User Guide for Estimated Rehabilitation Cost Calculator ...

Cost Calculator for Petroleum and Gas
Queensland Department of Environment and Science (ESR/2019/4627) ii
Prepared by: Regulation Support, Department of Environment and Science
© State of Queensland, 2019.
The Queensland Government supports and encourages the dissemination and exchange of its information. The copyright in this publication is licensed under a Creative Commons Attribution 4.0 Australia (CC BY) licence.
Under this licence you are free, without having to seek our permission, to use this publication in accordance with the licence terms.
You must keep intact the copyright notice and attribute the State of Queensland as the source of the publication.
For more information on this licence, visit http://creativecommons.org/licenses/by/4.0/au/deed.en
Disclaimer
While this document has been prepared with care it contains general information and does not
profess to offer legal, professional or commercial advice. The Queensland Government accepts no
liability for any external decisions or actions taken on the basis of this document. Persons external to
the Department of Environment and Science should satisfy themselves independently and by
consulting their own professional advisors before embarking on any proposed course of action.
Approved: March 2019
Ph. 1300 130 372 (option 4)
Fax. (07) 3330 5875
Version Effective date Description of changes
1.00 1 April 2019 This user guide has been prepared to support the use
of the Petroleum and Gas Estimated Rehabilitation Cost
Table of Contents
1 Introduction ................................................................................................................ 1
1.3 Key Differences to the Financial Assurance Calculator ..................................... 1
2 Process of Estimated Rehabilitation Cost Creation .............................................. 2
3 General Use Principals .............................................................................................. 6
3.1 Colour Coding ........................................................................................................... 6
3.2 Quantity Entry ........................................................................................................... 6
3.3 Comment Entries ...................................................................................................... 7
3.4 Default Quantities ..................................................................................................... 7
3.6 Navigation, Search and Information ...................................................................... 8
3.7 Add Rows Buttons .................................................................................................... 9
3.8 Drop Down Menus ................................................................................................... 9
3.9 Review Elements .................................................................................................... 10
4.1 Security .................................................................................................................... 11
4.2 Sheets ...................................................................................................................... 11
4.6.1 Sheet Description ...................................................................................... 15
4.6.3 Environmental Maintenance and Monitoring Multiplier ....................... 16
4.7 Table of Values (TOV) ........................................................................................... 17
4.8 Assumptions Sheet ................................................................................................ 18
4.9.1 Seismic User Input Sheet ........................................................................ 20
4.9.2 Infrastructure User Input Sheet ............................................................... 20
4.9.3 Pipelines User Input Sheet ...................................................................... 20
4.9.4 Gas Processing Facilities and Oil Storage Facilities User Input
Sheet ........................................................................................................... 21
4.9.5 Water Treatment Plants and Water Transfer Stations User Input Sheet
..................................................................................................................... 22
4.9.7 Miscellaneous Activities User Input Sheet ............................................ 24
4.9.7.1 Miscellaneous Rehabilitation and Rehabilitation ........ 24
4.9.7.2 Preliminary and Intrusive Site Investigations .............. 25
4.9.7.3 Remediation of Contaminated Areas ........................... 27
4.9.7.4 Long Distance Haul ........................................................ 27
Queensland Department of Environment and Science (ESR/2019/4627) iv
5 Information on Rates ............................................................................................... 29
5.1 Bottom-up, First Principles Calculation Method ................................................ 29
5.2 Labour Costs ........................................................................................................... 29
5.3 Equipment Costs .................................................................................................... 29
5.6 Alternate Rates ....................................................................................................... 31
6 Focus Items .............................................................................................................. 33
6.3 Mobilisation, De-mobilisation and Fleet Size ..................................................... 34
6.4 Haulage Distances ................................................................................................. 35
7 Worked Example ...................................................................................................... 36
7.1 Seismic Easements ............................................................................................... 36
7.3 Pipelines .................................................................................................................. 40
7.5 Gas Processing Facility in User Input Sheet ..................................................... 42
7.6 Water Transfer Facility .......................................................................................... 44
7.7 Camps in Main Sheet ............................................................................................ 45
7.8 Camps in Infrastructure User Input Sheet .......................................................... 46
8 Glossary .................................................................................................................... 48
List of Tables
Table 4-1 Sheets
Figure 3-2 Quantity Input Example in the Main Sheet
Figure 3-3 Quantity Input Example in the GPF and Oil Storage Input Sheet
Figure 3-4 Alternate Rate Cells
Figure 3-5 Alternate Rate Cell turn Red upon Entry
Figure 3-6 Rationale for Alternate Rate
Figure 3-7 Example of “Back to Contents” Hyperlink
Figure 3-8 Find Button in Table of Values
Figure 3-9 Example of Hover text
Figure 3-10 Example of Add Row Button
Figure 3-11 Example of Drop-down Menu
Figure 3-12 Show / Hide Rows Button in Main Sheet
Figure 3-13 Show / Hide Rows Button in Summary Sheet
Figure 4-1 Contents Sheet
Figure 4-2 Registration Sheet
Figure 4-3 Main Sheet – Top showing Header and beginning of Exploration Domain
Figure 4-4 Main Sheet - Subtotal for Exploration Domain
Figure 4-5 Example of User Selection where TOV Rates are not all in the Main Sheet
Figure 4-6 Example of Values coming From User Input Sheet
Figure 4-7 Example of User Entered Quantity in Main
Figure 4-8 Example of Additional Rows for User Defined Entries
Figure 4-9 Show / Hide Rows button in Summary Sheet
Figure 4-10 Project Management User Entry
Figure 4-11 Find Button and Search Box in Table of Values
Figure 4-12 Example of highlighted search results and prompt to find next result
Figure 4-13 Example of Header of User Input Sheets
Figure 4-14 Map ID
Figure 4-16 Oil Storage Facilities Inputs
Figure 4-17 Oil Storage Facilities Costs
Figure 4-18 Water Transfer Stations Inputs
Figure 4-19 Water Transfer Stations Costs
Figure 4-20 Dams Inputs
Figure 4-21 Contaminated Land Investigation for Dams – One off Cost Input
Figure 4-22 Example of Input Table in Miscellaneous Activities
Figure 4-23 Preliminary Site Investigation Entry
Figure 4-24 Example of Use of One-off Cost
Figure 4-25 Example of a Fraction Entry of One-off Cost
Figure 4-26 Land Investigation Input Cells showing Options for Defining the Area
Figure 4-27 Long Distance Haul of Top Soil
Figure 5-1 Inputs to Table of Values (Build-up of Unit Rates)
Figure 6-1 Water and Salt Management in Main Sheet
Figure 6-2 Mobilisation / Demobilisation Default Rates
Queensland Department of Environment and Science (ESR/2019/4627) vi
List of Appendices
Appendix A User Input Sheets Options, Inputs, Defaults and Calculated Values
Acronyms, Initialisms and Abbreviations
Acronyms, Initialisms and Abbreviations
EA Environmental Authority
ROP reverse osmosis plant
TOV Table of Values
WTP Water Treatment Plant
WTS Water Transfer Station
1 Introduction
1.1 Purpose of Document
This document is a User Guide for the Estimated Rehabilitation Cost (ERC) Calculator (hereafter the “Calculator”) for petroleum and gas activities in Queensland. The ERC Calculator commenced in 1 April 2019, replacing the Financial Assurance Calculator
This document includes:
Explanation of how to use the Calculator.
Description of the architecture of the Calculator including the various Sheets.
Explanation of cost rates and how they are constructed.
Worked examples.
Definitions of specific words and phrases used throughout this User Guide are listed in Section 8.
1.2 Purpose of Calculator
The purpose of the Calculator is to provide a tool to calculate the ERC as required by the Environmental Protection Act 1994. The Calculator provides consistent approach to estimating the full cost to the Queensland Government to decommission, rehabilitate and close a petroleum and gas operation.
1.3 Key Differences to the Financial Assurance Calculator
The Calculator, which replaces the Financial Assurance Calculator, has been significantly revised:
1. The values in the Table of Values (TOV) are calculated using bottom-up, first principles methods (see Section 5 for information on rates).
2. One Input Sheet per Domain (e.g. Gas Processing Facilities) with singular items added as rows.
3. One workbook in place of the former multiple workbooks (Exploration and Operations).
Process of Estimated Rehabilitation Cost Creation
Queensland Department of Environment and Science (ESR/2019/4627) 2
2 Process of Estimated Rehabilitation Cost Creation
The User is recommended to follow these steps:
1. Download the Calculator. The Calculator is available on the Queensland Government’s Business Queensland website at: https://www.business.qld.gov.au/running-business/environment/licences- permits/rehabilitation/security-deposit
2. Click on the hyperlink to the Petroleum and Gas Calculator and a pop-up window like the one below will appear (this will look different depending on the internet browser used) and click ‘Open’ (or similar depending on the internet browser).
3. Another window like the one below may pop-up. Click “Allow” and the Calculator will open in Excel™.
4. Enable Editing and Macros. When the spreadsheet opens in Microsoft Excel a yellow banner may appear at the top of the window asking the user to enable editing, click ‘Enable Editing’. Another yellow banner may appear stating that ‘Macros have been disabled’, click ‘Enable Content’.
5. Save the file as a new name preferably as Company Site ERC Date (e.g. Gas International Surat Basin ERC 10Jan19). By downloading the Calculator, the User agrees to the Terms and Conditions. The User can review the Terms and Conditions in the “Terms-con” (further right of the Sheets).
6. Either go direct or navigate via the CONTENTS Sheet (see below) to the Registration Sheet.
7. Enter the required details to the Registration Sheet (see below).
8. Go to the Main Input Sheet and populate details. 9. If required, go to the relevant User Input Sheet and enter details. 10. Read the ‘Use’ information at the top of the User Input Sheet (example below).
Estimated Rehabilitation Cost (ERC) for Petroleum and Gas
REGISTRATION
Tenure Numbers: Site Name:
Site Contact: Position:
Site Address: Phone:
Justification:
If the User enters a Project Management and / or Environmental Maintenance and Monitoring value, please provide justification above.
Signature of Assessor
Date: Date:
By signing above, the signees state this is an accurate assessment of the rehabilitation liability for the site.
Below this line for the Department's use only
Signature of Department
11. In the User Input Sheets, enter quantities to Input cells and select options from the
drop-down menus as required. In most cases, the entries should be added moving from left to right across the rows. Inputs to the tables for Oil Storage Facilities and Water Transfer Stations are entered from top to bottom moving down the columns.
12. Continue populating the User Input Sheets applicable to the site. 13. Review the Summary Sheet for the rolled-up totals.
14. If site-specific Project Management and/or Environmental Maintenance and Monitoring values are justified, enter these to the cells in the Summary Sheet and provide an explanation in the space provided in the Registration Sheet.
INFRASTRUCTURE INPUT SHEET
Back to Contents
Total for this Input Sheet -$ -$ Total ERC Amount
Use: Use this input sheet to show the quantities for Roads, Laydown, Borrow Pits, Camps, Buildings. Click in title cells for tips on specific use. The user is not permitted to change the Unit Rates. If a more specific estimate is required, the user must provide an itemised alternate rate calculation and enter this rate to the Main Sheet.
15. Re-visit the Registration Sheet and sign (or electronically add) in the space provided. Please note that although preferred (to assist with future correspondence), signing is not mandatory. However signing the ERC approved form is mandatory, and by signing the approved form you certify that the calculation provided is true, correct, complete and does not provide misleading information.
Date: Date:
General Use Principals
3 General Use Principals
3.1 Colour Coding
Table 3-1 describes the colour coding used throughout the Calculator. All cells except green and yellow are locked to the User.
Table 3-1 Colour Coding or Cells
Word Definition
Green Cells to which the User can input values or text, select options from drop down menus and click on hyperlinks to access other Sheets or areas within a Sheet.
Yellow Yellow cells are reserved for User Entered Alternate Rates. If an Alternate Rate is entered, the yellow rate cell turns pink with red font to inform the Department. If an Alternate Rate is entered the User must provide explanation in the accompanying “Rationale for Alternate Rate” cells.
Purple cells Reserved for Default Rates sourced from the TOV.
Hatched cells Structural block-out cells indicating no active part in the Calculator
White cells Calculated quantities and fixed text that the User cannot change
A screen shot of the colour code key is shown as Figure 3-1.
Figure 3-1 Colour Code Key
3.2 Quantity Entry
The User enters quantities to the green cells, examples are shown in Figure 3-2 and Figure 3-3.
Figure 3-2 Quantity Input Example in the Main Sheet
Colour Code Key
User Input Cells
Locked cell - Default Rates
#6.02 Pipelines (above-ground) from Input sheet total
#6.03 Buried gas decommissioning - purging, cut, cap (< = 0.5
m diameter) km
(> 0.5 m diameter) km
Figure 3-3 Quantity Input Example in the GPF and Oil Storage Input Sheet
3.3 Comment Entries
The Calculator includes the following space for User comments:
Assumptions Sheet – the intent of this Sheet is to allow Users to enter general information about the ERC application (see Section 4.8 for further information).
User Input Sheets – a User Comments box is included at the top of each User Input Sheet and this is intended for information specific to the Domain (e.g. specific to Dams) and general for that Domain (e.g. applies to all the Dams).
Rationale for Alternate Rate – wherever an Alternate Rate is allowed, there is an adjacent (or nearby) space for the User to provide the justification for this rate.
The User is encouraged to provide succinct and specific information to assist the Department to understand the intent and assumptions underpinning the User’s entries.
3.4 Default Quantities
The Calculator has some cells which includes default quantities which are used in the absence of a User entry. If a User enters a quantity where a default is present, the Calculator uses the User entry instead of the default. Examples of default quantities are shown in Table 3-2.
Table 3-2 Examples of Default Quantities
Sheet Default Quantity Type and Value
Screen Shot
Infrastructure Thickness of surface covering (150 mm)
Pipelines Width of easement. Note the varying defaults dependent on the extent of rehabilitation of the easement.
OIL STORAGE FACILITIES
-$
Elements Size Unit Unit Rate
Total disturbance area for final grade and seed (pasture) ha 3,035$
Total disturbance area for final grade and seed (native) ha 5,255$
Vertical, Steel, Open-top, Liner Base 0.14 ML 3,320$
* If no rehab length is entered, the workbook assumes default of 5% of the total length requires rehab
REMOVAL OF SURFACE COVERING
3.5 How to Enter an Alternate Rate
Alternate Rates are entered to the yellow cells in the Main Sheet and User Input Sheets (Figure 3-4). Alternate Rates must have the same unit as the Default Rates, otherwise they should be listed as an additional item in the rows provided (see Section 4.5 for further information).
Figure 3-4 Alternate Rate Cells
If an Alternate Rate is entered, the calculator uses the Alternate Rate over the Default Rate and the Alternate Rate cell turns red (Figure 3-5).
Figure 3-5 Alternate Rate Cell turn Red upon Entry
If the User enters an Alternate Rate, the User must provide justification in the ‘Rationale for Alternate Rate’ column (Figure 3-6). Alternate rates, including third party quotes, entered into the ERC Calculator must meet the requirements in the Estimated Rehabilitation Coast (ERC) Guideline (ESR/2018/4425).
Figure 3-6 Rationale for Alternate Rate
3.6 Navigation, Search and Information
Hyperlinks in the Contents Sheet are used to access Sheets within the Calculator, and the “Back to Contents” hyperlink in the Sheets can be used to return to the Contents Sheet.
Figure 3-7 Example of “Back to Contents” Hyperlink
As the Calculator is purpose-built and requires security to prevent inadvertent corruption, the standard Excel search function (i.e. ctrl+F) does not work. To account for this a Find button is incorporated into the Table of Values Sheet and this allows Users to search for key words or phrases in this Sheet (Figure 3-8).
4. Power Generation and Distribution
#4.01 Overhead powerlines (steel towers) km $30,204 $0
4. Power Generation and Distribution
#4.01 Overhead powerlines (steel towers) km $30,204 $25,000 $0
Third-party rate supplied by Contractor X
(support attached)
Back to Contents
General Use Principals
Figure 3-8 Find Button in Table of Values
Information elements within the Calculator include the “Use” box at the top of each Input Sheet and hover text in specific cells. Hover text is generally in the heading of a column (Figure 3-9). The hover text is viewed by the User clicking in the target cell. Not all cells have hover text.
Figure 3-9 Example of Hover text
3.7 Add Rows Buttons
The Infrastructure User Input Sheet include tables with Add Row buttons (Figure 3-10). When the button is clicked one additional Element (one per click) is added.
Figure 3-10 Example of Add Row Button
3.8 Drop Down Menus
Drop down menus are in green cells and allow selection of:
1. Haul distance (e.g. for top soil for road rehabilitation) 2. Surface cover type
Table of Values - Petroleum and Gas ERC Calculator
2018 Rates Prepared by EHS Support / Mike Slight and Associates
Activity / Description Unit Rate Use
Find
TOV #
3. Seed type
An example of a drop-down menu for surface covering is shown in Figure 3-11.
Figure 3-11 Example of Drop-down Menu
3.9 Review Elements
The review elements are click buttons (see examples below) designed to allow easy viewing / finding of information and include:
Show / Hide Rows button in Main (Figure 3-12) and Summary (Figure 3-13).
Figure 3-12 Show / Hide Rows Button in Main Sheet
Figure 3-13 Show / Hide Rows Button in Summary Sheet
SUMMARY
Architecture of Calculator
4 Architecture of Calculator
4.1 Security
To prevent inadvertent changing of formulas, text and processes, the Calculator is locked with only green and yellow cells available for User entry.
4.2 Sheets
Table 4-1 lists the Sheets available in Calculator with a description of the intended use. Further detail on each User Input Sheet is provided in the next section.
Table 4-1 Sheets
Sheet Type Attributes, Purpose and Use
CONTENTS Navigation Lists the Sheets available to the User and is the primary navigation Sheet for the Calculator.
Registration User Input For entry of details defining the site, regulatory reference, previous ERC, key personnel and department review details.
Summary Review Shows the rolled-up total cost for each domain and the multipliers for Maintenance and Monitoring, Project Management and Contingency (to be determined).
Main User Input The primary Sheet in the Calculator for User entries. For many cases, the User may only need to enter quantities to this Sheet and will not need to use the other User Input Sheets.
Table of values (“TOV” in the Calculator)
Reference Lists all the rolled-up unit rates used in the Calculator with description of the intended use and items included in the rate (scope).
Assumptions User Input Allows the User to enter general and/or specific information pertaining to the calculation overall and/or specifics of individual Input Sheets.
Seismic User Input This Sheet allows the User to show the break-down of quantities for Seismic easement disturbance.
Infrastructure User Input This Sheet allows User entered quantities for Infrastructure.
Pipelines User Input This Sheet allows User entered quantities for Pipelines.
Gas Processing Facilities and Oil Storage (“GPF and oil storage” in the Calculator)
User Input This Sheet allows User entered quantities for GPF and Oil Storage Facilities.
Water Treatment Plants and Water Transfer Stations (“WTP WTS” in the Calculator)
User Input This Sheet allows User entered quantities for Water Treatment Plants and Water Transfer Stations.
Dams User Input This Sheet allows User entered quantities for Dams.
Sheet Type Attributes, Purpose and Use
Miscellaneous Activities
User Input This Sheet allows User entered quantities for Rehabilitation, Remediation and Land Investigation activities.
Terms and Conditions (“Terms-con”)
Information The Terms and Conditions under which the Calculator can be used. The User must review the Terms and Conditions prior to use. By using the Calculator, the User accepts the Terms and Conditions.
4.3 Contents Sheet
The Contents Sheet is the primary navigation Sheet for the Calculator and allows quick access to the Main Sheet, User Input Sheets and Summary Sheets. The mode of transport is hyperlinks which the user clicks on to access the target element.
Figure 4-1 Contents Sheet
EA and lease details.
Personnel and contact details of the site contact.
The date of the last ERC decision and the amount of ERC last decided by the Department. The amount of ERC last decided is used in the Summary Sheet to show the difference between that amount and the newly proposed ERC amount.
Explanation for any site-specific Project Management and/or Environmental Maintenance and Monitoring values entered to the Summary Sheet, if relevant.
Details and signature of the people who prepared and approved the ERC, where relevant.
The space below the dotted line is for the Department’s use.
CONTENTS
Registration
Summary
Main
Dams Input Sheet
Figure 4-2 Registration Sheet
4.5 Main Sheet
The Main Sheet (Figure 4-3) is the primary Sheet in the Calculator for User entries. For many cases, the User may only need to enter quantities to this Sheet and will not need to use the other User Input Sheets. The key attributes of the Main Sheet are discussed below.
The Main Sheet is grouped by Domain (e.g. Exploration, Dams) and the total for each Domain sums to a Subtotal (Figure 4-4). The sum of all the Domains plus the User Defined Additional items at the bottom of the Sheet is displayed at the top of the Sheet (Figure 4-3).
Figure 4-3 Main Sheet – Top showing Header and beginning of Exploration Domain
REGISTRATION
Tenure Numbers: Site Name:
Site Contact: Position:
Site Address: Phone:
Justification:
If the User enters a Project Management and / or Environmental Maintenance and Monitoring value, please provide justification above.
Date: Date:
Below this line for the Department's use only
Signature of Department
MAIN
Colour Code Key Show This is a toggle button that hides / shows $0 rows in Total Cost column. User Input Cells
User Input - Alternate Rates / justification
Alternate Rates entered by User $1,000 Back to Contents Locked cell - Default Rates or Sum from Input Sheets
Locked cells - blanks Total ERC amount -$ Locked cell - calculations or text
Map ID TOV# Activity / Description User Select From Input
Sheet /
Default /
Calculated
Rate
Names / Item Names
1. Exploration (use this section only for true Exploration activities)
#1.01 Seismic survey rehabilitation in pasture (from Seismic
Input Sheet) total $0 $0
#1.02 Seismic survey rehabilitation in native (from Seismic
Input Sheet) total $0 $0
#1.03 Seismic survey rehabilitation in pasture km $901 $0
#1.04 Seismic survey rehabilitation in native km $1,678 $0
Show / Hide Rows
Figure 4-4 Main Sheet - Subtotal for Exploration Domain
Most of the lines replicate the TOV. The exceptions are where the User is asked to select a distance. In these cases, the Calculator selects the TOV# value corresponding to the User selection. In the example in Figure 4-5, in the top screen shot, the User has selected the first TOV Default Rate in the Growth Media series (#10.13). In bottom screen shot, the User has selected the last TOV Default Rate in the Growth Media series (#10.20)
Figure 4-5 Example of User Selection where TOV Rates are not all in the Main Sheet
Where values are coming from the Input Sheets, this is stated in the Activity / Description column and the quantity cell is hatched out (Figure 4-6). Note: if entries are added to a User Input Sheet they do not need to be re-added to the Main Sheet. The information from the User Input Sheets automatically populates the relevant line of the Main Sheet. If the User Input Sheets are not used, the User must enter all quantities to the Main Sheet.
Figure 4-6 Example of Values coming From User Input Sheet
In the Main Sheet there are instances where an additional User input is allowed in the User input column. For example TJ/day in TOV #7.03 (Gas processing facility, Figure 4-7). In general, these cases are to allow the User to enter a specific value between ranges. For example, with gas processing facilities there is several ranges, the User input allows the User to enter 300 TJ/day rather than enter to the 330 TJ/day line. In these cases, a calculation interpolates between the calculated rates.
A1.8 Additional line item - user to name activity $0
Subtotal >> $0
#10.13 Source, cart and spread growth media (Select Haul
Distance >>) <=200 m GR m3 $2.99
#10.24 Trim, rock rake & deep rip (includes levelling /
landscaping and rip in 1 direction) ha $1,620
#10.12 Onsite remediation of hydrocarbon contaminated soils -
using a cement stabilisation plant m3 $300
#10.20 Source, cart and spread growth media (Select Haul
Distance >>)
#10.24 Trim, rock rake & deep rip (includes levelling /
landscaping and rip in 1 direction) ha $1,620
9. Water Storage Infrastructure (Dams and Tanks) #9.01 Lined dams (from Input Sheet) total $0
#9.02 Unlined dams (from Input Sheet) total $0
Figure 4-7 Example of User Entered Quantity in Main
Use and Scope of Default Rate columns provide information on the intended use and scope of each rate to assist the User in their selections. The words for these columns come from the TOV Sheet.
The sub-totals for each Domain feed to the Summary Sheet.
At the end of each Domain, there are rows to allow the User to define specific activities not included elsewhere. There are also several rows for this purpose in Section 13 of the Main Sheet. The User must enter a description of the rate, the unit of the quantity (e.g. km), the rate (e.g. cost per kilometre) and explanation for the rate. An example is shown in Figure 4-8.
Figure 4-8 Example of Additional Rows for User Defined Entries
Worked examples for entry of Gas Processing Facilities and Camps in the Main Sheet are shown in Section 7.4 and Section 7.7.
4.6 Summary Sheet (including Project Multipliers)
4.6.1 Sheet Description
The Summary Sheet reports the rolled-up total cost for each Domain and the multipliers for environmental maintenance and monitoring, project management and contingency. The only User inputs available in this Sheet are site-specific Project Management and Environmental Maintenance and Monitoring percentage multipliers. If the User enters site-specific values for these items, justification must be added to the space provided in the Registration Sheet.
To allow easier viewing, the User or the Department can hide rows containing zeros (where no inputs were entered) by clicking the Show / Hide Rows button at the top of the sheet (Figure 4-9).
A3.1 Additional line item - user to name activity
A3.2 Additional line item - user to name activity
Figure 4-9 Show / Hide Rows button in Summary Sheet
4.6.2 Project Management Multiplier
The Calculator includes a default multiplier for project management costs, which amounts to
10% of the total ERC from the Domains. The project management multiplier reflects the cost
to government to execute a rehabilitation program for a site and includes:
Decommissioning and rehabilitation plan and feasibility studies.
Health and safety and overall work plans.
Identifying and obtaining permits.
Ongoing management of the project including scheduling, expenditure tracking and forecasting, internal communication, on-site supervision.
Stakeholder (including land-owner, community, municipal government and regulators, media) management.
Consulting and legal costs associated with the above items.
The User can enter a site-specific project management multiplier on the Summary Sheet. If the 10% default value is not used, quotes must be attached to the ERC application and the User must provide justification in the space provided in the Registration Sheet. If a User enters a site-specific project management multiplier, the Calculator applies this value instead of the default.
Figure 4-10 Project Management User Entry
4.6.3 Environmental Maintenance and Monitoring Multiplier
The Calculator includes a default multiplier for environmental maintenance and monitoring costs, which amounts to 5% of the total ERC from the Domains.
The environmental maintenance and monitoring multiplier reflects the costs to government to undertake the following:
post-closure maintenance activities: o Minor repair of rehabilitated features eroded by surface water run-off and high
intensity rain-fall events.
o Revegetation campaigns to rehabilitate areas where vegetation is damaged from drought, fire, animals and/or infertile seed.
o Weed management. o Repair of minor subsidence due to poor backfill operations. o Fence and signage repairs.
post-closure monitoring activities: o Environmental, revegetation and erosion monitoring and assessment. o Ground and surface water monitoring and drainage assessment. o Erosion and surface drainage assessments and inspections across all closure
areas. o Weed mapping and assessment surveys. o Feral animal assessment and control. o Independent contamination auditing and assessment. o Satellite imagery for rehabilitation analysis and reporting purposes. o Preparation of annual environmental reporting and monitoring reporting
requirements and data management and control. o Mobilisation and demobilisation of the monitoring and inspection teams.
The User can enter a site-specific environmental maintenance and monitoring multiplier on the Summary Sheet. If the 5% default value is not used, quotes must be attached to the ERC application and the User must provide justification in the space provided in the Registration Sheet. If a User enters a site-specific environmental maintenance and monitoring multiplier, the Calculator applies this value instead of the default.
4.7 Table of Values (TOV)
The TOV lists the rolled-up unit rates used in the Calculator with description of the intended use and items included in the rate (scope).
To allow ready finding of a rate or key words, a “Find” button is included at the top of the Sheet (Figure 4-11). To find a word or phrase the User clicks on the Find button, types the word or phrase and clicks “OK”. To find the next occurrence of the target word or phrase the user clicks “YES” when prompted. “NO” must be clicked to end the search (Figure 4-12). The example below the User searched for the word “seismic”.
Figure 4-11 Find Button and Search Box in Table of Values
Figure 4-12 Example of highlighted search results and prompt to find next result
4.8 Assumptions Sheet
The Assumptions Sheet allows the User to enter general and/or specific information pertaining to the calculation overall, and/or specifics of individual User Input Sheets. The
User is encouraged to provide information that will assist the Department to understand the processes and concepts behind the inputs.
Examples of information that could be entered are:
Details of infrastructure that has been excluded from the ERC calculation due to an agreement with the landowner, for example, an access track. For full information please refer to the Estimated Rehabilitation Cost (ERC) Guideline (ESR/2018/4425).
Explanation of decisions previously agreed with the Department.
For comments specific to individual Input Sheets, it is recommended the User enter these in the space provided at the top of each Input Sheet.
4.9 User Input Sheets (including Map ID)
The User is not required to use any Input Sheets, as lines for all disturbances are present in the Main Sheet. The User would use Input Sheets if they wish to reflect the specific infrastructure dimensions for the Element present on site.
The structure of each User Input Sheet is similar, with header rows providing the Domain name, hyperlink ‘Back to Contents’, the total cost for the individual Sheet, the total ERC for the site, the colour code legend, notes on the intended use of the Sheet and a section for the User to enter any details specific to the Sheet that may assist the Department in understanding the inputs. An example is shown in Figure 4-13.
The “Use” box at the top of each User Input Sheet informs the User of the intended use for each Sheet.
Figure 4-13 Example of Header of User Input Sheets
The User Input Sheets are to be filled out from left to right and only information relevant to the particular Element needs to be entered. Generally, dimension inputs need to be entered to allow calculation. Where defaults are listed, and no information is entered by the User, a default value will be used in the calculation.
The Main Sheet and each User Input Sheet include a column on the left-hand side of the table to allow the entry of a Map ID (Figure 4-12). The Map ID allows an entry which corresponds to a company-specific GIS (Geographic Information System) or other referencing system. A Map ID must be entered where spatial data is provided which aligns with the line item of the Calculator. The Estimated Rehabilitation Approved form (ESR/2018/4426) dictates where spatial information must or may be provided.
Back to Contents
Colour Code Key User text (below)
User Input Cells
Locked cell - Default Rates
Locked cell - calculations or text
Use: Use this input sheet to show the quantities for Roads, Laydown, Borrow Pits, Camps, Buildings. Click in title cells for tips on specific use. The user is not permitted to change the Unit Rates. If a more specific estimate is required, the user must provide an itemised alternate rate calculation and enter this rate to the Main Sheet.
Figure 4-14 Map ID
4.9.1 Seismic User Input Sheet
The Seismic User Input Sheet allows the User to list individual easements of group easements for 2D and 3D surveys.
The approach to seismic easement rehabilitation has changed in this Calculator. Modern machinery used for seismic survey are designed to minimize impact to the environment and consequently disturbances are not significant and typically the natural environment readily rejuvenates.
The Calculator includes Defaults Rates which allows for inspection and minor re-seeding / repair. The Seismic User Input Sheet allows the user to input the total disturbance lengths for 2D and 3D campaigns. The User can enter the length requiring rehabilitation and this is multiplied by the appropriate re-seed rate depending on whether the land is pasture or native. If the User does not enter the rehabilitation length, the Calculator applies a 5% multiplier to the total length to obtain the length of easement that may require rehabilitation.
A worked example is included in Section 7.1.
4.9.2 Infrastructure User Input Sheet
The Infrastructure User Input Sheet includes disturbances relating to access (e.g. roads), storage and staging (e.g. laydown) and buildings and structures (e.g. camps and communications towers). This is the only Sheet that has the ability to add a row to a table via the Add Roads/Tracks button (Figure 4-15).
Figure 4-15 Add Roads/Tracks Button in Infrastructure
Table A-1 of Appendix A shows the defaults, selections and calculated quantities for the Infrastructure Sheet and a worked example is included in Section 7.2.
4.9.3 Pipelines User Input Sheet
The Pipelines User Input Sheet includes tables for underground and above-ground piping. The primary difference between the calculations for underground and above-ground is the absence of road, rail and stream/creek crossings for above-ground pipes and a smaller default easement width for above-ground pipes (as no trench excavation is required).
SEISMIC 2D
Add Roads/Tracks
The tables allow selection for oil, water and gas and a pipe diameter, together these determine the Default Rates for purging and flushing. The default assumption is that gas pipes are purged, oil pipes are flushed, and water pipes are neither purged nor flushed as the water is beneficially re-used or evaporated in a pond.
The tables allow for the addition of low point drains and high point vents on gathering lines. For low point drains and high point vents on pipelines (not on gathering lines) these must be entered on the main sheet.
For underground pipes, there are three selections for rehabilitation status of the easement:
None - the easement is in the construction phase and the default easement width is the largest.
Partially - the easement is in the operational phase with the easement width reduced from that during construction.
Fully - the easement is rehabilitated or naturally overgrown but is yet to be progressively certified by the Department. For this selection, the default easement width is to allow for ongoing inspection until the easement is signed off.
The rehabilitation of an above-ground pipeline easement is less involved than for an underground pipeline as a single rate is assumed with a narrow easement.
The calculation assumes the same treatment irrespective of pipe material (e.g. steel or high- density polyethylene), however a User can account for items such as potential collapse of the pipe and subsequent subsidence of the land above, by adding quantities for road, rail crossings and/or creek/river crossings.
Table A-2 of Appendix A shows the defaults, selections and calculated quantities for the Pipelines User Input Sheet and a worked example is shown in Section 7.3.
4.9.4 Gas Processing Facilities and Oil Storage Facilities User Input Sheet
The GPF and Oil Storage Facilities (titled GPF and oil storage in the Calculator) User Input Sheet requires the User only to enter quantities for:
Size (capacity, TJ/day) of facility. This number is reference only and does not feature in the calculation.
Number of process modules.
Number of process skids.
Number of portable buildings.
Length of steel piping (m). This is for piping not directly associated with modules and includes, for example, connections between modules.
Number of pipe penetrations to ground.
Length of site electrical cable and tray (m). This is for electrical not directly associated with modules and includes, for example, main feeds and connections between modules.
Area of concrete, bitumen or gravel hardstand.
Mass of incidental waste (t). This is waste not directly associated with modules, buildings, piping.
Length of security fencing.
Volume of top soil (m3).
Purging (TJ/day). Can be set as the capacity of the plant.
Land investigation one-off allocation (typically 1 or a fraction to account for campaigning) and area to investigate (ha).
Quantities for Gas Processing Facilities are entered left to right as is the standard in the Calculator. A worked example for entry of Gas Processing Facilities in the Main Sheet is shown in Section 7.4 and for the GPF and Oil Storage User Input Sheet in Section 7.5.
The calculation for Oil Processing Facilities uses individual components, such as tanks and vessels, with lengths of pipe and electrical, and area to grade and seed. Quantities for Oil Storage Facilities are entered from top to bottom (Figure 4-16) and the costs are tallied in the bottom table (Figure 4-17). The process of entering an Oil Storage Facility is similar to that for a Water Transfer Facility and a worked example for entry of a Water Transfer Facility in WTP WTS User Input Sheet is shown in Section 7.6
Figure 4-16 Oil Storage Facilities Inputs
Figure 4-17 Oil Storage Facilities Costs
4.9.5 Water Treatment Plants and Water Transfer Stations User Input Sheet
The Water Treatment Plants and Water Transfer Stations (called “WTP WTS” in the Calculator) User Input Sheet requires the User to enter only quantities for:
Size (capacity, ML/day) of facility. This number is reference only and does not feature in the calculation.
Number of process modules.
-$
Total disturbance area for final grade and seed (pasture) ha 3,035$
Total disturbance area for final grade and seed (native) ha 5,255$
OSF1
Remove pig launcher / receiver -$
Number of on-site constructed buildings.
Number of portable buildings.
Length of steel piping (m). This is for piping not directly associated with modules and includes, for example, connections between modules.
Number of pipe penetrations to ground.
Length of site electrical cable and tray (m). This is for electrical not directly associated with modules and includes, for example, main feeds and connections between modules.
Area of concrete, bitumen or gravel hardstand.
Mass of incidental waste (t). This is waste not directly associated with modules, buildings, piping.
Length of security fencing.
Volume of top soil (m3).
Land investigation one-off allocation (typically 1 or a fraction to account for campaigning) and area to investigate (ha).
Quantities for Water Treatment Plants are entered left to right as is the standard in the Calculator. The process of entry for a Water Treatment Plant is similar to that for a Gas Processing Facility. A worked example for Gas Processing Facilities are shown in Section 7.4 and Section 7.5.
The calculation for Water Transfer Stations uses individual components such as tanks and vessels, with lengths of pipe and electrical, and area to grade and seed. Quantities for Water Transfer Stations are entered from top to bottom (Figure 4-18) and the costs are tallied in the bottom table (Figure 4-19).
Figure 4-18 Water Transfer Stations Inputs
Figure 4-19 Water Transfer Stations Costs
4.9.6 Dams User Input Sheet
The Dams User Input Sheet includes User input tables for lined and unlined dams. The inputs for each water structure are similar and include basic dimensions, as shown in Figure 4-20. The Size or Capacity (megalitres, ML) does not feature in the calculation, rather it provides context. The key inputs for the calculation are circled in Figure 4-18. If the User does not have these quantities, they should use the Default Rates in the Main Sheet.
WATER STORAGE FACILITIES
-$
1 Total disturbance area for final grade and seed (pasture) ha 3,035$
2 Total disturbance area for final grade and seed (native) ha 5,255$
3 Vertical, Steel, Open-top, Liner Base 0.14 ML 3,320$
WSF 1
Activity 0
Figure 4-20 Dams Inputs
The Dams calculation includes a Contaminated Land Investigation cost which is based on the input shown in Figure 4-21 and the area of the Dam entered by the User. The input shown below accounts for “campaigning” whereby multiple dams could be investigated during one mobilization. This concept is explained further in Section 4.9.7.2.
Figure 4-21 Contaminated Land Investigation for Dams – One off Cost Input
Salt management is included in the Main Sheet only (see Section 6.1).
Table A-3 of Appendix A shows the defaults, selections and calculated quantities in the Dams User Input Sheet.
4.9.7 Miscellaneous Activities User Input Sheet
The Miscellaneous Activities User Input Sheet requires the User to enter simple quantities such as area and number. The following User Input tables are included in this Sheet:
Land investigations.
Long distance carting of top soil.
4.9.7.1 Miscellaneous Rehabilitation and Rehabilitation
The Miscellaneous Rehabilitation and Maintenance table requires only the names of the area and basic inputs, such as area. These are summed and multiplied by the Default Rate (circled in Figure 4-20). As with all the User Input Sheets, use of the Input Sheet is not mandatory and all the Default Rates for this table are in the Main Sheet.
LINED DAMS
DAM DETAILS
Wall Height (above
ground surface) (m)
Wall width at
Figure 4-22 Example of Input Table in Miscellaneous Activities
4.9.7.2 Preliminary and Intrusive Site Investigations
The Calculator has Default Rates for contaminated land investigations, both preliminary and intrusive site investigations. These Default Rates must be considered for any project that:
Produces one or more hazardous contaminants in a concentration with the potential to cause serious or material environmental harm and a person, animal or other part of the environment may become exposed to the hazardous contaminant(s).
Includes notifiable activities; and/or has contaminated land on the environmental management register (EMR) or contaminated land register (CLR).
Preliminary Site Investigation
The preliminary site investigation unit rate is a one-off cost. A preliminary site investigation in the context of a facility or site closure is typically a part of planning activities and aims to identify areas of known, suspected or reasonably probable contamination resulting from the petroleum and gas operations. The preliminary site investigation comprises a review of the site setting, site history, operational history (including any accidents and incidents), hazardous liquids and solids storage schedules and sources of potential impacts and receptors.
To apply a cost for a preliminary site investigation, the User selects Y in the “Preliminary Site Investigation needed?” column Figure 4-23.
MISCELLANEOUS REHABILITATION AND MAINTAINENCE (for areas not included elsewhere)
Map ID Name of Area
Trim, rock rake
& deep rip (ha)
TOV#: #10.24 #10.25 #10.26
Total cost -$ -$ -$
Figure 4-23 Preliminary Site Investigation Entry
Intrusive Site Investigations
An intrusive investigation would be targeted and may not be required for all contaminated or preliminary investigation areas. The intrusive investigation rate should be applied considering risk, site history, past incidents and the planned rehabilitation program. An intrusive investigation should be considered if a site has contaminated land on the EMR or CLR, and if scalping and disposal of contaminated material is not accounted for in key areas with potential for contamination (e.g. process areas, maintenance yards, go lines).
There are two Default Rates for intrusive site investigations - a one-off cost (termed “Separate Area” in the Calculator) and per area cost. The User must add entries for both these rates to cost an intrusive site investigation.
One-Off Cost for Site Investigations
The approach to estimating costs for site investigations recognises that most investigations of this nature comprise a single campaign (one mobilisation) taking in multiple areas. The one-off cost allows for planning and preparation, ongoing project management, health and safety plans, work plans and reporting. A combination of the factors outlined above (risk, rehabilitation program, site history and grouping and relative proximity of infrastructure) must be considered in determining the number of one-off costs to apply. Examples of areas that may individually comprise one campaign are:
Service facility area – fuel or chemical stores, workshop, vehicle washdown, sewage treatment.
Processing plant – oil storage.
The User should enter a 1 for the one-off entry demonstrating that the areas described in the line will be investigated in one campaign1. The Calculator defaults to 1 when an area is added (Figure 4-24).
Figure 4-24 Example of Use of One-off Cost
1 These areas were termed “cluster” in the Financial Assurance calculator.
Land Investigations
TOV#: #10.14
Separate area?
(Or portion) Width (m) Length (m) Diameter (m) User Area (ha)
Preliminary site
1 Washdown area 0.5 100.0 20.0 Y 0.20 0.20 15,000$
Area
The User can enter a fraction of 1 if they want to list individual areas that will be investigated in one campaign (Figure 4-25).
Figure 4-25 Example of a Fraction Entry of One-off Cost
By Area Cost for Site Investigation
The by area rate accounts for activities undertaken on-site. The rate includes costs for field staff to collect soil samples, sampling equipment, consumables and laboratory analytical costs.
The User can describe the area for a land investigation by entering width and length or diameter or the area (Figure 4-26). This recognizes that Users will have different quantity types. Some Users may use GIS that outputs area and others may be a measure of length and width off a plan. In this example, the hierarchy is User Entered Area then Width and Length and then Diameter. If length, width and diameter are added, the Calculator uses length and width and ignores diameter. The Calculated Area column shows the calculation of area based on the User Entered dimensions and if a value is entered directly to the User Area column, the Area for calculations column will default to that entry (see Figure 4-26 for examples).
The per area rate is applied only to the area to be investigated. For example, a tank farm within a processing facility – in this case only the tank farm area is entered.
Figure 4-26 Land Investigation Input Cells showing Options for Defining the Area
4.9.7.3 Remediation of Contaminated Areas
This table accounts for any known contamination on the site for example disposal of oil impacted soil and asbestos.
4.9.7.4 Long Distance Haul
A long-distance haul User Input table is available for top soil (Figure 4-27). The User must use this table if top soil is not within 6 km of the intended use area. The distance is selected from the drop-down menu (circled) which has increments extending up to 200 km. The User enters the mass of material required and this is multiplied by the distance and Default Rate to obtain the total cost for that area. An Alternate Rate can be added in the standard way for the Calculator.
Area
Separate area?
(Or portion) Width (m) Length (m) Diameter (m) User Area (ha)
Preliminary site
Processing area 1.0 30.0 N 0.07 0.07
The Default Rates for long-distance haul is for transport only and does not include the purchase price for the material. The User must enter the quantity of top soil as a separate line item in the Miscellaneous Activities Domain of the Main Sheet.
Figure 4-27 Long Distance Haul of Top Soil
Information on Rates
5 Information on Rates
5.1 Bottom-up, First Principles Calculation Method
The Unit Rates for an activity are constructed using “bottom-up, first-principles” whereby costs for relatively complex activities are built starting from basic singular values such as cost ($) per hour for machinery hour and productivity of that machinery. The build of Unit Rates is illustrated in Figure 5-1.
The bottom-up, first principles method is generally:
A scope for an activity is defined.
Productivity values are used to estimate the time an activity may take.
The time is multiplied by an hourly rate (encompassing Labour and Equipment rates) to obtain a cost for that activity.
Labour Costs, Equipment Costs and Productivity Rates are the most fundamental values (base rates) underpinning the Unit Rates and these are discussed further below.
5.2 Labour Costs
The Labour costs (e.g. cost per hour for equipment operator) are calculated by adding the following allowance to a base rate:
Annual leave
Operating hour proportion
5.3 Equipment Costs
The Equipment costs (e.g. cost per hour for an excavator) are built assuming:
The capital (ownership) cost of new equipment is depreciated over a much longer life within the Calculator than what it is likely for used equipment.
The new equipment would be depreciated (and used) over several contracts by a typical earthmoving contactor unless they are long term contracts.
Operating time of 3,723 hours per year for closure works.
The new equipment ownership (depreciation) rates per hour are anticipated to be similar to used equipment ownership (depreciation) rates per hour a contractor would apply to a typical earthmoving contract based on the typical age of used equipment proposed for the contract.
The following depreciation periods for new equipment are used in the Calculator rates:
Dozers 35,000 hours
Graders 55,000 hours
Excavators 54,000 hours
Haul Trucks 75,000 hours
The Equipment costs are calculated by adding the following allowance to a base rate:
Rolled-up labour cost as described above.
Fuel is a set price per litre. The fuel cost per hour is calculated using fuel consumption rates from the Caterpillar™ manual.
Preventative maintenance and wear.
5.4 Productivity
Productivity (e.g. cubic metres of soil a dozer can push over a specific length range) defines the performance capability of a machine or equipment and is used to estimate the time an activity may take so that an hourly rate can be applied to obtain a cost for that activity. Productivity rates are generally sourced from the Caterpillar™ earthmoving manual.
5.5 Scope and Unit Rates
The scope for a Unit Rate is the sequence of events or activities (which could be thought of as sub-activities) required to be undertaken to complete an Activity. For example, sourcing top soil comprises loading the soil, transporting the soil and placing the soil. Each activity has a Unit Rate and these are summed to obtain the Unit Rate for the Activity.
Depending on the complexity of the Activity, Unit Rates either are a rate in the TOV (or Default Rate) directly or are combined with other unit rates to form a rate in the TOV. Instructions on appropriate application of each rate in the TOV are included in the Use and Scope and Key Assumptions columns in the TOV Sheet.
The scope for each activity was developed by a team of engineers with decommissioning and rehabilitation engineering cost estimation experience ranging from 20 to over 35 years. The base costs (e.g. cost per hour for an excavator) are based on contemporary third-party rates.
Figure 5-1 Inputs to Table of Values (Build-up of Unit Rates)
5.6 Alternate Rates
Users must review all Default Rates and ensure they are applicable to their site conditions. If not, they can specify an Alternate Rate and insert this rate into the Calculator. Alternate rates and additional items include third-party quotes or contracted rates. Users must provide justification for any Alternate Rates or additional items provided in the Calculator.
Third-party quotes or contracted rates used in the Calculator must meet the requirements in the ERC Guideline (ESR/2018/4425).
Users must provide justification for any Alternate Rates or additional items provided in the Calculator.
5.7 Contractor Rate Inclusions
The contractor rates (e.g. $/h for an excavator) that form the basis of the Unit Rates include built-in allowances for:
Health and safety plans and personnel protective equipment.
Passenger vehicles / utilities for crew, support staff (e.g. fitters) and supervisors.
Service vehicles for fueling, oiling and greasing primary machinery.
Ancillary equipment such as power generators, air compressors and hoses, lighting units.
Signage and fencing.
Maintenance personnel and tools.
Temporary accommodation camps, workshops, offices and stores and equipment and consumables therein.
Focus Items
6 Focus Items
6.1 Water and Salt Management
Water and salt management costs are captured in the Main Sheet. For water management, Default Rates are available for:
Processing of produced water via operation of reverse osmosis plant (per ML). If this option is selected, the User must also select Default Rate #8.15 to account for the mobilization of a portable reverse osmosis plant or proved justification as to why it is not required (e.g. ponds are connected to an existing reverse osmosis plant).
Evaporate water from brine pond using the sun (per pond).
Enhanced evaporation of water from brine pond using fine mist spray (per pond).
The User must provide explanation for the treatment used. For example, if solar evaporation is used, the User must demonstrate the water volume can be managed in a reasonable (for rehabilitation) time-frame and costs for management of the remaining material have been included (e.g. by adding quantities to the sludge table) or are not required (e.g. evaporation water storage).
For salt management, the User need only enter the mass of salt anticipated from produced water (and any other sources) to line #8.19 (Salt Disposal – Loading). The Calculator multiplies this mass by the default distance to landfill for salt (200 km) and the Default Rate (tonnes-kilometres) to calculate the transport cost and by the gate fee (cost of entry of salt to a landfill) to calculate this cost.
If other water and salt management approaches are being used, the User must provide information to support the entries in the Additional Items table rows in section 8. Water Treatment Plants and Transfer Stations table or in the Additional Activities section at the bottom of the Main Sheet.
Figure 6-1 Water and Salt Management in Main Sheet
6.2 Pasture and Native Seed
Most activities require re-vegetation of the land surface and the Calculator allows for native or pasture type seed. The Calculator typically includes a drop-down menu to allow the
#8.15 Mobilisation of portable reverse osmosis unit to ponds
(not connected to existing ROP) pond $45,455
#8.16 Reverse osmosis treatment (by portable or fixed ROP) ML $2,680
#8.17 Treatment of residual pond water (brine ponds only) by
solar evaporation pond $3,631
#8.18 Treatment of residual pond water (brine ponds only) by
enhanced evaporation (atomiser) pond $51,297
#8.19 Salt Disposal - Loading tonne $8.9
#8.20 Salt Disposal - Transport 0 t-km $0.07
#8.21 Salt Disposal - Gate Fee 0 tonne $95
Focus Items
selection of native or pasture seed. The Calculator applies the appropriate rate to area required to be seeded. If an area covers both native and pasture land, the User must input separate lines.
6.3 Mobilisation, De-mobilisation and Fleet Size
Mobilisation and demobilisation is the process of transporting earthmoving machinery to the site for the rehabilitation work and transporting the machinery back to the supply centre. Typically, the supply centre for earthmoving equipment (e.g. excavator) is a major centre such as Brisbane or Rockhampton. Smaller equipment may be available in places such as Roma. The mobilization / demobilization costs reflect the effort required for safe transport earthmoving equipment which typically includes floats and convoys.
The Calculator has mobilization / demobilization rates for small, medium and large fleets and in distance ranges of <=150 km, >150 km and <=500 km, > 500 km and <=1000 km and > 1000 km (Figure 6-2). The Default Rates allow for transport both ways and therefore the User should use the one-way distance (from supply centre to source) when determining the appropriate rate.
Table 6-1 provided guidance on fleet size selection.
Table 6-1 Fleet Sizes
Fleet Size Activities
Small Well pads, smaller track and road and laydown rehabilitation projects (<= 5 km total length and <= 1 ha), single and/or small dams (<= 1 ML and < 5 dams) and small facilities (e.g. temporary drilling camps).
Medium Moderate size track and road and laydown rehabilitation projects (> 5 km and <= 50 km total length and <= 10 ha), moderate size dams (<= 100 ML) and moderate size facilities (e.g. camps of <= 100 person capacity camp, <= 50 TJ/day gas processing plants and <= 6 ML/day water treatment plants).
Large Large size track and road and laydown rehabilitation projects (> 50 km total length and > 10 ha), large size dams (> 100 ML) and large size facilities (e.g. camps of > 100 person capacity camp, > 50 TJ/day gas processing plants and > 6 ML/day water treatment plants).
The Default Rates includes costs for utility and service vehicles to support the earthmoving equipment.
HEAP LEACH PILE REVEGETATION
Area requiring
101.0 100.0 1.0 145,135$
Figure 6-2 Mobilisation / Demobilisation Default Rates
6.4 Haulage Distances
The haulage distance is the round-trip distance to/from a source of material (e.g. top soil) or to an end-use / disposal location. (Note this is different to the mobilization / demobilization costs).
11. Mobilisation and Demobilisation
km) Small fleet for Well Pads, Roads, Pipeline
Easements
<= 500 km) Small fleet for Well Pads, Roads, Pipeline
Easements
to <= 1000 km ) Small fleet for Well Pads, Roads,
Pipeline Easements
Item $115,440
km) Small fleet for Well Pads, Roads, Pipeline
Easements
km) Large fleet for Facilities and Dams Item $99,450
#11.06 Mobilisation & Demobilisation (Distance to site > 150 to
<= 500 km) Large fleet for Facilities and Dams Item $182,325
#11.07 Mobilisation & Demobilisation (Distance to site > 500 km
to <= 1000 km ) Large fleet for Facilities and Dams Item $344,760
#11.08 Mobilisation & Demobilisation (Distance to site > 1000
km) Large fleet for Facilities and Dams Item $424,320
#11.09 Mobilisation & Demobilisation for total ERC amounts
less than $1,000,000 (total) Item $3,556
Worked Example
7 Worked Example
7.1 Seismic Easements
To calculate the cost for rehabilitation of seismic easements via the User Input Sheet, the User should follow the steps below.
1. 2D. Enter the length of 2D easement. In the example below, two groupings are entered of the same length (100 km).
2. The Calculator multiplies the User Entered length by a default 5% to calculate the length of 2D easement to be rehabilitated (first line in example below). The User can over-ride this default by directly entering the easement length to be rehabilitated (second line in example below). The screen shot below shows the calculated 5.0 km length over-ridden by the User Entered 3.0 km.
3. If the User leaves the “Proportion in Pasture” column blank, the Calculator defaults the length requiring rehab to native. The User can make the land type pasture by entering 100% for that line (as in the first line in the example below). The User can also enter a proportion for a line and the Calculator splits the length between native and pasture (the second line in the example below).
4. The length requiring rehab is multiplied by the rate for pasture to obtain the length of 2D easement requiring rehab in pasture and by the rate for native to obtain the length of 2D easement requiring rehab in native.
5. 3D. For 3D the User enters the total transverse and cross lengths and the Calculators adds these to obtain the total seismic easement length. In the example
SEISMIC 2D
SEISMIC 2D
SEISMIC 2D
Seismic 2D Group 2 100.0 3.0 30% 70% 0.9 2.1
SEISMIC 2D
Seismic 2D Group 2 100.0 3.0 30% 70% 0.9 2.1
Worked Example
below, the total length of easement is the same (100 km). In the fourth line, only the cross length is entered which would be an error – an example such as this either requires transverse length or should be in the 2D table.
6. The Calculator multiplies the User Entered length by a default 5% to calculate the
length of 3D easement to be rehabilitated (first, third and fourth lines in example
below). The User can over-ride this default by directly entering the easement length to
be rehabilitated (second line in example below). The screen shot below shows the
calculated 5.0 km length over-ridden by the User Entered 3.0 km in the third line.
7. If the User leaves the “Proportion in Pasture” column blank, the Calculator defaults the length requiring rehab to native (as in the first and fourth lines in the examples below). The User can make the land type pasture by entering 100% for that line (as in the second line in the example below). The User can also enter a proportion for a line and the Calculator splits the length between native and pasture (the third line in the example below).
8. The length requiring rehab is multiplied by the rate for pasture to obtain the length of 3D easement requiring rehab in pasture and by the rate for native to obtain the length of 3D easement requiring rehab in native.
9. The Summary table reports the total length of 2D and 3D easement and the total length to be rehabilitated in native and pasture. The lengths to be rehabilitated are multiplied by the appropriate Default Rate to obtain the total cost to rehabilitate the total length of easement in each land type and these are summed to get the total cost for seismic.
SEISMIC 3D
Seismic 3D Group 1 50.0 50.0 100.0 100% 0.0 5.0
Seismic 3D Group 2 50.0 50.0 100.0 3.0 100% 0% 3.0 0.0
Seismic 3D Group 3 50.0 50.0 100.0 30% 70% 1.5 3.5
Seismic 3D Group 4 100.0 100.0 100% 0.0 5.0
SEISMIC 3D
Seismic 3D Group 1 50.0 50.0 100.0 100% 0.0 5.0
Seismic 3D Group 2 50.0 50.0 100.0 3.0 100% 0% 3.0 0.0
Seismic 3D Group 3 50.0 50.0 100.0 30% 70% 1.5 3.5
Seismic 3D Group 4 100.0 100.0 100% 0.0 5.0
SEISMIC 3D
Seismic 3D Group 1 50.0 50.0 100.0 100% 0.0 5.0
Seismic 3D Group 2 50.0 50.0 100.0 3.0 100% 0% 3.0 0.0
Seismic 3D Group 3 50.0 50.0 100.0 30% 70% 1.5 3.5
Seismic 3D Group 4 100.0 100.0 100% 0.0 5.0
SEISMIC 3D
Seismic 3D Group 1 50.0 50.0 100.0 100% 0.0 5.0
Seismic 3D Group 2 50.0 50.0 100.0 3.0 100% 0% 3.0 0.0
Seismic 3D Group 3 50.0 50.0 100.0 30% 70% 1.5 3.5
Seismic 3D Group 4 100.0 100.0 100% 0.0 5.0
Worked Example
10. The User can enter and Alternate Rate and justify it in the Rational for Alternate Rate column.
7.2 Tracks and Roads (Infrastructure Input Sheet)
To calculate the cost for rehabilitation of a road using the User Input Sheet rather than the Main Sheet, the User should follow the steps below.
1. Enter the name of the road (or group of roads) and the length of the road (or total length of the group of roads). Enter the width of the road or leave this cell blank. If the User leaves the cell blank, the default quantity (6.0 m in this example) is used in the calculation.
2. Select the surface covering of the Road from the drop-down menu. The total length defaults to the next column (Length of Road surface covering to be removed) though the User can enter a site-specific length with justification.
SUMMARY
Totals
Length (km) Default Rate Alternate Rate Total
Cost of pasture rehab 10.4 $901 9,375$
Cost of native rehab 15.6 $1,678 26,184$
Total rehab cost 35,559$
TOV #
Default value 6.0
Map ID Name Road or Group of Roads Width (m) Total Length (km) Type of Surface Covering
Earthen
Earthen
Total Length (km) Type of Surface Covering
Length of Road
3. The User can enter a thickness for the surface covering or accept the defaults (by leaving the cells blank). The defaults reference the surface covering selected in the previous step. The Calculator calculates the volume of material to remove (90,000 m3 for the gravel road in the example below).
4. From the drop-down menu, the User selects the distance to haul the surface cover material for disposal or re-use. The Calculator multiplies the appropriate Default Rate for haulage by the volume to haul to calculate the total cost for removal.
5. The next section is an optional section for replacement of surface covering. Examples of where this may occur are a) the road was to be retained but contaminated material had to be removed and b) the road was earthen but the agreement with the land-owner is to install a hardstand road. The default length of surface covering to replace is the length of the road (second line in the example below) and the User must enter zero if material is not to be replaced (first line in the example below).
From the drop-down menu, the User selects the distance to the source of surface cover material. The Calculator multiplies the appropriate Default Rate for haulage by the volume to haul to calculate the total cost for replacing surface cover.
ROAD DIMENSIONS AND COVER TYPE REMOVAL OF SURFACE COVERING
Type of Surface Covering
200.0 90,000
Haul distance to surface covering (km) Unit Rate # Unit Rate
Cost to remove
>1500 m to <=2000 m #2.14 3.97$ 357,558$
-$
6. Grade and seed is calculated in a similar manner to other Domains. The Default area to seed is the total length by the width of the Road but the User can enter a site- specific area with justification. The User selects the type of seed from the drop-down menu and the Calculator places the area in the appropriate column. The Calculator multiplies the Unit Rate for the seed-type by the area for seeding to calculate the total cost for seeding.
7. The Calculator sums all the totals described above to calculate the total cost for the element (a Road in this case), sums all the Elements to get the total cost for the Disturbance type and divides the total cost by the total length to obtain the cost per kilometer (circled).
7.3 Pipelines
To calculate the cost for rehabilitation of an underground pipeline using the User Input Sheet rather than the Main Sheet, the User should follow the steps below.
1. Enter the name or identifying reference for the pipeline of group of pipelines (e.g. Surat East Gathering Lines or Roma to Emerald Water Line)
2. From the drop-down menu select the fluid being transported in the pipe. This selection determines the type of purging / flushing.
3. Enter the total length of the pipeline(s). If pipelines are co-located: a. The lengths for different fluid types must be on separate lines so that the
purging/flushing rates and cut and cap can be correctly applied.
REPLACEMENT OF ROAD COVER
Cost to replace
blue metal ($)
0.0 0.0 0 >1500 m to <=2000 m Return #2.25 3.97$ -$
100.0 100.0 90000 >1500 m to <=2000 m Return #2.25 3.97$ 357,558$
100 100 90000 $357,558
0.0 0.00 -$ 0.0 Native 0.0 0.0 -$
100 60 $23,109 60 $218,100
Cost to re-seed
b. The total easement length need only be the length of the longest pipe 4. The User can enter the length of pipe to be purged or accept the calculation which
defaults the length of the pipe. 5. Enter the pipeline diameter which is used to calculate volume for purging / flushing. 6. The Calculator selects the appropriate purging / flushing rate depending on the fluid
type selected by the User and the diameter of the pipe.
7. The User enters the number of low point drains and high point vents for gathering lines and the calculator multiplies by the rate.
8. The User enters the number of low point drains and high point vents for the pipeline in the Main Sheet in #6.101.
9. The User enters the number of roads, creeks/rivers and rail-lines the pipeline crosses.
10. The Calculator multiplies the number of each crossing by the appropriate rate which takes account of diameter.
11. From the drop-down menus, the User selects status of rehabilitation for the easement. The options are:
a. None – used for easements in the construction state and where a wider area requires rehabilitation.
b. Partially – used for easements in the operational state whereby the width required during construction is reduced for the operation stage.
c. Rehabilitated – used for easements that are restored to the natural condition and requires inspection only. The User can provide photographic evidence to support this status selection.
12. The User can enter an easement width of accept the default assigned according to the rehabilitation status.
13. The User can enter a length of the pipeline to be rehabilitated but typically the default will be the total length of the easement. If a User enters a shorter length, justification must be given.
14. The User selects the seed type from the drop-down menu.
PIPELINES (UNDERGROUND)
PIPELINE DETAILS
# Map ID Pipeline Name / Name Grouping Fluid Pipeline length (km)
Pipeline /
#6.102 #6.103
$12,020 $12,020 $28,181
Low Point Drains High Point Vents Low Point Drains High Point Vents
# Road
Creek / River
15. The Calculator multiplies the area required for rehabilitation by the appropriate rate to obtain the cost for grade and seed of the easement.
The Calculator sums all the totals described above to calculate the total cost for the pipeline.
7.4 Gas Processing Facility in Main Sheet
The following steps should be followed for entering Gas Processing Facilities to the Main Sheet. This process is similar for Water Treatment Plants.
1. The standard method is to simply add a quantity to the Default Rate line for the appropriate size plant.
2. The User should then enter some words in the “Rationale for Alternate Rate / Facility Names / Item Names” column to inform the Department of the specific facility.
3. Another method is to enter the specific size of the facility to the line shown below. The User must still enter the quantity and description.
7.5 Gas Processing Facility in User Input Sheet
The following steps should be followed for entering Gas Processing Facilities to the User Input Sheet. This process is similar for Water Treatment Plants.
1. The Calculator uses basic entries such as number of modules to calculate cost. These quantities may come from design or as-built drawings or registers. If the User does not have this information, they should use the Default Rates in the Main Sheet. The User enters:
a. The name of the facility. b. Capacity in TJ/day. This quantity is for reference only, it does not feature in
the calculation. c. The number of modules (these are typically large process modules such as
dehydrators and gas compressors. d. The number of skids (these are smaller unit such as generators) e. The number of on-site constructed buildings (these are typically steel beam
and cladding). f. The number of portable buildings (typically small offices units or ablution
blocks).
#7.04 Gas processing facility Stand-alone conv gas
compressor 1 facility $5,737 $5,737
Lone pine compressor
#7.05 Gas processing facility 10 TJ/day 2 facility $193,000 $386,001 Surat Facility
#7.03 Gas processing facility of user entered TJ/day 100 TJ/day 1 facility $1,045,576 $1,045,576 Surat A facility
Worked Example
2. The User then estimates the quantiles for the length of piping and electrical cable / tray. These quantities are between modules and skids and general site runs. Piping and electrical quantities directly associated with modules and skids (i.e. on the module or skid itself) are included in the module and skid inputs and do not need to be included in the inputs below. The number of pipe penetrations is to capture those that will need to be cut and capped (e.g. where a line from a gas field breaches the surface).
3. Aside from the mass of incidental waste column and length of fencing, the inputs below are for surface covering and land rehabilitation. In the example below, the facility has a concrete apron for parking and gravel covering the area around the process units. The remainder is earthen or vegetation. Concrete pads and footings associated with buildings and modules are included in those rates and do not need to be added to the area of concrete hardstand column below.
The area for grade and seed is typically the area enclosed by the facility fence-line but maybe more if there are disturbed areas outside the fence line not captured elsewhere (e.g. a gravel parking area outside the fence). The grade and seed area may be smaller if areas within the fence line are rehabilitated. The volume of top soil accounts for any growth media needed to encourage re-growth. In arid regions this may not be necessary.
The mass of incident waste is that not associated with modules, skids and buildings and may include items such as demolished buildings where the rubble is yet to be cleared. The User is not obliged to enter a value to this column.
4. For the land investigation, the User enters the one-off cost based on how many discrete areas requiring separate campaigns will be required. For a gas processing facility, the investigations will likely be covered in one visit, so the input is 1. If the facility is small and other areas requiring investigation (e.g. a dam) are close-by, the User may justify a fraction (e.g. 0.5) indicating the one campaign will cover other areas.
The area for the by area cost is just the area targeted for investigation (e.g. fuel storage area), not the entire facility area.
GAS PROCESSING FACILITY DETAILS
Default:
Map ID Name of Gas Processing Facility Size (TJ/day) # of Modules # of Skids
# of On-site constructed
Length of steel
Mass of Incidental
Worked Example
5. The Calculator uses default multipliers to calculate the quantities shown below and these are used to calculate cost.
6. The User Entered quantities are multiplied by the Default Rates (which are not changeable) to obtain the cost for each activity (e.g. removal of process modules) and summed to obtain the total cost for the facility and Domain. The Default Rates include decommissioning (e.g. electrical and mechanical disconnection), demolition, transport (e.g. of steel to scrap yard) and where applicable, gate fee (steel gate fee is set to zero, concrete is set to gate fee rate).
7.6 Water Transfer Facility
The following steps should be followed for entering Water Transfer Facility to the User Input Sheet. This process is similar for Oil Storage Facilities.
1. The User enters inputs vertically in this Sheet. The Calculator uses basic entries such as number of 0.6 ML vertical steel tanks to calculate cost. These quantities may come from design or as-built drawings or registers. If the User does not have this information, they should use the Default Rates in the Main Sheet. The name of the facility and Map ID (if relevant) are entered at the top as shown.
Land investigation
one off
Land investigation
Size (TJ/day) Modules Skids
ground
penetrations
33$ 14$ 0.14$ 77$ 20$ 5,255$ 3.94$ 500$ 33,819$ 4,040$
Concrete
Land investigation
one off
Land investigation
($)
$33,488 $0 $1,374 $7,708 $20,000 $15,765 $17,750 $250,000 $33,819 $808 $772,418
$0 $0
$808 $772,418
Worked Example
2. The area of grade and seed for the specific vegetation type is entered near the top and then the User runs down the list entering the appropriate quantities for tanks.
3. Near the bottom of the column, the User enters the number of pumps, length of piping and number of portable buildings.
4. At the bottom of the column, the User Entered quantities are multiplied by the Default Rates (which are not changeable) to obtain the cost for each activity (e.g. decommission and remove tanks) and summed to obtain the total cost for the facility and Domain. The Default Rates include decommissioning (e.g. electrical and mechanical disconnection), demolition, transport (e.g. of steel to scrap yard) and where applicable, gate fee (steel gate fee is set to zero, concrete is set to gate fee rate.
7.7 Camps in Main Sheet
The following steps should be followed for entering Camps to the Main Sheet.
1. The standard method is to simply add a quantity to the Default Rate line for the appropriate size (by person capacity) and type (temporary or permanent) camp. Temporary camps are those associated with drilling activities and attached to some facilities. Temporary camps are defined by the general absence of hardstand (i.e. mostly gravel or earthen / vegetation), absence of recreational facilities and are portable buildings. Permanent camps are more comprehensively appointed.
2. The User should then enter some words in the “Rationale for Alternate Rate / Facility Names / Item Names” column to inform the Department of the specific facility.
WATER STORAGE FACILITIES
-$
Elements Size Unit Unit Rat

Date post:	28-Mar-2022
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User Guide for Estimated Rehabilitation Cost Calculator ...

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