Hydraulic ram pumps and Sling Pumps

Profile -- Cable Tool Drilling, 9/18/94This method is much like pile driving in that a drill casing is driven into the soil by the cable tool rig. Thesoil goes up the inside of the casing and can be collected in a split spoon sampler or core barrel. Samplequality using this technique is far superior to that of the hard tooling method because no water is added tothe borehole.When the core barrel is removed, it can be easily contained using plastic sleeves taped over both ends.The core barrel is then knocked with a hammer so that the soil drops into the plastic sleeve. When thebarrel is empty the sleeve can be closed and placed in a drum if the soil is suspected to be contaminated.Thus public and worker exposure to contaminants is minimized.This technique does not use any fluid to soften the formation or remove drill cuttings. It is a completelydry method, which prevents the spreading of contamination and improves sample quality.The drive barrel technique is best used in relatively dry, unconsolidated soils such as the sands andgravels often found in the unsaturated zone (the soil above the water table) of the Hanford formation. AtHanford, hard tooling must be used below the water table, in areas where unsaturated zone soils becomeconsolidated, or in areas where there are large bouldersWhere (in-situ/ex-situ): This technology operates in situMedia: This technology is used in the vadose zone and groundwaterTargeted Contaminants: Drilling is required for retrieval and treatment of chemical and radioactive wasteat Hanford.What is the status of the technology's development?This is a baseline technologySummary of technology advantages:Not applicable to a baseline technologySummary of technology limitations:Not applicable to a baseline technologyMajor technical challenges for the technology:The major technical challenge of cable tool drilling is its slow penetration rate. Its slowness limits the usehttp://www.drilshop.com/holes/cabtool.html (4 of 13) [1/13/2005 12:48:35 PM]