The federally and state threatened California tiger salamander (CTS; Ambystoma californiense) is a large salamander endemic to the San Joaquin-Sacramento River and coastal valleys of Central California. CTS require access to both aquatic and upland habitat throughout their life cycle. The upland habitat must contain subterranean refugia typically in the form of animal burrows [i.e., California ground squirrel (Spermophilus beecheyi) or valley pocket gopher (Thommomys bottae)] for foraging and shelter from predators and desiccation during nonbreeding periods. Take avoidance measures are required by state and/or federal agencies prior to the start of development projects that have the potential to impact upland habitat include amongst other measures: burrow excavation. Burrow excavation is costly, laborious, and requires extensive experience to perform. Excavation of burrows also includes a variety of inherent hazards to surveyors including exposure to the fungus coccidioidomycosis (i.e., Valley fever). In this presentation we will discuss a case study involving a multiyear burrow excavation dataset collected between 2018-2021 from a project involving a greenfield industrial development in the San Joaquin Valley.