TREW™

Dakota Technologies, Inc. is currently developing an innovative subsurface passive sampling system that addresses the current limitations of conventional monitoring wells. The patented Twin Reservoir Equilibrated Water (TREW™) sampler is designed for collection of both volatile and semi-volatile organic compounds from the vadose and saturated zones, using either conventional or direct push deployment techniques.  

Since there is no bulk flow through the membrane, TREW samplers offer an ideal technique with minimal disruption of the groundwater. Furthermore, since the equilibrated samples are dispensed directly from the reservoir into their storage containers very little contact with air occurs. This greatly reduces the amount of volatiles lost and enhances the quality of the sample. Additionally, since there is no purging required and the sample collection and recharge of the TREW sampler occurs simultaneously, considerable time savings can be realized. Finally, sample collection and recharge can be accomplished with a simple handheld syringe apparatus so no expensive specialty equipment is needed.