PROJECT: Municipal Wellfield Siting and Permitting

Dayton and Lafayette, Oregon

GSI staff members conducted a detailed hydrogeologic evaluation and developed a conceptual hydrogeologic model using existing municipal and irrigation well data for the Cities of Dayton and Lafayette to identify a target aquifer for a new City wellfield. The well siting project involved studying the potential Troutdale Aquifer yields, distribution and nature of local poor groundwater quality zones, and potential interference with existing wells. GSI provided permitting assistance to obtain water rights and land use approval, and worked with the Oregon Water Resources Department and local farmers to prepare a groundwater management plan for the aquifer that will ensure that the aquifer is not over-pumped and that well interference is minimized. Recently, GSI assisted with the drilling and testing of two new production wells.