appendix q fiona harte regional earthworks report... · 2018. 6. 24. · environmental effects of...

APPENDIX Q

FIONA HARTE

REGIONAL EARTHWORKS REPORT

Consent: LUC60318373 (BUN60318372) America’s Cup 1

Technical Memo – Specialist Unit

To: Nicola Broadbent – Team Leader, North West Resource Consenting Unit, Auckland

Council

From: Fiona Harte – Specialist (Earth and Stream Works), Specialist Unit, Auckland Council

Date: 13 June 2018

1.0 APPLICATION DESCRIPTION

Application and property details

Applicant's Name: Panuku Development Auckland

Application numbers: LUC60318373 (BUN60318372)

Activity types: Earthworks

Purpose description: Earthworks to facilitate the construction of infrastructure

associated with the America’s Cup 36.

Site addresses:

11-99 Brigham Street, Brigham Street (legal road), Hamer Street(legal road), Jellicoe Street (legal road), 1 Brigham Street, 9Brigham Street, 8-34 Brigham Street / 8 Hamer Street, 36-54Brigham Street, 51E Brigham Street, 58 Brigham Street, 90Brigham Street, 49-63 Jellicoe Street, 65-75 Jellicoe Street / 2-8,12 Hamer Street, 37-55 Madden Street, North Wharf Section 5,Section 3 and Section 1, 141-177 Halsey Street, 155-161 HalseyStreet, Te Wero Island, 220 Quay Street, 149-159 & 161-173Quay Street, 149 Quay Street.

2.0 PROPOSAL, SITE AND LOCALITY DESCRIPTION

2.1 Proposal relevant to this consent only

2.2 This report provides an earthworks review / assessment of the America’s Cup resource

consent application, which I refer to in this memo as the “AC36 Application” or simply the

“application”. It is noted that the specific contaminated land aspects of the proposal that

are closely related to the earthworks are addressed in separate reports from Rob van de

Munckhof and Marija Jukic for the Council.


2.3 The applicant is seeking resource consent for earthworks in relation to the construction of

infrastructure associated with the America’s Cup 36 event. A full description of the proposal

is provided in the Assessment of Environmental Effects (AEE) for the application prepared by

UNIO Environmental Limited (UNIO) and dated 13 April 2018.

2.4 The following application documents are particularly relevant to this report and the

earthworks consent required:

(a) Reports:

- ‘America’s Cup Wynyard Hobson Application for Resource Consent: Assessment of

Environmental Effects’, prepared by UNIO and dated 13 April 2018 (AEE)

(Application Document 4);

- The applicant’s Proposed Conditions of Consent (Application Document 7);

- ‘America’s Cup Physical Infrastructure Technical Report for Resource Consent

Application, Wynyard Hobson’, prepared by Beca Ltd and dated 11 April 2018 (the

Infrastructure Report, Application Document 9);

- ‘Outline Erosion and Sediment Control Plan’, prepared by Beca Ltd and dated 11

April 2018 (Appendix C to the Infrastructure Report);

- ‘America’s Cup Preliminary Site Investigation (Contamination) for Resource Consent

Application, Wynyard Hobson’, prepared by Beca Ltd and dated 11 April 2018 (the

PSI Report, Application Document 27);

- A draft ‘Remediation Action Plan’, prepared by Beca Ltd and dated April 2018 (Appendix

F to the PSI Report).

(b) Plans:

- ‘America’s Cup, Engineering Concept Drawings for Resource Consent Application, Wynyard Hobson’, Application Documents DS5.1, DS5.2 and DS5.3, drawing package prepared by Beca Ltd and dated April 2018.

2.2 In brief:

(a) Earthworks are required over approximately 25,400m2.1

(b) Earthworks will involve excavations for ground improvements and construction of new

services, piling, creation of building platforms and re-paving.

2.5 Site Description

2.6 The applicant provides a description of the site in section 8 of the AEE. The proposed earthworks

are to be undertaken in Wynyard Quarter, Auckland City Centre. The area is flat and almost

completely impervious apart from areas which have been recently upgraded to create public

1 Area of earthworks as provided in the Outline Erosion and Sediment Control Plan.


space and infrastructure upgrades such as rain gardens. The area is well known for soil

contamination due to historical land use and reclamation of the costal marine area. The

immediate receiving environment is the adjacent coastal marine area (CMA) and the existing

stormwater network. The stormwater network discharges directly into the CMA being the

Waitemata Harbour and ultimately the Hauraki Gulf.

3.0 REASON FOR CONSENT – EARTHWORKS

3.1 Regional land use consent for earthworks is required under the provisions of Chapter E.11

Land Disturbance – Regional, of the Auckland Unitary Plan (Operative in Part) (AUP). Activity

(A9) in Activity table E.11.4.1 provides that general earthworks in the City Centre Zone and

on roads, greater than 2,500m2 within the Sediment Control Protection Area2 are to be

assessed as a restricted discretionary activity. The AC36 Application requires earthworks

over an area of 25,400m2. As such, the application requires regional consent with the

proposed earthworks assessed as restricted discretionary activity.

4.0 TECHNICAL ASSESSMENT OF EFFECTS

Assessment of effects on the environment

4.1 The applicant identifies and assesses the effects of the proposed earthworks activities on the

environment that are likely to arise and any mitigating factors in section 10.17 of the AEE

(section entitled “Land Disturbance & Contamination Effects”). The potential adverse

environmental effects of the proposed earthworks activities are in relation to potential

sediment discharges.

Earthworks

4.2 In order to manage the effects related to the potential sediment discharges associated with

the earthworks, the applicant has provided an Infrastructure Report including an “Outline

Erosion and Sediment Control Plan” (Outline ESCP) at Appendix C, and a draft “Remediation

Action Plan” (draft RAP) as Appendix F to the PSI Report. The applicant’s reports propose a

variety of controls to be established across the site to minimise the potential for erosion to

occur and for sediment to be discharged during the earthworks operation. The applicant has

also proposed to undertake the earthworks in accordance with Auckland Council’s Erosion

and Sediment Control Guide for Land Disturbing Activities in the Auckland Region, June 2016,

Guideline Document 2016/005 (GD05).

4.3 The Outline ESCP in conjunction with the draft RAP provides an overview of the erosion and

sediment controls to be used during the proposed earthworks. The applicant has not

provided a set of detailed erosion and sediment control drawings to complement the plans

and has advised that detailed drawings in the form of final site specific Erosion and Sediment

Control Plans, showing the location and specifications of controls for the respective

earthworks areas, will be submitted by the nominated earthworks contractor following issue

of consents and prior to earthworks commencing. Due to the contaminated nature of soils

2 With reference to Note 1 below E11.4.1 Activity table in the AUP, the site is located in a Sediment Control Protection

Area being within 100m landward of the coastal marine area.


within the proposed earthworks area, standard control of potentially sediment laden water

prior to its discharge will not suffice when dealing with contaminants such as hydrocarbons.

The applicant has proposed where possible to allow dirty water to infiltrate back into the

excavation area or be pumped to a dedicated sump within the site where it will be managed

as discussed below. Where this cannot be achieved, dewatering to the sewer has been

outlined as a possibility in the Outline ESCP and the draft RAP. Retention devices (i.e., a

dedicated sump, treatment tank or similar) and flocculation of these devices has also been

proposed as a possibility to reduce total suspended solids (TSS) to meet the relevant water

quality standards to discharge to the sewer network. The applicant has proposed that

specific details of the chosen dewatering and treatment methodology be included in the

contractor’s site specific Erosion and Sediment Control Plans. As these details (including

copies of any relevant trade waste permits) are required prior to earthworks commencing, a

requirement for final details regarding dewatering and water treatment has been included

below. This is to ensure the final methodology is appropriate and consistent with the options

noted in the Outline ESCP and draft RAP. If trade waste permits cannot be obtained to

discharge to the sewer, intensive onsite treatment of runoff generated during excavations

will need to be undertaken and it is expected that details of this treatment would be

included in the site specific erosion and sediment control plans.

4.4 It is recommended that a final set of erosion and sediment control plans (including site

drawings) be provided to Council for approval prior to earthworks commencing. This is to

ensure that the plans detail the specifications and location of controls to be used and will

also ensure that the plan has been drafted in conjunction with the final Remediation Action

Plan for contaminated soil to avoid discrepancies. Further recommendations within this

assessment can also be incorporated into the finalised plans for completeness.

4.5 In the Outline ESCP, stabilised construction entrances are proposed to ensure the entrances

to the site at Hamer Street and Brigham Street, reducing the risk of construction vehicles

tracking sediment out onto the public roads. The applicant identifies that wheel washes may

be used at the stabilised construction entrances to further prevent tracking onto the public

roads. The wheel washes are proposed to be drained or pumped to an approved sediment

retention device or dewatering device and the applicant has proposed that details in this

regard will be included in the contractor’s site specific Erosion and Sediment Control Plans

prior to earthworks commencing. Based on the nature and type of earthworks proposed, I

consider this to be an acceptable method to minimise the potential sediment related effects

of the earthworks.

4.6 Controlling the amount of clean water entering the site with clean water diversion bunds has

also been proposed. This will ensure surface water is directed around the respective

earthworks areas to prevent clean water from entering the area and contributing to the

amount of water that needs to be treated on the site. The applicant has envisaged that the

existing road kerb and gutter will act as clean water diversion for many of the required

earthworks areas and that specific concrete/asphalt bunds will be required in some

locations. Concrete and asphalt bunds are also proposed where conveyance of dirty water is

proposed to ensure dirty water does not flow offsite and can be directed to the excavations


or dewatered to an approved treatment device.

4.7 The applicant has proposed to protect adjacent stormwater cesspits with geotextile filter

cloth and silt socks. Generally speaking, contaminants bind to soil and the filtration provided

by the cesspit protection may aid in reducing some contaminants from being discharged into

the stormwater system, however, it is highlighted that this is a contingency measure only

and that the focus should be on avoidance of sediment discharges, in particular to the

reticulated system. In some scenarios, capping of the existing stormwater infrastructure may

be more appropriate, especially where existing cesspits are located within the areas

proposed to be excavated. It is recommended that any cesspits proposed to be protected or

blocked off during the works be detailed in the finalised set of erosion and sediment control

plans.

4.8 The need for stockpiling of soil has been identified within the Outline ESCP. Stockpiles are

proposed to be covered with polythene and bunded to prevent ingress of rain water which

could lead to erosion. The applicant has acknowledged that any proposed stockpile areas will

be detailed in the contractor’s site specific Erosion and Sediment Control Plan and will align

with the procedures to be detailed in the final Remediation Action Plan. The draft RAP also

notes that stockpiles are to be minimised and kept to a height no greater than 3m and shall

not be placed in an area where runoff cannot be controlled. I concur with the applicant’s

proposed measures in this regard.

4.9 A seasonal restriction has not been recommended for the proposed earthworks due to the

nature and type of earthworks to be undertaken. The sites are flat and although some of the

proposed earthworks areas border the CMA, the earthworks to be undertaken are generally

below ground excavations where dirty water has limited potential to flow directly to the

CMA. Water can be contained within excavations where necessary and soak back into the

ground or be pumped to a containment and treatment device before being discharged.

4.10 Progressive stabilisation is proposed to limit the exposed area of earthworks at any one

time, however no detail has been provided in this regard. The applicant has stated that they

will endeavour to complete the earthworks during the Auckland Council earthworks season

(1st April – 30th April) however have also stated that works may occur outside of these

months, during winter. Although a seasonal restriction has not been recommended (as

above), it is recommended that details of staging and open areas be included in the

Construction Environmental Management Plan for Council approval, prior to works

commencing.

4.11 There are some works proposed at the interface between land and CMA. This includes

ground improvement and shoreline remediation. The applicant has envisioned that the use

of a coffer dam or temporary seawall will be used to retain any sediment laden runoff from

land within a dry area. I concur with this approach and note that a coffer dam was

successfully used to create a dry working area and avoid sediment discharges while

constructing a stormwater outfall into the CMA off Halsey Street during the Halsey and Daldy

Street upgrade and infrastructure works. It is recommended that final details and

specifications of the cofferdam/ temporary seawall be provided for Council approval prior to


works commencing.

Conclusion

4.12 Although detailed erosion and sediment control drawings have not been provided with the

application, the detail within the Outline ESCP and draft RAP is deemed sufficient to

demonstrate that the applicant can appropriately manage the effects relating to potential

sediment discharges resulting from the proposed earthworks.

4.13 For the proposed earthworks, provided the erosion and sediment controls are installed,

constructed and maintained in accordance with the AEE, supporting documentation, the

recommendations above and any additional requirements as deemed necessary by the

guidance outlined in GD05, I consider the resulting effects on the environment from

sediment discharges during the earthworks will be appropriately managed.

4.14 I accept the applicant’s proposed consent conditions in Application Document 7 relating to

erosion and sediment control including the incorporation of finalised site-specific Erosion

and Sediment Control Plans to be provided within an overarching Construction

Environmental Management Plan. However, I have suggested some minor amendments to

the applicant’s proposed wording. These have been incorporated into my recommendations

in section 6 below.

4.15 Affected parties

4.16 Due to the nature of the effects considered in this memo, and for the reasons set out above,

it is considered that no persons are adversely affected by the proposed earthworks activities.

5.0 STATUTORY CONSIDERATIONS

Objectives and Policies of the AUP

5.1 The relevant regional land disturbance objectives and policies are found in sections E11.2

and E11.3 of the AUP (Objectives 1-3 and Policies 1-8). These objectives and policies seek to

ensure that earthworks are undertaken in a manner that protects people and the

environment, does not exacerbate natural hazards and minimises sediment generation.

Other Statutory documents

5.2 The following statutory documents are considered relevant to the planner’s assessment of

the application:

AUP Regional Policy Statement (AUP RPS)

a. Chapter B7, Natural Resources of the AUP RPS is considered relevant as the objectives

and policies in section B7.4 seek to ensure the progressive improvement of degraded

coastal water, the quality of good or excellent coastal water is maintained and that

any adverse effects are avoided, remedied or mitigated.


New Zealand Coastal Policy Statement 2010 (NZCPS)

b. As the ultimate receiving environment of the proposed activity is the CMA and the

Hauraki Gulf, the NZCPS is considered relevant to this application. The NZCPS seeks to

protect the coastal environment and its special values and states that adverse effects

of development should, as far as practicable, be avoided. As potential discharges from

the development will ultimately reach the CMA, this statutory document is considered

relevant.

Hauraki Gulf Marine Park Act (HGMPA) 2000

c. As the ultimate receiving environment includes the Hauraki Gulf, the HGMPA is

considered relevant to this application. The HGMPA seeks to recognise the national

significance and life-supporting capacity of the Hauraki Gulf along with enhancing its

natural, historic and physical resources where appropriate.

The assessment of objectives and policies is a matter for the Council’s reporting planner,

however I have read the provisions referred to above, and from a technical perspective,

subject to implementation of the recommended conditions of consent, I consider the

proposal to be consistent with them.

6.0 RECOMMENDATION AND CONDITIONS

Adequacy of information

6.1 The above assessment is based on the information submitted as part of the AC36

Application. It is considered that the information submitted is sufficient to enable the

consideration of the above matters on an informed basis:

a. The level of information provides a reasonable understanding of the nature and scope

of the proposed activities as they relate to the relevant planning documents.

b. The extent and scale of any potential adverse effects on the environment are able to

be understood and assessed, however detail around the final works approach is

incomplete and further recommendations have been made to bridge the information

gaps.

Recommendation

6.2 The assessment in this memo does not identify any reasons to withhold consent, and the

aspects of the proposal considered by this memo relating to earthworks could be granted

consent, subject to recommended conditions, for the following reasons:

a. The sensitivity of the receiving environment to the potential adverse effects of

sediment discharge will not be compromised given the expected level of discharge,

suitable control technologies and appropriate on-site management techniques.


b. Subject to the imposition of suitable consent conditions, it is considered that the

potential effects on the receiving environment will be appropriately managed.

Conditions

6.3 The applicant has provided a set of proposed conditions that are consistent with Council’s

standard earthworks conditions and have subsequently been incorporated into my

recommended conditions below. However, some minor wording changes have been made

to ensure the conditions are clear and enforceable and also to incorporate the addition of

extra detail for the site-specific Erosion and Sediment Control Plan requirements. It is also

considered appropriate to recommend consent conditions regarding progressive

stabilisation during the works and permanent stabilisation of the site on completion or

abandonment of works. The inclusion of these conditions is consistent with similar

earthworks operations for which consent has been granted in the Auckland Region, and the

wider site, and will ensure that the effects of the proposed earthworks will be appropriately

managed.

General conditions

6.4 I recommenced that a number of general conditions are imposed covering:

• Access to the site (I note that proposed condition 9 addresses this); and

• Works undertaken in accordance with the plans (I note that proposed condition 13

requires the construction of physical infrastructure to be undertaken “in general

accordance with the drawings provided in Document DS5”. I suggest that this be

amended to read “in accordance with”. I understand that the Council’s planner,

Nicola Broadbent, is recommending a number of other improvements to this

condition).

6.5 The following conditions or amendments to conditions are recommended:

Pre-commencement meeting

6.5 I recommend the following minor amendments to proposed condition 40:

Within 15 working days prior to Commencement of Construction, the Consent Holder shall arrange and conduct a pre-start meeting that:

a) Is located on the subject site;

b) Is scheduled not less than five days before the anticipated Commencement of Construction;

c) Includes Council Compliance Monitoring representatives;

d) Includes representation from the contractors who will undertake the works; and

e) Includes an invitation to Mana Whenua.


6.6 A minor amendment to the advice note following condition 44 is proposed as follows:

Advice Note: To arrange the pre-start meeting please contact the Team Leader –

Central Monitoring Compliance Monitoring - Central to arrange this meeting on

[email protected], or 09 301 01 01. The conditions of consent

should be discussed at this meeting. All additional information required by the

Council should be provided no later than 2 days prior to the meeting.

Construction Environmental Management Plan

6.7 I recommend that condition 32(b) be amended as follows:

b) Construction works programming, including:

(i) an outline construction programme;

(ii) confirmation of the proposed staging and sequence of construction;

(iii) the open area of earthworks throughout construction;

(iv) the indicative timing of the submission of Site Specific Erosion and Sediment Control Plans to be submitted to Council for approval for each stage.

Erosion and Sediment Control

6.8 The applicant’s proposed erosion and sediment control conditions are split between

conditions 70 to 74 (controls generally) and conditions 75 to 84 (relating to erosion and

sediment control plans). There is some repetition and overlap. In my amended set of

conditions below, I have endeavoured to minimise repetition. Specifically:

a. The applicant’s proposed condition 70 is very similar to condition 83. I have

merged the two conditions as a new condition 77.

b. Similarly, condition 71 is very similar to condition 82, and I again

recommend merging the two conditions as a new condition 76.

c. I have relocated conditions 72 and 73 relating to inspection / maintenance

and progressive stabilisation to conditions 78 and 79 respectively.

d. I have relocated condition 74 (concerning notification of completion of

earthworks).

6.9 The proposed set of re-organised and amended conditions is set out below:

Erosion and Sediment Control

70. During construction, the Consent Holder shall take all practicable

measures to minimise erosion and prevent the discharge of sediment

beyond the boundaries of the site of earthworks on land. This includes

mailto:[email protected]


deposition of mud or other debris on any road or footpath beyond the

boundary of the site resulting from earthworks activity on the subject site.

In the event that such deposition does occur, it shall immediately be

removed.

71. Erosion and sediment control measures shall be implemented throughout

land-based Construction Works. They shall be constructed and maintained

so as to operate and perform in accordance with Auckland Council

GD2016/005: Erosion Sediment Control Guide for Land Disturbing

Activities in the Auckland Region and any amendments to this document,

except where a higher standard is detailed in the conditions below in

which case the higher standard shall apply.

Advice note: Standard E26.7.5.1 of the Auckland Unitary Plan (Operative in Part)

outlines the Accidental Discovery Rule in relation to Land Disturbance for

infrastructure. Except as authorised by this consent and provided for in Condition 45,

this standard must be complied with at all times, and should these requirements be

unable to be complied with, a further resource consent may be required.

7570. At least 10 working days pPrior to Commencement of Construction for each

stage of the Project, an Site-Specific Erosion and Sediment Control Plan

(SSESCP), shall be prepared by a suitably qualified person in general

accordance with Auckland Council Guideline GD05, Erosion and Sediment

Control Guide for Land Disturbing Activities in the Auckland Region. The

SSESCP shall be submitted to the Team Leader Compliance Monitoring -

Central for certification in terms of the matters in Condition 72. No

earthworks activity on the subject site shall commence until written

approval for the relevant SSESCP is received from the Team Leader

Compliance Monitoring - Central.

7671. The purpose of the SSESCP is to set out the measures to be implemented

during construction to minimise erosion and the discharge of sediment

beyond the boundaries of the site.

7772. The SSESCPs shall include, but not be limited to, the following information

as appropriate to the scale, location and type of earthworks:

a) Drawings showing location and quantities of earthworks and any mudcrete placement on land, contour information, catchment boundaries and erosion and sediment controls (location, dimensions, capacity);

b) Supporting calculations for erosion and sediment controls;

c) Catchment boundaries and contour information;

d) Reference to details of measures for contaminated land;

e) Details of construction methods to be employed, including timing and duration;


f) Dewatering and pumping methodology (if applicable);

g) Details of the proposed water treatment measures, devices and appropriate trade waste permits (if applicable);

h) Specific location of stockpile areas (if applicable);

i) Detail of adjacent cesspits to be protected or capped (if applicable);

j) Final details and specifications of the coffer dam or temporary seawall;

k) A programme for managing exposed areas, including progressive stabilisation considerations;

l) Roles and responsibilities under the SSESCP and identification of those holding roles including the suitably qualified person; and

m) Monitoring, maintenance and record-keeping requirements.

7873. Prior to any earthworks commencing, a certificate signed by an

appropriately qualified and experienced person shall be submitted to the

Team Leader Compliance Monitoring - Central, to certify that the erosion

and sediment controls have been constructed in accordance with the

approved SSESCPs erosion and sediment control plans and Auckland

Council Guideline GD05.

7974. Certified controls shall include but not be limited to the dewatering and

treatment devices, stabilised construction entrances, cesspit protection and

clean and dirty water diversions. The certification for these and any

subsequent measures shall be supplied immediately upon completion of

construction of those measures. Information supplied if applicable, shall

include:

ma) Contributing catchment area;

b) Treatment capabilities and capacities;

nc) Shape and capacity of structure (dimensions of structure);

od) Position of inlets/outlets;

pe) Stabilisation of the structure; and

qf) A statement regarding the appropriateness of the device with respect to Auckland Council Guideline GD05.

80. At least 10 working days prior to commencement of construction

associated with each stage of the Project, the consent holder shall submit

the ESCP to the Team Leader – Central Monitoring for certification in terms

of the matters in Condition 77. No earthworks activity on the subject site

shall commence until written certification for the relevant ESCP is received

from the Team Leader – Central Monitoring.

8175. The operational effectiveness and efficiency of all erosion and sediment

control measures required by the ESCP SSESCPs shall be maintained

throughout the duration of earthworks activity, or until the site is


permanently stabilised against erosion.

8276. Erosion and sediment control measures shall be constructed and

maintained in general accordance with Auckland Council Guideline GD05

GD2016/005: Erosion Sediment Control Guide for Land Disturbing Activities

in the Auckland Region and any amendments to this document, except

where a higher standard is detailed in the conditions of this consent or in

the SSESCP documents referred to the ESCP, in which case the higher

standard shall apply.

8377. Earthworks shall be managed to avoid There shall be no deposition of

earth, mud, dirt or other debris on any road or footpath beyond the subject

site resulting from earthworks activity on the subject site. In the event that

any deposition does occur, it shall immediately be removed. In no instance

shall roads or footpaths be washed down with water without appropriate

erosion and sediment control measures in place to prevent contamination

of the stormwater drainage system, watercourses or receiving waters.

Advice Note: In order to prevent sediment laden water entering waterways from the

road, the following methods may be adopted to prevent or address discharges should

they occur:

• Provision of a stabilised entry and exit(s) point for vehicles;

• Provision of wheel wash facilities;

• Ceasing of vehicle movement until materials are removed;

• Cleaning of road surfaces using street-sweepers;

• Silt and sediment traps; and

• Catchpit protection.

In no circumstances should the washing of deposited materials into drains be advised

or otherwise condoned.

It is recommended that the consent holder discusses any potential measures with the

Council’s monitoring officer who may be able to provide further guidance on the most

appropriate approach to take. Please contact the Team Leader – Central Monitoring

Compliance Monitoring - Central for more details. Alternatively, please refer to

Auckland Council Guideline GD05, Erosion and Sediment Control Guide for Land

Disturbing Activities in the Auckland Region.

7278. The sediment and erosion controls at the site of the works shall be

constructed and maintained in accordance with the approved SSESCP and

shall be inspected on a regular basis and within 24 hours of each rainstorm


event that is likely to impair the function or performance of the controls. A

record shall be kept of the date, time and any maintenance undertaken in

association with this condition, and shall be forwarded to the Team Leader

– Central Monitoring Compliance Monitoring - Central on request.

7379. The site shall be progressively stabilised against erosion at all stages of the

earthwork activity and shall be sequenced to minimise the discharge of

sediment to surface water. The site shall be stabilised against erosion as

soon as practicable, and in a progressive manner, as earthworks are

finished over the sites. Areas of earthworks not actively worked for a period

of two weeks shall be stabilised until such time as further earthworks occur

in a specific area.

Advice Note: Earthworks shall be progressively stabilised against erosion during all

stages of the earthwork activity. Interim stabilisation measures may include:

• The use of waterproof covers, geotextiles, or mulching;

• Top-soiling and grassing of otherwise bare areas of earth; and

• Aggregate or vegetative cover that has obtained a density of more than 80% of

a normal pasture sward.

It is recommended that the consent holder discusses any potential measures with the

Council’s monitoring officer who may be able to provide further guidance on the most

appropriate approach to take. Please contact the Team Leader – Central Monitoring

Compliance Monitoring - Central for more details. Alternatively, please refer to

Auckland Council Guideline GD05, Erosion and Sediment Control Guide for Land

Disturbing Activities in the Auckland Region.

80. Upon completion or abandonment of earthworks on the subject site all

areas of bare earth shall be permanently stabilised against erosion to the

satisfaction of the Team Leader Compliance Monitoring - Central.

Advice Note: Should the earthworks be completed or abandoned, bare areas of earth

shall be permanently stabilised against erosion. Measures may include:

• The use of mulching;

• Top-soiling, grassing and mulching of otherwise bare areas of earth;

• Aggregate or vegetative cover that has obtained a density of more than 80%

of a normal pasture sward; and

The on-going monitoring of these measures is the responsibility of the consent

holder. It is recommended that the consent holder discusses any potential measures

with the Council’s monitoring officer who will guide you on the most appropriate


approach to take. Please contact the Team Leader – Central Monitoring Compliance

Monitoring - Central for more details. Alternatively, please refer to Auckland Council

Guideline GD05, Erosion and Sediment Control Guide for Land Disturbing Activities in

the Auckland Region.

84. The Consent Holder shall carry out monitoring in accordance with the ESCP

and shall keep records detailing:

a) The monitoring undertaken;

b) The erosion and sediment controls that required maintenance;

c) The time when the maintenance was completed; and

d) Areas of non-compliance with the erosion and sediment control

monitoring plan (if any) and the reasons for the non-compliance.

This information shall be made available to the Team Leader – Central

Monitoring upon request.

7482. Written nNotification shall be given to the Team Leader – Central

Monitoring Compliance Monitoring - Central within 20 working days of

completion of earthworks.


7.0 REVIEW

Memo prepared by:

Fiona Harte

Specialist - Earth and Stream works

Specialist Unit, Resource Consents

Date: 13 June 2018

Matt Byrne

Earthworks, Streamworks & Sediment Management Consultant


Date: 13 June 2018

Technical memo reviewed and approved for release by:

David Hampson

Team Leader – Earth, Streams and Trees


Date: 13 June 2018