Infrastructure and Services Agenda - AGENDA
NOTICE OF MEETING
Notice is hereby given of the Meeting of the Infrastructure and Services Committee to be held in the Council Chamber, First Floor, Civic Administration Building, 101 Esk Street, Invercargill on Monday 25 February 2019 at 4.00 pm
Sir T R Shadbolt, KNZM JP Cr L S Thomas (Chair) Cr I R Pottinger (Deputy Chair) Cr A J Arnold Cr K F Arnold Cr A H Crackett Cr I L Esler
EIRWEN HARRIS MITCHELL MANAGER, SECRETARIAL SERVICES
Finance and Corporate Services Directorate Civic Administration Building ∑ 101 Esk Street ∑ Private Bag 90104 Invercargill ∑ 9840 ∑ New Zealand DX No. YA90023 ∑ Telephone 03 211 1777 ∑ Fax 03 211 1433
1 Infrastructure and Services Agenda - AGENDA
Council’s Values:
Responsibility Take ownership of decisions and outcomes, both collectively and individually. ∑ We willingly share our knowledge. ∑ We acknowledge our mistakes, work to resolve them and learn from them. ∑ We give and receive feedback in a constructive manner to resolve issues. ∑ We do our job with total commitment.
Respect Everyone is important, as are their views. ∑ We support and care for each other. ∑ We stop to listen, learn and understand. ∑ We communicate in an honest, up-front and considerate manner. ∑ We maintain confidences and avoid hurtful gossip.
Positivity Always look on the bright side of life. ∑ We are approachable, interested and friendly. ∑ We are open and receptive to change. ∑ We acknowledge and praise the efforts of others. ∑ We work together as a team to get the job done.
Above and Beyond Take opportunities to go the extra mile. ∑ We take the initiative to improve our work practices to get the best results. ∑ We challenge ourselves and each other to make it better. ∑ We take pride in providing the best possible outcomes. ∑ We are ambassadors for our Council at all times.
Council’s Vision for the City:
Enhance our City and preserve its character, while embracing innovation and change.
Council’s Vision:
We are an energised, fun and innovative team that makes it better for each other and our community.
Council’s Mission:
Making it better by making it happen.
2 Infrastructure and Services Agenda - AGENDA
A G E N D A
Page
2. APOLOGIES
3. PUBLIC FORUM
3.1 WATER QUALITY OF THE NEW RIVER ESTUARY
Mr Corey Vreugdenhil will be in attendance to speak to this item.
4. INTEREST REGISTER 6
12 5. MINUTES OF MEETING HELD ON 3 DECEMBER 2018
6. MONITORING OF SERVICE PERFORMANCE
6.1 LEVELS OF SERVICE 17
6.1.1 Parks and Reserves 17
6.1.2 Public Toilets 18
6.1.3 Roading 18
6.1.4 Sewerage 25
6.1.5 Solid Waste Management 29
6.1.6 Stormwater 30
6.1.7 Water Supply Activity 34
7. DEVELOPMENT OF POLICIES/BYLAWS
7.1 AMENDMENTS TO BYLAWS DUE TO FIRE AND EMERGENCY NEW 39 ZEALAND LEGISLATIVE CHANGES
7.2 TEMPORARY AMENDMENT TO BYLAW FOR TRAFFIC CHANGES 43 DURING ILT HOTEL SITE DEMOLITION WORKS
8. ACTION SHEET 46
9. TEMPORARY ROAD CLOSURES 47
3 Infrastructure and Services Agenda - AGENDA
10. UNDERGROUND WATER SUPPLY EXPLORATION FOR 50 EMERGENCY ALTERNATIVE SOURCE
10.1 APPENDIX 1 54
11. OMAUI RESERVE EASEMENT 93
11.1 APPENDIX 1 96 11.2 APPENDIX 2 99 11.3 APPENDIX 3 100
12. STORAGE BUILDING ON RACECOURSE ROAD 108
13. URGENT BUSINESS
14. PUBLIC EXCLUDED SESSION
Moved, seconded that the public be excluded from the following parts of the proceedings of this meeting; namely
(a) Minutes of meeting held on 3 December 2018
The general subject of each matter to be considered while the public is excluded, the reason for passing this resolution in relation to each matter, and the specific grounds under Section 48(1)(d) of the Local Government Official Information and Meetings Act 1987 for the passing of this resolution are as follows:
General subject of Reason for passing this Ground(s) under each matter to be resolution in relation to Section 48(1) for the considered each matter passing of this resolution
(a) Minutes of Enable any local authority Section (7)(2)(i) meeting held on holding the information to 3 December carry on, without prejudice 2018 or disadvantage, negotiations (including commercial and industrial negotiations).
4 Infrastructure and Services Agenda - AGENDA
(b) Contract 845 – Enable any local authority Section (7)(2)(i) Windsor Street holding the information to Drainage carry on, without prejudice Renewal or disadvantage, negotiations (including commercial and industrial negotiations).
**********
5 Infrastructure and Services Agenda - INTEREST REGISTER
INVERCARGILL CITY COUNCIL ELECTED MEMBERS INTEREST REGISTER
ELECTED MEMBERS NAME ENTITY INTERESTS PROPERTY RONALD LINDSAY ABBOTT Invercargill City Council Councillor Kiwi-Pie Radio 88FM Invercargill Director / Broadcaster Invercargill Art Gallery Council Representative / Board Invercargill Venues and Events Member Management Director REBECCA RAE AMUNDSEN Invercargill City Council Councillor Arch Draught Ltd Director BP Orr Ltd Director Task Ltd Director Arts Murihiku Trustee Dan Davin Literary Foundation Trustee/Chair Heritage South Contractor Glengarry Community Action Events Co-ordinator (Volunteer) Group SMAG Board Council Representative Venture Southland Council Representative Southland Regional Heritage Council Representative Committee
Members Interest Register7 February 2019
6 Infrastructure and Services Agenda - INTEREST REGISTER
INVERCARGILL CITY COUNCIL ELECTED MEMBERS INTEREST REGISTER
ALLAN JAMES ARNOLD Invercargill City Council Councillor Ziff’s Café Bar Ltd Executive Director Buster Crabb Ltd Executive Director Ziff’s Tour Ltd Executive Director Ziff’s HR Ltd Executive Director Ziff’s Trust Trustee Administrator NZMCA Member Southland Aero Club Member Invercargill Club Member Invercargill East Rotary Member KAREN FRANCES ARNOLD Invercargill City Council Councillor Electricity Invercargill Ltd Director Powernet Ltd Director Pylon Ltd Director Invercargill Creative Communities Funding Scheme Trustee/Chair Southland Warm Homes Trust Trustee
TONI MARIE BIDDLE Invercargill City Council Councillor Invercargill Venue and Events Director Management Limited Southland Museum and Art Gallery Trustee Trust Board McIntyre and Dick Partner – Executive Team
Members Interest Register7 February 2019
7 Infrastructure and Services Agenda - INTEREST REGISTER
INVERCARGILL CITY COUNCIL ELECTED MEMBERS INTEREST REGISTER
ALEX HOLLY CRACKETT Invercargill City Council Councillor High Street Ride Southland Chair Invercargill Southland Youth Futures Advisory Chair Board Venture Southland and Sub Council Representative Committee Women in Sport Murihiku Trustee IRWIN LLOYD ESLER Invercargill City Council Councillor Bluff Community Board Council Representative Bluff Maritime Museum Council Representative Otatara Landcare Group Member GRAHAM DAVID LEWIS Invercargill City Council Councillor Invercargill City Holdings Limited Director Southland Indoor Leisure Centre Trustee Charitable Trust Bluff 2024 Rejuvenation Officer Invercargill Community Recreation Trustee & Sports Trust Hospice Southland Trustee
Members Interest Register7 February 2019
8 Infrastructure and Services Agenda - INTEREST REGISTER
INVERCARGILL CITY COUNCIL ELECTED MEMBERS INTEREST REGISTER
DARREN JAMES LUDLOW Invercargill City Council Councillor 770 Queens Drive Radio Southland Manager Invercargill Invercargill City Holdings Limited Director Invercargill Venue and Events Director / Chairman Management Southland Museum and Art Gallery Trustee Trust Board Healthy Families Invercargill Board Member Murihiku Maori Wardens Board Member Southland Community Law Centre Board Member IAN REAY POTTINGER Invercargill City Council Councillor 171 Terrace Street Southland Electronics Limited Director Invercargill 9810 Santa Parade Organiser Alice Pottinger (Wife) TIMOTHY RICHARD Invercargill City Council Mayor SHADBOLT Invercargill Airport Limited Director Kiwi Speakers Limited Director SIT Ambassador Contractor
Members Interest Register7 February 2019
9 Infrastructure and Services Agenda - INTEREST REGISTER
INVERCARGILL CITY COUNCIL ELECTED MEMBERS INTEREST REGISTER
LESLEY FRANCES SOPER Invercargill City Council Councillor 137 Morton Street Breathing Space Southland Trust Chair Strathern (Emergency Housing) Secretary/Treasurer Invercargill Omaui Tracks Trust Member National Council of Women (NCW) Active Communities Chair/Trustee 24 Margaret Street Invercargill Public Art Gallery Board Member Richmond Citizens Advice Bureau Board Member Invercargill Southland ACC Advocacy Trust Employee LINDSAY STEWART Invercargill City Council Councillor THOMAS Invercargill City Holdings Limited Director Invercargill City Property Limited Director HWCP Management Limited Director
Members Interest Register7 February 2019
10 Infrastructure and Services Agenda - INTEREST REGISTER
INVERCARGILL CITY COUNCIL ELECTED MEMBERS INTEREST REGISTER
EXECUTIVE STAFF NAME ENTITY INTERESTS PROPERTY PAMELA GARE Invercargill City Council Director of Environmental and Planning Services DJ & PM Gare Family Trust Trustee
CLARE HADLEY Invercargill City Council Chief Executive
CAMERON MCINTOSH Invercargill City Council Director of Works and Services
DAVID FOSTER Invercargill City Council Acting Director of Finance and Corporate Services Executive Director Foster and Associates Ltd
Members Interest Register7 February 2019
11 Infrastructure and Services Agenda - MINUTES OF MEETING HELD ON 3 DECEMBER 2018
MINUTES OF A MEETING OF THE INFRASTRUCTURE AND SERVICES COMMITTEE HELD IN THE COUNCIL CHAMBER, FIRST FLOOR, CIVIC ADMINISTRATION BUILDING, 101 ESK STREET, INVERCARGILL ON MONDAY 3 DECEMBER 2018 AT 4.00 PM
PRESENT: His Worship the Mayor Mr T R Shadbolt Cr L S Thomas – Chairperson Cr I R Pottinger – Deputy Chairperson Cr K F Arnold Cr A H Crackett (by conference call) Cr I L Esler
IN ATTENDANCE: Cr L F Soper Cr T M Biddle Mr R Fife – Chairman Bluff Community Board Mrs G Henderson – Bluff Community Board Mr R Pearson – Roading Manager Mr J Rees - Manager Engineering Services Mr P Horner – Building Assets Manager Mr R Keen – Manager 3 Waters Ms M Brook - Manager Strategy and Policy Mr M Loan - Manager - Drainage and Solid Waste Ms L McCoy - Building Assets Administration Ms L Kuresa – Governance Officer
1. APOLOGIES
Cr A J Arnold and Cr K F Arnold for lateness.
Moved Cr Pottinger, seconded Cr Esler and RESOLVED that the apologies be accepted.
2. PUBLIC FORUM
2.1 Teviot Street Reserve
Kaye Fraser was in attendance to speak to this item.
Ms Fraser thanked Council for saving the Teviot Street Reserve and outlined how it was utilised during the last year. Over a year ago they had planned to have seating for the elderly and everyone who used the reserve, some goal posts and multi-sport equipment to give the area better usage as well the building being painted. As a community, they did not know how to access funding to do anything to the reserve. The community needed some assistance to make these wishes a reality but they were at a loss as to who they could liaise with to assist in this area. The community was willing to put in time, labour and skills to assist in the work to make the reserve user-friendly for everyone.
The Committee made the following suggestions for Ms Fraser to investigate for funding options: ∑ South Alive – to see if it was a project they may see as part of the improvement of South City. ∑ Neighbourhood Fund – speak to Ms Brook at Council about this funding.
12 Infrastructure and Services Agenda - MINUTES OF MEETING HELD ON 3 DECEMBER 2018
∑ Community funding and reserve money set aside for reserves.
After further discussions it was agreed that seating for the reserve was discussed last year as part of the costs, because seating was Council’s responsibility. It was also disappointing that Sport Southland had put the Teviot Street Reserve in its community outcomes as a project. Sport Southland should have progressed this further. It was also agreed that Ms Fraser would speak to Ms Brook about the Neighbourhood Fund.
Cr Thomas thanked Ms Fraser for taking the time to present to the Committee.
2.2 Bluff Transfer Station
Raymond Fife, Chair of the Bluff Community Board was in attendance to speak to this item.
Mr Fife reported that the Bluff community was not happy after this matter was reported in The Southland Times last Saturday. He tabled a paper outlining the Board’s concerns and took the meeting through it.
In response to questions, the following answers were given:
∑ Some of the proposed hours can be changed to suit the people in the community. ∑ The Board believes that there is still a need for a solid waste station in Bluff. ∑ The Board was made aware that there would be a media release on this matter last Friday.
Cr Thomas thanked Mr Fife for taking the time to voice the Board’s concerns on this matter.
3. INTEREST REGISTER
There were no changes to the Interest Register.
4. MINUTES OF THE MEETING HELD ON 29 OCTOBER 2018
Moved Cr Pottinger, seconded Cr Esler and RESOLVED that the minutes be adopted.
5. MONITORING OF SERVICE PERFORMANCE
5.1 Levels of Service
Moved Cr Esler, seconded Cr Pottinger and RESOLVED that the report be received.
13 Infrastructure and Services Agenda - MINUTES OF MEETING HELD ON 3 DECEMBER 2018
6. ACTION SHEET
Cr Thomas reported that he had raised the issue of unsealed roads with the Chairman of Finance and Policy and he would follow that up with him again tomorrow.
Note: The Committee agreed that the Teviot Street Reserve be added to the Action Sheet.
7. CCTV UPDATE
The report had been circulated and Mr Pearson took the meeting through it.
In response to questions, the following answers were given:
∑ There are a large number of older analogue cameras which the Police have said are not necessarily delivering the picture quality, so some of those are relatively straight forward upgrades that need to be done. There were other options through the inner city redevelopment, Council is attaching onto existing locations. The development gives Council an opportunity to add extras depending on where the entranceways are located. ∑ The consultant was useful to bring that independent industry expertise to Council to identify those areas where Council needs to focus and how to bring three systems together. His cost is not large, compared to the budget that was anticipated. ∑ The consultant’s experience has been in a number of places including the Defence Force so he has done reasonably large installations.
Moved His Worship the Mayor, seconded Cr Esler and RESOLVED that it be RECOMMENDED to Council that the CCTV Update is endorsed;
AND THAT
Funding for this project is confirmed to be from Roading Renewals areas.
8. CONTRACT 803 – ELECTRICAL AND MECHINAL UTILITY MAINTENANCE 2018
The report had been circulated and Mr Keen took the meeting through it.
Moved Cr Esler, seconded Cr Pottinger and RESOLVED that it be RECOMMENDED to Council that the consideration of awarding Contract 803 be referred to Council;
AND THAT
The existing contract be extended out until 1 March 2019 to allow the new contract to be put in place.
14 Infrastructure and Services Agenda - MINUTES OF MEETING HELD ON 3 DECEMBER 2018
9. FUTURE STATE OF THE THREE WATERS SYSTEM – REGULATIONS AND SERVICE DELIVERY
The report had been circulated and Mr Loan took the meeting through it.
∑ The matter was discussed with Mr Horrell and he was still unsure as to what the outcomes might be. ∑ Councils will give their Chief Executives direction of how this is progressed. Council also needs to wait until June 2019 to see the preferred options that the Government may put out for consultation.
Moved Cr Pottinger, seconded Cr Esler and RESOLVED that the report be received;
AND THAT
It be RECOMMENDED to Council that Council continues to receive notification of the reports by Cabinet in respect to regulation; service delivery arrangements; economic regulation; and oversight and stewardship, as it relates to the Three Waters provision.
10. URGENT BUSINESS
Nil.
11. PUBLIC EXCLUDED SESSION
Moved Cr Pottinger, seconded Cr Esler and RESOLVED that the public be excluded from the following parts of the proceedings of this meeting, namely:
(a) Bluff Transfer Station (b) Minutes of meeting held on 29 October 2018 (c) Contract 742 – Mersey Street Foulsewer Renewal (d) Contract 833 – Inner City Water Main Renewal (Tay/Clyde/Dee Streets) (e) Contract 843 – Melbourne Stormwater Renewal
General subject of Reason for passing this Ground(s) under each matter to be resolution in relation to Section 48(1) for the considered each matter passing of this resolution
(a) Buff Transfer Enable any local authority Section 7(2)(i) Station holding the information to carry on , without prejudice or disadvantage, negotiations (commercial and industrial negotiations)
15 Infrastructure and Services Agenda - MINUTES OF MEETING HELD ON 3 DECEMBER 2018
(b) Minutes of meeting Enable any local authority Section 7(2)(i) held 29 October holding the information to 2018 carry on , without prejudice or disadvantage, negotiations (commercial and industrial negotiations)
(c) Contract 742 - Enable any local authority Section 7(2)(i) Mersey Street holding the information to Foulsewer Renewal carry on , without prejudice or disadvantage, negotiations (commercial and industrial negotiations)
(d) Contract 833 - Enable any local authority Section 7(2)(i) Inner City Water holding the information to Main Renewal carry on , without (Tay/Clyde/Dee prejudice or Streets) disadvantage, negotiations (commercial and industrial negotiations)
(e) Contract 843 - Enable any local authority Section 7(2)(i) Melbourne holding the information to Stormwater carry on , without Renewal prejudice or disadvantage, negotiations (commercial and industrial negotiations)
There being no further business, the meeting finished at 5.27 pm.
**********
16 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: MELISSA BROOK, STRATEGY AND POLICY MANAGER
MEETING DATE MONDAY 25 FEBRUARY 2019
MONITORING OF SERVICE PERFORMANCES
SUMMARY
Reporting on the Infrastructure and Services levels of service measures for the period comprising 1 July 2018 to 31 December 2018.
RECOMMENDATIONS
That the report be received.
IMPLICATIONS
1. Has this been provided for in the Long-term Plan/Annual Plan? The report monitors performance in relation to levels of service measures identified in the Long-term Plan and the Annual Plan. 2. Is a budget amendment required? No. 3. Is this matter significant in terms of Council’s Policy on Significance? No. 4. Implications in terms of other Council Strategic Documents or Council Policy? No. 5. Have the views of affected or interested persons been obtained and is any further public consultation required? No. 6. Has the Child, Youth and Family Friendly Policy been considered? Yes.
FINANCIAL IMPLICATIONS
No financial implications arise from this report.
PARKS AND RESERVES
Major maintenance on parks including roading, path work and turf is on target for completion. Chinese Garden’s scope of work within targeted budget is being investigated.
17 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
PUBLIC TOILETS
1 July 2017 1 July 2018 to 31 December to 31 December 2017 2018 Access to Services Automated toilets are available 24 hours a day. 95% 96%
ROADING
1 July 2017 1 July 2018 to 31 December to 31 December 2017 2018 Traffic Signs and Signals Vandalised / missing signs and maps are 95% 80%1 promptly responded to within 48 hours. Traffic signals are responded to within one hour 100% 100% for emergency works, four hours for serious faults and 12 hours for minor faults. Response to Service Requests The percentage of customer service requests Monthly Monthly relating to roads and footpaths to which the Cumulative Result Cumulative Result territorial authority responds within the timeframe 73.42% 75.75% specified in the Long-term Plan. (LTP Measure 75% within 5 days) * Responded to means that the contractor has been notified and has visited the site to ensure it is made safe for use by traffic and pedestrians. 1 During the later months of 2018, the contractor changed the subcontractor relationship which meant a longer response time whilst the new staff got up to speed. Additionally, the numbers of faults are relatively small (i.e. less than five per month) so any task less than the target has a greater impact.
Programme of Works
Roading
Street Start Finish Activity Status Progress 2018/19 to 31 Annual Plan December 2018 Auburn Rd Racecourse Rd No Exit Chipseal Planned Completed Bain St Start Seal Ball St Chipseal Planned Completed Baxter St No Exit Drury Lane Chipseal Planned Completed Chesney St Maher St Ball St Chipseal Planned Completed Conon St Balmoral Drive Tweed-Conon Chipseal Carry forward Completed Roundabout Cunningham Cres Cunningham St Cunningham St Chipseal Planned Completed (Sth End) (Nth End) Cunningham St Bay Rd No Exit Chipseal Planned Completed Dipton St Elles Rd Bain St Chipseal Planned Completed Earn St Nith St Conon St Chipseal Planned Completed
18 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Street Start Finish Activity Status Progress 2018/19 to 31 Annual Plan December 2018 Eldon St David St Inglewood Rd Chipseal Planned Planned Elizabeth St Sh.1S Elles Road Chipseal Planned Completed Ettrick St Clyde St Nith St Asphalt Planned Completed Ettrick St Nith St Conon St Chipseal Planned Completed Ferry Rd Seal Start Seal End Chipseal Planned Completed (Fosbender (Fosbender Bridge) Bridge) Ferry Rd Seal Start (Oreti Seal End (Oreti Chipseal Planned Completed River) River) Gladstone Tce Grey St Queens Drive Chipseal Planned Completed Heywood St No Exit Ross St Chipseal Planned Completed Kennington Oteramika Rd Rimu Rd Chipseal Planned Completed Waimatua Rd Kew Rd Bluff Highway Elles Rd Chipseal Planned Completed Sh1 Kilmarnock Pl Kilmarnock Ave End Chipseal Planned Completed Lindisfarne St Tweed St St. Andrew Street Chipseal Planned In Progress Lithgow Pl East Lithgow St End Chipseal Planned Completed Lithgow Pl West Lithgow St End Chipseal Planned Completed Lithgow St Tay St Yarrow St Chipseal Planned Completed Maher St Chesney St SH 92 (Sealed Chipseal Planned Completed (Sealed End) End) Manse St Start Elles Rd Chipseal Planned Completed Mckellar Rd Oteramika Rd No Exit Chipseal Planned Completed Miller St Tweed St Tweed St Chipseal Planned Completed Motu Rimu Rd Wilson Rd Sth Spriggs Rd Chipseal Planned Completed Ness St Kew Rd O'Hara St Chipseal Planned Completed Nith St Forth St Tay St Asphalt Carry forward Completed Oreti St Elles Rd Bain St Chipseal Planned Completed Palmer St Heywood St End Chipseal Planned Completed Paterson St Bay Rd Renfrew St Chipseal Planned Completed Racecourse Rd Layard St End Chipseal Planned Completed Rockdale Rd Sh.92 Tramway Rd Chipseal Planned Completed Scott St Elles Rd Mcquarrie St Chipseal Planned Planned Stapleton St Oreti St Dipton St Chipseal Planned Completed Sycamore Pl Gladstone Tce No Exit Chipseal Planned Completed Tanner St Heywood St Baxter St Chipseal Planned Completed Teviot St Elles Rd Princes St Chipseal Planned Completed Totara St Conyers St End Chipseal Planned Completed Wagner St Stirrat St Waiau Crescent Chipseal Planned Completed Wall St Paterson St No Exit Chipseal Planned Completed Rockdale Rd East Bridge Tay St Rehabilitation Planned Completed Rockdale Rd West Bridge Tay St Rehabilitation Planned Completed Tweed St South Lime St Inglewood Rd Rehabilitation Planned Planned Tweed St South Nelson St Pomona St Rehabilitation Planned Planned
19 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Roading Programme – Urban
20 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Roading Programme – District
21 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Programme of Works
Footpaths
Street Start Finish Activity Status Progress to 2018/19 31 Annual Plan December 2018 Argyle St End Paisley St Concrete Planned Planned Argyle St End Paisley St Concrete Planned Planned Boyne St Wicklow End Concrete Planned Planned Burns St End Paisley St Concrete Planned Planned Burns St End Paisley St Concrete Planned Planned Crawford CUL #1 Crawford St End Concrete Planned Deferred Crawford CUL #1 Crawford St End Concrete Planned Deferred Crawford CUL #2 Crawford St End Concrete Planned Deferred Crawford CUL #2 Crawford St End Concrete Planned Deferred Crawford Loop Crawford St Sth Crawford St Nth Concrete Planned Deferred Crawford St James St Lyon St Concrete Planned Deferred Crawford St James St Waverly St Concrete Planned Deferred Drury Lane Bay Rd Heywood St Concrete Planned Planned Duke St Russel St Grey St Concrete Planned Completed Duke St Grey St Park St Concrete Planned Completed Elles Rd East Bridge North Ball St Concrete Planned Planned Eye St Nith St Conon St Asphalt Planned Completed Herbert St North Ward St Racecourse Rd Concrete Planned Completed Isabella St Tay St Surrey Park Concrete Planned Completed Isabella St James St St Andrew St Concrete Planned Completed James St Isabella St Crawford St Concrete Planned Completed James St Isabella St Crawford St Concrete Planned Completed King St Windsor St Ure St Concrete Planned Planned Lime St Center St Tweed St Concrete Planned Completed Lindisfarne St Baird St Yarrow St Concrete Planned Completed Metzger St Dome St Tweed St Concrete Planned Completed Ness St Balmoral Dv Earn St Concrete Carry Planned forward Onslow St (Bluff) Gore St SH1 Barrow St Concrete Planned Completed Onslow St (Bluff) Gore St SH1 Barrow St Concrete Planned Completed Paisley St End Dunbeath Crs Concrete Planned Planned Paisley St End Dunbeath Crs Concrete Planned Planned Pomona St Jenkin St Martin St Concrete Planned Planned Salford St Cruickshank Crs Moana St Concrete Carry Planned forward Spey St Deveron St Jed St Asphalt Planned Planned St Andrew St North Ward St Racecourse Rd Concrete Planned Planned St Andrew St Waverly St Racecourse Rd Concrete Planned Planned South Sycamore Pl Gladstone Tce End Concrete Planned Completed Sycamore Pl Gladstone Tce End Concrete Planned Completed Tweed St South Lime St Inglewood Rd Concrete Planned Completed Venus St Hamilton St Beatty St Concrete Planned Planned Wicklow St Boyne St Stirrat St Concrete Planned Planned
22 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Footpath Programme – Urban
23 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Footpath Programme – District
24 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
SEWERAGE
1 July 2017 1 July 2018 to 31 December to 31 December 2017 2018 System and Accuracy Sewerage. System Adequacy. Number of dry Annual Measure Annual Measure weather sewerage overflows. 0.40 0.29 The number of dry weather sewerage overflows from the Invercargill City Council’s sewerage system, expressed per 1000 sewerage connections to that sewerage system (LTP Target 2018/19 ≤ 4 blockages per 1000 properties annually) Discharge Compliance Sewerage. Discharge Compliance. Compliance Achieved Achieved with the Council's resource consents for discharge from its sewerage system. Compliance with the Council’s resource consents for discharge from its sewerage system measured by the number of: ÿ Abatement Notices ÿ Infringement Notices ÿ Enforcement Orders ÿ Convictions received by Council in relation to those resource consents. (LTP Target 2018/19 – 100% compliance) Customer Satisfaction The total number of complaints received by Council about any of the following: ÿ Sewerage - Customer Satisfaction. Number 0 0 of complaints received by Council about sewerage odour. (LTP Target 2018/19 – 0 complaints per year) ÿ Sewerage - Customer Satisfaction. Number of complaints received by Council about its 1.26 0.69 sewerage system faults and blockages. (LTP Target 2018/19 - <4 blockages per 1000 connections per year) The Council’s response to issues with its sewerage system, expressed per 1000 connections to Council’s sewerage system. Fault response times Where the Council attends to sewerage overflows resulting from a blockage or other fault in the Council’s sewerage system, the following median response times measured: ÿ Attendance time – from the time Council receives notification to the time that service personnel reach the site. ÿ Resolution time – from the time that Council receives notification to the time that service personnel confirm resolution of the blockage or fault.
25 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Priority Target Sewerage - Emergency 1 hour 87.50% 93.33% Response Attendance (LTP Target 2018/19 Not achieved Achieved Time - 1 hour target – 90% compliance) (median = 20 minutes) Sewerage - Emergency 6 hours 95.83% 95.56% Resolution Time - 6 Hours (LTP Target 2018/19 Achieved Achieved (Target 90%) – 90% compliance) (median = 58 minutes) Sewerage - Urgent 4 hours 89.19% 93.75% Response Attendance (LTP Target Not achieved Achieved Time - 4 hour target 2018/19 – 90% (median = 37 compliance) minutes) Sewerage - Urgent 24 hours 89.19% 93.75% Resolution Time - 24hour (LTP Target Not achieved Achieved target 2018/19 – 90% (median = 1 hour compliance) and 16 minutes)
Programme of Works
Pipeworks
Status 2018/19 Progress to Street Start Finish Activity Annual Plan 31 December 2018 Tay Street Nith Street Doon Street Renewal Carry forward Completed Mersey Street Otepuni Stream Spey Street Relining Carry forward In Progress John Street Metzger Street Saturn Street Renewal Planned In Progress St. Andrew Isabella Street Ritchie Street Renewal Planned In Progress Street Newcastle Antrim Street Queens Drive Renewal Planned Planned Street
Pump Stations / Reservoirs
Status 2018/19 Progress to 31 Location Activity Annual Plan December 2018 Lindisfarne St Foulsewer Electrical Upgrade include PLC Carry forward Planned Pump Station Preston St Foulsewer Pump PLC and Flow meter Carry forward In Progress Station
Waste Water Treatment Plant
Status 2018/19 Progress to 31 Location Activity Annual Plan December 2018 Clifton WWTP Digester 1 and 2 lid replacement Carry forward In Progress and screening equipment
26 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Sewerage Works Programme – Urban
27 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Sewerage Works Programme – District
28 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
SOLID WASTE MANAGEMENT
Alternative Solid Waste Disposal Practices Increasing use of alternative disposal practices (Cleanfill, green waste and recyclable material.) (LTP measure)
Graph of Solid Waste Disposal
29 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
STORMWATER
1 July 2017 1 July 2018 to 31 to 31 December December 2017 2018 System Adequacy Number of flooding events that occur in the Invercargill City Zero storms Zero storms district and for each flooding event the number of habitable were recorded were recorded floors affected. in Invercargill in Invercargill The number of flooding events that occur in the Invercargill City District. No City District. City district. habitable floors Zero habitable (LTP Target 2018/19 – Zero habitable floors affected per were affected. floors were 1000 properties during any five year return storm.)* flooded.
Discharge Compliance Stormwater Discharge Compliance. Compliance with the Yes Yes Council's resource consents for discharge from its stormwater system. Compliance with the Council’s resource consents for discharge from its stormwater system measured by the number of: ÿ Abatement Notices ÿ Infringement Notices ÿ Enforcement Orders ÿ Convictions received by Council in relation to those resource consents. (LTP Target 2018/19 – 100% compliance)
Response Times The median response time to attend a flooding event, measured from the time that Council received notification to the time that service personnel reach the site. (LTP Target 2018/19: Median response time to emergency events – 1 hour Median response time to urgent events – 4 hours)
Stormwater - Emergency Response Attendance Time - 88.89% 100% 1 hour target – (90%) Achieved Achieved (median = 17 (median = 13 minutes) minutes) Stormwater - Urgent Response Attendance Time - 4 hour 81.82% 96.43% target – (90%) Achieved Achieved (median = 1 (median = 22 hour and 12 minutes) minutes) Customer Satisfaction Stormwater - Customer Satisfaction. Number of 0.40 0.14 complaints received by Council about the performance of its stormwater system. The number of complaints received by Council about the performance of its stormwater system, expressed per 1000 properties connected to the Council’s stormwater system. (LTP Target 2018/19 <4 complaints per 1000 properties per annum)
30 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Programme of Works
Pipeworks
Status Progress to Street Start Finish Activity 2018/19 31 December Annual Plan 2018 Tay Street Nith Street Doon Street Renewal Carry forward Completed Melbourne Street St Andrew Street Newcastle Street Renewal Planned Planned
Mary Street Gala Street St. Andrew Street Renewal Planned In Progress
Bourke Street Windsor Street Queens Drive Renewal Planned Deferred
Pump Stations
Status 2018/19 Progress to 31 Location Activity Annual Plan December 2018 Beatrice Street SW Treatment Pond Carry forward Planned
31 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Stormwater Programme – Urban
32 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Stormwater Programme – Rural
33 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
WATER SUPPLY ACTIVITY
1 July 2017 1 July 2018 to 31 December to 31 December 2017 2018 Safety of Drinking Water The extent to which the local authority’s drinking water complies with: (a) Safety of Drinking Water – the extent to Achieved Achieved which ICC complies with drinking water standards - Part 4 of the drinking water standards (bacteria compliance criteria) (LTP Target - 100%) (b) Safety of Drinking Water – the extent to Achieved Achieved which ICC complies with drinking water standards - Part 5 of the drinking water standards (protozoal compliance criteria) (LTP Target - 100%) Customer Satisfaction The total number of complaints received by Council about any of the following: (a) Customer Satisfaction. Total number of Achieved Achieved complaints received by Council in relation to drinking water clarity (LTP Target – no more than 0.45 per month) (b) Customer Satisfaction. Total number of Achieved Achieved complaints received by Council in relation to drinking water taste (LTP Target – no more than 0.45 per month) (c) Customer Satisfaction. Total number of Achieved Achieved complaints received by Council in relation to drinking water odour (LTP Target – no more than 0.45 per month) (d) Customer Satisfaction. Total number of Achieved Achieved complaints received by Council in relation to drinking water pressure or flow (LTP Target – no more than 0.45 per month) (e) Customer Satisfaction. Total number of Achieved Achieved complaints received by Council in relation to continuity of supply (LTP Target – no more than 0.45 per month) (f) Customer Satisfaction. Total number of Achieved Achieved complaints received by Council in relation to council response to any of these issues. (LTP Target – no more than 0.45 per month)
34 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
1 July 2017 1 July 2018 to 31 December to 31 December 2017 2018 Expressed per 1000 connections to the Council’s networked reticulation system (LTP Target – Per 1000 connections) Demand Management The average consumption of drinking water per day per resident within the Invercargill City Council territorial district. (LTP Target – less than 700 litres/day) Fault Response Times (a) Fault response times. Attendance for Achieved Achieved URGENT call-outs. (median = 26 (median = 23 Attendance for urgent call-outs: from minutes) minutes) the time that Council received notification to the time that service personnel reach the site. (LTP Target – 4 hours) (b) Fault response times. Resolution of Achieved Achieved URGENT call-outs. (median = 2 hours (median = 1 hour Resolution of urgent call-outs: from the and 30 minutes) and 7 minutes) time that Council received notification to the time that service personnel confirm resolution of the fault or interruption. (LTP Target – 24 hours) (c) Fault response times. Attendance for Achieved Not Achieved* NON-URGENT call-outs. (median = 3 days, (median = 5 days, Attendance for non-urgent call-outs: 22 hours and 14 22 hours and 44 from the time that Council receives minutes) minutes) notification to the time that service personnel reach the site. (LTP Target – 5 working days) (d) Fault response times - Resolution of Achieved Achieved NON-URGENT call-outs (median = 7 days, (median = 7 days, 3 Resolution of non-urgent call-outs: from 23 hours and 57 hours and 1 minute) the time that Council received minutes) notification to the time that service personnel confirm resolution. (LTP Target – 10 working days) * Fault Response Attendance Times for Non-Urgent Work Orders: The Contractor did not achieve this target as their median response time was 22 hours and 44 minutes over the target of 5 days. ESG are continuing to work with the Contractor in an aim to improve response times.
35 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Programme of Works
Pipeworks
Status 2018/19 Progress to 31 Street Start Finish Activity Annual Plan December 2018 Elles Road Kingswell Creek Paisley Street Renewal Carry forward In Progress Lake Street Bluff Highway End Renewal Carry forward Completed Humber Street Frome Street End Renewal Carry forward Completed Mersey Steet Tweed Street Otepuni Bridge Renewal Planned Planned Eldon Street Inglewood Road David Street Renewal Planned Completed Tanner Street Heywood Street Baxter Street Renewal Planned Completed Scott Street Elles Road McQuarrie Street Renewal Planned Completed Clyde Street Tay Street Wood Street Renewal Planned Planned Dee Street Tay Street Victoria Ave Renewal Planned Planned Tay Street Dee Street Queens Drive Renewal Planned Planned
Pump Stations
Status 2018/19 Progress to Location Activity Annual Plan 31 December 2018 Waikiwi Reservoir Pump Replacement – No 3 Planned Planned
Water Treatment Plant
Status 2018/19 Progress to Location Activity Annual Plan 31 December 2018 Branxholme Treatment Plant Pump replacement – B pump Carry forward Planned
36 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Water Programme – Urban
37 Infrastructure and Services Agenda - MONITORING OF SERVICE PERFORMANCE
Map of Water Programme – Rural
**********
38 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: MELISSA BROOK – MANAGER, STRATEGY & POLICY
MEETING DATE: MONDAY 25 FEBRUARY 2019
AMENDMENTS TO BYLAWS DUE TO FIRE AND EMERGENCY NEW ZEALAND LEGISLATIVE CHANGES
SUMMARY
The report illustrates that the Fire Prevention Bylaw and sections of the Environmental Health Bylaw are no longer needed due to the changes in legislation introduced by the Fire and Emergency New Zealand Act 2017.
RECOMMENDATIONS
That the report Amendments to Bylaws due to Fire and Emergency New Zealand Legislative Changes be received
AND
That it be recommended to Council that Invercargill City Council Bylaw 2010/2 – Fire Prevention (Vegetation) be revoked as at 6 March 2019
AND
That it be recommended to Council that Invercargill City Council Bylaw 2017/2 – Environmental Health be amended to remove the words “become a fire danger and/or” from both clauses 5.2(c) and 5.3(d) as at 6 March 2019
AND
That public notice of the resolution of Council is given.
IMPLICATIONS
1. Has this been provided for in the Long Term Plan/Annual Plan? No 2. Is a budget amendment required? No 3. Is this matter significant in terms of Council’s Policy on Significance? No 4. Implications in terms of other Council Strategic Documents or Council Policy? This report recommends revoking a current Bylaw and making minor amendments to another.
39 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
5. Have the views of affected or interested persons been obtained and is any further public consultation required? Consultation is not required, but Council must publicly notify the resolution to revoke. 6. Has the Child, Youth and Family Friendly Policy been considered? Not applicable.
FINANCIAL IMPLICATIONS
No financial implications arise from this report.
BACKGROUND
The Fire Prevention (Bylaw) was first adopted in 2010 and last year was subjected to a review, the outcome of which was that Council determined to continue with the Bylaw until the Fire and Emergency New Zealand legislation had been enacted.
The existing bylaw covers matters including:
∑ Fire Districts ∑ Prevention of vegetation fires ∑ Fires in open air in Urban Fire Districts ∑ Permits for lighting fires ∑ Prohibition of fires
Many of these provisions are inconsistent with the new legislation and must be amended or revoked.
The Environmental Health Bylaw gives authority to Council to order a person to remove items on their land that may become a fire danger. This authority now lies with Fire and Emergency New Zealand. The remainder of the clause considers the harbourage of vermin and should be retained. Although the Environmental Health Bylaw is within the delegated authority of the Regulatory Services Committee, as it is a minor part of the overall changes required for the Fire and Emergency New Zealand legislative amendments, it was agreed with the Chair of Regulatory Services that the Infrastructure and Services Committee would consider the entire matter.
LEGISLATIVE CONSIDERATIONS
The Fire and Emergency New Zealand Act 2017 (FENZ Act) is intended to modernise New Zealand’s fire service through setting up a single fire organisation responsible for urban and rural fire. The FENZ legislation requires councils to amend or revoke bylaws that are inconsistent with it, following consultation with Fire and Emergency New Zealand.
Under section 155 of the Local Government Act 2002, when making or amending a bylaw, the Council must consider whether the bylaw is the most appropriate way of addressing the perceived problem. The current Fire Prevention (Vegetation) Bylaw would not meet these requirements as existing legislation now addresses these matters. This is also true of the fire prevention clauses within the Environmental Health Bylaw.
40 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
CONSULTATION
The FENZ Act inserted a new section 152B to the Local Government Act 2002. This section states that, if appropriate given the new legislation, and following consultation with FENZ, Council may amend or revoke fire provisions within its bylaws. In these circumstances, Council is not required to consult the public; rather it can amend or revoke these provisions by resolution publicly notified.
The Manager, Strategy and Policy has discussed this matter with FENZ and they are comfortable with the revocation of Invercargill City Council Bylaw 2010/2 – Fire Prevention (Vegetation) and amending Invercargill City Council Bylaw 2017/2 – Environmental Health to remove the words “become a fire danger and/or” from both clauses 5.2(c) and 5.3(d). During discussions it was agreed that Council staff and the local FENZ team would work together to ensure that appropriate guidance was given to members of our community regardless of whether they had approached FENZ or the Council to get that information.
The Manager, Strategy and Policy has discussed the revocation of the Fire Prevention Bylaw and the amendment of the Environmental Health Bylaw with FENZ in order to satisfy the consultation requirement. If the recommendation is accepted by Council, FENZ will be sent a letter advising of Council’s decision to revoke the Bylaw.
OPTIONS CONSIDERED
Option One – Revoke the Fire Prevention Bylaw and Amend the Environmental Health Bylaw (Recommended option)
It is recommended that Council revoke the Fire Prevention Bylaw and amend the Environmental Health Bylaw at the earliest possible date to align with the FENZ Act.
Advantages Disadvantages ∑ Meets the obligations under the FENZ ∑ There may be a matter that is missed by Act in respect of inconsistent Bylaws. existing legislation that has not been ∑ Avoids any confusion over the body now considered. (Officers consider this responsible for managing fire-related unlikely as the Fire Prevention Bylaw has issues. not needed to be enforced since adoption ∑ No further time / cost spent on reviewing and the Environmental Health Bylaw and amending the Bylaw. retains its ability to deal with nuisance). ∑ Offers consistency nationally as several other councils have revoked their bylaws.
41 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
Option Two – Amend both Bylaws
This option would involve further investigative work to amend and consult on the Fire Prevention (Vegetation) Bylaw. Most areas of the bylaw would still require revocation as they are superseded by legislation.
Advantages Disadvantages ∑ Would offer the opportunity to ask the ∑ Would require legal review to ensure that public for feedback, although it is the bylaw does not create inconsistencies currently unclear what the bylaw would with the FENZ Act. contain. ∑ At best arguable that the bylaw would pass the section 155 Local Government Act 2002 test of identifying a problem to be addressed and being the most appropriate means of addressing the perceived problem.
It is considered that Council already has sufficient legislative options for addressing any issue that may arise and that the risk of developing a potentially conflicting bylaw outweighs any advantage of amending the bylaw. For this reason, option two is not preferred.
NEXT STEPS
Should the Committee and then Council adopt the recommendation to revoke the Bylaw, public notice of the revocation will be given in the Southland Times and on the Council’s website. A letter outlining Council’s determination will also be provided to Fire and Emergency New Zealand.
**********
42 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: RUSSELL PEARSON – ROADING MANAGER
MEETING DATE: MONDAY 25 FEBRUARY 2019
TEMPORARY AMENDMENT TO BYLAW FOR TRAFFIC CHANGES DURING ILT HOTEL SITE DEMOLITION WORKS
SUMMARY
The demolition work required for the new ILT hotel has commenced and this will have impacts on the traffic movements in the inner city. This report highlights two changes to traffic flow which are recommended to be undertaken to ensure reasonable and safe access is provided in Don and Esk Streets. These changes require Council to vary the Bylaw 2015/3 (Appendix 1 of the Bylaw) for the period of the demolition, being two weeks (approximately 23 March to 7 April 2019).
RECOMMENDATIONS
That the report Temporary Amendment to Bylaw for Traffic Changes During ILT Hotel Site Demolition Works be received
AND
It is recommended to Council that Bylaw 2015/3 Roading and Traffic - Schedule 1 - One Way Roads be amended to allow, for the period of demolition, Stage Two of the ILT Demolition Management Plan:
∑ Don Street from Kelvin Street to Dee Street – Travel be in both directions. ∑ Esk Street from Kelvin Street to Dee Street – The direction of travel be from east to west.
AND
Council resolves that at the conclusion of Stage Two of the work, Schedule 1 will return to:
∑ Don Street from Kelvin Street to Dee Street – The direction of travel is from east to west. ∑ Esk Street from Kelvin Street to Dee Street – The direction of travel is from west to east.
IMPLICATIONS
1. Has this been provided for in the Long Term Plan/Annual Plan? No 2. Is a budget amendment required? No
43 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
3. Is this matter significant in terms of Council’s Policy on Significance? No 4. Implications in terms of other Council Strategic Documents or Council Policy? No 5. Have the views of affected or interested persons been obtained and is any further public consultation required? No. Feedback will be sought from the business retailers and Police. 6. Has the Child, Youth and Family Friendly Policy been considered? The Policy has been considered in developing this approach.
FINANCIAL IMPLICATIONS
None.
BACKGROUND
Work on the demolition of inner city buildings for the new ILT hotel has begun. This work has been planned in two stages, with respect to the required traffic management, to keep the site (vehicles and pedestrians) safe.
The Council Bylaw 2015/3 Roading and Traffic sets and approves the direction of any one way traffic and this report looks to seek Council approval to vary the Bylaw for a short period. Whilst normally public consultation would be sought for a long term change, this request is for a short period and as such, consultation is not seen as necessary in this case.
Stage One of the demolition works requires a lane to be closed in Dee Street and removal of a left turn from Don Street. This stage has little impact on access to the inner city area for vehicles or pedestrians travelling past the site.
Stage Two however is when the tallest buildings are to be demolished and a much larger exclusion zone is required. The Contractor has been working with NZTA and Council on options for this stage and the impacts of the planned demolition methodology are now apparent. This work is likely to start in late March and runs for approximately two weeks.
Traffic management for Stage Two requires all the south bound lanes on Dee Street to be closed as the fall zones for the buildings extends out to the centre islands. The impact of this is that Don Street would not be able to exit to Dee Street, nor would any vehicle be able to enter Esk Street whilst Dee Street (eastside from Spey to Don Streets) will only have limited access.
This is seen as having a significant impact on the CBD retailers and consequently this report seeks to vary the Council Bylaw (2015/3 Roading and Traffic) and allow changes to the traffic flow directions.
What is being proposed to assist the CBD (for the Stage Two period of demolition) is to:
1. Don Street (Dee to Kelvin Streets)
Allow traffic to flow in both directions, entering and exiting at Kelvin Street, which will require a variation of the one way flow in Appendix 1 of the Bylaw.
44 Infrastructure and Services Agenda - DEVELOPMENT OF POLICIES/BYLAWS
As traffic will not be able to exit onto Dee Street, vehicles will instead use a temporary roundabout situated toward the end of Don Street and exit onto Kelvin Street. Changes will be made to give good clear indication of the lanes and changes to the traffic signals to accommodate vehicles exiting.
This will allow businesses to access their existing car parking and for the public to gain relatively close access to businesses for the short closure period. Travel past the umbrella will be via a priority give-way similar to one lane bridges and will need some consideration of all drivers to make sure this is not a conflict point. On-street car parking will still be mostly available. It is seen to be a good option to keep the area operational for the other businesses.
2. Esk Street (Kelvin to Dee Streets)
Reverse the direction of traffic from Kelvin to Dee Streets. Parking layouts may need to be temporarily changed. Vehicles would still exit to Dee Street safely. There is only one off-street underground carpark and this would still provide access to these parks.
This is a relatively significant change but without this proposal no traffic would enter Esk Street during Stage Two demolition works. This is seen to be a necessary change. A test drive through has been undertaken and highlighted some potential risk areas which will need to be managed.
Again the Bylaw sets the travel direction and this report is seeking Council approval to vary this during the Stage Two demolition period (of approximately two weeks).
The risks of these changes have been well considered by Council staff and both streets are in a slow traffic environment with the greatest risk being to pedestrians, as traffic will be approaching from a different direction to what they would expect. These risks will be minimised by additional signage, removing some parks and media coverage advising of the changes.
Both requested changes will be closely monitored for safe operation and in the event it is found they are not working well, the streets would be closed to all traffic for the remaining time of the demolition stage.
These changes are important to try to keep the traffic flowing within the inner city.
CONCLUSION
The demolition work required for the new ILT hotel has commenced and this will have an impact on the traffic movements in the inner city.
This report highlights two changes which are recommended to be undertaken to ensure reasonable and safe access can be provided in Don and Esk Streets.
These changes require Council to vary the Bylaw 2015/3 for the period of the demolition, being two weeks (approximately 23 March to 7 April 2019).
**********
45 Infrastructure and Services Agenda - ACTION SHEET
ACTION SHEET
Item Action Required Date for Completion Person Responsible Unsealed Road Issues Raise the matter of Development 25 February 2019 Cr Thomas Contributions with the Chair of Finance and Policy Committee.
46 Infrastructure and Services Agenda - TEMPORARY ROAD CLOSURES
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: RUSSELL PEARSON - ROADING MANAGER
MEETING DATE: MONDAY 25 FEBRUARY 2019
TEMPORARY ROAD CLOSURES
SUMMARY
Council has received requests for a temporary road closure for the following events:
South Alive Trolley Race - 3 March 2019 Children’s Day Event - Fire Service - 3 March 2019 Surf to City Event - 10 March 2019 ANZAC Parade - 25 April 2019 The Infrastructure and Services Committee is asked to approve these road closures utilising its powers under Local Government Act 1974 (Section 342 and Schedule 10). This Act allows Council to close a road for an event after consultation with the NZ Police and Ministry of Transport, and which it decides will not unreasonably impede traffic.
RECOMMENDATIONS
That the report Temporary Road Closures be received
AND
That the Infrastructure and Services Committee agrees that the proposed events will not impede traffic unreasonably
AND
The Committee resolves under the Local Government Act 1974 (Section 342 and Schedule 10) that it approves the temporary road closure for these events for the times, dates and locations as specified in the report.
IMPLICATIONS
1. Has this been provided for in the Long Term Plan/Annual Plan? No 2. Is a budget amendment required? No 3. Is this matter significant in terms of Council’s Policy on Significance? No 4. Implications in terms of other Council Strategic Documents or Council Policy? No
47 Infrastructure and Services Agenda - TEMPORARY ROAD CLOSURES
5. Have the views of affected or interested persons been obtained and is any further public consultation required? No. The Local Government Act 1974 Section 342 does not require consultation. 6. Has the Child, Youth and Family Friendly Policy been considered? Yes. These events support this policy.
FINANCIAL IMPLICATIONS
None.
BACKGROUND
The Local Government Act 1974 Section 342 allows Council or its Committees to close a road for an event after consultation with the NZ Police and Ministry of Transport, and which it decides will not unreasonably impede traffic. Consultation with the public under this legislation is not required.
Council has received a request for a temporary road closure of the following streets for the events listed:
STREET DATE TIMES EVENT NAME Rimu Street Sunday 3 March 2019 12.00 pm to 5.00 pm South Alive Trolley Metzger to east end Race Metzger Street No 126 to Rimu Street Jed Street Sunday 3 March 2019 10.00 am to 3.00 pm Emergency Services – Don Street to Spey Street Children’s Day Event Dunns Road Sunday 10 March 9.00 am to 12.30 pm Surf to City Event Oreti Beach to Ariki 2019 Avenue Dunns Road and Stead 9.00 am to 12.30pm Street Ariki Avenue to Bond Street Curran Road 9.00 am to 10.30 am 200m from Dunns Road Bond Street 9.00 am to 12.30 pm Tweed Street to Victoria Avenue (northbound lane closure only) Victoria Avenue 9.00 am to 1.00 pm Bond Street to Dee Street (eastbound lane closure only) Victoria Avenue 9.00 am to 1.00 pm Dee Street to Museum Kelvin Street 9.00 am to 1.00 pm Gala Street to Victoria Avenue (northbound lane closure only) Gala Street Wednesday 25 April 6.00 am to 9.00 am ANZAC Parade Dee Street to Kelvin 2019 Street Victoria Avenue Dee Street to Kelvin Street
48 Infrastructure and Services Agenda - TEMPORARY ROAD CLOSURES
The timing of the Council meetings and the request being received requires in this instance that the Committee approves the events such that suitable public notification can be made.
The NZ Police have been consulted on these proposed closures and have no objection.
The proposed traffic management plans are the same as has been utilised successfully in the past.
These events are well organised and will not unreasonably impact on traffic.
CONCLUSION
The events are beneficial to the Invercargill community and, with appropriate traffic management, will not unreasonably impede traffic in these areas.
**********
49 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: ALISTER MURRAY – WATER MANAGER
MEETING DATE: MONDAY 25 FEBRUARY 2019
UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
SUMMARY
Council has committed through the Long Term Plan (LTP) process to develop an emergency water supply to avoid the high risk of dependency on its one current source. A deep underground water source is seen as the best solution. A report from Land and Water Science (LWS) has been received which states that a strata known as the Chatton Formation is the most promising source to act as an emergency water supply. Amongst other points the report signals that because of Southland geology it is almost certain that underground water will require treatment to achieve potable standard. The LWS report identifies a methodology with indicative costings and recommends a staged approach with successive phases. Because of the nature of underground exploration, costs to complete an exploration project would be in the range of $400,000-$750,000. There are sufficient funds in this year’s budget to commit to Phase 1 and Phase 2 if the redirection of $100,000 within the Water Capital budget is approved. However, additional funds of up to $537,400 will be needed to complete this project in the next financial year.
RECOMMENDATIONS
That the report Underground Water Supply Exploration for Emergency Alternative Source be received
AND
That Council approves the redirection of $100,000 allocated for supply of water to the Awarua Industrial development to the project of exploration of underground water sources
AND
That Council commits to Phase 1 and Phase 2 of the project to explore underground water as a source for an emergency / alternative water supply
AND
That Council agrees to Phases 3 and 4 being considered in the 2020/21 Annual Plan process, subject to a peer review of the results of Phase 1 and Phase 2.
50 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
IMPLICATIONS
1. Has this been provided for in the Long Term Plan/Annual Plan? Yes 2. Is a budget amendment required? Yes 3. Is this matter significant in terms of Council’s Policy on Significance? No 4. Implications in terms of other Council Strategic Documents or Council Policy? None 5. Have the views of affected or interested persons been obtained and is any further public consultation required? N/A 6. Has the Child, Youth and Family Friendly Policy been considered? N/A
FINANCIAL IMPLICATIONS Additional funds to that allocated within the current year’s budget and the LTP for the next year will be required.
BACKGROUND
The LTP has recognised the importance of the creation of resilience in its water supply. It has made provision to develop an alternative source over the 2025-2027 period thus decreasing the risk of the catastrophic outcome should its current single source, the Oreti River / Branxholme Treatment system, fail or be subject to major disruption. The LTP has an allocation of $11 million for development of an emergency / alternative water source.
An underground source rather than another surface water source is the most desirable from the perspective of both increasing resilience and lowest cost.
This report looks in detail at the likely cost of exploring underground sources and follows the August 2018 report to Council and the November Mahi newsletter. Its purpose is to determine a way forward for the project of exploration of underground water to act as an emergency supply for the Invercargill Community.
Progress since August 2018
A report commissioned by Venture Southland titled ‘Municipal Groundwater Supply Investigation: Desktop Assessment of Existing Information’ has been received (refer to Appendix 1). The report has been prepared by Land and Water Science (LWS). The report gives good context of underground waters in the southern region plus a methodology and likely cost of further exploration.
The main points from that report are:
1. A deep underground aquifer source is less likely to be influenced by land use and is less likely to impact existing shallow bores or surface waters.
51 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
2. Although there are many shallow wells there are few deep (>100 metres) wells across the region. 3. Any deep groundwater source will very likely require treatment to potable standard. 4. Southland geology and underground aquifers are markedly different from those in Canterbury, making them much lower yielding and naturally poorly potable. 5. However, a strata known as the Chatton Formation that occurs throughout the Southland region and is thought to exist beneath Invercargill City is considered the most promising source to act as an emergency supply. 6. Exploration of underground water supplies could cover a wide range of cost and is best approached in phases with each step used to verify the next step.
Methodology / Indicative Costings
A methodology together with likely cost and duration is described in the table below. (Appendix 5 of the LWS report provides a detailed breakdown). Phase descriptions have been slightly altered to that in the LWS report for brevity. In addition to the budget described by LWS, an allowance of $20,000 has been added to identify the likely cost of treatment and abstraction. This has been included in Phase 1 below.
Phase Description Minimum Maximum Duration Cost Cost (months) 1 Evaluation of Chatton Formation water $29,700 $32,400 4 parameters (treatability) 2 Develop model of Chatton Formation $100,000 $137,000 6 3 Exploratory drilling $80,000 $125,000 1 4 Pilot well and aquifer testing $230,000 $440,000 1 TOTAL $439,700 $734,400 12
It may be possible to not undertake the exploratory drilling phase and progress directly to Phase 4, in which case costings range from a minimum of $359,700 and up to $734,400.
It is important to note that:
∑ The above costings are indicative and do not include the development of a bore supply. ∑ Each phase would be checked and redefined from the knowledge of the preceding phase before commitment. ∑ There is a degree of uncertainty in the success in locating a suitable underground source as there is in prospecting for anything underground. ∑ Well researched investigative works before making full commitment to the development of any water source is a wise investment to ensure a good outcome plus the avoidance of unwelcome surprises later on. ∑ There is considerable worth in committing to exploration of underground water as it is a considerably cheaper option than developing a source from the likes of Lake Hauroko or Wakatipu whose costs in a study done in the year 2000 were determined to be in the order of $50 million. ∑ This year’s budget includes an amount of $77,000 for the exploration of an emergency / alternative water source. This is sufficient to cover Phase 1 and part of Phase 2. The LTP makes no further provision, thus there is a shortfall to complete Phases 3 and 4. ∑ Completion of the project would not occur until well into the following financial year. ∑ A peer review of the findings of Phase 1 and Phase 2 will be conducted before committing to the next phases.
Funding Implications
Within this year’s capital works budget is an amount of $100,000 carried forward from the previous year as a contribution towards the provision of water supply to Council’s Awarua
52 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Industrial site. It is unlikely that this will be utilised. If this $100,000 was redirected to the emergency / alternative water exploration project a total of $177,000 would be available which would cover the cost of Phase 1 and Phase 2.
Phases 3 and 4 of the project would require a further maximum cost of $557,400 (after deducting the available funds of $177,000) for project completion.
The following options for funding the project is recommended to be included in the 2020/21 annual plan process. Council can control the timing of Phases 3 and 4 and therefore when the expenditure is incurred, as this could be brought forward if funding is made available. 1. Make provision now in the Annual Plan for 2020/21. 2. Wait until the end of the current financial year and redirect any surplus towards the completion of the project. There may of course still be a need to access additional funds if the end of year surplus is insufficient.
CONCLUSION
The cost for exploration of underground water supplies covers a wide range which in round terms is from $400,000 to $750,000 and could take a year to complete, so will extend into the next financial year. It is possible to fund Phase 1 in the current year’s budget and Phase 2 with the redirection of $100,000, but additional funds will be needed to complete the project.
**********
53 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
APPENDIX 1
Municipal Groundwater Supply Investigation: Desktop Assessment of Existing Information
Dr Clint Rissmann, Dr Lisa Pearson, Dr Monique Beyer and Matt Couldrey
Land and Water Science Report 2018/32 November 2018
www.landwaterscience.co.nz
54 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Municipal Groundwater Supply Investigation: Desktop Assessment of Existing Information
Prepared by Rissmann, C., Pearson, L., Beyer, M., and Couldrey, M.
Land and Water Science Ltd. www.landwaterscience.co.nz 61c Leet Street Invercargill, 9810 New Zealand
Corresponding Author Clint Rissmann Contact number: 03 214 3003 Email: [email protected]
Document Information Land and Water Science Report No: 2018/32 Prepared for: Venture Southland Report Date: 30.10.18 Project Number: 18014
Reviewed By: Mr Jens Rekker Organisation: Lincoln Agritech Position: Hydrogeologist Review Date: 14.11.18
Document Status: Final
Citation Advice Rissmann, C., Pearson, L., Beyer, M., and Couldrey, M. (2018). Municipal Groundwater Supply Investigation: Desktop Assessment of Existing Information. Land and Water Science Report 2018/32. P38.
Disclaimer: This report has been prepared by Land and Water Science Ltd. (Land and Water Science) exclusively for, and under contract to Venture Southland. Land and Water Science accepts no responsibility for any use of, or reliance on any contents of this report by any person or organisation other than Venture Southland, on any ground, for any loss, damage, or expense arising from such use or reliance. Information presented in this report is available to Venture Southland for use from October 2018.
Land and Water Science Report 2018/32 i Project Number: 18014
55 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Table of Contents
Table of Contents ...... ii List of Figures ...... iii List of Tables ...... iii Executive Summary ...... 1 Community Summary ...... 4 1 Introduction ...... 10 1.1 Geological Setting ...... 10 1.2 Area of Interest ...... 11 2 Summary of Existing Information ...... 13 2.1 Most Relevant Data Sets ...... 13 2.1.1 Geology and lignite resource investigations datasets ...... 13 2.1.2 Aeromagnetic data ...... 15 2.1.3 Recent geological works of relevance ...... 17 2.1.4 Hydrogeological studies ...... 17 2.2 Indirectly Relevant Data Sets ...... 18 2.2.1 GNS Science...... 18 2.2.2 Radiometric Survey (Gamma-ray emission) ...... 23 2.2.3 Environment Southland Well Database ...... 25 2.2.4 Environment Southland Aquifer Management Zones ...... 29 2.3 Other requested datasets ...... 30 3 Deep Aquifer Working Group ...... 30 4 Conclusions and Recommendations ...... 30 5 References ...... 34
Land and Water Science Report 2018/32 ii Project Number: 18014
56 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
List of Figures
Figure 1: Location of the Southeastern Plains and survey blocks from Isaac and Lindqvist (1990). .... 11 Figure 2: a) Gore water supply from two groundwater bores (Cooper’s well and Jacobstown well). b) The current Invercargill water supply is a surface water extraction from the Oreti River at Branxholme. Yellow shaded area of interest (AOI) provided by Venture Southland. The orange outline defines a 15 km radius and excludes areas of rock outcrop around Gore for which all existing borelog data was requested from Environment Southland...... 12 Figure 3: Example of composite stratigraphic columns from Isaac and Lindqvist (1990) across the key search areas of the Southeastern Plains. See also Figure 1 for a spatial reference. The subdivision of the East Southland Group sediments occurs along the bottom extent of the figure...... 14 Figure 4: Aeromagnetic survey data for the Southland plains showing area of interest around Invercargill and Gore communities (NZP&M)...... 15 Figure 5: Image of the survey block north of Gore Township. This data was not available in the same format as Figure 4 from NZP&M...... 16 Figure 6: View of the Southland 3D geological model from the south (source: Tschritter et al., 2015)...... 19 Figure 7: Location of cross sections from Southland geological model across the areas of interest. .. 20 Figure 8: Cross sections of Southland geological model in the Invercargill area of interest (AOI 1). These x-sectional models lack the vertical and spatial resolution necessary for evaluating deep aquifer resource potential but do provide some gross constraint over the thickness of major geological units...... 21 Figure 9 continued: Cross sections of Southland geological model in the Gore area of interest (AOI 2)...... 23 Figure 10: Radiometric survey coverage over the areas of interest for deeper groundwater resources...... 24 Figure 11: Annual groundwater abstraction quantities (m3/year) in Southland...... 26 Figure 12: Bore locations by depth in the Invercargill area of interest. The majority of deeper bores (>100 m) are associated with historical lignite exploration and are not groundwater takes...... 27 Figure 13: Bore locations by depth in the Gore area of interest. The majority of deeper bores (>100 m) are associated with historical lignite exploration and are not groundwater takes...... 28 Figure 14: Southland’s groundwater resources are delineated into groundwater management zones (GWMZs). The GWMZs (before 2016) were classified by Aquifer Type into lowland, riparian and terrace aquifers; the boundaries for these zones were redefined in 2016 (Hughes, 2017)...... 29
List of Tables
Table 1: Summary of alternative water sources, costs, advantages and disadvantages (MWH, 2000) . 2 Table 2: Total depth (m bgl) and use of available bore log data for the Invercargill extended areas of interest (Environment Southland data, 2018)...... 27 Table 3: Total depth (m bgl) and use of available bore log data for the Gore extended areas of interest (Environment Southland data, 2018)...... 28 Table 4. Indicative Cost Estimate for Phase 1 - 4 ...... 33
Land and Water Science Report 2018/32 iii Project Number: 18014
57 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Executive Summary
Invercargill City currently lacks an emergency or supplementary water supply being reliant solely on takes from the Oreti River. In 2000 Invercargill City Council (ICC) commissioned a Scoping Investigation of Water Supply Alternatives in response to the possibility of restrictions during periods of low flow on the Oreti River (MWH, 2000). This report investigated 10 alternative water supply sources and assessed each in terms of their costs and the associated advantages and disadvantages (Table 1). Cost benefit analysis over a 30-year life cycle revealed that groundwater alternatives were the least expensive but identified large uncertainty associated with the existence or otherwise of suitable aquifers. Since this report, surface water quality has declined significantly and climatic variation has resulted in record low flows with the likelihood of a greater number of drought conditions for the region identified by climate scientists. As such, the importance of a secure emergency or supplementary water source for Invercargill City has been raised as a key strategic priority. This following report provides a desktop summary of the existing information associated with the groundwater resources of the southern Southland Plains. The main findings of this report are as follows: • The high volumes of water required by Invercargill City and the risks of contamination by land use activities mean that ‘shallow’ or unconfined aquifers are not a viable alternative water source.
• There is ample deep groundwater beneath the southern Southland Plains but little knowledge of the existence of aquifers that are sufficiently high yielding for municipal supply.
• From the review of lignite exploration data and from a deep aquifer exploration, drilling and aquifer testing study for the Ocean Beach meat works, c. 1980’s, the Chatton Formation shell-bed aquifer is raised as a possible high yielding groundwater source. The Chatton Formation lies beneath the Gore Lignite Measures and overlies the deep basement, extends across ~20,000 km2 of Southland and Otago, and is thought to extend beneath Invercargill City at depths of between 160 – 200 m.
- As part of an alternative water source investigation by the Alliance meat works at Ocean Beach in the mid-1980’s a deep drilling intersected a permeable, and relatively high yielding, shell-bed aquifer at 160 m below ground within the Oligocene Chatton Formation. However, due to issues of water hardness the source was not developed. Issues of water hardness are common to all deep groundwaters beneath the southern Southland Plains.
• Historical lignite exploration data and more recent geophysical surveys (aeromagnetics) provide an enviable data set for developing a better understanding of the subsurface environment including the relative depth and thickness of the Chatton Formation beneath Invercargill city. To date this data has not been used to develop an understanding of the deep groundwater resources beneath Invercargill City.
Land and Water Science Report 2018/32 1 Project Number: 18014
58 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Table 1: Summary of alternative water sources, costs, advantages and disadvantages (MWH, 2000)
Source Type Indicative Cost* Advantages Disadvantages Supplementary Replacement Regulating 14,000 m3/day 40,000 m3/day ($M) ($M) ($M) Invercargill High Quality 3-4 11-17 - • Possible low cost, • Yet to be proven Groundwater Groundwater high quality, secure (Sec. 6.2) source Invercargill Groundwater 4-7 24-36 - • Possibly secure • Yet to be proven Groundwater Needing source • Likely high (Sec. 6.2) Treatment treatment costs Windley River River - - 8-12 • Relatively Low Cost • Dam with land and (Sec. 6.3) Regulating • No conveyance consents issues infrastructure • New lake with possible environmental/ agricultural/ recreational benefits created Oreti River River - - 14-20 • Relatively Low Cost • Dam with land and (Sec. 6.4) Regulating • No conveyance consents issues infrastructure • New lake with possible environmental/agricu ltural/ recreational benefits Dunsdale River 19-28 29-43 - • New lake with • High cost Stream (direct supply) possible • Dam with land and (Sec. 6.5) environmental/ consents issues recreational benefits • Long pipeline Otapiri Stream River 19-28 27-41 - • New lake with • High cost (Sec. 6.6) (direct supply) possible • Dam with land and environmental/agricu consents issues ltural/ recreational • Long pipeline benefits created Pourakino River 22-33 32-48 - • New lake with • High cost River (direct supply) possible • Dam with land and (Sec. 6.7) environmental/ consents issues recreational benefits • Long pipeline created Lake Hauroko Lake 52-77 80-120 - • Abundant, high • Very high cost (Sec. 6.8) quality source • Very long tunnel/pipeline Lake Lake 20-29 39-57 - • Abundant source • Very high cost Monowai/ • Waiau Rv. Waiau River Environmental (Sec. 6.9) Concerns • Relies on cooperation of hydro • Long pipeline Lake Wakatipu Lake 36-55 70-106 - • Abundant, high • Very high cost (Sec. 6.10) quality source • Very long pipeline Foveaux Strait Seawater 40-153 410-1,870 - • Unlimited source • Extremely high cost (Sec. 6.11) • Questionable potable water quality • New technology in NZ • High operator expertise required * Lifecycle cost based on 30 years at 7% discount rate
Land and Water Science Report 2018/32 2 Project Number: 18014
59 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Therefore, the recommendations of this report include a phased approach: Phase I. In light of the costs of surface water options, the viability of the Chatton Formation shell- bed aquifer beneath Invercargill City should be evaluated. The proposed steps constitute a stop/go for evaluation: • Evaluation of likely hardness and hydrochemical composition of waters abstracted from carbonate aquifers regionally and if possible, the Chatton Formation aquifer. • Evaluate and supply data to water treatment engineers to assess a per cubic meter treatment cost. - Estimated cost: $9,300 - $13,100 Phase II. Compilation and digitising of existing geological, down hole geophysical and more recent geophysical survey data (aeromagnetics) within a 15 km radius of Invercargill City to generate a conceptual model (hydrostratigraphic model) of the Chatton Formation beneath Invercargill City. Recommendation or otherwise of drilling targets by a team of recognised experts. - $100,000 - $137,000 Phase III - IV. Exploratory drilling and/or pilot well drilling and aquifer testing. • Scenario 1 (Phase III): exploratory drilling prior to pilot well drilling (based on estimates from exploration geologists and drilling operators): - Exploratory drilling: $80,000 - $100,000 per drill hole - Pilot well and aquifer testing: $230,000 - $440,000 per well • Scenario 2 (Phase IV): Pilot well drilling only and aquifer testing - Pilot well and aquifer testing: $230,000 - $440,000 per well Exploratory drilling provides much more detailed information as to the subsurface stratigraphy than provided by the methods used for well drilling. The need for exploratory drilling should be clearer following conceptual model development (Phase II).
Land and Water Science Report 2018/32 3 Project Number: 18014
60 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Community Summary
Introduction Venture Southland is seeking to utilise existing data to better understand the state of knowledge around the location, volume (e.g. quantity) and quality of groundwater resources in the Southland Region with a strategic focus on the deeper groundwater resources in the vicinity of Invercargill City. Whereas other New Zealand municipalities of comparable size have multiple raw water supply sources that provide a degree of resilience, Invercargill City has a single source, Oreti River at Branxholme, and therefore lacks an alternative or emergency water source. Limitations surrounding a secure, high yielding water source have been a long-standing issue for the township of Gore. Awareness of the importance of a secure and reliable water supply for Invercargill City has been heightened by the severity of recent drought conditions over the 2017/2018 summer with long-term climate forecasts predicting an increasing frequency and severity of drought as well as flood events over the decades to come (Hughes et al., 2011; MfE and Stats NZ, 2017). Accordingly, this report seeks to collate and review existing data sources pertaining to the potential of a secure, deep groundwater source for municipal supply below the Southeastern Plains of Southland. In addition to a review of existing data, this work is supported by (i) consultation with geologists and hydrogeologists from applied research organisations with local expert knowledge of Southland, and; (ii) input from local drilling company staff with decades of drilling experience. Communication with both sets of parties through a workshop provided important context as to the relevance and value of existing data sets and for constraining recommendations as to next steps.
Groundwater setting of the Southeastern Plains Water hosted by fractures and spaces in underground rock and sediments is termed groundwater. However, as to whether the water can be extracted and used for human endeavours is dictated by the permeability of the sediments storing the water. For example, clay or mudstones may host substantial quantities of water but abstracting the stored water for human uses is limited by a lack of permeability, whereas materials with larger pore spaces (i.e. sand and gravel) have a much higher permeability. Saturated rock or sediments characterised by high permeability that also contains a large volume of easily extractable groundwater are termed aquifers. Another definition refers to aquifers as layers of saturated sediment or fractured rock that can sustain the abstraction of economic quantities of water. Across the Southeastern Plains of Southland shallow aquifers are hosted by a veneer of water laid ‘alluvial’ materials (i.e. clay, silt, sand and gravels) that overlie much older sediments and rock. Groundwater occupies the spaces or voids between these sediments, storing water that eventually discharges to streams, springs or seeps, or is abstracted for household, farm, industry, or community supply. The majority of Southland’s alluvial sediments that blanket the plains were deposited during geologically recent times (current day to c. 2.8 million years before present). However, unlike the Canterbury Plains, the shallow alluvial aquifer deposits of Southland are thin and discontinuous. Across the Southeastern Plains, thin alluvial deposits overlie older sediments and rock layers of the East Southland Group which includes the Gore Lignite Measures and deeper Chatton Formation marine deposits. As a result of the underlying topography of the East Southland Group, the thickness of alluvial sediments can vary from 0 to 30 m, although they average ~10 - 15 m in thickness. In contrast, across parts of the Canterbury Plains, the thickness of alluvial gravels commonly exceed 100 m and in places, 700 m before underlying bedrock is intercepted. Accordingly, the alluvial sediments of the Southeastern Plains have a relatively limited capacity to store groundwater.
Land and Water Science Report 2018/32 4 Project Number: 18014
61 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
The majority of Southland’s alluvial aquifers are replenished or ‘recharged’ during the cooler months of the year when plants are not actively transpiring. Excess water in the soil percolates to depth and replenishes the shallow aquifer system. Water tables in these aquifers are at their lowest levels during late summer and autumn, which is often a time that water demand peaks, and at their highest in late winter and spring. The combination of thin alluvial aquifers and seasonal variation in water level can severely limit water abstraction. Further, due to the high degree of connection between Southland’s shallow alluvial aquifers and the stream network, there are considerable limitations associated with the drawdown of these aquifers in terms of the depletion of flow in adjacent streams and springs. Across Southland the average water table depth is c. 2.6 m below ground level meaning that the soil zone is often in direct contact with the underlying water table. Accordingly, shallow alluvial aquifers are more susceptible to contamination by human activities due to their direct connection to the soil zone. Water quality issues, specifically microbial contamination can be addressed via chlorination or Ultra Violet (UV) light, but the removal of nitrate leached from the soil zone is both expensive and technically challenging. In short, limitations in terms of storage capacity, seasonal water table fluctuations, connection to surface water systems, greater climatic extremes and water quality risks have further highlighted the vulnerability and significant limitations of Southland’s thin alluvial aquifers. In response to the limitations of Southland’s shallow alluvial aquifers, deeper underground water supplies have been explored with an increasing number of takes from aquifers hosted by the upper units of the Gore Lignite Measures over the last 30 years. Within the Gore Lignite Measures, aquifers occur as more permeable layers sandwiched between lower permeability mudstones and lignite deposits. These aquifers have the benefit of being less impacted by seasonal variation in the water table and are less susceptible to the impacts of land use. As these aquifers are commonly sandwiched between less permeable layers they are referred to as being confined, whereas the overlying alluvial aquifers are referred to as unconfined given their direct connection to the land surface.
Deeper Groundwater Resources Up until the 1960s, Invercargill City abstracted groundwater from aquifers within the Gore Lignite Measures beneath Queens Park. Therefore, the abstraction of groundwater from confined aquifers within the East Southland Group sediments for municipal supply has a historical precedent. More recently c. 2016, Gore District have explored the potential for abstraction from the Waikaka Gravels that form a shallow, semi-confined, water-bearing layer at the top of the East Southland Group sediments according to Isaac and Lindqivst (1990). However, more recent thoughts are that these deposits are younger, Quaternary in age, and were deposited after the Gore Lignite Measures had be laid down (Rekker, 2016). Rekker (2016) evaluated the potential of the semi-confined Waikaka Gravels as a water resource in the vicinity and concluded that abstraction rates of 750 and 1,300 m3/d were possible. However, the unit is restricted in extent (far south as Willowbank) and showed elevated manganese and iron and may still be susceptible to shallow contamination by leakage from the unconfined aquifer source as observed by the authors for a significant number of bores in an equivalent setting. Groundwaters abstracted from the Gore Lignite Measures aquifers are commonly characterised by elevated iron and manganese which, in conjunction with relatively low yields have historically been viewed as a limiting factor to development. Given the geological setting of the Southeastern Plains, it is highly likely that considerable treatment of abstracted water would be required to address elevated calcium, magnesium, alkalinity and/or dissolved iron or manganese.
Land and Water Science Report 2018/32 5 Project Number: 18014
62 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Some degree of treatment is inevitable and the question of a secure supply becomes one of yield. Specifically, is there potential for deeper aquifers to sustain the high rates of abstraction required for municipal supply? Although pump test data from the upper Gore Lignite Measures aquifers suggest yields may be too small for municipal supply there have been few if any, studies dedicated to exploring whether or not additional high yielding aquifers exist at deeper levels within the East Southland Group sediments. The general absence of specific aquifer and pump test data for the deep aquifers of the Southeastern Plains was subsequently supported by consultation with local drilling companies and from a review of the aquifer test datasets held by Environment Southland. Despite a lack of studies into the potential of deep aquifers within the East Southland Group sediments, historical investigations of the lignite resources of the Southeastern Plains are a rich source of relevant information for addressing questions as to the groundwater potential. Specifically, c. 600 exploration boreholes that equate to c. 80,000 drilling meters were drilled through the East Southland Group sediments from the 1970s to early 1980s (Isaac and Lindqvist, 1990). All of these drill holes are accompanied by high-quality geological composite logs and approximately half include downhole geophysical measurements that provide critical information over the relative porosity and bulk density of subsurface materials which is important information for understanding aquifer potential. Further refinement of the subsurface environment in the vicinity of Gore and Invercargill was developed in response to the lignite characterisation work of the 2000s and included investigative drilling and downhole geophysics in the vicinity of the Mataura and Ashers-Waituna lignite fields (L&M Mining; Solid Energy). Most recently c. 2017, an airborne geophysical survey has revealed the previously unknown detail of the subsurface geology of the Southeastern Plains, providing the opportunity to better integrate high-quality lignite investigation work into a refined conceptual model of the subsurface hydrogeology of the East Southland Group sediments. In 1986, Morrison, Cooper and Partners (MCP) undertook what appears to be the only specific investigation into a deep aquifer source within the East Southland Group sediments for the then Ocean Beach meat works. This investigative study employed many of the same techniques and personnel utilised for lignite resource characterisation and stands out as one of the only examples of a dedicated hydrogeological investigation into deep groundwater resources of the Southeastern Plains. This high-quality work included surface geophysics, exploration drilling, downhole geophysics and aquifer yield testing. The results of this study identified the existence of a relatively high yielding (i.e., a transmissivity of 32 m2/day) shellbed aquifer within the greater Chatton Formation at between -130 to -160 m below ground level, several kilometres north of Bluff Harbour. Yields from the shellbed aquifer were significantly higher than in overlying Gore Lignite Measure aquifers (MCP, 1986). Despite being relatively high yielding the shellbed aquifer was not developed as a potable water source by the Ocean Beach Freezing Works facility due to elevated water hardness (i.e. elevated calcium, magnesium, alkalinity and/or iron and manganese). However, as noted above, it is unlikely that any deep-water source associated with the East Southland Group would be suitable for municipal supply without appropriate treatment. In general terms, the deep groundwater aquifers’ bore yields benefit from the deep setting positions of the submersible pumps. In contrast to shallow aquifers fitted with short vertical bores, the deep aquifer bores have a substantial allowance for water level decline (also known as self-induced head losses or ‘drawdown’) during pump operation. This results in shallow and deep aquifers with the same or similar transmissivity manifesting higher bore yield for the deep bore than the shallow one. An example elsewhere in the South Island is the shallow alluvium and deep confined aquifers above and below each other in central Tasman District. In a locality near Motueka, an 18 m bore with a transmissivity of 9,000 m2/d in the Motueka Alluvium has the same capacity 16 L/s as a 220 m bore in the Moutere Gravel Formation with a transmissivity of only 100 m2/d. The main factor that
Land and Water Science Report 2018/32 6 Project Number: 18014
63 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
provides this contrast is that the allowable drawdown in the shallow bore is only 2.5 m whereas the amount water levels can decline with the bore pump still operable in the deep bore is up to 65 m.
Is the Chatton Formation a Viable Deep Groundwater Source? Although the hydrogeological potential of the Chatton Formation hasn’t been studied in detail other than around Awarua and Green Hills, it is known to be regionally extensive with estimates of c. 20,000 km2 across modern-day Southland and Otago representing the existence of a shallow inland sea of Late Oligocene age (Duntroonian stage or c. 27.3 million years old; Lee et al., 2014). The Chatton Sea was subsequently infilled by a series of marine transgressions that deposited the Gore Lignite Measures (Isaac and Lindqivst, 1990; Lee et al., 2014; Gard, 2017). The Chatton Formation is known to outcrop in Bluff, Waikaia, Wendon Valley, Balfour, Mandeville, Chatton, Knapdale, Dolamore Park, Waimumu, Mataura, Hedgehope, Forest Hill, Winton Hill, Woody Knoll, and Bluff. The Chatton Formation is also known from drillholes at Waimumu, Mataura, Wyndham, Waituna, Asher’s Siding and north of Bluff. Despite being widespread, the majority of reports note that outcrops and drillhole information demonstrate rapid lateral changes in its composition (e.g. shell beds or low permeability silt) and thickness (Isaac and Lindqvist, 1990). Isaac and Lindqvist (1990) report a thickness of 145 m of Chatton Formation units from drillhole d1134 at Kapuka; at Retreat-Croydon Road Dolamore Park it is 100 – 200 m thick, and; ranges between 55 – 61 m thick at Wyndham and Waimumu. North of Bluff the thickness of the shelly coquina aquifer is reported as 39 to 55 m thick, whereas the greater Chatton Formation was considerably thicker. Elsewhere the Chatton Formation is represented by only a few meters of shelly sandstone or mudstone or is completely absent.
Summary and Recommendations Invercargill City has invested in the evaluation of the economic feasibility of a range of potential surface and shallow groundwater options (MWH, 2000). From this study, the abstraction and transport of water from Lakes Hauroko and Wakatipu was discounted for a variety of reasons, including the distance from the point of consumption, the seismic risk for water mains and the high cost of conveyancing and treatment. Of the options, a deep groundwater source was the economically most favourable option with the advantage of an added security relative to shallow or surficial water takes. The lower overall cost of a groundwater source relative to surface water is consistent with other studies nationally and internationally. Despite the lower cost and greater security of deep groundwater sources, the existence of a relatively high yielding and sustainable deep groundwater source beneath the Southeastern plains of Southland is largely unproven. Further, relative to the extensive and high yielding alluvial aquifer systems of the Canterbury Plains, the deeper aquifer systems of the Southeastern Plains are by their nature likely to present greater limitations in terms of yield and potability. These limitations reflect the unique geological setting of the region. The focus then becomes one of exploring the viability of a deep groundwater source associated with one or more higher yielding aquifer units within the East Southland Group sediments; the most promising of which may be the Chatton Formation which is known to exist beneath both Invercargill City and Gore Districts. The ability to further explore and refine the deep groundwater potential is supported by the rich data set and geological understanding of the East Southland Group sediments from the decades of lignite resource assessment. This high-quality data set, in conjunction with historical gravity and more recent airborne aeromagnetic survey data, provides an enviable dataset for ruling in or out the existence of a viable deep groundwater source(s) within the East Southland Group sediments. Notably, the Ocean Beach deep groundwater investigation utilised much of this historical knowledge
Land and Water Science Report 2018/32 7 Project Number: 18014
64 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
including similar methods to refine and identify a relatively high-yielding aquifer source north of Bluff Harbour. The historical geological, drill log and downhole geophysics data developed during the 1970s – 1980s has in places been locally augmented by more recent works. Specifically, 80 – 90 drill holes, drill logs and downhole geophysical logs were produced for the Mataura lignite field by Solid Energy in 2007. These drill holes are reported to intercept the Chatton Formation. Two phases of exploratory drilling and downhole geophysics were undertaken by L&M Mining Group in the Ashers-Waituna lignite field and also are known to intercept the Chatton Formation. Both of these more recent studies locally augment the understanding of the East Southland Group sediments. The historical investment in the understanding of the East Southland Group sediments has the potential to greatly improve the future understanding of the deeper groundwater resource of the Southeastern Plains without the need to invest in expensive measurement or drilling. However, the integration of relevant information into a coherent data set, including digitising of all historical bore logs, expert interpretation of existing geophysical data sets, and the production of a refined hydrogeological model of the groundwater system of the East Southland Group sediments and their viability for municipal or industrial supply, would require considerable investment. Possible tasks may include: • Integration and digitisation of all existing bore log and downhole geophysical data for the East Southland Group sediments into a detailed 3D model; • Refinement of the 3D architecture of the East Southland Group sediments with a focus on better defining the depth, continuity, thickness and likely permeability of aquifer units within the East Southland Group; • Correlation of 3D architecture and downhole geophysics with existing gravity and aeromagnetic data, to provide an integration surface and enhance the ability to extrapolate vertical and lateral continuity of subsurface strata including aquifer units, and; • Identification of suitable targets including their spatial location and depth.
The ultimate goal of the above work would be to utilise existing information to advance what is currently a limited understanding of the deeper groundwater potential of the East Southland Group sediments. The work would be of a desktop nature and would require a multidisciplinary team of geologists, hydrogeologists and geophysicists in order to maximise the value of the existing data set and should occur prior to consideration of costly exploratory drilling or geophysical survey. Ideally, the hydrogeologists and geologists involved in any such work would have a working knowledge of the East Southland Group sediments. The scope and investment in such a study would need to be carefully weighed given the potential that a great deal of effort could go into processing / analysing information without the provision of much additional value to municipal interests. Therefore, the recommendations of this report include a phased approach: Phase I. In light of the costs of surface water options, the viability of the Chatton Formation shell- bed aquifer beneath Invercargill City should be evaluated. The proposed steps constitute a stop/go for evaluation: • Evaluation of likely hardness and hydrochemical composition of waters abstracted from carbonate aquifers regionally and if possible, the Chatton Formation aquifer. Evaluate and supply data to water treatment engineers to assess a per cubic meter treatment cost. - Estimated cost: $9,300 - $13,100
Land and Water Science Report 2018/32 8 Project Number: 18014
65 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Phase II. Compilation and digitising of existing geological, down hole geophysical and more recent geophysical survey data (aeromagnetics) within a 15 km radius of Invercargill City to generate a conceptual model (hydrostratigraphic model) of the Chatton Formation beneath Invercargill City. Recommendation or otherwise of drilling targets by a team of recognised experts. - $100,000 - $137,000
Phase III - IV. Exploratory drilling and/or pilot well drilling and aquifer testing. • Scenario 1 (Phase III): exploratory drilling prior to pilot well drilling (based on estimates from exploration geologists and drilling operators): - Exploratory drilling: $80,000 - $100,000 per drill hole - Pilot well and aquifer testing: $230,000 - $440,000 per well • Scenario 2 (Phase IV): Pilot well drilling only and aquifer testing - Pilot well and aquifer testing: $230,000 - $440,000 per well Exploratory drilling provides much more detailed information as to the subsurface stratigraphy than provided by the methods used for well drilling. The need for exploratory drilling should be clearer following conceptual model development (Phase II). In conclusion, we recommend that consideration is given to a staged approach, similar to the above, to exploring the potential of deep groundwater resources associated with the Chatton Formation in the vicinity of Invercargill City. This approach seeks to maximise the value of existing hydrochemical, historical exploration and more recent airborne geophysical survey data to minimise cost and reduce the significant uncertainty surrounding a viable deep groundwater source for Invercargill City.
Land and Water Science Report 2018/32 9 Project Number: 18014
66 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
1 Introduction
A preliminary desktop study of existing information is presented in this report to better understand the potential for high yielding confined aquifer systems beneath the Southeastern Plains of Southland, associated with the East Southland Group sediments that include both the Gore Lignite Measures and the marine Chatton Formation. Given that all confined aquifers hosted by the sedimentary rocks of the Southeastern Plains will likely require treatment for water hardness, the key focus is on the reviewing information supporting the existence or otherwise of deeper aquifers capable of sustaining the high yields required for municipal supply. Other factors including the distance from current infrastructure (e.g. pipelines), the cost of water treatment, the long-term sustainability and potential environmental impacts of abstraction for municipal supply are not discussed here given they require specific knowledge of a given potential target and as such would occur at a later stage assuming a suitable target is found. Therefore, this report collates formal (reports and data sources) and informal (local knowledge) information held by district and regional authorities, Crown Research Institutes and local drilling companies. A brief review of the literature relevant to the study area is also provided.
1.1 Geological Setting Geological investigations have been undertaken in Southland which provide a good understanding of the regional setting and general stratigraphy (including but not limited to Morrison, Cooper and Partners, 1986; Isaac and Lindqvist, 1990; Rekker and Jones, 1998; Turnbull and Allibone, 2003; Stein et al., 2011). Surficial deposits of predominantly Quaternary alluvium, estuary and swamp deposits, peat and sand dunes mantle the Southern Plains. Glacial outwash from the Late Pleistocene and interglacial deposits also occur, underlain by mid to early Pleistocene weathered quartzose gravels. Rekker (2016) also noted the presence of the Waikaka Gravels a predominantly highly stratified and fine-grained with sequences of clay, carbonaceous clay, silt and sandy gravel of uncertain Pliocene to early Quaternary age. Investigations for Gore District Council indicated the presence of a medium depth semi-confined aquifer with the potential to provide moderate quantities of groundwater up to 1,500 m3/d (17 L/s) to a twin bore headwork. The most studied area is approximately 16 km from East Gore. However, the unit is restricted in extent (far south as Willowbank) and showed elevated manganese and iron and may still be susceptible to shallow contamination from leakage from the unconfined aquifer source as observed by the authors for a significant number of bores in an equivalent setting. Underlying the surficial Quaternary sediments are the East Southland Group which includes the mid- Tertiary Gore Lignite Measures and the Chatton Formation. The Gore Lignite measures are a non- marine sequence that is up to 200 m thick in places consisting of sands underlain by lignite bearing sequences of mudstones, carbonaceous mudstones and outwash channels filled with sands and gravels. Below the Gore Lignite Measures is the Chatton Formation which unconformably overlies the greywacke basement and is a marine sequence of clays, silts and sands with beds of coarser gravels and shell beds. The East Southland Group sediments are known to contain aquifers of variable continuity, thickness and permeability.
Land and Water Science Report 2018/32 10 Project Number: 18014
67 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 1: Location of the Southeastern Plains and survey blocks from Isaac and Lindqvist (1990).
1.2 Area of Interest Venture Southland provided Land and Water Science with areas of interest (AOI) to focus the investigation which included the current drinking water sources of Branxholme (current Invercargill Municipal water supply), and the Cooper’s and Jacobstown Wells (current Gore Municipal water supply), as illustrated in Figure 2. The areas of interest were selected as they are close to existing infrastructure. However, in the interest of understanding the broader hydrogeological setting, the authors of this report broadened the search area to include the Southeastern Plains from Chatton in the north, south to Waimatua and Kapuka, and as far west as the Makarewa River (Figure 1).
Land and Water Science Report 2018/32 11 Project Number: 18014
68 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 2: a) Gore water supply from two groundwater bores (Cooper’s well and Jacobstown well). b) The current Invercargill water supply is a surface water extraction from the Oreti River at Branxholme. Yellow shaded area of interest (AOI) provided by Venture Southland. The orange outline defines a 15 km radius and excludes areas of rock outcrop around Gore for which all existing borelog data was requested from Environment Southland.
Land and Water Science Report 2018/32 12 Project Number: 18014
69 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
2 Summary of Existing Information
This section provides a summary of the data sources relevant to a potential deep groundwater source for Invercargill and Gore. The data is assessed on the availability, location, format, compatibility, limitations of the dataset, and effort required to interpret the data. The focus on a deep groundwater source reflects the current limitations of the shallow alluvial aquifer system outlined above. We have separated the information into two sections covering most relevant data and indirectly relevant datasets. We note that existing groundwater data held by Environment Southland is primarily limited to the shallow alluvial aquifer system or at best, the upper units of the Gore Lignite Measures, and as such is of limited value for this review into a deep groundwater source. This reflects a lack of exploration of deeper groundwater resources across the Southeastern Plains.
2.1 Most Relevant Data Sets The following datasets and knowledge are considered most relevant to addressing the question of a viable deep groundwater source below the Southeastern Plains of Southland.
2.1.1 Geology and lignite resource investigations datasets Geology and lignite resource investigations datasets provide by far the richest set of geological and geophysical interpretations of the East Southland Group sediments. From the late 1960’s through to the late 1980’s a significant effort was expended to characterise the lignite resource of Southland’s Southeastern Plains. The valuable report of Isaac and Lindqvist (1990) summarises in considerable detail the geology and lignite resources of the East Southland group and references a large body of reports produced by the then DSIR Geology & Geophysics group during its investigation of the Southeastern Plains. The Isaac and Lindqvist (1990) report include appendices that reference the location, depth and ancillary geological and geophysical logs of c. 600 boreholes drilled across the area (see Figure 3 for an example). The work of Isaac and Lindqvist (1990) includes a high-quality conceptualisation of the depositional environment, lateral and vertical variation in the type and thickness of East Southland Group sediments and includes in many instances’ measures of downhole bulk density and porosity of strata relevant to the assessment of aquifer potential. Reference is made to the potential of the shellbed ‘coquina’ unit of the Chatton Formation as a relatively high yielding aquifer within the East Southland Group sediments (Isaac and Lindqvist (1990). Limitations are associated with extracting and digitising this rich data set so that its value, in conjunction with historical gravity and a recent airborne aeromagnetic survey of Southeastern plains, can be realised. One final limitation is associated with a maximum exploration depth of c. 200 m below ground level. Despite these limitations, data of this quality and density is seldom available to resource scientists and as such is a rare and rich source of relevant information.
Land and Water Science Report 2018/32 13 Project Number: 18014
70 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 3: Example of composite stratigraphic columns from Isaac and Lindqvist (1990) across the key search areas of the Southeastern Plains. See also Figure 1 for a spatial reference. The subdivision of the East Southland Group sediments occurs along the bottom extent of the figure.
Land and Water Science Report 2018/32 14 Project Number: 18014
71 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
2.1.2 Aeromagnetic data Aeromagnetic data is geophysical data acquired from aircraft that measure the subtle variations in the magnetic susceptibility of geological materials associated with naturally varying abundances of magnetic minerals such as magnetite. Although aeromagnetic data is insensitive to the presence of water, differing magnetic properties of certain rock types can be detected and used to infer many aspects of the subsurface geology that control the presence, quality, and flow of groundwater (Rattenbury et al., 2016). For example, aeromagnetic surveying has been proven to be successful in mapping geological structures relating to groundwater occurrence on regional scales in sedimentary terrain (Grauch, 1999; Grauch, 2001; Bemensen et al., 2013) and bedrock. Aeromagnetic data is currently being collected in the Southland Region by the New Zealand Petroleum and Minerals Team within the Ministry of Business, Innovation and Employment (MBIE), and Venture Southland (representing Environment Southland, Southland District Council, Invercargill City Council, and Gore District Council). The survey for the southern plains and northern block (north of Gore) was undertaken in 2016 by Thomson Aviation (Figure 4). The data obtained from New Zealand Petroleum and Minerals (NZP&M) is a number of raw data (.dat) files. The Southern Plains area has been interpolated into GeoTiff’s and converted into a .kml format for viewing in Google Earth (Figure 4). The current data format received by NZP&M for the area north of the Gore township is raw data files (which are currently not able to be used without further processing) and an image tiff (Figure 5). The GeoTiff file that is necessary to view in GIS software was not provided.
Figure 4: Aeromagnetic survey data for the Southland plains showing area of interest around Invercargill and Gore communities (NZP&M). Note: This survey has revealed what were formerly unknown structures beneath Invercargill City and its surrounds.
Land and Water Science Report 2018/32 15 Project Number: 18014
72 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 5: Image of the survey block north of Gore Township. This data was not available in the same format as Figure 4 from NZP&M.
The value of the data with regards to distinguishing types of rock/formations that can host groundwater, depends on the heterogeneity of the setting, specifically the difference in signals emitted by the different rock types/formations present in the area of interest (in x-y direction, but also z (depth) - data is generally averaged over hundreds of metres depth). Interpretation of aeromagnetic data requires specialist knowledge and is best guided by an experienced geophysicist and geologist. As aeromagnetic data is not designed specifically to identify aquifers, it must be used in conjunction with other data sources if its true value is to be realised. High quality bore log and geophysical measures from lignite exploration can be used as a platform for calibrating aeromagnetic survey data thereby extending its value. Upward continuation and inversion modelling of magnetic data are two key techniques that could be applied to the Southland aeromagnetic data set in order to constrain topographic variation and cross-sectional areas of East Southland Group sediments which may help constrain aquifer depth and extent. Land-based or airborne gravity data are also available via historical DSIR publications and can be used in conjunction with more recent aeromagnetic survey data to refine subsurface geology. An important observation is that the survey has revealed what were formerly unknown structures beneath Invercargill City and its surrounds, which may be of relevance to better understanding the subsurface environment as it pertains to a deep groundwater source.
Land and Water Science Report 2018/32 16 Project Number: 18014
73 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
2.1.3 Recent geological works of relevance Recent geological works of relevance include studies of the East Southland Group sediments for the purposes of reconstructing the geological past of Southland and Otago associated with the marine Chatton Formation (Lee et al., 2014; Gard, 2017). The value of this work is that it looks to reconstruct the geological past of Southland, which in turn has resulted in a better understanding of the variation in the type of geological sediments deposited (‘facies’). This knowledge has an important bearing over the possible thickness, extent and permeability of the Chatton Formation regionally. Such expert knowledge is of considerable value when used in conjunction with lignite and geophysical data sets. More recent exploration contracted by Solid Energy and L&M Mining has refined the understanding of East Southland Group sediments in the vicinity of Croydon, Mataura and Ashers-Waituna. There were two phases of drilling around the Ashers-Waituna lignite field in 2003 – 2004 and 2009 - 2010. Around 2007 Solid Energy drilled between 80 – 90 holes into the Mataura lignite field. These drill holes are believed to intersect the Chatton Formation, although the drilling information is currently confidential. Both of these studies locally augment the understanding and spatial resolution developed by the earlier lignite exploration work of the 1970s – 1980s and are located in areas relevant to the Gore District and Invercargill City. As no permits are currently held for these areas much of the information derived from these studies should be accessible through NZP&M, once clear of the time embargo on release. However, some potentially useful data sets may not be in the public domain, being held by commercial parties.
2.1.4 Hydrogeological studies Hydrogeological studies of deeper groundwater resources are scarce. However, considerable investment has been made by Gore District Council (GDC) around better understanding its local groundwater resource with technical reporting stretching back to at least 1995. The 2012 Coopers Well-field Hydrogeology study by Opus summarises efforts up to this date including the challenges facing the existing supply and an increased demand for water from the Gore township and local industries. More recent works into the potential water resources of the area include an evaluation of the potential of the shallow Waikaka Gravels that form a semi-confined aquifer and overlie the Gore Lignite Measures (Rekker, 2016). As discussed above, the Waikaka Gravels although potentially of relevance to Gore District are of restricted extent and therefore significance to Invercargill City. In additions to questions over water quality security, investment in pipeline works would also be required with conveyance from a well field in East Gore to the township over a 16 km stretch. It is the understanding of these authors that GDC has undertaken additional works some of which are currently ongoing. The master thesis by University of Canterbury postgraduate student Michele Durie (2001), titled “Hydrogeology of the Eastern Southland Plains, New Zealand” is another valuable data source and one of the few studies that explore the hydrogeology of the upper units of the Gore Lignite Measures. The Morrison, Cooper and Partners “Potable Water Supply Investigation” for the Ocean Beach Freezing works reported in 1986 is perhaps the only investigation that has specifically explored an alternative deep groundwater source for industrial supply. The work is impressive and combines surface geophysical measures with exploratory drilling, downhole geophysics, and aquifer testing to provide an unparalleled source of high-quality information. Notably, many of the personnel and the associated methods employed for this investigation mirrors those used for lignite resource exploration with the obvious difference that this work was prospecting for a high yielding aquifer. The project intercepted a relatively high yielding aquifer (maximum of 31.9 m2/d but as low as 14.8 m2/d) within the shellbed coquina aquifer of the Chatton Formation that underlies the Gore Lignite
Land and Water Science Report 2018/32 17 Project Number: 18014
74 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Measures. The thickness of the shelly coquina aquifer is reported at 39 to 55 m. Recommendations from this study included additional yield testing and further exploratory drilling to establish aquifer continuity. Here the use of the phrase ‘relatively high yielding’ relates to the benefit from the deep setting positions of the submersible pumps in deep bores. In contrast to shallow aquifers fitted with short vertical bores, the deep aquifer bores have a substantial allowance for water level decline (also known as self-induced head losses or ‘drawdown’) during pump operation. This results in shallow and deep aquifers with the same or similar transmissivity manifesting higher bore yield for the deep bore than the shallow one. Although the hydrogeological potential of the Chatton Formation has only been studied in any detail around Awarua and Green Hills areas, it is known to be regionally extensive with estimates of an area of c. 20,000 km2 across modern-day Southland and Otago representing the existence of a shallow inland sea of Late Oligocene age (Duntroonian or c. 27.3 million years old). The Chatton Sea was subsequently infilled by a series of marine transgressions that deposited the Gore Lignite Measures (Isaac and Lindqvist, 1990; Lee et al., 2014; Gard, 2017). The Chatton Formation is known to outcrop in Bluff, Waikaia, Wendon Valley, Balfour, Mandeville, Chatton, Knapdale, Dolamore Park, Waimumu, Mataura, Hedgehope, Forest Hill, Winton Hill, Woody Knoll, and Bluff. The Chatton Formation is also known from drill holes at Waimumu, Mataura, Wyndham, Waituna, Asher’s Siding and north of Bluff. Despite being widespread, reports note that outcrops and drill hole information demonstrate rapid lateral changes in facies and thickness (Isaac and Lindqvist, 1990). Isaac and Lindqvist (1980) report a thickness of 145 m of Chatton Formation units from drill hole d1134 at Kapuka; at Retreat-Croydon Road Dolamore Park it is 100 – 200 m thick, and; ranges between 55 – 61 m thick at Wyndham and Waimumu. Elsewhere the Chatton Formation is represented by only a few meters of shelly sandstone or mudstone or is completely absent. Comment provided upon review of this report (pers. comm. Rekker, November 2018) noted only one other part of the country that shell-bed coquinas have been investigated and exploited for water supply, the Aupōuri Aquifer of Northland. “Here the early Quaternary detrital sandy shell fragment layers found towards the base of the marine sequence are termed shell beds. The function of the shells is to create a macro-porosity within the sands, which increases its permeability. Thus, the shell beds effectively serve as a gallery for bore pumping to draw upon a wider area of storage from the overlying sands, and this access to vertical leakage effectively increases the bore transmissivity and hence yield considerably.” Mr Rekker raises the question of the value of this area as a case study with the more recent development of the shell-beds for avocado tree irrigation.
2.2 Indirectly Relevant Data Sets These datasets and knowledge are of limited relevance or offer indirect relevance for purposes of consenting or evaluation of potential environmental effects associated with a deep groundwater take for municipal supply.
2.2.1 GNS Science Geological investigations into the geological evolution of Southland are important sources of information. GNS Science’s, 1:250,000 QMAP product summarises the inputs of much smaller scale geological studies to produce a map of the surficial geology of Southland (Turnbull and Allibone, 2003). However, this geological layer does not provide resolution over the deep subsurface. More recently the work of Tschritter et al. (2016), also by GNS Science, developed a 3D regional geological model constructed from bore log data, surficial geology maps from the QMAP series and data from geophysical surveys. Seven major faults are represented in the 3D geological model, along with eight model units referred to as: Quaternary, Pliocene, East Southland Group, Miocene, Early Miocene, Oligocene, Eocene and Basement (Figure 6). It was planned to use the model as a basis for
Land and Water Science Report 2018/32 18 Project Number: 18014
75 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
an extensive regional groundwater model (Tschritter et al., 2016). However, the model lacks the resolution necessary for the evaluation of groundwater resources.
Figure 6: View of the Southland 3D geological model from the south (source: Tschritter et al., 2015). Cross sections of the model across the areas of interest were obtained from GNS to demonstrate the resolution of the geological model (Figure 7-9).
Land and Water Science Report 2018/32 19 Project Number: 18014
76 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 7: Location of cross sections from Southland geological model across the areas of interest.
Land and Water Science Report 2018/32 20 Project Number: 18014
77 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 8: Cross sections of Southland geological model in the Invercargill area of interest (AOI 1). These x- sectional models lack the vertical and spatial resolution necessary for evaluating deep aquifer resource potential but do provide some gross constraint over the thickness of major geological units.
Land and Water Science Report 2018/32 21 Project Number: 18014
78 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 9: Cross sections of Southland geological model in the Gore area of interest (AOI 2). These x-sectional models lack the vertical and spatial resolution necessary for evaluating deep aquifer resource potential but do provide some gross constraint over the thickness of major geological units.
Land and Water Science Report 2018/32 22 Project Number: 18014
79 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 9 continued: Cross sections of Southland geological model in the Gore area of interest (AOI 2).
These x-sectional models lack the vertical and spatial resolution necessary for evaluating deep aquifer resource potential but do provide some gross constraint over the thickness of major geological units.
2.2.2 Radiometric Survey (Gamma-ray emission) Airborne gamma-ray spectrometry measures the strength of gamma-radiation emitted from naturally occurring radioisotopes. Scintillation detectors measure the strength of gamma signal for
Land and Water Science Report 2018/32 23 Project Number: 18014
80 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
each key radio nuclei and convert it to an equivalent gamma count. The majority of the gamma radiation emitted to the atmosphere is derived from shallow depths with approximately 90% coming from the top 300 – 500 mm for dry material with a bulk density of 1.5 g cm-3 (Grasty, 1975; Wilford, 1997). Radiometric data is typically displayed using a red green blue (RGB) ternary, where red is the potassium, green is the thorium and blue is the uranium concentration (Figure 10).
Figure 10: Radiometric survey coverage over the areas of interest for deeper groundwater resources.
Generally, rock and sediments contain different abundances of radiogenic K, U and Th that equate to distinct gamma-ray spectra and gamma signal magnitude. Radiometric imagery is useful as it provides a direct measure of the surficial (300 – 500 mm) composition and character of soil and geology at a far greater resolution than afforded by polygonal soil and geological maps. Importantly, water content is a strong attenuator of gamma radiation, among other things, with areas characterised by standing water (e.g. lakes or lagoons) or shallow water tables, showing low gamma counts (dark areas on Figure 10). Whilst gamma attenuation by water is a limiting factor for exploration geologists, attenuation by water has been used to identify areas with high water contents, such as wetlands and swamps, and low-lying stream channels and floodplains with naturally elevated water tables (Bierwirth 1996; Pickup and Marks, 2000; Beamish, 2014). Organic carbon is also naturally a low emitter of gamma radiation due to a lack of mineral material, with peat deposits showing naturally low gamma.
Land and Water Science Report 2018/32 24 Project Number: 18014
81 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
For exploring deeper groundwater resources, the radiometric data is significantly limited by the shallow depth (300 - 500 mm) of the gamma signal. Whilst there is good coverage over the areas of interest, the survey has not yet been completed. This dataset has the most value for refining soil maps and defining wetland extent. The radiometric data may assist in identifying the outcropping of deeper aquifer units but overall is most directly relevant to the shallow soil environment and provides little information as to the extent or existence of deeper groundwater resources within the East Southland Group sediments.
2.2.3 Environment Southland Well Database Environment Southland maintains a ‘Well Database’ of bore or well drilling logs provided under Rule 53 of the proposed Southland Water and Land Plan (Environment Southland, 2018). Bore logs provide information on strata/lithologies present in the subsurface. Bore holes are drilled for various purposes not just for groundwater investigations with the majority of deep (>100 m) bore logs across the Southeastern Plains drilled in response to lignite exploration. When exploring for groundwater, bore logs are used to assess where groundwater bearing lithologies are present, such as gravel or fractured limestone strata. This information aids the correct positioning of the well screen during installation of the well casing through which groundwater will be drawn when pumped. Table 1 and 2 and Figures 12 and 14 summarise bore log depth ranges for the Invercargill and Gore areas that are held by Environment Southland. These tables show that there are fewer than 10 and 5 groundwater bores > 100 m in the Invercargill and Gore search areas, respectively. The lack of deep groundwater well logs is consistent with local drillers noting very little exploration or understanding of the deeper groundwater resource of the Southeastern Plains. For similar reasons, aquifer test data required for consented takes are also typically limited to shallow aquifers with a small number of pump tests available for the upper units of the Gore Lignite Measures. These pump tests typically show relatively low yields more suited to local or farm scale abstraction.
Land and Water Science Report 2018/32 25 Project Number: 18014
82 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Figure 11: Annual groundwater abstraction quantities (m3/year) in Southland.
Land and Water Science Report 2018/32 26 Project Number: 18014
83 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Table 2: Total depth (m bgl) and use of available bore log data for the Invercargill extended areas of interest (Environment Southland data, 2018).
<10 m 10 - 20 - 30 - 50 - 100 - 150 - No Total 20 m 30 m 50 m 100 m 150 m 218 m depth
Aquifer Testing 1 1
Commercial 1 1 1 2 5 Dairy Use 21 22 7 8 18 6 2 22 106
Dewatering 1 1 2
Domestic Supply 24 43 9 2 28 106
Effluent Disposal 1 1
Foundation/Investigation 2 24 7 2 35 Bore Garden 2 4 1 1 1 9 Geological Research 6 6 3 5 8 20 19 20 87
Groundwater Quality 110 13 14 137
Groundwater Remediation 7 6 13
Industrial 5 4 5 1 5 20
Irrigation 2 3 3 1 10 19
Not Used 4 3 1 1 9
Small Community Public 2 2 Supply Stock Supply 35 36 7 6 14 1 13 112
Test Bore for Irrigation 1 1
Water Level Observation 1 3 1 5
No information 30 35 5 4 2 3 19 98 Total 253 199 48 26 49 30 21 142 768
Figure 12: Bore locations by depth in the Invercargill area of interest. The majority of deeper bores (>100 m) are associated with historical lignite exploration and are not groundwater takes.
Land and Water Science Report 2018/32 27 Project Number: 18014
84 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Table 3: Total depth (m bgl) and use of available bore log data for the Gore extended areas of interest (Environment Southland data, 2018).
<10 m 10 - 20 - 30 - 50 - 100 - 150 - No Total 20 m 30 m 50 m 100 m 150 m 323 m depth
Aquifer Testing 53 12 1 5 3 1 7 82
Commercial 3 3
Dairy Use 22 11 7 13 17 2 8 80
Dewatering 21 2 23
Domestic Supply 21 15 7 4 3 10 60
Foundation/Investigation 1 1 2 Bore Garden 2 1 3
Geological Research 5 2 19 19 91 8 144
Groundwater Quality 35 4 1 2 42
Industrial 1 1 1 1 4
Irrigation 3 5 4 12
Not Used 2 1 2 5
Public Supply 4 1 3 1 2 4 15
Stock Supply 12 10 5 5 2 7 41
Test Bore for Irrigation 1 1 1 3
No information 11 4 3 4 1 1 10 34 Total 196 67 31 37 47 21 95 59 553
Figure 13: Bore locations by depth in the Gore area of interest. The majority of deeper bores (>100 m) are associated with historical lignite exploration and are not groundwater takes. Note: the high density of geological exploration bores in the vicinity of Mataura associated with historical lignite exploration.
Land and Water Science Report 2018/32 28 Project Number: 18014
85 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
2.2.4 Environment Southland Aquifer Management Zones To assist groundwater management (both quality and quantity), regional authorities often map accessible/available groundwater resources as ‘zones’ in the form of simplified polygons (Figure 14). The boundaries of these aquifers or ‘zones’ often evolve through time with more data becoming available but also with improved local understanding. These mapped aquifers are likely to be of limited use when aiming to identify new deeper groundwater resources. However, they provide insight into existing sources and the impact on shallow aquifers will need to be assessed if a deep groundwater source is to be developed for municipal supply.
Figure 14: Southland’s groundwater resources are delineated into groundwater management zones (GWMZs). The GWMZs (before 2016) were classified by Aquifer Type into lowland, riparian and terrace aquifers; the boundaries for these zones were redefined in 2016 (Hughes, 2017).
Land and Water Science Report 2018/32 29 Project Number: 18014
86 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
In Southland, Hughes et al. (2003) aggregated Southland’s regional aquifers into 25 manageable zones - groundwater management zones (GWMZs), on the basis of similarities in geology, geomorphology, groundwater-surface water interaction, and to some extent groundwater quality and level. These GWMZs were categorised as riparian, terrace and lowland aquifers to aid targeted groundwater quantity management for the Regional Water Plan for Southland (Environment Southland, 2010). In 2016, the GWMZs boundaries were updated on the basis of a better conceptual understanding of regional groundwater resources (Hughes, 2017). There are now 30 GWMZs, of which parts of the Five Rivers and Castlerock GWMZ are confined (Figure 14).
2.3 Other requested datasets Venture Southland also requested that a number of additional datasets are collated as part of this project. These include Topoclimate South soil survey, Physiographic Science, capture zones of wells and rivers. Whilst Land and Water Science has requested and reviewed these valuable datasets they are considered of limited use for the purpose of this study due to their shallow nature. However, they are a critical resource for assessing the impact on shallow aquifer and surface water bodies if a deep groundwater source is to be developed for municipal supply.
3 Deep Aquifer Working Group
A ‘Deep Aquifer’ working group has been established with involvement from Regional Authorities, Venture Southland, and local drilling contractors. The first meeting of this group was held at Venture Southland on the 17th of September 2018 and further meetings will be held if a work programme is approved. The purpose of this group is to draw together a range of experts and drillers who collectively hold many years of relevant local knowledge. The information obtained from this meeting has been incorporated into the summary of existing data sources.
4 Conclusions and Recommendations
Despite the lower cost and greater security of a deep groundwater source the existence of a high yielding and sustainable deep groundwater source beneath the Southeastern plains of Southland is largely unproven. There are few wells that intersect deeper aquifers and even fewer aquifer test data sets. The consensus from local drilling companies is that the deeper groundwater resources of the Southeastern Plains are largely unknown. Relative to the extensive and high yielding alluvial aquifer systems of the Canterbury Plains, the deeper aquifer systems of the Southeastern Plains are by their nature likely to present greater limitations in terms of yield and potability. These limitations reflect the unique geological setting of the region. The focus then becomes one of evaluating the viability of a deep groundwater source associated with one or more relatively higher-yielding aquifer units, e.g. the shellbed aquifer within the Chatton Formation, within the East Southland Group sediments. The ability to explore and refine the deep groundwater potential of the Southeastern Plains is supported by the rich data set and geological understanding of the East Southland Group sediments from decades of lignite resource assessment. This high-quality dataset, in conjunction with historical gravity and more recent airborne aeromagnetic survey data, provides an enviable source of information for ruling in or out the existence of a viable deep groundwater source(s) within the East Southland Group sediments. Notably, the only known study for a deep groundwater source beneath the Southeastern Plains, the Ocean Beach deep groundwater investigation, utilised much of this
Land and Water Science Report 2018/32 30 Project Number: 18014
87 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
historical knowledge including similar methods to identify a relatively high-yielding aquifer source north of Bluff Harbour (Morrison, Cooper and Partners, 1986). The historical geological, drill log and downhole geophysics data developed during the 1970s – 1980s has in places been locally augmented by more recent works in the vicinity of Mataura and Ashers- Waituna lignite fields. Both of these more recent studies locally enhance the density of data and the understanding of the character of the East Southland Group sediments, and more specifically the Chatton Formation, in areas relevant to Gore and Invercargill municipalities. The historical investment in the understanding of the East Southland Group sediments has the potential to greatly improve the future understanding of the deeper groundwater resource of the Southeastern Plains without the need to invest in expensive measurement or drilling. However, the integration of relevant information into a coherent data set, including digitising of all historical bore logs, expert interpretation of existing geophysical data sets and the production of a refined hydrogeological model of the groundwater system of the East Southland Group sediments and their viability for municipal or industrial supply, would require considerable investment. Possible tasks might include: • Integration and digitisation of all existing bore log and downhole geophysical data for the East Southland Group sediments into a detailed 3D model; • Refinement of the 3D architecture of the East Southland Group sediments with a focus on better defining the depth, continuity, thickness and likely permeability of aquifer units within the East Southland Group; • Correlation of 3D architecture and downhole geophysics with existing gravity and aeromagnetic data, to provide an integration surface and enhance the ability to extrapolate vertical and lateral continuity of subsurface strata including aquifer units, and; • Identification of suitable targets including their spatial location and depth.
The ultimate goal of the above work would be to utilise existing information to advance what is currently a limited understanding of the deeper groundwater potential of the East Southland Group sediments. The work would be of a desktop nature and would require a multidisciplinary team of geologists, hydrogeologists and geophysicists in order to maximise the value of the existing data set and should occur prior to consideration of costly exploratory drilling or geophysical survey. Ideally, the hydrogeologists and geologists involved in any such work would have a working knowledge of the East Southland Group sediments. The scope and investment in such a study would need to be carefully weighed given the potential that a great deal of effort could go into processing / analysing information without the provision of much additional value to municipal interests. Therefore, the recommendations of this report include a phased approach: Phase I. In light of the costs of surface water options, the viability of the Chatton Formation shell- bed aquifer beneath Invercargill City should be evaluated. The proposed steps constitute a stop/go for evaluation:
• Evaluation of likely hardness and hydrochemical composition of waters abstracted from carbonate aquifers regionally and if possible, the Chatton Formation aquifer. Evaluate and supply data to water treatment engineers to assess a per cubic meter treatment cost. - Estimated cost: $9,300 - $13,100
Land and Water Science Report 2018/32 31 Project Number: 18014
88 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
Phase II. Compilation and digitising of existing geological, down hole geophysical and more recent geophysical survey data (aeromagnetics) within a 15 km radius of Invercargill City to generate a conceptual model (hydrostratigraphic model) of the Chatton Formation beneath Invercargill City. Recommendation or otherwise of drilling targets by a team of recognised experts. - $100,000 - $137,000 Phase III - IV. Exploratory drilling and/or pilot well drilling and aquifer testing. • Scenario 1 (Phase III): exploratory drilling prior to pilot well drilling (based on estimates from exploration geologists and drilling operators): - Exploratory drilling: $80,000 - $100,000 per drill hole - Pilot well and aquifer testing: $230,000 - $440,000 per well • Scenario 2 (Phase IV): Pilot well drilling only and aquifer testing - Pilot well and aquifer testing: $230,000 - $440,000 per well Exploratory drilling provides much more detailed information as to the subsurface stratigraphy than provided by the methods used for well drilling. The need for exploratory drilling should be clearer following conceptual model development (Phase II). In conclusion, we recommend that consideration is given to a staged approach, similar to the above, to exploring the potential of deep groundwater resources associated with the Chatton Formation in the vicinity of Invercargill City. This approach seeks to maximise the value of existing hydrochemical, historical exploration and more recent airborne geophysical survey data to minimise cost and reduce the significant uncertainty surrounding a viable deep groundwater source for Invercargill City.
Land and Water Science Report 2018/32 32 Project Number: 18014
89 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
5 Appendix: Indicative Costing
Table 4. Indicative Cost Estimate for Phase 1 - 4
Min Max Diff.
Phase 1 Evaluation of likely hardness and hydrochemical composition for the Chatton Formation aquifer
Liaison and follow up with water treatment engineers 300.00 700.00 400.00 Measures required for assessment of potability Liaison throughout project as required
Water testing / Sampling Sampling of Chatton Formation aquifer for water analysis 2,000.00 2,500.00 500.00 (Ocean Beach Bore or equivalent that draws from Chatton Formation)
Compilation of existing hydrochemical data from carbonate aquifers regionally 3,200.00 4,000.00 800.00 Compilation of existing hydrochemical data from carbonate aquifers regionally Compilation of hydrochemical data from shell bed aquifers nationally
Hydrochemical analysis of data from carbonate aquifers regionally and nationally 3,200.00 4,000.00 800.00 Quantify acidity, hardness, mineral saturation and gas concentrations Statistical assessment of the range and variability of hydrochemical measures
Produce Report for ICC and Water Treatment Engineers 1,000.00 1,200.00 200.00
9,700.00 12,400.00 2,700.00
Phase 2 Conceptual model development for exploratory and/or pilot well drilling 15,000.00 20,000.00 5,000.00 Compile and digitise geological and geophysical data sets 80,000.00 110,000.00 30,000.00 Hydrostratigraphic analysis and model building 5,000.00 7,000.00 2,000.00 Reporting and recommendation of drilling targets 100,000.00 137,000.00 37,000.00 - Phase 3 *Exploratory Drilling (per bore) Drilling rig establishment fee, drilling costs of up to $300/m 65,000.00 100,000.00 35,000.00 per hole, core recovery, geological logging on a per hole - basis. Analysis of drill log and updating of hydrostratigraphic models 15,000.00 25,000.00 10,000.00 for refinement of targeting.
80,000.00 125,000.00 45,000.00
Phase 4 **Pilot well and aquifer testing (per well) Pilot well drilling and aquifer testing (per well) 200,000.00 400,000.00 200,000.00
Pump test analysis, yield and well interference. 30,000.00 40,000.00 100,000.00
230,000.00 440,000.00 210,000.00
*Exploratory drilling recovers rock and sediment materials and provide a better understanding of the stratigraphy of the subsurface environment. However, these holes are not used for abstraction of water nor can they be used for pump test analysis. **Pilot well drilling does not provide the same resolution over the subsurface environment but is likely a cheaper option and enables aquifer testing to be undertaken.
The value of exploratory drilling is a much better understanding of the subsurface environment. However, it is expensive and its value must be weighed against the savings associated with opting to underake pilot well drilling only. The cost estimate Min. Max. Estimated Total Cost if exploratory drilling included: 419,700.00 714,400.00 Estimated Total Cost if exploratory drilling excluded: 339,700.00 589,400.00
Land and Water Science Report 2018/32 33 Project Number: 18014
90 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
6 References
Beamish, D. (2015). Relationships between gamma-ray attenuation and soils in SW England. Geoderma, 259-260, 174-186. Bemensen, I.E., Godwin, O.A., Kenechukwu, A.E., Ifeanyi, C.A., Ojonugwa, U.A., and Chukwunonso, O.C. (2013). Spectral analysis of aeromagnetic data over part of the Southern Bida basin, West-Central Nigeria: International Journal of Fundamental Physical Sciences v. 3/2, p. 27- 31. Bierwirth, P.N (1996). Investigation of airborne gamma-ray images as a rapid mapping tool for soil and land degradation - Wagga Wagga, NSW. Record 1996/22. Australian Geological Survey Organisation. Durie, M. (2001). Hydrogeology of the Eastern Southland Plains, New Zealand. University of Canterbury M.Sc Thesis. Environment Southland (2010). Regional Water Plan for Southland, 2010. Environment Southland publication number 2010-03, March 2010. ISBN 0-909043-40-X. Environment Southland (2018). Proposed Southland Water and Land Plan (Decisions version). Environment Southland publication number 2018-03, April 2018. ISBN 978-0-909043-25-4. Gard, H. J. L. (2017). Sedimentology, paleoecology and paleogeography of the shallow marine Chatton Formation, southern New Zealand. University of Otago M.Sc Thesis. Retrieved from http://hdl.handle.net/10523/7230. Grasty, R.L. (1975). Atmospheric absorption of 2.62 MeV gamma ray photons emitted from the ground. Geophysics 40: 1058–1065. Grauch, V.J.S. (2001). High-resolution aeromagnetic data, a new tool for mapping intrabasinal faults: Example from the Albuquerque basin, New Mexico: Geology, v. 29/4, p. 367-370. Grauch, V.J.S., Hudson, M.R. and Minor, S.A. (2001). Aeromagnetic expression of faults that offset basin fill, Albuquerque basin, New Mexico: Geophysics, v. 66, p. 707-720. Hughes, B. (2003). Proposed framework for groundwater allocation in the Southland Region. Environment Southland unpublished report. 60p. Hughes, B., Harris, S., and Brown, P., (2011). Mataura Catchment Strategic Water Study. Report prepared for Environment Southland. 240p. Hughes, B. (2017). Groundwater provisions of the proposed Southland Water and Land Plan: Technical background. Lyttelton, New Zealand: Land Water People. Publication no. LWP17063. Isaac, M.J. and Lindqvist, J.K. (1990). Geology and lignite resources of the East Southland Group, New Zealand. New Zealand Department of Scientific and Industrial Research. New Zealand Geological Survey Bulletin 101. 203p. Lee, D.E., Lindqvist, J.K., Beu, A.G., Robinson, J.H., Ayress, M.A., Morgans, H.E.G., and Stein, J.K. (2014). Geological setting and diverse fauna of a Late Oligocene rocky shore ecosystem, Cosy Dell, Southland. New Zealand Journal of Geology and Geophysics, 57(2): 195-208. Ministry for the Environment and Stats NZ (2017). New Zealand’s Environmental Reporting Series: Our atmosphere and climate 2017. Retrieved from www.mfe.govt.nz Morrison, Cooper and Partners. (1986). The Ocean Beach Freezing Company Limited Potable Water Supply Investigations. Morrison, Cooper and Partners, Invercargill. 128p.
Land and Water Science Report 2018/32 34 Project Number: 18014
91 Infrastructure and Services Agenda - UNDERGROUND WATER SUPPLY EXPLORATION FOR EMERGENCY ALTERNATIVE SOURCE
MWH. (2000). Invercargill City Council Scoping Investigation of Water Supply Alternatives. Montgomery Watson Report prepared for Invercargill City Council. Dunedin. Pickup, G., and Marks, A. (2000). Identifying large-scale erosion and deposition processes from airborne gamma radiometrics and digital elevation models in a weathered landscape. Earth Surf. Process. Landforms, 25: 535–557. Rattenbury, M.S., Cox, S.C., Edbrooke, S.W. and Martin, A.P. (2016). Integrating airborne geophysical data into new geological maps of New Zealand mineral provinces. p.37-44 IN: Christie, A.B. (ed) Mineral deposits of New Zealand: exploration and research. Carlton, Vic.: Australasian Institute of Mining and Metallurgy. Monograph series (Australasian Institute of Mining and Metallurgy) 31. Rekker, J.H. and Jones, A.F. Jones. (1998). Central Southland Plains Groundwater Study; Results from Field Surveys and Assessment. Report prepared for Southland Regional Council. AquaFirma Ltd, Dunedin. 29p. Rekker, J.H. (2016). Waikaka Gravels Water Resource for Gore District Council Report 1061-1-R1 Lincoln Agritech Ltd 28 April 2016. Rissmann, C., Pearson, L., Lindsay, J., Couldrey, M., and Lovett, A. (2018). Application of Physiographic Science to the Northland Region: Preliminary Hydrological and Redox Process- Attribute Layers. Land and Water Science Report 2018/11. p88. Stein, J., Craw, D., and Pope, J. (2011). Initial sedimentation and subsequent diagenesis in the Eastern Southland Lignite Basin, southern New Zealand. New Zealand Journal of Geology and Geophysics, 54(2): 167-180.
Tschritter, C., Rawlinson, Z.J., Barrell, D.J.A., Alcaraz, S. (2016). Three-dimensional geological model of Environment Southland’s area of interest for freshwater management. GNS Science Consultancy Report 2015/123. 74p. Turnbull, I.M. and Allibone, A.H. (compilers) (2003). Geology of the Murihiku area. Institute of Geological and Nuclear Sciences Limited. 1:250 000 geological map 20. 1 sheet and 74 p. Lower Hutt, New Zealand. Wilford, J.R., Bierwith, P.N., and Craig, M.A. (1997). Application of airborne gamma-ray spectrometry in soil/regolith mapping and applied geomorphology. AGSO Journal of Australian Geology and Geophysics 17(2):201-216.
Land and Water Science Report 2018/32 35 Project Number: 18014
92 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: MICHELE FREY – ACTING PARKS MANAGER
MEETING DATE: MONDAY 25 FEBRUARY 2019
OMAUI RESERVE EASEMENT
SUMMARY
A legal right of way easement is required over part of Omaui Reserve to address the current encroachment of an existing driveway at 182 Mokomoko Road, Omaui. This will enable continued access through Council’s Reserve to the neighbouring property. Confirming this legal right of way easement will subsequently enable Council to change Omaui Reserve classification status from Recreation to Scenic as per the 2011 Environmental Reserves Omnibus Management Plan. The process of obtaining an easement under the Reserves Act 1977 required public notification; with no submissions having been received at the closing date of 30 November 2018. Approval from Council is sought as per the recommendations.
RECOMMENDATIONS
That the report Omaui Reserve Easement be received
AND
That a right of way easement over Omaui Reserve adjoining the property at 182 Mokomoko Road, Omaui, as per Policy 5.6.9.3.1 “Occupation Agreements” (page 83) in the Environmental Reserves Omnibus Management Plan be granted
AND
That a change in classification from Recreation to Scenic Reserve is gazetted as per Policy 5.6.9.1.2 “Classification” (page 82) in the Environmental Reserves Omnibus Management Plan.
IMPLICATIONS
1. Has this been provided for in the Long Term Plan/Annual Plan? N/A. 2. Is a budget amendment required? No. 3. Is this matter significant in terms of Council’s Policy on Significance? No.
93 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
4. Implications in terms of other Council Strategic Documents or Council Policy? No. 5. Have the views of affected or interested persons been obtained and is any further public consultation required? Consultation via the Reserves Act 1977 has been carried out with no submissions received. 6. Has the Child, Youth and Family Friendly Policy been considered? Yes.
FINANCIAL IMPLICATIONS
All costs associated with the proposal will be at the expense of the applicant.
OMAUI EASEMENT
Background - Environmental Reserves Omnibus Management Plan 2011
The Environmental Reserves Omnibus Management Plan was adopted by Council in 2011. Within this plan, Section 5.6 Omaui Reserve - Policy 5.6.9.3.1 Occupation Agreements states “To continue consultation with adjoining land owners to come to a solution for legal easement and encroachments on Omaui Reserve.”
At the same time Council intended to change the classification of the Reserve from Recreation to Scenic because a Scenic Reserve classification for Omaui Reserve is more appropriate due to the environmental nature of the reserve.
Section 5.6 Omaui Reserve - Policy 5.6.9.1.2 Classification states “Council aims to manage Omaui Reserve as a Scenic Reserve pursuant to Section 19 of the Reserves Act 1977. A request will be made to the Minister to have Omaui Reserve classified as a Scenic Reserve as defined in Section 19 of the Reserves Act.”
Scenic classification is defined as being for the purpose of preserving the indigenous flora and fauna, indigenous associations and natural environment and beauty for the benefit, enjoyment and use of the public (refer to Appendix 1).
The Minister of Conservation refused Council’s request for the change of classification as formalised agreements around the existing historic encroachments (access issues) had not been resolved.
Initial consultation regarding the easement and classification change took place through the Management Plan development process in 2011, with any submissions received addressed at the time.
Council now intends to legally formalise the one remaining encroachment (creating a right of way easement) in order to attain Scenic Reserve Classification through the Minister of Conservation.
94 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
An easement was considered the best legal option for addressing the driveway that had possibly already existed at the time Council became owners of the reserve and is required in order for the adjoining owners to legally access their property while maintaining access to the reserve for the benefit of public enjoyment.
Please refer to Appendix 2 to see the policies relating to the easement from the Environmental Reserves Omnibus Management Plan 2011.
Consultation of the Proposed Easement at 182 Mokomoko Road
Public notice of granting the easement over reserve land is required under Section 48(2) of the Reserves Act 1977.
A public notice was advertised calling for submissions on Saturday 27 October and Saturday 24 November 2018. No submissions were received during this period which ended Friday 30 November 2018. Copies of the consultation documents are attached (refer to Appendix 3).
Next Steps - Change in Classification
If Council approves granting a right of way easement over part of Omaui Reserve then the draft easement can be enforced and the process to change Omaui Reserve classification from Recreation to Scenic can proceed as per the Management Plan.
At the time the Management Plan was adopted by Council, Local Authorities were required to apply to the Minister for permission to change the classification of reserves. Legislation has since changed and the Minister of Conservation has now provided Council with delegated authority to change classification without the Minister’s consent.
A Scenic Reserve classification is the more appropriate classification for Council to manage Omaui Reserve (under Section 19 of the Reserves Act 1977) than the current Recreation classification due to the environmental nature of the reserve.
After the easement is registered against the record of title then Council will gazette the change in classification.
CONCLUSION
A formalised agreement re-enforces Council's intent to protect reserve land for continued public enjoyment and use. Subsequent Scenic Reserve classification will allow Council to manage the reserve land more appropriately due to the environmental nature of the reserve.
**********
95 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
APPENDIX 1
Reserves Act 1977 - Section 19 Scenic Reserves
(1)
It is hereby declared that the appropriate provisions of this Act shall have effect, in relation to reserves classified as scenic reserves—
(a) for the purpose of protecting and preserving in perpetuity for their intrinsic worth and for the benefit, enjoyment, and use of the public, suitable areas possessing such qualities of scenic interest, beauty, or natural features or landscape that their protection and preservation are desirable in the public interest:
(b) for the purpose of providing, in appropriate circumstances, suitable areas which by development and the introduction of flora, whether indigenous or exotic, will become of such scenic interest or beauty that their development, protection, and preservation are desirable in the public interest.
(2)
It is hereby further declared that every scenic reserve classified for the purposes specified in subsection (1)(a) shall be so administered and maintained under the appropriate provisions of this Act that—
(a) except where the Minister otherwise determines, the indigenous flora and fauna, ecological associations, and natural environment and beauty shall as far as possible be preserved, and for this purpose, except where the Minister otherwise determines, exotic flora and fauna shall as far as possible be exterminated:
(b) the public shall have freedom of entry and access to the reserve, subject to the specific powers conferred on administering bodies by sections 55 and 56, to any bylaws under this Act applying to the reserve, and to such conditions and restrictions as the administering body considers to be necessary for the protection and well-being of the reserve and for the protection and control of the public using it:
(c) to the extent compatible with the principal or primary purposes of the retention and preservation of the natural or scenic values, open portions of the reserve may be developed
96 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
for amenities and facilities where these are necessary to enable the public to obtain benefit and enjoyment from the reserve:
(d) where historic, archaeological, geological, biological, or other scientific features are present in the reserve, those features shall be managed and protected to the extent compatible with the principal or primary purpose of the reserve: provided that nothing in this paragraph shall authorise the doing of anything with respect to fauna that would contravene any provision of the Wildlife Act 1953 or any regulations or Proclamation or notification under that Act, or the doing of anything with respect to archaeological features in any reserve that would contravene any provision of the Heritage New Zealand Pouhere Taonga Act 2014:
(e) to the extent compatible with the principal or primary purpose of the reserve, its value as a soil, water, and forest conservation area shall be maintained.
(3)
It is hereby further declared that every scenic reserve classified for the purposes specified in subsection (1)(b) shall be so administered and maintained under the appropriate provisions of this Act that—
(a) except where the Minister otherwise determines, the flora and fauna, ecological associations, and natural environment and beauty shall as far as possible be preserved:
(b) the public shall have freedom of entry and access to the reserve, subject to the specific powers conferred on administering bodies by sections 55 and 56, to any bylaws under this Act applying to the reserve, and to such conditions and restrictions as the administering body considers to be necessary for the protection and well-being of the reserve and for the protection and control of the public using it:
(c) to the extent compatible with the principal or primary purposes of the retention and preservation of the natural or scenic values, open portions of the reserve may be developed for amenities and facilities where these are necessary to enable the public to obtain benefit and enjoyment from the reserve:
(d)
97 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
where historic, archaeological, geological, biological, or other scientific features are present in the reserve, those features shall be managed and protected to the extent compatible with the principal or primary purpose of the reserve: provided that nothing in this paragraph shall authorise the doing of anything with respect to fauna that would contravene any provision of the Wildlife Act 1953 or any regulations or Proclamation or notification under that Act, or the doing of anything with respect to archaeological features in any reserve that would contravene any provision of the Heritage New Zealand Pouhere Taonga Act 2014:
(e) to the extent compatible with the principal or primary purpose of the reserve, its value as a soil, water, and forest conservation area shall be maintained.
Compare: 1953 No 69 ss 33, 56
Section 19(2)(d) proviso: amended, on 20 May 2014, by section 107 of the Heritage New Zealand Pouhere Taonga Act 2014 (2014 No 26).
Section 19(3)(d) proviso: amended, on 20 May 2014, by section 107 of the Heritage New Zealand Pouhere Taonga Act 2014 (2014 No 26).
98 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
APPENDIX 2
ENVIRONMENTAL RESERVES OMNIBUS MANAGEMENT PLAN 2011 – OMAUI RESERVE POLICIES 5.6.9 PAGES 82/83
5.6.9.1 Classification
While Omaui Reserve is presently classified as Recreation Reserve, it is foreshadowed that, as a consequence of this Management Plan, application shall be made to the Minister for the area to be classified as a Scenic Reserve.
This would not inhibit public use of the reserve but would recognise the importance of the preservation of the vegetation to the local community.
Objectives:
To protect, preserve and enhance the intrinsic values of Omaui Reserve as a forest remnant.
To apply to Minister of Conservation to have Omaui Reserve classified as a Scenic Reserve as defined in Section 19 of the Reserves Act.
Policies:
5.6.9.1.1 Omaui Reserve shall be managed as a Recreation Reserve pursuant to Section 17 of the Reserves Act 1977.
5.6.9.1.2 Council aims to manage Omaui Reserve as a Scenic Reserve pursuant to Section 19 of the Reserves Act 1977. A request will be made to the Minister to have Omaui Reserve classified as a Scenic Reserve as defined in Section 19 of the Reserves Act 1977.
5.6.9.3 Occupation Agreements
Policy:
5.6.9.3.1 To continue consultation with adjoining land owners to come to a solution for legal easement and encroachments on Omaui Reserve. Consultation will include a formal agreement for linking access to (DOC) Omaui Scenic Reserve.
99 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
APPENDIX 3
100 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
101 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
102 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
103 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
104 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
105 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
106 Infrastructure and Services Agenda - OMAUI RESERVE EASEMENT
107 Infrastructure and Services Agenda - STORAGE BUILDING ON RACECOURSE ROAD
TO: INFRASTRUCTURE AND SERVICES COMMITTEE
FROM: MICHELE FREY – INTERIM PARKS MANAGER
MEETING DATE: MONDAY 25 FEBRUARY 2019
STORAGE BUILDING ON RACECOURSE ROAD
SUMMARY
At its Infrastructure and Services Committee meeting on 9 July 2018, Council approved construction of a storage shed at the Parks Racecourse Road depot. Funding for the building was approved from existing budgets in the sum of $200,000 with the balance from the sale of Council’s Bond Street property to the sum of $37,000. Work has commenced on the property and unforeseen costs have arisen to the value of $68,000.
RECOMMENDATION
That report Storage Building on Racecourse Road be received
AND
That construction works on the Racecourse Road storage building continue on the basis that all materials are available and no further unforeseen associated construction costs are anticipated.
IMPLICATIONS
1. Has this been provided for in the Long Term Plan/Annual Plan? Yes. 2. Is a budget amendment required? No. 3. Is this matter significant in terms of Council’s Policy on Significance? No. 4. Implications in terms of other Council Strategic Documents or Council Policy? N/A. 5. Have the views of affected or interested persons been obtained and is any further public consultation required? N/A. 6. Has the Child, Youth and Family Friendly Policy been considered? N/A.
108 Infrastructure and Services Agenda - STORAGE BUILDING ON RACECOURSE ROAD
FINANCIAL IMPLICATIONS
Further funding is required to complete the building construction due to unforeseen issues discovered during initial site works in the sum of $68,000, with this additional funding to come from Parks capital budgets.
RACECOURSE ROAD STORAGE SHED COST UPDATE
Racecourse Road Storage Shed site was purchased in 2001. Significant building work has been undertaken across the site since purchase of the property.
In 2018 a proposal was presented to Council by the then, Parks Manager for the construction of a storage shed on this site. At its Infrastructure and Services Committee meeting on 9 July 2018, Council approved construction.
Following approval of funding, the contractor Calder Stewart was engaged and commenced manufacture of the materials to the specifications for this particular building. The contractor has all materials available either on site at Racecourse Road or at their premises ready for construction of the building.
Calder Stewart prepared and obtained land use consent for the construction of the building (RMA2018/159) in October 2018. Initial site works commenced in December 2018.
The contract allowed for excavation for foundations up to 200mm deep, and backfill and binding up to 300mm deep.
Exclusions in the contract included soft spot excavation and backfill; and removal and dumping of contaminated fill.
Upon commencement of site works, it was discovered that there was additional subsurface concrete from previous owners/users of the property and the possibility of contaminated soil.
A resource consent application was prepared and granted for the removal of contaminated spoil (RMA2018/195) in January 2019. As part of the consenting process, soil testing was required to determine any contamination. Results from the testing showed contamination levels which meant approximately 30 tonne of spoil had to be removed and replaced with hardfill.
Subsequent to discovering this material/potentially contaminated soil the Interim Parks Manager was made aware that site contamination testing was undertaken by Southern Chemical Consultants in 2000 indicating levels of contamination warranting a recommendation for further detailed assessment. No further detailed assessments have been retrieved from archives suggesting that a further detailed assessment was not undertaken.
The remediation of the site to address soil contamination and additional subsurface concrete is the primary reason for the unforeseen cost.
Work on the site has been halted while the reasons for the extra costs and the amounts involved have been verified.
The information relating to potential soil contamination has now been located and the extra foundation works are appropriate.
109 Infrastructure and Services Agenda - STORAGE BUILDING ON RACECOURSE ROAD
Options
1. Restart work and complete the project. The project will be completed including the extra cost.
2. Cancel the contract and the project. The contract in place for the storage shed requires payment for all work done to date and materials already on site. The exit cost of the contract would be significant, no shed would be built and Council would still have storage requirements.
It is therefore recommended to proceed with the construction.
CONCLUSION
It is anticipated the above extra works will amount to a cost of $68,000 and it is proposed that this is funded from Parks capital budgets.
**********
110