Whanganui City-Wide Growth Wastewater Bulk Supply Investigation (Revisited)

Whanganui District Council Whanganui City-Wide Growth Wastewater Bulk Supply Investigation (Revisited)

March 2016 Executive summary

This report is subject to, and must be read in conjunction with, the limitations set out in Section 1.4 and the assumptions and qualifications contained throughout the Report.

Wanganui District Council (WDC) has estimated the potential growth up to the year 2065. The growth includes city-wide infill as well as new greenfield development in Springvale and Otamatea. GHD was engaged to assess the impacts of this population growth on the existing wastewater network. From there a programme of works and preliminary cost estimate was developed that estimated the costs for network upgrades in each area. These costs could then be used in assisting WDC in quantifying the contribution required by developers in order for the network to accommodate growth in those areas. Prior to this work, GHD was engaged to develop a programme of works to meet the 1 in 1 year target level of service (LOS). Four alternatives for upgrades were considered in this study:

a. M12 gravity upgrades

b. M12 low pressure sewer (LPS)

c. M12 gravity upgrades plus Beach Road Pump Station (BRPS) modifications

d. M12 LPS plus BRPS modifications Based on the cost estimates presented in that study, WDC selected alternatives a) and b) to be used for assessing the impact of growth. Therefore two sets of options were developed for each growth scenario: 1 in 1 year system improvements with M12 gravity upgrades and 1 in 1 year system improvements with M12 LPS.

In order to determine the costs for each growth area, the following scenarios were analysed for each system improvements option:

1. Springvale greenfield development with gravity wastewater scheme 2. Springvale greenfield development with LPS wastewater scheme

3. Otamatea greenfield development with gravity wastewater scheme

4. Otamatea greenfield development with LPS wastewater scheme

5. Catchment-wide infill Evaluation of the ten growth scenarios revealed the following:

• The M12 option selected had minimal impact on the growth scenarios.

• The Otamatea gravity greenfield development was found to be the most expensive growth area, and there was marginal difference between the Springvale gravity versus LPS greenfield development options when considering additional costs to developers / customers. • Growth from infill only had a minor impact on the existing network. Following the results of the individual growth area assessments, a workshop was held with WDC during which the preferred growth scenarios were chosen. The scenarios selected were as follows:

• 1 in 1 year system improvements with M12 gravity upgrades (option a)

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I i • Springvale greenfield development with gravity network (scenario 1)

• Otamatea greenfield development with LPS (scenario 4)

• Catchment-wide infill (scenario 5)

These scenarios were combined to determine if any additional upgrades were required. Evaluation of the combined growth scenario revealed that, in addition to an increase in storage requirements, Otamatea was the only area that required additional upgrades.

Costs associated with upgrades required to accommodate growth were then allocated to the different growth areas based on their increase in peak flow. Table 1 below summarises the total costs for each growth area and the estimated cost per dwelling. It should be noted that the costs presented are real costs for upgrading the existing network—they do not include developer costs for alternative options such as duplicating mains in lieu of upgrading.

Table 1 Summary of Costs for Each Growth Area

Growth Area Number of Total Cost Cost per Dwelling Dwellings

Springvale Development 417 $202,847 $486

Otamatea Development 179 $248,559 $1,389

Infill

- Otamatea Id!! 455 $165,827 $364

Springvale Infill 731 $59,971 $82

Inner City Infill 334 $19,190 $57

Commercial Infill 197 $8,818 $45

- Other Residential Infill 255 $33,788 $133

TOTAL $739,000

The cost for upgrades due to combined growth accounts for approximately 5% of the System Improvement upgrades required to meet the target LOS. Although modelling results showed that the individual growth due to infill scenario required minimal pipe upgrades, the storage requirements were much greater than the storage required to accommodate growth from the greenfield developments. The results also showed that Otamatea required the most upgrades, regardless if infill, Otamatea greenfield development, or growth from both areas combined were considered.

It should be noted that the proposed upgrades are contingent on the findings from the M4 investigation as well as re-calibration of the P8 / Liverpool Pump Station catchment. For P8 it is recommended that the flows be re-monitored, the pump station controls be adjusted to reduce the number of pump starts, and the catchment re-calibrated. Similarly, for Central City it is recommended that the model be updated and re-calibrated following the investigation. The re- calibrated model can then be used to modify / confirm the upgrades identified in this report. Once the upgrades have been finalised, the cost per dwelling can be revised. The revised cost can then serve as a guide for WDC in determining the developer contributions.

ii I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Table of contents

1. Introduction 1 1.1 Background 1 1.2 Purpose of this report 1 1.3 Previous Modelling and Relevant Reports 1 1.4 Limitations 2

2. Preliminary Network Assessment 4 2.1 Base Model 4 2.2 Population Growth 6 2.3 Existing Network Capacity Investigation for Growth 11 2.4 Upgrade Strategy 13 2.5 System Upgrades for Growth Scenarios 13 2.6 Summary of Modelling Results 22

3. Combined Growth Network Assessment 24 3.1 Workshop Outcomes 24 3.2 Existing Network Capacity 24 3.3 System Upgrades for Combined Growth 24 3.4 Summary of Modelling Results 26

4. Costs 27 4.1 Individual Growth Scenarios 27 4.2 Combined Growth Scenarios 30

5. Prioritisation 35

6. Conclusions 37

7. Recommendations 38

Table index

Table 1 Summary of Costs for Each Growth Area ii

Table 2 Springvale LPS Sub-Catchments 9 Table 3 Summary of Predicted Spilling 12

Table 4 Preliminary Springvale Greenfield Development Remedial Works Cost Comparison 28 Table 5 Preliminary Otamatea Greenfield Development Remedial Works Cost Comparison 29 Table 6 Preliminary Infill Remedial Works Cost Comparison 30

Table 7 Comparison of Costs for Growth Scenarios in Each Spill Area 31

Table 8 Additional Flow Attributed to Growth 31

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I iii Table 9 Prorated Costs for Combined Growth in Each Growth Area 33 Table 10 Summary of Costs for each Growth Area 34

Figure index

Figure 1 Liverpool Pump Station Cross Connection and Overflow Plan 5

Figure 2 Optimised Liverpool Pump Station Control Philosophy 6

Figure 3 Whanganui City-Wide Growth Areas 8

Figure 4 Model Scenario Layout 10

Appendices

Appendix A — Revised System Improvements

Appendix B — E/One Reference Guide

Appendix C — Spill Areas for Growth Scenarios

Appendix D — Common Upgrades

Appendix E — Individual Growth Scenario Upgrades

Appendix F — Combined Growth Upgrades

Appendix G — Individual Scenario Cost Estimates

Appendix H — Combined Growth Cost Estimate

iv I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 1. Introduction 1.1 Background

As part of their strategic planning, Whanganui District Council (WDC) has estimated the potential growth over the next 50 years (up to 2065). The growth areas have been categorized into infill (growth within the existing infrastructure) and greenfield development (new developments and extension of the infrastructure). The impact on the existing wastewater network will determine if the network has sufficient capacity to cope with additional flows associated with growth. If constraints are found, a plan of cost effective upgrades must be identified. The costs associated with the network upgrades will also assist the Council in understanding the economic viability of the future growth in each of the areas identified.

1.2 Purpose of this report

The wastewater network was previously evaluated for several different growth scenarios, the findings of which can be found in the Wastewater Bulk Supply Investigation (January 2016) written by GHD. Since that report was written, the 1 in 1 year system improvements included in the model have been revised. GHD was engaged by WDC to re-evaluate the wastewater network's capacity for growth incorporating the revised 1 in 1 year system improvements from the Revised System Improvements Report (February 2016). This is a supplemental report to the January 2016 Wastewater Bulk Supply Investigation. The purpose of this report is to document the modelling and resultant options assessment carried out to assess the effects that the proposed growth will have on the wastewater network, and what upgrades are required to accommodate the estimated growth. From there WDC can use the estimated costs for each growth area to quantify the contribution required by developers in order for the network to accommodate growth in that area.

1.3 Previous Modelling and Relevant Reports

1.3.1 System Performance

In 2013-2014 GHD built and calibrated a wastewater model for the entire Whanganui wastewater system. This model has enabled the constraints in the existing system to be better understood and the possibility of augmenting the existing system to cope with the additional flows to be explored in more detail.

During system performance the model predicted significant spilling in Central City (M4 catchment) during relatively minor rain events. Manhole spilling in this area had not been observed in reality to the extent or frequency predicted by the model. This is further discussed in the following reports: • Whanganui District Council Wastewater Model — System Performance, October 2014

• Whanganui District Council Wastewater System — Infiltration and Inflow Assessment, March 2015 At the time of this report, investigations were underway to locate the source of this anomaly. No changes have been made in this catchment related to the investigation.

1.3.2 System Improvements

In July 2015, and again in February 2016, GHD completed a System Improvements Masterplan utilising the model. The masterplan identified projects required for WDC's wastewater network

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Ii to meet the 1 in 1 year level of service (LOS) containment targets for the existing demand on the system.

The base models used in this investigation incorporated the February 2016 system improvements. Multiple options were evaluated relating to the upgrade scheme in M12 (gravity versus LPS) and BRPS maximum discharge flow rate. Improvements and other information can be found in the following reports:

• Whanganui District Council Wastewater Masterplan — System Improvements, July 2015

• Whanganui District Council Wastewater Masterplan — Revised System Improvements, February 2016

The impact of growth was evaluated on both gravity upgrades in M12 and a new LPS in M12; no changes were made to the maximum discharge rate at Beach Road Pumping Station (BRPS).

1.3.3 Wastewater Bulk Supply Investigation

In January 2016, GHD was engaged by WDC to investigate the impact of growth on the network. The base model used in that investigation incorporated the 2015 system improvements, with some amendments. In that investigation, the M12 catchment included gravity upgrades only, and it was assumed that the anomalies in Central City had been addressed and the wet weather response was therefore reduced. Under this investigation no changes have been made to Central City, i.e. the system performs as per the original calibration and therefore has significant spilling in a 1 in 1 year flow event.

This project builds on the information gathered during the initial bulk supply investigation. Background information on the proposed growth areas, delineations, and how it was modelled can be found in the following report:

• Whanganui District Council City-Wide Growth — Wastewater Bulk Supply Investigation, January 2016

1.4 Limitations

This report: has been prepared by GHD for Whanganui District Council and may only be used and relied on by Whanganui District Council for the purpose agreed between GHD and the Whanganui District Council as set out in the proposal document.

GHD otherwise disclaims responsibility to any person other than Whanganui District Council arising in connection with this report. GHD also excludes implied warranties and conditions, to the extent legally permissible.

The services undertaken by GHD in connection with preparing this report were limited to those specifically detailed in the report and are subject to the scope limitations set out in the report.

The opinions, conclusions and any recommendations in this report are based on conditions encountered and information reviewed at the date of preparation of the report. GHD has no responsibility or obligation to update this report to account for events or changes occurring subsequent to the date that the report was prepared.

The opinions, conclusions and any recommendations in this report are based on assumptions made by GHD described in this report GHD disclaims liability arising from any of the assumptions being incorrect.

GHD has prepared this report on the basis of information provided by Whanganui District Council and others who provided information to GHD (including Government authorities), which GHD has not independently verified or checked beyond the agreed scope of work. GHD does not accept liability in connection with such unverified information, including errors and omissions in the report which were caused by errors or omissions in that information.

2 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 GHD has prepared the preliminary cost estimates set out in Appendix G and Appendix H of this report using information reasonably available to the GHD employee(s) who prepared this report; and based on assumptions and judgments made by GHD.

The Cost Estimate has been prepared for the purpose of provide an indicate cost of the upgrades infrastructure required and must not be used for any other purpose.

The Cost Estimate is a preliminary estimate only. Actual prices, costs and other variables may be different to those used to prepare the Cost Estimate and may change. Unless as otherwise specified in this report, no detailed quotation has been obtained for actions identified in this report. GHD does not represent, warrant or guarantee that the [works/project] can or will be undertaken at a cost which is the same or less than the Cost Estimate.

Where estimates of potential costs are provided with an indicated level of confidence, notwithstanding the conservatism of the level of confidence selected as the planning level, there remains a chance that the cost will be greater than the planning estimate, and any funding would not be adequate. The confidence level considered to be most appropriate for planning purposes will vary depending on the conservatism of the user and the nature of the project. The user should therefore select appropriate confidence levels to suit their particular risk profile.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 13 2. Preliminary Network Assessment

In order to develop an estimate for developer contributions, each growth scenario was first modelled separately.

2.1 Base Model

The base model selected to investigate the proposed urban development was the calibrated model with the revised 1 in 1 year system improvements. WDC chose to evaluate the network under two different improvements options:

1. Spilling in M12 addressed using gravity upgrades (i.e. upgrade of conveyance systems and attenuation through storage)

2. Spilling in M12 addressed by installing a new low pressure sewer (LPS)

Since the submittal of the Revised System Improvements Report, two areas were identified that require upgrades that should be included in the 1 in 1 year system improvement programme. Although they were identified during the bulk growth investigation, their upgrades should not be attributed to any of the growth scenarios. These two additional spill areas are discussed in the sections below.

The revised System Improvements spilling overview / plan and cost estimate have been provided in Appendix A. The system improvements to address those spills identified are included in Appendix D, Appendix E and Appendix F.

The following two sub-sections discuss additional areas that should be addressed in the System Improvements programme of work. Maps of these upgrades can be found in Appendix A.

2.1.1 Liverpool Street Pump Station Overflow / Cross Connection

An existing cross connection was found to still be open at the Liverpool Pump Station, in addition to the pump station overflow. Since only the pump station overflow was being checked in the model during System Improvements, the cross connection was overlooked and there was a significant volume found to be leaving the wastewater network. The plan view of the cross connection and pump station overflow can be seen in Figure 1 below.

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Figure 1 Liverpool Pump Station Cross Connection and Overflow Plan

The System Improvements were amended such that the overflow is no longer occurring. This required closing the cross connection, however leaving the pump station overflow open. With the added flow now being passed downstream, an increase in storage was required at Moutoa Gardens (32 m3 for the M12 gravity option and 38 m'for the M12 LPS option). To minimize the additional storage required, the pump station controls were adjusted to make use of the capacity of the pump station and upstream network.

During the model calibration stage, the pump station data for Liverpool Pump Station showed the pumps frequently turning on and off. The existing pumps have variable speed drives (VSDs), however their control philosophy is unknown. Based on the observed level data of the pump station, it was assumed that the controls could be further optimized to reduce the number of pump starts/stops each day, as well as utilise the upstream network capacity. Figure 2 below shows the existing and improved control philosophy. Note that the control philosophy is only preliminary and represents the pumps discharging at a higher rate at a higher operating level only.

GHD I Report for Whanganui District Council - VVhanganui City-Wide Growth, 51/33557/00 I 5

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2.5

—0—Existing Control Philosophy

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0 20 40 60 80 Discharge (L/s)

Figure 2 Optimised Liverpool Pump Station Control Philosophy

These improvements (and their associated costs) were incorporated in to the base model for both the M12 gravity upgrades and M12 LPS upgrades. The spill area was identified as Area AA, and the cost estimate was also revised.

It should be noted that the calibration events were once again run and the overflow was triggered in the model. It is therefore recommended that the pump station controls be adjusted, new flow data be collected, and the catchment be re-calibrated. The upgrades discussed above are indicative only until the catchment parameters are better understood.

2.1.2 Heads Road Manhole Spill

The model predicted minor spilling (<20 rn3) near the flow split on Heads Road, however once growth was applied in certain scenarios the spilling tipped over 20 m3. Since the spilling was triggered under the growth scenarios, they are further discussed in Sections 2.3.3 and 2.4. However the costs and upgrades have been incorporated in to the System Improvements programme as the model showed that this site was already spilling (<20 rn3) prior to adding growth.

2.2 Population Growth

As discussed in the previous Bulk Supply Investigation Report (January 2016), WDC identified three areas for growth:

1. General infill

i) Otamatea (Churton area)

ii) Springvale

iii) Inner city (excluding commercial)

iv) Commercial zone

v) Other residential

2. Greenfield development

i) Otamatea

ii) Springvale

6 GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 iii) Rural lifestyle zones

3. Rural zone development Rural lifestyle zones were not included in this project as it will not affect the existing wastewater network. Growth listed under "other residential" was distributed across the remaining sub- catchments as a proportion of the sub-catchment area. Population numbers and descriptions on how this growth was incorporated in to the model can be found in the previous report. Figure 3 identifies the extents of the growth areas from the District Plan being evaluated.

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81 GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 2.2.1 Greenfield Development Wastewater Network

Two options were evaluated for the proposed greenfield developments:

1. New gravity sewer, or

2. New LPS

Wastewater Flow

Based on the selected wastewater scheme, the flow from the new developments were added using either a synthetic dry weather diurnal curve or a constant inflow equal to the peak discharge from the LPS.

Background information on the synthetic dry weather curves can be found in the previous City- Wide Growth Report, under Section 3.1.1. Refer to the previous report for a description on how the gravity network was set up in the new Springvale development.

For the LPS option, the catchments were assigned a constant flow equal to the maximum peak discharge. The peak discharge was a factor of the number of dwellings within the catchment and the corresponding daily maximum number of pumps running simultaneously based on statistical analysis provided in the EOne publication, Low Pressure Sewer Systems Using Environment One Grinder Pumps (included as Appendix B). No population or wastewater profile was assigned to the sub-catchments. Similarly, no wet weather response was added to these catchments. It should be noted that this was considered to be a conservative approach, as the constant inflow is set to the peak discharge and therefore the overall volume from the LPS catchments would be over estimated.

Proposed Development Network Layouts

For the Springvale development, the internal gravity network was modelled since a structure plan had already been developed (refer previous report). For the LPS network, additional discharge points were identified based on the network layout. Table 2 summarises how the Springvale development and LPS was broken up into sub-catchments and where they discharged into the existing network.

Table 2 Springvale LPS Sub-Catchments

Sub-Catchment ID Sub-Catchment Number of Existing Network Discharge Point Area (ha) Dwellings

VVVVM00429 15.5 67 Rogers Street

VVWM00668 2.7 12 Tawhero Street

VVWM00827 23.2 99 Fox Road

VVVVM00827B 21.5 92 Fox Road

INWM00861 7.7 33 Buxton Road

VVVVM07871 19.1 82 Fitzherbert Avenue

WVVM07873 7.6 33 Kelsi Street

For the Otamatea development, no structure plan was provided and therefore the internal wastewater network was not modelled. Four sub-catchments were delineated and assigned to the nearest manhole. The discharge points for the LPS were the same as the gravity network discharge points.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 9

2.2.2 Scenarios

In total, ten scenarios were evaluated. Figure 4 below illustrates the relationship of these scenarios.

Base model M12 Gravity M12 LPS

Springvale Otamatea Springvale Otamatea infill Growth Development Development Development Development

(la) (2a) (3a) (4a) (5a) (lb) (2b) (3b) (4b) Scenario Springvale Springvale Otamatea Otamatea Springvale Springvale Otamatea Otamatea Gravity LPS Gravity LPS Infill Gravity LPS Gravity LPS Inf ill

Figure 4 Model Scenario Layout

10 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 2.3 Existing Network Capacity Investigation for Growth

2.3.1 lnfill Only

The model was first run with the 1 in 1 year system improvements (either with M12 gravity upgrades or M12 LPS) plus infill. This was done to indicate which areas within the network had capacity for infill.

The following results were predicted for both the M12 gravity upgrades and M12 LPS base models:

• The sewer from Otamatea that runs down the hill to Peakes Road and down Springvale Road was now surcharged, resulting in spilling on Virginia Heights / Sandy Lane.

• The Purnell Street sewer from Springvale was near capacity or exceeding.

• The City Interceptor up to Tregenna Pump Station was running at full capacity.

• Approximately 11 m3 of additional storage was required at Kowhai Park (1,336 m3 total) and 3 m3 of additional storage at River Reserve (85 m3 total).

For the M12 gravity upgrades system improvements only, the following results were predicted:

• The Castlecliff Interceptor was running at full capacity, with minor spilling predicted.

• Approximately 64 m3 of additional storage was required at Moutoa Gardens (1,433 m3 total).

• Approximately 7 m3 of additional storage was required at Bullocks Yard (191 m3 total).

For the M12 LPS system improvements only, the following results were predicted:

• The Castlecliff Interceptor was running at full capacity, however no additional spilling was observed.

• Approximately 38 m3 of additional storage was required at Moutoa Gardens (1,109 m3 total).

Appendix C provides an overview of the spill areas in the network with infill only for both M12 scenarios. With the exception of Otamatea, the model shows that infill has no significant impact on the network.

2.3.2 Greenfield Development

The greenfield development areas were then individually evaluated to accommodate the predicted growth in each area.

The following options were evaluated under each M12 system upgrade scenario:

1. Springvale gravity network

a. 1 in 1 year system improvements (SI) with M12 gravity upgrades

b. 1 in 1 year SI with M12 LPS

2. Springvale LPS

a. 1 in 1 year SI with M12 gravity upgrades

b. 1 in 1 year SI with M12 LPS

3. Otamatea gravity network

a. 1 in 1 year SI with M12 gravity upgrades

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Iii b. 1 in 1 year SI with M12 LPS

4. Otamatea LPS

a. 1 in 1 year SI with M12 gravity upgrades

b. 1 in 1 year SI with M12 LPS

Appendix C provides a network overview showing the location of each spill area for the different options and scenarios. In general, the upgrades required to resolve predicted spilling due to growth were unaffected by the system improvements M12 option (gravity or LPS). The extent of upgrades, however, was heavily dependent on the network scenario chosen for each greenfield development.

Table 3 below summarises the spilling / overflow results of each of the scenarios. Upgrades to eliminate spilling in the identified areas are discussed in the sections below.

Table 3 Summary of Predicted Spilling Scenario Number of Spilling Manholes* Total volume Spilled (m3)*

1. Springvale gravity network a) M12 gravity lt 25 b) M12 LPS 22

2. Springvale LPS network

a) M12 gravity 2" 538

b) M12 LPS 538

3. Otamatea gravity network

a) M12 gravity it 177

b) M12 LPS 1 175

4. Otamatea LPS network

a) M12 gravity it 30

b) M12 LPS 1 30

5. Infill

a) M12 gravity it 22

b) M12 LPS 1 22

* Manholes were only noted as spilling when the volume lost was greater than 20 m3. t Does not include the manhole on Heads Road that was on threshold of spilling (-19 m3) during System Improvements, but tipped over 20 rn3 in the growth scenario. This spill was addressed, however it was not ultimately attributed to growth and therefore not included in the table. Refer Section 2.3.3. t Manhole(s) were below the threshold for spilling (<20 rri') but upgrades were already required for 1 in 1 year System Improvements, so spilling was still addressed.

Installing a new LPS instead of a gravity network eliminates the wastewater diurnal curve and any wet weather response. In Otamatea, the model predicted more spilling in the gravity

12 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 network due to the wet weather response and the existing network's capacity to deal with the peaking. In contrast, a new LPS network in Springvale resulted in greater spilling because the LPS allowed the development to tie into the existing network at more points, therefore stressing more areas of the network, one of which was unable to cope with the new flow.

The M12 option (gravity or new LPS) had little to no effect on the growth scenarios.

2.3.3 1 in 1 Year System Improvements Revisions

As briefly mentioned in Table 3, some of the growth scenarios resulted in spilling on Heads Road. During the System Improvements phase, the model predicted spilling in this area, although just below the 20 m3 threshold. Since some of the growth scenarios tipped the spills just over the threshold volume, it was decided that the upgrades required to resolve spilling in this area be included in the System Improvements programme of work. These upgrades were applied to the base model (1 in 1 year system improvements with M12 gravity or M12 LPS upgrades) for every growth scenario, regardless if additional spilling was predicted by the model after growth was applied. The spill volume in this area was not included in the volume spilled due to growth.

This area was identified as Area BB, following the upgrades at Liverpool Pump Station (refer Section 2.1.1).

2.4 Upgrade Strategy

System upgrades were performed to eliminate spilling in the network for each discharge option for each of the different scenarios. As with System Improvements, the areas identified for improvement are locations where spilling greater than 20 m3 has been predicted by the model. Spills predicted by the model to be less than 20 m3 was considered unlikely to create the pressure required to open manhole lids in reality and therefore are unlikely to result in actual spills.

System improvements were chosen to address each spill area identified. There are three options presented in this report to address the spills:

1. Seal the manhole;

2. Upgrade the pipe to increase capacity; or

3. Provide storage.

The option chosen was dependent on the volume that was spilled, location of the spill, and relative cost of the upgrade alternatives.

Descriptions of these upgrade options can be found in the previous Wastewater Bulk Supply Investigation report (January 2016).

It should be noted that the maps of the upgrades in this report also include the upgrades required under the 1 in 1 year System Improvements. Refer to the Revised System Improvements Report (February 2016) for details of these upgrades.

2.5 System Upgrades for Growth Scenarios

The following sections discuss the upgrades required to meet the LOS containment target for each growth scenario and M12 system improvements option. Individual spill areas identified in the Revised System Improvements Report have not been included unless the improvements have changed as a result of growth. Maps of the upgrades common across all scenarios have been included separately in Appendix A and Appendix D. Maps of the upgrades specific to the selected scenario can be found in Appendix E.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 113 Due to minor instabilities within the model, it was found that storage volumes can vary slightly. Therefore no change was noted if the storage volume was within 3 rn3 of the 1 in 1 year System Improvements storage volume. This equates to $4,500, which is a very small portion of the total upgrade costs and was not considered a substantial differentiator when comparing and choosing between scenarios.

2.5.1 Scenario 1 a: Springvale Gravity with M12 Gravity System Improvements

Springvale greenfield development with a new gravity sewer resulted in spilling on Rogers Street due to insufficient downstream capacity within the existing network.

Area G-1 — Spilling from Springvale Development

The new Springvale development area discharges to the Raupo Street sewer in the Gonville / M12 catchment and the Fitzherbert Avenue sewer in the M7 catchment. Upgrades at the top of the M12 catchment were required to eliminate spilling in Gonville as follows:

• 229 m of 450 mm diameter gravity main on Puriri Street (VVVVM00448 to VVWM00463)

• 98 m of 225 mm diameter gravity main on Rogers Street (WVVM00447 to WWM00448)

In addition, 59 m of 150 mm diameter gravity main needed to be re-laid with a new manhole in order to connect the new development to Rogers Street.

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 10 m3 of additional storage was required at Moutoa Gardens (1,379 m' total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, approximately 18 rn3 of additional storage was required at Heads Road (273 m3 total). No additional storage was required at Hinau Street.

Area W — Spilling Off SH3

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 4 rn3 of additional storage was required at the Bullocks Yard (188 rn3 total).

Area BB — Heads Road Manhole Spill

A flow split with weir was identified by WDC staff on Heads Road, allowing flow directly north of BRPS to be split between the 375 mm Beach Road sewer and the 300 mm sewer that runs parallel to the open drain next to Tasman Tanning. During System Improvements the model predicted spilling here less than 20 rn3, however only just under the threshold level. During this growth scenario the spilling tipped over 20 m3. Due to the fact that the spilling attributed to growth is only marginal, it was decided that this spill area be addressed but the costs associated with it be assigned to the System Improvements programme of works (refer Section 3).

Spilling in this area was attributed to network constraints on both branches; however the western branch showed greater downstream capacity. Additional flow was therefore directed down the Tasman Tanning sewer by upgrading approximately 239 m with 225 mm diameter gravity sewer (VVWM05021 to WWM05076), removing the weir at VVWM05035, and relaying the flow split pipe at a steeper grade by matching the inverts of the upstream and downstream manholes and upgrading to 225 mm diameter gravity main (26 m from WWM05035 to VVVVM05021).

14 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 A map of the upgrades has been provided in Appendix A.

2.5.2 Scenario 1 b: Springvale Gravity with M12 LPS System Improvements

Under the M12 LPS option, the new Springvale development area discharges to the new Rogers Street / Balgownie Landfill bypass. The Springvale greenfield development, with new gravity sewer, resulted in minor spilling on Rogers Street, both upstream and downstream of the bypass, due to insufficient capacity within the existing network.

Area G-1 — Spilling from Springvale Development

With the new Rogers Street / Balgownie Landfill bypass, all flow from the development is passed through the 375 mm bypass instead of the 375 /450 mm Raupo / Puriri Street sewer mains. The reduced downstream capacity required upgrades at the top of Rogers Street to eliminate spilling as follows:

• 59 m of 225 mm diameter gravity main laid at a steeper grade from WVVM00436 to VVWM00429

• 98 m of 225 mm diameter gravity main from VVVVM00447 to VWVM00448

Upgrades at the bottom of Rogers Street between the Balgownie Landfill and Gilberd Street were required as follows:

• 356 m of 450 mm diameter gravity main from VVWM00610 to VVVVM00614

An increase on an upgrade required under the 1 in 1 year system improvements was also required, and has been included under Area T.

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 4 rn3 of additional storage was required at Moutoa Gardens (1,075 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, 12 m of a 375 mm diameter upgrade for system improvements was increased to 450 mm diameter.

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

Due to the fact that the spilling attributed to growth is only marginal, it was decided that this spill area be addressed but the costs associated with it be assigned to the System Improvements programme of works (refer Section 3). A map of the upgrades has been provided in Appendix A.

2.5.3 Scenario 2a: Springvale LPS with M12 Gravity System Improvements

Under the LPS scenario, the new Springvale development area discharges to the Rogers Street, Tawhero Street, Fox Road, Buxton Road, Fitzherbert Avenue and Kelsi Street sewers. Since flow is distributed across several catchments, spilling in Gonville was not predicted. However the model did show that the Fox Road Pump Station was causing spilling upstream due to the increase in base flow from the development.

Area G-2 — Spilling Upstream of Fox Road Pump Station

Springvale greenfield development with a new LPS resulted in spilling on Fox Road due to the Fox Road Pump Station just downstream. The Fox Road Pump Station has a discharge

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 115 capacity of 8 Us. The peak discharge from the new greenfield development on that branch was approximately 8 Ifs, and therefore the pump station was unable to draw down the level in the upstream network. In order to prevent spilling the Fox Road Pump Station had to be increased by 2 Vs in order to accommodate growth and eliminate spilling upstream, for a total capacity of 101/s.

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 58 m3 of additional storage was required at Moutoa Gardens (1,427 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, approximately 20 rn3 of additional storage was required at Heads Road (275 m3 total).

No additional storage was required at Hinau Street.

Area W — Spilling Off 5H3

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 7 m3 of additional storage was required at the Bullocks Yard (191 m3 total).

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario 1a, Section 2.5.1.

2.5.4 Scenario 2b: Springvale LPS with M12 LPS System Improvements

In addition, the M12 LPS option includes a new Rogers Street! Balgownie Landfill bypass. The Springvale greenfield development LPS therefore discharges to the new Balgownie Landfill bypass. This resulted in minor spilling on the M12 bypass connecting Rogers Street North and South due to insufficient downstream capacity.

Area G-1 — Spilling from Springvale Development

Upgrades at the bottom of Rogers Street between the Balgownie Landfill and Gilberd Street were required as follows:

• 140 m of 450 mm diameter gravity main from VVVVM00613 to VVVVM00614

An increase on an upgrade required under the 1 in 1 year system improvements was also required, and has been included under Area T.

Area G-2 — Spilling Upstream of Fox Road Pump Station

Springvale greenfield development with a new LPS resulted in spilling on Fox Road due to the Fox Road Pump Station just downstream.

The upgrades required were the same as Scenario 2a, Section 2.5.3.

16 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 23 m3 of additional storage was required at Moutoa Gardens (1,094 rri3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, 12 m of a 375 mm diameter upgrade for system improvements was increased to 450 mm diameter.

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

2.5.5 Scenario 3a: Otamatea Gravity with M12 Gravity System Improvements

In Otamatea spilling was predicted on Great North Road with minor spilling on Sandy Lane due to network capacity constraints.

The Otamatea wastewater network ultimately discharges to Springvale Road, where the elevation drops several times, thereby isolating some of the spill areas. Improvements were therefore required in three different areas: Great North Road, Virginia Heights, and Peakes Road / Springvale Road.

Minor spilling at the top of the catchment was predicted, however the invert levels for these manholes were unknown and assumed to be ground level minus one metre. These were therefore ignored as they were less than 20 m3 and did not have reliable network information.

Area G-3 — Spilling from Otamatea Development

Pipe Upgrades

The network along Great North Road was upgraded and a bypass was modelled continuing the Great North Road sewer instead of first conveying the flow to Virginia Road before continuing on to Virginia Heights. Upgrades on Virginia Heights and down to Sandy Lane were also required to accommodate the increase in flow. In total the following upgrades were required:

• 72 m of 225 mm diameter gravity main (VVWM04405 to VVVVM04380)

• 134 m of 300 mm diameter gravity main (VVWM04380 to VWVM04417)

• 28 m long, 225 mm diameter bypass from \NWM04417 to VVWM04462

• 773 m of 225 mm diameter gravity main (WWM04462 to VVWN04479)

Storage

As the sewer drops to Sandy Lane, a storage structure at VVVVM04479 was required to capture the larger peak flow from upstream without overloading the network downstream. Approximately 93 rn3 of storage was required in the park at the top of Sandy Lane with a 6 m length of 150 mm diameter pipe to serve as a choke.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 117 Area G-4 — Spilling on Sandy Lane

Before spilling was addressed in Area G-3, the model predicted only minor spilling on Sandy Lane (< 4 m3). However once the network upstream was upgraded to handle the additional flow from the Otamatea development, spilling on Sandy Lane and further downstream was predicted by the model.

Approximately 158 m of 225 mm diameter gravity main was required from the new storage structure to the intersection of Sandy Lane and Montgomery Road (VVWM04479 to VVWM01182).

Upgrades further downstream were then required to handle the increase in flow, as follows:

• 436 m of 300 mm diameter gravity main behind Peakes Road (VVWM01188 to VVVVM01195)

• 597 m of 300 mm diameter gravity main on Springvale Road (VVWM01094 to VVWM01109)

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 35 m3 of additional storage was required at Moutoa Gardens (1,404 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, approximately 4 rn3 of additional storage was required at Heads Road (259 rn3 total).

No additional storage was required at Hinau Street.

Area W — Spilling Off SH3

No additional storage was required at the Bullocks Yard.

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

2.5.6 Scenario 3b: Otamatea Gravity with M12 LPS System Improvements

Spilling associated with the Otamatea greenfield development was found to be independent of the M12 option. Similar to Scenario 3a, the model predicted spilling on Great North Road with minor spilling on Sandy Lane due to network capacity constraints.

18 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Area G-3 — Spilling from Otamatea Development

Pipe Upgrades

The upgrades required were the same as Scenario 3a, Section 2.5.5.

Storage

As the sewer drops to Sandy Lane, a storage structure at VVVVM04479 was required to capture the larger peak flow from upstream without overloading the network downstream.

The volume of storage required was the same as Scenario 3a, Section 2.5.5.

Area G-4 — Spilling on Sandy Lane

The upgrades required were the same as Scenario 3a, Section 2.5.5.

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 15 m3 of additional storage was required at Moutoa Gardens (1,086 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

No additional upgrades were required.

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

2.5.7 Scenario 4a: Otamatea LPS with M12 Gravity System Improvements

In Otamatea spilling was predicted on Great North Road with minor spilling on Sandy Lane due to network capacity constraints.

The Otamatea wastewater network ultimately discharges to Springvale Road, where the elevation drops several times, thereby isolating some of the spill areas. Improvements were therefore required in two different areas: Great North Road and Virginia Heights.

Area G-3 — Spilling from Otamatea Development

Spilling occurred just off of Great North Road due to downstream capacity constraints. The existing network conveys flow from the top of Great North Road to Virginia Road before continuing on to Virginia Heights. A 28 m long, 150 mm diameter bypass between VVWM04417 and VVWM04462 was added at the intersection of Great North Road and Virginia Road, connecting the two separate segments of Great North Road and therefore splitting the flow.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 119 Area G-4 — Spilling on Sandy Lane

Before spilling was addressed in Area G-3, the model predicted only minor spilling on Sandy Lane (< 4 m3). However once the network upstream was upgraded to handle the additional flow from the Otamatea development, greater spilling on Sandy Lane was predicted by the model.

Approximately 164 m of 225 mm diameter gravity main between VWVM04479 and VVVVM01182 were required to eliminate spilling.

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 46 m3 of additional storage was required at Moutoa Gardens (1,415 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, approximately 8 m3 of additional storage was required at Heads Road (263 m3 total).

No additional storage was required at Hinau Street.

Area W — Spilling Off SH3

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 5 m3 of additional storage was required at the Bullocks Yard (189 m3 total).

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

2.5.8 Scenario 4b: Otamatea LPS with M12 LPS System Improvements

Spilling associated with the Otamatea greenfield development was found to be independent of the M12 option. Similar to Scenario 4a, the model predicted spilling on Great North Road with minor spilling on Sandy Lane due to network capacity constraints. With the exception of storage along the interceptor, the upgrades in Otamatea are the same as Scenario 4a.

The Otamatea wastewater network ultimately discharges to Springvale Road, where the elevation drops several times, thereby isolating some of the spill areas. Improvements were therefore required in two different areas: Great North Road and Virginia Heights.

Area G-3 — Spilling from Otamatea Development

Spilling occurred just off of Great North Road due to downstream capacity constraints.

The upgrades required were the same as Scenario 4a, Section 2.5.7.

Area G-4 — Spilling on Sandy Lane

The upgrades required were the same as Scenario 4a, Section 2.5.7.

20 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 28 m3 of additional storage was required at Moutoa Gardens (1,099 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

No additional upgrades were required.

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

Due to the fact that the spilling attributed to growth is only marginal, it was decided that this spill area be addressed but the costs associated with Et be assigned to the System Improvements programme of works (refer Section 3). A map of the upgrades has been provided in Appendix A.

2.5.9 Scenario 5a: Infill with M12 Gravity System Improvements

Population was added across the entire Whanganui catchment in accordance with the Strategic Planning growth estimates. Most of the catchment was able to handle the increase in flow, with the exception of the Sandy Lane sewer in Otamatea. Spilling was predicted on Sandy Lane due to downstream capacity constraints.

Additional storage was also required in Wanganui East to accommodate the growth from infill.

Area G-4 — Spilling on Sandy Lane

Spilling was predicted on Sandy Lane at the foot of the hill. In order to eliminate spilling, approximately 69 m of 225 mm diameter gravity main between VVVVM04480 and WVVM01182 were required.

Area B — Spilling and Overflows on Wanganui East Interceptor

Due to the increase in flow from growth from infill, approximately 11 m3 of additional storage was required at Kowhai Park (1,336 m3 total).

Similarly, approximately 3 m3 of additional storage was required at the River Reserve (85 m3 total).

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 64 m3 of additional storage was required at Moutoa Gardens (1,433 m3 total).

No additional storage was required at Laird Park.

Area T — Spilling in Gonville

Due to the increase in flow from growth, approximately 14 m3 of additional storage was required at Heads Road (269 m3 total).

No additional storage was required at Hinau Street.

Area W — Spilling Off SH3

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 7 m3 of additional storage was required at the Bullocks Yard (191 m3 total).

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 21 Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

2.5.10 Scenario 5b: Infill with M12 LPS System Improvements

Population was added across the entire Whanganui catchment in accordance with the Strategic Planning growth estimates. Most of the catchment was able to handle the increase in flow, with the exception of the Sandy Lane network in Otamatea. Similar to Scenario 5a, the model predicted spilling on Sandy Lane due to network capacity constraints.

Additional storage was also required in Wanganui East to accommodate the growth from infill.

Spilling associated with infill was found to be independent of the M12 option. Aside from storage volumes, the network upgrades were the same as those required for Scenario 5a.

Area G-4 — Spilling on Sandy Lane

Spilling was predicted on Sandy Lane at the foot of the hill.

The upgrades required were the same as Scenario 5a, Section 2.5.9.

Area B — Spilling and Overflows on Wanganui East Interceptor

Due to the increase in flow from growth from infill, additional storage was required.

The volume of storage required was the same as Scenario 5a, Section 2.5.9.

Area L — Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 38 m3 of additional storage was required at Moutoa Gardens (1,109 m3 total).

Area T — Spilling in Gonville

No additional upgrades were required.

Area BB — Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

2.6 Summary of Modelling Results

The modelling results show that:

• Flow from the Springvale greenfield development only had a minor impact on the existing network, depending on the servicing option used.

• The network in Otamatea is at full capacity, and any additional growth (infill or greenfield development) required network upgrades.

• Upgrades for infill and Otamatea greenfield development were independent of the City Interceptor (with the exception of storage).

22 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 • Excluding Otamatea, growth from infill only had a minor impact on the existing network in the form of larger storage requirements and a single pipe upgrade.

GHD i Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 23 3. Combined Growth Network Assessment

3.1 Workshop Outcomes

Following the preliminary investigation into the individual growth scenarios, a workshop was held on 15 March 2016 with members of GHD and WDC. The System Improvements and associated costs (refer Section 4.1) were presented to WDC in order to identify the preferred network options and determine the final costs associated with all growth being combined.

The following combined growth option was developed:

• 1 in 1 year System Improvements would include the M12 gravity upgrades

• Springvale greenfield development would be comprised of a new gravity network

• Otamatea greenfield development would be comprised of a new LPS

• General infill as previously modelled

3.2 Existing Network Capacity

The model was first run with the 1 in 1 year system improvements for M12 gravity upgrades plus infill (Scenario 5a) upgrades, Springvale Gravity (Scenario la) upgrades, and Otamatea LPS (Scenario 4a) upgrades. This was done to indicate which areas within the network had capacity to accommodate all of the growth and if additional upgrades were required.

Appendix C provides an overview of the spill areas in the network for the combined growth scenario. With the exception of Otamatea, the model shows that the combined growth has no significant impact on the network with 1 in 1 year system improvements.

3.3 System Upgrades for Combined Growth

The following sections discuss the upgrades required to meet the LOS containment target for the combined growth option chosen at the WDC workshop. Individual spill areas identified in the Revised System Improvements Report have not been included in this section unless the improvements have changed as a result of growth. Maps of the upgrades that have not changed since the 1 in 1 year System Improvements (unaffected by growth) have been included separately in Appendix A and Appendix D. Maps of the upgrades specific to the combined growth scenario can be found in Appendix F. These include the upgrades required under the individual growth scenarios.

Similar to the Preliminary Network Assessment (Section 2), no change in storage was noted if the storage volume was within 3 m3 of the original 1 in 1 year System Improvements storage volume.

With all of the growth combined (and the upgrades required under each individual growth scenario) the model only predicted spilling in Otamatea.

Area G-1 — Spilling from Springvale Development

The upgrades required were the same as Scenario la, Section 2.5.1.

Area G-3 — Spilling from Otamatea Development

Spilling occurred just off of Great North Road due to downstream capacity constraints.

24 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 In addition to the upgrades required in Scenario 4a, Section 2.5.7, additional pipe upgrades were then required to accommodate the combined flows from the Otamatea greenfield development and infill, as follows:

• 134 m of 225 mm diameter gravity main between VW1M04380 to VVWM04417 was required upstream of the new bypass.

• 195 m of 225 mm diameter gravity main between VVVVM04472 to VWVM04474 after the Great North Road and Virginia Road mains connect.

Area G-4 – Spilling on Sandy Lane

Under the Otamatea greenfield development scenario (Scenario 4a Section 2.5.7), approximately 164 m of 225 mm diameter gravity main between VVWM04479 and VVWM01182 was required to eliminate spilling—less was required under the infill only scenario.

Before spilling from the combined growth was addressed in Area G-3, the model did not predict any spilling further downstream on Springvale Road. However once the network upstream was upgraded to handle the combined flow, spilling on Springvale Road was predicted by the model. Approximately 223 m of 300 mm gravity main on Springvale Road between Sussex Road and Treadwell Street (WWM01098 and VVVVM01109) was required.

Invert levels upstream of VVWM01098 were assumed in the model, resulting in a step change at that manhole. An additional 85 m was upgraded to 300 mm diameter gravity main on Springvale Road from VWVM01097 to VVWM01098, and was laid at a steeper grade to match the invert level of the downstream manhole.

It should be noted that there is a parallel sewer on Springvale Road. Possible cross connections were investigated, however the depths of the sewers and the large diameter storm drain running between the two sewers did not make this a viable option.

Area B – Spilling and Overflows on Wanganui East Interceptor

Due to the increase in flow from growth from infill, approximately 11 m3 of additional storage was required at Kowhai Park (1,336 m3 total).

Similarly, approximately 3 m' of additional storage was required at the River Reserve (85 rn3 total).

Area L – Spilling in Central City

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 114 rn3 of additional storage was required at Moutoa Gardens (1,483 rn3 total).

No additional storage was required at Laird Park.

Area T – Spilling in Gonville

Due to the increase in flow from growth, approximately 32 m3 of additional storage was required at Heads Road (287 m3 total).

No additional storage was required at Hinau Street.

Area W – Spilling Off SH3

Due to the increase in flow from growth and higher levels in the Interceptor, approximately 13 rn3 of additional storage was required at the Bullocks Yard (197 m3 total).

Area BB – Heads Road Manhole Spill

The upgrades required were the same as Scenario la, Section 2.5.1.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 25 Due to the fact that the spilling attributed to growth is only marginal, it was decided that this spill area be addressed but the costs associated with it be assigned to the System Improvements programme of works (refer Section 3). A map of the upgrades has been provided in Appendix A.

3.4 Summary of Modelling Results

The modelling results show that:

• Aside from storage, additional pipe / network upgrades were only required in Otannatea with all of the growth areas combined.

• No additional upgrades to those required for greenfield development were required in the Springvale development / Gonville area due to infill.

• Approximately 173 m3 of additional storage was required across the network to accommodate the proposed peak wet weather flows from growth.

26 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 4. Costs

The preliminary cost estimates presented in this report have been developed for the purposes of high level budget decisions and should not be used for any other purpose. The scope and quality of the works has not been fully defined and therefore the estimates are not warranted by GHD. These estimates are typically developed based on cost curves, budget quotes for some equipment items, extrapolation of recent similar project pricing, and GHD experience. The accuracy of the estimates is recommended for budget setting purposes only.

The detailed breakdown of the cost estimate has been provided in Appendix G for each of the individual scenarios and Appendix H for the combined growth scenario. As this analysis was conducted following System Improvements, the upgrades previously proposed were revisited and reduced where possible. Any change to the System Improvements cost estimate has been included in the tables below.

As mentioned in Section 2.1.1, Area AA was not included in the costs associated with growth because this overflow was occurring during System Improvements. This cost was incorporated in to the System Improvements base cost.

Similarly, the spill Area BB ultimately was not included in the costs associated with growth, but instead added to the System Improvements costs. This is because spilling in this area during System Improvements was just below the threshold, and growth only marginally increased that spilling to just over the threshold limit of 20 m3. The costs associated with eliminating spilling in this area have also been included in the System Improvements base cost.

4.1 Individual Growth Scenarios

The following sections provide a preliminary estimate of the costs associated with each growth scenario. They are shown as the difference in cost from the 1 in 1 year System Improvements. These costs only account for existing network upgrades incurred by WDC, and do not include any developer costs.

The detailed breakdown of the cost estimate has been provided in Appendix G for each scenario.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 27 4.1.1 Springvale Greenfield Development

Table 4 summarises the costs associated with the Springvale greenfield development under the various scenarios. Table 4 Preliminary Springvale Greenfield Development Remedial Works Cost Comparison

Scenario Pre-Growth Additional Total Cost of Cost per System Costs for Remedial Dwellingt Improvements* Growth Works

1 a: Springvale gravity $13,083,000 $205,000 $13,288,000 $492 network with M12 gravity system improvements

1 b: Springvale gravity $16,724,000 $232,000 $16,956,000 $556 network with M12 LPS system improvements

2a: Springvale LPS network $13,083,000 $186,000 $13,269,000 $446 with M12 gravity system improvements

2b: Springvale LPS network $16,724,000 $159,000 $16,883,000 $381 with M12 LPS system improvements

*System Improvements cost includes upgrades required to resolve spilling in Areas AA and BB. t The number of dwellings used (417) was taken from the District Plan provided by WDC.

The cost estimates show that there was a marginal difference in the cost of growth between the M12 gravity and M12 LPS options, as storage along the interceptor was not greatly affected by growth.

When considering the discharge from the new development area, installing a new LPS in the Springvale greenfield development area would require fewer upgrades than a new gravity network. Although the upgrades would be cheaper for Council, they will likely be much greater for the developer! community. In order to price a new LPS, an estimate of $10,000 has typically been applied for each property. This will likely result in the total development cost being greater than the costs associated with a new gravity sewer.

There are minimal gains in installing a new LPS in the Springvale development area. The exception to this is the additional discharge points that would enable development to occur in different sub-sections. Based on the structure plan used for this investigation, the gravity network involves a small sub-section discharging to the Fitzherbert Avenue sewer, and the majority discharging to a new trunk main that discharges to the Rogers Street sewer. In order to develop this area, construction of the trunk main would first be required. Although an alternative gravity network could be considered that utilises pump stations, this scenario was not modelled as it was outside the scope of work, but could be considered in future analysis.

28 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 4.1.1 Otamatea Greenfield Development

Table 4 summarises the costs associated with the Otamatea greenfield development under the various scenarios. Table 5 Preliminary Otamatea Greenfield Development Remedial Works Cost Comparison

Scenario Pre-Growth Additional Total Cost of Cost per System Costs for Remedial Dwell ingt Improvements* Growth Works

3a: Otamatea gravity network $13,083,000 $1,575,000 $14,658,000 $8,799 with M12 gravity system improvements

3b: Otamatea gravity network $16,724,000 $1,539,000 $18,263,000 $8,598 with M12 LPS system improvements

4a: Otamatea LPS network $13,083,000 $154,000 $13,237,000 $860 with M12 gravity system improvements

4b: Otamatea LPS network $16,724,000 $115,000 $16,839,000 $642 with M12 LPS system improvements

* System Improvements cost includes upgrades required to resolve spilling in Areas AA and BB. The number of dwellings used (179) was taken from the District Plan provided by WDC.

The cost estimates show that there was a marginal difference between the M12 gravity and M12 LPS options, as storage along the interceptor was not greatly affected by growth. When considering the discharge from the new development area, installing a new LPS in the Otamatea greenfield development area would be significantly less than that of a new gravity network. This is due to the existing network not being able to cope with the additional wet weather response and diurnal peaking factor.

Fewer upgrades were required to accommodate the peak discharge from the LPS system; however the developer / community costs associated with constructing a new LPS were not incorporated in the estimates. In order to price a new LPS, an estimate of $10,000 has typically been applied for each property. Although gravity sewers are typically less expensive than LPS, the Otamatea development area is unique in that the terrain consists of multiple ridges and depressions, particularly in the northern half of the development area. In order to install a new gravity network to service this area, pump stations would likely be required, thereby increasing the cost of a gravity network.

Without creating a structure plan, it appears that a new LPS within the Otamatea development area may be the better solution.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 129 4.1.1 Infill

Table 4 summarises the costs associated with growth due to infill only.

Table 6 Preliminary Infill Remedial Works Cost Comparison

Scenario Pre-Growth Additional Total Cost of Cost per System Costs for Remedial Dwellingl Improvements* Growth Works

5a: Infill with M12 gravity $13,083,000 $173,000 $13,256,000 $88 system improvements

5b: Infill with M12 LPS $16,724,000 $102,000 $16,826,000 $52 system improvements

*System Improvements cost includes upgrades required to resolve spilling in Areas AA and BB. t The number of dwellings used (1,972) was taken from the District Plan provided by WDC.

The cost estimates show that, when considering growth due to infill only, the cheaper option would be installing a new LPS to address spilling in M12. The LPS in M12 freed up capacity along the interceptor and required less storage. Although infill does not result in a lot of spilling throughout the network, the storage facilities required for the M12 upgrades were utilised, resulting in larger storage volumes.

4.1.2 Summary

After estimating the costs required in the existing wastewater network to accommodate future growth, the following results were found:

• Although the network upgrades required for a new LPS network in the Springvale greenfield development area were less expensive than those required for a new gravity network, the costs incurred by the developer / community would likely be greater for a new LPS. Therefore there are only marginal gains for a LPS network.

• The costs associated with network upgrades for the Otamatea greenfield development area indicated a new LPS serving the area was less expensive than a new gravity sewer. However, given the topography and the significant difference in costs, a structure plan should be developed prior to choosing one of the growth scenarios.

There was only a marginal difference between the M12 gravity and M12 LPS options when considering growth in the Springvale and Otannatea greenfield development areas.

• When considering growth due to infill, the upgrades required under the M12 LPS option cost less than those required under the M12 gravity option.

4.2 Combined Growth Scenarios

As discussed in Section 3, the individual growth scenarios were presented to WDC at a workshop and a final combined growth scenario was chosen.

The following section provides a preliminary estimate of the costs associated with each growth area, and incorporates any upgrade costs required when all growth areas are present. It should be noted that these costs only account for upgrades to the existing network that the Council would incur, and do not include any developer costs. The upgrades exclude the option of duplicate mains. The costs provided should not be used directly to determine development contribution costs. The calculation of development contributions is outside the scope of this report. Typically, development cost calculations include allowances for the cost of the wastewater network capacity consumed throughout the network (including the existing network

30 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 that has sufficient capacity) and likewise consideration for the extent the existing wastewater flows contribute to the capacity of any upgrade required.

The detailed breakdown of the cost estimate has been provided in Appendix H.

Table 7 below summarises the costs for growth of the individual growth scenarios and the scenario where all growth areas are combined. It should be noted that this is a total cost comparison, and therefore the costs for combined growth incorporate the upgrades required under each individual growth area.

Table 7 Comparison of Costs for Growth Scenarios in Each Spill Area

Spill Area Scenario la Scenario 4a Scenario 5a Combined Growth

$0 $0 $22,000 $22,000

$15,000 $67,000 $94,000 $171,000

$27,000 $12,000 $21,000 $48,000

$0 $8,000 $11,000 $20,000

G-1 $163,000 $163,000

G-3 $8,000 $126,000

G-4 $59,000 $25,000 $189,000

TOTAL $205,000 $154,000 $173,000 $739,000

4.2.1 Growth Area Flow Contributions

In Section 4.1 costs were able to be assigned to the individual growth area as each area was modelled and analysed separately. However, once all of the growth areas were combined, additional upgrades were required. In order to assign the additional costs to the appropriate growth area, the change / increase in peak flow due to growth was used. Table 8 below summarises the increase in peak flow due to growth in the different areas. The additional flow is taken from the individual growth scenario modelled minus the peak flow from the base model (existing network with 1 in 1 year system improvements).

Table 8 Additional Flow Attributed to Growth

Growth Area Land Area (ha) Number of Additional Flow (Us) Dwellings

Springvale Development 92 417 8.95

Otamatea Development 141 179 12.50

Otamatea Infill 58 455 16.13

Springvale Infill 179 731 16.77

Inner City 'nth! 90 334 8.40

Commercial Infill 116 197 3.86

Other Residential Infill 1,624 255 5.16

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 31 A ratio of the additional flows was then used to determine how the upgrades in the different spill areas could be assigned to the individual growth areas. Table 9 provides a breakdown of the allocated costs for upgrades associated with growth for each growth area.

It should be noted that growth due to infill was separated into the categories / areas provided in the Structure Plan. This enabled the spill areas and relevant costs to be better assigned to growth areas based on their proximity and interaction with the spill area. For example, all of the infill has an impact on storage along the interceptor; however the upgrades required for area G- 4 were affected by the Otamatea development, Otamatea infill, and Springvale infill only, as only a fraction of the infill growth is upstream of the spill area. Therefore the increase in peak flow due to infill, and hence the cost of upgrades for infill, is more representative of the growth occurring in that area.

Conversely, the "other residential infill" area was not further broken down due to the small growth density. Therefore costs for additional storage required on the east side of the Whanganui River (spill area B) were assigned to the total "other residential infill". Although this growth area encompasses both sides of the river, further delineating the growth area would have minimal impact on the overall costs per dwelling.

Table 10 provides a summary of the costs for growth in each growth area, as well as the cost per dwelling in that growth area.

32 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Table 9 Prorated Costs for Combined Growth in Each Growth Area

Growth Area Spill Area Total Cost per Growth Area VV G-1 G-3 G-4

Springvale Development - $14,367 $25,480 - $163,0001 - - $202,847

Otamatea Development - $66,116 $9,877 $8,203 $59,519 $104,844 $248,559

Otamatea Infill - $29,015 $4,052 $3,782 $66,481 $62,497 $165,827

Springvale Infill - $30,167 $4,213 $3,932 - - $21,659* $59,971

Inner City Infill - $15,110 $2,110 $1,969 - - - $19,190

Commercial Infill $6,944 $970 $905 - - $8,818

Other Residential [nth! $22,000* $9,281 $1,298 $1,209 - - $33,788

TOTAL GROWTH COSTS $22,000 $171,000 $48,000 $20,000 $163,000 $126,000 $189,000 $739,000

*Only a fraction of the dwellings categorized under "other residential infill" would attribute to these costs. 1-Although Other Residential Infill includes catchments in Gonville, no additional upgrades were required here when evaluated individually. :Prorated cost was based on 1/3 of the flows in the Springvale in fill area only. This is because approximately 1/3 of the Springvale in fill area contributed to the flow in this section of the network requiring upgrades.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 33 Table 10 Summary of Costs for each Growth Area

Growth Area Number of Total Cost Cost per Dwelling Dwellings

Springvale Development 417 $202,847 $486

Otamatea Development 179 $248,559 $1,389

Otamatea Infill 455 $165,827 $364

Springvale Infill 731 $59,971 $82

Inner City Infill 334 $19,190 $57

Commercial 'WI 197 $8,818 $45

Other Residential Infill 255 $33,788 $133

1 in 1 Year System Improvements N/A $13,083,000 N/A

TOTAL $13,822,000

4.2.2 Summary

After estimating the costs required in the existing wastewater network to accommodate all future growth, the following results were found:

• The area requiring the most upgrades was Otamatea (spill areas G-3 and G-4). When growth from infill and Otamatea greenfield development were evaluated separately, the largest costs were attributed to additional storage in Moutoa Gardens (spill area L). However, when infill and development are combined, the existing network in Otamatea requires additional upgrades that surpass the cost of additional storage requirements in any of the other spill areas.

• The cost per dwelling increased from $860 when considering Otamatea greenfield development only (Scenario 4a) to $1,389 when looking at combined growth. This is still smaller than the estimated Scenario 3a cost per dwelling.

• The average cost per dwelling for infill increased from $88 to $146, largely due to the additional upgrades required in Otamatea.

• When considering infill, the regions that contribute most towards the net upgrades are Otamatea Infill, Springvale IntlII and Other Residential Infill. This is due to the fact that Other Residential Infill is the sole contributor to increased storage costs in Wanganui East (spill area B), and because of the upgrades required in Otamatea (spill areas G-3 and G- 4) that are only affected by Otamatea and Springvale Infill regions.

• The cost for upgrades due to growth accounts for only 5% of the upgrades required under System Improvements.

34 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Prioritisation

Several decisions must be made by the Council before developing a programme of works to address growth. Aside from choosing between the two different M12 upgrade options, previous reports prepared by GHD have highlighted the sensitivity of the upgrades to the Central City (M4 catchment) flows. The model predicted significant spilling in this catchment during relatively minor rain events, which was not observed in reality to the extent or frequency predicted by the model. WDC is currently investigating this catchment to locate and isolate any point of inflow in the public system in the lower reaches of the M4 catchment. The results of this investigation will likely have a significant impact on the 1 in 1 Year System Improvements for this catchment, as well as other areas that are sensitive to the interceptor level—including storage requirements in Moutoa Gardens. Furthermore, as discussed in Section 4.1.2, additional consideration should be given to the wastewater scheme in Otamatea. As previously discussed, the extent of upgrades in Otamatea for either a gravity scheme or LPS scheme is vastly different. In addition, the topography of the area puts limits on the feasibility of the selected wastewater scheme. It was therefore recommended that a structure plan be developed prior to choosing one of the growth scenarios. This will then affect the storage options along the interceptor, in addition to the upgrades required in Otamatea. The system upgrades are contingent upon the following:

1. Results from the Central City (M4 catchment) inflow investigation

2. Selection of the M12 / Gonville catchment upgrades

3. Selection of the Springvale development wastewater scheme

4. Selection of the Otamatea development wastewater scheme During the workshop held on 15 March 2016, WDC indicated their preferred network options for M12 / Gonville, the proposed Springvale development, and the proposed Otamatea development as follows:

• M12 / Gonville gravity network upgrades

• Springvale gravity wastewater scheme

• Otamatea LPS wastewater scheme As mentioned above, these preferred options are contingent on the results from the M4 investigation, as well as further investigation into the greenfield development wastewater schemes. There are, however, portions of the improvement plan that are not affected by the issues highlighted above. WDC can commence works on the following areas:

• M1 investigations (currently underway)

• Carry out inflow reduction through Level 1 works for the catchments identified in the 2015 System Improvements Report

• Carry out BRPS control optimisation • Commence upgrades for the following areas: — Area I: Spilling at top of Halswell Street — Area J: Spilling in Peak Park — Area 0: Overflow at Plunket Street Pump Station

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 35 — Area S: Spilling in Kings Avenue Area — Area BB: Heads Road Manhole Spill The cost associated with this specific programme of works is approximately $3.8M. While these are underway the M4, M12, and Otamatea upgrades can be addressed and the remaining programme of works be updated accordingly.

36 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 6. Conclusions

Following the assessment of the impact that the additional wastewater flows from the proposed infill and development areas will have on the existing wastewater network, the following conclusions have been reached:

1. Cost estimates indicated a gravity wastewater scheme in Springvale to be marginally better when considering additional costs incurred by the developer / community. On the other hand, a LPS wastewater scheme in Otamatea was found to require less network upgrades than a gravity wastewater scheme.

2. Infill development was likely to have minimal impact on the existing network as the only resultant additional flows to the network are expected to be normal foul water flows (dry weather flows) which only make up a small proportion of the peak flow (wet weather flows). When considering infill alone, the costs for additional storage were greater than the costs required for additional storage for the greenfield developments.

3. Greenfield developments required additional infrastructure. The Otamatea greenfield development was identified as the growth area that required the most network upgrades, however an increase in storage was required for both greenfield development areas.

4. The existing network in Otamatea is at / near full capacity, and any additional growth in this area (infill or greenfield development) required network upgrades.

5. There was only a marginal difference in cost between the M12 gravity and M12 LPS options when considering growth from the Springvale and Otamatea greenfield development areas.

6. When considering the combined growth scenario, Otamatea still required additional network upgrades; no additional upgrades were required for the Springvale greenfield / Gonville area.

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 I 37 7. Recommendations

Following the growth related capacity investigation the following is recommended:

1. Once the outcomes of the M4 inflow investigations are known, the model be re-calibrated for this catchment and the updated model be used to modify / confirm and finalise the upgrades identified in this report.

2. The Liverpool Pump Station controls be adjusted and additional flow data be collected to re-calibrate the P8 catchment in the model. The updated model shall then be used to modify / confirm and finalise the upgrades identified in this report.

3. WDC develop a structure plan for the Otamatea greenfield development area to better estimate the network upgrade requirements.

4. While the M4 inflow investigations are being carried out and the Otamatea wastewater scheme confirmed, WDC commence works on the portions of the improvement plan that are not affected by the aforementioned areas. These include:

— Carrying out inflow reduction through Level 1 works for those catchments identified in the 2015 System Improvements Report — Carry out BRPS control optimisation — Physical upgrades in Areas I, J, 0, S and BB, which are independent of the City and Castlecliff Interceptors. 5. Once the model has been re-calibrated and the upgrades finalised following the M4 inflow investigations, WDC use the costs per dwelling as a guide only in assigning developer contributions.

38 I GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Appendices

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 Appendix A - Revised System improvements

1 in 1 Year Spill Areas for Existing Network

Area AA

Area BB

System Improvements with M12 Gravity Upgrades Cost Estimate

System Improvements with M12 LPS Upgrade Cost Estimate

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LEGEND Wanganui District Council Job Number 51-33557-00 Paper Size AS PIPE CAPACITY MANHOLES PREDICTED TO SPILL cE:ic ONSTRUCTED OVERFLOW OPERATES —Not Surcharged Wastewater System Performance Revision A 0 145 290 580 870 1,160 —Surcharged due tobackwatedng ossible Spill (0.1 to 20 rn.) Date 18 Mar 2016 —Surcharged due to insufficient capacity ePUMPSTAMON Metres M12 Gravity System Improvements ilfkloderate Spill 120 to 100 or') *FLOWMONITOR Map Projection: Transverse Mercator 1 Year Flow Event Horizontal Datum: New Zealand 1949 ilef_arge Spill (100 he Grid: NZGD 1949 Wanganui Circuit

GA51\ 3355700 \GIS \ Maps \ Working \ 513355700_M12 Gravity System Improvements_Base Model.mxd Level 2, 52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com © 2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created by:arbaugham

Optimise control philosophy 225 tom Liverpool St

Wanganui District Council Job Number 51-33557-00 Paper Size A3 LEGEND PIPE UPGRADES PIPE UPGRADES 1 in 1 YearExisting WW pipes 4111pumPsTATioN Wastewater Masterplan Revision A 0 2 4 8 12 16 ONew manhole Raise Overflow Weir Upgrade Upgrade Diameter WHANGANUI Date 21 Mar 2016 OMANHOLES New storage INNUpgrade and regrade • Upgrade and regrade —<250mm DISTRICT COUNCIL Metres ARemove Overflow Weir _ Downgrade Downgrade ■ 250 - 600 mm Te Kaunihera a Rohe o Whanganu. System Improvements - Area AA OSeal manhole ■ New bypass M New bypass OMP>600 mm Map Projection: Transverse Mercator OPump station improvementsfmRelay M Relay Horizontal Datum: New Zealand 1949 =Remove sedimenr M Remove sediment 1 Year Flow Event Grid: NZGD 1949 Wanganui Circuit \ 51\ 3355700 \GIS \ Maps \Working \ Common Upgrades \ 513355700_System Improvements - Issue AA.mxd Level 2,52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com © 2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy reliability. completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result a the map being inaccurate, incomplete or unsuitable in any may and for any reason. Data source- Data Custodian. Data Set Name/Title, Version/Date. Created by-arbaugham Remove Overflow Weir

LEGEND Wanganui District Council Job Number 51-3355700 Paper Size A3 Revision A New manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Wastewater Masterplan 0 3.5 7 14 21 28 O WHANGANUI Upgrade Date 31 Mar 2016 Diameter • MANHOLES I I New storage Upgrade and regrade DISTRICT COUNCIL Metres — <250mm System Improvements -Area BB gweDowngrade ■ 250 - 600 mm Te Kaunihera a Rohe o Whangante Seal manhole Map Projection: Transverse Mercator O mlNew bypass — >600 mm Horizontal Datum: New Zealand 1949 1 Year Flow Event Remove overflowlmRel ay Grid: NZGD 1949 Wanganui Circuit A miRemove sediment G:151 Q355700 \GIS Maps \Working \ Common Upgrades \513355700_System Improvements - Issue BB.mxd Level 2, 52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 646 353 1801 E [email protected] W www.ghd.com tt:I 2016. Whilst every care has been taken to prepare thN map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept Habifity and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created by:arbaugham Schedule of Quantities Wanganui District Council: Wastewater Masterplan Option 1: GHD 1 in 1Y with M12 gravity upgrades Prepared By/Checked By : ARBaugham I CJAnderson

DESCRIPTION UNIT QTY RATE AMOUNT TOTAL All costs allow for design, project management and professional fees, supply of materials, physical works and contract supervision/administration for the described works

Locate and Resolve Inflow Source Upstream of Nixon Street (M1) Investigation and medial works LS 1 $ 100,000 $ 100,000 Total M1 Point Inflow Reduction $ 100,000

Level 1111 Remedial Works - INFLOW REDUCTION Churton School Pump Station Catchment ha 47 $ 5,000 $ 235,000 Russell Street Pump Station Catchment ha 68 $ 5,000 $ 340,000 Anaua Pump Station Catchment ha 70 $ 5,000 $ 350,000 Beach Road City Catchment ha 210 $ 5,000 $ 1,050,000 M9 Catchment ha 105 $ 5,000 $ 525,000 M8 ha 32 $ 5,000 $ 160,000 M5 ha 18 $ 5,000 $ 90,000 M2 ha 128 $ 5,000 $ 640,000 Total I/1 Reduction $ 3,390,000

Beach Road Pump Station Controls Pump Station Upgrades Modify control system to optimise use of interceptor LS 1 $ 30,000 $ 30,000 Total Beach Road Modifications $ 30,000

Area A - Talbolt Street Pump Station Overflow Pump Station Upgrades Two new pumps with combined capacity of 101/s each 2 $ 15,000 $ 30,000 Installation and Misc. pipe and power upgrades at pump LS 1 $ 30,000 $ 30,000 station Total Area A $ 60,000

Area B - Spilling and Overflows on Wanganui East Interceptor Pipe Upgrades DN300mm Gravity Main m 75 $ 423 $ 32,000 DN450mm Gravity Main m 38 $ 480 $ 18,000 Storage Kowhai Park m3 1325 $ 1,500 $ 1,988,000 River Reserve, near Young Street Intersection rn3 82 $ 1,500 $ 122,000 Total Area B $ 2,160,000

Area C - Anzac Pump Station Overflow Storage Anzac Parade rn3 23 $ 1,500 $ 34,000 Pump Station Upgrades Two new pumps with combined capacity of 131/s each 2 $ 7,000 $ 14,000 Installation and Misc. pipe and power upgrades at pump LS 1 $ 25,000 $ 25,000 station Total Area C $ 73,000

Area D - Spilling on Anzac Parade, near Taylor Street Pipe Upgrades DN300mm Gravity Main m 269 $ 423 $ 114,000 Total Area D $ 114,000 Area E - Overflow Off Putiki Drive Modify Overflow Monitor overflow, check levels of associated houses and raise overflow weir if required (model shows 50 mm rise LS 1 $ 15,000 $ 15,000 required) Pipe Upgrades DN150mm Gravity Main m 3 $ 300 $ 1,000 DN225mm Gravity Main m 638 $ 360 $ 230,000 Total Area E $ 246,000

Area F - Overflow and Spill Upstream of Anaua Street Pump Station Pump Station Upgrades Two new pumps with combined capacity of 32 lis each 2 $ 8,000 $ 16,000 Installation and Misc. pipe and power upgrades at pump LS 1 $ 30,000 $ 30,000 station Total Area F $ 46,000

Area G - Spilling on Quick Avenue Pipe Upgrades DN300mm Gravity Main m 222 $ 423 $ 94,000 DN375mm Gravity Main m 182 $ 455 $ 83,000 Total Area G $ 177,000

Area H - Spilling and Overflow Upstream of Boyd Pump Station Storage River Reserve, near Brunswick Road m3 256 $ 1,500 $ 384,000 Total Area H $ 384,000

Area I - Spilling Top of Halswell Street Seal Manholes Seal Manholes each 1 $ 10,000 $ 10,000 Total Area I $ 10,000

Area J - Spilling in Peak Park Pipe Upgrades DN150mm Gravity Main m 24 $ 300 $ 7,000 Total Area J $ 7,000

Area K - Spilling near Virginia Lake Seal Manholes Seal Manholes each 3 $ 10,000 $ 30,000 Pipe Upgrades DN225mm Gravity Main m 206 $ 360 $ 74,000 Total Area K $ 104,000

Area L- Spilling in Central City Pipe Upgrades DN300mm Gravity Main m 123 $ 423 $ 52,000 DN375mm Gravity Main m 118 $ 455 $ 54,000 DN525mm Gravity Main m 453 $ 600 $ 272,000 DN675mm Gravity Main m 213 $ 680 $ 145,000 DN750mm Gravity Main m 612 $ 725 $ 444,000 Clean pipe m 57 $ 30 $ 2,000 Storage Laird Park m3 69 $ 1,500 $ 104,000 Moutoa Gardens rn3 1369 $ 1,500 $ 2,054,000 Total Area L $ 3,127,000

Area M - Spilling in Lower Carlton Avenue Pipe Upgrades DN375mm Gravity Main m 345 $ 525 $ 181,000 Total Area M $ 181,000

Area N - Spilling in Top of Wanganui East Nil - Model anomaly resolved Area 0 - Overflow at Plunket Street Pump Station Storage Near Pump Station m3 33 $ 1,500 $ 50,000 Total Area 0 $ 50,000

Area P - Overflow at Aramoho Park Pump Station Pump Station Upgrades Commission 2nd pump to get combined capacity of 51/s LS 1 $ 10,000 $ 10,000 Total Area P $ 10,000

Area Q - Spilling at Back of Properties in Fitzherbert Ave Pipe Upgrades DN225mm Gravity Main m 435 $ 360 $ 157,000 Total Area Q $ 157,000

Area R - Spilling on Smithfield Road Pipe Upgrades DN225mm Gravity Main m 400 $ 360 $ 144,000 DN300mm Gravity Main m 190 $ 423 $ 80,000 Total Area R $ 224,000

Area S - Spilling in Kings Avenue Area Pipe Upgrades DN300mm Gravity Main m 58 $ 423 $ 25,000 Total Area S $ 25,000

Area T - Spilling in Gonville Seal Manholes Seal Manholes each 1 $ 10,000 $ 10,000 Pipe Upgrades DN225mm Gravity Main m 175 $ 360 $ 63,000 DN300mm Gravity Main m 574 $ 423 $ 243,000 DN375mm Gravity Main m 240 $ 455 $ 109,000 DN450mnn Gravity Main m 749 $ 480 $ 360,000 DN525mm Gravity Main m 135 $ 600 $ 81,000 DN750mm Gravity Main m 222 $ 725 $ 161,000 DN825mm Gravity Main m 8 $ 750 $ 6,000 Clean pipe m 113 $ 30 $ 3,000 Storage Heads Road m3 255 $ 1,500 $ 383,000 Hinau Street m3 395 $ 1,500 $ 593,000 Total Area T $ 2,012,000

Area W - Spilling Off 5H3 Storage Bullocks Yard m3 184 $ 1,500 $ 276,000 Total Area W $ 276,000

Area AA - Liverpool Pump Station Cross Connection Pump Station Upgrades Modify control system to optimise use of upstream network LS 1 $ 15,000 $ 15,000 Total Area AA $ 15,000

TOTAL $ 13,083,000 Appendix D Common Upgrades

Area A

Areas C thru K

Area M

Area 0 thru S

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Wanganui District Council Job Number 51 -31 851-08 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 3.5 7 14 21 28 WHANGANU1 OSeal manhole PIPE UPGRADES Existing WW pipes • PUMPSTATION Date 17 Feb 2016 DISTRICT COUNCIL Metres mIDecomission pipe Diameter • Manholes Li New storage Ye Kaunihera a Rohe o Whanganui System Improvements -Area C =Remove sediment —<250mm Map Projection: Transverse Mercator Pump station improvements Upgrade Horizontal Datum: New Zealand 1949 ® —250 -600 mm Option 1 Grid: NZGD 1949 Wanganui Circuit ■ Upgrade and regrade ■>600 mm al51\ 3185108\ GIS1Maps \ Working \ Option 1 \ 513185108_Option 1 -Area C.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com © 2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy. reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created brarbaugham

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LEGEND Wanganui District Council Job Number 51-31851-05 Paper Size A3 °Seal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Wastewater Masterplan Revision A 0 5 10 20 30 40 IMIFlow split Diameter Date 06 Mar 2015 New storage • Manholes I I MIRegrade —<250mm Metres IMIRemove sediment System Improvements -Area D ® Pump station improvements .250 - 600 mm Map Projection: Transverse Mercator Upgrade mm Horizontal Datum: New Zealand 1949 Upgrade and regrade bola 1 Year Flow Event Ghd: NZGD 1949 Wanganui Circuit G. \ 51\ 3185107 \GIS Maps \Working \ System Improvements Plots \ 1 in 1 Year \ 1 in 1 Year Area D.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 646 353 1801 E [email protected] W www.ghd.com C 2015. Whilst every care has been taken to prepare this map, GHD and DATA CUSTODIAN) make no representations or warranties about its accuracy reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created by'arbaugham -wINWM07436

c.°I SWM05380 VVWM07427

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LEGEND Wanganui District Council Job Number 51-31851-05 Paper Size A3 Revision A OSeal manhole PIPE UPGRADES Existing WW pipes •PUMPSTATION Wastewater Masterplan 0 12.5 25 50 75 100 Date 06 Mar 2015 Sysimp Diameter • Manholes Li Newstorage Flow split —<250mm Metres MIRegrade ■250 -600 mm System Improvements -Area E ®Pump station improvements Map Projection: Transverse Mercator Remove sediment •>600 mm Horizontal Datum: New Zealand 1949 Upgrade W.14 1 Year Flow Event Raise Overflow Weir Seal man hole Grid: NZGD 1949 Wanganui Circuit A IMJpgrade and regrade G \ 51\ 3185107 \GIS Maps Working System Improvements Plots \ 1 in 1 Year11 in 1 Year Area E.mxd Level 2, 52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com 02015. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, rover otherwise) for any expenses losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created by arbaugham

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Wanganui District Council Job Number 51 -31 851-05 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 5 10 20 30 40 0Seal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Date 06 Mar 2015 IMIHow split Diameter Metres New storage • Manholes egrade —<250mm System Improvements -Area F =Remove sediment ■ Map Projection: Transverse Mercator ®Pump station improvements 250 - 600 mm Horizontal Datum: New Zealand 1949 Upgrade mm 1 Year Flow Event Grid: NZGD 1949 Wanganui Circuit =Upgrade and regrade G:\51\ 3185107 \ GIS \ Maps \ Worldng System Improvements Pbts \ 1 in 1 YearVI in 1 Year Area F.mxd Level 2, 52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 646 353 1801 E [email protected] W www.ghd.com ©2015. Whilst every care has been taken to prepare this map, GHD and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created by:arbaugham 1111(0/- Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND 'e* Wastewater Masterplan Revision A 0 10 20 40 60 80 OSeal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Wig Date 06 Mar 2015 =Plow split Diameter • Manholes Metres _New storage System Improvements -Area G IMIRegrade —<250mm Map Projection: Transverse Mercator IMRemove sediment 260 - gPump station improvements 600 mm bold 1 Year Flow Event Horizontal Datum: New Zealand 1949 Upgrade •0600 mm re Grid: NZGD 1949 Wanganui Circuit Upgrade and regrade

GA51 \ 3185107 \ GIS Maps \ Working \ System Improvements Plots \ 1 in 1 Year/1 in 1 Year Area G.mxd Level 2, 52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com

© 2015. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitabihty for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract. tort or otherwise) for any expenses losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created byairbaugham / N VVVVM05149

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INWM 03343 VVWM03350

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Job Number 51-33557-00 LEGEND Wanganui District Council Paper Size A3 Revision A PIPE UPGRADES 1 in 1 YearExisting WW pipes Opumps Wastewater Masterplan 0 5 10 20 30 40 ONew manhole -rA-rioN WHANGANUI Upgrade Diameter Date 24 Mar 2016 • MANHOLES ENew storage • UUpgra de and regrade —<250mm DISTRICT COUNCIL Metres Downgrade .....■256 0c; a0m m0 mm Te Kaunihera a Rohe o Whanganu. System Improvements -Area H 0Seal manhole :I laybypass Map Projection: Transverse Mercator Relay 1 Year Flow Event Horizontal Datum: New Zealand 1949 • Remove sediment Ghd: NZGD 1949 Wanganui Circuit

\ 51 \ 335570CAGIS \ Maps \Working \Common Upgrades \513355700_Systern Improvements - Issue H.inxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 646 353 1801 E [email protected] W www.ghd.com ©2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source. Data Custodian, Data Set Name/Title, Version/Date. Created by arbaugham 4WWM03042

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VVWM03047 INWF0003A • VVWF0003 • Ha!swellN St

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Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 5 10 20 30 40 OSeal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Date 06 Mar 2015 4111•Flow split Diameter • Manholes storage Metres ENew =Raise overflow weir —<250mm System Improvements -Area I =Remove sediment ■ Map Projection: Transverse Mercator OPump station improvements 250 -600 mm Horizontal Datum: New Zealand 1949 Upgrade • >600 mm 6 Month Flow Event Grid: NZGD 1949 Wanganui Circuit a151131851071GIS \ Maps1Working System Improvements Plots \ 1 ink MonthVI in 6 Month Area I.mxd Level 2,52 The Square, Palmerston North, 4410 T 646 353 1800 F 646 353 1801 E [email protected] W www.ghd.com © 2015. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy. reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created byiarbaugham 0

WWM03200 INWM08268

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Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND lOeee. y Wastewater Masterplan Revision A 10 15 20 0 2.5 5 °Seal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION P•M Date 06 Mar 2015 I=Flow split Diameter • Manholes Metres LNew storage =Raise overflow weir —e250mm System Improvements -Area J MRemove sediment ■ Map Projection: Transverse Mercator gPump station improvements i250 -600 mm Horizontal Datum: New Zealand 1949 Upgrade i■*0600 mm 6 Month Flow Event Grid: NZGD 1949 Wanganui Circuit G. \ 51 \ 3165107 \ GIS1Maps \Working \ System Improvements Plots \ 1 in 6 Month \ 1 in 6 Month Area J.mxd Level 2,52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com © 2015. Whilst every care has been taken to prepare this map, GHD land DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses losses. damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian. Data Set Name/Title, Version/Date. Created by arbaugham VVVVM02971 VVVVM02967,

Seal MH vvwm08965

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Wanganui District Council Job Number 51-31851-05 Paper Size A3 ty(04, LEGEND Wastewater Masterplan Revision A 0 10 20 40 60 80 °Seal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION PPM Date 06 Mar 2015 ■ =1Flow split Diameter S Manholes Metres 1New storage System Improvements Area K egrade — <250mm Map Projection: Transverse Mercator =IRemove sediment ■ 250 -600 mm O Pump station improvements boa 1 Year Flow Event Horizontal Datum: New Zealand 1949 Upgrade ■ >600 mm Grid: NZGD 1949 Wanganui Circuit Upgrade and regrade \ 51 \ 3185107 \ GIS \ Maps Working \System Improvements PlotsVI in 1 YearVI in 'I Year Area K.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 646 353 1801 E [email protected] W www.ghd.com ©2015. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, toit or otherwise) for any expenses losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source' Data Custodian. Data Set Name/Title, Version/Date. Created by arbaugham VVVVM02018 VVVVM02023 VVVVM01783

VVINM09358 WWM 09442 VVVVM01794 Ilr-VVVVM01989 VVVVM02022 225 mm 225 mm _,VVWM01793 • a WWM01792 VVVVM09441

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Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 12.5 25 50 75 100 °Seal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Wig Date 06 Mar 2015 P =ow split Diameter • Manholes Metres New storage System Improvements -Area M IIMIR egrade —<250mm Map Projection: Transverse Mercator IIMIR emove sediment ■ O Pump station improvements 250 -600 mm bola 1 Year Flow Event Horizontal Datum: New Zealand 1949 Upgrade ■ >600 mm Grid: NZGD 1949 Wanganui Circuit Upgrade and regrade \ 51 \ 3185107 \GIS \ Maps \Working System Improvements Plots VI in 1 YearVI in 1 Year Area M.mxd Level 2, 52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2015. Whilst every care has been taken to prepare this map, GI-ID (and DATA CUSTODIAN) make no representations or warranties about its accuracy reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source- Data Custodian, Data Set Name/Title, Version/Date. Created by arbaugham INWM09371

150 SWM07302

150 mm

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Wanganui District Council Job Number 51-33557-00 Paper Size A3 LEGEND PIPE UPGRADES 1 in 1 YearExisting WW pipes Wastewater Masterplan Revision A 0 2.5 5 10 15 20 ONew manhole OPUMPSTATION WHANGANUI Upgrade Diameter Date 24 Mar 2016 • MANHOLES New storage •Upgrade and regrade —<250mm DISTRICT COUNCIL Metres • Downgrade ■ i 250 -600 mm Te Kaunihera a Rohe o Whanganu: System Improvements -Area 0 New bypass 1M.600 mm Map Projection: Transverse Mercator Weal manhole. • Relay 1 Year Flow Event Horizontal Datum: New Zealand 1949 • Remove sediment Grid: NZGD 1949 Wanganui Circuit a \ 51 \ 3355700 \GIS\ Maps \ Working \ Common Upgrades\ 513355700_System Improvements - Issue 0.mxd Level 2, 52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com e2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, lover otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created by:arbaugham VVWM03592 VVYVM03611 150 rn(71 VVVVM05618

VVVVM03620

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WVVM05173 150 mm VVVVM05614 150 Mill

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Wanganui District Council Job Number 51-31851-05 Paper Size A3 $airOpee. LEGEND Wastewater Masterplan Revision A 0 5 10 20 30 40 OSeal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Date 06 Mar 2015 =Flow split Diameter Manholes Metres storage • System Improvements -Area P P1 New 4=Regrade — <250mm Map Projection: Transverse Mercator ■ (g)Pump station improvements =Remove sediment i i250 -600 mm 1 Year Flow Event Horizontal Datum: New Zealand 1949 Upgrade • >600 mm Grid: NZGD 1949 Wanganui Circuit =Upgrade and regrade GA5113185107\ GIS\ Maps\ Working \System Improvements Plots \ 1 in 1 YearVI in 1 Year Area P.mxd Level 2,52 The Square, Palmerston North, 4410 T 646 353 1800 F 646 353 1801 E [email protected] W www.ghd.com 2015. Whilst every care has been taken to prepare this map, GHD and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created brarbaugham

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VVVVM01855 INWM09405 INWM01858

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VVVVM01727 VVVVM01853 150 mcn VVVVM09406 150 pin, VVVVM 09400 WVVM 09401 150 rnm VVVVM07692 VVVVM09399 VVVVM 09544 150 mm

VVVVM01743

Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND 0 10 20 40 60 80 Wastewater Masterplan Revision A OSeal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION Date 06 Mar 2015 IMIFlow split Diameter • Manholes Metres DNew storage System Improvements Area Q MegradeR —<250mm Map Projection: Transverse Mercator =Remove sediment OPump station improvements 250 - 600 mm 1 Year Flow Event Horizontal Datum: New Zealand 1949 Upgrade ■>600 mm Grid: NZGD 1949 Wanganui Circuit Upgrade and regrade \ 51 \ 3185107 \ GIS \ Maps \Working \ System Improvements Plots \ 1 in 1 Year VI in 1 Year Area 0.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2015. Whilst every care has been taken to prepare this map, 01-10 (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability. completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract. tart or otherwise) for any expenses losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created by arbaugham VVVVM 07842 WVVM01743

VVVVM09521 VVVVM02073 WVVM09522 7 ,5•0 WVVM09396

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Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 10 20 40 60 80 EDSealmanhole PIPE UPGRADES Existing WW pipes OPUMPSTATION P•M Date 06 Mar 2015 MFlow split Diameter • Manholes Metres Newstorage System Improvements -Area R Li MRegrade —<250mm Map Projection: Transverse Mercator station improvements MRemove sediment , 250 - 600 mm boa 1 Year Flow Event Horizontal Datum: New Zealand 1949 ®Pump Upgrade mm Grid: NZGD 1949 Wanganui Circuit Upgrade and regrade GA51 \ 3185107 \GIS \ Maps \Working \System Improvements Plotstl in 1 Year \ 1 in 1 Year Area R.mxd Level 252 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2015. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being Inaccurate Incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created by arbaugham

Wanganui District Council Job Number 51-31851-05 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 5 10 20 30 40 OSeal manhole PIPE UPGRADES Existing WW pipes OPUMPSTATION P•M Date 06 Mar 2015 Diameter • Manholes Metres storage System Improvements -Area S riNew GMIRegrade —<250mm Map Projection: Transverse Mercator MRemove sediment ■ ®Pump station improvements 1=Flow split 250 -600 mm 1 Year Flow Event Horizontal Datum: New Zealand 1949 Upgrade mm Grid: NZGD 1949 Wanganui Circuit Upgrade and regrade G151 31851071GIS Maps Working System Improvements Plots \ 1 in 1 Year11 in 1 Year Area S.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2015. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian. Data Set Name/Title, Version/Date. Created by'arbaugham Appendix F - Combined Growth Upgrades

Area B

Area L

Area T

Area W

G-1

G-3 G-4

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00 T30

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INVVM00461 150 r°11 we.IVVM00454 315111°1 49:11."1":1 Q5s WVVM00449 Upgcad?- -911ra11.,,u403 xong 22 VVVVM00462 cc. WWM00452 150 mm VVVVM00392 VVVVM00451 VVWM00466 VVVVM00467 • #rVVVVM00464 •

INVVM00484 Aso 11'1 1)7 VVWM004 T,2 `''" 50 OA ,.,,,3-1961

LEGEND Wanganui District Council Job Number 51-33557-00 Paper Size A3 ONew manhole PIPE UPGRADES PIPE UPGRADES 1 in 1 Year Existing WW pipes Existing WW pipes OpumpsTA-rioN Wastewater Masterplan Revision A 0 10 20 40 60 80 Upgrade Upgrade Diameter Diameter WHANGANUI 21 Mar 2016 • MANHOLES Date DNew storage •1111Regrade • Upgrade and regrade —,250mm —<250mm DISTRICT COUNCIL Metres ImlUpgrade and regrade Downgrade ■ ■ 250 - 600 mm 250 - 600 mm Te Kaunihera a Rohe o Whanganui Combined Growth 0Seal manhole.RDoewngrade • New bypass ■ >600 mm ■>600 mm Map Projection: Transverse Mercator New bypass • Relay System Improvements -Area G-1 Horizontal Datum: New Zealand 1949 Relay • Remove sediment Grid: NZGD 1949 Wanganui Circuit ■ iRemove sediment G. \ 51 \ 3355700 \GIS \ Maps \Working \Combined Growth \513355700_Combined Growth_System Improvements - Issue G-1.mxd Level 2,52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2016. Whilst every care has been taken to prepare this may. GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, redo) otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created by-arbaugham VVVVM10655 VVWM04422 VVVVM10664 WVVM04376 VVVVM04423

INVVM04404 WVVM10662 15 VVVVM10663 cks WVVM-04380 WWM04424

0 WWM10661 (7 'h 0) VVVVM10660 CY VVVVM04416 0•'D V c)6` VVVVM04405 VVVVM10652 WVVM04406

VINVM04407 E CI) 1,50 VVIN11121)-08 VVVVM04431 wwm4E32 VVWM10651 VVVVM04433 aelttOi w ill INVVM04432 150 aim VVVVM04434 150 rnni VVVVM04435 /50 inn) VVVVM04463 1/f • roMja to WWM07601 150 rnm''''j 'i WWM04437

7 WWM04464 0 VVVVM04438 VVWM04465

1NVVM04439 VVVVM04470

WVVM04468 150 mm WWM04461 150

tifirginia WVVM04466 VV1NM04467 VVVVM04471

WWM04472

VVVVM04473 VVWM04474 150 mm Upgrade225 mm pipe, VVVVM04462 195 m long VVVVM05677 7,5,0

WWM04342 VVVVM10520

150 mm VVVVM07004 VVVVM 043411r: 1

Wanganui District Council Job Number 51-33557-00 Paper Size A3 LEGEND PIPE UPGRADES PIPE UPGRADES 1 in 1 Year Existing VVW pipes Wastewater Masterplan Revision A o 12.5 25 50 75 100 ONew manhole OPUMPSTAT1ON WHANGANUI Upgrade Upgrade Diameter Date 21 Mar 2016 • MANHOLES New storage 'MUpgrade and regrade • Upgrade and regrade —<250mm DISTRICT COUNCIL Metres E 7.7:Downgrade :I, Downgrade • 250 -600 rem Te Kaunihera a Rohe o Whanganu, Combined Growth ■ )Seal manhole=elay • New bypass >600 mm Map Projection: Transverse Mercator C. wbypass • Relay System Improvements -Area G-3 Horizontal Datum: New Zealand 1949 I=Remove sediment • Remove sediment Grid: NZGD 1949 Wanganui Circuit

\ 51 \ 3355700 \GIS \ Maps \Working \Combined Growth \513355700_Combined Growth_System Improvements - Issue G-3.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian. Data Set Name/Title. Version/Date. Created byarbaugham • e

rINWM0.447,8 VVVVM 04346 4 VVVVM03039.N11 VVVVM 04479 47VVVV M00342 4-9 WVVM00654 VVWM 04347 \ VVVVM03062 WWM03038 VVWM03041 WVVM 02967 INVVM01608 MIA11111110A CO WVVM07710 VVWM 04348 WVVM01609 ts. VVVVM 04351 WVVM08965 VVVVM02996 • VVVV M04257 VVVVM03198 VVVVM01983 WVV Ms:irC-354 ,VVVVM04480 IA/WM 08966 WWM07547i. VVVVM 04353 VWM0 Qg VVVVM02984 VVVV:41029 i)v111/M 05011 IANvm08967 WWM02.—jr. • , VVVVM04365 VVVVM 04481 p =VVVM03111 4'7;9) VVVVM02972 WVVM05358 cif '!:10,,41A/M04357 WVVM08968 VVVVM02986 VVV21/104161 VVVVM01183 INVVM08969 INVVM02987 CO, VVVVM05071 VVVVM 05053 Great North Rood VVVVM 10516 VVVVM01184 VVVVM 04356 VVVVM02974 INVVM030',.; 150 VVVVM 02988 VV1NM 04355 WWM10515 VVVVM 07924 VVVVM03003 VVVVM01185 WVVM03002 g.1/VVM02845 W1NM07922 WVVM01186 WVVM02853 VVVVM07923 :SIVVM02846 VVVVM 02847 VVVVM08089 VVVVM01187 INVVM08702 vvVVm02992 (.4 VVVVM 03004 WVVM02854 INWM02855 AZ'7 VVVVM 04480 VVVVM 02849 VVVVM08699 VVVVM01188 VVVVM02848 VVVVM02866 INVV M02878 INVVM04364 VVVVM02879 VVVVM02850 VVVVM02995 WVVM02881 Caversh ,tirn Road VVVVM01189 WWM 02880 VVWM02867

WWM01112 150 mm VVVVM01090 ND NDds VVVVM01039 INVVM05657 VVVVM02910 VVVVM01241 VVWM01094 VVVVM02829 WVVM02916 VVWM01230 INVVM01038 VVVVM01113 VVVVM02827 \ INVVM01040\ VVVVM05571 VVM01229 VVVVMO 2826 VVVVMO 5656 WW M01226 VVVVM02917 Fc> VVVVM 05658 VVVVM01117 ">?0,WVVM01041 WW M00345 VVVVM02825 40 VVWM 00343 INVVM01227 INVVM01101 • VVVVM02824 VVVVM02, VVWM01115 VVVVM02919 ,.'e0111W M 01044 WI1VM01234 VVVVM01235 VVVVM01105 VVVVM01042 7 WWM01099 6'0 1NVV:. M01097 VVVVM01237 WVVM02817 VVVVM 01046 4,AANM03642 WVVM02923 VVVVM 02820 VVWM01049 VVVVM 02922 VVVVM02819 VVVVM08972 VVVVM00955 VVVVM01100' WWM02391 ; WVVM01050 INVVM 04549 VVVVM02821 VVVVF , INVVM01106 VVVVM 0104(ce VVVVM02921 VVVVM02389 VVWM01101 VVVVM01105 0 VVVVM01239 INWM01109 op" N4, C) INWril;61 052 WVVM01107 VVVVM02920 WVVM02388 ZPoo VVWM 00958 VVVVM01054 VVVVM01131 VVVVM01059 VVVVM09233 WV INVVM01056\ \ \_\ VVVVM01133 WWM02492 NEL/

Wanganui District Council Job Number 51 -33 557-00 Paper Size A3 LEGEND Wastewater Masterplan Revision A 0 25 50 100 150 200 ONew manhole PIPE UPGRADES PIPE UPGRADES 1 in 1 Year Existing WW pipes OPUMPSTATION WHANGANUI Date 21 Mar 2016 Upgrade Upgrade Diameter ■ MANHOLES DISTRICT COUNCIL Metres I I New storage 1.1 and regrade M UUppggrrade and regrade —<250mm Combined Growth 'Downgrade . RDo elawnygrade ■ .250 - 600 mm Te Kaunihera a Rohe o Whanganu. Map Projection: Transverse Mercator OSeal manholermNew bypass 0 New bypass m•>600 mm Horizontal Datum: New Zealand 1949 Relayft System Improvements -Area G-4 Gdd: NZGD 1949 Wanganui Circuit MODRemove sediment IN Remove sediment

G.151133557001GIS \ Maps \Working Combined Growth1513355700_Cambined Growth_System Improvements - Issue G-4.mxd Level 2, 52 The Square, Palmerston North, 441 0 T 64 6 353 1 800 F 64 6 353 1 801 E [email protected] W www.ghd.com © 2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses. losses. damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result af the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title. Version/Date. Created by'arbaugham -

Kitehener St INWM 03979 VVVVM04854 -o VVWM03976 150 mm C 0 1711- V.1 0 48,50 s"Ori,2.5 WINM04270 , 173 7:1 177 WWM04003 VVWM03974 )17 r VVWM053/9 INWM04851 7s0 WWM03999 SWiV1.64291 VVVVM05316 • WWM05378 INWM04077 INWM03997 ILES04849 VVWM 04750 VVWM03969 WWM04849 „,.-.,WM03971 INWM 03968 VVWM03887 7FRussel Si*rWW'' M04846 e/4 VVWM03868 VVWM03888 VVWM03869 VVWM0388&- WWM0ago VVWM05088 VVWM03871 WWM0389 VVWM 05317 e,k,e io'VWM03892 Upgrade storage from 82m3 to 85m3 VVWM 04844 /74'.- 1.02m deep VVINM05214 rIM 03859 "-...k. WWM03891 ES0484I,Storage INWM04247.,.? VVWM03867 WWM05550 VVWM04248 u VVWM07592 WWM03886 0-) VVWM0385,8 VVVVM03885 VVWM042491 r. VVWM05005 e2s ‘a: VVVVM03902 INWM07591 VVWM03884 VVWM03883 • WVVM04250 VVWM03893 VVINM0391f*- WWM0388 225 mm LZ VVWM03882 INWM056, www03831 VVWM03830 VVWM .vvvvM04 287 VVWM03915 ""'"'171. ackett-St WWM03829 VVWM03881 VVVVM 04243 WWM05556 VVWM03913 IINVVM04839 VVWF0002 VVVVM 03828 WWM038 WVVM05006 VVVVM03904 WVVM03839 u, VVWM07587 225 mm VVVVM03793 VVVVM 04240 VVWM04238 VVVVM05606 VVWM05607 i . 225 mm 300 min I VVWM05549 i Id Strve‘PM03814 INWM03795 ANWM04840 WWM03940 30(Watief WWM°552U1Bpgrvvvvadems5t5o2rlage from7',1%25m3 to 1336m3 VVWM04239 VVWM03797 'IP VVVVM04237 WWM04241 VVWM03799 VVWM03947 b'VVVM03810 ES05521, "IP9- rl ."— Storage 1.94M deep VVVVM 04236 .486, ,...,, VVWM04841 VVWM 03945\4 WWM03826 VVWM03800 ,ijIA/M03809 38 pi WWM03704 117 1017, : Pm' 0""b 311NM03808 'Pe VVWM03785 VVWM04836 VVVVM07679 •-50 VW ti2 7 WWM03807 VVWM03706 VVWM 03822 VVWM03707 VVWM04833 SWM04569 INWM03955 VVVVM04831 VVWM03711

VVWM 03956 INWM05122 WVVM03728 VVVVM03714 VVWM05564 WWM039F1 VVWM 03715 WVVM05121 :Salk WWM03716 VWVM047(28 ES0551 VVWM03778 "(WM 03747

VVWM05527 VVWM03781 WWM03717 VVWM04727 VVWM07115 VVWM03783 INWM08428 Raine St INWM03774 INWM08429 INWM07114 VVWM 03784 VVW1V144,745 .:..wm03773 INVVM 08424 ' VVWM08426 VVWM03721 VVWM07113 WWM03758 VVVVM02588 7 1 VVWM037721 WWM08512 0 VVWM04725 ■4_4r. WVVM08437 VVWM08440 INVVM08446 ett, VVVVM07112 VVWM04724 INWM03696 VVVVM08439 VVINM07933 WWM07111 VVWM08004 VVWM10556 INWM04 WWM03701 WWM07096 WWM025% WWM03695 VVVVM07939 VVVVM07937 VVWM03700 VVWM07092 WWMuiwis0472 2 VVVVM 03692 WWM03699 VVWM07052 VVVVM04721 WWM07078 VVWM0707 VVVVM 07.071(10 WVVM0705,

LEGEND Wanganui District Council Job Number 51-33557-00 Paper Size A3 PIPE UPGRADES PIPE UPGRADES 1 in 1 YearExisting VVW pipes Wastewater Masterplan Revision A 37.5 75 150 225 300 ONew manhole OPUMRSTATION Upgrade Upgrade Diameter WHANGANU1 Date 21 Mar 2016 • MANHOLES New storage =IUpgrade and regrade • Upgrade and regrade —<250mm DISTRICT COUNCIL Metres Downgrade Downgrade ■ 250 - 600 mrn Combined Growth ■ Te Kaunihera a Rohe o Whanganu, Seal manhole ew bypass III New bypass >600 mm Map Projection: Transverse Mercator O Relay IB Relay Horizontal Datum: New Zealand 1949 1=IRemove sediment • Remove sediment System Improvements -Area B Grid: NZGD 1949 Wanganui Circuit • Decomission a151133557001GIS1Maps\Working Cornbtned Growth \513355700_Comblned Growth_System Improvements - Issue Brood Level 2, 52 The Square, Palmerston North, 441 0 T 64 6 353 1 800 F 64 6 353 1 801 E [email protected] W www.ghd.com ©2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representaLons or war antles about its accuracy. reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses. losses damages and/or costs (including indirect or consequent.' damage) which are or may be incurred by any party as a result of the map being inaccurate. incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created by arbaugham

WWM02438 WVVM04731 VVVVM02690 se WVVM04831 VVINM05602 VVVVM02455 VVVVM04832 WVVM02909 '22 VVVVM03954 VVVVM02936 VVWM05122 WVVM04730 VINVM.07914 VVWNI055...f. wWM03956 if> VVVVM 02451 WVVM02445 o-c: cs 0 0 ) 6" ,,,SC e , ? WVVM0240 col . WVVM04729 INWM03957 „ G - '?) VVVVM05121 VVVVM02449 c.o, VVVVM05044 lic3-.0.5141-133779,"WINWM03777 VVVVM02910 INVVM03959 \x's 0 WVVM 02444 INWM02652 ("IP_ 94521 ,„,"Q WINM02452 VVVVM02460 WWM 04728 VVVVM03764 VVVVM02424 •C`.- ...... 0 140_460 VVVVM03780 INVVM02463 WVVM03779 ' #$9 :6' er, VVI.4arb351177/71 VVVVM04228 (13s fr 0 Si)) *5% 0 /prig IgipoVVVVMO 3782 WWM02419 1 • 4/ *Ill VVVVM03768 INVVM02540 '27 VVVVM03781 WVVM03766 .9;" • WVVM02425 ,,b IS) 0,v • ti,.>„ ir,. VVVVM05631 WVVM03783 VVVVM0250-,> .5' • ■ Novetivon 08623 VVVVM05310 o WINM 08428 VVVVM02919 •SQ /2., VVWM03774 VVVVM03745 /22/o --,), r v..gziiv108667 INWM037rd. INVVM02422 .t.),, /?0,,"41■14:2,6 VVVVM08867 VVVVM03757 WVVM02541 4.."'" 1",(.Q .....• VVWM08648 LS\ VVVVM08424 WINM08426 VVVVM02817 INVVM02421 WVVM04726 INWM03773 ('F' i'6' •`-'0 `sx VVWM P"e3 WVVM02923 WVVM02500 , p .... it .,• --X , silte WVVM02820 . n, ,cs. vi7 s • o WWM02588 tr taw ts, VVWM084W' lVVM08435 WVVM02922 WWM02819 INVVM08972 If, VVWMC-37* -5.- coo WWM10673 elY (V VVVV11.416vve s.,• 45, ■ • p. VVVVM08437 WWM02391 INVVM02402 WVVM02545 INVVM 04725 4:1) ' / ir, Wil , WVVM02590 VVVVM08421 ••• VVVVM05621-A1 Ail- • '1,' VVVVM02389 INVVM02403 ,9'cs !OE, • 6',,, VVVVM02568 s-k VVINM10674 $* *.,/,.. • „;9), -7, VVVVM05227+, '‘5 VVVVM07943 INVVM02390 INVVM02530 o c3c), VVVVM036417%; sve VVVVM05663 VVVVM02388 n oe ... INWM03702-0 VVVVM02531 WVVM08004 VVVV0.7,16'; • WWM0370111 VVVVM02484 WNM056..1)120 VVVVM 04723 INWM10512 VVVVM02410 VVVVM02596 VVVVM03695 WWM07941 VVVVM02597 WWM0370q 0-cs VVWM09234 WVVM05202 VVWM02381 VVVVM04557 WWM04722 VVVVM03699 0 WVVM09231 VVVVM05561 I ?AD INVVM02379 WWM 04721 VVVVM03692 c,t.) WWM02380 WWM02386 `10 VVINM01154 VVVVM 08928 VVVVM09110 VVVVM02553 01 VVVVM05120 INVVM07080 f2.16exini), WVVM05608 IIP VVVVM02552 •-• 0\ SVVFS 1 AnzacIF),de7083 VVVVM04720 WVVM 02547 WVVM02575 WWM02581 WW F(8 \ VVVVM02584 to s /M08584 WWM02550 S WWM02609 VVVVM02571 VVVVM02580 S. vvvvm 6%15 WWM02524 WWM02501 VVINM02521 VVVVM02604 Storage 69m3 VVVVM05211 VVVVM02649 2.37m deep VVVVM02570 VVVVM04556 VVVVM02644. VVINM02599 WWM02428 VVVVM02520 VVVVM08902 VVVVM09299 VVVVM 02248 WWM02645 VVVVM08911 VVVVM07076 VVVVM02606 'cic)6. WIN M 07715 Oc:d VVVVM 02643 M02516 WVVM07716 VVVVM07077 . VVVVM02601 WVVM02376 2505 '1, y1/W M02515 VVVVM 08707 s<2 VVVVM04716 6Z, VVVVM02375 M02161 WVVM02252 VVVVM02270 VVWM0701,„g d tlio? VVVVM05555 INVVM 04715 '22 VVVVM02740 (?-1 VINV M 02631:P0-c:1 VVVVM02642VVVVM08105 WWM 0 ae IAANM025144, VVINM02257 0 INWM02277 oki ININM09064 ,As VVIN M02351 VVVVM04714 INWM05324 VVWM07035 VVVVM07849 WV.c, -,95553 VVVVM LA5..003 0‘41v WV 2278 WVVM02640 VVVVM02352 VVVVM02429 ze. 6/VVM04713 WVVM 07433 VVVVM02,0 VVVVIVcia2285 VVVVM02353 02271 VVVVM07987 WWM07985 = INVVM09058 Uparade storage from 1369m3 to 1483m3 WINM02513 04, VVVVM02289 WWM 02354 VVVIP2272 a Storage 3.4a deep VV't: 1V1021820 WW M0M2706;2<1-27 /21,6.0 c.<<,,VVVVM07848 k/M02290 c3=ININM0233:,, VVVVM04712 WWM05322 y 6, VVVVM02266 VVVVM02321 VVVVM09057 4 VVVVI.:V8083 INVVM02283 WVVM04711 VVWM07508 6 9096VVVVM090951. co VVVVM04710 MOM9°0971 "WWM09090 IVVVVM0455-114N.VVVVM )11WVVM021841111:;NINVVM02217 WVVM023%. WWM02330 I

LEGEND Wanganui District Council Job Number 51-33557-00 Paper Size A3 °New manhole PIPE UPGRADES PIPE UPGRADES 1 in 1 YearExisting WW pipes OPUMPSTATION Wastewater Masterplan Revision A 0 25 50 100 150 200 Upgrade Upgrade Diameter WHANGANUI Date 21 Mar 2016 storage alliJpgrade and regrade • Upgrade and regrade MANHOLES nNew —.250mm DISTRICT COUNCIL Metres 6r•Downgrade UU Downgrade •250 - 600 mm Te (aunihera a Rohe o Whanganu. Combined Growth OSeal manholeMlblew bypass • New bypass 600 mm Map Projection: Transverse Mercator ■ Relay • Relay Horizontal Datum: New Zealand 1949 System Improvements -Area L Remove sediment ▪ Remove sediment Grid: NZGD 1949 Wanganui Circuit • Decomission

G \ 51\3355700 \GIS \ Maps Working \ Combined Growthl513355700_Combined Growth_System Improvements - Issue L.mxd Level 2, 52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy. reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses. losses. damages and/a r costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being in incomplete or unsuitable in any way and for any reason. Data source. Data Custodian, Data Set Name/Title, Version/Date. Created by a rbaugham

0 50 ,ent3m

6.1 1,50 tritri

A50

825 mm g M ITI R., eieallsii,-31MkOfopipe

--%-")cirade sarage-from 255m3 to 287m3 Storage 2:28m deep "O oi■>) '??* 552 9

-o 300 mni 't-P,krol■

Wanganui District Council Job Number 51-33557-00 Paper Size A3 LEGEND PIPE UPGRADES PIPE UPGRADES 1 in 1 Year Existing WW pipes OpumPSTATION Wastewater Masterplan Revision A 0 15 30 60 90 120 °New manhole WHANGANUI Upgrade Upgrade Diameter Date 21 Mar 2016 • MANHOLES ElNew storage IIINIJpgrade and regrade NI Upgrade and regrade —<250mm DISTRICT COUNCIL Metres 11:Downgrade Downgrade =650c; Te Kaunihera a Rohe o Whanganut Combined Growth eewiaybypass New bypass OSeal manhole= mm Map Projection: Transverse Mercator • Relay System Improvements - Area T Horizontal Datum: New Zealand 1949 =IR emove sediment • Remove sediment Grid: NZGD 1949 Wanganui Circuit GA51\ 3355700 \ GIS \ Maps \ Working \ Combined Growth \513355700_Combined Growth_System Improvements - Issue T.mxd Level 2, 52 The Square, Palmerston North, 4410 T 646 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com ©2016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract. tort or otherwise) for any expenses losses damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate, incomplete or unsuitable in any way and for any reason. Data source Data Custodian, Data Set Name/Title, Version/Date. Created by'arbaugham NM01995 WWM04693 cc\ c/ VVWM01996 VVWM01821

WWM09236

VVWM05270

NG3Q'

0-`

INVVM01998

INWM02001 • VVWM05267

Upgrade storage from 184m3 to 197m3 Storage 2.87m deep

WWM04690

Wanganui District Council Job Number 51-33557-00 Paper Size A3 LEGEND Revision A PIPE UPGRADES 1 in 1 YearExisting WW pipes Wastewater Masterplan 0 5 10 20 30 40 ONew manhole PIPE UPGRADES OPUMPSTATION WHANGANUI Upgrade Upgrade Diameter Date 21 Mar 2016 • MANHOLES • Upgrade and regrade Metres FiNew storage MoUpgrade and regrade —<250mm DISTRICT COUNCIL i:Downgrade • Downgrade ■ 250 - 600 mm Te Kaunihera a Rohe o Whanganu, Combined Growth Map Projection: Transverse Mercator OSeal manhole11•11:Reewlaybypass • New bypass ■ >600 mm Horizontal Datum: New Zealand 1949 • Relay System Improvements -Area W Grid: NZGD 1949 Wanganui Circuit MRemove sediment • Remove sediment

G: \ 51\ 3355700 \ GIS \ MapsWorking Combined Growth \513355700_Combined Growth_System Improvements - Issue W.mxd Level 2,52 The Square, Palmerston North, 4410 T 64 6 353 1800 F 64 6 353 1801 E [email protected] W www.ghd.com 02016. Whilst every care has been taken to prepare this map, GHD (and DATA CUSTODIAN) make no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and cannot accept liability and responsibility of any kind (whether in contract, tort or otherwise) for any expenses, losses, damages and/or costs (including indirect or consequential damage) which are or may be incurred by any party as a result of the map being inaccurate. incomplete or unsuitable in any way and for any reason. Data source: Data Custodian, Data Set Name/Title, Version/Date. Created by:arbaugham Appendix H Combined Growth Cost Estimate

Combined Growth with M12 Gravity System Improvements

GHD I Report for Whanganui District Council - Whanganui City-Wide Growth, 51/33557/00

Schedule of Quantities Wanganui District Council: Wastewater Masterplan /MR Combined Growth Scenario GHD w/ M12 Gravity SI imia Prepared By/Checked By : ARBaugham / CJAnderson

Locate and Resolve Inflow Source Upstream of Nixon Street (M1) Investigation and medial works LS 1 $ 100,000 $ 100,000 Total M1 Point Inflow Reduction $ 100,000

Level 1 I/I Remedial Works - INFLOW REDUCTION Churton School Pump Station Catchment ha 47 $ 5,000 $ 235,000 Russell Street Pump Station Catchment ha 68 $ 5,000 $ 340,000 Anaua Pump Station Catchment ha 70 $ 5,000 $ 350,000 Beach Road City Catchment ha 210 $ 5,000 $ 1,050,000 M9 Catchment ha 105 $ 5,000 $ 525,000 M8 ha 32 $ 5,000 $ 160,000 M5 ha 18 $ 5,000 $ 90,000 M2 ha 128 $ 5,000 $ 640,000 Total III Reduction $ 3,390,000

Beach Road Pump Station Controls Pump Station Upgrades Modify control system to optimise use of interceptor LS 1 $ 30,000 $ 30,000 Total Beach Road Modifications $ 30,000

Area A - Talbolt Street Pump Station Overflow Pump Station Upgrades Two new pumps with combined capacity of 10 Vs each 2 $ 15,000 $ 30,000 Installation and Misc. pipe and power upgrades at pump LS 1 $ 30,000 $ 30,000 station Total Area A $ 60,000

Area B - Spilling and Overflows on Wanganui East Interceptor Pipe Upgrades DN300mm Gravity Main m 75 $ 423 $ 32,000 DN450mm Gravity Main m 38 $ 480 $ 18,000 Storage Kowhai Park rn3 1336 $ 1,500 $ 2,004,000 River Reserve, near Young Street Intersection rn3 85 $ 1,500 $ 128,000 Total Area B $ 2,182,000

Area C - Anzac Pump Station Overflow Storage Anzac Parade rn3 23 $ 1,500 $ 34,000 Pump Station Upgrades Two new pumps with combined capacity of 13 Us each 2 $ 7,000 $ 14,000 Installation and Misc, pipe and power upgrades at pump LS 1 $ 25,000 $ 25,000 station Total Area C $ 73,000

Area F - Overflow and Spill Upstream of Anaua Street Pump Station Pump Station Upgrades Two new pumps with combined capacity of 32 Vs each 2 $ 8,000 $ 16,000 Installation and Misc. pipe and power upgrades at pump LS 1 $ 30,000 $ 30,000 station Total Area F $ 46,000

Area G - Spilling on Quick Avenue Pipe Upgrades DN300mm Gravity Main m 222 $ 423 $ 94,000 DN375mm Gravity Main m 182 $ 455 $ 83,000 Total Area G $ 177,000

Area H - Spilling and Overflow Upstream of Boyd Pump Station Storage River Reserve, near Brunswick Road m3 256 $ 1,500 $ 384,000 Total Area H $ 384,000

Area I - Spilling Top of Ha!swell Street Seal Manholes Seal Manholes each 1 $ 10,000 $ 10,000 Total Area I $ 10,000

Area J - Spilling in Peak Park Pipe Upgrades DN150mm Gravity Main m 24 $ 300 $ 7,000 Total Area J $ 7,000

Area K - Spilling near Virginia Lake Seal Manholes Seal Manholes each 3 $ 10,000 $ 30,000 Pipe Upgrades DN225mm Gravity Main m 206 $ 360 $ 74,000 Total Area K $ 104,000

Area L - Spilling in Central City Pipe Upgrades DN300mm Gravity Main m 123 $ 423 $ 52,000 DN375mm Gravity Main m 118 $ 455 $ 54,000 DN525mm Gravity Main m 453 $ 600 $ 272,000 DN675mm Gravity Main m 213 $ 680 $ 145,000 DN750mm Gravity Main m 612 $ 725 $ 444,000 Clean pipe m 57 $ 30 $ 2,000 Storage Laird Park rn3 69 $ 1,500 $ 104,000 Moutoa Gardens m3 1483 $ 1,500 $ 2,225,000 Total Area L $ 3,298,000

Area M - Spilling in Lower Carlton Avenue Pipe Upgrades DN375mm Gravity Main m 345 $ 525 $ 181,000 Total Area M $ 181,000

Area N - Spilling in Top of Wanganui East Nil - Model anomaly resolved Area 0 - Overflow at Plunket Street Pump Station Storage Near Pump Station rn3 33 $ 1,500 $ 50,000 Total Area 0 $ 50,000

Area P - Overflow at Aramoho Park Pump Station Pump Station Upgrades Commission 2nd pump to get combined capacity of 5 Vs LS 1 $ 10,000 $ 10,000 Total Area P $ 10,000

Area Q - Spilling at Back of Properties in Fitzherbert Ave Pipe Upgrades DN225mm Gravity Main m 435 $ 360 $ 157,000 Total Area Q $ 157,000

Area R - Spilling on Smithfield Road Pipe Upgrades DN225mm Gravity Main m 400 $ 360 $ 144,000 DN300mm Gravity Main m 190 $ 423 $ 80,000 Total Area R $ 224,000

Area S - Spilling in Kings Avenue Area Pipe Upgrades DN300mm Gravity Main m 58 $ 423 $ 25,000 Total Area S $ 25,000

Area T - Spilling in Gonville Seal Manholes Seal Manholes each 1 $ 10,000 $ 10,000 Pipe Upgrades DN225mm Gravity Main m 175 $ 360 $ 63,000 DN300mm Gravity Main m 574 $ 423 $ 243,000 DN375mm Gravity Main m 240 $ 455 $ 109,000 DN450mm Gravity Main m 749 $ 480 $ 360,000 0N525mm Gravity Main m 135 $ 600 $ 81,000 DN750mm Gravity Main m 222 $ 725 $ 161,000 DN825mm Gravity Main m 8 $ 750 $ 6,000 Clean pipe m 113 $ 30 $ 3,000 Storage Heads Road rn3 287 $ 1,500 $ 431,000 Hinau Street m3 395 $ 1,500 $ 593,000 Total Area T $ 2,060,000

Area W - Spilling Off SH3 - Storage Bullocks Yard rn3 197 $ 1,500 $ 296,000 Total Area W $ 296,000

Area AA - Liverpool Pump Station Cross Connection

Pump Station Upgrades

Modify control system to optimise use of upstream network LS 1 $ 15,000 $ 15,000 Total Area AA $ 15,000

Area BB - Heads Road Manhole Spilling Modify Overflow Monitor flow split, check levels of associated houses and LS 1 $ 10,000 $ 10,000 remove weir Pipe Upgrades DN225mm Gravity Main m 265 $ 360 $ 95,000 Total Area BB $ 105,000 Area G-1 - Spilling from Springvale Development! Rogers Street Pipe Upgrades DN150mm Gravity Main m 59 $ 300 $ 18,000 DN225mm Gravity Main m 98 $ 360 $ 35,000 DN450mm Gravity Main m 229 $ 480 $ 110,000 Total Area G-1 $ 163,000

Area G-2 - Spilling Upstream of Fox Road Pump Station N/A

Area G-3 - Spilling from Otamatea Development Pipe Upgrades DN150mm Gravity Main m 28 $ 300 $ 8,000 0N225mm Gravity Main m 329 $ 360 $ 118,000 Total Area G-3 $ 126,000

Area G-4 - Spilling on Sandy Lane Pipe Upgrades DN225mm Gravity Main m 164 $ 360 $ 59,000 DN300mm Gravity Main m 308 $ 423 $ 130,000 Total Area G-4 $ 189,000

TOTAL $ 13,822,000 GHD Level 2, 52 The Square Palmerston North 4410 T: 64 6 353 1800 F: 646 353 1801 E: [email protected]

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Rev Author Reviewer Approved for Issue No. Name Signature Name Signature Date 0 ARBaugham CAnderson BRudsits R'''' 1/4/16 www.ghd.com