Dewatering systems, well-point

Where LNAPL is situated at shallow depth (<20 ft or 6 m), in moderate to high permeability soil (> 10 s cm/s), a well-point system may be the appropriate recovery technology. The use of well points for LNAPL recovery is similar to construction dewatering. A major advantage to this type of system is that it is possible to lower... 

The design of a well-point system for remediation is similar to that of a dewatering system, with a few notable exceptions relating to the nature of the product to be recovered. Prior to the design effort, a hydrogeologic investigation is necessary to assess ... 

The double-diaphragm suction-lift pump LNAPL recovery system is patterned after the concept of a shallow well-point dewatering system commonly used in the con-... 

Soil Vapor Extraction System. Once the air is injected into the saturated subsurface, it wiU migrate toward the surface due to the effect of buoyancy. Eventually the contaminated injected air will enter the vadose zone. At this point, a sou vapor extraction (SVE) system may be implemented. Soil vapor extraction applies a vacuum to the vadose zone to assist in collecting vapors. The vacuum will help vapor collection as well as assist in preventing unwanted off-site migration. Equipment used in a soil vapor extraction system is similar to that used in an air sparging system, except that a vacuum pump is used instead of an air compressor. Additionally, if the vapors being collected by the soil vapor extraction system are moist, a dewatering system may be employed (Johnson et al., 1993). 

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