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1. INTRODUCTION
The Council is responsible for providing and managing wastewater services for the city. It does this by
providing a wastewater transportation network comprising more than 1,000 kilometres of pipes and tunnels
with 62 pumping stations. The wastewater is treated at treatment plants at Moa Point, Karori and Porirua
1
.
The sludge from the treatment process at Moa Point and Karori is currently taken to the Council’s southern
landfill, where it is combined with green waste to make compost.
The cost of transporting, processing and disposing of the City’s wastewater is funded by ratepayers
through a targeted rate with 60% payable by the residential sector and 40% by the commercial sector.
The Council’s total operating cost to collect, treat and discharge wastewater is budgeted at $34.9 million for
the 2008/09 year.
Approximately 10% of total sewage treated through the Council’s treatment plants is ‘trade waste’ – waste
produced by businesses who are required to have a trade waste consent to discharge non-domestic waste
into the public wastewater system.
Discharging trade waste to the wastewater system places additional load on the system which may cause
accelerated corrosion, generate odours and dangerous gases, adversely affect the treatment processes or
adversely impact on the reuse of bio-solids (the waste remaining after the treatment and de-watering
process) and effluents. The additional load is created by the concentration of the substances discharged
and their total mass.
This policy sets out a framework to determine and implement a ‘mass flow charging regime’ where trade
waste producers will be expected to contribute to the cost of disposing of trade waste.
1. Wellington City Council owns a one third share of this plant.
FRAMEWORK FOR WASTE PLANS
Local Government Act 2002
Wastewater Asset
Management Plan
Long Tern Council
Community Plan
Revenue and
Financing
Policy
Other Statutes
eg Health Act
Waste Management Plans
Solid Waste Plan
Liquid Waste Plan
Bylaws
Activity Implementation
Guiding Principles Liquid Waste Plan:
1. Sustainable development
2. Liquid waste as a resource
3.Integrated solutions
4. Maori and Iwi views incorporated
5. Partnerships
6. Polluter pays
TRADE WASTE CHARGES POLICY
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2. POLICY OBJECTIVES
1.1 NEW ZEALAND WASTE STRATEGY 2002
The New Zealand Waste Strategy 2002 covers solid, liquid and gaseous waste, and recognises that moving
‘towards zero waste and a sustainable New Zealand’ is a long-term challenge. It has three core goals:
• lowering the social costs and risks of waste
• reducing the damage to the environment from waste generation and disposal
• increasing economic benefit by more efficient use of materials.
Key actions from the New Zealand Waste Strategy were for territorial authorities to produce Waste
Management Plans and incorporate these into the Long Term Council Community Plan. Specific targets were
also set for trade wastes and hazardous wastes. A fundamental policy principle was to implement a ‘polluter
pays’ system where disposal and treatment costs of trade waste can be recovered through consumption
based charges instead of the less precise capital value based targeted rates system.
2.2 LIQUID WASTE MANAGEMENT PLAN
Wellington City Council agreed its Solid Waste Management Plan in August 2003 and in 2005 adopted a Liquid
Waste Management Plan. This plan meets the requirements as set out in the Local Government Act 2002 and
the New Zealand Waste Strategy 2002. Council operates under legislation that makes waste reduction
a primary objective of any waste plan. The waste management hierarchy (in order of importance) is:
1. Reduction,
2. Reuse,
3. Recycling,
4. Recovery,
5. Treatment and
6. Disposal.
Every territorial authority is required to promote effective and efficient waste management and:-
1. have regard to environmental and economic costs and benefits for the district and
2. ensure that the management of waste does not cause a nuisance or be injurious to health.
Liquid wastes
2
are those that are generated in or converted to a liquid form for disposal. Wastewater in
Wellington city is collected by a network of pipes discharging to treatment facilities at Moa Point,
Karori and Porirua.
The principles underlying the Council’s Liquid Waste Management Plan include:
1. Sustainable development
All members of society are responsible for looking after the environment and for the impact of wastes
they produce.
2. Liquid waste is a resource
There are beneficial opportunities for reusing sewage and stormwater. Where opportunities are identified,
the viability of any systems will need to be explored.
2. Sustainable Wastewater Management (Ministry for the Environment) 2003. New Zealand Waste Strategy (Ministry for the Environment,
Local Government NZ) 2002.
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3. Integrated solutions
Potential solutions will take into account systems that, if possible:
- maximise use and benefits of natural
catchment areas
- are planned in conjunction with other infrastructural developments
- are as flexible as possible
- fit with community plans and views.
4. Maori and Iwi values are incorporated
Recognise and provide for the kaitiakitanga or guardianship role of local Iwi as defined in the 1991 Resource
Management Act.
5. Partnerships
Where appropriate, a co-operative approach to liquid waste planning will be taken with other regional
territorial authorities, the Greater Wellington Regional Council, local Iwi and the community to achieve joint
priorities.
6. Polluter pays
This reflects the concept that those who produce waste are responsible for its disposal (or otherwise). In
practice, this will only be relevant for trade waste at this stage.
2.3 FUTURE CHALLENGES
The Wellington City Council sewer and stormwater system are operating effectively and efficiently under
current standards as set out under the Resource Management Act 1991 and as required by Greater Wellington
Regional Council consents. However, the city faces several challenges over the next 10-15 years as new
legislative requirements come into place. The Council works to continually improve its management of assets
as the community’s expectations about the environment and sustainability change. The challenges that need
to be addressed include determining:
• the desirable stormwater quality standards for the natural waters in the city (that is, Wellington harbour,
south coast and streams)
• the acceptable frequency and extent of sewage overflows into natural waters
• how sewage sludge will be disposed of in the future
• the most effective and efficient way to manage trade waste.
Given the nature of liquid waste, the concept of ‘zero liquid waste’ is not a realistic expectation in the
foreseeable future. This means that Council will have a secondary, complementary objective to those set out
under the Local Government Act and the New Zealand Waste Strategy and that is to ensure that we manage
liquid waste in an environmentally, economically, socially and culturally sustainable manner.
2.4 DEVELOPMENT OF A TRADE WASTE FEES AND CHARGES POLICY
The Council’s Liquid Waste Management Plan identified the need to determine an appropriate charging
structure for the discharge of trade waste. The development and implementation of a ‘polluter pays’ charging
policy is the logical next step in the activation of this plan.
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3. POLICY RATIONALE
3.1 POLICY FUNDAMENTALS
All activities that require a trade waste consent under the Council’s Trade Waste Bylaw will be liable to pay
trade waste charges.
Trade waste charges will incorporate three components:
1. Volume – the amount of waste disposed through the sewer – measured in cubic metres (m
3
)
2. BOD - biological oxygen demand, a measure of the level of bacteria in the waste – measured in kilograms (kg)
3. Suspended solids – the content of solid material in the trade waste disposed –measured in kilograms (kg)
The revenue anticipated to be collected through trade waste charges in any year will reduce by an equivalent
amount, the level of rates required to be collected through the commercial sewerage rate.
All trade waste disposers will continue to pay sewage rates, but will receive a ‘domestic credit’ to avoid
double charging for services provided. Section 5.3 details the domestic credit calculation.
3.2 EXISTING FEES AND CHARGES
The total cost of the Council’s wastewater (sewage) collection, treatment and disposal is
funded through a targeted rate of which 60% is met by the residential (base
3
) and 40%
by non-residential property.
Prior to the introduction of this policy:
• residential ratepayers pay a fixed charge ($112.50 per connected property for 2008/09) with the balance of the
sectors share’ being funded through a rate per dollar of capital value payable on each connected property.
• non-residential ratepayers pay for their share of wastewater activity entirely through a rate per dollar of capital
value payable on each connected property.
The introduction of a trade waste charging policy will:
a) provide a mechanism by which trade waste disposers will be liable for the costs
b) provide an incentive for trade waste disposers to reduce the level of waste entering the sewer network,
reducing the risk of increased degradation of the network and limiting the environmental impacts of
waste disposal.
Introducing a charging system based on the amount and concentration of trade waste will bring Wellington
City in line with other major cities in New Zealand. The user pays charging philosophy provides a financial
incentive to waste minimisation initiatives. This is a key driver for influencing behaviour of business in
Wellington City to move towards increased sustainability.
This policy is enabled by the provisions for setting trade waste charges under the Council’s Trade Waste Bylaw
2004 and is consistent with the provisions for setting fees and charges under the Local Government Act 2002.
3.The base sector incorporates all land used for residential purposes, but excluding short-stay accommodation, vacant residential land and land used for
recreation, sporting or community purposes and which does not generate any pecuniary benefit.
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Existing trade waste consent fees set under the Council’s trade waste bylaw will continue to apply, as follows:
Service
Charge
Trade Waste Consent Fee – Initial application fee
$161.25
Trade Waste Consent Fee – High risk
$1,612.50
Trade Waste Consent Fee – Medium risk
$806.25
Trade Waste Consent Fee – Low risk
$268.75
Trade Waste Consent – Low risk (where a restaurant’s grease trap is discharging more
than 500g/m3 of BOD or suspended solids and/or more than 100g/m3 animal oil,
fat and grease)
$268.75
Trade Waste Consent Fee – Minimal risk
$86.00
Grease and Grease Traps – Initial application fee
Nil
Trade Waste: Grease traps
$107.50
Trade Waste: Shared grease trap (per premises)
$26.88
Trade Waste: Charge after first hour (per hour)
$107.50
Trade Waste: Monitoring (lab) charges
Actual
4. POLICY APPLICATION
The method and frequency of monitoring of trade waste discharge on which trade waste charges will be
based will vary dependant on the disposer’s trade waste index (TWI). TWI is a function of average historical
daily BOD multiplied by the average historical daily suspended solids.
TWI category
TWI range
Monitoring basis
Billing frequency
1
TWI of less than 3
Flow: Annual – based on water in
(meter) less domestic credit.
If unmetered – based on Flow meter.
(Flow meter costs will apply)
BOD: Annual - grab sample
SS: Annual - grab sample
Annual
2
TWI between 3 and 50
Flow: Annual – Flow meter
BOD: Quarterly - grab sample
SS: Quarterly – grab sample
Quarterly
3
TWI between 50 and
2000
Flow: Quarterly – Flow meter
BOD: Quarterly – 24 hour sampler
SS: Quarterly – 24 hour sampler
Quarterly
4
TWI greater than 2000
Flow: Daily – in line meter
BOD: Daily – 24 hour auto-sampler
SS: Daily – 24 hour auto-sampler
sample
Monthly
All trade disposers will be subject to the same charging regime irrespective of TWI category.
The responsibility to comply with the prescribed monitoring regime rests with the trade waste disposer.
This will be a condition of maintaining a trade waste consent.
Monitoring costs will continue to remain the responsibility of the trade waste disposer, as per the existing
requirements of the trade waste consent with the exception of TWI Category 4 disposers: the Council will
conduct monitoring and recover the cost from the disposer on an “actual and reasonable” basis.
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5. CALCULATING FEES AND CHARGES
5.1 TRADE WASTE LIMITS AND CHARGES
Trade waste limits will be governed by a trade waste consent, which will be consistent with the Council’s
Trade Waste Policy.
Trade waste charges will be based on the following formulae:
Charging basis
Threshold
Maximum pricing based on 2008/09 draft budgets
Volume (total flow)
$ per cubic meter of volume
Up to 100m
3
/day
$0.20/m
3
(variable cost)
Between 100m
3
/day and
7,000m3/day
$0.10 /m
3
(marginal cost)
Above 7,000m
3
/day
$0.73/m
3
( full cost – applicable from 1/07/09)
B.O.D
$/kg based on composite daily sample
Up to 3,150 kg per day
$0.24/kg (variable cost)
Above 3,150 kg per day
$0.57/kg (full cost –applicable from 1/07/09)
Suspended solids
$/kg based on composite daily sample
Up to 1,575 kg per day
$0.24/kg (variable cost)
Above 1,575 kg per day
$0.54/kg (full cost –applicable from 1/07/09)
Council Monitoring
Actual and reasonable
TWI Category 4
TWI Category 1-3 responsible for own monitoring costs per
consent conditions.
• For the purposes of establishing charges for BOD and suspended solids, variable costs and marginal costs
are the same.
• The variable/marginal pricing mechanism for Volume promotes the ‘polluter pays’ principle and provides
an incentive for low trade waste disposers to maintain trade waste discharges at or below 100m
3
/day.
5.2 ADDITIONAL MONITORING
In addition to the measurements above, the following monitoring will also be conducted for TWI Category 4
disposers and results provided to the Council:
Measurement method
Frequency
Guideline
BOD
In-line meter
Hourly composite sample
Less than 150kg/hour
Sulphate
Random grab samples
To be agreed
Less than 200mg/l
Temperature
Temperature logger
Variable
Less than 35 degrees celsius
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The additional monitoring recognises that:
• spikes in BOD levels may have an impact on sewer degradation. Accordingly trade waste disposers will
attempt to limit maximum BOD discharge to 150 kg/hr.
• high sulphate and temperature levels may contribute to accelerated sewer degradation, particularly when
experienced in conjunction with high BOD levels.
• 2007 monitoring showed no evidence of accelerated degradation in the area of the sewer potentially most
at risk (the Ngaio Interceptor sewer).
• Accordingly no sulphate or temperature based charges are proposed at this time. However it is prudent to
maintain guidelines to limit the potential for accelerated degradation and associated charges at some time
in the future.
• Being within the guidelines indicated above does not exclude a trade waste disposer from the possibility
of charges for temperature and/or sulphate components of trade waste should these be required to reflect
accelerated degradation of the sewer in the future.
• TWI Category 4 disposers will be required to meet the cost of camera and/or manual inspections of pre-
specified sewers. The timing of each inspection will be at the discretion of the Council but shall be at an
average frequency of not less than seven years.
• Should future sewer inspections indicate accelerated degradation of the sewer (i.e. beyond reasonable
depreciation expectations) the Council reserves the right to introduce trade waste charges for temperature
and/or sulphate components of trade waste to reflect the incurring of any costs directly related to this
accelerated degradation.
5.3 DOMESTIC SEWAGE ALLOWANCE
The domestic portion of waste is funded through sewage rates. It is therefore appropriate to provide
an allowance or “credit” for the domestic portion of waste entering the sewerage system.
The domestic credit reflects the proportion of wastewater generated by employees and/or customers
of trade waste disposers.
Domestic credit component calculation:
Base assumptions used in establishing the domestic component of waste are as follows:
a = Number of FTE’s
b = Number of hours per day per FTE
c = Average number of days worked per year per FTE
Flow = 50 litres per day (24 hours).
BOD = 220 mg/litre of water
SS = 220 mg/litre of water
b / 24 hours = d% = daily allowance per shift
Z litres = d% x 1.1 (10% margin) x 50 litres x a persons x c days
Quantity
Rate
Credit
Total Flow
Z/1000
m
3
x
$ 0.73
= $x,xxx
SS
Z*0.00022
kg
x
$ 0.54
= $x,xxx
BOD
Z*0.00022
kg
x
$ 0.57
= $x,xxx
$x,xxx
• The domestic credit rate is based on the ‘full cost’ of sewerage activity.
• Any adjustment to this rate will be as per section 6 of this schedule.
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6. TRADE WASTE CHARGING METHODOLOGY
Trade waste charges will be based on the following calculations:
Volume:
Cost of sewerage collection, transportation and 50%
of treatment costs*
divided by
Total inflow (m
3
) to sewerage treatment facilities**
= flow charge per m
3
of waste
Up to 100m
3
per day
=
based on variable cost
Between 100m
3
per day and 7,000m
3
per day
=
based on marginal cost
Above 7000m
3
per day
=
based on full costs (from 01/07/09)
* Total cost is per Sewerage Activity budget per Council Draft 2008/09 Annual Plan.
** Total treatment facility inflow based on 3 year rolling average (revised annually)
BOD:
25% of sewerage treatment costs*
divided by
Total BOD inflow (kg) to sewerage treatment facili-
ties**
= BOD charge per kg
Up to 3,150kg/day
=
based on variable cost
Above 3,150kg/day
=
based on full cost (from 01/07/09)
* Total cost is per Sewerage Activity budget per Council Draft 2008/09 Annual Plan.
** Total treatment facility BOD based on 3 year rolling average (revised annually)
Suspended solids:
25% of sewerage treatment costs plus cost of solid
waste disposal*
divided by
Total suspended solid inflow (kg) to sewerage treat-
ment facilities**
= suspended solid charge per kg
Up to 1,575kg/day
=
based on variable cost
Above 1,575kg/day
=
based on full cost (from 01/07/09)
* Total cost is per Sewerage Activity budget per Council Draft 2008/09 Annual Plan.
** Total treatment facility suspended solids based on 3 year rolling average (revised annually)
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7. INTRODUCTION, REVIEW AND TRANSITIONAL PROVISIONS
7.1 POLICY INITIATION
Base level trade waste charges (marginal/variable cost basis) will be applicable from 1 July 2008. The charges
will be derived from the operating costs shown in the Council’s 2008/09 Annual Plan.
Trade waste charge based on full cost will be applicable from 1 July 2009. Between 1 July 2008 and 30 June
2009 trade waste charges for exceeding permitted limits will be charged as follows:
1. Volume: at marginal cost charge rate and
2. BOD & suspended solids: at the variable cost charge rate.
7.2 POLICY REVIEW
Charges will be reviewed annually to reflect changes in:
a) the cost of delivery of sewage transportation, treatment and disposal services
b) the volume of liquid waste delivered to Council’s treatment plants
c) the mass of BOD delivered to Council’s treatment plants
d) The mass of suspended solids delivered to Council’s treatment plants.
7.3 ADDITIONAL CHARGES
The introduction of charges based on temperature and sulphate in trade waste will be considered on a
periodic basis and in response to inspections of sewers. Trade waste component charges for temperature and/
or sulphate will only be introduced if evidence of accelerated sewer degradation is detected.
For the purposes of this policy “accelerated degradation” is defined as the situation where sewer
infrastructure is deteriorating at a faster rate than the anticipated life of the infrastructure components as
reflected in Council’s Asset Management Plans. Where accelerated degradation occurs, additional charges will
be required to fund the increased rate of depreciation on the asset.
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8. INDICATIVE CHARGES
Chart 1: Contribution to Trade Waste to Total Liquid Waste
0
5,000,000
SS Kg
BOD Kg
10,000,000
15,000,000
20,000,000
25,000,000
30,000,000
35,000,000
Flow M
3
BOD Kg
SS Kg
Total Waste
31,109,780
6,918,106
12,120,011
Total Trade Waste
2,564,058
809,420
483,514
Flow M
3
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Chart 2a. Proposed Trade Waste Charges for 2008/09 (GST exclusive)
Up t
o 100m
3
/d
a
y
Up t
o 3
,
1
5
0 k
g/d
a
y
Up t
o 1
,575 k
g/d
a
y
Ov
er
100m
3
/d
a
y u
p t
o 7
,000m
3
/d
a
y
Up t
o 3
,
1
5
0 k
g/d
a
y
Up t
o 1
,575 k
g/d
a
y
Abo
v
e 7
,000m
3
/d
a
y
Up t
o 3
,
1
5
0 k
g/d
a
y
Up t
o 1
,575 k
g/d
a
y
0.20
0.24
0.24
0.10
0.24
0.24
0.24
0.24
0.10
Flow (per m
3
)
BOD (per kg)
SS (per kg)
$
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
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Chart 2b. Proposed Trade Waste Charges for 2009/10 (GST exclusive)
(Subject to change by Sewerage Activity Budget per 2009/10 Annual Plan)
Flow (per m
3
)
BOD (per kg)
SS (per kg)
$
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
Up t
o 100m
3
/d
a
y
Up t
o 3
,
1
5
0 k
g/d
a
y
Up t
o 1
,575 k
g/d
a
y
Ov
er
100m
3
/d
a
y u
p t
o 7
,000m
3
/d
a
y
Up t
o 3
,
1
5
0 k
g/d
a
y
Up t
o 1
,575 k
g/d
a
y
Abo
v
e 7
,000m
3
/d
a
y
Up t
o 3
,
1
5
0 k
g/d
a
y
Up t
o 1
,575 k
g/d
a
y
0.20
0.24
0.24
0.10
0.24
0.24
0.57
0.54
0.73
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$
900,000
800,000
700,000
600,000
500,000
400,000
300,000
200,000
100,000
0
C
on
sents
Flo
w
BOD
Su
spend
ed Solid
s
To
t
a
l
Chart 3: Indicative Trade Waste Charge Revenue 2008/09 (GST exclusive)
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45
40
35
30
25
20
15
10
5
0
Belo
w
$1
,000
Chart 4: Incidence of Trade Waste Charges - including consent costs (GST exclusive)
No. of d
ispo
ser
s
$1
,000 t
o $2,000
$2,000 t
o $5
,000
$5
,000 t
o 1$0,000
$10,000 t
o $5
0,000
$5
0,000 t
o $100,000
$100,000 t
o $3
00,000
Abo
v
e $3
00,000
Range of annual charges (excl GST)
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TRADE WASTE CHARGE CALCULATION - ACTIVITIES 6.4.3 + 6.4.4 VARIABLE COSTS
Reception, Conveyancing & Discharing Cost 08/09 Draft Annual Plan
Total AP
Opex
Exclude
Fixed Costs
Total
Flow
BOD
SS
Activity
Project
Project Name
6.4.3
A041
Sewerage Network Asset Stewardship
11,725,350
(11,664,390)
60,960
60,960
6.4.3
C084
Trade Waste Enforcement
260,039
(75,135)
184,904
184,904
6.4.3
C085
SPE Unplanned Maintenance
292,581
(68,803)
223,778
223,778
6.4.3
C086A
Sewerage Network Unplanned Maintenance
1,641,860
(237,453)
1,404,407
1,404,407
6.4.3
C089
Sewer Interceptor Flow Monitoring
115,986
(21,056)
94,930
94,930
6.4.3
C495
Critical Drain Inspections
461,094
(98,576)
362,518
362,518
6.4.3
C497
Sewer Network Asset Information
292,744
(77,779)
214,965
214,965
6.4.3
C501
Pollution Detection & Monitoring
60,925
(7,148)
53,777
53,777
6.4.3
C502
Pump Station Ops & Maintenance
790,521
(63,716)
726,805
726,805
Treatment Costs of Sewage 07/08 DAP
6.4.4
C087
Clearwater Operations & Maintenance
15,976,713
(11,462,902)
4,513,811
2,256,906
1,128,453 1,128,453
6.4.4
C088
Porirua Sewage Treatment Contribution
1,428,331
(2,653)
1,425,678
712,839
356,420
356,420
Suspended Solids Cost
6.4.4
C347
Living Earth Green waste Contract
1,943,649
(990,448)
953,201
953,201
Total Opex Cost
34,989,793
(24,770,059)
10,219,734
6,296,789 1,484,872 2,438,073
Flow
M
3
BOD
Kg
SS
Kg
Total Volume for 12 months
30,860,600
6,101,703 10,081,473
Unit Rate
$0.20
$0.24
$0.24
1. CALCULATION OF CHARGES APPLYING TO:
Volume:
Up to 100m
3
per day
BOD:
Up to 3,150 kg per day
Suspended solids
Up to 1,575 kg per day
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TRADE WASTE CHARGE CALCULATION - ACTIVITY 6.4.3 MARGINAL COST
Reception, Conveyancing & Discharing Cost 08/09 Draft Annual Plan
Total AP
Opex
Less fixed &
non-marginal
Total
Flow
BOD
SS
Activity Project Project Name
6.4.3
A041
Sewerage Network Asset Stewardship
11,725,350
(11,725,350)
–
6.4.3
C084
Trade Waste Enforcement
260,039
(260,039)
–
6.4.3
C085
SPE Unplanned Maintenance
292,581
(292,581)
–
6.4.3
C086A
Sewerage Network Unplanned Maintenance
1,641,860
(1,641,860)
–
6.4.3
C089
Sewer Interceptor Flow Monitoring
115,986
(115,986)
–
6.4.3
C495
Critical Drain Inspections
461,094
(461,094)
–
6.4.3
C497
Sewer Network Asset Information
292,744
(292,744)
–
6.4.3
C501
Pollution Detection & Monitoring
60,925
(60,925)
–
6.4.3
C502
Pump Station Ops & Maintenance
790,521
(790,521)
–
Treatment Costs of Sewage 07/08 DAP
6.4.4
C087
Clearwater Operations & Maintenance
15,976,713
(11,462,902)
4,513,811
2,256,906
1,128,453
1,128,453
6.4.4
C088
Porirua Sewage Treatment Contribution
1,428,331
(2,653)
1,425,678
712,839
356,420
356,420
Suspended Solids Cost
6.4.4
C347
Living Earth Green waste Contract
1,943,649
(990,448)
953,201
953,201
Total Opex Cost
34,989,793
28,097,103
6,892,690
2,969,745
1,484,872
2,438,073
Flow
M
3
BOD
Kg
SS
Kg
Total Volume for 12 months
30,860,600
6,101,703 10,081,473
Unit Rate
$0.10
$0.24
$0.24
2. CALCULATION OF CHARGES APPLYING TO:
Volume:
Between 100m
3
per day and 7,000m
3
per day
BOD:
Up to 3,150 kg per day
Suspended solids
Up to 1,575 kg per day
Page 17
WELLINGTON CITY COUNCIL DRAFT ANNUAL PLAN 08/09
126 APPENDICES
P
A
PPENDICES
TRADE WASTE CHtARGE CALCULATION - Activity 6.4.3 + 6.4.4 Full Cost
Reception, Conveyancing & Discharing Cost 08/09 Draft Annual Plan
Total AP
Opex
Adjustments*
Total
Flow
BOD
SS
Activity Project
Project Name
6.4.3
A041
Sewerage Network Asset Stewardship
11,725,350
11,725,350
11,725,350
6.4.3
C084
Trade Waste Enforcement
260,039
260,039
260,039
6.4.3
C085
SPE Unplanned Maintenance
292,581
292,581
292,581
6.4.3
C086A
Sewerage Network Unplanned Maintenance
1,641,860
1,641,860
1,641,860
6.4.3
C089
Sewer Interceptor Flow Monitoring
115,986
115,986
115,986
6.4.3
C495
Critical Drain Inspections
461,094
461,094
461,094
6.4.3
C497
Sewer Network Asset Information
292,744
292,744
292,744
6.4.3
C501
Pollution Detection & Monitoring
60,925
60,925
60,925
6.4.3
C502
Pump Station Ops & Maintenance
790,521
790,521
790,521
Treatment Costs of Sewage 07/08 DAP
6.4.4 C087
Clearwater Operations & Maintenance
15,976,713
(3,447,000)
12,529,713
6,264,857 3,132,428
3,132,428
6.4.4 C088
Porirua Sewage Treatment Contribution
1,428,331
1,428,331
714,166
357,083
357,083
Suspended Solids Cost
6.4.4 C347
Living Earth Green waste Contract
1,943,649
1,943,649
1,943,649
Total Opex Cost
34,989,793
(3,447,000)
31,542,793
22,620,122
3,489,511
5,433,160
Flow
M
3
BOD
Kg
SS
Kg
Total Volume for 12 months
30,860,600
6,101,703
10,081,473
Unit Rate
$0.73
$0.57
$0.54
3. CALCULATION OF CHARGES APPLYING TO:
Volume:
Above 7,000m
3
per day
BOD:
Above 3,150 kg per day
Suspended solids
Above 1,575 kg per day