Appendix C: Adjoining land use information

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Te Rāhui Herenga Waka Whakatāne Detailed site investigation

0202 Te Rāhui Herenga Waka Whakatāne - Detailed Site Investigation Report - (FINAL) January 2022.docx Page 41 17 January 2022

Appendix C: Adjoining land use information

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WHK_20 WHK_21 WHK_22

WHK_23 WHK_24 WHK_25

WHK_25 WHK_26

WHK_26

WHK_27 WHK_28

WHK_29

WHK_30

WHK_32 WHK_33

WHK_34 WHK_35

WHK_36

WHK_37

WHK_38 WHK_39

WHK_40 WHK_41

WHK_47

WHK_51

WHK_52

Whakatane Sawmill Wood Waste Sites Northern Sector

CROWN COPYRIGHT RESERVED GSP-526291 Printed 21/09/2016

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HAIL Land Use Site Details

Description

The land use history has been confirmed. The site has been confirmed as one that appears on the Hazardous Activities and Industries List (copy attached). The information used in making this classification of the site

contamination status is available in file 1881/0044/000 held by Whakatane District and file 7000-06-WH39 held by Bay of Plenty Regional Council.

Land Use

Waste disposal to land (excluding where biosolids have been used as soil conditioners)

Other Information

12 July 2019 ±ODQGXVHFRQVHQWWRHVWDEOLVKDQGRSHUDWHDFOHDQILOOVLWHDW&.HHSD5RDG&RDVWODQGV:KDNDWŅQH District Council consent: LL-2019-8991-00)

The application report included an NES:CS assessment and identified the site as a managed contaminated site containing treated wood waste material. Geotechnical investigations have identified the current depths of cleanfill capping over the contaminated material which are sufficient. With the cleanfill operation, it is proposed to maintain a capping layer of at least 1 m to ensure adequate separation to avoid disturbing the contaminated material. However, It is not described how the 1 m cap depth will be maintained or if the cap will be visually separated from the cleanfill material for contractors removing cleanfill in the future. BOPRC recommends the use of a visual barrier i.e. geotextile fabric to warn contractors to not go any deeper otherwise the contractors risk exposing the contaminated material.

Update Record List

Site ID : LUR-WHK-00039 Printed : 23/07/2019

LUR-WHK-00039-CH01

Section 2 SO 477337 Section 3 SO 477337 Section 4 SO 477337 Section 5 SO 477337 Lot :

Keepa Road, Coastlands, Whakatane District Site Address:

Managed for Land Use - Industrial Commercial Site Classification :

Page 1 of 2 ReportI D: BRCPPRRP001

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The enclosed information is derived from the Whakatane District Council and Bay of Plenty Regional Council's Selected Land Use register and is made available to you under the Local Government Official and Information Meetings Act 1987 (LGOIMA), Building Act 1991 or Privacy Act 1993.

The database has been established by the Whakatane District Council and Bay of Plenty Regional Council for the purpose of performing its functions under the Resource Management Act 1991.

It has been compiled in accordance with national Site Classification and Information Management Protocols for Land Contamination.

This information reflects the Whakatane District Council and Bay of Plenty Regional Council's current understanding of this site. The Whakatane District Council, the Bay of Plenty Regional Council and their officers, employees and agents accept no liability for any inaccuracy in, or omission from, this information; or liability for any loss of damage suffered by any person which may directly or indirectly result from any person acting or refraining from acting on this information. This information has been prepared fo the recipient to whom it is addressed and is intended for the recipient's use only. This is not intended to be relied on by any other party. The provisions of the Privacy Act 1993 bind the recipient of this information.

The key report for this site is µDelineation & Risk Assessment Mill Waste Disposal Site 38 (a) and 38 (b) - Orini Gate Access Track, Gulf Resource Management Ltd, February 2004¶

This report concluded that:

Former mill waste has been verified at this site. Further investigation was recommended in order to fully delineate the waste footprint and characterise any potential contaminant migration from this site.

The waste at this site is assumed to contain levels of dioxins that may be detrimental to human health if direct exposure were to result. The health impact will be dependant on factors such as frequency and duration of exposure, the concentration of the contaminant and health status of the person influenced. Additional former mill waste

contaminants have not been assessed however there is a likelihood of other mill waste derived contaminants existing at this site.

It is considered that a significant dermal contact pathway is present for assumed PCP and dioxin contaminants within former mill wastes at this site in its present state (some areas with no cover). For risk to exist receptors need to frequent this site on a regular basis. At present the degree the site is accessed by the public is not fully

understood however the potential for public access exists.

µSoil Profile Survey to Determine Depth of Wood Waste at Keepa Road Site, Waiora Soil Conservation Ltd, 8 September 2004¶

This survey fully defined the boundaries of the wood waste footprint.

A site Management Plan has been developed to ensure that the risk to human health and the environment from PCP and dioxin contaminated fill material at this site is appropriately managed. Potential owners and/or occupiers of the site should familiarise themselves with the Management Plan.

Page 2 of 2 ReportI D: BRCPPRRP001

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Selected Land Use Site Details

25-Mar-09 03:02 p.m.

Lot: Allot 216 Rangitaiki Parish Certificate of Title:

Address: Orini Gate Access Track of Keepa Road

Town: WHAKATANE

The site has been investigated. Investigations indicate that there are hazardous substances present at the site (based on Soil Guideline Values for Selected Contaminants Associated with Former Mill Waste in Whakatane, Land Care Research), BUT indicate that any risks to people and the environment are managed so that any adverse effects or risks to people and the environment are considered to be so low as to be acceptable. The information used in making this classification of the site contamination status is available in File(s)

1881/0044/000 held by Whakatane District Council and File(s) 7000 06 WH39 held by Bay of Plenty Regional Council.

The 'Management Required' category describes sites that have contaminant levels present that restrict some land-uses but are acceptable for the current land-use by way of management controls to restrict exposure to contaminants. Potential occupants of the site should familiarise themselves with the particular management controls for this site. Note a change of land-use or zoning change will result in the review of the category assignment for this site.

The enclosed information is derived from the Whakatane Council and Bay of Plenty Regional Council’s Selected Land Use Register and is made available to you under the Local Government Official Information and Meetings Act 1987, Building Act 1991 or Privacy Act 1993.

The database has been established by the Whakatane Council and Bay of Plenty Regional Council for the purpose of performing its functions under the Resource Management Act 1991.

It has been compiled in accordance with national Site Classification and Information Management Protocols for Land Contamination.

This information reflects the Whakatane Council and Bay of Plenty Regional Councils current understanding of this site. The Whakatane Council and Bay of Plenty Regional Councils and their officers, employees and agents accept no liability for any inaccuracy in, or omission from, this information or liability for any loss or damage suffered by any person which may directly or indirectly result from any person acting or refraining from acting on this information. This information has been prepared for the recipient to whom it is addressed and is intended for that recipient’s use only. It is not intended to be relied on by any other party. The provisions of the Privacy Act 1993 bind the recipient of this information.

This record was updated on 27 Feb 2009.

Site No: WHK_39 VNZ Roll No: 07111-011-00

Category: Management Required Land Use Details

Classification Date: 1/12/2008 HAIL Land Use: Waste storage, treatment and/or disposal

Records show this site was used as a Waste Storage, Treatment And/or Disposal site over an unknown period.

The key report for this site is ‘Delineation & Risk Assessment Mill Waste Disposal Site 38 (a) and 38 (b) - Orini Gate Access Track, Gulf Resource Management Ltd, February 2004’.

This report concluded that:

Former mill waste has been verified at this site. Further investigation was recommended in order to fully delineate the waste footprint and characterise any potential contaminant migration from this site.

The waste at this site is assumed to contain levels of dioxins that may be detrimental to human health if direct exposure were to result. The health impact will be dependant on factors such as frequency and duration of exposure, the concentration of the contaminant and health status of the person influenced. Additional former mill waste contaminants have not been assessed however there is a likelihood of other mill waste derived contaminants existing at this site.

It is considered that a significant dermal contact pathway is present for assumed PCP and dioxin

Other Information Site No: WHK_39

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contaminants within former mill wastes at this site in its present state (some areas with no cover). For risk to exist receptors need to frequent this site on a regular basis. At present the degree the site is accessed by the public is not fully understood however the potential for public access exists.

‘Soil Profile Survey to Determine Depth of Wood Waste at Keepa Road Site, Waiora Soil Conservation Ltd, 8 September 2004’.

This survey fully defined the boundaries of the wood waste footprint.

A site Management Plan has been developed to ensure that the risk to human health and the environment from PCP and dioxin contaminated fill material at this site is appropriately managed. Potential owners and/or occupiers of the site should familiarise themselves with the Management Plan.

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MEMORANDUM

To: Steve Pickles

Team Leader Pollution Prevention

From: Paul Futter Date:9 September 2008

Senior Project Implementation Officer

File Ref: 7000 06 K01

Subject: Keepa Road Pump Station Sampling

This memo provides the results of the sampling as part of the investigation into dioxin movement from the Kopeopeo Canal to the Whakatane River via the Keepa Road Pump Station. The intent of the sampling was to check if the pump was acting as a significant mechanism for movement of dioxin contaminated sediment from the Kopeopeo Canal.

Sediment Sampling

The sediment sampling of Kopeopeo Canal Flood pump drain and adjacent wetland was undertaken by Stephen Park, Senior Environmental Scientist.

Below is a graphic showing the location of the sub-samples that contributed to the two composite samples collected on 16 July 2008 and sent to AsureQuality laboratory in Upper Hutt for OCDD dioxin screening.

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Keepa Road Pump Station Sampling

9 September 2008 2

Initially it was intended to take cores in the drain but the depth of soft sediment near the pump is very shallow with insufficient depth of soft accumulated sediment for that method of collection.

Instead replicate samples of the surface sediment were taken. At the pump end of the drain the sub-samples were taken down to a depth of 2 - 5 cm, and sampled at 10 cm towards the river where slightly deeper soft sediment was found. Off to the sides of the drain the samples were taken to a depth of 10 cm. The composite sample from the drain (lab number 084191) consisted of 5 sub-samples while the adjacent wetland composite sample (lab number 084192) consisted of 10 sub-samples.

Sediment from both samples consisted of fine sediment falling within the clay and silt particle size range.

The complete analytical results reports are attached. The drain composite sample (084191) returned a dioxin result of 1.29 I-TEQ ng/kg and the wetland composite sample (084192) returned a result of 0.562 I-TEQ ng/kg. This is similar to previous Whakatane estuary sampling in October 2004, which returned a value of 1.1 I-TEQ ng/kg and compares to the MfE national estuaries sediment median (n=26) of 0.280 I-TEQ ng/kg.

The current and previous Whakatane Estuary sediments contain moderate levels compared to other New Zealand measurements. The New Zealand maximum value of 2.71 I-TEQ ng/kg was recorded in upper Hellyers Creek, Auckland.

In summary, if significant levels of dioxin are discharging via the Keepa Road pump station then they are not settling out in the area.

Discharge Sampling

The Keepa Road Pump Station discharge sampling was undertaken be myself.

Following heavy rain on 30 July 2008 and the early hours of 31 July 2008 the Keepa Road pump was started shortly before 9am on 31 July 2008. The discharge from the pump station to the Whakatane River was sampled at ten past nine. The sample was collected directly into the sample bottles using a sampling pole to hold the bottle in the flow of the discharge from the structure.

At the time of sampling the staff gauge on the Kopeopeo Canal (inlet) side was reading 0.98m.

This is 0.68m above the lowest level the pump can operate at. A few minutes after taking the sample the pump tripped out due to an electrical fault. At this time the staff gauge on the Whakatane (outlet/discharge) side was reading 1.14m. After the pump turned off it was noticeable that the water freshly discharged from the Kopeopeo was clearer than the water it was mixing with in the Whakatane River. At the time of sampling, the level in the Whakatane River at the Valley Road Gauging station was around 4.8m, approximately 1.5m above the first flood warning level.

The sample bottles were booked into the Environment Bay of Plenty laboratory for suspended solids and dioxin analysis (lab number 084389). The dioxin sample bottle was forwarded to AsureQuality laboratory.

The discharge sample returned a dioxin result of 0.00432 I-TEQ ng/l (including full detection level for non-detects) or 0.00528 WHO-TEQ ng/l (including full detection level for non-detects). The complete analytical results report is attached. The suspended solids level of the discharge sample was 40 g/m³.

Only limited comparative data is available for dioxin concentrations in water. The MfE national river water survey of 16 sites failed to detect any dioxin, with overall detection limits varying between 0.00102 to 0.0048 I-TEQ pg/l. A previous sample of the discharge from the old sawmill site just prior to redevelopment starting returned a result of 0.094 I-TEQ ng/l (Octa/hepta screen only), while three samples taken during the initial redevelopment (establishment of the Bunnings

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site) returned values of 0.01, 0.00477 and 0.00216 I-TEQ ng/l (Octa/hepta screen only) respectively with time. Water samples taken at three different points on the Kopeopeo Canal in November 2007 returned dioxin values of 0.000912 (SL1), 0.00121 (SL2) and 0.000884 (SL3) I- TEQ ng/l (Octa/hepta screen only).

Recent samples taken by Environment Bay of Plenty in the Waipa Stream in Rotorua returned results of 0.00673 and 0.00943 I-TEQ ng/l for upstream of the Waipa mill and 0.00898 and 0.0172 I-TEQ ng/l downstream of the Waipa mill.

The pump station discharge only reported detections for the Octa/hepta cogeners. The table below shows the I-TEQ calculated for the detected cogeners alone (minimum I-TEQ) for the November 2007 Kopeopeo samples and the current pump station discharge.

Sample Location Minimum I-TEQ ng/l dioxin

SL1 0.000256

SL2 0.000481

SL3 0.000551

Keepa Road Pump Discharge 0.000462

The flood conditions under which the Keepa Road Pump Station operates does not appear to be causing elevated dioxin levels beyond those normally experienced in the Kopeopeo Canal and compares favourably with the Waipa Stream catchment above the influence of the Waipa mill.

The Keepa Road pump is rated at 6 cubic metres per second and only operates under flood conditions. Where as the Orini Flood gate discharges during the tide cycle every day, except during major flood events, with a typical flow of around 20 cubic metres per second. Even if the dioxin in the sample taken from the pump discharge was entirely derived from Kopeopeo Canal sediments and the pump ran continuously, it would take several months before having a significant impact on the dioxin in the Kopeopeo. In reality the pump rarely operates at all.

Conclusion

The Keepa Road Pump Station is not acting as a significant mechanism for movement of dioxin contaminated sediment from the Kopeopeo Canal into the Whakatane River and adjacent land.

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