Selection of Sampling Pumps Used for Groundwater Monitoring at the Hanford Site

Abstract

SummaryThe variable frequency drive centrifugal submersible pump, Redi-Flo2 made by Grundfos, was selected for universal application for Hanford Site groundwater monitoring. Specifications for the selected pump and five other pumps were evaluated against current and future Hanford groundwater monitoring performance requirements, and the Redi-Flo2 was selected as the most versatile and applicable for the range of monitoring conditions. The Redi-Flo2 pump distinguished itself from the other pumps considered because of its wide range in output flow rate and its comparatively moderate maintenance and low capital costs. The Redi-Flo2 pump is able to purge a well at a high flow rate and then supply water for sampling at a low flow rate. Groundwater sampling using a low-volume-purging technique (e.g., low flow, minimal purge, no purge, or micropurge) is planned in the future, eliminating the need for the pump to supply a high-output flow rate. Under those conditions, the Well Wizard bladder pump, manufactured by QED Environmental Systems, Inc., may be the preferred pump because of the lower capital cost.v

Development of Site-Scale Conceptual Model Using Integrated Borehole Methods: Systematic Approach for Hydraulic and Geometric Evaluation

“…Vertical monitoring of temperature and electrical conductivity was conducted during a short-term pumping test. The pump used for the single-hole hydrogeophysical test is the variable frequency drive submersible pump, Rediflo2 (Grundfos), which is known to allow constant control of the flow rate by adjusting the frequency [37]. To effectively check the monitoring results within a short time, two pumps were placed at the lower part of the casing and the temperature and electrical conductivity of the fluid were monitored over the entire depth during constant pumping at a flow rate of 14~15 L/min (340 Hz).…”