Environmental Management Plan for Construction

Transcription

1 Environmental Management Plan for Construction NZ Prepared for Jagger NZ Ltd. 8 September September 2015 Cardno i

2 Contact Information Cardno Ltd Level 5 IBM Building, 25 Victoria Street, Petone, Lower Hutt 5012 PO Box , Wellington Mail Centre, Lower Hutt 5045 Telephone: International: dion.mead@cardno.co.nz Document Information Prepared for Project Name File Reference Job Reference Jagger NZ Ltd. NZ CI-RP001 Construction Management Plan.docx NZ Date 8 September 2015 Version Number 1 Author(s): Name: Bradley Blucher Job title: Engineer Effective Date 03 July 2015 Approved By: Name; Ray O Callaghan Job title: Senior Principal Date Approved: 03 July 2015 Document History Version Effective Date Description of Revision Prepared by: Reviewed by: 1 03/07/2015 Resource Consent application Bradley Blucher Dion Mead 2 27/08/2015 Amendments to Bridge Construction Plan Bradley Blucher Ray O Callaghan Cardno. Copyright in the whole and every part of this document belongs to Cardno and may not be used, sold, transferred, copied or reproduced in whole or in part in any manner or form or in or on any media to any person other than by agreement with Cardno. This document is produced by Cardno solely for the benefit and use by the client in accordance with the terms of the engagement. Cardno does not and shall not assume any responsibility or liability whatsoever to any third party arising out of any use or reliance by any third party on the content of this document. 8 September 2015 Cardno ii

3 Table of Contents 1 Plan Scope 1 2 Environmental Objectives Earthworks Erosion and Sediment Control Flood Control Stormwater Quality Roading 2 3 Requirements Statutory Requirements Consent Requirements Greater Wellington Regional Council Applications Porirua City Council Consents Contractual Requirements 3 4 Project Management Plan Structure 4 5 Environmental Responsibilities of Staff 5 6 Pre-Construction Requirements Construction Activity plan Pre-Construction site Meeting Minimum notice of works prior to works commencing Certification of ESC devices Environmental Site Induction 8 7 During Construction Inspections, Monitoring and Reporting Daily Inspections Weekly Site Audits Inspection and Monitoring Schedule Reporting of Site Audits Complaints and Feedback Procedures Public Feedback 10 8 Amendments to the Plan 11 9 Emergency Response Procedure Emergency Contacts Reporting Procedures Environmental Impact and Risk Assessment Site Description Site limitations Site Hazards PCC Trunk Water Main Gas main and Electricity/Telecom Cables Pressurised Bulk Wastewater Main Gravity Bulk Wastewater Main Department of Conservation (DoC) Reserve Main Construction Activities Potential Adverse Effects 17 8 September 2015 Cardno iii

4 11.6 Erosion and Sediment Control Principals Dust and Odour Control Noise Control Cartage of Materials and Machinery Important Contractor Requirements Project Construction Programme 21 Earthworks Construction Plan (ECP) Stage Earthworks Construction Management Plan Scope Earthworks Description Purpose of Works Site Description Site Construction Access Hours of Operation General Health and Safety Provisions Discovery of Artefacts Programme and Methodology General Erosion and Sediment Controls Stabilised Construction Entrance Surface Roughening and Battering Heavy Rainfall Contingency Measures Isolation from Floodwaters Specific Erosion and Sediment Control Measures Sediment Retention Ponds (SRP) Pond Outlets & Discharge flow path Pond Emergency Spillway Silt Fences (SF) and Super Silt Fences (SSF) Runoff Channels/Diversion Bunds (RC) Clear Water Channels/Diversion Bunds (CW) Stormwater Pipes/Culverts Site Stabilisation Removal of Erosion and Sediment Controls Earthworked Areas Stabilisation Maintenance and Monitoring Erosion and Sediment Control Certification Plan Review and Amendments Maintenance of Erosion and Sediment Control Measures References 30 BRIDGE CONSTRUCTION PLAN (BCP) 31 2 Bridge Construction Management Plan Scope Permanent Bridges Description Construction Methodology Example Temporary Bridges Description Methodology 34 8 September 2015 Cardno iv

5 FLOCCULATION MANAGEMENT PLAN (FMP) 35 3 Flocculation Management Plan Introduction Design and Management Flocculant and Dosage Rate Implementation and Application of Flocculant Initial Testing Alternatives Environmental Triggers Monitoring and Maintenance Weekly Monitoring Rainfall Event Monitoring High rainfall contingency measures Decommissioning Health and Safety Sampling Flocculant Handling Chemical Spills Plan Review Persons Responsible Material Safety Data Sheets 42 Stream Diversion and Stream Works Plan 44 4 Stream Diversion and Stream Works Plan Introduction Stream Diversion Pre Diversion Diversion Post Diversion Stream Bank Remedial Works 45 Appendices Appendix A Drawing Set Appendix B Erosion and Sediement Control Calculations Appendix C Environmental Effects Register Appendix D Flocculation Management Plan updates Appendix E Pre Construction Check List Appendix F Erosion & Sediment Control Asbuilt documentation Appendix G Earthworks Construction Plan Variations 8 September 2015 Cardno v

6 1 Plan Scope This Environmental Management Plan for Construction (EMPC) has been prepared for the development for Duck Creek North at Whitby, Porirua. The EMPC, by Cardno (NZ) Ltd on behalf of Jagger NZ Ltd. is to be approved in draft format for construction as part of the issue of consent by both Greater Wellington Regional Council and Porirua City Council. The final documentation is to be submitted to Council(s) for final approval post grant of consent and will reflect changes request as a request of the consenting process and will confirm the final roles and responsibilities of various consultants and contractors. The EMPC includes the following documents Earthworks Construction Management Plan related to Erosion and Sediment Control, Bridge Construction Management Plan, Flocculation Management Plan Stream Diversion and Stream Works Plan. This Plan is to be read and implemented as part of the contract documentation. The greatest importance is to be placed on adherence to the conditions of the relevant resource consents to be issued by Porirua City Council and Greater Wellington Regional Council and the matters included within this document. Copies of all approved plans and documentation, including, resource consent approvals are to be included as future appendices within this document post grant of consent and subsequent approval of associated construction plans Duck Creek North, Whitby (The Project) is located in the sensitive catchments of Duck Creek and the Pauatahanui Inlet. The carefully planned management of all construction activities associated with The Project is required to ensure the effects on these regionally significant waterbodies are minimised as much as practicable. This EMPC aims to provide all the appropriate methodologies, processes and controls required to achieve the environmental objectives and the requirements of resource consents granted for these works. The consent holder shall provide a copy of this consent and any documents and plans referred to in this document to each operator or contractor undertaking works authorised by consents within this document, prior to the works commencing. Any amendment proposed to this approved Environmental Management Plan for Construction shall be submitted in writing to the Manager, Environmental Regulation, Wellington Regional Council. Implementation of any amendment shall only occur once the amendment has been authorised in writing by the Manager, Environmental Regulation, Wellington Regional Council. Disclaimer: Copyright in the whole and every part of this document belongs to Cardno and may not be used, sold, transferred, copied or reproduced in whole or in part in any manner or form or in or on any media to any person other than by agreement with Cardno. This document is produced by Cardno solely for the benefit and use by the client in accordance with the terms of the engagement. Cardno does not and shall not assume any responsibility or liability whatsoever to any third party arising out of any use or reliance by any third party on the content of this document. 8 September 2015 Cardno 1

7 2 Environmental Objectives The development is to be progressed in a manner to preserve and enhance the ecological integrity of the site. In the short term, the objective is to minimise the effects of the earthmoving activity as much as practicable by employing innovative solutions to earthworks, erosion and sediment control. 2.1 Earthworks The earthworks as detailed on the appended plans have been designed to facilitate the construction of future residential dwellings without the need for future site earthworks post the bulk earthworks operation. Building platforms are to be constructed on all proposed allotments 2.2 Erosion and Sediment Control The development shall employ the most effective means of erosion and sediment control available. These controls shall be actively managed to ensure the deposition of silt and debris within the Duck Creek watercourse is minimised as much as practicable. 2.3 Flood Control The finished building platforms will be above the predicted flood water level for the 2090H storm event. Some isolated areas of the roading networks will be floodable within a 2090H event. Please refer to the flood modelling report submitted as part of the consent application for details on this matter. 2.4 Stormwater Quality Specific treatment devices as to be agreed with PCC/GWRC shall be incorporated into the design of the subdivision to provide treatment of stormwater in accordance with Low Impact Urban Design and Development principles. 2.5 Roading Road networks are formed to create a single arterial road servicing small cul-de-sacs. To achieve these objectives, this EMPC document identifies and addresses the following matters: > Environmental management objectives, statutory requirements and contractual requirements; > Roles and responsibilities of all parties including training and public interaction; > The identification of areas on the site of historical, cultural and/or ecological significance and the preparation of an environmental effects register; > Control of site activities and sequencing of work; > General guidelines for erosion and sediment control on this site; > Procedures and techniques to be used to avoid, remedy or mitigate adverse environmental effects during construction; > Inspection programmes, reporting, review, corrective action and contingency measures; > Links from this EMPC to the other Management Plans. 8 September 2015 Cardno 2

8 3 Requirements 3.1 Statutory Requirements > Resource Management Act 1991 and its amendments. > NZS4431:1989 Code of Practice for Earthfill for Residential Development > NZS4402:1986 Methods of Testing Soils for Civil Engineering Purposes > Greater Wellington Regional Council Erosion and Sediment Control Guidelines for the Wellington Region (September 2002). > Porirua City Council General Bylaw 1991 Part 24 Silt and Sediment Control 3.2 Consent Requirements Greater Wellington Regional Council Applications The Greater Wellington Regional Council consent application consists of a number of permits and land use consents. Please refer to the covering consent application for a full list of specific discharge and land use consents being sought Porirua City Council Consents The Porirua City Council consent application consists of a number of consents (subdivision and landuse). Please refer to the covering consent application for a full list of specific consents being sought. This document is prepared under the consent application and is considered approved for construction by General Manager, Environment & Regulatory Services. 3.3 Contractual Requirements The consent holder and contractor(s) are legally required to undertake a number of tasks before, during and after the construction activities. The contractor is to ensure they are familiar with their obligations under this document, the appended consent conditions and the contractor documentation. Below is a list that details some of the requirements. > Site specific document to be confirmed Specification for Earthworks > Monthly Contract Reports: The monthly reporting requirements include comments on environmental management and public feedback (complaints and/or praise); > Environmental Compliance Meetings: Being available to attend meetings where compliance with the EMPC and other Management Plans are reviewed; > Feedback Register: This section requires the contractor to maintain a feedback register. 8 September 2015 Cardno 3

9 4 Project Management Plan Structure The structure of the collective Project Management Plans are shown by the diagram below: (Other plans may be prepared by others) Environment Management Plan (Construction) - EMPC Flocculation Management Plan (FMP) Earthworks Construction Plan (ECP) Stream Diversion and Stream Works Bridge Construction Plan (BCP) This document outlines the major details of the other associated management plans which shall control the construction and management procedures for the construction phase of the development project. 8 September 2015 Cardno 4

10 5 Environmental Responsibilities of Staff There are four groups with responsibility in regard to environmental management for the project: > Jagger NZ Ltd. as the owner of the project and holder of the resource consents; > [ TBC ] as the project managers, designers, engineers, planners and supervisors of the development; > Ecological experts to overview and monitor the instream water quality monitoring. > The contractors undertaking the works; Within the contractors group there are expected to be three major contractors: the main earthworks contractor, the civil works (roading and services) contractor and the permanent bridge contractor. The main earthworks contractor will be responsible for the whole site except for areas that are under the direct control of the other major contractor. Due to the higher risk of environmental impacts during the main earthmoving phase, the contractor undertaking these works will be required to read the EMPC and the CMP and sign a declaration that they have read and understood them. Other contractors will be required to read and have input into the approved EMPC and any other relevant Management Plan and sign a declaration of understanding. The table below identifies environmental management roles on site. Table 5-1 Environmental Management Roles Name Company Position Responsibilities Bob Turner Jagger NZ Ltd Director Overall responsibility for the project and the project team TBC TBC Engineer to the Contract Responsible for overall construction and for ensuring all activities comply with resource consent conditions. TBC TBC Project Manager Ensuring contractor compliance with the contract documents, which will include requirement for carrying out the works in accordance with the relevant resource consent conditions. Maintains register of documents and plans TBC TBC Environmental Manager Walk over survey at detailed design to assist with design and Management Plan development, assist with review of Management Plans, compile monitoring results and prepare Monthly Construction Monitoring Reports Approval of EMPC and CMP updates. TBC TBC Contract Supervisor Reporting to Project Manager and Engineer to the Contract on construction progress and compliance, undertakes daily site inspections with the Site Manager. Inspections of works to ensure compliance with EMPC and CMP. TBC TBC In-stream Ecologist Reporting to Project Manager, supervises and/or undertakes the ecological monitoring on the site as required TBC TBC Site Manager Overall responsibility for environmental management compliance and contract compliance onsite: Reviewing environmental performance; On-site compliance with consent conditions; Adherence to EMPC and CMP; Daily Inspections and monthly reporting; Receives complaints for inclusion in the public feedback record and responds; Ensuring training is undertaken; 8 September 2015 Cardno 5

11 Ensuring all sub-contractors know the requirements of EMPC & CMP All contractors involved with the construction and commissioning works will be required to read the EMPC and the CMP and sign a declaration that they have read and understood them. 8 September 2015 Cardno 6

12 6 Pre-Construction Requirements The following tasks below must be completed by the consent holder prior to works commencing. The contractor is to seek confirmation from the Engineer to the Contract that the tasks listed below have been completed. 6.1 Construction Activity plan The consent holder shall provide a detailed schedule of construction activities, management plans and monitoring plans, to the Manager, Environmental Regulation, Wellington Regional Council, at least 5 working days prior to the commencement of works. This schedule shall be updated at monthly intervals during the works. The schedule shall include the details of: 1. The commencement date and expected duration of each stage of the works subject to this consent. 2. The timing of monitoring reports necessary to fulfil the conditions of this consent. 6.2 Pre-Construction site Meeting The consent holder shall arrange and conduct a pre-construction site meeting prior to any work authorised by this consent commencing for each stage of the works and must invite, with a minimum of 5 working daysnotice, the Wellington Regional Council and a representative from each key contractor undertaking the works. The matters to be covered in the pre-construction meetings are provided on the pre-construction meeting checklist ( 6.3 Minimum notice of works prior to works commencing The Manager, Environmental Regulation, Wellington Regional Council, shall be given a minimum of two working days (48 hours) notice prior to the works commencing for each stage of the works. 6.4 Certification of ESC devices Prior to bulk earthworks commencing for each stage, the consent holder shall provide to the Manager, Environmental Regulation, Wellington Regional Council a certificate signed by an appropriately qualified and experienced engineer to certify that the erosion and sediment controls for that stage have been constructed in accordance with the Earthworks Construction Plan and Flocculant Management Plan, and the current version (at the time of submission of the ECP) of the Erosion and Sediment Control Guidelines for the Wellington Region as a minimum standard. Certification shall include, but not be limited to, the following: a) Confirmation of contributing catchments, dimensions and storage volumes of sediment retention ponds, decanting earth bunds, silt fences and diversion channels/bunds as applicable b) As-built plans of the key erosion and sediment controls measures; and c) Any other details that will facilitate assessment of compliance with the authorised ECP, authorised FMP and the Erosion and Sediment Control Guidelines for the Wellington Region (September 2002). Certification that the appropriate measures are in place shall be submitted to the Manager, Environmental Regulation, Wellington Regional Council within 5 working days of completing the audit. The consent holder is to complete the sediment control device as-built check sheets available on the Greater Wellington Regional Council s website and to submit these with the certification required under this condition. 8 September 2015 Cardno 7

13 6.5 Environmental Site Induction The main contractor s staff working on the project will be required to undertake a site induction prior to earthworks commencing on the site. This induction will include outlining all relevant environmental management matters and as a minimum shall include; > Objectives and key issues of the EMPC listed in Section above > Duty of Care and Duty to notify > Environmental Emergency Response Procedure > Reporting of public feedback and environmental incidents > Conditions of Consents and Approvals > Key site specific issues relating to the EMPC Further inductions shall take place as new personnel, contactors and sub-contractors start works on the site. A record will be kept of people who have undertaken the induction. Weekly meetings shall be held by the contractor and project team. As part of these weekly meetings environmental issues will be an agenda item. The meeting will be used to stress the importance of effective and efficient environmental management practices. These meetings will also be structured to obtain feedback on the project and how to improve performance. Suggestions to improve environmental management will be actioned by the individual contract managers, site manager or construction manager. Records of the weekly meetings are to be kept on site. 8 September 2015 Cardno 8

14 7 During Construction 7.1 Inspections, Monitoring and Reporting Daily Inspections During the main phase of earthworks, the Contractors Representative or a suitability experienced person as nominated by the consent holder will visit the site daily to confirm works are progressing in general accordance with the Contractors programme, the EMPC, ECP, and all relevant Resource Consents. Daily inspections shall be conducted by both the Contractor and Client representative (as required) and shall include, but not be limited to; > Weather forecast > Methodology for the days earthworks activity cut from location A, mixing with soil from location B, filling at location C > Water quality observations, including downstream of the site > Erosion and Sediment Controls relating to the methodology for the days earthworks including installation of additional controls where required > Dust and air quality controls > Fuels and chemicals onsite are stored appropriately and operations surrounding these areas are controlled > Noise and waste are minimised as much as practicable > Traffic movements are minimised as much as practicable > Flora and fauna are protected > Health and Safety measures are employed onsite, in line with current best practice Notes on site observations and discussions between the Contract Supervisor and the Site Manager will be taken and will form the basis of the weekly report to the Project Manager. The contractor is to send though a record of the daily inspections undertaken on a weekly basis Weekly Site Audits [XXXX] shall undertake weekly site audits to ensure that the erosion and sediment control methods are being maintained in accordance with the Earthworks Construction Plan and Flocculant Management Plan. The audits shall include: > Date; > Name of auditor; > Site condition; > Weather conditions; > Sediment management (including identification of problem areas that are not being treated by sediment control measures, and any measures put in place to treat these areas); > Runoff control (check of diversion channels and check sediment retention ponds); > Condition of sediment control measures, including silt fences, contour drains and sediment retention ponds; > Maintenance required and the date this will be completed by; > The contractor responsible for the maintenance; and 8 September 2015 Cardno 9

15 > General comments. A check sheet template is to be prepared to record the weekly site audits, which are to be sent to the Clients representative by the Tuesday of the following week Inspection and Monitoring Schedule The frequency of the audits may be reduced if agreed in writing by the Manger, Environmental Regulation, Wellington Regional Council Reporting of Site Audits The results of the weekly audits shall be submitted each month to the Manager, Environmental Regulation, Wellington Regional Council, no later than the 15th of the following month. 7.2 Complaints and Feedback Procedures Public Feedback All employees of the main earthworks contractor will be trained to report any feedback (be it complaints and/or praise) from site visitors, neighbouring property owners or the surrounding community to the Site Manager s Office as soon as is reasonable practical to do so. All feedback received in respect of the construction works will be recorded in a Public Feedback Record, which will be maintained by the Site Manager. The record will keep details of: > Date of feedback; > Name of event; > Name and address of person providing feedback; > Details of feedback, including weather conditions; > Action to prevent further similar complaints; > Date of oral response; > Date of written response In response to feedback that is considered a complaint, the Site Manager will be required to: > notify the Engineer within 24 hours with an oral response, and > within 72 hours provide a written response to the Engineer identifying what action is proposed or has been taken to resolve the complaint. Greater Wellington Regional Council will be notified with 24 hours of a compliant being received. Greater Wellington Regional Council can be contacted on September 2015 Cardno 10

16 8 Amendments to the Plan Throughout the course of the project, as monitoring identifies areas where improvements can be made to improve environmental outcomes, it is expected that these improvements can be fed through and be included in the relevant plans. Where changes to this Environmental Management Plan for Construction are identified these shall be discussed with Greater Wellington Regional Council. Any amendment proposed to the authorised Environmental Management Plan for Construction will be submitted in writing to the Manager, Environmental Regulation, Wellington Regional Council. Implementation of any amendment shall only occur once the amendment has been authorised in writing by the Manager, Environmental Regulation, Wellington Regional Council. 8 September 2015 Cardno 11

17 9 Emergency Response Procedure In the event of an Environmental Incident the emergency response procedures outlined in Section 10 should be followed with the Emergency Contacts outlined in Section Emergency Contacts Site Manager: TBC The contractor s site manager, will be responsible for ensuring all staff onsite are aware of the consent requirements and shall complete the works in accordance with these requirements and approved plans within the specified time. If unforeseen circumstances occur which are not covered in the preapproved documents, the site manager will also be responsible for ensuring that the project manager is aware of the issues, and that solutions to reduce the potential environmental impacts are implemented as soon as practicable. Phone: - Mobile: - Engineer to the Contract: TBC The Engineer to the Contract is responsible for resolving major environmental issues, where the issue will cause environmental effects which are more than minor and outside the scope of the Consent document. The Engineer to the Contract will work with the Site Supervisor and Council Staff to provide an appropriate remedial solution to the contractor. Phone: - Mobile: - Contract Supervisor: TBC The Contract Supervisor will be responsible for ensuring works covered in the Consent documents, including all pre-approved plans, is adhered to on a daily basis. Should unforeseen environmental impacts occur as a result of the works, the Contract Supervisor will be the liaison between the Engineer, Council Staff and the Contractor to ensure the level of impact is minimised and a suitable remedy implemented as quickly as possible. Phone: - Mobile: - Contractor: TBC The contractor s nominated foreman will be responsible for completing the works in accordance with the approved documents and drawings. Phone: - Mobile: - Compliance Officer: TBC, Greater Wellington Regional Council The consent holder shall notify the Manager, Environmental Regulation, Wellington Regional Council within 24 hours if any contaminants (including sediment) are released from the site and enter Duck Creek, due to any of the following: > Discharges from unstabilised areas that are not treated by sediment control measures required under this discharge permit, > Failure of any erosion and sediment control measure, or > Any other incident which either directly or indirectly causes or is likely to cause adverse ecological effects on Duck Creek. 8 September 2015 Cardno 12

18 Greater Wellington Regional Council can be contacted on September 2015 Cardno 13

19 Level of Environmental Impact Environmental Management Plan for Construction 10 Reporting Procedures The flow chart below details the process to be undertaken when reporting site issues. Personnel onsite: eg. Digger and Truck drivers Resolve issue/ problem. Report issues or problems to Site Foreman Resolve issue/problem. Report issues or problems to Site Manager: Report issues or problems to Discuss issues or problems with Site Supervisor: Off Site Manager: Consultation Engineer: Regional and City Council Staff 8 September 2015 Cardno 14

20 11 Environmental Impact and Risk Assessment This section identifies the main activities associated with the construction and commissioning of the project and the potential adverse effects. Based upon these potential adverse effects an Environmental Effects Register has been prepared that identifies how these impacts can be avoided, remedied or mitigated. The Environmental Effects Register is designed to ensure that awareness of potential adverse effects and their management is maintained throughout the life of the project Site Description The site for the proposed earthworks is located on the northern section of the former Duck Creek Golf course located west of James Cook Drive. The site is located on undulating terrain comprising relatively flat ground of the Duck Creek stream valley. The meandering stream channel of Duck Creek leads through the site and flows through the DoC administered scenic reserve immediately north of the site before entering into the Pauatahanui Inlet. Around the edges of the site the topography rises up and the surrounding hills are covered in a mixture of residential development and natural bush/vegetation Site limitations Duck Creek is considered to be a regionally significant stream due to the presence of several threatened native fish. Declining fish species of Longfin eel, Giant Kokopu, Koaro, Inanga and Redfin Bully were found at various locations within Duck Creek during sampling. The current streams habitat quality is reduced by bank erosion, aquatic weeds, and a lack of riparian vegetation in some places. Therefore no construction equipment is to enter the stream unless it is for specifically approved works in the stream, such as the placement of erosion protection rip-rap. There are no known areas on the site of historical or cultural significance, as designated on Regional and District planning maps. The main focus of the Management of the Site is therefore the protection of the stream from siltation as a result of the proposed earthworks. The site is currently of an elevation that it is prone to flooding in a reasonable flood event, as such each stage of earthworks will need to be undertaken to ensure the earthworks site is protected from a 1 in 5 year flood event. Site bunding shall be constructed and stabilised using best practice techniques to ensure the outside batter face is protected Site Hazards PCC Trunk Water Main Porirua City Council operates a trunk water main (200mm diameter AC) that crosses the site. The development of the site includes the staged relaying of the main through the site. The majority of this line will be relocated to within future legal road with a small portion within a private allotment.. The protection of this water main during construction is an essential requirement. All work that is associated with, and adjacent to, the water main will be carried out in close liaison with the Engineer, Porirua City Council and Wellington Water. No earthworks, filling or excavation is to be carried out within 2m of the water main without specific written approval of the Engineer. The 2m off-set on each side of the water main is to be shown on the site by the erection of a warning tape (or plastic netting fence) along the length of the water main on the site prior to any work starting on the site (i.e. as part of stage 1 establishment works) Gas main and Electricity/Telecom Cables There is a gas main and electricity/telecom cables leading west from the pump station location before heading north up the slope towards The Crowsnest. There are also electricity and telecom cables heading 8 September 2015 Cardno 15

21 east from the pump station crossing Duck Creek and up to Observatory Close. These services are to be relocated in conjunction with the bulk earthworks. An exclusion zone is shown on the plans to alert all parties to the presence of these services. No work is to be carried out in the exclusion zone associated with these services without written approval from the Engineer Pressurised Bulk Wastewater Main In the northern portion of the site there is a pressurised bulk wastewater main (375mm diameter rising main) leading from the pump station out to SH58. The main is primarily located under the existing access track to the pump station from SH58. Prior to using this access track, this main must be marked out and clearance requirements must be confirmed for heavy construction machinery as part of site establishment works Gravity Bulk Wastewater Main Currently there is a 375mm diameter AC main that leads from Discovery Drive at the southern end of the site up to the pump station. This main passes under the stream in multiple locations and will be affected by future lots so as part of the works it is intended to realign the main (in stages) to remove these creek crossings and keep the alignment in public property to enable maintenance of this line without affecting private property Department of Conservation (DoC) Reserve Immediately downstream of the site is the Department of Conservation administered scenic reserve surrounding Duck Creek and the area where it enters into the Pauatahanui Inlet. This location is a sensitive ecological area so the Contractor must ensure that all ESC measures are in place before before earthworks commence and these are maintained as outlined in the ECP document. Further information to be provided by the contractor as part of a design build tender for the bridge that will outline in further detail the construction methodology of the bridge including associated environmental best practice and detailed ESC etc. Please refer to the sections below with respect to general environment protective measures Main Construction Activities The main construction activities are: Stage 1: > Site establishment and construction of erosion and sediment controls (including SRP 1 and SRP 2); > Construction of foundations, erection and commissioning of permanent bridge 1 at northern end of the site; > Bulk earthworks for Stages 1 (Including Cut Stage 1 Borrow). > Installation of Temporary Bridge 1 > Import/Export certifiable fill and unsuitable material. > Stage 1 of realignment of existing 200mm diameter trunk water main > Construction of underground services; > Formation of roads by excavating to sub-grade and sealing; Stage 2: > Site establishment and construction of erosion and sediment controls; > Installation of Temporary Bridge 1 (if not completed in stage 1) > Bulk earthworks for Stage 2 > Import/Export unsuitable material and certifiable fill. > Stage 2 of realignment of existing 200mm diameter trunk water main > Construction of underground services; 8 September 2015 Cardno 16

22 > Construction of foundations, erection and commissioning of permanent bridge 2; > Completion of stabilisation so that sediment and erosion control pond (SRP 1) can be decommissioned and filled up to final design surface level (if it is not to be used for future stages); > Formation of roads by excavating to sub-grade and sealing; > Removal of temporary bridge 1 once permanent bridge 2 is in operation. Note: There is a permanent stream diversion that will be undertaken at the end of Stage 2 or as an independent stage in the following earthworks season. Stage 3: > Site establishment and construction of erosion and sediment controls; > Installation of Temporary Bridge 2 > Bulk earthworks for Stage 3 > Import/Export unsuitable material and certifiable fill. > Construction of underground services; > Construction of foundations, erection and commissioning of permanent bridge 3; > Completion of stabilisation so that sediment and erosion control pond (SRP 2) can be decommissioned and filled up to final design surface level; > Formation of roads by excavating to sub-grade and sealing; > Removal of temporary bridge 2 once permanent bridge 3 is in operation. Stage 4: > Bulk earthworks for Stage 4 > Import/Export unsuitable material and certifiable fill. > Construction of underground services; > Construction of foundations, erection and commissioning of permanent bridge 3; > Completion of stabilisation so that sediment and erosion control pond (location subject to detailed design) can be decommissioned and filled up to final design surface level; 11.5 Potential Adverse Effects If not managed appropriately, the construction activities associated with this project can lead to adverse effects. These effects will be avoided by the development through compliance with this EMPC and the associated requirements outlined in Section 2. These management plans will address the following potential adverse effects; > Erosion by exposing unstable surfaces and/or through discharges of stormwater runoff, > Deterioration of water quality in Duck Creek from the effects of sediment discharges from disturbed areas; > Deterioration of water quality in Duck Creek from the effects of discharges associated with the construction of the temporary and permanent bridges; > Contamination of the air with dust; > Excessive noise discharges; > Loss of top soil due to poor storage and handling; > Visual effects of open cut batters; 8 September 2015 Cardno 17

23 11.6 Erosion and Sediment Control Principals The minimisation of erosion and active management of sediment runoff from the earthworked areas is the main focus of earthmoving projects, particularly in sensitive environments such as Duck Creek. The erosion and sediment control measures adopted for this project are therefore aimed at ensuring a high level of protection against sediment discharges into Duck Creek during low to medium intensity rainfall events, and protection against uncontrolled discharges and scour during high intensity rainfall events. The management procedures proposed for the control of erosion and the treatment of sediment run-off, from earth-worked areas, for this project are based on the following principles: > Not working during inclement weather; > Minimise disturbance; > Staged construction; > Protect steep slopes; > Protect water bodies; > Stabilise and rehabilitate exposed areas rapidly and progressively; > Install perimeter controls; > Employ detention devices; > Implement an evolving CMP; > Inspect the performance of the procedures; > Maintain all erosion and sediment control measures to ensure maximum efficiency; > Install additional measures prior to medium to high intensity rainfall events, where practicable. Each of the above principals will be employed for The Project as detailed in Section 10. Site specific solutions have been developed and will be implemented as detailed in the CMP, taking into account construction and maintenance requirements. The solutions proposed are currently being used on most well managed earthwork projects throughout New Zealand and are based on the methods documented in Auckland Regional Council s TP90 and Greater Wellington Regional Council s, Erosion and Sediment Control Guidelines for the Wellington Region. Additional measures, not included in the above Documents, but to be employed in The Project include; > Grit traps similar to a small forebay to reduce flow velocities prior to discharge into either a pond, or diversion channel; > Filtrexx barriers (in combination with silt fences) similar to silt fence in function, they are a compost filled sock to trap sediment as water passes through; > Outlet controls on Sediment Ponds discharges from sediment ponds will, where practicable, discharge to land rather than a water course. This will facilitate additional filtration through pasture and improve the quality of the sediment discharge to the nearest watercourse; > Stabilised level spreader all sediment ponds will have a concreted level spreader to eliminate scour in this area, and improve the overall performance of the pond. > Baffles all sediment ponds will have porous baffles to improve the rate of settlement for suspended particles, increasing the efficiency of the pond Dust and Odour Control Dust and odour may become a problem during certain weather conditions, causing disturbance to neighbouring properties. Dust and odour may be generated from both works on site and the cartage of materials from the site through adjoining streets. 8 September 2015 Cardno 18

24 If dust and odour become a problem, the contractor shall employ appropriate control measures to avoid, remedy and mitigate any adverse effects. The following measures should be used to minimise effects of excessive dust and odour on adjoining properties. A water cart with sufficient water resources shall be available on short notice for the duration of the contract works. Where the water cart is unable to mitigate any hazard, earthworks shall cease until the hazard is removed by alternative means, as discussed in the contingency plan. Haul roads and other areas of major dust source shall be kept damp during dry periods to minimise public nuisance. All storage areas, loading and unloading operations, blending or mulching processes and other activities carried out on site shall be conducted and managed in such a manner as to ensure that all dust and particulate emissions are kept to a practical minimum. Where the existing landform or vegetative cover is being disturbed, ground cover is to be established immediately following earthworks and with a minimum of delay to ensure the wind erosion of soil or other material does not become a nuisance. Site works shall be managed in such a manner to ensure that there shall not be any objectionable odour at or beyond the boundary of the subject property Noise Control The development of land involving earthworks will always create construction noise, mainly due to the machinery used. All practicable measures to keep noise to an acceptable level should be implemented. This includes but is not limited to mufflers being used on all earthworking machinery. Heavy machinery or plant may only operate on the site between 7:00am and 6:00pm Monday to Friday and between 7:00am and 4:00pm Saturday. The transportation of heavy machinery onto or off the site should only occur between 8:00am and 6:00pm Monday to Friday and between 8:00am and 4:00pm Saturday Cartage of Materials and Machinery The contractor shall liaise with any relevant traffic controlling authority and all entry and exit from the site will be in accordance with the Traffic Management Plan approved for construction (by others) to minimise congestion of traffic particularly during peak traffic flow periods. Vehicles shall be loaded in such a manner that there is no spillage in any public place during conveyance off the site. Pedestrians, traffic and streets shall be protected from and be free from mud and debris Important Contractor Requirements The consent holder shall ensure that: All on-site storage areas for fuels and lubricants are bunded or contained in such a manner so as to prevent the discharge or spillages of such contaminants; All machinery is regularly maintained in such a manner so as to minimise the potential for leakage of fuels and lubricants; No equipment or machinery is cleaned, stored or refuelled within 20 metres of any watercourse; All machinery is thoroughly cleaned of unwanted vegetation (e.g. weeds), seeds or contaminants prior to enter the site; and No contaminants (including but not limited to oil, petrol, diesel, hydraulic fluid) shall be released into water from equipment being used for the works. The consent holder shall ensure that no wet concrete or concrete washwater enters any watercourse during, or as a result of the works. The Manager, Environmental Regulation, Wellington Regional Council, shall be notified immediately (within 12 hours) if any wet concrete or concrete washwater enters any watercourse. 8 September 2015 Cardno 19

25 Any excess material from the construction and implementation of the works shall be removed from site and disposed of in an appropriate manner. If koiwi, taonga or other archaeological material is discovered in any area during the works, work shall immediately cease and the consent holder shall contact Ngati Toa Rangatira, the New Zealand Historic Places Trust and Wellington Regional Council within twenty four hours. If human remains are found, the New Zealand Police shall also be contacted. The consent holder shall allow the above parties to inspect the site and in consultation with them, identify what needs to occur before work can resume. Note: Evidence of archaeological material may include burnt stones, charcoal, rubbish heaps, shell, bone, old building foundations, artefacts and human burials. 8 September 2015 Cardno 20

26 12 Project Construction Programme The programme below provides indicative timing for key phases of the project. The programme will be updated and submitted to GWRC monthly throughout construction. Table 12-1 Description Construction Programme Option 1 Diversion in conjunction with Stage 2 Earthworks Estimated Programme Installation of ESC devices October 2015 Stage 1 Earthworks October June 2016 Bridge 1 Construction November 2015 February 2016 Stage 1 Roading and Services February October 2016 Stage 2 Earthworks October June 2017 Bridge 2 Construction October December 2016 Stage 2 Roading and Services February October 2017 Creek Construction & Diversion January March 2017 Stage 3 Earthworks October June 2018 Bridge 3 Construction October December 2017 Stage 3 Roading and Services February October 2018 Stage 4 Earthworks October June 2019 Stage 4 Roading and Services February October 2019 Table 12-2 Construction Programme Option 2 Diversion as independent construction season Description Estimated Programme Installation of ESC devices October 2015 Stage 1 Earthworks October June 2016 Bridge 1 Construction November 2015 February 2016 Stage 1 Roading and Services February October 2016 Stage 2 Earthworks October June 2017 Bridge 2 Construction October December 2016 Stage 2 Roading and Services February October 2017 Creek Construction & Diversion October December 2017 Stage 3 Earthworks October 2018 June 2019 Bridge 3 Construction October December 2018 Stage 3 Roading and Services February October 2019 Stage 4 Earthworks October June 2020 Stage 4 Roading and Services February October September 2015 Cardno 21

27 01 EARTHWORKS CONSTRUCTION PLAN (ECP) STAGE 1 8 September 2015 Cardno 22

28 1 Earthworks Construction Management Plan Copyright in the whole and every part of this document belongs to Cardno and may not be used, sold, transferred, copied or reproduced in whole or in part in any manner or form or in or on any media to any person other than by agreement with Cardno. This document is produced by Cardno solely for the benefit and use by the client in accordance with the terms of the engagement. Cardno does not and shall not assume any responsibility or liability whatsoever to any third party arising out of any use or reliance by any third party on the content of this document. 1.1 Scope This Earthworks Construction Plan incorporates the Erosion and Sediment Controls (ECP) for each phase of the earthworks for Duck Creek North, Whitby. The ECP is to be approved prior to the commencement of construction. The ECP has been prepared in accordance with the current version (at the time of submission of the ECP) of the Erosion and Sediment Control Guidelines for the Wellington. The ECP reflects the measures outlined in the Environmental Management Plan for Construction. This Earthworks Construction Management Plan (CMP) has been prepared for the bulk earthworks of Duck Creek North. It is intended to undertake the earthworks within one construction season. Emphasis is placed on the avoidance, mitigation or remediation of potential adverse environmental effects on Duck Creek, and the residential properties to the north, as a direct result of earthworks. This Earthworks CMP will be implemented prior to the commencement of any earthworks on site. As earthworks sites are dynamic and site slopes are constantly changing, variations to this plan shall be required to maintain an appropriate level of protection for sensitive downstream environments. 1.2 Earthworks Description The proposed bulk earthworks will be undertaken in four stages, as shown on Cardno Plan NZ PL- C120 Rev 2. In summary, the Stage 1 earthworks involve: the stripping of approximately 13,000m 3 of topsoil from the areas to be earthworked; excavation of approximately 23,000m 3 of cut material; the placement of all of the cut material into the fill (excluding any unsuitable material encountered); the import and placement of approximately 35,000m 3 of material from off site into the fill; the completion of approximately 53,000m 3 of fill (plus an additional allowance of 5,000m 3 for compaction of cut material); the respreading of approximately 4,000m 3 of topsoil over the developed lots and berms; the removal of approximately 9,000m 3 of excess topsoil from the site; the removal of approximately 11,000m 3 of unsuitable material from the site that is expected to be encountered within the earthworks operation. The maximum height of the cut is 4m and these results in a maximum cut batter of 7.5m around the cut in Stage 1 along the western boundary of the site. The maximum height of the fill batter is 3m but the average depth of filling is approximately 1.9m. The fill material is to suitable material sourced from the cut areas on site or imported from another suitable location. No material defined as unacceptable in the Ministry for the Environment s A Guide to the Management of Clean Fills is to be deposited in any of the fill areas. 8 September 2015 Cardno 23

29 All material is to be placed and compacted to achieve the final contours shown on the plans. The completed profile is to be topsoiled and stabilised to minimise excessive runoff. All compaction is to be in accordance with NZS4431:1989. No earthworks under the proposed consent, other than those subject to this Earthworks CMP, will be undertaken without prior approval from GWRC Purpose of Works The intent of the proposed works is to achieve uniform and gentle slopes suitable for the planned residential development, including suitable gradients for roads. The works will involve the installation of two temporary bridge structures on Duck Creek to allow for the installation of a haul road to link all parts of the site during earthworks construction. The works will also involve the construction of three permanent bridge structures on Duck Creek for permanent access to the entire site Site Description The site is the northern part of the former Whitby Golf Course off Discovery Drive (West of James Cook Drive), Whitby. The proposed residential subdivision is to be situated on the mostly flat to gently sloping land near Duck Creek to the south of where Duck Creek discharges to the Pauatahanui Arm of the Porirua Harbour. Duck Creek runs through the site and several permanent crossings will need to be constructed to maintain access to all areas of the site. Notable aspects of the site that influence the construction include the presence of the 200mm diameter AC Trunk Water Main and 375mm diameter AC bulk sewer main crossing the site that will need to be relocated during the works. The trunk water main crossing the site will be realigned between the eastern and western boundaries of the site to ensure that the main is located in the road corridor to enable future maintenance of this line. This realignment will be undertaken in two stages. The first stage will be undertaken in conjunction with the Stage 1 earthworks on the western side of the creek, constructing a new 200mm diameter line shifting the trunk main away from the western boundary into the future road corridor. The second stage will then connect into the new line and cross permanent bridge 2 before connecting into the existing main adjacent to the eastern boundary. A portion of the first stage realignment will be abandoned upon completion of the second stage as it will be no longer required. No work is to be carried out in the vicinity of the water main or wastewater main without written approval from the Engineer. The development requires the construction of three permanent bridges to access all areas of the site. The design is such that the deck undersides are clear of the required flood events as detailed in the Flood modelling report Site Construction Access Access to the site is currently from the northern end of the site off SH58 along the access track to the wastewater pump station. This will only be used for site access until the permanent bridge is constructed, provided access to the site from James Cook Drive. Aside from when the earth working machinery is brought to the site and the arrival and departure of workers from the site at the beginning and end of a working day, the number of vehicle movements to and from the site is to be kept to an absolute minimum. While bridge 1 is under construction the importing and removal of material from site will be via the SH58 access. Please refer to the prepared traffic management plan for construction prepared by others that details the requirements for entering and exiting the site during this phase of works Hours of Operation Hours of operation for the works on the site, including machinery warming up, shall be as follows: Monday to Friday 7.00am to 6pm 8 September 2015 Cardno 24

30 Saturday 8am to 4pm No work is to be carried out on Sundays or public holidays. Machinery warm up must be within the above start times. Heavy machinery or plant may only access/ exit the site and operate on the site between 8:00am and 6:00pm Monday to Friday and between 8:00am and 4:00pm Saturday. The exception to the above hours being that any emergency remedial works required for example, in relation to slips or general safety issues on the site or adjoining sites relative to the proposed earthworks or silt control installations, including repair after heavy rainfall, will not be subject to these restrictions General Health and Safety Provisions The contractor shall comply with all relevant health and safety regulations and adopt best practice guidelines for activities occurring on and off site which are directly related to the nature of works required. These measures shall include the provision of appropriate signage and fencing where necessary to ensure public safety during the period of works Discovery of Artefacts If koiwi, taonga or other archaeological material is discovered in any area during the works, work shall immediately cease and the consent holder shall contact Ngati Toa Rangatira, the New Zealand Historic Places Trust and Wellington Regional Council within twenty four hours. If human remains are found, the New Zealand Police shall also be contacted. The consent holder shall allow the above parties to inspect the site and in consultation with them, identify what needs to occur before work can resume. Note: Evidence of archaeological material may include burnt stones, charcoal, rubbish heaps, shell, bone, old building foundations, artefacts and human burials Programme and Methodology The earthworks are planned for earthworks construction season 2015/16. The bulk earthworks for Stage 1 will take approximately 5-6 months to complete and will follow the steps outlined below. The earthworks will be carried out in a sequence that achieves a satisfactory progress, whilst achieving the desired management of surface water runoff to ensure appropriate management of erosion and sediment control. The key activities are shown below. The key aspects of the methodology are: Install E & S Control devices (including SRP 1 and 2); Commence construction of permanent bridge 1 off James Cook Drive; Construction of temporary bridge 1 to provide access to Future Stage 2; Progressively stripping topsoil from areas 1A, 1B and cut borrow area and stockpiling in Stage 2 location; Initiate filling in area 1A with a combination of imported material and cut from onsite (from area 1B and borrow area), including shaping haul road to protect pressurised main at toe of the hillside. As area 1A is progressed, commence cut to fill in the area 1B with ensuring that exposed area remains under 3Ha and the flow path to SRP 1 is maintained throughout the operation; The proposed road corridor in area 1A is to be stabilised with crushed concrete/metal as it is brought up to grade. Complete the construction of the permanent bridge and the bridge approach works. This is expected to be completed in late 2015; Complete the cut to fill in phase 1A area and complete stabilisation. This is expected to be completed in late 2015; 8 September 2015 Cardno 25

31 As area 1A is completed and area 1B is being progressively stabilised, area 2 can be opened up for cut to fill. Complete cut to fill in area 1B, area 2 and the cut borrow area and complete stabilisation of these areas. Stabilisation will be completed on the final areas, which is expected to be completed in June 2016; The programme set out above is an indicative programme. Where earthworks can proceed in different areas without reliance on earlier implementation of sediment controls this may be undertaken concurrently rather than consecutively. 1.3 General Erosion and Sediment Controls Stabilised Construction Entrance A stabilised construction entrance shall be installed at a suitable location between the entrances from SH58 and James Cook Drive and the construction site ensuring that all truck movement use the aggregate pad. Design and maintenance of the stabilised construction entrance shall be in accordance with the Greater Wellington Guidelines. A wheel wash facility shall be provided if required Surface Roughening and Battering Surface roughening shall be undertaken by machinery tracking after completion of the slopes. Benches shall be used to break up steep slopes and bunding shall be constructed at the top of the slopes. Methodology and maintenance shall be in accordance with the GWRC Guidelines Heavy Rainfall Contingency Measures If heavy rain is forecast or can be reasonable foreseen measures shall be taken on site to reduce the potential for erosion or discharge of sediment laden water. These steps shall be especially prudent where the heavy rainfall event is due to be greater than the design event of the control devices. All stockpiles shall be covered in straw mulching (or similar approved method) or geotextile fabric where it can be sourced in sufficient time. All earthworks areas shall be compacted and surfaced roughened to the extent that is practicable taking into account the slopes, stage of earthworks, equipment available and time prior to the occurrence of the rainfall event. All control devices shall be checked to ensure they will be operating effectively during the rainfall event. Additional decanting grit traps shall be placed if practicable to reduce the loading on the permanent sediment controls Isolation from Floodwaters The sediment control devices are designed to cater for up to a 5-year event and therefore should be protected from at least such a flood event. Greater flood events will not affect the sediment controls which shall already be operating over capacity. The flood level to be protected against shall be the level of the 10- year flood as per the modelling carried out for the Cardno Flood Model Report. Depending on the extent of the earthworks and flood protection measures this may correspond with a rainfall event higher than a 10- year rainfall event so should provide more than sufficient protection and freeboard in the events where the device is still going to be functioning. The theoretical stream level in the modelled event is less than the earthworks levels and the top of the SRPs, therefore no mitigation measures are required. 1.4 Specific Erosion and Sediment Control Measures The following proposed measures are indicative of the locations and types of measures required for this site. As the earth working operation progresses, the Site Foreman, Engineer, Project Manager or Regional Council may request that these measures need to be moved, altered, or removed to ensure sediment runoff from the site is kept to an absolute minimum, without unduly affecting the surrounding environment. 8 September 2015 Cardno 26

32 Note: Preliminary calculations for the proposed Sediment Retention Ponds and main Runoff Channel leading to SRP 1 have been included in this draft report. Additional detail and calculations will be provided in the ESCP for approval following detailed design Sediment Retention Ponds (SRP) Two sediment retention ponds shall be used during the earthworks to control sediment. They have been sized in accordance with the Greater Wellington Regional Council Guidelines, Clause 5.1, and are summarised in the Table below. Ponds are shown on Cardno Plans NZ PL-C201 C204, attached in Appendix A (or within the supplied plan set) Table 1-4 Pond Summary Pond ID Catchment Area (Ha) Volume (m³) Length (m) Width (m) Decants Pipe Outlet (m) SRP SRP Emergency Spillway Width (m) The ponds have been sized on the basis of 370m³ of retention volume per hectare of earthworks area. The pond volume ensures that the pond has the capacity for a five year event. Both ponds shall have a forebay of 10% of the volume to increase the efficiency of the pond and shall be flocculated in accordance with the Flocculation Management Plan. The spillway width is designed for 100-year event minus the flow in through the decant and primary spillway outlet pipe. In addition to being a standard flocculant pond it is proposed that each of the ponds will also have 5 porous baffles, constructed from Propex Landlok 300, a turf reinforcement mat supplied by Cirtex (positions to be confirmed), to increase the rate of settlement in the ponds further increasing their efficiency. These will be installed to seek an improved performance in the reduction of sediment through the device prior to discharge. The arrangement and design of the baffles is to be based on information presented in the research paper Optimisation of baffles for sediment retention ponds published from the University of Auckland. The contractor is also responsible for ensuring that the sediment retention ponds are fit for purpose from a health and safety perspective. All ponds are to be fenced off and signboards erected to deter unauthorised access into the ponds. All weather access must be provided to the decants and outlet chamber so that water quality monitoring can be safely undertaken during/following heavy storm events. Contractor also to provide a solution that enables the decants to be raised in a safe manner without entering the pond (ie rope and pully system) Pond Outlets & Discharge flow path The sediment pond outlets are indicated on the erosion and sediment control plans for each stage. SRP 1 shall have two decants discharging via a central outlet manhole to a 300mm diameter pipe. Pond SRP 2 shall have a single decant to a 100mm diameter pipe. The outlet shall discharge through a bubble up sump to a vegetated dispersal zone bounded by silt fences with regular check dams along its length. This will allow clean water from the pond to be discharged at low velocities to land and some reasonable mixing to occur prior to reaching watercourses Pond Emergency Spillway The emergency spillway for SRP1 will discharge into the vegetated dispersal zone (detailed above) before flowing down the bank to Duck Creek. The emergency spillway for SRP2 will be directed by the overflow channel to discharge into Duck Creek. Erosion protection will be used to maintain a stabilised channel Silt Fences (SF) and Super Silt Fences (SSF) Silt fences and super silt fences provide control around pond areas and small areas where runoff channels cannot capture sediment laden runoff. The fill batter slopes will be controlled by Super Silt Fence as the only control device as the levels do not allow drainage into the SRPs. Fences are placed within the requirements 8 September 2015 Cardno 27

33 of Clauses 5.3 and 5.4 of the Greater Wellington Regional Council Guidelines for Erosion and Sediment Control. Regular returns on the silt fences are to be installed during the installation of the silt fence to ensure the returns trap run off and avoid longitudinal flow through to a possible low point Runoff Channels/Diversion Bunds (RC) Sediment laden water shall be directed to ponds via RC s. All RC s are trapezoidal shaped and have been sized for their respective flows in a 20-year, 10 minute rainfall event. The 10 minute rainfall duration was calculated based on the short catchment lengths and the lack of vegetation cover. RC s are shown on the plan in their starting position, generally along the cut/fill boundary. Once earthworks are sufficiently established the RC can move to the top of the fill batter to maximise the sediment laden catchment area of the ponds. Stabilisation of all RC s is recommended and will be considered at time of detailed design. Aspects that will be considered will include; soil type, grade, catchment, flow rate, location. Stabilised channels, as with all channels, will be visually inspected along the entire length after each storm event with maintenance occurring where required Clear Water Channels/Diversion Bunds (CW) Where possible the earthworks area is to be isolated from runoff originating uphill of the site by diverting the clear water around the site using Clearwater Channels/Diversion Bunds, which shall be used in accordance with clause 4.1 of the Erosion and Sediment Control Guidelines for the Wellington Region (the Guidelines). The majority of runoff from uphill of the site shall be collected during all stages of the earthworks and directed around the earthworks area for discharge to their respective gullies and/or stormwater pipes. By this manner the sediment runoff catchment boundaries shall be clearly defined and maintained, and the majority of clear stormwater runoff shall be restricted from entering the earthworks area. Where the grade of the channel is required to be over 2%, they will be armoured with suitability size rock. All CW have been sized for their respective flows in a 20-year, 20 minute rainfall event. The 20 minute rainfall duration was determined from the time of concentration which is higher due to on the long catchment lengths and the high level of vegetation cover. All clearwater bunds shall be formed by means of a cloth wrapped bund (or similar or approved by the engineer / GWRC). The cloth shall be A14 Bidem cloth securely wrapped around the bund Stormwater Pipes/Culverts For the Stage 2 earthworks a stormwater pipe will be required to be constructed over the creek between Stages 1 & 2, as shown on Cardno Plan NZ PL-C202, in order to carry dirty water from Stage 2 over to SRP 1. This pipe will need to be appropriately anchored and protected to ensure it is not damaged or washed away during flood flow events. We note the elevation of this pipe will be higher than the existing sewer pipe that crosses Duck Creek immediately downstream of the proposed location. 1.5 Site Stabilisation Removal of Erosion and Sediment Controls No Sediment Control structure is to be removed from the site until the earthworks area above has been stabilised appropriately. The Engineer is to direct when removal is to occur, and it may only be done with the approval of Greater Wellington Regional Council. The area of the pond, channel or bund is to be stabilised by grassing following removal Earthworked Areas Stabilisation The means of stabilisation of the site will depend on the nature of the area being stabilised. Rock faces left visible after removal of cut material will not require stabilisation. 8 September 2015 Cardno 28

34 The majority of slopes and flat areas left after cut and fill operations shall be topsoiled and hydroseeded. The application of hydroseed depends on the soil material, the weather and the nature of the slope. Some areas shall have a 30mm down topcourse applied which shall provide a stabilised surface. Areas which require to be stabilised quickly in order to meet one of the hold points will use straw-matting, terraflex hydroseed, polymer (strike) with grass seed (5% application) or alternative as approved by Greater Wellington Regional Council. Areas which are to form the subbase for future road alignments will have rotomillings or metal, including 30mm down, applied to them. Where steep sections of slopes are to be applied with rotomillings or metal, contour channels shall be placed at 20m intervals, or as appropriate, to reduce the flow across the metalled surface and reduce the risk of scour or erosion of the surface. 1.6 Maintenance and Monitoring Erosion and Sediment Control Certification Certification that the Erosion and Sediment Controls have been constructed in accordance with the above shall be issued prior to bulk earthworks commencing. Certification shall include the following: > Confirmation of contributing catchments, dimensions and storage volumes of sediment retention ponds, decanting earth bunds, silt fences and diversion channels/ bunds as applicable. > As-built plans of the key erosion and sediment control measures; and > Any other details that will facilitate assessment of compliance with this plan, the Flocculation Management Plan and the Erosion and Sediment Control Guidelines Plan Review and Amendments There shall be weekly meetings between contract supervisor and the contractor to discuss works on site and management issues. In the event that there is a conflict between works on site and the Plan, a review of the Plan shall be undertaken accordingly. If deemed necessary a review of the plan shall be undertaken with consultation from all appropriate persons. The revised plan shall be approved by Greater Wellington Regional Council prior to implementation Maintenance of Erosion and Sediment Control Measures All maintenance of the sediment control features to be employed on the site is to be in accordance with GWRC Guidelines. Specifically: Sediment Retention Ponds and Decanting Earth Bunds > Inspect ponds every day, before forecasted rainfall event, and after every rainfall event. > Immediately repair any damage. > Repair perimeter fence as required. > Clean out ponds (and forebays) before volume of accumulated sediment reaches 20% of total pond/forebayvolume > Clean out using sludge pumps or excavators containment areas created using 500mm high mulch bunds. The sediment laden water will filter through the mulch bunds and be treated prior to discharging at a slow rate over land. Following a treatment period of up to three weeks the remaining sediment laden water will be pumped back into the pond and the solids will be taken to the dump. > All sediment removed must be disposed of responsibly to an approved receiving facility, such as mixing with temporary unsuitable earthworks stockpiles for drying and use as non-engineered filling on future earthworks sites. 8 September 2015 Cardno 29

35 > It should be noted that pond sizes are based on the predicted flow from a 1 in 5 year storm. Storm events larger than this may result in pond failure and therefore these items must be thoroughly checked and additional measures installed when heavy rain is forecast. Runoff Diversion Channel and Bund > Inspect channels and bunds regularly and after each rainfall event to check for accumulated sediment which may cause overtopping or for any signs of breaching. > Check any discharge points for signs of scouring and install further armouring or other stabilisation if scouring is evident. > All sediment removed must be disposed of responsibly to an approved receiving facility, such as mixing with temporary unsuitable earthworks stockpiles for drying and use as non-engineered filling on future earthworks sites. Super Silt Fences > Inspect fences at least once a week and before and after each rainfall event. > Make any necessary repair when bulges occur or when sediment accumulation reaches 20% up the fabric height. Remove sediment deposits as necessary to the stockpile. > Any areas of ineffectiveness need to be removed and replaced so that they are effective. Stabilised Construction Entrance > Maintain the stabilised construction entrance in a condition to prevent sediment from leaving the construction site. After each rainfall inspect any structure used to trap sediment from the stabilised construction entrance and clean out as necessary. > When wheel washing is also required, ensure this is done on an area stabilised with aggregate which drains to an approved sediment retention facility. > Where mud is tracked onto the public road, it shall be cleaned at the end of each day. 1.7 References 1. ARC (1999), 'Erosion and Sediment Control: Guidelines for Land Disturbing Activities in Auckland Region', Auckland Regional Council Technical Publication Farjood, A., Melville, B. W., and Shamseldin, A. Y. "Optimisation of Baffles for Sediment Retention Ponds" Proceedings of International Conference on Stormwater, 2015 Asia Pacific Stormwater Conference 3. GWRC (2006), Erosion and Sediment Control Guidelines for the Wellington Region. 8 September 2015 Cardno 30

36 02 BRIDGE CONSTRUCTION PLAN (BCP) 8 September 2015 Cardno 31

37 2 Bridge Construction Management Plan 2.1 Scope It is proposed to construct two temporary bridges and three permanent bridges across Duck Creek within the Duck Creek North development to gain access across Duck Creek for both construction and permanent access once the lots are created there. This document is considered a draft and a final BCP will be prepared that address specific consent conditions and contractor construction methodology. 2.2 Permanent Bridges Description Three permanent bridges are required to gain access to all of the proposed lots in Duck Creek North. The proposed bridges are shown in Cardno Plans NZ PL-C411 to C Bridge 1 The proposed permanent Bridge 1 is located at the northern end of the site creating an access point on to James Cook Drive. The bridge will be 34m long and 9.6m wide and have two spans over a central pier. A bore hole has been drilled approximately 35m south of the western abutment of the bridge to confirm depth to solid rock for the piles. The test hole confirmed that good bearing rock was present approximately 6.6m below ground. As shown by the drawings, the abutments are clear of the 100 year 2090H flood event. A contractor will be engaged in late 2015 and will be required to adhere to the EMP(C) and will prepare in detail with reference to the granted consent conditions a site specific construction management plans for approval by GWRC prior to commencement of physical works. The construction of the bridge will also be the subject of a building consent (yet to be applied for) from PCC Bridge 2 The proposed permanent Bridge 2 is located between Stages 1 & 2 of the site below Observatory Close. The bridge will be 17m long and 8.5m wide. A bore hole has been drilled at the western abutment of the bridge to confirm depth to solid rock for the piles. The test hole confirmed that good bearing rock was present approximately 6.7m below ground. As shown by the drawings, the abutments are clear of the normal stream flow but will become inundated in higher flood events. The wingwalls and abutments will be designed to provide erosion protection to the stream banks and appropriately sized riprap will be used to protect the channel and abutment foundations against scour Bridge 3 The proposed permanent Bridge 1 is located at the northern end of the site creating an access point on to James Cook Drive. The bridge will be 17m long and 7.6m wide. The top of the deck slab will be at a minimum RL of 4.5m and the underside of the bridge deck will be at a minimum level of RL 3.6m. The existing high tide level at the bridge location in Duck Creek is RL 1m and the predicted water level for the 100 year event occurring in 2090 with a high climate change scenario is RL 3.1m. The bridge therefore has a clearance between the underside of the deck and the 100 year flood event for the 2090H predicted water level is 0.5m. A bore hole has been drilled approximately 35m south of the western abutment of the bridge to confirm depth to solid rock for the piles. The test hole confirmed that good bearing rock was present approximately 6.6m below ground. 8 September 2015 Cardno 32

38 As shown by the drawings, the abutments are clear of the normal stream flow but will become inundated in higher flood events. The eastern abutment will be affected by a 10 year flood event while the western abutment and shared footpath will be inundated in the 2090H flood event. The wingwalls and abutments for this bridge will be designed to provide erosion protection to the stream banks and appropriately sized riprap will be used to protect the channel and abutment foundations against scour Construction Methodology Example The bridge shall be constructed by the following method: 1. Survey set out of the bridge; 2. Install safety fencing around the construction area; 3. Install Super Silt Fences around the extent of the abutment works. No work shall take place beyond this delineation; 4. Site preparation; 5. True right bank - Drilling the foundation piles for the bridge abutments; 6. True right bank - - Placing of reinforcing cages and pouring concrete in 1m lifts for the foundation piles; 7. True left bank - Drilling the foundation piles for the bridge abutments and central pier for Bridge 1; 8. True left bank - Placing of reinforcing cages and pouring concrete in 1m lifts for the foundation piles; 9. Construct the abutments on each side of the bridge; 10. Placement of the deck beam structure and internal ducts; 11. Pouring the concrete bridge deck and kerbing; 12. Construct the wing walls at each of the 4 corners of the bridge where required; 13. Installing the guard rails on either side of the bridge; 14. Construction of bridge approaches as required including backfilling of the abutments; 15. Construct the settlement slabs on each side of the bridge and finish backfilling over the settlement slabs; The bridge construction will take a total of approximately weeks to complete assuming average weather patterns. The contractor shall ensure that no construction materials, wet concrete or concrete washwater enters any watercourse during, or as a result of the works. The Manager, Environmental Regulation, Wellington Regional Council, shall be notified immediately (within 12 hours) if any wet concrete or concrete washwater enters any watercourse. 2.3 Temporary Bridges Description Two temporary bridges are required during development to provide access across Duck Creek during the construction of the permanent bridges. The proposed bridge locations are shown in Cardno Plan NZ PL-C411. A further temporary bridge may also be provided off James Cook Drive and next to the construction of the permanent Bridge 1. This is an option to assist traffic management issues at SH58. The first temporary bridge is required to enable the transportation of machinery and material between Stages 1 & 2. This bridge will be constructed during the Stage 1 earthworks to enable the use of Stage 2 for stockpiling topsoil. It is anticipated that it will be in use for approximately two years while the earthworks, roading, services and permanent bridge 2 are constructed. Following the completion of permanent bridge 2 the first temporary bridge will be decommissioned and removed. The second temporary bridge will be located further south between Stages 3 & 4. This bridge is required to provide access to Stage 3 following completion of Stage 1 but prior to the completion of permanent bridge 3. 8 September 2015 Cardno 33

39 This bridge will be constructed at the start of the Stage 3 earthworks and it is anticipated that it will be in use for approximately 11 months while the earthworks, roading, services and permanent bridge 3 are constructed. Following the completion of permanent bridge 3 the first temporary bridge will be decommissioned and removed. The proposed temporary bridge (as used with previous stages in Duck Creek South) is 15.4m in length, 3m wide and has abutments set back from the stream edge by approximately 2m 3m, see Cardno Plan NZ PL-C420 for details. The underside of the bridge is well above the daily stream flow, and has sufficient freeboard to accommodate a reasonable storm event. The bridge is formed by steel beams creating a frame, holding up a single steel plate. The bridge abutments will be formed using concrete blocks, soil from on site and rock rip rap, with silt fences located between the abutment and the stream channel. The approximate area of earthworks for each bridge abutment and the approach road to the bridge is 70m 2 (14m long and 5m wide) giving a total earthworks area of approximately 140m 2, these areas are grade and elevation dependent. Silt fences will be installed between the abutments and Duck Creek to prevent sediment entering Duck Creek. These fences will be installed prior to the works commencing so that Duck Creek is protected during the construction of the temporary bridge foundations. They will remain in place and be monitored during the construction phase Methodology The installation of the bridge crossing shall be by the following methodology: 1. Install silt fences between bridge foundation pads and the stream as shown on Cardno Plan NZ PL-C420; 2. Construct the temporary bridges foundations; 3. Lift the temporary bridge frame into position; 4. Lift the steel plate surface of the bridge into place and fix it to the frame; 5. Install handrails to the surface of the temporary bridge; 6. Complete Earthworks, Roading, Services and Permanent Bridge construction via the bridge; 7. Decommission the temporary bridge; 8. Remove the temporary foundations with a digger; 9. Grass all exposed areas associated with the temporary access. No works shall take place in the bed of the stream while the temporary bridge is installed. 8 September 2015 Cardno 34

40 03 FLOCCULATION MANAGEMENT PLAN (FMP) 8 September 2015 Cardno 35

41 3 Flocculation Management Plan 3.1 Introduction This Flocculation Management Plan (FMP) has been prepared for the bulk earthworks at Duck Creek North, Whitby. Flocculation of the ponds is to be carried out under this Flocculation Management Plan. 3.2 Design and Management Flocculant and Dosage Rate The flocculant to be used on site shall be PAC type flocculant. RST Environmental Solutions completed testing of sample runoff water from samples of soil from the site in Duck Creek South, to determine the most appropriate flocculant for the site and the applicable dosage rates as part of the management of earthworks in the upstream catchments. It is anticipated that the previous does rates used on the site will be appropriate for Duck Creek North. However, prior to the construction of the earthworks, additional testing will need to be undertaken in accordance with Greater Wellington Regional Council guidelines to confirm that the dosing rates are appropriate for the soils on that area of the site. The performance of the ponds will be monitored and that might lead to some refinement of the dose rates Implementation and Application of Flocculant RST have determined that either a PAC system or HaloKlear system will work on this site. The flocculant can be added by rainfall activation via an inflow measurement. The flocculant will be stored securely inside the flocculation shed designed as per the Greater Wellington Regional Council Guidelines. RST has confirmed that an Electronic Dosing Device (EDD) would be the preferred system to use for this site. The system is flow activated so whilst there is water running in to the pond whether from rain fall or from a pump EDD will dose the water. It can add any type of flocculant system and can run dual polymers if necessary. EDD will also monitor rainfall on site and rainfall intensity and can measure the volume of water that passes through the pond. It can send a text message if any preset limits are reached or when the flocculant is low in the tank Add on s to the system include measuring total suspended solids at the inlet and outlet of the pond, pond ph plus there is provision to install other devices. EDD has telemetry so we can transmit live data to a web site. EDD s systems mean that it is very easy to calibrate for any catchment size or chemical dose rater. The monitoring system means that there is less maintenance or any requirement to check the ponds and the feedback system allows for easy management. The flocculant which is held in a separate tank next to the unit is pumped in to the water flow by a series of dose pumps. This then settles the sediment out of the water in the same way that the old system did. EDD has 2 x 12v battery packs in it which are recharged by a solar panel that run the PLC, sensor and dose pumps. The unit can dose several different flocculants at once if required. It monitors the amount of flocculant used and has sensors on the dose tanks which will advise when the level is low. EDD has plug in sensors that can measure water quality as the water runs through the weir and as it leaves the pond. It can measure but is not limited to total suspended solids (TSS), ph, temperature, flow rate volume of water treated. These are optional on any unit. All of this data is stored on the unit and can be down loaded on to a lap top or can be transmitted via cell phone back to a web site. It also has a warning function system that can transmit text messages to individuals when any pre-set limit is reached such as rain fall or tank low levels. 8 September 2015 Cardno 36

42 3.2.3 Initial Testing After the ponds are installed, the first rainfall event of [XXXXmm] peak intensity, or rainfall in which the pond discharges via the decant, will initiate sampling. Samples shall be taken from the inflow, pond and decant outlet (if a discharge occurs). Each sample shall be tested for the following parameters: > ph > temperature (pond only) > turbidity > suspended solids The results shall be recorded and the dosage rates of the flocculant shall be fine-tuned accordingly. An Advisory Note shall be submitted to Greater Wellington Regional Council within [XXXX] days, outlining the results and analysis of the testing. Testing of these parameters will be carried out after each subsequent rainfall event, and/or when a discharge occurs via the decant, as part of the overall ongoing site monitoring to achieve the best sediment control performance practicable Alternatives If monitoring of the ponds shows that the flocculation measures are not reducing sediment concentrations to the satisfaction of Greater Wellington Regional Council, then alternative flocculation measures shall be considered. The alternatives are: > Use of a dose pump to calculate the flow into the pond and release a measured dose of PAC flocculant; > Use of Magnasol as an alternative flocculant. The alternative methodology can be achieved within a day if practicable. 3.3 Environmental Triggers Although the pond will be actively managed until it is decommissioned at the completion of the earthworks, there may be a need to enhance sediment treatment prior to discharge if the discharge is likely to cause adverse environmental effects. If the ph of the pond drops below [XXXX] and/or if NTU values increase above [XXXX] in the pond discharge, then the following steps shall be undertaken: 1. Dosing of the pond shall cease immediately and Greater Wellington Regional Council shall be informed. It is the responsibility of both RST Environmental Solutions and the Client s Environment Manager to alert Regional Council. Greater Wellington Regional Council can be contacted on The management of the pond and surrounding sediment controls shall then be reviewed by both the Clients Environmental Managers representative and RST Environmental Solutions to ensure erosion of the soil is minimised and all practicable steps to improve the efficiency of the pond are being taken. If practicable, the pond decants shall be raised to store sediment runoff within the pond, rather than discharge over land downstream. The header tank will also be checked to see if it needs to be emptied, as this may cause overdosing of flocculant. 3. If the ph is below [XXXX], the pond may be dosed with lime to raise the ph levels back to neutral. This will be achieved by first determining the volume within the pond, to determine the dose rate for lime. 4. If there are high NTU levels in the main pond (above the average determined from previous testing) then, if practicable, the decants shall be raised to increase the dead storage in the pond and reduce the volume of discharge. 8 September 2015 Cardno 37

43 3.4 Monitoring and Maintenance Weekly Monitoring The following parameters will be monitored on a weekly basis with samples taken from the inflow, forebay, pond and decant outlet (if a discharge occurs): > temperature > ph; > turbidity (NTU); > dissolved aluminium is to be tested if an aluminium based flocculant is used (ie: PAC flocculant); > suspended solids (g/m³) (inflow and outflow only). The results shall be recorded. Routine monitoring shall continue until the sediment pond catchment has become completely stabilised. The testing equipment to be used on site is listed in Table 3-1 below. Table 3-1 Testing Equipment Parameter Testing Equipment Detection Limit Temperature ( C) Eutech 300 series ph meter -10 C C ph Eutech 300 series ph meter -2-16pH Turbidity (NTU) Hanna Portable turbidity meter 0 NTU 1,000 NTU Aluminium (g/ m 3 ) Rainfall Event Monitoring Sample to be sent to the laboratory (ELS) g/m 3 Automated notification is triggered by rainfall events of [XXXX] mm in one hour peak intensity (measured at the [XXXX] rain gauge) and/or a rainfall event that exceeds [XXXX] mm in a 24 hour period. This alert can be used to inspect the pond forebay and flume areas and, if necessary, clean out to maintain maximum storage capacity in the forebay. Any blocks, cages or flumes on the level spreader which have been damaged shall be removed and replaced. During the inspection the ponds will also be checked for integrity and effectiveness. Instructions to fix or remedy defects shall be given to the contractor as required. The following parameters will be monitored with samples taken from the inflow, forebay, pond and (if a discharge occurs) decant outlet: > ph > temperature (pond only) > turbidity (NTU) > dissolved aluminium (g/m3) > suspended solids (g/m³) The monitoring will be undertaken within 24 hours of notification as required in consent. The testing equipment to be used is listed in Table 3-2 below. Table 3-2 Rainfall Event Testing Equipment Parameter Testing Equipment Detection Limit Temperature ( C) ph Optical Dissolved Oxygen (%) AQUAMETER AM-200 Aquaprobe AP-2000 AQUAMETER AM-200 Aquaprobe AP-2000 AQUAMETER AM-200 Aquaprobe AP C C (±0.5 C) 0% 500% (±1%) 8 September 2015 Cardno 38

44 Turbidity (NTU) AQUAMETER AM-200 Aquaprobe AP NTU 3,000 NTU (±2%)) Total Suspended Solids (g/m 3 ) INSITE IG Model 35L Sensor 0 g/m 3 1,500 g/m 3 (±1% or ±2mg/L) If testing equipment varies from the above this will be detailed in the floc management plan submitted to GWRC for approval prior to construction The results will be recorded and sent to GWRC within 10 working days High rainfall contingency measures Arrangements are to be made for additional flocculant to be stored onsite in a locked shed to allow batch dosing of the ponds if the flocculant in the shed runs out and RST staff are unable to reach the site to refill the chemical reservoir. Batch dosing, if required, will only be undertaken by persons suitably trained to handle the flocculant. 3.5 Decommissioning The sediment ponds and other erosion control devices are to remain operational until the sediment pond catchments have become completely stabilised. Ponds cannot be removed until GWRC has signed off that the earthworks are complete and pond is ready to be decommissioned. Accumulated sediments from the ponds will be excavated. The sediments are not suitable as fill material, but may be mixed with other material to be used as topsoil. The flocculant sheds, decant manholes and flumes will be removed from the site and the ponds will be filled to design surface level. No measure will be removed without prior approval of the Manager, Environmental Regulation, GWRC. 3.6 Health and Safety Sampling Possible sampling locations are: > Inflow > Forebay > Pond > Discharge outlet into stream Sampling is to be carried out during daylight hours. Safe access shall be provided to the sampling locations identified above, or modified accordingly if access is identified as an issue following sampling Flocculant Handling Many flocculants are hazardous substance and precautions are required. Safety Data Sheets for the proposed flocculants will be supplied to the Contractor and shall be kept onsite at all times. All flocculant onsite shall be within the flocculant socks, or in a Chemical Reservoir within a locked flocculant shed. If a Chemical Reservoir is used then a small bund shall be created around the shed to contain spills Chemical Spills In the unlikely event of a chemical spill, the area shall be ventilated (if indoors) and RST Environmental Solutions shall be contacted. If there is a spill of PAC onto the ground it will be immediately contained using earth bunds to prevent it entering water. The spilt PAC should be recovered if possible and placed in polyethylene containers. If the spilt PAC cannot be recovered, it should be mixed with a volume of soil equal to at least ten times the volume of spilt PAC, and buried in dry soil. 8 September 2015 Cardno 39

45 If there is a spill of PAC into ponded water, discharge from the pond to natural water should be prevented. The ph of the water should be tested and if below ph5.8 treated with lime to increase the ph before discharge. If there is a spill of PAC into flowing water: > GWRC should be advised immediately. > The volume of the spill should be recorded. > If possible the water and spilt PAC should be pumped into a bund or pond until all the spilt PAC has been removed from the watercourse. > If the PAC cannot be removed from the watercourse any downstream users should be identified and advised. In association with GWRC an action plan will be developed. No chemicals shall be stored onsite, other than that contained in the chemical reservoir. A small bund will be constructed around the flocculation shed to ensure all spills are contained. The flocculation shed will have a Hazchem sign attached to the outside, with appropriate information clearly visible including a 24hr emergency phone number. Robert Coulson, RST Environmental Solutions Ltd, 06) or Plan Review There shall be meetings between the contract supervisor and the contractor as required to discuss works on site and management issues. In the event that it is identified that this plan is not providing sufficient management of the flocculation, a review of the Plan shall be undertaken accordingly. If deemed necessary a review of the plan shall be undertaken with consultation from all responsible persons listed in Section3.8 below. Plan updates are to be inserted into applicable appendix and a new revision of the Plan issued. 3.8 Persons Responsible Setting of the Flocculant including dosage rates Person Responsible: Robert Coulson, RST Environmental Solutions Ltd Contact Number: RST Environmental is responsible for installation of the flocculation measures and setting of the dose rate following testing. Initial and Weekly Pond Monitoring Person Responsible: Robert Coulson, RST Environmental Solutions Ltd Contact Number: RST Environmental is responsible for monitoring and maintenance of the flocculation measures on a weekly basis. Rainfall Event Monitoring Person Responsible: [Client Environmental Rep (or consultant)] Contact Number: [XXXX] [XXXX] is responsible for ensuring that monitoring the pond is undertaken following a rainfall triggered event. 8 September 2015 Cardno 40

46 Reporting to Greater Wellington Regional Council Person Responsible: [Client Environmental Rep (or consultant)] Contact Number: [XXXX] [XXXX] is responsible for reporting to Greater Wellington Regional Council as per the consent conditions and Management Plan requirements. 8 September 2015 Cardno 41

47 3.9 Material Safety Data Sheets INSERT MATERIAL SAFETY DATA SHEETS HERE 8 September 2015 Cardno 42

48 8 September 2015 Cardno 43

49 04 STREAM DIVERSION AND STREAM WORKS PLAN 8 September 2015 Cardno 44

50 4 Stream Diversion and Stream Works Plan 4.1 Introduction This Stream Diversion and Stream Works Plan has been prepared for the stream works to be undertaken as part of the development at Duck Creek North in Whitby. Design and Management 4.2 Stream Diversion The sections below outline the main steps to be undertaken at each stage of the stream diversion works Pre Diversion > Install applicable water diversion bunds and silt control fences > Construct new creek high flow channel > Inspection by Engineer and Ecologist > Set out and construct low flow meander > Confirm Riffle/Run/Pool locations > Construction low flow creek > Inspections by Engineer and Ecologist during construction > Creek Asbuilts > Stabilisation (Flex-Terra and Applicable Matting) > Ecologist advisory notice to GWRC confirming suitability for fish passage Diversion > Remove downstream coffer dam > Divert creek into new alignment > Fish capture and reporting of old alignment by Ecologist > Transfer of creek gravels from existing channel to new creek bed at direction of Ecologist Post Diversion > Associated inspections and post diversion reporting to GWRC > Ongoing consenting requirement with respect to diversion 4.3 Stream Bank Remedial Works The locations identified for channel stabilisation or erosion protection shown on Cardno Plan NZ PL- C251 have been identified as areas of risk from the flood modelling; see the flood modelling report for more detail. This work involves lining the channel bed and sides with rock armouring wrapped in a geotextile. This will be keyed in at the bed with a 1 m gravel substrate place within the bed. The rock will be placed from the bed of the stream up to top of the banks and covered in a layer of topsoil. In locations where the banks are incised/undermined these will be battered back to an appropriate slope prior to armouring and stabilisation. 8 September 2015 Cardno 45

51 APPENDIX A DRAWING SET 8 September 2015 Cardno 46

52 REFER TO PROVIDED PLAN SET. PLANS WILL BE INSTERED IN THIS APPENDIX FOR ISSUE TO CONTRACTOR. 8 September 2015 Cardno 47

53 APPENDIX B EROSION AND SEDIEMENT CONTROL CALCULATIONS 8 September 2015 Cardno 48

54 8 September 2015 Cardno 49

55 APPENDIX C ENVIRONMENTAL EFFECTS REGISTER 8 September 2015 Cardno 50

56 CONSTRUCTION ACTIVITY Establishment onsite Bulk Earthworks including excavation of unsuitable and cut material, mixing and placement of fill Bridge and Culvert works ASPECT OF CONSTRUCTION Clearing and grubbing Topsoil removal Maintenance and refuelling of plant Sediment runoff into water courses Application of flocculation to sediment ponds Dust Haul Road Works within the active stream bed IMPACT Destroying native vegetation Erosion and sediment runoff CONTROL MEASURES - Set-out of earthworks to include limits of vegetation clearance - Site inductions - Install sediment controls prior to beginning associated earthworks operation Fuel spill into Duck Creek - Ensure all areas for storing and refuelling machinery are adequately bunded Smothering stream beds Damage to stream and harbour ecology Damage to neighbouring properties Contaminated discharge into water courses Nuisance to neighbouring properties Dust on roads Source of Dust Noise Loss of habitat Sedimentation - Follow the Earthworks Construction Plan (ECP) and actively manage the site in consultation with Cardno and Council - Frequent monitoring and maintenance - Have water cart available onsite at all times - Stabilised construction entrance - Watch weather forecast and dampen dry dust prone areas when windy days are forecast. - Stockpile material away from site boundaries - Establish ground cover as soon as levels are on grade - Water cart available onsite at all times for wetting dust sources as required - Vehicles shall not be overloaded - Working hours governed in EMPC - Isolate work area using sheet piling and sediment controls 8 September 2015 Cardno 51

57 APPENDIX D FLOCCULATION MANAGEMENT PLAN UPDATES 8 September 2015 Cardno 52

58 INSERT FLOC MANAGEMENT PLAN UPDATES HERE 8 September 2015 Cardno 53

59 APPENDIX E PRE CONSTRUCTION CHECK LIST 8 September 2015 Cardno 54

60 8 September 2015 Cardno 55

61 APPENDIX F EROSION & SEDIMENT CONTROL ASBUILT DOCUMENTATION 8 September 2015 Cardno 56

62 INSERT EROSION AND SEDIMENT CONTROL ASBUILT DOCUMENTATION HERE 8 September 2015 Cardno 57

63 APPENDIX G EARTHWORKS CONSTRUCTION PLAN VARIATIONS 8 September 2015 Cardno 58