ENVision Models


Cost Estimating Relationships (CERs)

CERs, or "Cost Models," are parameter-driven cost algorithms that calculate costs based on user input and are the foundation for building a parametric cost estimate. CERs are derived from a statistical analysis of historical project cost data and other validated sources and compiled into mathematical equations using our proprietary procedure.


The ENVision CER library is a collection of over 300 CERs used to estimate hundreds of ER activities and technologies defined in the Environmental Cost Element Structure (ECES). The CER library is organized by cleanup activity module. Where, a module is collection of related CERs assembled to form cost model representations for specific activities common to ER projects, such as Site Work. Below are some of the CERs in ENVision.


  • Access Roads Construction
  • Aeration
  • Aeration - Construction
  • Aeration - Operations
  • Air Stripping
  • Air Stripping - Construction
  • Air Stripping - Operations
  • Air-Gas Sample Collection
  • Asphalt-based Encapsulation (Ex-Situ)
  • Base-Catalyzed Decomposition Process
  • Base-Catalyzed Decomposition Process Construction
  • Base-Catalyzed Decomposition Process Operations
  • Biofiltration - Construction
  • Biopile
  • Biopile Construction
  • Biopile Operations
  • Catalytic Oxidation
  • Catalytic Oxidation - Construction
  • Catalytic Oxidation - Operations
  • Chemical Leaching
  • Chemical Leaching Construction
  • Chemical Leaching Operations
  • Chemical Oxidation
  • Chemical Oxidation - Construction
  • Chemical Oxidation - Operations
  • Clean, Remove, and Dispose UST
  • Cleanup-Landscaping
  • Cleanup-Landscaping Construction
  • Clearing & Grubbing
  • Clearing & Grubbing Construction
  • Communications Construction
  • Composting
  • Composting Construction
  • Composting Operations
  • Condensation
  • Condensation - Construction
  • Condensation - Operations
  • Confined Disposal Facility
  • Confined Disposal Facility Construction
  • Confined Disposal Facility Operations
  • Constructed Wetlands - Construction
  • Demobilization
  • Demobilization Construction
  • Disposal Load and Haul During Construction/Implementation
  • Disposal Load and Haul During Operations
  • Dredging
  • Drum Removal
  • Ecological Sample Collection
  • Electrical Overhead Construction
  • Excavation - Clean Earth Work
  • Excavation - Clean Earth Work.
  • Excavation of Contaminated Soil, Drums, or Pipes
  • Extraction Wells Installation and Startup
  • Extraction Wells Operations and Maintenance
  • Fencing Construction
  • Fencing Maintenance
  • Flaring - Construction
  • Glycolate Dehalogenation
  • Glycolate Dehalogenation Construction
  • Glycolate Dehalogenation Operations
  • Granular Activated Carbon
  • Granular Activated Carbon - Construction
  • Granular Activated Carbon - Liquids
  • Granular Activated Carbon - Liquids - Construction
  • Granular Activated Carbon - Liquids - Operations
  • Granular Activated Carbon - Operations
  • Groundwater Sample Collection
  • In Situ Chemical Oxidation (ISCO) - Application/Operations
  • In-Situ Enhanced Bioremediation - Application/Operations
  • Incineration
  • Incineration Construction
  • Incineration Operations
  • Injection Wells Installation and Startup
  • Injection Wells Operations and Maintenance
  • Internal Combustion Engines
  • Internal Combustion Engines - Construction
  • Internal Combustion Engines - Operations
  • Ion Exchange
  • Ion Exchange - Construction
  • Ion Exchange - Operations
  • Land Application
  • Land Application Construction
  • Land Application Operations
  • Land Tilling Construction
  • Land Use Controls (LUC) - Implementation
  • Load & Haul
  • Load & Haul Construction
  • MEC - Removal with On-site Treatment
  • MEC - Surface Scraping
  • MEC Site Preparation and Field Activities
  • Mechanical Excavation of Anomolies Greater than 3 Feet
  • Media Filtration
  • Media Filtration - Construction
  • Media Filtration - Operations
  • Mobilization
  • Mobilization Construction
  • Monitoring and/or Ancillary Wells
  • Parking Lots Construction
  • Phytoremediation
  • Phytoremediation Construction
  • Phytoremediation Operations
  • PL_Bio-Specimen Analysis
  • PL_CERCLA 5Yr Rev during RAO
  • PL_CERCLA 5Yr Review During LTMgt
  • PL_Construction Project Management
  • PL_Corrective Action Plan
  • PL_Disposal During Construction/Implementation
  • PL_Disposal During Operations
  • PL_Field Equipment/Resources
  • PL_Gasses, Oxygen Demand Analysis
  • PL_Geotechnical
  • PL_Groundwater Modeling
  • PL_Inorganic Compounds - (Metals, Explosives)
  • PL_Institutional Controls (IC)
  • PL_Ions - Individual Analysis
  • PL_IRA Phase 2 Studies
  • PL_IRA Phase 3 Remedial Design
  • PL_Land Use Control
  • PL_Legal Controls
  • PL_Long-Term Management Project Management
  • PL_LTMgt Plan Development
  • PL_LUC Corrective Action (Use LUC Plan Execution)
  • PL_LUC Document Review and Tracking
  • PL_Microbial
  • PL_Mobilization - Professional Labor
  • PL_Monitored Natural Attenuation (Geochemical)
  • PL_Operations-Maintenance Project Management
  • PL_Optimization Studies
  • PL_Organic Compounds (Air/Gas)
  • PL_Organic Compounds (GW/Liquids, Soil/Solids; During Construction)
  • PL_Organic Compounds (GW/Liquids, Soil/Solids; During Operations)
  • PL_Organic Compounds (GW/Liquids, Soil/Solids)
  • PL_Other - Surcharges, Mobile Lab
  • PL_Periodic Inspection of LUCs
  • PL_Phase 2 Studies - Professional Labor (FS or CMS)
  • PL_Phase 2 Studies - Professional Labor (RI or RFI)
  • PL_Phase-1 Studies
  • PL_Planning
  • PL_Project Management
  • PL_RACR
  • PL_RACR - Amendment
  • PL_Rapid Sediment Characterization (RSC) methods
  • PL_Remedial Action Operation Optimization Studies
  • PL_Remedial Design (Phase 3)
  • PL_Reporting
  • PL_Site Assessment
  • PL_Site Preparation
  • PL_Surveys and Studies
  • PL_Water Quality Indicators
  • Pozzolan Process (Ex-Situ Solidification)
  • Pozzolan Process (In-Situ Solidification)
  • Precipitation
  • Precipitation - Construction
  • Precipitation - Operations
  • Radiofrequency-Electromagnetic Heating - O_M Utilities
  • RCRA C-Low Permeability Caps
  • RCRA C-Low Permeability Caps Construction
  • RCRA C-Low Permeability Caps Long-Term Management
  • RCRA C-Low Permeability Caps Operations
  • RCRA D Cap
  • RCRA D Cap Construction
  • RCRA D Cap Long-Term Management
  • RCRA D Cap Operations
  • Reverse Osmosis
  • Reverse Osmosis - Construction
  • Reverse Osmosis - Operations
  • Rotating Biological Contactors
  • Rotating Biological Contactors - Construction
  • Rotating Biological Contactors - Operations
  • Sample Collection Mobilization
  • Sediment Capping Construction
  • Sediment Studies RI/FS
  • Sediments Sample Collection
  • Sheet Piling Construction
  • Sieving and Removal of Large Debris
  • Sieving and Removal of Large Debris Construction
  • Sieving and Removal of Large Debris Operations
  • Six Phase Heating and Extraction
  • Six Phase Heating and Extraction Construction
  • Six Phase Heating and Extraction Operations
  • Slurry Walls Construction
  • Slurry-Phase Bioreactor
  • Slurry-Phase Bioreactor Construction
  • Slurry-Phase Bioreactor Operations
  • Soil Cap
  • Soil Cap Construction
  • Soil Cap Long-Term Management
  • Soil Cap Operations
  • Soil Flushing - Application/Operations
  • Soil Sample Collection
  • Soil Vapor Extraction - Hot Air (Ex Situ)
  • Soil Vapor Extraction (Ex-Situ)
  • Soil Vapor Extraction (Ex-Situ) Construction
  • Soil Vapor Extraction (Ex-Situ) Operations
  • Soil Washing
  • Soil Washing Construction
  • Soil Washing Operations
  • Solids Dewatering-Drying
  • Solvent Extraction
  • Solvent Extraction Construction
  • Solvent Extraction Operations
  • Sprinkler Irrigation Construction
  • Surface Soil
  • Surface Water Sample Collection
  • Technology Infrastructure, Transportation, Survey, and Setup
  • Thermal Blanket
  • Thermal Blanket Construction
  • Thermal Blanket Operations
  • Thermal Desorption (Ex Situ)
  • Thermal Desorption (Ex Situ) Construction
  • Thermal Desorption (Ex Situ) Operations
  • Thermal Oxidation
  • Thermal Oxidation - Construction
  • Thermal Oxidation - Operations
  • Transportation, Survey, and Setup
  • Treatment Wall Construction
  • Ultraviolet (UV) Light Oxidation
  • Ultraviolet (UV) Light Oxidation - Construction
  • Ultraviolet (UV) Light Oxidation - Operations
  • Water Distribution Systems Construction
  • Water Distribution Systems Maintenance
  • Water Storage Tanks Construction
  • Well Abandonment - During Long-Term Management
  • Well Abandonment - During Phase 1 Studies
  • Well Abandonment - During Phase 2 Studies
  • Well Abandonment - Operations

Integrated Cost Estimating Relationships (ICERs)

ICERs are comprised of related CERs assembled to form cost model representations of entire cleanup phases. The ENVision ICER library is a collection of 49 ICERs used to estimate entire cleanup phases. Check out the featured ICERs below.


  • Air Sparging
  • Base-Catalyzed Decomposition Process
  • Biopile-Composting
  • Bioslurping
  • Bioventing
  • Capping
  • Chemical Leaching
  • Confined Disposal Facility
  • Corrective Action Plan
  • Draw-Down Pumping
  • Drum Removal
  • Ex Situ Soil Vapor Extraction
  • Ex Situ Soil Vapor Extraction - Hot Air (HAVE)
  • Ex Situ Solidification - Stabilization
  • Excavation with Off-Site Disposal
  • Glycolate Dehalogenation
  • Groundwater Monitoring
  • In Situ Chemical Oxidation (ISCO)
  • In Situ Heating High Temp
  • In Situ Heating Low Temp
  • In Situ Stabilization Solidification
  • In-Situ Enhanced Bioremediation
  • In-Well Air Stripping
  • Incineration
  • Land Application
  • Land Tilling
  • Long-Term Management
  • MEC Remedial Action
  • Monitored Natural Attenuation
  • Multi-Site CERCLA 5 Year Review
  • Phase 1 Studies
  • Phase 2 Studies
  • Physical Separation-Sieving
  • Phytoremediation
  • Pump and Treat
  • Sediment Capping
  • Sediment Remedial Investigation/Feasibility Studies
  • Site Assessment
  • Skimming
  • Slurry Phase Bioreactors - Rotating Biological Contactors
  • Soil Flushing
  • Soil Vapor Extraction In Situ
  • Soil Washing
  • Solvent Extraction
  • Tank Removal
  • Thermal Desorption
  • Treatment Wall
  • Two-Phase Extraction
  • Vertical Cut-Off Wall