Comparisons (Specifications) CalClean Standard S.V.E. Pump & Treat Truck-Mounted Mobile Systems Fixed Based Systems (Few Mobile Systems) Fixed Based Systems (Few Mobile Systems) High Capacity 450 CFM Systems Can Extract 5 to 50 GPM Water Typical System is 250 CFM But Cannot Extract Water Typical System is 2 to 20 GPM But Cannot Extract Vapors Can Extract & Destroy up to 130 pounds of Hydrocarbons per hour Typical System can Destroy up to 40 pounds of Hydrocarbons per hour Cannot Destroy Hydrocarbon Vapors Can Extract up to 29" Hg (394" H2O) i.e. Large Radius of Influence, Less Extraction Wells Required for Site Typically Extracts up to 10" Hg (136" H2O) i.e. Smaller Radius of Influence, More Wells Required, Greater Costs Not Applicable For Vapors Extract Vapor & Groundwater Extract Vapor Only Extract Groundwater Only Can Lower Groundwater Table to Address Vadose, Capillary Fringe & Saturated Zones Cannot Extract Groundwater Can Only Remove Groundwater, No Vapor Comparisons ($$) CalClean Standard S.V.E. Pump & Treat System Manned At All Times To Adjust Stinger Depths to Maximize Recovery System Unmanned, Cannot Adjust Depths in Extraction Wells System Unmanned, Cannot Adjust Depths In Extraction Wells No Capital Cost Outlay High Capital Cost High Capital Cost Closures Can Be Attained Earlier (possibly in less than 1 year) Closures Typically Take 3 to 10 Years Closures Typically Take 5 to 30 Years No Trenching Needed Trenching Required Trenching Required No Shutdown Of Station Shutdown Station for 2 to 4 Weeks - Loss of earnings Shutdown Station for 2 to 4 Weeks - Loss of earnings No Long Time Commitment Needed For Use At A Site Long Term Commitment is Needed Long Term Commitment is Needed No Cost Of Decommissioning High Cost Of Decommissioning And Loss Of Value Of System High Cost Of Decommissioning And Loss Of Value Of System Comparisons (misc.) CalClean Standard S.V.E. Pump & Treat Can Mobilize To A Site Within Hours Of Call. Can Attack Source Immediately Typically Takes 9 to 15 Months To Install System - Allows Plume Size To Increase Typically Takes 6 to 15 Months To Install System - Allows Plume Size To Increase Can Startup At A Site Quickly Takes Many Months Before Startup Takes Many Months Before Startup Can Pull Offsite When Concentrations Drop Off To Allow For Rebound Cannot Pull Offsite since fixed Cannot Pull Offsite since fixed Can Adjust Number Of Days Of Operation To Maximize Recovery Cannot Adjust Days Of Operation Cannot Adjust Days Of Operation Constant Onsite Monitoring Of Influent Vapor Concentrations No Onsite Monitoring Of Influent Vapor Concentrations Not Applicable Occupies Space At Station Only During Onsite Operation Occupies Full-Time Space On Small Station Property Occupies Full-Time Space On Small Station Property Low Noise Operation (Great For Residential Areas) High Noise Systems (Complaints From Neighbors) Low Noise

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