Neighbours’ Meeting29th September 2015

David Hopman – Manager Assets and Operations

Kevin Godfrey – Treatment Plant Supervisor

Communicate the findings of the Annual Report on plant performance

Overview of construction issues associated with the old ponds Pond sludge removal Additional irrigation options To provide an update on progress with the project and the

timeline for the coming year To provide neighbours with an opportunity to raise any issues

they may have and for appropriate people from within the project team to answer questions

New pond construction complete. New border strips planted shortly with any

settlement to be corrected when earthen borders are constructed.

50,000m³ sludge dewatered, desludged and landfilled versus an estimate of 36,600m³.

Up to 15,000m³ sludge remains in Ponds 2, 3 & 3A.

Exploring alternative options for sludge management.

Determine options for additional land disposal.

For the 2014/15 monitoring period, the following was noted:

The discharged flows complied with the consent requirements on all occasions.

The quality of the discharge complied with the consent conditions.

Telemetry for providing treatment plant flow data to the Regional Council’s Data Management System was not commissioned for a month after the consent date because of time taken to clarify GWRC time and date format system requirements.

The effects of discharges of treated wastewater on aquatic life in the Ruamahanga River are expected to reduce once the full land disposal system is commissioned with discharges only at higher river flows.

Direct Discharge Stopped

Direct Discharge Stopped

Direct Discharge Stopped

Direct Discharge Stopped

New Discharge Commissioned

New Discharge Commissioned

New Discharge Commissioned

Irrigation Started

Irrigation Started

Note: graphs exclude readings for sites HB11 and BP34/0047 as their readings were below detection limits.

Irrigation Started

Irrigation StartedNote: graphs exclude readings for sites HB11, BP34/0047 and BP34/0049 as their readings are below detection limits.

Irrigation Started

Note: the graph excludes readings for sites HB16, HB21, HB13, BP34/0047, BP34/0048 and BP34/0049 as their readings are below the detection limits.

Soil Monitoring – Total NitrogenSoil Monitoring – Total Nitrogen

Ruamahanga River Ruamahanga River Environmental Monitor DataEnvironmental Monitor Data

QMCI   Decreases

Date RU1RU2/RU1

RD2  RU2/

RD1RD2

*4/03/2013

4.15 3.8 2.07 

0.35 2.08

24/11/2013

5.82 3.11 3.78 

2.71 2.04

12/03/2014

5.49 4.03 2.99 

1.46 2.5

5/01/2015

6.21 3.47 3.72 

2.74 2.49

3/03/2015

5.66 3.91 3.87 

1.75 1.79

        Average Decrease

2.2 2.2

* sample taken before diffuser commissioned

Land Discharge RequirementsLand Discharge RequirementsBorder Strip Maximum Application DepthBorder Strip Maximum Application Depth

Parameter Value

Irrigation Volume (m3) 491,560m³

Irrigation Area (ha) 56.4

Average Irrigation Depth (mm) 872

Maximum Depth Recorded (mm) Border Strip J9-4 on 29/03/15

79

Average Daily Summer Average Daily Summer Application RatesApplication Rates

Parameter ValueIrrigation Volume (m3) 491,560m³

Irrigation Area (ha) 56.4

Irrigation Period (days) 181

Rainfall Over Period (mm) 402

Average Irrigation Depth Per (mm) 4.8

Average Rainfall Per Day (mm) 2.2

Average Daily Application Rate Including Rainfall (mm) 7.0

Border Strip Operation - IrrigationBorder Strip Operation - Irrigation

L-Zone Border Strips

Options being discussed with stakeholdersSludge is relatively inert and environmental impacts are likely to be minimalIt is well stabilised and contains less nutrients than expected.Stakeholder support to manage the sludge onsite as a more cost effective option.Options are to;•use on border strips•use on planted beds•leave where it is

Sludge RemovalSludge Removal

15 hectares of additional irrigation capacity required to make up for abandoned M-Zone border strips

Options being explored:• constructed wetland in area of old ponds• filtration/UV disinfection – a trial has been completed• additional irrigation on Homebush dairy farm• irrigation of adjacent farms Discussions with Iwi have been held to “rule-in-options” Once Iwi have considered the implications of these

options, further work will be done.

Additional Irrigation OptionsAdditional Irrigation Options

All queries or concerns should be directed to MDC.

Calls/contact are logged and directed to David Hopman.

David discusses/actions with the appropriate parties.

Action is taken as appropriate, the call closed off and contact made with the person who contacted MDC.

Questions?