High pressure water jetting was evaluated as a surface preparation tool for bridge maintenance painting. The tests were conducted on the John F. Kennedy Bridge, which has lead containing existing paint system. The primary concerns were the surface preparation and the lead levels of the wastewater. Test areas were washed at 10,000 psi, 15,000 psi, and 20,000 psi and wastewater was collected for analysis. Lead tests were conducted on unfiltered wastewater and wastewater filtered through a variety of filter fabrics. High-pressure water jetting produces and excellent surface for painting but, on bridges with existing lead paint, the wastewater lead levels are too high for conventional KyDOH filtering requirements.

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The contents of this report reflect the views of the authors, who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views or the policies of the University of Kentucky, nor the Federal Highway Administration. This report does not constitute a standard, specification, or regulation.