Tracing Demo 1: PFAS Downstream of Facilities
Demo Question: What are the downstream fish tissue and surface water results below Converted Paper Manufacturing Facilities in Maine?
Use Case Area: Trace Contamination Pathways
This demo shows how SAWGraph can connect facility types, hydrologic flow paths, downstream waterbodies, sampling locations, and PFAS test results. It demonstrates how linked data can support tracing questions across facilities, water systems, and environmental samples.
What This Demo Connects
Facilities and Industries
Converted paper manufacturing facilities identified through industry classifications represented in SAWGraph.
Hydrology and Spatial Relationships
S2 cells, stream reaches, and downstream hydrologic connections used to trace pathways from facility locations through the surface water network.
Samples and PFAS Results
Surface water and fish tissue sampling locations together with PFAS measurements associated with downstream areas.
Demo Results
The map shows facilities, hydrologic features, downstream pathways, and environmental sample results returned from the SAWGraph queries based on the datasets currently represented in the graph. Results therefore reflect the scope and version of those datasets, as well as the conditions of the queries.
In the Maine data represented in this demo, repeated surface water and fish tissue testing is concentrated along the Kennebec River. The mapped results illustrate how PFAS measurements can be examined along a downstream pathway. A downstream relationship does not by itself establish that a selected facility released PFAS or caused a downstream measurement; multiple sources may contribute to contamination within the same river system.
The map is interactive. Pan and zoom to explore the results, use the layer control to show or hide different types of features, and explore mapped features for additional information.
Downstream Facilities, Flow Paths, and Samples
The workflow begins with converted paper manufacturing facilities and identifies hydrologic flow paths associated with their locations. It then follows connected reaches downstream and retrieves PFAS sample results associated with downstream areas.
Available layers include facilities, stream reaches, downstream reaches, surface water samples, skinless fish samples, skin-on fish samples, and S2 cells used in the spatial relationships.
Code and Query Resources
View the notebook used to run the queries and generate the interactive map.