HAZCO is capable of designing and constructing funnel & gate systems. A funnel and gate system is a passive remediation method which utilizes cutoff walls (the funnel) to modify flow patterns so that ground water flows primarily through high conductivity gaps (the gates). The non-permeable funnel serves to lead the contaminated groundwater to the highly permeable gate which contains a reactive agent (e.g., iron granules).

The reactive agent and the design of these systems vary depending on site specific conditions and contaminants of concern.