We thank acoustical technicians, Ric Hupalo, Skip Ambrose, Dave Schirokauer, Ericka Pilcher, Charlotte Formichella, Dave Stack, Katherine Warner, Daniel Mennitt, Jessica Briggs, and Cecilia Leumas for the many field and office hours they spent collecting and analyzing the data in this report. We also greatly appreciate the assistance provided by park personnel in data collection efforts. Thanks to Kirk Sherrill and David Hollema from the Natural Resource Stewardship and Science (NRSS) Inventory and Monitoring Program for GIS assistance. We also thank technicians at Wyle Laboratory for the role they played in data collection, and our partner agency, the Volpe National Transportation Systems Center, for data collection assistance, as well as monitoring and analysis protocol development.