Select Projects

Land Cover Classification Modeling:  Performed imagery analysis to quantify differences in land cover among individual properties for an area consisting of several thousand parcels.  Analysis was performed in the context of evaluating the variability of exposure to chemicals in the environment.

Analysis to Identify the Types and Extents of Different Land Cover Types to Support a Conceptual Site Model:  Conducted a land cover analysis based on historical and contemporary aerial photographs, historical maps, and environmental investigations of the site to quantify the extent of impervious and pervious cover on the operational areas of the site through time.

Technical Evaluation to Determine Jurisdictional Status Under the Navigable Waters Protection Rule, Definition of “Waters of the United States” (WOTUS):  Applied a holistic, weight-of-evidence approach relying on historical and contemporary aerial photography; property surveys, design drawings, and field data; regulatory documents; and local, regional, and national GIS data to determine the jurisdictional status of several surface water features on and in the vicinity of the site.  The results of the analysis helped the landowners make decisions about the future use of their land.

Site Conditions Evaluation:  For a real estate development matter, evaluated site conditions, topography, and surface water features (e.g., wetlands, streams, ponds) and performed an assessment of the general overland flow patterns on and in the vicinity of the property.  Our findings helped the client perform due diligence prior to a property transaction.

Pre- and Post-development Site Conditions Expert Services:  Evaluated existing and historical hydrology and land use/land cover of a property.  Reviewed and analyzed historical aerial photographs and topographic information to evaluate the landform and land cover changes that occurred on and in the vicinity of a site from the 1930s to the early 2000s.  Opined on changes in site conditions in the context of WOTUS and the significant nexus test, as defined under the Clean Water Act.

Development of a GIS database and WebGIS application to Evaluate and Visualize Environmental Data:  Constructed a comprehensive GIS database comprised of locations of facilities and other regulated sites from national and statewide data repositories to support large-scale research efforts to identify potential sources of contamination.  The GIS was used to create dynamic visuals and web-based mapping applications to allow collaboration between project team members and to help analyze data accurately and efficiently on a local and national scale.

Selected Publications

Mayo, MJ; Rice, JW; Zhao, S. 2023. “Digitizing the Haystack: Streamlined Techniques to Pinpoint PRPs.” Presented at the Battelle Sediments Conference, Austin, TX, January 12.

Mayo, MJ; Slagowski, NL. 2022. “Environmental Justice and the MGP Community Programs and Screening Tools.” Presented at the MGP Conference, Chicago, IL, September 29.

Mayo, MJ; Marsh, CM. 2019. “Assessing Exposure Using an Image-based Land Cover Classification Model.” Presented at the Society for Risk Analysis Annual Meeting, Arlington, VA, December 11.

Handler, JI; Gutierrez, SR; Mayo, MJ; Pollock, MC.  2018. “GIS for environmental litigation.” Bloomberg Environmental and Energy News.

Mayo, MJ; Ikeda, S; Briggs, N; Petito Boyce, C; Mayfield, D.  2017. “Using GIS Data and Tools to Assess the Vulnerability of Industrial Facilities and Natural Resources to Flooding Events.” Presented at the Society for Risk Analysis (SRA) Annual Meeting, Arlington, VA, 21p.

Mayo, MJ; Ikeda, S.  2016. “Positional Uncertainty in Imagery Analysis for Risk Assessment.” Presented at the Society for Risk Analysis (SRA) Annual Meeting, San Diego, CA, 14p.