Downhole volatile organic compounds trap for improved sampling of volatile organic compounds using cone penetrometer testing techniques
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United States of America Patent
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-
Dec 24, 1996
Grant Date -
N/A
app pub date -
Oct 11, 1995
filing date -
Oct 11, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Three separate volatile organic compound (VOC) traps are installed in a housing driven into the earth using cone penetometer testing (CPT) techniques. The traps are valved so that each trap is filled at a different depth. Operation of the unit is done by installing three fresh clean traps into a cone module. The unit is pushed to the desired depth using CPT techniques. One of the three traps is selected using an electronic switch in a truck located above the collection site to control a valving arrangement for direction of VOCs to a selected trap. Heaters are turned on to heat the surrounding soil to increase removal of volatiles from the soil or water at the sample collection point. The heaters are formed of nickel-chromium wires wrapped around an insulated section of the CPT push rod. The wire is protected during the penetration process by a stainless steel sleeve that threads over the wire wrapped section. Electricity through the wire will heat the wire to approximately 200.degree. Celsius which will then heat the surrounding soil. The VOC trap collects the volatiles downhole thereby eliminating any possibility of volatilization during the recovery and testing process.
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