAFT TO WATER TREATMENT SYSTEM.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK MERCURY LANE EROSION AND SEDIMENT CONTROL PLAN (7/7) Q1 2021 - Q3 2022 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 172007

REVISION

ISO A1 594mm x 841mm

TRAFFIC MANAGEMENT: Majority conducted during Early Works

61.0

61.5

C RA

CONTAIN CLEAN WATER FLOWS AT EDGE OF HOARDINGS

61.5

RETAINING WALLS

62.0

R TE

HOARDING INSTALLATION: Approx. 600m, combination of fixed and movable barriers.

TT PI 62.5

62.0

OPE T O UN S T

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS. EXISTING CATCHPIT TO BE PROTECTED

NOTES:

PARKING CLOSURE

STORAGE AREA (ASPHALT OR CONCRETE)

63.5

nF nG

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

63.5

S BU ST

SITE OFFICES, WELFAR E FACILITIES AND SERV ICE SET-UP DURING EARL Y WORKS

63.0

CSA2

Traffic attenuator trucks temporarily diverting traffic. Crane truck deliver and install fencing. Drill/fix hoarding posts into ground/concrete blocks. Install plywood and banners for hoarding. Road closure and parking closure signage repositioned accordingly. Necessary line-marking conducted.

1. 2. 3. 4. 5. 6.

OFFICE ROOF WATER DIVERTED TO STORMWATER

DISCHARGE CLEAN WATER TO KERB

ON T YN

Traffic attenuator trucks temporarily diverting traffic. Traffic barriers and cones setup behind safety of attenuator trucks. Road closure and parking closure signage erected. Necessary line-marking conducted. Bus stops removed on Pitt Street.

OP D

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050 Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM OR DISCHARGE OFFSITE.

Last saved by: STUART.GODFREY(2020-03-09) Last Plotted: 2020-03-17 Filename: AECOM_DS10_AU\Documents\60604837-CRL C3-Alliance Detail Design\DesignJV\900 CAD-GIS\01_WIP\20-SHEET\142 Environmental Management\CRL-KRD-RME-LKA-DRG-171001

EXISTING CATCH PIT TO BE PROTECTED

SEDIMENT RETENTION DEVICE / MANHOLE

PRIVATE ACCESS TO BE MAINTAINED

HOARDING/BARRIERS

64.5

SEE NOTE 2 WHEEL WASH. SEE NOTE 3 ABOVE

SITE ACCESS

0 64.

63.

53.5

SITE EXIT

64.5

.5 0 65. 64. 0

65 .0

63.5

62.5

64.5

61.0

. 63

EXISTING CATCHPITS TO BE PROTECTED TEMPORARY DIRTY WATER SUMP

PRIVATE ACCESS TO BE MAINTAINED

PARKING CLOSURE

PRIVATE ACCESS TO BE MAINTAINED

NEGLIGIBLE CLEAN FLOW AROUND OUTSIDE OF HOARDING. SEAL BOTTOM OF HOARDING AND DIRECT FLOWS TO DRAINAGE

WORKS AREA RUNOFF CONTAMINATION NOT SEVERE

EXISTING CATCHPIT TO BE PROTECTED

60.5

59.5

4. 5. 6.

ROAD CLOSED

58. 5

Storage containers. Install Retaining walls Supply conduits/pipes to shaft for D-Wall construction. Excavate trench 50m (L) x 2m (W) x 1m (D) in road reserve (100m3), install pipes and backfill. Pedestrian access and private parking shall be maintained. Set up environmental controls. Set up waste management area. Water treatment and covered spoil areas if required.

1. 2. 3.

no vehicles or vehicle parking access to private properties maintained

SITE FACILITIES/CSA: Continue setup from Early Works.

60.0

59.0

58.5

57.5

PARKING CLOSURE

MAIN SHAFT PLATFORM 63.0

59.5

58.0

57.0

56.5

56.0

55.5

55.0 54.5

EXISTING CATCHPITS TO BE PROTECTED

50m (L) x 2m (W) x 1m (D) TRENCH FOR D-WALL PIPES/CONDUITS

R CL OA O D SE D

62.0

BERESFORD SQ

61.5

54.0

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

LEGEND BUNDS EXISTING CATCHPIT TO BE PROTECTED

66.0

CLEAN WATER DIVERSIONS DIRTY WATER

WHEEL WASH SEDIMENT RETENTION DEVICE/MANHOLE

6.25

12.5 m

G AN

APE

66 .5

SITE VEHICLE ACCESS

66.0

CATCHPIT (EXISTING IF NOTED)

1:250

CLIENT:

BERESFORD SQUARE SITE OUTLINE

100mm

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

SCALE

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK BERESFORD SQUARE EROSION AND SEDIMENT CONTROL PLAN (1/6) Q1-Q2 2020 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 171001

REVISION

A00

ISO A1 594mm x 841mm

D-WALL CONSTRUCTION: 61.0

61.5

OFFICE ROOF WATER DIVERTED TO STORMWATER

4. 5.

SS SS

8. 9. 10. 11.

62.5

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

TT PI

PO 62.0

H OPE T O UN S T

ON T YN

RR E T

CATCHPIT/SUMP IF REQUIRED

NOTES: 1.

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE OR PUMPED TO WATER TREATMENT PLANT

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050 Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP OR WATER TREATMENT SYSTEM OR DISCHARGE OFFSITE.

63.0

Remove redundant services. Set up batch plant for D-Wall construction. Excavate shaft perimeter, 600m3 muckaway approx. 200m (L) x 2m (W) x 1.5m (D) Construct concrete guide walls, pour 200m3 concrete. Mobilise Hydrofraise cutter, grab crane and service crane. Excavate D-Walls in stages with bentonite/polymer installation. Progressively muck away spoil with staged stockpiling at CSA, approx 4,000m3 total. Progressively deliver reinforcement cages for D-Walls. Pour concrete for D-Wall in stages, total 4,000m3. Vacuum top of concrete to cut off level. Demobilise Hydrofraise and grab crane.

1. 2. 3.

CONTAIN CLEAN WATER FLOWS AT EDGE OF HOARDINGS

HIGH RISK CONTAINMENT. TREAT FOR pH AND FINE SEDIMENTS

62.0

61.5

EXISTING WASTEWATER LINE. CONNECTIONS TO COUNCIL AND WATERCARE PIPES IN HOPETOWN ST.

D-walls constructed in stages together with hoarding re-positioning to maintain vehicle access to private properties, trafficable plates may be used in conjunction

STORAGE AREA (ASPHALT OR CONCRETE)

SITE OFFICES, WELFAR E FACILITIES AND SERV ICE SET-UP DURING EARL Y WORKS

TRUCK ACCESS

EXISTING CATCH PIT TO BE PROTECTED

64.5 SW

63.

62.0

MAIN SHAFT PLATFORM SW

63.0

59.5

0 65.

62.5

64.5

61.0

60.5

. 63

R TE

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

NT E ST SY

EXISTING CATCHPIT TO BE PROTECTED

ME AT

E TR

59.5

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

58. 5

no vehicles or vehicle parking access to private properties maintained

ROAD CLOSED

60.0

59.0

58.5

57.5

54.5

64. 0

63.5

65 .0

58.0

57.0

56.5

55.5

55.0

61.5

54.0

TRUCK ACCESS

53.5

PERIMETER GUIDE WALL

PRIVATE ACCESS TO BE MAINTAINED

DIAPHRAGM WALL

LEGEND DA

BUNDS CLEAN WATER DIVERSIONS DIRTY WATER WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED) WHEEL WASH

66.0

EXISTING CATCHPIT TO BE PROTECTED

SEDIMENT RETENTION DEVICE/MANHOLE SITE VEHICLE ACCESS/EXIT EXISTING STORMWATER

PROPOSED STORMWATER

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

EXISTING WASTEWATER

6.25

12.5 m

G AN

APE

66.0

66 .5

R CL OA O D SE D

PARKING CLOSURE

64.5 SW

BERESFORD SQ

SW SW

0 64.

SITE ACCESS

SWADJACENT TO EXISTING CATCHPITS AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS. SW

DIRTY WATER RISING MAIN CSA2 TO WATER TREATMENT SYSTEM

WHEEL WASH. SEE NOTE 3 ABOVE

SITE EXIT

SEDIMENT RETENTION DEVICE / MANHOLE SW SW

PRIVATE ACCESS TO BE MAINTAINED

HOARDING/BARRIERS

SEE NOTE 2

56.0

63.5

TRUCK ACCESS 63.5

CSA2

1:250

CLIENT:

BERESFORD SQUARE SITE OUTLINE

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK BERESFORD SQUARE EROSION AND SEDIMENT CONTROL PLAN (2/6) Q2-Q4 2020 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 171002

REVISION

A00

ISO A1 594mm x 841mm

L0 GROUND FLOOR SLAB CONSTRUCTION: 61.0

CONTAIN CLEAN WATER FLOWS AT EDGE OF HOARDINGS

61.5

HIGH RISK CONTAINMENT. TREAT FOR pH AND FINE SEDIMENTS

Sections of concrete slab shall be constructed in stages to maintain vehicle access to private parking. Trafficable plates may also be utilised as crossings.

NOTES:

SS SS

62.5

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

TT PI

H OPE T O UN S T

ON T YN

R TE

PO 62.0

OFFICE ROOF WATER DIVERTED TO STORMWATER

3. 4. 5.

C RA

62.0

61.5

EXISTING WASTEWATER LINE. CONNECTIONS TO COUNCIL AND WATERCARE PIPES IN HOPETOWN ST.

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050 Ã˜ MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM OR DISCHARGE OFFSITE.

CATCHPIT/SUMP IF REQUIRED

63.0

STORAGE AREA (ASPHALT OR CONCRETE)

SITE OFFICES, WELFAR E FACILITIES AND SERV ICE SET-UP DURING EARL Y WORKS

64.5 SW

63.

64. 0

63.5

65 .0

62.5

64.5

61.0

60.5

. 63

INDICATIVE FLOOR SLAB OPENING FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

EXISTING CATCHPIT TO BE PROTECTED

59.5

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

53.5

58. 5

no vehicles or vehicle parking access to private properties maintained

ROAD CLOSED

60.0

59.0

58.5

57.5

54.5

GROUND LEVEL EXCAVATION AND L0 CONCRETE SLAB

63.0

0 65.

62.0

59.5

58.0

57.0

56.5

55.5

55.0

61.5

54.0

R CL OA O D SE D

TRUCK ACCESS

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

0 64.

64.5 SW

BERESFORD SQ

SW SW

LEGEND DA

BUNDS CLEAN WATER DIVERSIONS DIRTY WATER WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED) WHEEL WASH

66.0

EXISTING CATCHPIT TO BE PROTECTED

SEDIMENT RETENTION DEVICE/MANHOLE SITE VEHICLE ACCESS/EXIT EXISTING STORMWATER

EXISTING WASTEWATER

6.25

12.5 m

G AN

APE

66.0

PROPOSED WASTEWATER

66 .5

SWADJACENT TO EXISTING CATCHPITS AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS. SW

SITE ACCESS

WHEEL WASH. SEE NOTE 3 ABOVE

SITE EXIT

TRUCK ACCESS

INDICATIVE FLOOR SLAB OPENINGS FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

SEDIMENT RETENTION DEVICE / MANHOLE SW SEE NOTE 2 SW

56.0

63.5

TRUCK ACCESS 63.5

DIRTY WATER RISING MAIN CSA2 TO WATER TREATMENT SYSTEM

1:250

CLIENT:

BERESFORD SQUARE SITE OUTLINE

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

CSA2

Breakout concrete guide walls and clear rubble. Excavate proposed shaft ground floor/roof slab area 20m (W) x 90m (L) x 1.5m (D) Combined muckaway and/or stockpile at CSA 1,600m3. Progressively deliver reinforcement for slabs. Construct reinforced concrete floor slab (station roof), approx 1,500m3 concrete.

1. 2.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK BERESFORD SQUARE EROSION AND SEDIMENT CONTROL PLAN (3/6) Q4-Q1 2021 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 171003

REVISION

A00

ISO A1 594mm x 841mm

TOP DOWN CONSTRUCTION BELOW L0: 61.0

C RA

OFFICE ROOF WATER DIVERTED TO STORMWATER

61.5

HIGH RISK CONTAINMENT. TREAT FOR pH AND FINE SEDIMENTS

62.0

TT PI

SS SS

62.5

OPE T O UN S T

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

CATCHPIT/SUMP IF REQUIRED

63.0

ON T YN

R TE

PO 62.0

EAST section levels B1 & B2. WEST section levels B1, B2, B3 & B4. 1. Position hoarding into required locations for remainder of Top-Down construction phase. 2. Maintain necessary traffic management to allow access for vehicles to private property parking. Excavate and top-down construct station slabs below L0 3. Level B1 EAST & WEST: excavate 8,000m3, pour concrete 4. 900m3 5. Level B2 EAST & WEST: excavate 8,000m3, pour concrete 1,300m3 Part of Level B3 and B4 excavation may be through rock. Level B3 EAST: rock break and excavate 3,800m3, pour 6. concrete 600m3 7. Level B4 EAST: rock break and excavate 3,000m3, pour concrete 480m3 Crane extracts skips with spoil to ground level. 8. Tipper trucks move spoil to site stock pile or muck away off 9. site. 10. Multiple deliveries of steel and concrete.

61.5

EXISTING WASTEWATER LINE. CONNECTIONS TO COUNCIL AND WATERCARE PIPES IN HOPETOWN ST.

NOTES:

STORAGE AREA (ASPHALT OR CONCRETE)

SITE OFFICES, WELFAR E FACILITIES AND SERV ICE SET-UP DURING EARL Y WORKS

SW SW

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050 Ø MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM OR DISCHARGE OFFSITE.

TRUCK ACCESS

63.

0 64.

64.5 SW

TRUCK ACCESS

EAST ►

63.0

◄ WEST

0 65.

62.5

64.5

61.0

. 63

INDICATIVE FLOOR SLAB OPENING FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

59.5

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

60.5

53.5

58. 5

no vehicles or vehicle parking access to private properties maintained

ROAD CLOSED

60.0

59.0

58.5

57.5

54.5

64. 0

63.5

65 .0

62.0

59.5

58.0

57.0

56.5

56.0

55.5

55.0

R CL OA O D SE D

61.5

54.0

BERESFORD SQ

SW SW SW

L1 BS ROOF SSL 70693

LEGEND

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

64.5

SWADJACENT TO EXISTING CATCHPITS AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS. SW

SITE ACCESS

Last saved by: STUART.GODFREY(2020-03-10) Last Plotted: 2020-03-17 Filename: AECOM_DS10_AU\Documents\60604837-CRL C3-Alliance Detail Design\DesignJV\900 CAD-GIS\01_WIP\20-SHEET\142 Environmental Management\CRL-KRD-RME-LKA-DRG-171004

WHEEL WASH. SEE NOTE 3 ABOVE

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

INDICATIVE FLOOR SLAB OPENINGS FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

DIRTY WATER RISING MAIN CSA2 TO WATER TREATMENT SYSTEM

SEDIMENT RETENTION DEVICE / MANHOLE SW SEE NOTE 2 SW

SITE EXIT

63.5

CSA2

TRUCK ACCESS 63.5

BUNDS

L0 BS ENTRANCE SSL 64593

CLEAN WATER DIVERSIONS DIRTY WATER

B1 BS NORTH SSL 58643

WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED)

B2 BS NORTH SSL 53643

◄ WEST

WHEEL WASH

EAST ►

SEDIMENT RETENTION DEVICE/MANHOLE SITE VEHICLE ACCESS/EXIT

EXISTING CATCHPIT TO BE PROTECTED

66.0

B3 BS NORTH SSL 48643

B4 BS NORTH SSL 43643

EXISTING STORMWATER

EXISTING WASTEWATER

B6 PLATFORM SSL 33643 B7 UNDER PLATFORM SSL 32243

6.25

12.5 m

66 .5

G AN

APE

66.0

B5 BS NORTH SSL 38643

PROPOSED WASTEWATER

1:250

CLIENT:

BERESFORD SQUARE SITE OUTLINE

100mm

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

SCALE

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK BERESFORD SQUARE EROSION AND SEDIMENT CONTROL PLAN (4/6) Q1 2021 - Q4 2021 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 171004

REVISION

A00

ISO A1 594mm x 841mm

BOTTOM UP CONSTRUCTION: 61.0

C RA

OFFICE ROOF WATER DIVERTED TO STORMWATER

61.5

HIGH RISK CONTAINMENT. TREAT FOR pH AND FINE SEDIMENTS

62.0

TT PI

SS SS

62.5

OPE T O UN S T

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

CATCHPIT/SUMP IF REQUIRED

NOTES:

63.0

ON T YN

R TE

PO 62.0

EAST section levels B5, B6 & B7. WEST section level B3. Level B5 EAST: rock break and excavate 2,500m3. 1. Shotcrete and rock bolt as required. Level B6 EAST: rock break and excavate 2,500m3. 2. Shotcrete and rock bolt as required. 3. Level B7 EAST: rock break and excavate 1,000m3. Shotcrete and rock bolt as required. 4. Install drainage system and structures at Level B7. Level B3 WEST: rock break and excavate 5,400m3, pour 5. concrete slab 700m3, construct walls 450m3. Level B7 EAST: Construct concrete slab 400m3, construct 6. walls 350m3. 7. Install temporary steel props to support construction of B5 East. Level B5 EAST: Construct concrete slab 400m3, construct 8. walls 270m3. 9. Level B6 EAST: Construct station platform (in-situ and precast concrete) approx. 200m3.

61.5

EXISTING WASTEWATER LINE. CONNECTIONS TO COUNCIL AND WATERCARE PIPES IN HOPETOWN ST.

STORAGE AREA (ASPHALT OR CONCRETE)

SITE OFFICES, WELFAR E FACILITIES AND SERV ICE SET-UP DURING EARL Y WORKS

SW SW

63.

0 64. 64.5

EAST ►

63.0

◄ WEST

0 65.

62.5

64.5

61.0

. 63

INDICATIVE FLOOR SLAB OPENING FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

59.5

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

60.5

58. 5

no vehicles or vehicle parking access to private properties maintained

ROAD CLOSED

60.0

59.0

58.5

57.5

54.5

64. 0

63.5

65 .0

62.0

61.5

59.5

58.0

57.0

56.5

56.0

55.5

55.0

R CL OA O D SE D

TRUCK ACCESS

53.5

54.0

BERESFORD SQ

SW SW

TRUCK ACCESS

64.5

SITE ACCESS

L1 BS ROOF SSL 70693

LEGEND

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050 Ø MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM OR DISCHARGE OFFSITE.

SWADJACENT TO EXISTING CATCHPITS AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS. SW

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

63.5

WHEEL WASH. SEE NOTE 3 ABOVE

63.5

TRUCK ACCESS

INDICATIVE FLOOR SLAB OPENINGS FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

DIRTY WATER RISING MAIN CSA2 TO WATER TREATMENT SYSTEM

SEDIMENT RETENTION DEVICE / MANHOLE SW SEE NOTE 2 SW

SITE EXIT

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

CSA2

BUNDS

L0 BS ENTRANCE SSL 64593

CLEAN WATER DIVERSIONS DIRTY WATER

B1 BS NORTH SSL 58643

WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED)

B2 BS NORTH SSL 53643

◄ WEST

WHEEL WASH

EAST ►

SEDIMENT RETENTION DEVICE/MANHOLE SITE VEHICLE ACCESS/EXIT

EXISTING CATCHPIT TO BE PROTECTED

66.0

B3 BS NORTH SSL 48643

B4 BS NORTH SSL 43643

EXISTING STORMWATER

EXISTING WASTEWATER

B6 PLATFORM SSL 33643 B7 UNDER PLATFORM SSL 32243

6.25

12.5 m

66 .5

G AN

APE

66.0

B5 BS NORTH SSL 38643

PROPOSED WASTEWATER

1:250

CLIENT:

BERESFORD SQUARE SITE OUTLINE

100mm

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

SCALE

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK BERESFORD SQUARE EROSION AND SEDIMENT CONTROL PLAN (5/6) Q4 2021 -Q4 2022 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 171005

REVISION

A00

ISO A1 594mm x 841mm

MECHANICAL, ELECTRICAL, FIRE & HYDRAULIC (MEFH): 61.0

OFFICE ROOF WATER DIVERTED TO STORMWATER

61.5

HIGH RISK CONTAINMENT. TREAT FOR pH AND FINE SEDIMENTS

TT PI

NOTES:

SS SS

62.5

EXISTING CATCHPITS ADJACENT TO AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS.

62.0

H OPE T O UN S T

R TE

NUMBER AND LOCATION OF SEDIMENT RETENTION DEVICES AND WATER TREATMENT SYSTEMS ARE INDICATIVE ONLY . THESE WILL BE DETERMINED BY THE CONSTRUCTION STAFF AND ARE LIKELY TO MOVE AS WORKS PROCEED.

SEDIMENT RETENTION DEVICE OR MANHOLE TO CAPTURE RUNOFF. TO BE EMPTIED WHEN FULL AND DISCHARGED OFFSITE

WHEEL WASH. CATTLE GRID OVER CONCRETE CHANNEL FALLS TO 1050 Ø MANHOLE, NOMINALLY 1.5m DEEP WITH SUBMERSIBLE PUMP TO TANKER OR WATER TREATMENT SYSTEM OR DISCHARGE OFFSITE.

CATCHPIT/SUMP IF REQUIRED

63.0

ON T YN

STORAGE AREA (ASPHALT OR CONCRETE)

SITE OFFICES, WELFAR E FACILITIES AND SERV ICE SET-UP DURING EARL Y WORKS

64.5 SW

63.

64.5 SW

EAST ►

63.0

◄ WEST

0 65.

62.5

64.5

61.0

. 63

INDICATIVE FLOOR SLAB OPENING FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

59.5

TEMPORARY DIRTY WATER COLLECTION SUMP WITH SUBMERSIBLE PUMP. PUMP TO TANKER TRUCK OR RISING MAIN TO WATER TREATMENT SYSTEM

60.5

58. 5

no vehicles or vehicle parking access to private properties maintained

ROAD CLOSED

60.0

59.0

58.5

57.5

54.5

64. 0

63.5

65 .0

62.0

59.5

58.0

57.0

56.5

55.5

55.0

61.5

54.0

R CL OA O D SE D

TRUCK ACCESS

53.5

LEGEND DA

BUNDS CLEAN WATER DIVERSIONS DIRTY WATER WATER TREATMENT DEVICE CATCHPIT (EXISTING IF NOTED) WHEEL WASH

66.0

EXISTING CATCHPIT TO BE PROTECTED

SEDIMENT RETENTION DEVICE/MANHOLE SITE VEHICLE ACCESS/EXIT EXISTING STORMWATER

EXISTING WASTEWATER

6.25

12.5 m

G AN

APE

66.0

PROPOSED WASTEWATER

66 .5

BERESFORD SQ

SW SW

0 64.

SITE ACCESS

TRUCK ACCESS

INDICATIVE FLOOR SLAB OPENINGS FOR CONSTRUCTION ACCESS. BUND AROUND ALL OPENINGS TO PREVENT RAINWATER INGRESS

DIRTY WATER RISING MAIN CSA2 TO WATER TREATMENT SYSTEM

WHEEL WASH. SEE NOTE 3 ABOVE

SITE EXIT

56.0

63.5

TRUCK ACCESS 63.5

CSA2

1:250

CLIENT:

BERESFORD SQUARE SITE OUTLINE

100mm

SCALE

SIZE

AS SHOWN

DESIGNED REVISIONS

DESIGNATION BOUNDARY

SEDIMENT RETENTION DEVICE / MANHOLE SW SEE NOTE 2 SW

SWADJACENT TO EXISTING CATCHPITS AND DOWN GRADIENT OF WORK AREA TO BE PROTECTED WITH FILTER SOCKS AND CATCH PIT BAGS. SW

Deliver MEFH equipment to site above ground, including: Escalators Elevators Tunnel Ventilation Bathrooms Pipes/ducts Cables, fixtures, tiles, etc Unload MEFH from semi trailers into site.

1. 2.

C RA

62.0

61.5

EXISTING WASTEWATER LINE. CONNECTIONS TO COUNCIL AND WATERCARE PIPES IN HOPETOWN ST.

FOR CONSENT APPROVED

PROJECT:

TITLE:

SCG A00 REV

CONSENT ISSUE DESCRIPTION

2020-03-17

CHECKED

DATE

APPROVED

DATE

2020-03-17

KARANGAHAPE STATION

ZONE:

CS DRAWN

CITY RAIL LINK BERESFORD SQUARE EROSION AND SEDIMENT CONTROL PLAN (6/6) Q1 2021 -Q1 2023 PROJECT

DOCUMENT:

ZONE

DISCIPLINE

ORGANISTION

TYPE

SHEET

CRL - KRD - RME - LKA - DRG - 171006

REVISION

A00

Erosion and Sediment Control Plan

Appendix D: Flocculent Treatment Management Plan (FTMP)

Page 31

| Karangahape Station Main Works

Karangahape Station Main Works Flocculant Treatment Management Plan

Revision: 000 Date: 18 March 2020

Flocculant Treatment Management Plan

Karangahape Station Main Works â€“ Flocculant Treatment Management Plan This document is uncontrolled when printed. This document should be printed in colour

Revision Status Revision 000

Date 18/03/2020

Version details

Prepared By

Approved By

Final for lodgement

Caroline Secretin

Peter Roan

Approval Status Name/Title

Signature

Date

Prepared by:

Caroline Secretin Senior Environmental Scientist

18/3/2020

Reviewed by:

Duane Rollo Associate Director - Civil Infrastructure

18/3/2020

Authorised by:

Peter Roan Consenting Lead

18/3/2020

Page 2

| Karangahape Station Main Works

Flocculant Treatment Management Plan

Table of contents Glossary ......................................................................................................... 5 1. Introduction ............................................................................................. 6 1.1

Purpose of the FTMP ..................................................................................................... 6

1.2

FTMP Structure ............................................................................................................. 7

1.3

Relevant Conditions ...................................................................................................... 7

1.4

Sustainability .............................................................................................................. 11

1.5

FTMP Review and updates........................................................................................... 11

2. Karangahape Main Works ...................................................................... 12 2.1

Overview of Works ...................................................................................................... 12

2.2

Construction Support Areas ......................................................................................... 12

2.3

Active Construction Zone............................................................................................. 12

2.4

Construction Methodology and Programme................................................................. 13

3. Chemical Treatment System Details ....................................................... 13 3.1

Standards and guidelines documents ........................................................................... 13

3.2

Water Treatment Devices ............................................................................................ 13

3.2.1. 3.3

Water treatment technologies ..................................................................................... 15

Soil Testing.................................................................................................................. 17

3.3.1.

Test Procedure .............................................................................................................. 18

3.4

Potential Flocculants and Coagulants ........................................................................... 18

3.5

Dosing Options............................................................................................................ 19

3.6

Chemical Treatment Performance................................................................................ 20

4. Storage and Handling of Chemicals ........................................................ 21 5. Emergency and Spillage ......................................................................... 21 6. Responsibility for Operation, Maintenance and Monitoring .................. 21 7. Inspection and Maintenance .................................................................. 22 8. Water Quality Discharge Monitoring Programme .................................. 25

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8.1

Sampling Locations...................................................................................................... 25

8.2

Monitoring Parameters ............................................................................................... 25

8.2.1.

Daily............................................................................................................................... 25

8.2.2.

Weekly .......................................................................................................................... 25

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Flocculant Treatment Management Plan 8.3

Monitoring Methods ................................................................................................... 25

8.3.1.

Daily............................................................................................................................... 25

8.3.2.

Weekly .......................................................................................................................... 26

8.4

Trigger Levels .............................................................................................................. 27

8.4.1.

Daily Parameters Trigger Levels .................................................................................... 27

8.4.2.

Weekly Parameters ....................................................................................................... 27

8.5

Monitoring reports ...................................................................................................... 29

8.5.1.

Initial monitoring report ............................................................................................... 29

8.5.2.

Non-conforming result report....................................................................................... 29

8.5.3.

Annual monitoring reports ........................................................................................... 30

Appendix A: ISCA Requirements .................................................................. 31 Appendix B: Record of CLG Comments ......................................................... 32

Page 4

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Flocculant Treatment Management Plan

Glossary Abbreviation / Acronym ACZ CSA ESC ESCP ESRP FTMP HCl NA PAC WQDMP Term Flocculation Required water quality discharge standard

Sediment retention device Water treatment

Water treatment device Water treatment system Document ANZECC (2000) Guidelines GD05 Golder Water Quality Assessment Report

Page 5

Description Active Construction Zone Construction Support Area Erosion and Sediment Control Erosion and Sediment Control Plan Emergency Spill Response Plan Flocculant Treatment Management Plan Hydrochloric Acid Not applicable Polyaluminium Chloride Water Quality Discharge Monitoring Programme Description The use of chemical or non-chemical coagulants and flocculants to assist settlement. The required groundwater and surface run-off quality to be discharged to stormwater is defined as per resource consent condition 145c, i.e. provided testing demonstrates compliance with 50 times the Australian and New Zealand Environment Conservation Council (ANZECC) Guidelines for Fresh and Marine Water Quality (2000) for the protection of 95 percent of marine water species, and is free from petroleum hydrocarbons. A device where sediment-laden runoff is captured for settlement to occur, this can be a containerised settlement tank or any settlement device. Water treatment (also referred to as chemical treatment) includes flocculation, coagulation, and pH adjustment involving the usage of chemical or non-chemical products. A device to assist settlement via flocculation and/or pH adjustment using chemical or non-chemical reactants. It is typically used in addition to a sediment retention device. A standalone sediment retention device, or a combination of a sediment retention device and a water treatment device to treat discharge to the required water quality discharge standard. An example is the water treatment areas (within the CSAs). Description Australian and New Zealand Environment Conservation Council Guidelines for Fresh and Marine Water Quality (ANZECC 2000), 2018. Erosion and Sediment Control Guide for Land Disturbing Activities in the Auckland Region â€“ Guideline document 2016/005 (GD05), Auckland Council, June 2016. Auckland City Rail Link A2N Water Quality Assessment, Golder Associates (NZ) Limited, May 2016.

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Flocculant Treatment Management Plan

Introduction

The City Rail Link (CRL) project comprises the construction, operation and maintenance of a 3.4 km underground passenger railway, running between Britomart Station and the North Auckland Rail Line in the vicinity of Mt Eden Station. The CRL also involves the construction of two new underground stations at Aotea and Karangahape and a redeveloped Mt Eden Station (refer to Figure 1-1). The design and construction of the CRL infrastructure between the Aotea and Mt Eden Stations is being delivered by the Link Alliance.

Figure 1-1 CRL Route and Location

This Flocculant Treatment Management Plan (FTMP) has been prepared in relation to the Karangahape Station main works and is attached as an appendix to the Erosion and Sediment Control Plan (ESCP). The details of the water treatment system (refer to section 3 of this FTMP) are yet to be developed and will occur as part of the onsite ESCP implementation, following soil testing.

1.1 Purpose of the FTMP This FTMP has been prepared to identify measures that will be implemented to enhance the effectiveness of the erosion and sediment control (ESC) measures utilised on site. The objectives of the FTMP are: â€˘

To manage all bulk earthworks to minimise any discharge of debris, soil, sediment or sediment-laden water beyond the site to either land and/or stormwater drainage systems; and

â€˘

To detail how the discharges of water from the site will be monitored to ensure compliance with the above.

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Flocculant Treatment Management Plan This FTMP also includes the Water Quality Discharge Monitoring Programme. This FTMP addresses the requirements of conditions 59 to 64 and 173 to 179 of the CRL regional resource consent (land use consent R/LUC/2016/1890)1 and will be implemented throughout the construction period. This FTMP forms part of the ESCP for the Karangahape Station main works, attached as Appendix H to the CEMP, and should be read in conjunction with the ESCP and the other relevant main works Delivery Work Plans (DWP) and Management Plans (MP) required by the designation and resource consent conditions.

1.2

FTMP Structure

This FTMP is structured as follows: • • •

• • • • •

Section 1 details the project background, outlines the purpose of the FTMP, the scope of the FTMP, and highlights relevant resource consent conditions. Section 2 provides an overview of the works and the construction support areas (CSA) site layout. Section 3 describes the water treatment systems, the use of flocculants and coagulants for chemical treatment and the testing procedure to determine the chemical type and dosage used, and the different dosing options. Section 4 details the storage and handling of chemicals. Section 5 describes the response plan in place for any emergency or spillage of chemicals used during the chemical treatment activities. Section 6 details the implementation and operation of the FTMP and also covers roles, responsibilities and training requirements. Section 7 details the monitoring and maintenance requirements of the flocculation management practice. Section 8 details the water quality discharge monitoring programme, which describes the monitoring parameters, methods, trigger levels and reporting that needs to be implemented during chemical treatment.

1.3

Relevant Conditions

Table 1-1 identifies the resource consent conditions relevant to this FTMP and where they are addressed in the document. Table 1-1 Karangahape Station main works FTMP conditions and location in this plan

Condition No.

Condition

Relevant section of FTMP

Specific conditions – land use consent R/LUC/2016/1890 Flocculant treatment management plan 59

At least 20 working days prior to the commencement of construction, the Consent Holder shall submit to Council (Team Leader Central Monitoring) for certification an FTMP which confirms the measures that will be taken to ensure that the construction of the Project or Project Stage will be generally consistent with the Water Quality Assessment

CRL Regional Resource Consent approved by Auckland Council on 17 November 2016 Page 7 | Karangahape Station Main Works

This FTMP

Flocculant Treatment Management Plan

Condition No.

Condition

Relevant section of FTMP

and the Industrial and Trade Activities Assessment prepared by Golder Associates (NZ) Limited, both dated December 2016. 60

The Consent Holder shall request the Council's (Team Leader Central Monitoring) written determination as to whether the FTMP can be certified, in writing, within 10 working days of receipt of the FTMP.

Noted

No construction activity shall commence until certification from Council is provided. 61

The FTMP shall include, but not be limited to, the following matters:

3, 4, 5, 6 and 8

• Specific design details of the flocculent treatment system based on a batch dosing methodology for the site's settlement tanks, including the potential for use of non -chemical flocculants (e.g. chitin based flocculants); • Monitoring, maintenance (including post-storm) and contingency programme (including a record sheet); • Details of optimum dosage (including assumptions); • Results of initial flocculent treatment trial; • A spill contingency plan; and • Details of the person or bodies who will hold responsibility for the long-term operation and maintenance of the flocculent treatment system and the organisational structure which will support this system. 62

Any change to an FTMP shall be submitted to the Council (Team Leader Central Monitoring) for certification.

1.5

The Consent Holder shall request the Council's (Team Leader Central Monitoring) written determination as to whether the proposed change can be certified, to be provided within 10 working days of submission of the change. No activity reliant upon a change to the FTMP can be undertaken until the change has been certified.

Noted

The Consent Holder shall comply with the ESCP for the duration of the earthworks associated with the Project.

Noted

As Built Certification General Performance Standards The Consent Holder shall ensure that the erosion and sediment control measures are constructed and maintained in accordance with GD05, except where a higher standard is detailed in an ESCP/FTMP, in which case the higher standard shall apply.

3.1 (and ESCP)

Specific conditions – discharge permit (contaminated land) R/REG/2016/1895 and land use consent R/LUC/2016/1890 (Contaminated Land and Resource Management (National Environmental Standard for Assessing and Managing Contaminants in Soil to Protect Human Health) Regulations 2011) Contaminated Soils Management Plan 144

Page 8

The Consent Holder shall implement the procedures for the management, treatment, temporary containment, testing, and disposal of groundwater and surface run-off water via the stormwater system in accordance with the report titled Auckland City Rail Link: Resource Consent Package 2: Aotea Station to North Auckland Line Construction

| Karangahape Station Main Works

0, 7, 8 (and ESCP)

Flocculant Treatment Management Plan

Condition No.

Condition

Relevant section of FTMP

and CRL Operation: Draft Erosion & Sediment Control Management Plan, dated 13 May 2016, prepared by Aurecon New Zealand Limited, and provided with the application. 145

Any perched groundwater, or surface run-off water, encountered within the excavation area requiring removal shall be considered as potentially contaminated, and shall either: a. be disposed of by a licensed liquid waste contractor; or b. pumped to sewer, providing relevant permits are obtained; or c. discharged to the stormwater system, provided testing demonstrates compliance with 50 times the Australian and New Zealand Environment Conservation Council (ANZECC) Guidelines for Fresh and Marine Water Quality (2000) for the protection of 95 percent of marine water species, and is free from petroleum hydrocarbons.

3.2 and 3.6 (and Industrial and Trade Activities Environmental Management Plan - ITA EMP)

Specific conditions – discharge permit (other) R/REG/2016/1896 and discharge permit (ITA) R/REG/2016/1898 (CONSTRUCTION) Structural Controls 169

Noted

174

The water quality monitoring programme shall include, but not be limited to:

a. Sampling locations (to include the final discharge from the treatment system located in CSA 1, CSA 2, CSA 3, CSA 5 and CSA 4); b. Methods and procedures for discharge sampling; and c. Monitoring parameters for analysis, which shall include: Daily • Water clarity (black disc) cm • Turbidity (NTU) • pH Weekly (in addition to the above) • Total Suspended Solids g/m3 • Total recoverable copper g/m3 • Dissolved copper g/m3 • Total recoverable zinc g/m3 • Dissolved zinc g/m3 • Total petroleum hydrocarbons g/m3 Page 9

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Flocculant Treatment Management Plan

Condition No.

Condition

Relevant section of FTMP

â€˘ Ammoniacal nitrogen* g/m â€˘ Nitrate nitrogen* g/m3 *Applicable only in discharge from treatment systems in CSA 3 and CSA 4, not applicable to Beresford Square (CSA 2) 3

d. identified trigger levels for each of the above parameters. These trigger levels shall be developed with reference to the ANZECC Guidelines for water quality where applicable; and e. the methods and procedures for investigating and reporting stormwater discharge monitoring results to the Council (Team Leader Central Monitoring). 175

The discharge monitoring programme shall be implemented upon completion of works set out in Condition 168.

8 and 8.3

176

Within five working days of receipt of sample results showing contaminants exceeding the agreed trigger levels in Condition 174(d):

8.5.2

8.5.1

179

For the duration of the construction stages of the Project, the Consent Holder shall forward a report annually from the date of granting of this consent to the Council (Team Leader Central Monitoring) evaluating the siteâ€™s environmental performance for the year to date.

8.5.3 (as well as

The Annual Report required by Condition 178 shall include but not be limited to:

8.5.3

a. all aspects of the performance of the EMP relating to this consent; b. a summary of all revisions and revised sections of the EMP; c. details of all inspections and maintenance of the stormwater system for the preceding 12 months; d. details of and changes to the person(s) or body responsible for the maintenance of site and the organisational structure supporting this process; Page 10

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CEMP and ITA EMP)

(as well as CEMP and ITA EMP)

Flocculant Treatment Management Plan

Condition No.

Condition

Relevant section of FTMP

e. results and analysis of the preceding 12 months of stormwater monitoring, along with an interpretation of those results and suggestions for improvement to the site operations; and f. records of any spills or incidents which occurred within the previous 12 months and the response which was undertaken.

1.4

Sustainability

The Link Alliance is seeking an Infrastructure Sustainability Council of Australia (ISCA) Infrastructure Sustainability (IS) Rating. Further details can be found in the CEMP and Sustainability Management Plan. Project sustainability requirements that relate directly to this FTMP are included in Appendix A of this FTMP. These requirements are imbedded within this FTMP to ensure that sustainability is a key focus and ‘the way we do things’. In some cases, the IS requirements and sustainability goals enhance the designation and consent requirements. Further detail on sustainability is provided in section 1.7 of the CEMP.

1.5

FTMP Review and updates

This FTMP is a live document that will be reviewed at least annually, or: • • • •

As a result of a material change to the project, or To address unforeseen water treatment of the groundwater and stormwater arising from construction, or If potential flocculants and coagulants are likely to be used (additional to the one described in the current version of this FTMP), or As a result of unresolved complaints in the project area.

Any material changes to this FTMP must be certified by Auckland Council prior to any on-site activity reliant upon the change commencing (as per conditions 62 and 63 of the CRL Regional resource consent). Refer to the CEMP for further detail on the review and updating process of the Plans.

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Flocculant Treatment Management Plan

Karangahape Main Works 2.1 Overview of Works

The Karangahape Station main works, including the layout of CSAs and ACZs, are summarised in the ESCP and described in detail in the CEMP.

2.2 Construction Support Areas The Karangahape main works will be undertaken across two distinct CSAs at Mercury Lane and Beresford Square. Further detail is provided in section 2.6 of the CEMP and a summary of the key indicative plant and activities within each CSA provided below. Mercury Lane CSA: • • • •

• • • •

•

Beresford Square CSA: • • •

• •

Bentonite plant (southern portion of the CSA – near the site offices); Storage area for general and hazardous materials (including bentonite and polymer storage); Specifically designated water treatment area to treat dirty runoff (likely located at the eastern end of the ACZ, at the intersection with Beresford Square and Pitt Street), water from within excavations, D-wall water and water from concrete wash-off and runoff collected within the bunds of high risk spillage areas (i.e. bentonite plant); Temporary storage area for materials (rocks, grit and sand) removed by the bentonite desander; and Entrance/exit to CSA for trucks (with stabilised entry and exit). Exit will have a cattle grid over a concrete channel and a wheel wash. Water will drain to a manhole nominally 1.5m deep and be pumped to the water treatment area or a tanker truck.

2.3 Active Construction Zone The Karangahape Station main works will be undertaken through work zones referred to as Active Construction Zones (ACZ), in accordance with resource consent. Each CSA supports an ACZ where the station shaft excavations will occur. At Mercury Lane, the ACZ is located within the CSA, while at Page 12

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Flocculant Treatment Management Plan Beresford Square the ACZ is located adjacent to the CSA. Further detail is provided in the CEMP. Erosion and sediment generation is expected to occur throughout the ACZs during the main works.

2.4 Construction Methodology and Programme Further detail of the construction methodology and programme of the Karangahape Station main works is provided in section 2.2 and 2.4 of the CEMP.

Chemical Treatment System Details 3.1 Standards and guidelines documents

The coagulant and flocculant treatment (commonly referred to as flocculation) will be designed, operated and maintained in accordance with Section F2.0 – Coagulant and Flocculant Treatment of Auckland Council Guideline Document 2016/005 (GD05)2 and Auckland Council’s Technical Publication TP227 “The Use of Flocculants and Coagulants to Aid the Settlement of Suspended Sediment in Earthworks Runoff: Trials, Methodology and Design”3.

3.2 Water Treatment Devices Chemical treatment is expected to be used at water treatment areas within sediment retention devices and/or water treatment systems specified in the ESCP. The sediment-laden runoff from the excavations will be generally pumped (or sent via rising main at Beresford Square) into the sediment retention devices which will provide simple settlement by default. If simple settlement does not provide the required water discharge quality4 as specified in section 8.4 of this FTMP (in accordance with resource consent condition 145c), then assisted settlement via flocculation, lamella clarification and/or ultrafiltration (or a combination of all) may be required. Assisted settlement decreases the settlement time by increasing the sediment removal efficiency of the sediment retention devices, therefore, the use of flocculation treatment is to be investigated for all sediment retention devices on site. The following scenarios are where flocculation treatment may not be required: • •

Bench testing of soils in the contributing catchment confirms there is no benefit from flocculation, or The duration of the earthworks is very short.

The details of the specific ESC measures including the sediment retention devices to be utilised in each works area are detailed within the ESCP (and depicted in the ESCP drawing attached as Appendix C of the ESCP).

Erosion and Sediment Control Guide for Land Disturbing Activities in the Auckland Region – Guideline document 2016/005 (GD05), Auckland Council, June 2015 3 Auckland Council’s Technical Publication TP227 – The Use of Flocculants and Coagulants to Aid the Settlement of Suspended Sediment in Earthworks Runoff: Trials, Methodology and Design, Auckland Council, June 2014 4 The required groundwater and surface run-off quality to be discharged to stormwater is defined as per resource consent condition 145c, i.e. provided testing demonstrates compliance with 50 times the Australian and New Zealand Environment Conservation Council (ANZECC) Guidelines for Fresh and Marine Water Quality (2000) for the protection of 95 percent of marine water species, and is free from petroleum hydrocarbons. Section 8.4 of this FTMP provides detail about discharge quality monitoring and trigger levels. Page 13 | Karangahape Station Main Works

Flocculant Treatment Management Plan Indicative locations of the proposed water treatment systems are (refer to the ESCP drawings attached in Appendix C of the ESCP): â€˘ â€˘

Page 14

On the eastern end of the ACZ of the Beresford Square CSA (CSA2). Within the southern section of the Mercury Lane CSA (CSA3).

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Flocculant Treatment Management Plan

3.2.1. Water treatment technologies Due to the fact that water generated on site will include groundwater from excavations, simple settlement and flocculation treatment may not suffice. In this case primary treatment in the form of pH adjustment and the use of flocculants may need to be followed by secondary treatment (such as ultrafiltration or lamellar clarifiers) to ensure the water meets the water quality discharge standards (refer to section 8 of this FTMP). The requirement for secondary treatment will also be determined using bench testing of the site’s soils (refer to section 3.3 of this CEMP). Water treatment technology options are currently being discussed and assessed by the Link Alliance, in terms of water treatment efficiency, site conditions, water treatment system footprint, and costs. Examples of the main options that are being considered are listed below. Lamellar plate clarifiers Lamella plate clarifiers are often used in place of conventional settling tanks. They use a series of inclined plates that provide a large effective settling area for a small footprint (refer to example in Figure 3-1 ). They typically consist of a series of inclined plates inside a vessel. An example is the HB60 Siltbuster Lamella Plate Clarifier. This system makes use of flocculants and coagulants for treatment and uses semi-automated dosing. This system includes the following components: • • • • • • • •

Page 15

An inflow/buffer tank A flocculant injection and mixing system A lamella plate decantation vessel including a sludge hopper and connections for sludge pumping pH adjustment system Real time measure of pH and flow rates Automated valves to allow discharge to stormwater or trade waste Storage tank for reuse of treated water onsite Control room with automat, control screen, data logger.

| Karangahape Station Main Works

Flocculant Treatment Management Plan

Figure 3-1 Example of an illustration of lamella plate clarifier (source: www.siltbuster.com)

Ultrafiltration Ultrafiltration is a variety of membrane filtration in which pressure and concentration gradients lead to a separation through a semipermeable membrane. Suspended solids are retained in the retentate (part of the feed that does not pass through the membrane and is retained), while water and low molecular weight solutes pass through the membrane in the permeate. An example of an ultrafiltration water treatment system is provided in Figure 3-2. This system uses an ‘outside-in’ filtration approach for the ultrafiltration membrane elements. The dirty water is pumped around the bundle of hollow fibre membranes. This method only needs coarse pre-screening compared to ‘inside out’ membranes that have to protect solids getting into the centre of hollow fibres. This system includes the following components: • • • • • • Page 16

Feed silo Reaction tank (used for pH correction) Control room Pump room Product tank Back wash return tank | Karangahape Station Main Works

Flocculant Treatment Management Plan • • • • • •

Ultrafiltration feed tank Filter press Ultrafiltration system Acid bund Caustic bund Sludge holding silo.

Figure 3-2 Example of an ultrafiltration plant (Source: https://www.makwater.com.au/products/ultrafiltration)

3.3 Soil Testing Prior to bulk earthworks (subgrade level) commencing within the catchment of a settlement device, a ‘bench test’ will be undertaken to assess the effectiveness and type of chemical treatment appropriate for the site’s soils. The bench test involves collecting a sample of the earthworks site’s soils, mixing it with water in a clear cylinder and measuring the settling time of the suspended sediment. Soil samples will be taken and tested with a variety of flocculants and coagulants to determine reactivity and subsequent improvement in settlement efficiencies. At regular intervals (10 minutes, 30 minutes and 60 minutes), the depth of clarity is measured in each sample to determine which dosage of chemical provides the greatest level of settlement.

Figure 3-3 Example of Bench Testing (Source: GD05)

The output of the bench testing is the optimal amount of chemical (mg) to be applied per unit volume of sediment-laden runoff (L), known as the dose (mg/L). The concentration derived from the bench testing is used on site to calibrate the dose rate, which is site specific and dependant on rate and concentration of sediment-laden runoff from the site. The test procedure is further detailed in section 3.3.1 of this FTMP. A bench test is required in the following circumstances: • • Page 17

For each representative soil type in the catchment contributing to a sediment retention device; Any time batch-dosing is required; | Karangahape Station Main Works

Flocculant Treatment Management Plan • •

Any time chemical treatment is to be considered; Whenever previous chemical treatment is no longer providing adequate results.

Limitations of bench testing include: •

• • •

pH must be tested as part of the bench testing and should be used as a control baseline, any flocculant that is used must not change that baseline pH to beyond +/- 1, and must not fall outside of the pH range 5 – 9. Treatment should cease when the above pH limits cannot be met (when using Polyaluminium Chloride (PAC)). Treatment requires a high degree of monitoring and maintenance. In significant rainfall events (>15mm in 24 hours), the dosing rate needs to be carefully monitored so that the system does not run out of reagent.

3.3.1. Test Procedure Appendix F1.0 of GD05 outlines the required Bench Testing Methodology that will be used to determine the most appropriate dosage rate. The methodology is based on liquid PAC and not applicable to solid flocculants, for advice on testing and using solid flocculants please contact Auckland Council. A summary of GD052 bench testing methodology is provided below: 1. Collect a soil sample that is representative of the catchment soil. 2. Testing is undertaken by mixing a representative sample of soil from the site with water to produce a weak slurry, representative of sediment laden runoff from the site. 3. Samples of this are then taken and placed in clear jars along with an additional reference sample. 4. Potential chemical additives are then added at varying concentrations (where appropriate). 5. At regular intervals (0 minutes, 30 minutes and 60 minutes), the depth of clarity is measured in each sample to determine which dosage of chemical provides the greatest level of settlement. 6. The pH of each sample is also measured after 60 minutes to ensure that this remains within the required limits of 5 – 9. 7. The turbidity of each sample is also measured after 60 minutes. 8. The most effective dosage rate is compared with the reference sample to assess whether chemical treatment is effective. 9. The appropriate dosage rate is then used to calculate the sizes of the various components of the rainfall activated treatment devices.

3.4 Potential Flocculants and Coagulants A number of potential flocculants and coagulants are available, however experience with the typical soils in the area indicate that the greatest increases in efficiency will be provided by either of: • • • •

Page 18

Polyaluminium Chloride (PAC) – most commonly used coagulant in NZ PolyDADMAC EC20 (80% PAC / 20% PolyDADMAC) Acid (such as Hydrochloric acid (HCl), citric acid or a similar product), or CO2 injection to reduce pH. | Karangahape Station Main Works

Flocculant Treatment Management Plan When initial testing is undertaken, an assessment will also be made to determine if the use of nonchemical (i.e. organic) flocculants (e.g. chitin based) will provide suitable increases in efficiency. Note that PAC is the only product that went through rigorous testing by Auckland Council, and that use of other chemicals may require specific approval from Auckland Council. The use of flocculants and coagulants in addition to PAC or PolyDADMAC products can be updated as industry experience advances or if more environmentally friendly options (i.e. organic flocculants) are proposed. However, they can only be utilised upon a revision of this FTMP which will follow the review process described in section 1.5 of this FTMP. Revisions of the FTMP will identify the chemicals, the dosing procedures and testing and sampling proposed to ensure that residual chemicals are monitored and within acceptable limits.

3.5 Dosing Options The following forms of dosing/treatment are expected to be used where assisted settlement is required by way of either automated dosing and/or manual dosing. Dosing types and details are provided in the Table 3-1. Table 3-1 Karangahape Station main works dosing options

Dosing type Automated dosing treatment (see Figure 3-4 for an example of a typical system flow chart)

Manual dosing treatment

Description • Fully automated dosing system. • Uses telemetry to monitor and record live updates to maintain pH levels and turbidity on site. • A flow-activated dosing pump which uses coagulants and flocculants to allow for settlement which segregates solids from liquid. • The whole process is monitored through an automatic pH controller. • Recirculation system for re-treatment where the required water quality discharge standard cannot be met. • Manual dosing system. • Typically undertaken to treat an impounded volume of sedimentladen runoff (i.e. a tank or a pond), typically as a result of pumping. • Process where the volume of impounded water is determined and from this the appropriate volume of additive determined, added and mixed. • Process can be used where automated dosing treatment cannot achieve the required water quality discharge standard4.

The sampling and testing of soils previously detailed in section 3.3 of this FTMP will be utilised to determine the appropriate chemical and dose rate for the Karangahape Station main works. Both dosing treatment types can be used for flocculation treatment and pH adjustment. The dose rate to buffer the pH, and the pH monitoring will be determined by either manual methods (e.g. pH strips) or by a pH sensor, which will sample water within the settlement tank and will be adjusted by the operator as required.

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Flocculant Treatment Management Plan Figure 3-4 shows a typical example of an automated dosing treatment unit (not tailored to specific treatment to CSA2 or CSA3). Manual and/or automated dosing systems at Beresford Square and Mercury Lane sites will be assessed by the Karangahape Station Construction team, in terms of water treatment efficiency, site conditions, water treatment system footprint, and costs.

Figure 3-4 Example of a typical automated dosing treatment unit (Source: Green Technologies Ltd) – not tailored to water treatment specific at Beresford Square or Mercury Lane.

3.6 Chemical Treatment Performance The sediment retention/water treatment devices are expected to achieve required water discharge quality4 of treated water into the receiving environment, in accordance with resource consent condition 145.c. (refer section 8.4 of this FTMP for further detail). In the event that the water discharge quality does not meet the standard required, the following contingency measures will be initiated: • • • •

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The water discharge will be recirculated through the water treatment system for further treatment, including manual chemical dosing if required; If excessive water enters the work area during heavy rainfall, the water may be temporarily held within the excavation area until it is processed by a water treatment system; Treated water will be discharged to stormwater if it meets the stormwater discharge quality4;; If the stormwater discharge quality4 is not achieved to enable discharge to stormwater, but falls within the limits of the trade waste consent to be agreed with Watercare (limits will include a number of parameters such as discharge volumes, concentrations, flow rates), then water will be discharged to trade waste. | Karangahape Station Main Works

Flocculant Treatment Management Plan • •

If trade waste consent requirements are not satisfied, then the water will be disposed of by a licenced liquid waste contractor, in accordance with resource consent condition 145 (a). Vacuum trucks will be deployed to convey excess or substandard quality water off-site.

There may be considerations to provide temporary storage tank as part of the water treatment systems.

Storage and Handling of Chemicals

The water treatment chemicals will be stored within a bunded enclosure in the vicinity of the water treatment system in order to contain any spillage or failure of container vessels or pipe connections. The storage and monitoring of the chemicals used as part of the water treatment system will be undertaken by trained personnel in accordance with the requirements of the Industrial and Trade Activities Environmental Management Plan (ITA EMP) attached in Appendix J of the CEMP. These personnel are listed in section 6 of this FTMP. All chemicals and volumes of chemicals used on site will be recorded and maintained in a Hazardous Substances register.

Emergency and Spillage

Chemical substances will be mainly in liquid form, should the use of chemical treatment be required during the Karangahape Station main works. A general Emergency Spill Response Plan (ESRP) has been developed to set out the project spill management procedures (refer to Appendix C of the ITA EMP). A specific Bentonite ESRP will also be prepared (for bentonite plants at both CSAs) prior to the start of the main works (refer Appendix D of the ITA EMP).

Responsibility for Operation, Maintenance and Monitoring

The Karangahape Station Construction Manager, Mined Tunnel Manager and the Karangahape Station Environmental Advisor will be responsible for the implementation of the FTMP, as outlined in Table 6-1. Responsibilities include in particular the operation and maintenance of the treatment system and water quality monitoring. This table needs to be read in conjunction with the roles and responsibilities outlined in section 4.1 of the CEMP. Table 6-1 Responsibilities for implementation of the FTMP

Role • Karangahape Station Project Manager

Responsibility • Ensures site personnel adhere to the CEMP and sub-plans (including FTMP) and comply with environmental operating procedures.

• Karangahape Station Construction Manager • Mined Tunnel Manager • Karangahape Station Environmental Advisor

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• Ensures site personnel adhere to the CEMP and sub-plans (including FTMP) and comply with environmental operating procedures, in relation to mined tunnel water. • Develops, implements and reviews environmental management systems including the FTMP.

Flocculant Treatment Management Plan (with support from FTMP Subject Matter Expert)

• Beresford Square Project and Site Engineers

• Mercury Lane Project and Site Engineers

• Treatment plant operator • Treatment Unit Supplier personnel • Suppliers / Subcontractors

• Oversees the water quality discharge monitoring and that sampling is carried out as per sampling protocol. • Reviews water quality monitoring results, investigates and reports to Auckland Council any non-compliances. • Provides on-site compliance with resource consent conditions and other requirements (such as trade waste consent if applicable) and ensure site compliance. • Undertakes regular site inspections and audits to ensure compliance with the CEMP and sub-plans, including the FTMP and consent conditions. • Implements (or supervises subcontractors to ensure implementation of) environmental controls in accordance with the contract, CEMP and sub-plans including FTMP. • Ensures environmental erosion and sediment control works are installed and maintained as per ESCP/FTMP and supplier’s technical specifications. • Manages maintenance and operation of the water treatment system. • Inspects works (such as operation and maintenance of the sediment retention devices and the water treatment system) to assess compliance with the FTMP and other sub-plans. • Implements (or supervises subcontractors to ensure implementation of) environmental controls in accordance with the contract, CEMP and sub-plans including FTMP. • Ensures environmental erosion and sediment control works are installed and maintained as per ESCP/FTMP and supplier’s technical specifications. • Manages maintenance and operation of the water treatment system. • Inspects works (such as operation and maintenance of the sediment retention devices and the water treatment system) to assess compliance with the FTMP and other sub-plans. • Is responsible for the implementation of the water quality discharge monitoring programme.

• Undertakes test procedure and bench testing for use of flocculant at the water treatment system.

Inspection and Maintenance

The inspection and maintenance actions specific to the water treatment/flocculation management practices are required to be undertaken at specific frequencies, as specified in Table 7-1. This table needs to be read in conjunction with section 3.3 of the ESCP, which details the inspection and maintenance procedures of the ESC measures.

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Flocculant Treatment Management Plan Table 7-1 Inspection and maintenance of the water treatment system

Water treatment system Inspection and Maintenance Actions

Inspection and Maintenance Actions Requirements

Frequency

Seven day weather forecast

•

Works will be programmed in accordance with weather predictions (refer Metservice 3 Day rain forecast and 7 days weather forecast).

Daily

Sediment retention device (without chemical treatment)

•

Check if the device is full, and transport sediment-laden runoff to the water treatment system when the tank is nearly full. Monitor frequently to check if the tanks are sized properly, and upgrade if required.

Weekly and after rainfall

Check quantity of coagulants/flocculants that remains in the system – top up the device with more coagulants/flocculants as required. All hoses, connections etc. will be checked to ensure they are working effectively and that there is no leakage. Accumulated sediment should be cleaned out regularly. pH5 of the water treatment system to be monitored daily (refer section 8.3.1) Any changes in degree of stabilisation of the construction site.

Weekly and after rainfall, and when site will be left unattended for more than 48 hours.

Check plant for any alarms. Check that all pumps are primed and operating correctly. Check chemical tank levels. Check and clean pH probes. Check water is flowing through pH and turbidity sample line. Check pH and turbidity levels are within the desired control range. Change and clean bag pre-filters as required. Visually check product water flow and turbidity. Check and empty filter press sludge bin as necessary. Check solids levels in feed silo. Check for oil on the surface of feed silo. Fill in log sheet.

Daily

Weekly

•

Manually compare the discharge pH (via portable meter or papers) to that on the pH Controller.

• • •

Calibrate pH meters. Calibrate turbidity meter. Check that all pump connections are tight.

Monthly

• Water treatment device/system (using pH adjustment, and/or flocculants)

•

• • • Other treatment system such as Ultrafiltration

• • • • • • • • • • • • •

Note: frequency of this testing may be increased during extended periods of heavy rainfall.

If the pH levels fall outside the range 5 – 9, the Environmental Advisor will determine appropriate actions which could include decommissioning the flocculation unit or adding alternate chemicals, such as sodium carbonate or sodium bisulphate, to alter the pH. Page 23 | Karangahape Station Main Works

Flocculant Treatment Management Plan Water treatment system Inspection and Maintenance Actions

Inspection and Maintenance Actions Requirements

Frequency

• •

Grease cartridge bearing on stirrers. Change desiccant bag in turbidity monitor.

Three monthly

•

Complete system clean down and inspection for damage and corrosion. Change gear oil on stirrers. Calibrated discharge flowmeter. Replace diaphragm and “O” rings in dosing pumps.

Annually

• • • Soil testing (bench testing)

•

Bench test to determine whether chemical treatment is required, and inform decision for treatment system option.

As required, refer to section 3.3

Application of Chemical treatment

•

If assisted settlement is required using nonchemical or chemical coagulants/flocculants, monitoring of dosing rates will be required. Water clarity and turbidity monitoring and maintenance through telemetry/live updates (or manually, depending on the method chosen, refer to section 3.5).

Daily and after rainfall

•

In addition to the inspection and maintenance actions, discharge monitoring will be undertaken as per the Water Quality Discharge Monitoring Programme (refer section 8 of this FTMP). The results of the daily and weekly sampling will be retained for inspection/review as required.

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Flocculant Treatment Management Plan

Water Quality Discharge Monitoring Programme

A Water Quality Discharge Monitoring Programme (WQDMP) has been prepared in accordance with the requirements of resource consent condition 1741 to provide framework of stormwater discharge monitoring locations, parameters, trigger levels and reporting. It is based on the 2016 Water Quality Assessment Golder Report6 and the ANZECC (2000) guidelines7 where applicable.

8.1 Sampling Locations Typically, the daily and weekly sampling will be undertaken at the outlet of each sediment retention device or the water treatment system, prior to discharging to the stormwater network. Sampling will also be undertaken prior to discharge to trade waste (but this does not form part of the WQDMP).

8.2 Monitoring Parameters This section lists the parameters to be analysed as part of the WQDMP.

8.2.1. Daily Daily sampling and measurement will be made of: • • •

Water clarity Turbidity pH

(cm) (NTU)

8.2.2. Weekly Weekly sampling and measurement will be made of: • • • • • •

Total Suspended Solids (TSS) (g/m3) Total recoverable copper (g/m3) Dissolved copper (g/m3) Total recoverable zinc (g/m3) Dissolved zinc (g/m3) Total petroleum hydrocarbons (TPH) (g/m3).

A review of the weekly sampling parameters will be undertaken after eight weeks of sampling based on the testing results (refer section 8.5.1). The WQDMP will be amended accordingly.

8.3 Monitoring Methods This section details the monitoring methods as part of the WQDMP.

8.3.1. Daily The method of daily monitoring will depend on the sediment retention device or the water treatment system utilised.

Auckland City Rail Link A2N Water Quality Assessment, Golder Associates (NZ) Limited, May 2016. Australian and New Zealand Environment Conservation Council Guidelines for Fresh and Marine Water Quality (ANZECC 2000), amended 2018 Page 25 | Karangahape Station Main Works 7

Flocculant Treatment Management Plan For the majority of devices, the daily monitoring will be undertaken manually with a grab sample taken at the outlet. A summary of the daily monitoring methods is provided in Table 8-1. Automatic sampling methods/telemetry of the water treatment system may also be used. Table 8-1 Daily monitoring (manual) methods

Monitoring parameters Water Clarity

pH TPH Turbidity

Details Measured using a Secchi disc (30mm diameter) or a horizontal water clarity tube, record the depth to the nearest 5mm, to which the disc is no longer visible in the water. Calibrated pH probe. Visual check if presence of conspicuous oil or grease film, sheen or odour. Calibrated turbidity meter.

This monitoring will be recorded on daily record sheets detailing the following information: •

• • • • • •

Visual check of influent and effluent if presence/absence visible TPH (e.g. conspicuous oil or grease film, sheen or odour), flocculant type and volume used, dosing system operation details; Water clarity monitoring; Turbidity monitoring; pH monitoring; Record any notes for maintenance or additional information (e.g. ordering additional flocculant supplies); Record of daily volume of chemicals used; and Record of daily volume of sediment-laden runoff treated.

Following the evaluation of water quality samples collected over the one-month period, the frequency of sampling and parameters analysed will be reviewed and the monitoring programme amended if required.

8.3.2. Weekly Weekly sampling will be undertaken by retrieving a sample(s) of outflows from the lowest stormwater manhole within or immediately below the construction area or CSA. The parameters listed in section 8.2.2 will be analysed for by an accredited laboratory. The treated water samples will be collected on a weekly basis for eight weeks for analysis of water quality. Following the evaluation of water quality samples collected over the eight weeks period, the frequency of sampling and parameters analysed will be reviewed and the monitoring programme amended if required.

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Flocculant Treatment Management Plan

8.4 Trigger Levels The initial trigger levels for discharges from the site are provided in the following sections for both daily and weekly monitoring. Process to review trigger levels is also detailed in those sections.

8.4.1. Daily Parameters Trigger Levels Trigger values are provided in the Table 8-2. The initial trigger values are taken from GD052. Soil testing will inform trigger level value to be set for water clarity and turbidity of daily samples. A review of the initial trigger values will be undertaken after one month of sampling based on the results of soil testing. Table 8-2 Daily monitoring trigger levels

Chemical / Parameter Water clarity

pH TPH Turbidity

Initial Trigger Value

Notes

Water clarity of 10cm or greater measured with a Secchi disc / horizontal water clarity tube. Between 5 and 9 No visible TPH (sheen or odour) Between 2,000 â€“ 3,000 NTU (From GD052)

Soil testing will inform trigger level value to be set for water clarity of daily samples.

Soil testing will inform trigger level value to be set for turbidity of daily samples.

8.4.2. Weekly Parameters The initial trigger values for the weekly parameters are taken from the 2016 Water Quality Assessment Golder Report6. For the Mercury Lane CSA, these trigger values took into account dilution within the receiving environment, being Motions Creek. Specifically, the 2016 Water Quality Assessment Golder Report states that the trigger levels for discharges from the CSA3 are 25 times the ANZECC(2000)7 guideline values of 95% level of protection (LOP) for freshwater species during low flow (i.e. up to 25 L/s) and 100 times the ANZECC(2000)7 guideline values of 95% LOP for freshwater species during flows greater than low flow (i.e. greater than 25L/s). A summary of the weekly monitoring trigger levels for Mercury Lane is provided in Table 8-3. The Beresford Square CSA discharge trigger levels are based on a 50 dilution factor times the ANZECC(2000)7 guideline values of 95% LOP for marine species (Waitemata Harbour being the receiving environment). A summary of the weekly monitoring trigger levels for Beresford Square is provided in Table 8-4. After eight weeks of sampling being undertaken, a review of the sampling programme will be carried out for Mercury Lane and Beresford Square and will encompass review of parameters, trigger levels and frequency, and the WQDMP will be amended accordingly where necessary. The review will be summarised in a report submitted to Auckland Council (refer section 8.5.1 of this FTMP).

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Flocculant Treatment Management Plan Table 8-3 Weekly monitoring trigger values Mercury Lane CSA

Chemical / Parameter

ANZECC (2000) 95% LOP freshwater species

Initial Trigger Value (Mercury Lane Catchment)* Low flow Flows>low (25L/s at flow Motions Creek) 50 g/m3 for 50 g/m3 for 95% of 95% of samples samples

TSS

Total Recoverable/Dissolved Copper Total Recoverable/ Dissolved Zinc TPH

0.0014 g/m3

0.035 g/m3

0.14 g/m3

0.008 g/m3

0.2 g/m3

0.8 g/m3

15 g/m3

Nutrients Ammoniacal Nitrogen (annual median)

Initial Trigger Value >0.03 and ≤0.24 g/m3

Notes

Concentrations are managed with a goal of being less than 20 g/m3 for half of the samples. 25 and 100 times ANZECC 95% Freshwater 25&100 x ANZECC 95% Freshwater ARCTP108

Notes MfE (2018)9, Attribute State B

Ammoniacal Nitrogen >1.25 and ≤10 g/m3 MfE (2018)9, Attribute State B (annual maximum) 25x dilution (low flow) for annual maximum Nitrate Nitrogen >1 and ≤2.4 g/m3 MfE (2018)9, Attribute State B (annual median) Nitrate Nitrogen >37.5 and ≤87.5 g/m3 MfE (2018)9, Attribute State B th (annual 95 25x dilution (low flow) for annual 95th percentile) percentile * Trigger levels for heavy metals are based on Golder (2016) and in accordance with resource consent condition 145.c

Auckland Regional Council Stormwater management devices: Design guidelines manual 2003 Ministry for the Environment (MfE). 2014 and updated 2018. A Guide to Attributes In Appendix 2 of the National Policy Statement for Freshwater Management (as amended 2017). Wellington: Ministry for the Environment. Page 28 | Karangahape Station Main Works 9

Flocculant Treatment Management Plan Table 8-4 Weekly monitoring trigger values Beresford Square CSA

Chemical / Parameter

ANZECC (2000) 95% level of protection for marine species

Initial Trigger Value (Beresford Square Catchment)*

Notes

TSS

50 g/ m3 for 95% of samples

Concentrations are managed with a goal of being less than 20 g/m3 for half of the samples. 50 x ANZECC 95%LOP Freshwater (50 times dilution expected)

Total Recoverable 0.0013 g/m3 0.065 g/m3 / Dissolved Copper Total Recoverable 0.015 g/m3 0.75 g/m3 / Dissolved Zinc TPH NA 15 g/m3 ARCTP1010 * Trigger levels for heavy metals are based on Golder (2016) and in accordance with resource consent condition 145.c.

8.5 Monitoring reports 8.5.1. Initial monitoring report Following eight weeks of monitoring commencing for the Karangahape Station main works, an initial report will be prepared and provided to Auckland Council (Team Leader Central Monitoring), outlining: • • • •

A summary of the monitoring results to date; An interpretation of those results and suggestions for improvement to the site operations where required; A programme for ongoing monitoring including the reporting of results (i.e. any changes to the monitoring programme described in sections 8.1 to 8.5 of this FTMP); and Water treatment system maintenance programme (refer section 7 of this FTMP).

8.5.2. Non-conforming result report Monitoring results will be reviewed at least weekly for analysis of any non-compliances. Within five working days of receipt of sample results showing contaminants exceeding the trigger levels set out in section 8.4 of this FTMP, the following contingency measures will be implemented: • •

An investigation will be undertaken to determine why exceedances were detected and to identify any additional source controls or treatment required; and The results of this investigation will be sent in a report format to Auckland Council (Team Leader Central Monitoring).

Auckland Regional Council Stormwater management devices: Design guidelines manual 2003 Page 29 | Karangahape Station Main Works

Flocculant Treatment Management Plan

8.5.3. Annual monitoring reports An annual report (encompassing CEMP, ITA EMP and FTMP) will be prepared and submitted to Auckland Council (Team Leader Central Monitoring), combining the management plans annual performance and detailing: • • • • • •

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All aspects of the performance of the EMP relating to this consent; A summary of all revisions and revised sections of the EMP; Details of all inspections and maintenance of the stormwater system for the preceding 12 months; Details of and changes to the person(s) or body responsible for the maintenance of site and the organisational structure supporting this process; Results and analysis of the preceding 12 months of stormwater monitoring, along with an interpretation of those results and suggestions for improvement to the site operations; and Records of any spills or incidents which occurred within the previous 12 months and the response which was undertaken.

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Flocculant Treatment Management Plan

Appendix A: ISCA Requirements Table A identifies the ISCA Credit Requirements relevant to this FTMP and where they are addressed in the FTMP. Further details regarding the specifics of the evaluation and means of achieving the relevant targets is provided in the relevant sub-plans and other relevant documents. Table A: ISCA Requirements Credit

Requirement *

Relevant section of the FTMP

Other Relevant Information / Comments

Receiving Water Quality DIS-1 Level 1

Section 8 (and the ESCP)

Also refer to the Emergency Spill Response Plan, Contamination Delivery Work Plan, Groundwater and Settlement Monitoring and Contingency Plan, Industrial Trade and Activities Environmental Management Plan.

DIS-3 Level 3

Opportunities to improve receiving wai environmental values have been identified and implemented. Monitoring and modelling demonstrates improvement of receiving wai environmental values

Section 8 (and the ESCP)

Also refer to the Sustainability Management Plan, Industrial Trade and Activities Environmental Management Plan.

* Refer to ISCA Rating Tool for full details of the requirement

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Flocculant Treatment Management Plan

Appendix B: Record of CLG Comments CLG A Karangahape CLG meeting was held on 12th November 2019 to discuss the Karangahape Station main works and for the CLG to provide comments / feedback on the CEMP and sub-plans. No comments were received in relation to the ESCP or this FTMP.

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