DESCRIPTION: The historic Francis Ermatinger House was originally constructed in 1845, with additions built in the late 1800s. The house was moved in 1910, and again in 1986 to its present location located in Oregon City, Oregon. It is on the National Register of Historic Places. Foundation settlement and structural distress required closing the house to the public. Foundation Engineering was retained by the City of Oregon City to evaluate the foundations and provide recommendations for repairs or replacement. Based on the project need, a full basement was selected as the preferred foundation option.
SERVICE: Foundation Engineering conducted a site investigation involving 3 borings to explore the subsurface conditions. The ground water elevation would be above the proposed basement floor during heavy rains. Therefore, Foundation Engineering developed options for a water tight basement and a sump pump dewatering system. We also developed recommendations for the earth pressure on the basement wall and a retaining wall for an external staircase. The proposed structural and foundation improvements will allow the house to be reopened to the public as a museum showcasing life in 19th century Oregon.