Layer: Leader line-Wasatch Formation (ID: 163)

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Name: Leader line-Wasatch Formation

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Description: There were 2,433 water wells (permitted as completed in the DWR database) in Mesa County as of November 14, 2016. Each well was assigned to a hydrogeologic unit. Due to various sources of uncertainty, hydrogeologic unit designations were assigned a confidence level value of 1, 2, 3, or 4 with 4 representing the least confidence, based on the factors of uncertainty. A value of 4 was only used if there was very little to no data available for the given well.A Mesa County groundwater quality database was compiled from publically available databases or reports. The primary data source was the Water Quality Portal (WQP) from the National Water Quality Monitoring Council website. Additional data sources included the Colorado Department of Agriculture website and five United States Geological Survey (USGS) reports having data in Mesa County not found within the WQP. Within these USGS reports, the additional data was sourced from the City of Grand Junction, the Colorado Department of Agriculture, the Colorado Oil and Gas Conservation Commission, EnCana Oil & Gas (USA) Inc., and the USGS. These included data from as far back as 1946.A total of 365 sample sites had water quality data through 2017. Maximum detected concentrations were used for locations sampled more than once. Water quality in sampled Mesa County wells is variable and dependent on local geology, geography, and seasonal influences. It is emphasized that the existing database spans a time period of multiple decades and the data do not represent a synoptic view of water quality conditions. The water quality database was evaluated for water type in each of the hydrogeologic units. Cations (sodium, potassium, calcium, and magnesium) and anions (chloride, bicarbonate, carbonate, and sulfate) data were used to generate Stiff diagrams and/or pie charts. The pie charts were generated using concentrations in mg/L and, because of use of maximum values and other data variability, are not necessarily balanced. All of the pie charts were scaled in size relative to the total dissolved solids (TDS) concentration, with larger pies having higher measured TDS. Water quality was evaluated against EPA/Colorado drinking water standards.

Copyright Text: Water well information was derived primarily from the Colorado Division of Water Resources (DWR) database. Groundwater quality data in Mesa County was derived primarily from the Water Quality Portal (WQP) in the National Water Quality Monitoring Council website. CGS staff for the water well location and/or water quality components included Lesley A. Sebol, Katheryne H. McGee, and Erin P. Johnson.

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