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' GcoingicaCTechnics Inc. • • Page 4 <br /> Feasibility Study Work Plan <br /> ' Project No.425.2 <br /> August 17,2000 <br /> ' 2. Depth to water needs to be greater then 5-feet. <br /> ' • Technology Overview Report <br /> • Air Sparging, 1996, Ralinda Miller, Ground-Water Remediation Technologies <br /> Analysis Center <br /> ' • Air Sparging for Site Remediation, 1994, Robert E. Hinchee <br /> ' 3. The top of the screened interval of the sparg wells must be placed below the contaminant <br /> plume, generally 5 to 15 feet below the deepest contamination. <br /> • Groundwater Pollution Control Program Guideline 96, 1998, Wyoming Department <br /> ' of Environmental Quality Water Quality Division. <br /> 4. Saturated thickness of the contaminated aquifer should be greater then 5-feet and less <br /> then 20 to 30-feet. <br /> ' • Groundwater Pollution Control Program Guideline 46, 1998, Wyoming Department <br /> of Environmental Quality Water Quality Division <br /> • Air Spargingfor Site Remediation, 1994, Robert E. Hinchee <br /> ' 2.2.2 Site Specific Concerns <br /> Based on the air sparging system requirements mentioned above and other information <br /> ' obtained from the literature, the following list of site-specific concerns has been obtained. <br /> 1. Sparging has been shown to mound groundwater up to 90 cm. Vapor Extraction will also <br /> ' tend to mound the groundwater. Given the thickness of the capillary fringe in these fine- <br /> grained sediments, if the groundwater were to rise 2 or 3 feet at the site, the vapor <br /> extraction trench wells would become flooded. <br /> • Air Sparging for Site Remediation, 1994, Robert E. Hinchee <br /> 2. Vapor extraction in fine-grained soils have very limited zone of influence. The silty soils <br /> at the site will have permeability around 6x10-4cm/sec, or lower. This is typical for <br /> silty/clayey fine-grained sediment. Vapor extraction become very ineffective in soil of <br /> this nature. <br /> ' • Groundwater, 1979, R. Allen Freeze & John A Cherry <br /> 3. Subsurface utility trenches will cause loss of control of vapor recovery by the vapor <br /> ' extraction and air sparging system. A fiber optic utility trench runs along the entire north <br /> side of the remedial area. A septic system is in place in the vicinity of MW-8. <br /> • Technology Overview Report, Air Sparging, 1996,Ralinda Miller <br /> ' • Ground-Water Remediation Technologies Analysis Center <br /> • Groundwater Pollution Control Program Guideline 46, 1998, Wyoming Department <br /> ' of Environmental Quality Water Quality Division <br />