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CLEARWATER GROUP Air Sparging, Soil Vapor Extraction, and Combined Air Sparging/Soil Vapor Extraction Pilot Tests Field Procedures Air Sparging Pilot Test The air sparging test will be performed by applying air pressure to the spargmg well The flow of air from the sparge well will be monitored to determine it's extent and effect on the surrounding formation and ground water The test will be performed at different levels of applied air pressure The applied air pressure will be changed when the pressure influence in surrounding wells stabilizes The initial applied air pressure will be 10 psig The applied air pressure will not exceed 45 psig, the PVC pressure limit The infected air pressure will not exceed 45 psi to provide a safety factor to prevent rupture of the well screen,and the flowrate will not exceed 60 cfm Air pressure will be applied to the spargmg well using a towable,engine-driven air compressor The compressed air will be filtered to remove any water,particles,and compressor oil All above ground air pressurized piping will be metal or hose suitable to the application No plastic pipe will be used Prior to begmnmg the test,the following measurements will be made at the surrounding observation wells • Depth to water will be measured to the nearest 0 01 foot with a Solinst electronic interface probe, or equivalent • Dissolved oxygen(DO)content of the well water will be measured • Hydrocarbon concentration in the air just above the water level in the observation wells will be measured with a flame ionization detector or a photo-ionization detector The test will be run in steps, each step at a different infected air pressure During each step, the following parameters will be measured to monitor the surrounding formation and determine when flow through the formation has stabilized • The induced pressure on the surrounding wells will be measured by Magnehelic®gauges in inches of water • The injected air flowrate will be measured with a Kurz®Model 443 thermal anemometer, or equivalent Once the formation has stabilized,pressures will be increased and the next test step will begin After the final step test, the depth to water, dissolved oxygen content in the well water, and the oxygen and volatile content of the air above the water in each observation well will be measured using the same instruments as above Soil Vapor Extraction Pilot Test Prior to performing the test,any necessary air permits shall be obtained and the test will be performed in accordance with any requirements stated in the permit The test will be performed by applying a vacuum to an existing vapor monitoring or extraction well or a soil vapor probe with a vacuum pump to extract soil vapor The test will be rain at different applied vacuums until the vacuum influence in surrounding wells or points has stabilized, or one pore volume has been extracted from the soil The following measurements will be made during the test for the different applied vacuums • Vacuum applied to the well will be measured with a vacuum gauge and adjusted with a bleeder valve on the vacuum side of the pump • Volatiles and oxygen content from the extraction well will be monitored during the test using a flame ionization detector or a photolonizatton detector • The vacuum influence in surrounding wells will be measured in inches of water(vacuum)with Magnehelic® 0 gauges,or equivalent CLEARWATER GROUP 1 REVISED June 29, 2001