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| Resource Library > Technology Transfer > Programs and Initiatives > Enhanced In Situ Anaerobic Bioremediation > Cost Estimating Tool |
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Available for free online, is the Tri-Service Cost Estimating Tool for Enhanced Anaerobic Bioremediation of Chlorinated Solvents. Funded by the Environmental Security Technology Certification Program (ESTCP), the Naval Facilities Engineering Services Center (NFESC), and AFCEE, this cost estimating tool is intended to assist Department of Defense (DoD) Restoration/Remedial Project Managers (RPMs) in evaluating the cost of implementing enhanced anaerobic bioremediation for chlorinated solvents in groundwater. These costs may be useful for comparing various system configurations, or for comparison to alternative remedial technologies (e.g., groundwater extraction, air sparging, permeable reactive iron barriers, or chemical oxidation). For example, this information may be useful to the RPM for comparison of remedial alternatives in feasibility studies, corrective measures studies, or engineering evaluation/cost analysis studies. Costs also may be compared between alternative systems for enhanced bioremediation; however, this cost estimating tool is not intended for design purposes. Costs calculated by this model should be considered order-of-magnitude estimates suitable for comparison purposes only.
Download Instructions
The user may download the cost estimating tool zip file to any designated directory on their computer. To start using the cost tool, extract the cost model Excel® template file and the user's manual to a "C:\Cost Estimating Tool" subdirectory. The cost model can be used in any subdirectory; however, the HELP function in the model will link directly to the user's manual only when the manual is located in the "C:\Cost Estimating Tool" subdirectory. The model may then be started by simply opening the cost model Excel® template file. The user must be able to enable macros when opening the Excel® template file. If the user encounters problems opening the model template file, refer to the users manual for further instruction regarding macro security settings in Excel®.
When using the cost model, the user may access the model user's manual by selecting the HELP button on any page of the model program. This user is encouraged to review the manual in its entirety prior to using the cost estimating model.
Enhanced Anaerobic Bioremediation
Enhanced anaerobic bioremediation has emerged in recent years as a viable and cost-effective remediation strategy for chlorinated solvents in groundwater. Advantages include complete mineralization of the contaminants in situ with little impact on infrastructure, and relatively low cost compared to more active engineered remedial technologies. The addition of an organic substrate to an aquifer has the potential to stimulate microbial growth and development, creating an anaerobic environment in which rates of anaerobic degradation of chlorinated solvents may be enhanced.
A variety of organic substrates have been applied to the subsurface to promote anaerobic degradation of chlorinated solvents to innocuous end products. This cost estimating tool estimates life-cycle costs for commonly used substrates that can be injected into the subsurface either by installation of injection wells or by use of direct-push techniques.
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Step 1: Site Description (Conceptual Site Model)
User Input
- Contaminant Data
- Hydrogeology
- Geochemical Data
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Step 2: Select System Configuration (Design)
User Input
- Treatment Configuration and Cell Size
- Substrate Type
- Soluble Substrate Systems
- Slow-Release Substrate Systems
- Design Life
- Number of Injection and Monitoring Wells
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Steps 3 through 9: Cost Estimation
Model Calculations
- Step 3: System Design
- Step 4: Capitol Construction
- Soluble Substrate Systems
- Slow-Release Substrate Systems
- Step 5: Operations and Maintenance
- Soluble Substrate Systems
- Slow-Release Substrate Systems
- Step 6: Substrate Requirements
- Step 7: Performance Monitoring
- Step 8: Reporting
- Step 9: Project Management, Markups, Fees, & Contingency
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Step 10: Model Summary Report
Model Output
- Calculated Cost for Each Model Step
- Total Estimated Life-Cycle Cost
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| Steps in the Cost Estimating Process |
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Applicable Contaminants
The cost estimating tool is designed to calculate order-of-magnitude cost estimates for enhanced anaerobic bioremediation of chlorinated solvents, including chloroethenes, chloroethanes, and chloromethanes. Enhanced anaerobic bioremediation may also be applicable to other compounds subject to anaerobic degradation reactions. These compounds may include chlorobenzenes, chlorinated pesticides (e.g., chlordane), polychlorinated biphenyls (PCBs), chlorinated cyclic hydrocarbons (e.g., pentachlorophenol), oxidizers such as perchlorate, explosive and ordnance compounds, dissolved metals (e.g., hexavalent chromium), nitrate, and sulfate. The user may in some cases use this cost estimating tool for contaminants other than chlorinated solvents by providing alternate information for model input fields. However, this cost estimating tool is primarily intended to develop life-cycle cost estimates for enhanced bioremediation of chlorinated solvents.
User Assumptions
The user of this cost estimating tool should have a basic understanding of the principles and practices of enhanced anaerobic bioremediation. The reader is referred to the following references for information regarding the application of enhanced anaerobic bioremediation.
This cost estimating tool requires the user to provide model input parameters for basic site conditions, including contaminant distribution, hydrogeology, and groundwater geochemistry. The tool uses practical default values to determine reasonable cost estimates in order to simplify the process. The user has the option to override the default values in order to tailor the model to specified conditions.
Model Summary Report
A model summary report provides the estimated life-cycle cost of an enhanced anaerobic bioremediation system developed from model defaults, user input, and selected options. This program is not intended for design purposes. The life-cycle cost produced should be considered an order-of-magnitude estimate only. The variability associated with system design, construction, and monitoring for enhanced anaerobic bioremediation applications is high. Costs are calculated using current dollars, and a total present worth cost is calculated using a discount rate that accounts for inflation and the cost of money (investment potential).
Files for Download
- Complete download package (zip file) for Cost Estimating Tool for Enhanced Anaerobic Bioremediation of Chlorinated Solvents. Note: With some browsers this file must be renamed to "CostEst.zip")
- Individual files for download:
Other Files Available for Download
Additional information, work plans, guidance documents, presentations, cost and performance reports, etc., can be found on the AFCEE Enhanced Bioremediation Resources web page.
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