Distribution of Total Dissolved Solids in the Horseshoe Canyon / St. Mary River Hydrostratigraphic Unit (gridded data, ASCII format)

This grid represents the distribution of total dissolved solids (TDS) in the Horseshoe Canyon / St. Mary River hydrostratigraphic unit (HSU). It is a result of a geostatistical model which was constructed using publicly available water chemistry data from the following sources:

1. Alberta Environment and Parks' (AEP) Alberta Water Well Information Database (AWWID)  
2. Alberta Health Services (AHS)
3. Alberta Energy Research Institute (AERI)
4. Baseline Water Well Test Database (BWWT)
5. Data submissions by industry as required by Alberta Energy Regulator (AER) Directive 044: Requirements for Surveillance of Water Production in Hydrocarbon Wells Completed Above the Base of Groundwater Protection
6. Oil and gas well drillstem tests (DSTs) and production fluids. 

The TDS surface was mapped at a regional scale using many years of data, thus providing a good indication of regional water chemistry within the unit rather than site-specific values.