Abstract
The capabilities of a “universal platform” for the deployment of analyticalsensors in the field for long-term monitoring of environmental contaminants were expandedin this investigation. The platform was previously used to monitor trichloroethene inmonitoring wells and at groundwater treatment systems (1,2). The platform was interfacedwith chromium (VI) and conductivity analytical systems to monitor shallow wells installedadjacent to the Columbia River at the 100-D Area of the Hanford Site, Washington. Agroundwater plume of hexavalent chromium is discharging into the Columbia River throughthe gravels beds used by spawning salmon. The sampling/analytical platform was deployedfor the purpose of collecting data on subsurface hexavalent chromium concentrations atmore frequent intervals than was possible with the previous sampling and analysis methodsemployed a the Site.
Highlights
The development of platforms to deploy of analytical systems in the field has not kept pace with development of the analytical sensors
The platform was designed in a “plug and play” configuration for several types of analytical systems including trichloroethene (TCE), carbon tetrachloride, volatile aromatics, hexavalent chromium and lead
The system was first deployed adjacent to the Columbia River on July 19, 2004
Summary
The development of platforms to deploy of analytical systems in the field has not kept pace with development of the analytical sensors. The platform was modified to monitor hexavalent chromium and conductivity from shallow groundwater wells (aquifer tubes) adjacent to the Columbia River at the 100-D Area of the Hanford Site, Washington [4]. Wells 2 inches and larger Up to four depths in a single well (Multi-Level Sampling) Low-flow sampling Low energy requirements (solar cells) Calibration and quality control Creating blank water (for cleaning and calibration) Three-point calibration curve Standard additions Mid-calibration checks Spikes and splits Analytical Accommodating many types of sensors (TCE, Cr(VI), aromatics) Operates of two sensor systems simultaneously with temperature and conductivity
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