The Hydropunch™: An In Situ Sampling Tool for Collecting Ground Water from Unconsolidated Sediments |
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| Authors: | Russel W Edge Kent Cordry |
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| Institution: | Kent Cordry is currently manager of northern California GeoStore operations and staff hydrogeologist for the Longyear Co. During the development and testing of the Hydropunch, Cordry was employed by James M. Montgomery Consulting Engineers Inc. in Walnut Creek, California, as a senior hydrogeologist. While at Montgomery, Cordry was responsible for the design and management of hydrogeologic field investigations. He has 10 years of experience in the design and installation of ground water monitoring and vadose zone sampling systems, working both as a consultant and as a contractor. He holds a B.S. degree in geology and is a certified professional geologist with the American Institute of Professional Geologists.;Russel W. Edge is currently a hydrogeologist for Roy F. Weston Inc. in Albuquerque, New Mexico. Edge has used the Hydropunch in a number of studies in various industrial settings in the Gulf Coast region and in southern California. He is responsible for designing and implementing hydrogeologic field investigations, data interpretation, report preparation, and regulatory interfacing. He holds a B.S. degree in geology from West Texas State University and has completed graduate course work at Oklahoma State University. He is a member of the National Water Well Association and the New Mexico Hazardous Waste Society. |
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| Abstract: | The Hydropunch? is a stainless steel and Teflon® sampling tool that is capable of collecting a representative ground water sample without requiring the installation of a ground water monitoring well. To collect a sample, the Hydropunch (Patent #4669554) is connected to a small-diameter drive pipe and either driven or pushed hydraulically to the desired sampling depth. As the tool is advanced, it remains in the closed position, which prevents soil or water from entering the Hydropunch. Once the desired sampling depth is obtained, the tool is opened to the aquifer by pulling up the drive pipe approximately 1.5 feet (0.46m). In the open position, ground water can flow freely into the sample chamber of the tool. When the sample chamber is full, the Hydropunch is pulled to the surface. As the tool is retracted, check valves close and trap the ground water in the sample chamber. At the surface the sample is transferred from the Hydropunch to an appropriate sample container. The tool is a fast, inexpensive alternative for collecting ground water samples from a discrete interval. It is excellent for vertical profiling or defining the areal extent of a contaminant plume. |
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