Walter Floyd is an Engineering Geologist (EG) in the Site Cleanup Program (SCP), Department of Defense (DoD) Unit. He has over 25 years of experience in the private sector conducting and managing environmental cleanup of soil and groundwater at private sites and DoD facilities. In the four plus years that Walter has worked in SCP he has taken on management and oversight of a wide variety of complex cleanup projects like the former Lime Kiln Site in Diamond Spring, and the privatization of numerous sites at McClellan Business Park.
Most noteworthy Walter has spear-headed the process of conducting several region-wide evaluations of emerging contaminants in the Central Valley, specifically for Hexavalent Chromium (CrVI), 1,2,3-Trichloropropane (1,2,3-TCP), and Perfluoroalkyl Substances (PFAS). To do these studies, Walter has been working with State Board staff, the Division of Drinking Water, and Regional Board staff to develop a GIS mapping tool that imports analytical data and presents it in a comprehensive way. Using this mapping tool, Walter has identified a significant number of new areas of groundwater contamination that will be addressed by the SCP team.
For example, Walter is using his GIS tool to evaluate non-point sources of 1,2,3-TCP using relative concentrations of 1,2,3-TCP detections and maps of 1,2,3-TCP detections, application areas, and pesticide manufacturers. These parameters aid in the development of correlations and associations that characterize, most importantly, the non-point sources. Due to 1,2,3-TCP's very low Maximum Contaminant Level of 5 parts per trillion, Walter's work is helping to fulfill a critical need of the Central Valley Water Board to better understand the 1,2,3-TCP region-wide groundwater distribution. In addition, Walter has collaborated with the U.S. Geological Survey (USGS) and co-authored a paper titled "Factors Affecting 1,2,3-TCP Contamination in Groundwater in California," dated 23 April 2019.
At the former McClellan Air Force Base, Walter has created another amazing GIS tool: an interactive map in Geotracker, showing all State Land Use Covenants (SLUCs) at McClellan Business Park (MBP). Walter has also added a direct link to the "SLUC PDF" to see the actual SLUC. Since there are hundreds of SLUCs at MBP, this tool creates a very simple and efficient way to review parcel specific information. In summary, Walter goes far above and beyond his EG duties to ensure that quality work is completed, and that human health and the environment are protected.