Screened Auger Sampling: The Technique and Two Case Studies |
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| Authors: | Theodore W Taylor Michael C Serafini |
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| Institution: | Ted Taylor received his B.A. degree in geology from Colby College, and his M.S. degree in geology from Lehigh University. He is a consulting geologist/hydrologist with E.C. Jordan Co. (P. O. Box 7050, Portland, ME 04112), where he has worked extensively on the assessment of chemical contamination in sediment and bedrock aquifers.;Mike Serafini received his B.S. degree in geology from Michigan State University. He is a senior geologist for Keck Consulting Services (1099 W. Grand River Ave., Williamston, MI 48895),where he organizes and implements field drilling services and assesses hydrogeologic and contaminant conditions for remedial investigations. |
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| Abstract: | The screened auger is a laser-slotted, hollow-stem auger through which a representative sample of ground water is pumped from an aquifer and tested for water-quality parameters by appropriate field-screening methods. Screened auger sampling can be applied to ground water quality remedial investigations, providing:(1) a mechanism for determining a monitoring well's optimal screen placement in a contaminant plume; and (2) data to define the three-dimensional configuration of the contaminant plume.
Screened auger sampling has provided an efficient method for investigating hexavalent chromium and volatile organic compound contamination in two sandy aquifers in Cadillac, Michigan. The aquifers approach 200 feet in thickness and more than 1 square mile in area. A series of screened auger borings and monitoring wells was installed, and ground water was collected at 10-foot intervals as the boreholes were advanced to define the horizontal and vertical distribution of the contaminant plumes. The ability of the screened auger to obtain representative ground water samples was supported by the statistical comparison of field screening results and subsequent laboratory analysis of ground water from installed monitoring wells. |
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