In 2009 the California Department of Transportation (Caltrans) published Technical Guidance for Assessment and Mitigation of Hydroacoustic Effects of Pile Driving on Fish (1). The purpose of the technical manual is to provide Caltrans engineers and biologists, and consultants with guidance related to the environmental permitting of pile driving projects in or near water. Appendix I - Compendium of Pile Driving Sound Data provides a summary of measured underwater sound levels for a variety of pile driving situations. The Compendium originally summarized and reported data from 36 projects between years 2000 - 2006. The Compendium was updated in 2012 with addition of 21 projects and updated again in 2014 with the addition of new data from 12 projects. The projects added in 2012 and 2014 included various types of pile driving for coastal and river bridges, harbors and wharfs, additional construction of the San Francisco - Oakland Bay Bridge, and a major structure over water being built for the US Navy. This paper highlights several interesting projects and updates analyses of the data base.
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