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Layer: Precambrian metamorphic wells (low conf.) (ID: 70)

Parent Layer: Precambrian

Name: Precambrian metamorphic wells (low conf.)

Display Field: wellname

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: There were 3,355 water wells (permitted as completed in the DWR database) in Chaffee County as of February 9, 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, or 3, with 3 representing the least confidence, based on the factors of uncertainty.A Chaffee 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 National Uranium Resource Evaluation (NURE) database; geothermal-related sample data from Dr. Paul Morgan of CGS (unpublished); Dr. Timothy Gates, Professor, Colorado State University (via email in August 2016); and N. Jordan Dimick thesis, Colorado School of Mines (unpublished).A total of 130 well and 36 spring sample sites had water quality data. Maximum detected concentrations were used for locations sampled more than once. Water quality in sampled Chaffee County wells and springs 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 database. The compiled groundwater quality data from wells and springs in Chaffee County was derived primarily from the Water Quality Portal (WQP) in the National Water Quality Monitoring Council website, but also was hand entered into a CGS database from publications not in the WQP. CGS staff for the water well location and/or water quality components included Erin P. Johnson and Lesley A. Sebol.

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