Mr. McCall has an M.S. in Geology and is a licensed geologist (KS28). He has managed investigations using direct push technology for over 25 years. Mr. McCall joined Geoprobe in 1995 where he conducts applications research related to groundwater and environmental investigations. He is active in the ASTM D18 Subcommittee on direct push technology where he has assisted in development of several standards. Wes recently has been involved with application of the MiHPT system to evaluate performance of the system to delineate formation permeability and contaminant distribution. He is currently working on a project field testing the HPT-Groundwater Profiling system.
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Groundwater Quality, Heavy Metal and Radionuclide Profiling with the HPT-GWS System
The hydraulic profiling tool-groundwater sampler system allows the investigator to obtain electrical conductivity (EC) and pressure injection (HPT) logs as the multi-port probe is advanced into unconsolidated formations. The EC and HPT logs define lithology and guide the selection of depths where the probe is halted for collection of groundwater samples. HPT injection flow is stopped and a small down-hole pump or peristaltic pump is used to purge water through the ports to the surface for water quality monitoring in a flow cell. Samples for organic and inorganic analytes may be collected. HPT-GWS profiles were obtained across a study site in central Kansas. Samples for major element cations, selected anions, arsenic and uranium were obtained at targeted locations. Contrasting EC and HPT logs indicated that fresh water from storm water catch basins was recharging the upper portion of the alluvial aquifer while brine from the shale bedrock was impacting the base of the aquifer. Results for arsenic and uranium samples revealed that no impacts above action levels had occurred due to the surface recharge or brine infiltration. However, salt concentrations at the base of the aquifer were too high for use as a drinking water supply.